Hollow drill bars and rods, of steel

1. Scope and Applicability

This PCR covers gate-to-gate production of steel hollow drill bars and rods supplied as straight mill products suitable for rock-drilling or similar drill applications. The product may be alloy or non-alloy steel and may have a round, hexagonal, or other declared cross-section. The foreground boundary begins when declared solid steel feedstock and purchased utilities enter the hollow-drill-steel manufacturing plant and ends with one kilogram of conforming, unpackaged hollow drill bar or rod at the plant gate.

For classification control, a product claimed to meet the Chapter 72 hollow-drill-bar definition must be suitable for drills, have a greatest external cross-sectional dimension greater than 15 mm and not greater than 52 mm, and have a greatest internal dimension not greater than one half of the greatest external dimension. Products outside that geometry are not silently included.

Excluded are seamless or welded tubes and hollow profiles not meeting the hollow-drill-bar definition; oil- or gas-well casing, tubing, and drill pipe; finished drill assemblies, bits, couplings, shanks, and anchors; solid drill rods; upstream steelmaking; downstream use, maintenance, and end-of-life; and transport or packaging after the declared plant gate.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.basic-metals.hollow-drill-bars-and-rods-of-steel
classification_refs	CPC 3.0: 41273, exact classification context
covered_products	Straight hollow drill bars and rods of alloy or non-alloy steel, in the declared cross-section, dimensions, grade, heat-treatment state, length, and surface condition
excluded_products	Tubes and hollow profiles outside the Chapter 72 hollow-drill-bar definition; oil- and gas-well drill pipe, casing, or tubing; solid rods; assembled drill tools and anchoring systems
representative_product	Unpackaged steel hollow drill bar or rod conforming to the purchaser's declared dimensional and metallurgical specification
production_route	Received steel feedstock; reheating where used; hollow forming by the declared hot-working, extrusion, rolling, or drawing route; heat treatment where used; straightening, cutting, surface finishing, inspection, and release
market_state	Straight mill-length or cut-length bar/rod, unpackaged at the manufacturing plant gate; geometry, steel grade, heat treatment, length, surface condition, and inspection class declared

3. Reference Flow

Field	Value
What	Supply a conforming hollow steel bar or rod suitable for the declared drill application
How much	1 kg net mass of unpackaged conforming product at the manufacturing plant gate
How well	Meets the declared steel grade, cross-section, external and internal dimensions, heat-treatment state, straightness, length, surface condition, and inspection requirements
How long or cycle	One production lot through release at the plant gate; no use-life service is included
reference_flow_link	reference_hollow_drill_steel in process hollow_drill_steel_manufacturing

Field	Value
Reference amount	1 kg
Reference product flow	Hollow drill bars and rods, of steel f809f600-17ff-48b3-85da-01f93dbede3c
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	steel grade and alloy status; semi-finished feedstock form; forming route; cross-section shape; greatest external dimension; greatest internal dimension; finished length; heat-treatment state; surface condition or coating; inspection or conformity specification; plant geography; production period; packaging exclusion

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_net_mass	reference product and all mass-normalized exchanges	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Normalize to measured net mass of accepted hollow drill steel, excluding packaging, removable dunnage, mill scale, offcuts, and rejected product.
geometry_declaration	reference product identity	Length	mm	Record cross-section shape and greatest external and internal dimensions. When the Chapter 72 hollow-drill-bar definition is claimed, verify external dimension > 15 mm and <= 52 mm and internal dimension <= one half of the external dimension.
energy_conversion	purchased electricity	Energy	MJ	Preserve the metered unit in raw data and convert kWh to MJ only by multiplying by 3.6; disclose voltage level, supply geography, and grid or contractual electricity identity.
gas_reference_conditions	natural gas and industrial oxygen	Volume 93a60a56-a3c8-22da-a746-0800200c9a66	m3	Record meter reference temperature, pressure, gas purity or composition, and whether the volume is standard, normal, or actual; do not compare or aggregate volumes at different reference conditions without conversion.
wastewater_mass_conversion	wastewater sent to treatment	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	When wastewater is metered by volume, calculate mass only from the measured volume and a recorded measured or technically justified density for the same stream and period.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased solid alloy-steel or non-alloy-steel primary/semi-finished feedstock at the first controlled manufacturing gate, with grade, form, mass, supplier, and upstream dataset declared
starting_condition_role	External product input to gate-to-gate hollow-drill-steel manufacture; upstream steelmaking is represented by linked supplier or secondary datasets, not recreated in this foreground process
product_classification_scope	Steel hollow drill bars and rods conforming to the declared CPC 41273 product boundary; Chapter 72 geometry is applied when that classification claim is used
recursive_input_rule	If a purchased input is already a hollow drill bar or rod of this category, record it as the same reference product flow, stop category recursion at that exchange, and disclose its quantity, state, supplier, and upstream dataset
upstream_dataset_requirement	Use geographically, technologically, temporally, and product-state representative datasets for steel feedstock, electricity, natural gas, industrial oxygen, process water, and any external waste treatment or recovery
disclosure	Declare plant geography and period; alloy status and grade; feedstock form; forming and heating route; heat treatment; cross-section and dimensions; yield and reject disposition; water-loop boundary; electricity identity; fuel and oxygen reference conditions; abatement systems; wastewater destination; and whether packaging or transport has been excluded

rule_id	Applies to	Rule	source_ids
boundary_gate_to_gate	all foreground modelling	Include all controlled operations from receipt of declared steel feedstock through heating, hollow forming, heat treatment where used, straightening, cutting, finishing, inspection, and release of conforming unpackaged product.	eu-ferrous-metals-bat-2022
boundary_utility_and_emissions	energy, water, residues, wastewater, and direct emissions	Include purchased energy and water, direct fuel and oxygen use, metallic scrap, mill scale, wastewater crossing the gate, and measured or calculated direct air emissions attributable to the included operations.	eu-ferrous-metals-bat-2022
boundary_exclusions	upstream and downstream stages	Represent upstream steelmaking and purchased supplies with linked datasets; exclude downstream distribution, packaging outside the declared product, use, maintenance, and end-of-life.	un-cpc-3-0-structure-2025; eu-cn-2020-1577-ch72-note-1p

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
hollow_drill_steel_manufacturing	Hollow drill steel forming and finishing	required	Always include the controlled gate-to-gate operations actually used; mark conditionally absent atomic exchanges as not applicable only with evidence	Foreground manufacturing from declared steel feedstock through released hollow drill bar or rod	1 kg net conforming unpackaged product at plant gate

Process: Hollow drill steel forming and finishing (hollow_drill_steel_manufacturing)

Inputs

Product flows

Alloy-steel feedstock (alloy_steel_feedstock)

Record this exchange only for the alloy-steel route. It is the measured mass of the declared alloy-steel primary or semi-finished form entering the controlled process.

• Selected flow: Alloy steel 4f2d85d4-e6ed-4f74-8063-492513b93cde
• Flow property / unit: Mass / kg
• Amount rule: Sum accepted alloy-steel feedstock mass charged to the production lot and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_material_mass_balance
• Sources: eu-ferrous-metals-bat-2022

Non-alloy-steel feedstock (non_alloy_steel_feedstock)

Record this exchange only for the non-alloy-steel route. It is one concrete solid feedstock exchange whose grade and semi-finished form must be declared; its exact Tiangong UUID remains unresolved.

• Selected flow: Non-alloy steel semi-finished feedstock
• Flow property / unit: Mass / kg
• Amount rule: Sum accepted non-alloy-steel feedstock mass charged to the production lot and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_material_mass_balance
• Sources: eu-ferrous-metals-bat-2022

Purchased electricity (purchased_electricity)

Record the purchased alternating-current electricity crossing the plant boundary for drives, forming, heat treatment, finishing, water systems, and abatement. Select the exact voltage, geography, and supply technology in the foreground dataset before publication.

• Selected flow: Purchased alternating-current electricity
• Flow property / unit: Energy / MJ
• Amount rule: Sum allocated meter readings for the included operations, convert to MJ where required, and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_and_gas_balance
• Sources: eu-ferrous-metals-bat-2022

Natural gas for feedstock heating (natural_gas_for_heating)

Record gaseous natural gas only when it is purchased and consumed in included reheating, intermediate-heating, or heat-treatment equipment.

• Selected flow: natural gas in the gaseous state 4f19ca0e-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Volume / m3
• Amount rule: Sum corrected meter volume attributable to the lot and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_and_gas_balance
• Sources: eu-ferrous-metals-bat-2022

Industrial oxygen for oxy-fuel combustion (industrial_oxygen_for_oxyfuel)

Record purchased industrial oxygen only when oxy-fuel or oxygen-enriched combustion is used in included furnaces.

• Selected flow: Industrial oxygen bd4b0f96-2090-4806-a648-335ab20ff401
• Flow property / unit: Volume / m3
• Amount rule: Sum corrected purchased oxygen meter volume attributable to the lot and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_energy_and_gas_balance
• Sources: eu-ferrous-metals-bat-2022

Process water (process_water)

Record make-up process water crossing the product boundary for descaling, cooling, quenching, finishing, or abatement. Do not count internally recycled water again.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: Sum make-up process-water mass entering the included system, exclude internal recirculation, and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_water_balance
• Sources: eu-ferrous-metals-bat-2022

Waste flows

No waste input is required. If a site uses a specific recovered waste as a material input, add one separately identified exchange rather than merging it with steel feedstock.

Elementary flows

No elementary input is prescribed. Water and oxygen supplied as purchased products are recorded above, not as resource withdrawals.

Outputs

Product flows

Reference hollow drill steel (reference_hollow_drill_steel)

This is the accepted unpackaged output that carries the reference flow. Rejected pieces remain in the scrap row and are not included in reference-product mass.

• Selected flow: Hollow drill bars and rods, of steel f809f600-17ff-48b3-85da-01f93dbede3c
• Flow property / unit: Mass / kg
• Amount rule: Set the normalized accepted product output to 1 kg after reconciling measured lot mass
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_material_mass_balance
• Sources: un-cpc-3-0-structure-2025; eu-cn-2020-1577-ch72-note-1p

Waste flows

Post-industrial steel scrap (post_industrial_steel_scrap)

Record offcuts, cropped ends, and rejected steel pieces leaving the foreground process for recovery or disposal. Declare alloy status, contamination, and destination.

• Selected flow: Post-industrial steel scrap c143745d-be4f-4d8f-b403-2dcbfe685349
• Flow property / unit: Mass / kg
• Amount rule: Sum measured outgoing post-industrial steel-scrap mass and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_material_mass_balance
• Sources: eu-ferrous-metals-bat-2022

Mill scale (mill_scale)

Record oxide scale collected from reheating, descaling, hot forming, cooling-water treatment, or finishing as a separate waste exchange. Declare moisture and oil content and recovery destination.

• Selected flow: Mill scale aad763e2-78ab-4fcb-8a3b-8d8525c9e6ca
• Flow property / unit: Mass / kg
• Amount rule: Sum measured as-received mill-scale mass leaving the foreground boundary and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_material_mass_balance
• Sources: eu-ferrous-metals-bat-2022

Wastewater sent to treatment (wastewater_to_treatment)

Record the steel-processing wastewater crossing the foreground boundary to onsite or offsite treatment after subtracting internal recirculation and evaporation. Declare composition, treatment state, and destination.

• Selected flow: Wastewater d2d44ce1-c0f4-461d-9413-f4b33e0d200f
• Flow property / unit: Mass / kg
• Amount rule: Calculate mass from measured discharge mass or same-period volume and recorded density, then divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_water_balance
• Sources: eu-ferrous-metals-bat-2022

Elementary flows

Direct fossil carbon dioxide (direct_fossil_carbon_dioxide)

Record only fossil carbon dioxide emitted directly from included fuel combustion or process carbon at the foreground site. Do not add upstream electricity emissions here.

• Selected flow: carbon dioxide (fossil) 08a91e70-3ddc-11dd-923d-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Sum measured stack mass or calculate from reconciled fossil-fuel carbon and oxidation records, then divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_direct_air_emissions
• Sources: eu-ferrous-metals-bat-2022

Direct nitrogen oxides (direct_nitrogen_oxides)

Record nitrogen monoxide and nitrogen dioxide from included combustion as one reported NOx mass expressed as NO2. Do not substitute nitrous oxide; the exact Tiangong UUID remains unresolved.

• Selected flow: Nitrogen oxides emitted to air, expressed as NO2
• Flow property / unit: Mass / kg
• Amount rule: Sum compliant stack measurements or validated equipment-specific calculations for NOx expressed as NO2 and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_direct_air_emissions
• Sources: eu-ferrous-metals-bat-2022

Direct particulate matter (direct_particulate_matter)

Record total particulate matter emitted to air from included heating, descaling, grinding, rolling, finishing, or abatement when particle size is not separately measured.

• Selected flow: Particulate matter, particle size unspecified 0ce3dedb-caca-407b-a856-a90470eb8ec0
• Flow property / unit: Mass / kg
• Amount rule: Sum measured particulate mass from included sources after abatement and divide by net accepted hollow-drill-steel mass
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_direct_air_emissions
• Sources: eu-ferrous-metals-bat-2022

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_subdivide_first	shared meters, furnaces, finishing lines, water systems, and abatement	Prefer subdivision by lot, line, equipment, or metering period. Allocate only the residual shared quantity that cannot be directly assigned.	eu-ferrous-metals-bat-2022
allocation_residual_mass	residual shared manufacturing inputs and emissions	Allocate residual shared quantities by net accepted product mass only when the same equipment and operating regime serve materially equivalent steel products; otherwise use a documented causal driver such as furnace time, metered energy, or processed feedstock mass.	eu-ferrous-metals-bat-2022
allocation_scrap_no_credit	post-industrial steel scrap and mill scale	Report gross outgoing residue mass and destination without avoided-burden credit inside the foreground inventory. Any recycling credit or burden is applied consistently in the downstream system model and disclosed separately.	eu-ferrous-metals-bat-2022

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_material_mass_balance	hollow_drill_steel_manufacturing	steel feedstock, accepted product, steel scrap, and mill scale	weighbridge tickets, batch scales, production and quality records, residue dispatch records	lot id; steel grade; feedstock form; input mass; accepted product mass; rejected mass; scrap mass; scale mass; moisture/oil basis; destination	Calibrated mass measurement reconciled to lot or homogeneous campaign	kg	each lot or shift, aggregated monthly	at least 12 consecutive representative months or the full campaign when shorter	all included forming and finishing operations at the declared plant	Reconcile input, accepted output, residues, stock change, and documented losses; normalize each exchange by accepted product mass	calibration certificates; lot traceability; mass-balance reconciliation; disposition records; explanation of gaps
cp_energy_and_gas_balance	hollow_drill_steel_manufacturing	purchased electricity, natural gas, and industrial oxygen	meters, invoices, furnace logs, production schedules	meter id; opening/closing reading; unit; reference conditions; fuel composition; oxygen purity; equipment; operating hours; lot or campaign	Calibrated direct metering preferred; invoice allocation only with documented causal driver	kWh, MJ, or m3 as metered	continuous or each shift, aggregated monthly	at least 12 consecutive representative months or the full campaign when shorter	all included production and environmental-control equipment	Subtract exports and excluded uses; convert units under Section 4; allocate residual shared use under Section 7; normalize by accepted product mass	meter calibration; invoice reconciliation; energy balance; furnace and production logs
cp_water_balance	hollow_drill_steel_manufacturing	make-up process water and wastewater	supply and discharge meters, tank records, laboratory reports, water-loop diagram	inlet volume/mass; recycled volume; discharge volume/mass; density; evaporation estimate; stream identity; treatment state; destination	Separate make-up and discharge metering with a documented water balance	kg or m3 as measured	continuous or daily, aggregated monthly	at least 12 consecutive representative months or the full campaign when shorter	all included descaling, cooling, quenching, finishing, and abatement water circuits	Exclude internal recirculation; reconcile inlet, discharge, evaporation, carryover, and stock change; normalize crossing-gate mass by accepted product mass	meter calibration; annual water balance; stream map; density basis; treatment and laboratory records
cp_direct_air_emissions	hollow_drill_steel_manufacturing	direct fossil CO2, NOx, and particulate matter	stack monitoring, fuel analysis, meter data, test reports, abatement logs	source id; pollutant; concentration; flow; duration; oxygen reference; fuel carbon; oxidation basis; abatement status; operating state; product mass	Use compliant direct measurements where available; otherwise use a transparent equipment-specific calculation from reconciled records	kg pollutant and supporting measurement units	continuous where installed or each compliant test campaign; aggregate to production period	same representative period as production data, including documented abnormal operation	every included furnace and relevant mechanical or abatement emission point	Convert concentration and gas flow to mass where required; calculate fossil CO2 from fossil carbon only; sum included sources and normalize by accepted product mass	monitoring standard and calibration; laboratory reports; calculation workbook; source inventory; abnormal-operation record

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_reference_normalization	every inventory row	normalized amount = same-period exchange quantity / net accepted reference-product mass	exchange quantity; accepted hollow-drill-steel mass	amount per 1 kg reference product
calc_material_reconciliation	feedstock, product, scrap, and mill scale	reconcile measured inputs with accepted product, residues, stock change, and separately documented losses; investigate rather than force-closing material gaps	input mass; product mass; residue mass; stock change; documented losses	reconciled material balance and data-gap finding	eu-ferrous-metals-bat-2022
calc_energy_conversion	purchased electricity	MJ = metered kWh × 3.6; retain original meter value and conversion	kWh	MJ
calc_wastewater_mass	wastewater	wastewater mass = measured volume × same-stream density; do not apply a generic density when composition or temperature makes it unsuitable	volume; density; temperature; stream id	kg wastewater	eu-ferrous-metals-bat-2022
calc_nox_as_no2	direct nitrogen oxides	aggregate measured NO and NO2 under the monitoring method and report total NOx as NO2; never substitute N2O	NO; NO2; exhaust flow; operating time	kg NOx as NO2	eu-ferrous-metals-bat-2022

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	reference product	Lot records must identify steel grade, alloy status, cross-section, external and internal dimensions, length, heat treatment, surface state, conformity specification, and accepted mass.	mill certificate; dimensional inspection; heat-treatment and release records
dq_time_alignment	all exchanges	Input, output, waste, and emission data must cover the same representative production period; disclose shutdowns, abnormal operation, and excluded campaigns.	timestamped meter and production records; coverage reconciliation
dq_meter_and_balance	material, energy, gas, and water	Retain calibration status and reconcile meters or invoices to the declared site and process boundary at least annually.	calibration certificates; invoices; annual material, energy, and water balances
dq_uuid_qualifiers	UUID-bearing flows	Verify that each selected Tiangong identity still matches flow type, classification, property, unit group, product state, and required foreground qualifiers before dataset publication.	state-100 identity review record and dataset metadata
dq_unresolved_identity	non-alloy steel, electricity, and NOx rows	Do not publish a proxy UUID. Resolve the exact identity or preserve the explicit unresolved finding in the data package.	candidate audit and reviewer disposition

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validate_reference_identity	reference flow	Confirm the reference UUID, Mass property, kg unit, accepted net mass, and every required product qualifier; reject solid rods, tubes, oil/gas drill pipe, or finished assemblies.	un-cpc-3-0-structure-2025; eu-cn-2020-1577-ch72-note-1p
validate_geometry	products claiming the Chapter 72 hollow-drill-bar definition	Verify suitability for drills, greatest external dimension > 15 mm and <= 52 mm, and greatest internal dimension <= one half of the external dimension.	eu-cn-2020-1577-ch72-note-1p
validate_atomic_inventory	process inventory	Confirm every row is one product, waste, or elementary exchange; conditional routes must not be represented by combined utility, fuel, material, waste, or emission labels.
validate_mass_and_water_balance	foreground records	Confirm same-period material and water balances, investigate unexplained gaps, exclude internal water recirculation from crossing-gate totals, and keep rejected steel out of accepted product mass.	eu-ferrous-metals-bat-2022
validate_direct_emissions	fossil CO2, NOx, and particulate matter	Verify source coverage, measurement or calculation method, abatement state, receiving compartment, fossil-only CO2 accounting, and NOx reporting as NO2; reject N2O as an NOx substitute.	eu-ferrous-metals-bat-2022
validate_range_status	every important flow	Treat absent external ranges as explicit evidence needs; do not convert BAT-AELs, single observations, or scenarios from one publication into empirical product-normalized ranges.	eu-ferrous-metals-bat-2022

10. Published Dataset Profile

Field	Value
dataset_role	foreground production dataset eligible for later use as a secondary_dataset or background_dataset after review
downstream_use	Product-system modelling of declared hollow drill bars and rods at the manufacturing plant gate; aggregation into process or lifecyclemodel datasets with matching geography, period, grade, route, and product state
allowed_use	Studies whose functional unit and system boundary can use 1 kg of unpackaged conforming hollow drill steel and whose required qualifiers match or are transparently adapted
excluded_use	Direct substitution for oil/gas drill pipe, tubes, solid drill rods, assembled drill tools, self-drilling anchor systems, upstream steelmaking, product use, or end-of-life without additional modelling
required_metadata	PCR id and version; reference UUID; CPC context; plant geography and period; grade and alloy status; feedstock form and upstream datasets; cross-section and dimensions; forming and heating route; heat treatment; surface and inspection state; allocation; water-loop boundary; electricity, fuel, and oxygen qualifiers; residue destinations; abatement and emission methods; unresolved identities
required_quality_disclosure	Temporal and site coverage; meter and scale calibration; material, energy, and water reconciliation; direct-versus-calculated data share; data gaps and substitutions; abnormal operation; mass allocation; UUID audit status; absence of empirical ranges
update_trigger	New grade, cross-section family, feedstock form, forming or heat-treatment route, plant or grid geography, fuel or oxygen technology, water-loop boundary, abatement system, residue destination, allocation method, exact UUID resolution, or evidence-backed range synthesis

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	Official guidance (official_guidance)	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025, official CSV: https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-04)	Official CPC 41273 product identity and separation from CPC 4128 tubes, pipes, hollow profiles, and oil/gas drill pipe
eu-cn-2020-1577-ch72-note-1p	Standard (standard)	Commission Implementing Regulation (EU) 2020/1577, Combined Nomenclature, Chapter 72 Note 1(p), Official Journal L 361, 30 October 2020: https://eur-lex.europa.eu/eli/reg_impl/2020/1577/oj/eng/pdf (retrieved 2026-09-04)	Legal hollow-drill-bar geometry and exclusion to heading 7304 when the definition is not met
eu-ferrous-metals-bat-2022	Official guidance (official_guidance)	Commission Implementing Decision (EU) 2022/2110, BAT conclusions for the ferrous metals processing industry: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32022D2110 (retrieved 2026-09-04)	Hot-working process decomposition; feedstock heating; oxygen-enriched combustion; water, energy, materials, wastewater, residues, dust and NOx monitoring; mill-scale and scrap management
china-2024-serbia-tariff-72288000	Official guidance (official_guidance)	Ministry of Finance of the People's Republic of China, 2024 agreement tariff schedule for Serbia, tariff line 72288000: https://gss.mof.gov.cn/gzdt/zhengcefabu/202406/P020240625320768010766.pdf (retrieved 2026-09-04)	Verified professional Chinese term “空心钻钢” used in the manifest title and category rendering