OpenEPCIS Iron & Steel Vocabulary
Vocabulary for the iron & steel ESPR priority product group (Regulation (EU) 2024/1781 Annex I; iron & steel named in Article 5 / the 2025-2030 working plan). Covers steel-specific identification (heat / cast / lot numbers, grade classification per EN 10020 and designation per EN 10027), production route, and the Material Test Certificate (EN 10204 inspection documents with EN 10168 mechanical and chemical parameters). This module is intentionally thin per the project's four-layer delegation pattern. Steel-specific concepts live here; cross-cutting concerns (recycled content, substances of concern, environmental product declaration, carbon footprint, documents) reuse the lifted `oec:` vocabulary plus `untp:` and `gs1:`. Aligned with the DPP Keystone iron & steel profile (dppk:IronSteelProduct / dppk:MaterialTestCertificate).
Iron & Steel Product
An iron or steel product (e.g. rebar, structural section, plate, coil, wire rod) subject to the ESPR iron & steel delegated act. Carrier for steel identification, grade/designation, production route, and the Material Test Certificate. Reuse oec: terms for recycled content, substances of concern, environmental product declaration, and supporting documents.
ESPR iron & steel product group. GS1 Web Vocabulary has gs1:Product but no steel-specific identification or test-certificate structure. Anchored to the DPP Keystone peer profile dppk:IronSteelProduct and to the oec:IronSteel product category.
Heat Number
Heat (melt) number identifying the batch of molten steel from which the product was cast (EN 10168 traceability).
Steel traceability identifier per EN 10168. GS1 gs1:hasBatchLotNumber is the closest generic batch identifier; this property names the steel heat specifically. schema:serialNumber stays an ungraded pointer: it is domained on schema:IndividualProduct, so it identifies one piece, while a heat number identifies the melt every piece came from.
Cast Number
Cast number identifying the casting run within a heat (EN 10168 traceability).
Steel traceability identifier per EN 10168. Closest GS1 generic is gs1:hasBatchLotNumber. schema:serialNumber stays an ungraded pointer: it is domained on schema:IndividualProduct, so it identifies one piece, while a cast number identifies the casting run.
Lot Number
Delivery lot number for the steel product.
Closest GS1 generic is gs1:hasBatchLotNumber; this property names the steel delivery lot specifically. schema:serialNumber stays an ungraded pointer: it is domained on schema:IndividualProduct, so it identifies one piece, while a lot number identifies the delivery lot.
Product Number
Manufacturer product / article number for the steel product.
Manufacturer product number. Anchored to schema:productID and schema:mpn. GS1 Web Vocabulary has no product/model-number property.
Purchaser Order
Purchaser order reference associated with the steel delivery.
Order reference per EN 10168 certificate metadata. Anchored to schema:orderNumber.
Steel Grade Classification
Classification of the steel grade per EN 10020 (unalloyed, stainless, other alloy).
Steel grade classification per EN 10020. No GS1, SEMICeu, or schema.org equivalent.
Steel Designation
Steel name / number designation per EN 10027 (e.g. S355J2 / 1.0577).
Steel designation per EN 10027 (parts 1 name, 2 number). No GS1, SEMICeu, or schema.org equivalent.
Melt and Pour Country
Country where the steel was melted and poured (ISO 3166-1 alpha-2). Relevant to origin and CBAM reporting.
Melt-and-pour origin per steel-sector practice and CBAM. Anchored to schema:countryOfOrigin.
CBAM Report ID
Identifier of the Carbon Border Adjustment Mechanism report associated with the steel product.
CBAM (Regulation (EU) 2023/956) report reference. No GS1, SEMICeu, or schema.org equivalent.
Steel Production Technology Route
Primary steelmaking route, a key driver of embodied carbon.
Steelmaking route classification. No GS1, SEMICeu, or schema.org equivalent.
Blast Furnace / Basic Oxygen Furnace
Electric Arc Furnace
Open Hearth Furnace
Other Route
Technology Route
Primary steelmaking route used to produce the product.
Production-route classifier; DPP Keystone expresses dppk:technologyRoute as free text. No GS1, SEMICeu, or schema.org equivalent.
Material Test Certificate
An inspection document for metallic products per EN 10204 (type 2.1, 2.2, 3.1, or 3.2), carrying the EN 10168 mechanical and chemical test parameters that substantiate the declared grade.
Mill test certificate (EN 10204 / EN 10168). schema:Certification is the generic upstream; this class names the steel inspection document and its EN 10168 parameter set. Anchored to the DPP Keystone peer profile dppk:MaterialTestCertificate.
Links a steel product to its Material Test Certificate (EN 10204).
Mill test certificate link per EN 10204. Anchored to the DPP Keystone peer profile dppk:mtc.
MTC Inspection Document Type
EN 10204 inspection document type: 2.1, 2.2, 3.1, or 3.2.
EN 10204 inspection document type. No GS1, SEMICeu, or schema.org equivalent.
MTC Nominal Size
Nominal dimension of the tested product (mm).
EN 10168 dimensional parameter.
MTC Weight Tolerance
Permitted weight tolerance of the tested product (%).
MTC Yield Strength
Measured yield strength Re (MPa).
EN 10168 mechanical parameter.
MTC Tensile Strength
Measured ultimate tensile strength Rm (MPa).
EN 10168 mechanical parameter (Rm).
MTC Yield Strength Ratio
Ratio of yield strength to tensile strength (Re/Rm).
MTC Elongation
Percentage elongation after fracture (A%).
MTC Relative Rib Area
Relative rib area fR for ribbed reinforcing steel (bond performance).
EN 10168 mechanical parameter for reinforcing steel.
MTC Carbon Content
Carbon content from the cast/ladle analysis (mass %).
EN 10168 chemical parameter.
MTC Phosphorus Content
Phosphorus content from the cast analysis (mass %).
MTC Sulfur Content
Sulfur content from the cast analysis (mass %).
MTC Copper Content
Copper content from the cast analysis (mass %).
MTC Nitrogen Content
Nitrogen content from the cast analysis (mass %).
MTC Carbon Equivalent
Carbon equivalent value (CEV / CET), a weldability indicator derived from the cast analysis.
EN 10168 derived chemical parameter (weldability).
MTC Steel Process
Steelmaking process recorded on the certificate (free text where the controlled eusteel:TechnologyRoute is not used).
EN 10168 process descriptor.
MTC Finishing
Finishing / delivery condition recorded on the certificate (e.g. hot-rolled, normalised, quenched and tempered).
EN 10168 delivery-condition descriptor.
MTC Radiometric Control
Radiometric (radioactivity) control result for the steel, where declared.
EN 10168 radiometric control parameter.