EN 10204 Type 3.1 vs 3.2 — Inspection Certificate Guide

The four EN 10204 document types

Type 3.1 = mill certifies; Type 3.2 = mill + independent third-party certifies. 3.1 is self-certified by the mill; 3.2 requires an accredited external inspector to counter-sign.

EN 10204 (2004) defines four inspection document types. Type 2.1 is a Declaration of Compliance — the mill simply states the product conforms to the order specification, with no test results attached. Type 2.2 is a Test Report — the mill provides actual test results (chemical, mechanical) but does not include an authorized inspector's signature. The two types most commonly discussed are 3.1 and 3.2.

Type 3.1 (Inspection Certificate 3.1) is an Inspection Certificate signed by the manufacturer's Authorized Representative. It contains the mill's name, product identification (heat number, batch, grade), full chemical composition and mechanical test results, and confirms conformance to the ordered specification. This is the standard MTC for most domestic Indian procurement. The Authorized Representative is an employee of the mill designated to certify on behalf of the quality management system.

Type 3.2 (Inspection Certificate 3.2) is the same document as 3.1, but counter-signed by an independent third-party inspector. The inspector verifies the test results against the material specification, confirms the heat/batch traceability, and adds their registration number and signature. This dual-signature structure provides stronger assurance that the material meets specification — the mill certifies production, and the inspector certifies independent verification.

Which Indian buyers require Type 3.2

IBR: mandatory Type 3.2. CPWD/PWD: 3.1 for structural, 3.2 for pressure items. Export/marine: always Type 3.2.

Indian Boiler Regulations (IBR) require Type 3.2 for boiler-grade material. Form III-C (IBR) explicitly references an Inspection Certificate 3.2 from an IBR-recognized inspection agency. For any pipe, tube, or fitting entering an IBR-registered boiler, the mill must provide 3.2 — 3.1 alone is insufficient. This applies to power plants, refineries, petrochemical plants, and any installation requiring IBR approval.

CPWD (Central Public Works Department) and PWD (State Public Works Departments) generally accept Type 3.1 for non-pressure structural work. However, for pressure-containing items — boiler feedwater lines, steam lines, critical process piping — many state PWDs now specify Type 3.2 in the tender documents. Always verify the tender specification, as requirements vary by state and project.

BIS (Bureau of Indian Standards) product certification (ISI mark) is separate from EN 10204. BIS certification verifies the product meets IS specification; EN 10204 verifies the specific heat/batch meets the order specification. They address different things — ISI mark does not substitute for Type 3.2, and Type 3.2 does not imply BIS certification.

Ministry of Railways (Railway Board) procurement specifications typically require Type 3.2 for pressure-rated components in locomotive, coach, and wagon applications. Rail wheel factories, coach factories, and locomotive workshops specify 3.2 under their quality plans.

Export orders to GCC countries (Saudi Aramco, KOC, ADNOC), marine Classification Societies (LR, DNV, ABS), and international EPC contractors universally require Type 3.2. This is not optional — the purchase order will not be accepted without the third-party counter-signature.

Cost and lead-time impact

Type 3.2 adds approximately ₹800–2,500 per MT and 3–7 working days lead time over Type 3.1.

Type 3.2 inspection adds both cost and lead time compared to Type 3.1. Third-party inspection agencies in India typically charge ₹1,500–3,500 per hour of inspection time, with a minimum of 2 hours for small lots. For a standard 5–10 MT heat lot of seamless pipe, the inspection fee ranges from ₹8,000–18,000 per lot, translating to approximately ₹800–2,500 per MT for typical order quantities.

Lead time extends by the time required to schedule and complete the inspection. In Kanpur, Chennai, and Mumbai inspection hubs, SGS and BV can typically schedule inspection within 2–3 working days of booking. The inspection itself takes 2–4 hours on-site, and the certificate is issued 1–2 working days after the inspection. Total lead-time delta: 3–7 working days over a standard 3.1 dispatch.

For domestic non-critical applications, the additional cost of Type 3.2 may not be justified. Water-works projects, scaffolding, and non-pressure structural work typically do not require the third-party layer. The decision tree is straightforward: if the customer specification, tender document, or regulatory framework explicitly requires 3.2 — it is not optional.

Who can issue Type 3.2 in India

Accredited third-party inspectors only: SGS, BV, TÜV, IRClass, RINA, LRQA, DNV — each with specific scope of accreditation.

Type 3.2 must be issued by an independent inspection body with relevant accreditation. The inspection body must have a scope of accreditation covering the material specification being certified — a certification for seamless boiler tubes (SA210) requires different scope than that for carbon steel plates (IS 2002) or alloy tubes (SA213).

The major third-party inspection agencies operating in India include: SGS (SGS India Private Limited, Mumbai) — the largest inspector network with extensive IS/ASME/ASTM scope accreditation; Bureau Veritas (BV India), Mumbai — French-classification society with global recognition; TÜV SÜD (TÜV SÜD South Asia), Bangalore — German technical inspection service; IRClass (Indian Register of Shipping), Mumbai — Indian classification society with BIS recognition; RINA (RINA India), Chennai — Italian classification and inspection service; Lloyd's Register (LRQA India), Mumbai; and DNV (DNV India), Mumbai.

Verify the agency's accreditation before booking. The inspector must appear on the BIS recognized inspectors list for the product category, and for IBR work, must be recognized under the Central Boilers Board. Request the scope of accreditation certificate and confirm the material specification is covered before the inspection is scheduled.

What a Type 3.2 certificate looks like

3.2 certificate = 3.1 content + inspector counter-signature + registration number. Same test data, independent verification layer.

A Type 3.2 certificate follows a structured format. The header shows: document title ("Inspection Certificate 3.2"), certificate number, date of inspection, and reference to EN 10204:2004. The mill identification block includes: mill name and address, Authorized Representative name, mill test certificate (3.1) reference number, and manufacturing location.

The product identification block specifies: material specification (e.g., ASTM A106 Grade B, SA210 Grade A1, IS 1239 YST 310), heat number or batch number, quantity in kilograms or metric tonnes, dimensions (nominal bore, outside diameter, wall thickness, length), and any special markings.

The test results section presents the actual chemical composition (carbon, manganese, phosphorus, sulphur, silicon — reported as weight percent to two decimal places), Yield Strength, Tensile Strength, Elongation percentage, and any additional tests performed (hydrostatic test pressure and hold time, hardness, impact values).

The critical section is the inspector verification: the inspector's signature, printed name, inspection agency, agency stamp or seal, and the inspector's registration number. This counter-signature is what distinguishes 3.2 from 3.1 — it certifies that the test results have been verified by an independent party.