DID YOU KNOW that the Material Test Certificate is the most frequently provided — and most frequently unchecked — quality document in Indian metal exports? Most procurement teams verify that an MTC exists. Far fewer verify that it actually certifies the correct material, grade, and batch. And fewer still check the three things that determine whether an MTC is legally valid for their specific order. These three failure modes are different problems with different root causes — and all three are common enough that experienced project QA managers check for them before the goods leave the Indian port, not when they arrive on site.
What an MTC certifies — and what it does not
An MTC (also called a Mill Test Certificate, Material Inspection Certificate, or Test Report) documents the chemical composition and mechanical properties of a specific heat or production lot of raw material, as tested by the manufacturer's quality department or an approved testing laboratory. What it certifies: that the raw material from which the product was made met specified chemical and mechanical requirements at the time of testing. What it does NOT certify: that the finished fabricated product — cut, punched, formed, welded and coated — meets all specification requirements; that the coating was applied correctly; or that the finished dimensions and tolerances were met. An MTC is a raw-material document. It is necessary but not sufficient for confirming finished-product quality. For fabricated metal, it must be read alongside a dimensional inspection report and, for galvanized products, a coating-thickness measurement report.
EN 10204 certificate types — the most important field on any MTC
EN 10204 (Metallic Products — Types of Inspection Documents) is the international standard defining inspection document types. It is referenced in virtually every project specification for industrial metal worldwide. Type 2.1 — Declaration of Compliance: the manufacturer states that the product meets the specification. No test data is provided or required. This is the weakest form and is refused by project specifications requiring 3.1. Type 2.2 — Test Report: manufacturer provides test results from generic non-specific testing — not on the actual heat number supplied to you. Better than 2.1, but not traceable to your order. Type 3.1 — Inspection Certificate (manufacturer's authorised inspector): test results from the specific heat or batch supplied, certified by the manufacturer's own quality-authorised inspector. This is the standard required by most international EPC, utility and government project specifications — and what Vajra provides as standard. Type 3.2 — Inspection Certificate (manufacturer + independent third-party): 3.1 plus a second independent inspector signature from SGS, BV, TÜV or similar. Required for defence, nuclear, ASME-pressure-vessel and some petrochemical specifications.
Reading an MTC line by line
- Heat Number / Lot Number / Batch Number: the unique identifier linking this document to a specific cast or production run. This is the traceability anchor. If your PO specified heat traceability, this number must appear on the product label or bundle tag — not just on the document.
- Chemical Composition (% by mass): the content of each alloying element. For IS 2062 E250A structural steel: Carbon ≤ 0.23%, Manganese ≤ 1.50%, Silicon ≤ 0.40%, Sulphur ≤ 0.045%, Phosphorus ≤ 0.045%. If any element exceeds the limit, the material has failed — regardless of mechanical properties.
- Mechanical Properties — the three numbers that matter: Yield Strength (Re, MPa): the stress at which the material permanently deforms. IS 2062 E250A minimum: 250 MPa. Tensile Strength (Rm, MPa): the maximum stress before fracture. IS 2062 E250A: 410–540 MPa. Elongation (%): the ductility measure. IS 2062 E250A minimum: 23%.
- Test Method References: the MTC should cite which test standards were applied — IS 1608 for tensile, IS 1757 for Charpy impact, IS 228 for chemical analysis (or ASTM A370, EN ISO 6892 etc.). If no method is cited, the certificate's verifiability is significantly reduced.
- Specification Reference: confirms which standard and grade applies. If your PO specified IS 2062 E250A and the MTC references IS 2062 E250 (without the 'A' suffix denoting the controlled weldability variant), that is technically a different sub-grade.
- Inspector Identification: for Type 3.1, the authorised inspector's name, designation and signature must be present. For 3.2, a second independent inspector signature is required. A stamp-only MTC without individual identification is not a compliant 3.1.
- Test Date vs Ship Date: the test date must be on or before the bill of lading date. An MTC dated after shipment covers a different batch — or was back-dated.
The 3 things that make an MTC invalid
- Invalid #1 — No traceability link between the MTC and the physical goods: the heat number on the MTC is not on the product label, bundle tag or packing list. You cannot confirm the certificate applies to what you received. Fix: specify on the PO that every bundle must be labelled with the heat number, and the packing list must list heat numbers against each line item. Pre-shipment inspection (SGS etc.) verifies this link before loading.
- Invalid #2 — The MTC covers a different standard or sub-grade than what was specified: IS 2062 E250 ≠ IS 2062 E250A. ASTM A36 ≠ ASTM A572 Gr.50. EN 10025 S275JR ≠ S275J0 (different impact testing temperature requirement). This is caught in 10 seconds by reading the specification reference line — and frequently missed by procurement teams who check for 'an IS 2062 MTC' without reading the full designation.
- Invalid #3 — The certificate is Type 2.1 or 2.2 when 3.1 was specified: a compliance statement (2.1) looks identical to a test certificate (3.1) to a non-specialist. The difference is whether actual measured test values are reported, and whether a named authorised inspector certified them on the specific batch. If your project specification requires EN 10204 3.1, a 2.1 declaration is non-conforming — even if the values shown would have met the standard had specific testing been conducted.
What Vajra provides as standard and on request
Standard with every commercial export shipment: EN 10204 Type 3.1 MTC for raw material, sourced from primary Indian mills (SAIL, JSW Steel, Tata Steel, Shyam Steel), with heat number documented on the product label and packing list. Dimensional inspection report for fabricated items. XRF coating-thickness measurement report for all hot-dip galvanized orders, confirming compliance with ASTM A123 Grade 85. On request: EN 10204 Type 3.2 with witness by SGS, Bureau Veritas, TÜV Rheinland, OMIC or your nominated inspector. Chemical re-analysis at an accredited external laboratory (NABL-accredited). Source inspection at Howrah with inspector present at raw material receipt, in-process check and final pre-shipment stage. All documentation is included in the shipment package by default — we do not charge separately for MTC preparation or supply it only on request after the goods have sailed.
A valid 3.1 MTC has three things: actual tested values (not 'meets spec'), the heat number traceable to the physical goods, and a named authorised inspector who certified those results on that specific batch. If any of the three is missing, ask before the container is sealed — not after it arrives.