Mill test certificate requirements vary significantly across industries. The certificate type, signatory requirements, supplementary tests, and retention periods all depend on the governing code, the end-use application, and the specific client or project standard. This page summarises the key requirements by sector.
Quick Answer
Quick Answer
Oil and gas and power generation typically require EN 10204 Type 3.1 or 3.2 with chemical and mechanical data. ASME-coded pressure equipment requires certified material test reports (CMTRs). Structural steel under EN 1090 requires 3.1 minimum. Pharmaceutical and food-grade applications require chemistry plus trace element confirmation. Shipping requires class society approval.
Oil and Gas
Oil and gas is one of the most demanding sectors for material certification. The combination of high pressure, elevated or cryogenic temperatures, sour service (H₂S), and offshore environments drives stringent material qualification requirements.
Pressure-Containing Parts
- Certificate type: EN 10204 Type 3.2 is the default for pressure-containing piping, fittings, valves, and vessel components in most major company specifications
- Chemical requirements: carbon equivalent limits, NACE MR0175 / ISO 15156 hardness restrictions for sour service, HIC-resistant chemistry (low sulphur, Ca treatment) for sour pipeline service
- Mechanical requirements: impact testing at design temperature, CTOD testing for fracture mechanics-critical applications
- Additional tests: HIC test, SSCC test for sour service; PWHT simulation tests for some grades
Structural and Non-Pressure Items
- Certificate type: EN 10204 Type 3.1 typically acceptable for non-pressure structural members
- Standard references: NORSOK M-120, M-630, Shell DEP series, ExxonMobil GP-PIP-CPM-001, Saudi Aramco SAES-A-206
Key Standards
- API 5L (line pipe), API 5CT (casing and tubing), API 6A (wellhead equipment)
- NORSOK M-650 (qualification of manufacturers of special materials)
- ASTM A106, A333, A334, A105, A182 (carbon and alloy steel piping and fittings)
Power Generation
Boilers and Pressure Vessels
- Certificate type: EN 10204 Type 3.1 for most components; Type 3.2 for nuclear and high-consequence applications
- Key codes: ASME Section I (power boilers), ASME Section VIII Div. 1 and 2 (pressure vessels), EN 12952 (water tube boilers), EN 12953 (shell boilers)
- ASME-specific: materials used in ASME-coded construction must be certified to ASME material specifications (SA-106, SA-516, SA-335, etc.) with a Certified Material Test Report (CMTR). The CMTR is ASME's equivalent of an MTC — it must include chemical and mechanical test data certified by the manufacturer
Nuclear
- Certificate type: EN 10204 Type 3.2 as a minimum; nuclear applications reference additional codes
- Additional requirements: ASME Section III (nuclear components), RCC-M (French nuclear code), additional surveillance testing, traceability to the nuclear safety classification of the component
- Documentation: significantly more extensive than non-nuclear — includes material identification, qualification tests, surveillance programme data
Turbine Components
- Certificate type: 3.1 or 3.2 depending on the OEM specification
- Special requirements: creep properties for high-temperature alloys, fatigue data for rotating components
Chemical and Process Industry
Pressure Equipment Directive (PED 2014/68/EU)
Equipment placed on the EU market must comply with PED. For pressure-bearing materials:
- Categories I–II: EN 10204 Type 2.2 or 3.1 typically sufficient
- Categories III–IV: EN 10204 Type 3.1 required; 3.2 for the most critical fluids and pressures
- Annex I, Section 4: specifies that materials must be certified by a document confirming compliance with the specifications stated in the harmonised standard
Corrosion-Resistant Applications
- Stainless steel and nickel alloys require chemical composition certification for corrosion resistance claims
- ASTM A276 (stainless bar), A312 (stainless pipe), B165 (Nickel-Copper alloy) certificates must confirm key elements — Cr, Mo, Ni within specification ranges
- Delta ferrite content (for austenitic stainless weld material) is sometimes required
Cryogenic Service
- Extended Charpy impact testing at cryogenic temperatures (−196°C for 9% Ni steel, −165°C for LNG applications)
- ASTM A333 Gr.8, A334 Gr.8, EN 10028-4 grades
Pharmaceutical and Biotechnology
The pharmaceutical and biotech sector uses stainless steel extensively for vessels, piping, and heat exchangers in GMP (Good Manufacturing Practice) environments.
Typical Requirements
- Certificate type: EN 10204 Type 3.1 for all product-contact surfaces; 3.2 for critical applications
- Chemistry focus: confirmation that Cr ≥ 16%, Mo ≥ 2.0% (for 316L), and carbon ≤ 0.03% (for L grades) — these are the parameters governing corrosion resistance and weld sensitisation risk
- Trace elements: some specifications require confirmation of trace elements that could leach into product streams
- Surface finish: Ra values for electropolished surfaces are often specified alongside the MTC
- Additional documents: material declaration (RoHS, REACH compliance), certificates confirming no conflict minerals for some clients
Relevant Standards
- ASTM A270 (seamless and welded austenitic stainless steel sanitary tubing)
- ASME BPE (bioprocessing equipment)
- EHEDG guidelines
Structural Steel and Construction
EN 1090 (EU Structural Steel Fabrication)
EN 1090 requires material certification as part of its Execution Classes framework:
- EXC1: EN 10204 Type 2.1 or 2.2 acceptable for some products
- EXC2: EN 10204 Type 3.1 required for structural steel
- EXC3 and EXC4: EN 10204 Type 3.2 required for primary structural members
AISC and ASTM (USA)
- Structural steel in the US is certified under ASTM A36, A572, A992, etc.
- The Certificate of Mill Test is the standard document — equivalent to EN 10204 3.1
- AISC 360 requires material certifications to be available
Reinforcing Bar (Rebar)
- ASTM A615 (carbon steel rebar), A706 (low-alloy), BS 4449 (UK)
- Certificates required for all reinforcing steel in engineered structures
- Traceability to heat number required for seismic applications
Shipbuilding
Classification society approval is the defining feature of material certification in shipbuilding:
- ABS, DNV, Lloyd's Register, Bureau Veritas, ClassNK, RINA all operate material approval schemes
- Structural steel must be certified by the classification society to their own rules (ABS Rules for Building and Classing, DNV Rules for Classification)
- This involves both mill qualification (the mill must be approved by the class society) and product certification (each delivery certified to class society requirements)
- Certificate type: Class certificate, which incorporates the requirements of EN 10204 Type 3.2 in practice
Frequently Asked Questions
What is a CMTR and how does it differ from an MTC?
A Certified Material Test Report (CMTR) is the ASME code terminology for what is broadly called an MTC. The CMTR format follows ASME material specification requirements rather than EN 10204, but the content — chemical and mechanical test data certified by the manufacturer — is the same. CMTRs are required for all materials used in ASME-coded construction.
Can I use an EN 10204 certificate for ASME-coded work?
Not directly. ASME material specifications (SA-106, SA-516, etc.) are the relevant certifiable specifications for ASME-coded construction. However, many mills produce steel that meets both ASME/ASTM and EN specifications and issue dual-certified MTCs. The ASME specification must be explicitly listed on the certificate.
What certificate is required for sour service materials?
Sour service materials must comply with NACE MR0175 / ISO 15156. The MTC must confirm hardness values within the specified limits, and for some grades, HIC (hydrogen-induced cracking) test results are required. Most oil company specifications require EN 10204 Type 3.2 for sour service pressure-containing materials.
Do pharmaceutical MTCs need to confirm trace elements?
Standard MTCs for 316L stainless confirm the major alloying elements. Some pharmaceutical clients or GMP specifications additionally require trace element analysis and/or material declarations for leachables. Always consult the specific project or client specification.
How do I manage different certificate requirements across a multi-discipline project?
Centralised certificate management — with configurable validation rules per specification and product type — handles this most efficiently. A digital platform that supports multiple standards databases and allows project-specific override rules eliminates the risk of applying the wrong validation criteria to a certificate.
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