What is MTC for Steel Sections? Complete Guide to Mill Test Certificate

Introduction

When purchasing steel sections including H beams, angle steel, channel steel and I beams for overseas construction, shipbuilding and EPC projects, buyers always request MTC, short for Mill Test Certificate. Without valid MTC matching the heat number, your cargo may be rejected at site or held by customs.

MTC is the official quality document issued by steel mill, to certify the chemical composition and mechanical properties of steel sections comply with required standards such as EN, ASTM, GB or classification society rules.

What is Steel Section MTC

MTC = Mill Test Certificate. It is issued by steel mill QC department, linked to one unique heat number for one batch of steel.

Common standard: EN 10204

• EN 10204 3.1: Issued by mill independent QC, widely used for steel section export
• EN 10204 3.2: Issued with third-party witness, required for marine & offshore high-spec projects

Important: MTC is mill’s own test certificate, not third-party lab report like SGS or BV.

Key Information on Valid MTC

1. Mill name, stamp & signature
2. Heat Number / Cast No. (most critical traceability ID)
3. Product type: H beam, angle steel, channel steel, size, length, weight
4. Steel grade: S355JR, A36, Q355B, CCS marine grade etc.
5. Applied standard: EN10025, ASTM A6, GB/T706, CCS rules
6. Chemical composition: C, Mn, Si, P, S
7. Mechanical properties: yield strength, tensile strength, elongation, Charpy impact value
8. Heat treatment condition, certificate serial number

Why MTC Matters for Steel Export

1. Project acceptance: Mandatory document for site inspection of steel structure & shipyard projects
2. Customs clearance: EU and many countries require MTC for steel import declaration
3. Material traceability: Trace back production record via heat number if quality issues happen
4. Contract proof: Legal evidence for international trade disputes

MTC Inspection Checklist for Buyers

1. Confirm certificate type: EN10204 3.1 or 3.2 as per project requirement
2. Match Heat Number: MTC heat number must be identical to stamping on steel section
3. Check steel grade & standard against purchase order
4. Verify dimension, length and weight match packing list
5. Check chemical elements, ensure P & S within limit
6. Validate mechanical test results: yield, tensile, elongation & impact energy
7. Check mill stamp and signature, avoid forged or edited certificates

Common Misconceptions

1. ❌ One MTC can cover multiple heat batches ✅ No. Each heat needs separate MTC.
2. ❌ MTC equals third-party inspection report ✅ No. MTC is mill document; 3.2 includes third-party witness.
3. ❌ Valid MTC means no surface defects ✅ MTC only proves material properties. Surface inspection & NDT are separate.
4. ❌ Normal 3.1 MTC works for shipbuilding steel ✅ Marine grade steel needs classification society approved MTC (CCS etc.)

Our Service

We supply H beam, angle steel, channel steel and other structural steel sections. Every shipment comes with EN10204 3.1 MTC with matched heat number. Marine steel sections can be supplied with CCS certificates. All heat numbers stamped on steel match MTC, supporting third-party re-inspection for construction and shipbuilding projects. Contact us if you need EN10204 3.2 witness certificate or special document requirements.

Conclusion

MTC acts as material ID for steel section international trade. Always verify heat number, grade and test data before shipment to avoid costly rejection and demurrage. Feel free to contact us for steel section sourcing and document support.