Mill test report
A mill test report, or MTR, is a document from the steel producer certifying the chemical and mechanical properties of a specific heat or lot of material.
A mill test report, or MTR, is a document from the steel producer certifying the chemical and mechanical properties of a specific heat or lot of material.
Definition
A mill test report is a quality record issued by a steel mill for a particular production lot or heat. It lists chemistry, mechanical test results and the standard the material was made to.
A plain example
A buyer receives coil or sections with a report. They match the heat or coil number printed on the material to the number on the report, then compare the stated grade, yield, tensile and coating with the specification.
Why it matters
The report is the evidence that the steel delivered is the steel that was specified. Without it, traceability is lost, and substituting an unknown grade can affect structural work. It is commonly requested in submittals and at inspection.
Common confusion
An MTR is not a certificate of conformity, which is a broader statement that a product meets requirements. It is also easy to accept a report that does not match the material in hand: always check the heat number, standard and date, and ask for a clarification if they differ.
On a project
Compare heat or coil numbers, grade, mechanical values and coating on the report with the specification. Keep the reports with the delivery records so they can be produced at inspection.
Quick answers
- What links an MTR to the material? A heat or coil number that appears on both the report and the material.
- Does an MTR show the zinc coating? For coated steel, the report or an attached document may state the coating designation. Check the specification.
- Is an MTR the same as a certificate of conformity? No. An MTR is test data from the mill, while a CoC is a statement of compliance.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
What links an MTR to the material?
A heat or coil number that appears on both the report and the material.
Does an MTR show the zinc coating?
For coated steel, the report or an attached document may state the coating designation. Check the specification.
Is an MTR the same as a certificate of conformity?
No. An MTR is test data from the mill, while a CoC is a statement of compliance.
Sources and further reading
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