Mill Test Report

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A Mill Test Report (MTR) and often also called a Certified Mill Test Report, Certified Material Test Report, Mill Test Certificate (MTC), Inspection Certificate, Certificate of Test and a host of other names is a quality assurance document used in the metals industry that certifies a material's chemical and physical properties and states a product made of metal (steel, aluminum, brass or other alloys) compliance with an international standards organization (such as ANSI, ASME, etc.) specific standards.

Mill here refers to an industry which manufactures & processes Raw Materials.


An MTC provides traceability and assurance to the end user about the quality of the steel used and the process used to produce it.

Typically a European MTC will be produced to EN 10204. High quality steels for pressure vessel of structural purposes will be certificated to 3.1 or 3.2. 3.2 requires an independent test by a certification body such as Lloyds Register, but 3.1 requires a certified quality systems

The MTC will specify the type of certificate, the grade of steel and any addenda. It will also specify the results of chemical and physical examination to allow the purchaser or end user to compare the plate to the requirements of the relevant standards.