Mill Test Report

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 declared to 3.1 or 3.2 or certificated to 4.1 or 4.2.

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.

In steel industry, MTC means mill's test certificate. Some mills also call it as MTR, that is, mill's test report.

One MTC must contain the following information: steel mill's name, heat number, batch number, final test result, steel pipe dimension (steel pipe diameter, wall thickness, length), quantity, steel grade, standard/specification, chemical analysis composition results, mechanical test properties results. If applicable, there also should be hydro test result,UT result, hardness test result, CVN impact results, metal graphic result etc.

Usually mill will issue a table as the format of MTC of steel pipe or steel plate, to be filled with enough test results. Few companies will issue a report format as MTC for steel pipes.

There are mainly two types of MTC in steel industry, as for steel plates or steel pipes, there must be specific inspection scope or lists:

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