January 23rd, 2023

Mill Test Reports (MTRs) are one of the most important aspects within the steel industry and any other industry where steel is used for processing purposes. MTRs document the physical and chemical properties of the material being tested, as well as the fact that the material is following an international standards organization's specific standards. These reports are also commonly referred to as a Certified Mill Test Report, Metallurgical Test Report, Mill Test Certificate (MTC), Inspection Certificate, or Certificate of Test.

Why Mill Test Reports (MTRs) are Required

MTRs are essential information for the end user because different projects require different steel grades. For example, Special Bar Quality (SBQ) steel requires specific methods of preparation and chemistry levels that a mild/low carbon steel grade such as AISI 1018 would not. MTRs provide traceability and assurance to the end user about the quality of the material and the process used to produce it. MTRs typically include the following:

  • ASTM and/or ASME standards compliance
  • Specific size, shape, and/or diameter specifications
  • Chemical and physical property specifications
  • Country of the melt and manufacture

Mill Test Report (MTR) Standardization

MTRs are essential for steel manufacturers to ensure they provide their clients with quality materials that meet all specifications. The Material Test Reports are equally important for the end user of steel products. For example, sanitary products need specific material compositions to preserve the quality of the product that structural steel projects would not require. MTRS are confirmation that the material, in this case steel, complies with all standards needed for its future applications.

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