What is a Mill Test Report (MTR)? 

Frequently referred to as an MTR, a mill test report is a record of the material’s chemical and physical properties. Within an MTR you can verify conformance to applicable specifications.

Consider the MTR as the pedigree or recipe of the part. The MTR is associated/identified with the material typically through a heat code or serial number on the physical part. The MTR is created/issued by the manufacturer of the material and is considered a legal document and cannot be altered or modified by anyone except for the original issuer/manufacturer. An MTR commonly has the following information:

• Manufacturer name and information.
• Manufacture Date
• Traceability number (heat code and/or serial number)
• Description of item and conformance to applicable standards (Design and Material) along with year/revision/edition of the standard.
  • Applicable mechanical properties (Tensile, Yield, Hardness, notched toughness)
  • Chemical properties
  • Heat Treatment (if applicable)
  • Additional applicable testing (Pressure, Dimensional, Radiography, Magnetic Particle, and Liquid Penetrant Testing)