What is a Mill Test Report (MTR)? 

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)