Below is a sample MTR, often called a mill test report or material test report. This guide of how to read important MTR documents includes an explanation of each relevant field. Manufacturers, inspectors, and customers should be able to easily identify and understand these fields. This will ensure the validity and conformity of materials and their proper application.
Sample MTR Fields
The sample MTR contains eight (8) main fields. Read more about each field below.
#1 – Material Heat Number
A material heat number is the main method of traceability for a given material. When comparing an MTR with raw materials, the corresponding heat number must be matched. This includes accompanying paperwork and marking on the surface of the material itself.
#2 – Material Grade (not pictured)
The material grade classifies various metals by their composition and physical properties. In the sample MTR, we can see that the material is 316/316L stainless steel.
#3 – Product Specifications Met
Product specifications refer to the ASTM and ASME standards applied to a given material. For example, metals used in pressure and vacuum applications have to meet specific product specifications. ASTM standards have a prefix including the letter “A”. Standards from the ASME have a “SA” prefix.
#4 – Material Dimensions
A material’s size and dimensions will be included on an MTR and displayed as material dimensions. This will change depending on the raw material. For example, metal plates are measured in thickness, while pipes are measured in diameter. In the sample MTR, the material is plate and labelled by thickness, width, weight, and length.
#5 – Mechanical Properties
Mechanical properties are specific tolerances a material has when used in specific applications. If a material falls within the outlined tolerances, it can be used. If the specification extends beyond those tolerances, it cannot.
#6 – Chemical Analysis
Chemical Analysis, like mechanical properties, refers to a specific chemical makeup that certifies a material can be used for a given application without risk of failure.
#7 – Heat Treatment (not pictured)
Heat treatment refers to a specific process of heating or cooling, usually to extreme temperatures, a material undergoes. The reviewer will identify all processes in the product specification and confirm details are accurate. In the sample MTR, the solution has a minimum arrival temp of 1900F and was water quenched.
#8 – Certified Mill Signature
The certified mill signature is provided by the responsible employee at the source mill. The employee signs to certify that the information is accurate.
Want more information on MTRs? Please visit the Encompass Solutions MTR FAQ page.
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