A certified Material Test Report (MTR) or Mill Certificate for A36 steel provides traceability and proof of compliance. Key information includes:
Grade (ASTM A36), product form (H-Beam), size, heat number, and lot/batch number.
The actual measured percentages of the key elements (C, Mn, P, S, Si, Cu) from a sample taken during the steel melt, demonstrating compliance with the chemical requirements of ASTM A36.
The actual measured value, which must meet or exceed 250 MPa.
The actual measured value, which must fall between 400-550 MPa.
The actual measured percentage in a specified gauge length (e.g., 200mm), which must meet or exceed 20%.
Identification of the sample (location from the product, orientation), the test method standard used (e.g., ASTM A370), and the date of testing.
Results for any supplementary requirements called out in the purchase order, which are not part of the base A36 spec.
This certification is a legal document that provides assurance that the supplied material meets the ordered specification and is essential for quality assurance in critical construction projects.