A certified Material Test Report (MTR) or Mill Certificate for A36 steel provides traceability and proof of compliance. Key information includes:
Material Identification: Grade (ASTM A36), product form (H-Beam), size, heat number, and lot/batch number.
Heat (Chemical) Analysis: 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.
Mechanical Test Results:
Yield Strength (MPa/psi): The actual measured value, which must meet or exceed 250 MPa.
Tensile Strength (MPa/psi): The actual measured value, which must fall between 400-550 MPa.
Elongation (%): The actual measured percentage in a specified gauge length (e.g., 200mm), which must meet or exceed 20%.
Test Details: Identification of the sample (location from the product, orientation), the test method standard used (e.g., ASTM A370), and the date of testing.
Additional Tests (if specified): 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.