ASTM A1043 Standard Specification for Structural Steel with Low Yield to Tensile Ratio for Use in Buildings

Get Certified ASTM A1043 Testing for Reliable Structural Steel Performance

The ductility of structural steel is directly related to the yield-to-tensile ratio, which in turn is related to the seismic performance of the building frame. ASTM A1043 testing establishes a steel shape ratio of 0.80 or less and defines chemical and mechanical properties of steel shapes and plates. Reputable laboratory testing provides reliable and repeatable information to help with quality control, material specifications, and compliance checks. Testing ensures consistency among manufacturers and supports the selection of the ductility properties required for steel framing applications. 

The scope of ASTM A1043 includes:

• Material type: This is the ASTM A1043 specification for rolled steel structural shapes and plates with flange width 6 in. Shapes [150 mm] and up, and thickness up to 5 in. [125 mm] for plates.
• Purpose: The specification is intended to supply steel with a low yield-to-tensile strength ratio for use in building framing where increased ductility and inelastic behavior are required.
• Properties measured: The specification sets the chemical composition limits for carbon, manganese, phosphorus, sulfur, silicon, nitrogen, nickel, chromium, molybdenum, copper, vanadium, columbium, and titanium. Mechanical properties include yield point, tensile strength, elongation, and yield-to-tensile ratio.
• Method: The specification specifies killed steel, includes heat analysis requirements, and includes product analysis requirements. Tension tests measure yield point, tensile strength, and elongation.
• Result: The testing laboratory measures chemical composition and mechanical properties from the specimens it tests.
• Test Limitations: The numbers given in inch-pound units or in SI units are to be considered separately as standard. Combining values from the two systems may result in nonconformance with the standard.
• Environmental conditions: The test program includes standard laboratory conditions for mechanical testing and chemical analysis as part of environmental conditions. 
• Applications: ASTM A1043 applies to building framing, seismic-resistant structures, and general structural applications that require a low yield-to-tensile strength ratio. 

What are the Uses of ASTM A1043?

ASTM A1043 testing verifies the chemical composition and mechanical properties of structural steel shapes and plates. Manufacturers and engineers use these results for quality control, material selection, and compliance verification.

This standard-

• Confirming limits of chemical composition for carbon, manganese, phosphorus, sulfur, and other specified elements
• Verification of Yield point, Tensile strength, elongation, and yield-to-tensile ratio specifications
• Supporting material certification for building framing applications 
• Quality control for steel products such as steel shapes and plates
• Supporting engineers in choosing steel with ductility properties for seismic design purposes
• Documenting structural steel requirements for procurement and compliance with specifications

Which materials can be tested under ASTM A1043?

ASTM A1043 is used for rolled steel structural shapes having a flange width of 6 in. Plates up to 5 in. (150 mm thick. [125 mm] thick. This specification applies to two grades, 36 [250] and 50 [345], for building framing or general structural applications. 

Why is ASTM A1043 Important?

Structural steel requires a low ratio of the yield to tensile strength, which is important for the ductile behavior of building frames, and ASTM A1043 offers a standardized specification for steel with this quality. The requirement of 0.80 or less for the yield-to-tensile ratio gives a significant amount of strain hardening before failure. Serves the design of building structure frames that allow inelastic deformation without early fracture to achieve seismic-resistant design and structural safety. The specification also includes additional requirements which the purchaser may invoke if further testing or restrictions are required. 

ASTM A1043 Testing Process and Data Collection

The testing process starts with the preparation of steel shape or plate specimens with standard dimensions. Chemical analysis by technicians is used to confirm that heat and product analyses meet the required chemical composition limits. The technicians perform tension tests on the material to determine elongation, tensile strength, and yield point. The analyst measures the yield-to-tensile ratio to ensure that it is below the maximum of 0.80 indicated. All test data are captured in the data acquisition system, and a compliance certification is generated according to ASTM A1043.

Common Challenges and Troubleshooting in ASTM A1043

Two key factors affect accurate ASTM A1043 results: specimen preparation and calibrated equipment. The specification demands that killed steel be supplied with a silicon content of 0.10% or greater, total aluminum content of 0.015% or greater, or titanium content of 0.006% or greater. Challenges include confirmation of chemical composition over the range of elements and precision in measuring yield point and tensile strength for ratio calculation. Specified dimension values given in inch-pound and SI are to be taken independently; they are not necessarily related and may lead to non-conformance if combined. A reliable result is obtained from laboratories that take care in specimen preparation, calibration of testing equipment, and compliance with the referenced general requirements specification A6/A6M.

• The laboratory compares chemical composition results for carbon, manganese, phosphorus, sulfur, silicon, nitrogen, nickel, chromium, molybdenum, copper, vanadium, columbium, and titanium to specified limits.
• The analyst documents the tensile test results for the test pieces, such as yield point, tensile strength, and elongation.
• The test report records the yield-to-tensile strength ratio, determined from the yield point and tensile strength, which must be equal to or below the maximum ratio of 0.80.
• Analysts confirm that the steel shape or plate conforms to the requirements for the listed grade.
• The report compares test results with the chemical composition and mechanical properties required for the appropriate grade under the standard.
• Producers assure their steel products meet the requirements in ASTM A1043. 

Link to ASTM A1043