The A690/A690M-13a steel grade is a high-strength low-alloy (HSLA) structural steel that is commonly used in construction and infrastructure projects. It has a minimum yield strength of 690 MPa (100 ksi) and a minimum tensile strength of 760-895 MPa (110-130 ksi).
The chemical composition of A690/A690M-13a steel grade is as follows:
– Carbon (C): 0.10% max
– Manganese (Mn): 1.00-2.00%
– Phosphorus (P): 0.030% max
– Sulfur (S): 0.030% max
– Silicon (Si): 0.15-0.50%
– Vanadium (V): 0.06% max
– Nitrogen (N): 0.015% max
– Copper (Cu): 0.10% max
– Nickel (Ni): 0.40% max
– Chromium (Cr): 0.30-1.00%
– Molybdenum (Mo): 0.10% max
These specifications ensure that the steel grade has good weldability, formability, and toughness, while maintaining its high strength properties.
In terms of mechanical properties, the A690/A690M-13a steel grade exhibits excellent strength and toughness. The minimum yield strength of 690 MPa (100 ksi) and minimum tensile strength of 760-895 MPa (110-130 ksi) make it suitable for demanding structural applications. Additionally, it has a high elongation of 19% min, which indicates good ductility.
The A690/A690M-13a steel grade is specified by the ASTM A690/A690M standard. This standard provides the requirements for the design, manufacture, and testing of high-strength low-alloy steel shapes, plates, and bars for use in welded bridges, buildings, and other structures.
Overall, the A690/A690M-13a steel grade offers a combination of high strength, good weldability, formability, and toughness, making it suitable for various structural applications.