ASTM A-572 Grade 50
HSLA columbium-vanadium steel with a higher yield and tensile strength as compared to ASTM A-36. It is used in bridges, buildings, construction equipment, freight cars, machinery, truck parts, and other applications. These stronger steels permit the reduction of section thickness and weight, providing added payload capacity in transportation applications as well as material cost savings. ASTM A-572 Grade 50 is weldable, formable, and machinable when using appropriate techniques.
For Grade 50, the minimum yield point is 50,000 psi and the minimum tensile strength is 65,000 psi. Shapes over 426 lbs. per foot are silicon killed to insure uniform properties.
HSLA steel containing small additions of copper, chromium and nickel. For use in bridges, buildings, freight cars, construction equipment, smoke-stack liners, precipitators, transmission towers, and light poles where savings in weight and/or added durability are important. The atmospheric corrosion resistance of this steel is a minimum of four times that of regular carbon steel. These steels are often used unpainted and develop a weathered orange-brown surface that is resistant to corrosion. ASTM A-588 Grade A is weldable, formable, and machinable when using the appropriate techniques. The minimum yield point is 50,000 psi and minimum tensile strength is 70,000 psi. All sizes of ASTM A-588 are silicon killed.
A structural steel containing small additions of vanadium or columbium, copper, nickel, chrome, and molybdenum. This specification covers structural shapes intended for use in building framing or bridges. The major advantage of A-992 is its better material definition. It has an upper limit on yield strength of 65 ksi, a minimum tensile strength of 65 ksi, a specified maximum yield-to-tensile ratio of 0.85 and a specified maximum carbon equivalent of 0.47%. This last property translates into excellent weldability. In most cases it can be dual certified to A-572 grade 50.
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