Chemical Composition of A588 Grade K Weathering Steel

The chemical composition of A588 Grade K weathering steel is listed in Table 1. It is composed of specific high chromium, low alloy steel alloys and other elements.

Chemical composition of A588 Grade K.

Element % by weight
Carbon 0.15
Manganese 0.75 - 1.35
Phosphorous 0.04
Sulfur 0.05
Silicon 0.40 - 0.65
Chromium 0.40 - 0.70
Nickel 0.40
Copper 0.25
Molybdenum 0.20 - 0.30
Vanadium 0.02 - 0.10
Niobium 0.02 - 0.05

A588 Grade K is a high-strength, low-alloy weathering steel with improved atmospheric corrosion resistance. This grade of steel was created by the United States Steel Corporation and was patented in 1968.

A588 Grade K has a higher yield strength than normal steels and has improved corrosion resistance due to the combination of alloying elements. Its composition includes elements such as chromium, nickel, molybdenum, vanadium, and niobium, which improve its corrosion resistance. The combination of chromium and nickel produces a corrosion-resistant alloy, while molybdenum, vanadium, and niobium provide additional strength.

A588 Grade K steel is also highly resistant to atmospheric corrosion. The chromium content in the steel creates a thin layer of chromium oxide when exposed to rain and other elements. This protective layer helps to shield the steel from further rusting and weathering.

A588 Grade K is typically used in structures requiring high strength and excellent corrosion resistance in many applications such as bridges, power transmission towers, storage tanks, and other structures exposed to the elements. It is also suitable for welding, forming, and machining.

A588 Grade K steel is a versatile material for many applications and provides a combination of strength and corrosion resistance that makes it suitable for a wide range of projects. Its high strength and low cost make it an ideal choice for various applications. Its excellent corrosion resistance makes it a great choice for outdoor use or applications in harsh or corrosive environments. Over time, this steel develops a unique patina, adding character and charm to projects.