Carbon steel
Carbon steel contains no more than 0.4% to 0.6% copper, no more than 1.6% manganese, and no more than 0.6% silicon, with no other alloying elements added. Carbon steel is categorized as low carbon steel, medium carbon steel, and high carbon steel.
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Common grades: GB/T 700, ASTM A36, ASTM A572
Forged steel
Forging steel is the process of making it plastic while it is in the solid state. The forging process can make the crystal structure uniform, eliminate pores and bubbles, and improve the overall strength.
Common grades: ASTM A182 F316、ASTM 4140
High-strength low-alloy steel
High Strength Low Alloy Steel (HSLA) has good mechanical properties and corrosion resistance, making it more popular than carbon steel. It contains up to 2.0% manganese, as well as small amounts of chromium, nickel, molybdenum, nitrogen, vanadium, niobium and titanium, which form a protective film on the surface and are very corrosion-resistant.
Common grades: ASTM A606，ASTM A715
