What is 30# carbon steel

Compared with low-carbon steel, 30# carbon steel has higher strength and hardness, better toughness, and weldability. 30# carbon steel is usually used in normalized state, and it can also be quenched and tempered.

30# carbon steel chemical composition: Carbon (C) 0.27-0.34, Manganese (Mn) 0.50-0.80, Nickel (Ni)≤0.30, Silicon (Si) 0.17-0.37, Phosphorus (P)≤0.035, Sulfur (S)≤ 0.035, Chromium (Cr) ≤ 0.25, Copper (Cu) ≤ 0.25.

30# carbon steel mechanical properties:
Tensile strength σb (MPa)≥490,
Yield strength σs (MPa)≥295,
Elongation δ5 (%)≥21,
Reduction of area ψ (%)≥50,
Impact energy Akv (J)≥63,
Hardness: unheated ≤179HB.

30# carbon steel is suitable for hot forging, hot pressing and cutting processing to manufacture parts with small cross-sections and low stress, working temperature≤150℃, such as screw rods, tie rods, shaft keys, rings, gears, sleeves, etc. .