Quality carbon steel.

C: 0.22 ~ 0.28;
Si: 0.15 ~ 0.35;
Mn: 0.3 ~ 0.6;
P <0.03;
S <0.03
Carbon content less than 1.35%, in addition to iron, carbon, and within limits of silicon, manganese, phosphorus, sulfur and other impurities, excluding steel other alloying elements. Carbon steel is mainly dependent on the performance of the carbon content. Carbon content increases, the strength of steel, the hardness increases, ductility, toughness and weldability decrease. Compared with other types of steel, carbon steel using the first, low cost, wide performance range, the largest amount. For nominal PN≤32.0MPa, temperature of water, steam, air, hydrogen, ammonia, nitrogen and petroleum products, and other media -30-425 ℃'s.