Carbon steel means less than 1.35% carbon, iron, carbon, and within the limits of silicon, manganese, phosphorus, sulfur and other impurities, the steel without other alloying elements. Depends on the performance of carbon steel carbon content. Carbon content increased, 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, performance, range, the largest amount. For nominal pressure PN ≤ 32.0MPa, temperature of -30-425 ℃ water, steam, air, hydrogen, ammonia, nitrogen and petroleum products and other media. Common brands are WC1, WCB, ZG25 and high quality steel and low alloy structural steel 20,25,30 16Mn
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     Divided by the low carbon steel (carbon content of 0.04% to 0.25%), medium carbon steel (carbon content of 0.25% ~ 0.6%), high-carbon steel (carbon content of 0.6% to 1.35%).
     According to quality into ordinary carbon steel, its harmful impurities phosphorus, sulfur content of less than 0.05%, including the CPI steel (A type of steel, to ensure that the mechanical properties), (B) steel (B class steel, to ensure that the chemical composition) and special type of steel (C class steel, to ensure that the mechanical properties and chemical composition) - such as: Q235A, Q235B, A235C, Q235D, SS400, etc.; quality carbon steel, harmful impurities, phosphorus, sulfur content of less than 0.04%; high quality carbon prime steel, harmful impurities phosphorus, sulfur content of less than 0.03% - such as: 45, S50C, S45c, P20, and so on.
     According to use and into carbon structural steel and carbon tool steel, the former is mainly used in the manufacture of structural parts and machine parts in general is a low-carbon steel and carbon steel; the latter for the manufacture of cutting tools, measuring tools, molds, etc., generally a high carbon steel.
Carbon steel yield strength of structural steel in accordance divided into five grades:
Q195, Q215, Q235, Q255, Q275
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Quality carbon structural steel AISI1015