Chemical Composition Mechanical Properties

Carbon C: 0.17 ~ 0.22%
  
  
Si Si: ≤0.35%
Manganese Mn: 0.3 ~ 0.7%
Sulfur S: ≤0.045%
Phosphorus P: ≤0.045%
Chromium Cr: to allow the residual content ≤0.030%
Ni: to allow the residual content ≤0.030%
Cu: to allow the residual content ≤0.030%
NOTE: deoxidation method: F, b, Z
Tensile strength MPa: 375 ~ 460
Yield strength MPa: ≥235
Elongation (%): ≥26

Quality carbon structural steel

① two digits of the beginning of the steel carbon content of steel, with an average carbon content of the very few that, for example, the average carbon content of 0.45% steel, steel number "45", it is not a sequence number, it can not be read as No. 45 steel.
② high manganese content of high-quality carbon structural steel, manganese should be marked, for example 50Mn.
③ boiling steel, semi-killed steel and special-purpose high-quality carbon structural steel should last particularly marked in the steel, such as the average carbon content of 0.1% of the semi-killed steel, the steel is 10b.
④ quality carbon structural steel is based on the chemical composition and mechanical properties of supply. Less sulfur content in the steel, phosphorus and non-metallic inclusions, indicating quality, better performance uniform organizational structure, commonly used in the need to go through all kinds of heat treatment of the more important parts of the mechanical structure.
⑤ Depending on the chemical composition of high-quality carbon structural steel is divided into ordinary manganese content of steel and high manganese content of steel categories.