Chemical composition and mechanical properties of hollow structure tube in agricultural machinery

Chemical composition of hollow structure tube in agricultural machinery：

C：0.24～0.32
Si：1.10～1.40
Mn：1.10～1.40
P：≤0.035
S：≤0.035
Cu：≤0.30
Cr：≤0.30
Ni：≤0.30
Mo：≤0.15

Mechanical properties of hollow structure tube in agricultural machinery：
Sample blank size (mm): 25
Tensile strength (σb/MPa): ≧980
Yield point (σs/MPa): ≧835
Elongation after break (δ5/%): ≧12
Area shrinkage (ψ/%): ≧40
Impact absorption work (Aku2/J): ≧39
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≦217