ITEM | Standard Number | Descriptions |
1 | GB/T 11251 (2009) | Hot-rolled alloy structural steel plates |
2 | GB/T 17396 (2009) | Hot-rolled seamless steel tubes for hydraulic pillar service |
3 | GB/T 3077 (1999) | Alloy structure steels |
4 | GB/T 3078 (2008) | Quality structural steel cold drawn bars |
5 | GB/T 8162 (2008) | Seamless steel tubes for structural purposes |
Elements | Min.(≥) | Max.(≤) |
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 |