Bolt material：A193 B7
Alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications
Chemical composition:
| Chemical composition | C | Si | Mn | P | S | Cr | Mo |
| Min | 0.38 | 0.15 | 0.75 | - | - | 0.8 | 0.15 |
| Max | 0.48 | 0.35 | 1 | 0.04 | 0.04 | 1.1 | 0.25 |
Mechanical properties:
| d （mm) | Heat treatment | σb | σs | δ | ψ | HBW |
| Mpa | Mpa | % | % | |||
| d≤M64 | tempering℃ | ≥860 | ≥720 | ≥16 | ≥50 | ≤321 |
| ≥593 | ||||||
| M64＜d≤M100 | tempering℃ | ≥795 | ≥655 | ≥16 | ≥50 | ≤321 |
| ≥593 | ||||||
| M100＜d≤M180 | tempering℃ | ≥690 | ≥515 | ≥18 | ≥50 | ≤321 |
| ≥593 |
Approximate comparison table:
| China | USA | Japan | |
| GB | ASTM | AISI | JIS |
| 42CrMo | A193 B7 | 4140 4142 4145 |
SNB7 |
Bolt material：A193 B7
Alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications
Chemical composition:
| Chemical composition | C | Si | Mn | P | S | Cr | Mo |
| Min | 0.38 | 0.15 | 0.75 | - | - | 0.8 | 0.15 |
| Max | 0.48 | 0.35 | 1 | 0.04 | 0.04 | 1.1 | 0.25 |
Mechanical properties:
| d （mm) | Heat treatment | σb | σs | δ | ψ | HBW |
| Mpa | Mpa | % | % | |||
| d≤M64 | tempering℃ | ≥860 | ≥720 | ≥16 | ≥50 | ≤321 |
| ≥593 | ||||||
| M64＜d≤M100 | tempering℃ | ≥795 | ≥655 | ≥16 | ≥50 | ≤321 |
| ≥593 | ||||||
| M100＜d≤M180 | tempering℃ | ≥690 | ≥515 | ≥18 | ≥50 | ≤321 |
| ≥593 |
Approximate comparison table:
| China | USA | Japan | |
| GB | ASTM | AISI | JIS |
| 42CrMo | A193 B7 | 4140 4142 4145 |
SNB7 |
