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A193 B7

June 28, 2022

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