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B7M

Alias

ASTM A193
B7M

Chemistry

Alloy Steel/Stainless Steel
Base Element Fe(Iron)

Element Min Max
C (Carbon) 0.37% 0.49%
Cr (Chromium) 0.75% 1.2%
Mn (Manganese) 0.65% 1.1%
Mo (Molybdenum) 0.15% 0.25%
P (Phosphorus) 0.035%
S (Sulphur) 0.04%
Si (Silicon) 0.15% 0.35%
Mechanical Properties Min Max
Ultimate Tensile Strength (UTS) 690 MPa
0.2% Proof Stress 550 MPa
Elongation 18%
Reduction of Area 18%
Gauge Length A4D
hardness (Brinell) 235 HB
Hardness (Rockwell B) 99 HRB

Uses

Bolting for pressure vessels, valves, flanges and fittings for high temperature or high pressure services or other special purpose applications.

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