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B7

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Alias

B7
ASTM A193
UNS S30400

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) 860 MPa
0.2% Proof Stress 720 MPa
Elongation 16%
Gauge Length A4D
Hardness (Brinell) 321 HB
Hardness (Rockwell C) 35 HRC

Uses

Bolting for pressure vessels, valves, flanges and fittings for high temperature or high pressure services.

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