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ASTM A320 L7

Alias

ASTM A320 L7
ASTM A320
L7
42CrMo4
1.722540 CD4

Chemistry

Alloy Steel/Stainless Steel
Base Element Fe(Iron)

Element Min Max
C (Carbon) 0.38% 0.48%
Cr (Chromium) 0.8% 1.1%
Mn (Manganese) 0.75% 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 725 MPa
Elongation 16%
Reduction of Area 50%
Gauge Length A50mm
Hardness (Brinell) 321 HB
Hardness (Rockwell C) 35 HRC

Uses

Bolting for pressure vessels, valves, flanges and fittings for low-temperature services.

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