Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
P
S
Si
Cr
V
W
Mo
Co
0.32-0.45
0.20-0.50
<=0.030
<=0.030
0.15-0.50
4.00-4.75
1.75-2.20
3.75-4.50
0.30-0.55
4.00-4.50
Mechanical Properties
Hardness
<=241 HB
Condition
Annealed (maximum Brinell hardness)
More data from ASTM A681:2008
From the standard
Maximum hardness in delivery condition2 conditions
Condition
Maximum hardness (HB)
Annealed
241
Cold drawn
262
Maximum Brinell hardness (BHN).
Source: A681:2008, Table 2
Heat treatment and response to hardeninghardening test conditions
Preheat temperature
1450 deg F (788 deg C)
Austenitizing, salt bath
2150 deg F (1177 deg C)
Austenitizing, controlled atmosphere furnace
2175 deg F (1191 deg C)
Austenitizing time
5 to 15 min
Quench medium
Air
Tempering temperature
1025 deg F (552 deg C)
Minimum hardness after treatment
55 HRC
Austenitizing temperatures are stipulated for the response to hardening test only.
Source: A681:2008, Table 3
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