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
Mo
0.45-1.00
0.10-0.90
<=0.030
<=0.030
0.10-0.50
0.70-1.20
0.10-0.30
<=0.25
Mechanical Properties
Hardness
<=197 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
197
Cold drawn
241
Maximum Brinell hardness (BHN).
Source: A681:2008, Table 2
Heat treatment and response to hardeninghardening test conditions
Preheat temperature
1200 deg F (649 deg C)
Austenitizing, salt bath
1575 deg F (857 deg C)
Austenitizing, controlled atmosphere furnace
1600 deg F (871 deg C)
Austenitizing time
5 to 15 min
Quench medium
Oil
Tempering temperature
400 deg F (204 deg C)
Minimum hardness after treatment
53 HRC
Austenitizing temperatures are stipulated for the response to hardening test only. Minimum hardness 53 HRC applies to the 0.45 to 0.55 percent carbon type.
Source: A681:2008, Table 3
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