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
Mo
0.65-0.75
1.80-2.50
<=0.030
<=0.030
0.10-0.70
0.90-1.40
0.90-1.40
Mechanical Properties
Hardness
<=248 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
248
Cold drawn
262
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
1525 deg F (829 deg C)
Austenitizing, controlled atmosphere furnace
1550 deg F (843 deg C)
Austenitizing time
5 to 15 min
Quench medium
Air
Tempering temperature
400 deg F (204 deg C)
Minimum hardness after treatment
58 HRC
Austenitizing temperatures are stipulated for the response to hardening test only.
Source: A681:2008, Table 3
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