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
0.50-0.65
0.60-0.95
<=0.030
<=0.030
1.75-2.25
0.10-0.50
0.15-0.35
Mechanical Properties
Hardness
<=229 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
229
Cold drawn
255
Maximum Brinell hardness (BHN).
Source: A681:2008, Table 2
Heat treatment and response to hardeninghardening test conditions
Preheat temperature
1250 deg F (677 deg C)
Austenitizing, salt bath
1625 deg F (885 deg C)
Austenitizing, controlled atmosphere furnace
1650 deg F (899 deg C)
Austenitizing time
5 to 15 min
Quench medium
Oil
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
Active ASTM A681:2008 S4 Listings on M-EX (For Sale)