Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
Mo
P
S
Si
0.35-0.40
0.70-0.90
0.20-0.30
<=0.030
<=0.040
0.15-0.35
More data from SAE J404:2000
From the standard
Other composition limitsfrom Table 1 and its notes
UNS number
G40370
Values
Ladle analysis; P and S are maximum limits
Incidental elements
Cu 0.35, Ni 0.25, Cr 0.20, Mo 0.06 (percent max, for elements not specified or required)
Elements to be reported
Aluminum, titanium, niobium (columbium) and vanadium, whether specified or not; a result below 0.008% may be reported as <0.008%
Product scope
Billets, blooms, slabs, plates, wire rods, and hot rolled and cold finished bars
Not covered
Structural shapes; hot and cold rolled sheet and strip (see ASTM A 506 and A 507); seamless and welded mechanical tubing (see ASTM A 513 and A 519)
Limits are subject to the standard variations in check analysis of SAE J409. Lead (0.15 to 0.35%, letter L between the second and third digits, for example 51L40) can be added to improve machinability.
Source: SAE J404:2000, Table 1 and its notes
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