SAE J403:2009 12L14: Rephosphorized and resulfurized free cutting carbon steel SAE 12L14 (UNS G12144) to SAE J403 DEC2009, a chemistry-only grade for semifinished products for forging, hot rolled and cold finished bars, wire rods and seamless tubing. Carbon up to 0.15% and manganese 0.85-1.15%.
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
Pb
S
<=0.15
0.85-1.15
0.04-0.09
0.15-0.35
0.26-0.35
More data from SAE J403:2009
From the standard
Other composition limitsfrom the table and its notes
UNS number
G12144
Product scope
semifinished products for forging, hot rolled and cold finished bars, wire rods and seamless tubing
Residual limits, Option A
Cu 0.20, Ni 0.20, Cr 0.15, Mo 0.06 max
Residual limits, Option B (default)
Cu 0.35, Ni 0.25, Cr 0.20, Mo 0.06 max
Residual limits, Option C
Cu 0.40, Ni 0.40, Cr 0.30, Mo 0.12 max
Residual limits, Option D
No limits, values reported
Silicon is not normally specified for the 12xx series because it harms machinability. Lead (0.15 to 0.35%, letter L) and boron (0.0005 to 0.003%, letter B) versions of the standard grades are identified by a letter between the second and third digits. Residual elements are agreed between purchaser and supplier; unless otherwise specified Option B applies. Option A applies to flat rolled products up to 1060.
Source: SAE J403:2009, Table 3B, rephosphorized and resulfurized free cutting carbon steels and its notes
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