AISI-SAE Standard Carbon Steels Composition
Free-Machining Grades Table — Resulfurized

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Free machining steel is steel that forms small chips when machined. This increases the machinability of the material by breaking the chips into small pieces, thus avoiding entanglement in the machinery. This enables automatic equipment to run without human interaction. Free machining steel with lead also allow for higher machining rates. Free machining steel costs 15 to 20% more than a standard steel, but this is made up by increased machining speeds, larger cuts, and longer tool life.

The disadvantages of free machining steel are: ductility is decreased; impact resistance is reduced; copper-based brazed joints suffer from embrittlement with bismuth free machining grades; shrink fits are not as strong.

AISI-SAE
Number
UNS
Number
Composition
C
Mn
P(max)**
Nonresulfurized Grades - Over 1 per cent Mn
Free-Machining Grades — Resulfurized
1110 G11100 0.08–0.13 0.30–0.60 0.040 0.08–0.13
1117 G11170 0.14–0.20 1.00–1.30 0.040 0.08–0.13
1118 G11180 0.14–0.20 1.30–1.60 0.040 0.08–0.13
1137 G11370 0.32–0.39 1.35–1.65 0.040 0.08–0.13
1139 G11390 0.35–0.43 1.35–1.65 0.040 0.13–0.20
1140 G11400 0.37–0.44 0.70–1.00 0.040 0.08–0.13
1141 G11410 0.37–0.45 1.35–1.65 0.040 0.08–0.13
1144 G11440 0.40–0.48 1.35–1.65 0.040 0.24–0.33
1146 G11460 0.42–0.49 0.70–1.00 0.040 0.08–0.13
1151 G11510 0.48–0.55 0.70–1.00 0.040 0.08–0.13

* Material used in wire rods and wire only.
** Values given are maximum percentages, except where a range of values is given.

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