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AISI 12L14 low carbon leaded free cutting steel, bright drawn or smooth turned with a consistently excellent level of machinability. The lead improves machinability greatly with little effect on the mechanical properties.
Typical Applications: very heavily machined components or parts subject to low stress levels, low shock loading, limited forming and very limited welding.
| Weight % | C | Mn | P | S | Pb | Fe |
|---|---|---|---|---|---|---|
| minimum | — | 0.85 | 0.040 | 0.26 | 0.15 | 97.91 |
| maximum | 0.15 | 1.15 | 0.090 | 0.35 | 0.35 | 98.7 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.284 lbs/in3 | 7.87 g/cm3 | |
| Specific heat | Typical Steel | 0.113 BTU/lb – °F | 472 J/KG- °K |
| Coefficient of thermal
expansion |
-32°F-68°F
0°C -20°C |
6.39 micro in/in- °F | 11.5 micro m/m- °K |
| -32°F – 572°F
0°C – 300°C |
6.78 micro in/in- °F | 12.2 micro m/m- °K | |
| -32°F – 932°F
0°C – 500°C |
7.72 micro in/in- °F | 13.9 micro m/m- °K | |
| Thermal conductivity | Typical Steel | 30.0 Btu / ft-hr-°F | 51.9 W/m – °K |
| Electrical resistivity | Typical Steel | 174 nΩ ∙ m | |
| Condition | Tensile | Hardness | Average machinabillity | |||||
|---|---|---|---|---|---|---|---|---|
| Ultimate strength | Yield
strength |
Elongation
in 50 mm (2 in.), |
Reduction
in area, |
HRB | % of steel 1212 = 100% | |||
| KSI | MPa | KSI | MPa | % | % | Min | % | |
| Hot rolled | 57 | 390 | 34 | 230 | 22 | 45 | 121 | — |
| Cold drawn | 78 | 540 | 60 | 410 | 10 | 35 | 163 | 170 |
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