AISI 12L14 Steel Properties – SAE 12L14 Carbon Steel Equivalent Material

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SAE AISI 12L14 Steel Material

SAE AISI 12L14 steel is a resulfurized, rephosphorized and lead containing free-machining material, and is widely used in machinery, energy, metallurgy, aerospace and other fields.

The lower carbon content of 12L14 steel, especially the low melting point lead particles, ensures inherent lubrication of the steel during machining and embrittlement of the liquid metal at low machining speeds, thus avoiding the formation of Built-Up-Edge (BUE). In addition, phosphorus and sulfide inclusions form sources of stress concentration and discontinuities in the ferrite substrate, resulting in breakable chips. The sulfide-lubricated zone formed during machining reduces friction and tool wear, further improving its machinability. All these properties combine to make this material the most machinable of all common carbon and alloy steels. This machinability can be evaluated in terms of low cutting forces and good chip breaking characteristics.

Material 12L14 Steel Properties

12L14 material density is 7.87 g/cm³ (0.284 lb/in³); Tensile strength is 390 MPa (57 ksi) for hot rolled, 540 MPa (78 ksi) for cold rolled; Yield strength is 230 MPa (34 ksi) for hot rolled, 410 MPa (60 ksi) for cold rolled; Hardness is 121 HB (hot rolled), 163 HB (cold rolled).

Chemical Composition

Chemical Composition
Standard Steel C, ≤ Mn P S Pb
ASTM A29/A29M 12L14 0.15 0.85-1.15 0.04-0.09 0.26-0.35 0.15-0.35

12L14 Carbon Steel Mechanical Properties

Carbon Steel Type of Processing Tensile strength, MPa (ksi), ≥ Yield strength, MPa (ksi), ≥ Elongation % ≥ Reduction in area, % Hardness, HB Average machinability rating, %
12L14 Hot rolled 390 (57) 230 (34) 22 45 121
Cold drawn 540 (78) 410 (60) 10 35 163 170

Based on cold drawn 1212 carbon steel machinability rating = 100%.

Miscellaneous Material Properties

AISI SAE 12L14 Steel Properties Metric Imperial
Density 7.87 g/cm3 0.284 lb/in3
Specific heat capacity 472 J/kg·K 0.113 Btu/lb ·°F
Electrical resistivity 0.174 μΩ·m 6.85 μΩ·in
Elastic modulus (Modulus of Elasticity) 200 GPa 29 x 106 psi
Shear Modulus 80 GPa 11.6 x 106 psi
Coefficient of thermal expansion (CTE) 11.5×10-6/K at 20 °C 6.39 μin./in.·°F at 68 °F
12.2×10-6/K at 0-300 °C 6.78 μin./in.·°F at 32-572 °F
13.9×10-6/K at 0-500 °C 7.72 μin./in.·°F at 32-1000 °F
Poissons Ratio 0.29 0.29

SAE AISI 12L14 Steel Equivalent Material

SAE AISI 12L14 carbon steel equivalent material is listed in the table below, including US ASTM SAE, AISI; ISO, Japanese JIS, Chinese GB and European EN standard, etc.

AISI 12L14 Steel Equivalent Material
US European ISO German Japan China Australia India Rusia Korea
Standard Steel Grade Standard Steel Name (Material Number) Standard ISO Designation Standard Steel Name (Material Number) Standard Steel Grade Standard Steel Grade Standard Grade Standard Grade Standard Grade Standard Grade
AISI, SAE;
ASTM A29/A29M
12L14 EN ISO 683-4 :2018 10SPb20 (1.0722) ISO 683-4:2018 10SPb20 DIN EN 10087 (Withdrawn) 10SPb20 (1.0722) JIS G4804 SUM24L GB/T 8731 Y12Pb

Note: DIN EN 10087 has been replaced by DIN EN ISO 683-4.

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