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SAE 1018 Steel Properties

Component    Wt. % 


C 0.14 - 0.2 
Fe 98.81 - 99.26 
Mn 0.6 - 0.9 
P Max 0.04 
S Max 0.05 


Material Notes:
Supplied as killed, semikilled, rimmed, and capped steel. Good weldability, relatively soft and strengthen with cold work during forming or drawing. Widely used in cold forming operations such as heading, upsetting, and extrusion. Used in the as-rolled condition as bar, shapes, sheet, and strip.


Physical Properties Metric English Comments


Density 7.87 g/cc 0.284 lb/in³  Typical for steel

Mechanical Properties


Hardness, Brinell 131 131 
Hardness, Knoop 150 150  Converted from Brinell hardness.
Hardness, Rockwell B 73 73  Converted from Brinell hardness.
Hardness, Vickers 136 136  Converted from Brinell hardness.
Tensile Strength, Ultimate 450 MPa 65300 psi 
Tensile Strength, Yield 380 MPa 55100 psi 
Elongation at Break 16 % 16 %  in 50 mm
Reduction of Area 40 % 40 % 
Modulus of Elasticity 200 GPa 29000 ksi  Typical for steel
Bulk Modulus 140 GPa 20300 ksi  Typical for steel
Poisson's Ratio 0.29 0.29  Typical For Steel
Shear Modulus 80 GPa 11600 ksi  Typical for steel

Electrical Properties


Electrical Resistivity 1.59e-005 ohm-cm 1.59e-005 ohm-cm  annealed condition; 0°C (32°F)
Electrical Resistivity at Elevated Temperature 2.19e-005 ohm-cm 2.19e-005 ohm-cm  annealed condition; 100°C (212°F)
Electrical Resistivity at Elevated Temperature 2.93e-005 ohm-cm 2.93e-005 ohm-cm  annealed condition; 200°C (390°F)

Thermal Properties


CTE, linear 20°C 11.5 µm/m-°C 6.39 µin/in-°F  Typical steel
CTE, linear 250°C 12.2 µm/m-°C 6.78 µin/in-°F  Typical for steel ; 0-300°C (68-570°F)
CTE, linear 500°C 13.9 µm/m-°C 7.72 µin/in-°F  Typical for steel ; 0-500°C (68-930°F)
CTE, linear 1000°C 14.7 µm/m-°C 8.17 µin/in-°F  Typical steel
Specific Heat Capacity 0.486 J/g-°C 0.116 BTU/lb-°F  annealed; 50-100°C (122-212°F)
Thermal Conductivity 51.9 W/m-K 360 BTU-in/hr-ft²-°F  Typical steel





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