SAE 1045 Steel Properties

Summary:SAE 1045 Steel Properties

Component    Wt. %  

C 0.42 - 0.5 

Fe 98.51 - 98.98 

Mn 0.6 - 0.9 

P Max 0.04 

S Max 0.05 

Material Notes:

Medium-carbon steel, can be hammer forged. Can be heat treated, flame or induction hardened, but not recommended for carburizing or cyaniding. AISI cross reference for JIS S45C and KS SM45C. 

Physical Properties Metric English Comments 

Density 7.85 g/cc 0.284 lb/in3  

Mechanical Properties 

Hardness, Brinell 179 179 

Hardness, Knoop 200 200  Converted from Brinell hardness.

Hardness, Rockwell B 88 88  Converted from Brinell hardness.

Hardness, Vickers 188 188  Converted from Brinell hardness.

Tensile Strength, Ultimate 625 MPa 90600 psi 

Tensile Strength, Yield 530 MPa 76900 psi 

Elongation at Break 12 % 12 %  In 50 mm

Reduction of Area 35 % 35 % 

Modulus of Elasticity 205 GPa 29700 ksi  Typical for steel

Bulk Modulus 140 GPa 20300 ksi  Typical for steel

Poisson's Ratio 0.29 0.29  Typical For Steel

Machinability 55 % 55 %  Based on AISI 1212 steel. as 100% machinability

Shear Modulus 80 GPa 11600 ksi  Typical for steel

Electrical Properties 

Electrical Resistivity 1.62e-005 ohm-cm 1.62e-005 ohm-cm  annealed specimen; 0°C (32°F)

Electrical Resistivity at Elevated Temperature 2.23e-005 ohm-cm 2.23e-005 ohm-cm  annealed specimen; 100°C (212°F) 

Thermal Properties 

CTE, linear 20°C 11.5 μm/m-°C 6.39 μin/in-°F  0-100oC

CTE, linear 250°C 13 μm/m-°C 7.22 μin/in-°F  0-300°C (68-570°F)

CTE, linear 500°C 14 μm/m-°C 7.78 μin/in-°F  0-500°C (68-930°F)

Specific Heat Capacity 0.486 J/g-°C 0.116 BTU/lb-°F  annealed; 50-100°C (122-212°F)

Specific Heat Capacity at Elevated Temperature 0.519 J/g-°C 0.124 BTU/lb-°F  annealed; 150-200°C (302-392°F)

Specific Heat Capacity at Elevated Temperature 0.586 J/g-°C 0.14 BTU/lb-°F  annealed; 350-400°C (662-752°F)

Thermal Conductivity 49.8 W/m-K 346 BTU-in/hr-ft2-°F  Typical steel

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