SAE 1080

CHEMICAL COMPOSITION

Fe: 98.0-99.0

C: 0.75-0.88

Mn: 0.60-0.90

S: ≤0.05

P: ≤0.04

MECHANICAL PROPERTIES

Tensile strength: approximately 650 - 880 MPa

Yield strength: approximately 350 - 550 MPa

Elongation: about 8% - 25%

Fatigue strength: about 300 - 360 MPa

Young's modulus: approximately 190 - 200 GPa

Hardness: Brinell hardness is approximately 220 - 260

PHYSICAL PROPERTIES

Thermal expansion coefficient (Thermal expansion): 11.0-14.7 microns/meter·K (10^-6/K) in the temperature range of 20-700°C.

Thermal conductivity:

At 0°C, the thermal conductivity is approximately 50.5 W/m·K, At 200°C, the thermal conductivity is approximately 46.8 W/m·K.

Specific heat: In the temperature range of 50-400°C, 486 J/Kg·K - 599 J/Kg·K.

Resistivity: At 20°C, the resistivity is approximately 0.18 μΩ·m.

Melting temperature: 1450-1510°C.

Density: 7700 kg/m³

HEAT TREATMENT

Normalizing: usually performed at 830°C (1525°F)

Annealing: performed at 790-845°C (1450-1550°F)

Quenching: Heating to 815°C (1500°F) and then quenching with water or oil

Tempering: The quenched steel is tempered in the temperature range 205-650°C (400-1200°F)

FORGING

Typical forging temperature is 1205°C (2200°F)