Metals Strength vs. Temperature

The influence of temperature on the strength of metals including bronze, copper, structural steel, casting steel, cast iron, wrought iron, and stainless steel (304N)

Metal Type	Temperature (°C)	Strength Reduction (%)	Strength (MPa)
Bronze	20	100
Bronze	100	95
Bronze	200	90
Copper	20	100	220
Copper	100	95	209
Copper	200	85	187
Structural Steel	20	100
Structural Steel	100	98
Structural Steel	200	100
Casting Steel	20	100
Casting Steel	100	97
Casting Steel	200	100
Cast Iron	20	100
Cast Iron	100	95
Cast Iron	200	85
Wrought Iron	20	100
Wrought Iron	100	98
Wrought Iron	200	95
Stainless Steel (304N)	20	100
Stainless Steel (304N)	100	96
Stainless Steel (304N)	200	92

Key Information

Most ferrous metals have their maximal strength at about 200 °C (400 °F)
Modulus of elasticity decreases gradually with increased temperature until it rapidly falls off
The strength of copper is reduced to approximately 95% at 100 °C

Example - Strength of Copper at 100 °C

With an Ultimate Tensile Strength (σu) of 220 MPa for copper:

Strength reduction at 100 °C: 95%
Reduced strength: 0.95 × 220 MPa = 209 MPa

Metals Strength vs. Temperature | MEPKit Engineering Tools | MEPKit