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Material type
Metal
Material name
Alloy steel 4140 | 1.7225 | EN19 | 42CrMo4
Alternative names
42CrMo4, 1.7225
Process compatibility
CNC machining
AISI 4140 is low alloy steel with chromium and molybdenum content ensuring reasonable strength. Moreover it has good atmospheric corrosion resistance. It is widely used in many industries due to its excellent properties.
Mechanical properties
Ultimate tensile strength
355 - 370 MPa
Yield strength
230 MPa
Young's modulus
(modulus of elasticity)
(modulus of elasticity)
208 - 216 GPa
Elongation at break
18 - 26 %
Physical properties
Corrosion resistance
Moderate to Poor
Magnetism
Semi-Magnetic
UV resistance
Excellent
Weldability
Moderate
Thermal properties
Maximum service temperature
613 - 650 °C
Thermal expansion coefficent
11.5 - 13.5 10^-6/ºC
Thermal conductivity
42 - 48 W/(m⋅°C)
Electrical properties
Electrical resistivity
20 - 25 μΩ*cm
Post treatments
Post-Processing
Tempering & Annealing
Anodizing compatibility
Not suitable
Common applications
Heavy duty shafts
Connecting rods
High tensile bolts