Alloy Steel 4340 | 1.6511 | 36CrNiMo4 | EN24 | CNC machining service | Custom Alloy Steel 4340 | 1.6511 | 36CrNiMo4 | EN24 parts

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CNC Machining Service for Alloy steel 4340 | 1.6511 | 36CrNiMo4 | EN24

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Material type

Metal
Material name

Alloy steel 4340 | 1.6511 | 36CrNiMo4 | EN24
Alternative names

30CrNiMo8, 1.658
Process compatibility

CNC machining

Mechanical properties

Ultimate tensile strength

690 - 1080 MPa

Yield strength

470 - 630 MPa

Young's modulus (modulus of elasticity)

205 - 213 GPa

Elongation at break

15 - 22 %

Physical properties

Corrosion resistance

Moderate to Poor

Magnetism

Semi-Magnetic

UV resistance

Excellent

Weldability

Moderate

Thermal properties

Maximum service temperature

613 - 652 °C

Thermal expansion coefficent

11.5 - 13 10^-6/ºC

Thermal conductivity

35 - 50 W/(m⋅°C)

Electrical properties

Electrical resistivity

18 - 27 μΩ*cm

Post treatments

Post-Processing

Tempering & Annealing

Anodizing compatibility

Not suitable

Common applications

General engineering parts

Connecting rods & bolts

High tensile applications

Alloy Steel 4340 (1.6511 | 36CrNiMo4 | EN24) CNC Machining Applications & Parts

Alloy Steel 4340 is a high-strength, low-alloy steel renowned for its exceptional toughness, fatigue strength, and good wear resistance, especially after heat treatment. We specialize in machining this robust material for the most demanding applications.

Typical Parts We Machine from Alloy Steel 4340:

Aerospace & Defense: Landing gear components, helicopter rotor shafts, high-strength bolts
Oil & Gas: Drill collars, tool joints, heavy-duty axles and shafts
Tooling & Molds: Die casting molds, plastic injection molds, heavy-duty fixtures

Our Machining Advantage:

Our capability to machine 4340 in both annealed and pre-hardened conditions (up to ~40 HRC) allows us to deliver ready-to-use components or precise preforms for final heat treatment.

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