34CrAlNi7-10
Alloy Steel34CrAlNi7-10
Aluminum-nickel nitriding steel (DIN).
Chemical Composition (%)
| C | 0.3 |
|---|---|
| SI | 0.4 |
| MN | 0.4 |
| NI | 0.8 |
| CR | 1.5 |
| MO | 0.15 |
| AL | 0.8 |
Mechanical Properties
Tensile Strength:≥900 MPa;Yield Strength:≥700 MPa;Elongation:≥14%
Equivalent Standards
~AISI 6470E mod
Equivalent Grades
DIN 34CrAlNi7-10 / EN 1.8550
Applications
Nitrided shafts, cylinders.
Available Forms
Bar, Forging
Uses
Nitriding steel that develops an extremely hard, wear- and corrosion-resistant surface after nitriding with minimal distortion. Aluminium (≈0.95%) forms hard AlN nitrides, giving the highest surface hardness. Used for crankshafts, cylinder liners, screws, valves, die blocks and precision machine components.
Heat Treatment
Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance. Quench & temper first to ≈30–40 HRC, then gas/nitride at 480–540 °C for 10–60 h; no further quench needed — minimal distortion.
Precautions
Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating). Machine the core stock before surface hardening; leave grinding allowance for the hardened case.
Comments 0