AISI 4317 Alloy Steel | Properties, Applications & Supply | SAKYSTEEL
AISI 4317 Alloy Steel
AISI 4317 alloy steel is a low-alloy chromium-nickel-molybdenum steel, classified as a case hardening steel. At
SAKYSTEEL, we supply high-quality 4317 round bars and forged blocks tailored to engineering industries requiring excellent core strength and surface hardness after heat treatment.
Equivalent Grades
- DIN: 25CrMo4 / 1.6582
- JIS: SCM420H
- AFNOR: 25CD4
Chemical Composition (%)
| Element |
Min |
Max |
| Carbon (C) |
0.17 |
0.23 |
| Silicon (Si) |
0.15 |
0.35 |
| Manganese (Mn) |
0.60 |
0.90 |
| Chromium (Cr) |
0.90 |
1.20 |
| Nickel (Ni) |
1.30 |
1.70 |
| Molybdenum (Mo) |
0.15 |
0.30 |
Mechanical Properties (Typical After Heat Treatment)
- Tensile Strength: 850–1000 MPa
- Yield Strength: ≥ 650 MPa
- Elongation: ≥ 14%
- Impact Energy (KV): ≥ 35 J (at +20°C)
- Hardness: ≤ 229 HBW (annealed)
Key Features of AISI 4317
- Excellent hardenability and wear resistance
- Good tensile strength and fatigue resistance
- Suitable for carburizing or nitriding treatments
- Good machinability and weldability
Typical Applications
Thanks to its balance of toughness and hardness after case hardening, AISI 4317 is widely used in:
- Gears, shafts, and transmission parts
- Heavy-duty automotive components
- Machine tool parts
- Hydraulic and pressure system components
Product Forms Available at SAKYSTEEL
- Hot Rolled Alloy Steel Round Bar
- Forged 4317 Steel Block
- Rough Machined or Peeled Bars
- Heat Treatment: Annealed / Quenched & Tempered / Carburized
Why Choose SAKYSTEEL for AISI 4317?
- ISO-certified production and testing process
- Material test reports (EN10204 3.1 / 3.2) available
- Custom size cutting and CNC machining service
- Export-grade packaging for global delivery
Contact Us
If you are looking for a reliable
AISI 4317 steel bar supplier, contact
SAKYSTEEL for stock availability, mill certificates, and technical support.