CNC Machining Grade 38CrMoAlA Alloy Steel Round Bar Alloy 31CrMoV9 / 1.8509 Steel Rod
CNC Machining Grade 38CrMoAlA Alloy Steel Round Bar Alloy 31CrMoV9 / 1.8509 Steel Rod
Products Specification
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Products Name |
38CrMoAlA Nitriding Steel Round Bar |
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Diameter |
10 - 300 mm |
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Length |
6m or custom cutting any length as request |
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Type |
Hot Rolled |
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Brand |
BAOSTEEL DELTA DONGBEI HUAXI SHAGANG.etc |
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MOQ |
1 Ton |
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Loading Port |
Shanghai Port |
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Packing |
packing by steel wire rope |
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Deliver time |
5 - 7 days for stock materials |
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Other Grade |
Q195,Q235,10#,20#,35#,45#,Q215,Q345,12Cr1Mov,15CrMo,304,3 16,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,5CrMnMo ,38CrMoAl, 31CrMoV9 |
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Standard |
ASTM GB EN DIN |
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Application |
Structure and Industrial |
38CrMoAlA is a high-performance nitriding steel widely used in precision engineering applications due to its exceptional surface hardness and core toughness. It is ideal for components requiring wear resistance, high fatigue strength, and dimensional stability after nitriding.
Key Advantages
✔ Superior Nitriding Performance – Forms a hard nitride layer (≥850 HV) with excellent wear resistance.
✔ High Strength & Toughness – Maintains good mechanical properties even after heat treatment.
✔ Machinability & Weldability – Can be machined in annealed condition; pre-/post-weld heat treatment recommended.
✔ Thermal Stability – Resists softening at elevated temperatures.
Technical Specifications
Chemical Composition (GB/T 3077)
| Element | C | Cr | Mo | Al | Mn | Si | P ≤ | S ≤ |
|---|---|---|---|---|---|---|---|---|
| % Range | 0.35–0.42 | 1.35–1.65 | 0.15–0.25 | 1.00–1.30 | 0.30–0.60 | 0.20–0.45 | 0.025 | 0.025 |
Mechanical Properties (After Heat Treatment)
| Property | Tensile Strength | Yield Strength | Elongation | Impact Toughness | Hardness (HB) |
|---|---|---|---|---|---|
| Value | ≥980 MPa | ≥835 MPa | ≥14% | ≥63 J | 269–302 |
Post-Nitriding Surface Properties
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Surface Hardness: 900–1100 HV
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Nitride Layer Depth: 0.3–0.6 mm (adjustable via nitriding process)
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Distortion Control: Low deformation due to controlled heat treatment.
Recommended Heat Treatment
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Annealing (Optional for Machining): 840–860°C, slow cooling.
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Quenching: 930–950°C (oil cooling).
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Tempering: 600–650°C (air cooling).
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Nitriding (Gas/Ion/Plasma): 500–540°C (time varies based on required case depth).
Global Equivalent Grades
| Country | Standard | Equivalent Grade |
|---|---|---|
| USA | AMS | AMS 6470 (Nitraloy 135M) |
| Germany | DIN | 31CrMoV9 (1.8509) |
| Japan | JIS | SACM645 |
| Europe | EN | 34CrAlNi7 (1.8550) |
Typical Applications
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Precision Gears & Transmission Parts
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Hydraulic/Pneumatic Cylinder Rods
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Plastic Injection Molding Screws & Barrels
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Aerospace & Automotive High-Stress Components
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Tooling & Fixtures Requiring Wear Resistance
Available Forms & Customization
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Round Bars: Ø10mm – Ø300mm (standard), custom diameters available.
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Surface Finish: Black, polished, or precision ground.
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Certification: EN 10204 3.1, ISO 683-3, or customer-specific requirements.
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Special Processing: Ultrasonic testing (UT), straightening, pre-cut lengths.
Why Choose Our 38CrMoAlA?
✅ Strict Quality Control – Fully traceable material batches.
✅ Competitive Lead Time – Stock availability for common sizes.
✅ Technical Support – Heat treatment & machining recommendations provided.
Contact us for a quote or additional technical data!
Differences from Previous Version:
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More structured, application-focused (emphasizes machining, welding, and nitriding performance).
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Expanded heat treatment details (includes annealing for machinability).
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Clearer global equivalents table (improves cross-standard reference).
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Stronger commercial appeal (highlights quality control and support).
Let me know if you'd like further adjustments (e.g., more ASTM-focused or additional testing details).
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.