Heat-Treated 17-4PH Stainless Steel Bar - CNC Machining Grade, ±0.05mm Tolerance
heat-treated 17-4PH stainless steel bars are precision-engineered for high-performance CNC machining applications requiring exceptional strength, corrosion resistance, and dimensional accuracy. These bars undergo solution annealing and aging (H1150 condition) to achieve a hardness of 38–42 HRC, optimizing them for aerospace, medical, and automotive industries. With a ultra-tight tolerance of ±0.05mm and a smooth turned surface, they minimize post-machining work and ensure seamless integration into critical components. The 17-4PH grade’s unique combination of martensitic structure and precipitation hardening delivers superior fatigue resistance, making it ideal for high-stress environments.
2. Technical Specifications
| Parameter | Details |
| Material | 17-4PH Stainless Steel (UNS S17400 / AMS 5643) |
| Element Composition | Cr: 15–17.5%, Ni: 3–5%, Cu: 3–5%, Nb: 0.15–0.45%, C: ≤0.07%, Fe: Balance |
| Heat Treatment | Solution annealed + H1150 aging |
| Hardness | 38–42 HRC |
| Diameter Tolerance | ±0.05mm |
| Surface Finish | Turned or ground (Ra ≤1.6μm) |
| Tensile Strength | ≥1310 MPa |
| Certifications | AMS 5643, ASTM A564, ISO 4954, Nadcap (optional) |
| Applications | Aircraft fittings, surgical tools, automotive valves, nuclear components |
3. Competitive Advantages
① Precision Machining Readiness
Pre-hardened bars with ±0.05mm tolerance reduce CNC cycle times and tool wear, ensuring cost-effective production of complex parts.
② Optimized Heat Treatment
Controlled aging process enhances mechanical properties while maintaining corrosion resistance in humid or chemical environments.
③ Aerospace-Grade Compliance
AMS 5643 and Nadcap certifications guarantee material traceability and consistency for critical aerospace and defense projects.
④ High Strength-to-Weight Ratio
17-4PH’s tensile strength (1310+ MPa) outperforms standard 304/316 grades, ideal for lightweight yet durable components.
⑤ Corrosion & Wear Resistance
Chromium and copper additions provide resistance to oxidation, salt spray, and abrasive wear in harsh operational conditions.
⑥ Custom Solutions
Available in diameters from 5mm to 100mm, with optional grinding, polishing, or cut-to-length services.
4. Key Applications
- Aerospace: Landing gear components, turbine blades, and actuator shafts requiring high fatigue strength.
- Medical Devices: MRI machine parts, surgical instrument shafts, and orthopedic implants needing biocompatibility.
- Automotive: Fuel injectors, turbocharger shafts, and high-pressure valve systems.
- Energy Sector: Pump shafts, nuclear reactor fittings, and offshore drilling components.
- Defense: Firearm components, missile guidance systems, and armored vehicle parts.
- Industrial Machinery: Hydraulic rods, robotic arms, and dies for high-wear applications.
Why Partner with JIANGSU CHINA STEEL UNION INDUSTRIAL CO., LTD?
We specialize in advanced stainless steel solutions for mission-critical industries. Our 17-4PH bars are rigorously tested to meet global standards, ensuring reliability in the most demanding environments. Trust our expertise to deliver precision, durability, and unmatched technical support for your CNC machining projects.
FAQ
Q: Why choose us?
A: Our company have been in steel business for more than ten years, we are internationally experienced, professional, and we can provide variety of steel products with high quality to our clients.
Q: Can provide OEM/ODM service?
A: Yes. Please feel free to contact us for more details discuss.
Q: How is your Payment Term?
A:One is 30% deposit by TT before production and 70% balance against copy of B/L; the other is Irrevocable L/C 100% at sight.
Q: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.
Q: Can you provide sample?
A: Yes, for regular sizes sample is free but buyer need to pay freight cost.
Q: How long is your delivery time?
A: Our daily inventory is more than 8000 tons, so for common product size, just need 3 days from stocks; if the special size from new production, delivery 15-20 days.
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Heat Treated 17-4PH Stainless Steel Round Bar CNC Machining Grade Images
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