17-4 PH
17-4 PH
17-4 PH Stainless Steel is a martensitic precipitation-hardening alloy that combines high strength, excellent toughness, and moderate corrosion resistance. It offers one of the best strength-to-corrosion-resistance ratios among stainless steels, making it ideal for applications requiring durability under both mechanical stress and corrosive environments. The alloy retains its mechanical properties up to 600°F (316°C), ensuring reliable performance in demanding service conditions.
Apar Alloys supplies and stocks 17-4 PH Stainless Steel Round Bars in multiple heat treatment conditions to meet specific performance needs. With a strong global sourcing network and quality-focused operations, we ensure consistent material standards, dimensional precision, and timely availability. Each round bar is tested and certified to international specifications, ensuring suitability for critical industrial applications.
Specifications
| Grade | AISI | UNS | ASTM A276 / A479 | ASTM A182 | EN (W-Nr) | DIN Spec |
|---|---|---|---|---|---|---|
| 17-4 PH | AISI 630 | S17400 | ASTM A564 | F630 | 1.4542 | X5CrNiCuNb16-4 |
General Characteristics
Martensitic precipitation-hardening stainless steel
Excellent strength and hardness with good corrosion resistance
Heat treatable to multiple conditions without distortion
Retains mechanical properties up to 600°F (316°C)
Good machinability in solution-treated condition
Consistent dimensional stability during heat treatment
Chemical Composition (nominal) %
| Element | C | Si | Mn | P | S | Cr | Ni | Cu | Nb + Ta | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| 17-4 PH | ≤0.07 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | 15.0–17.5 | 3.0–5.0 | 3.0–5.0 | 0.15–0.45 | Balance |
Heat Treatment Conditions
Heat Treatment is a crucial process that defines the final strength, hardness, and corrosion resistance of 17-4 PH stainless steel. This precipitation-hardening alloy achieves its unique combination of properties through carefully controlled heating and cooling cycles that alter the microstructure of the material. At Apar Alloys, we treat heat treatment as a science guided by experience — every batch is processed under strict temperature control, monitored through advanced furnace systems, and validated by metallurgical testing.
Our heat treatment operations are carried out in state-of-the-art furnaces equipped with precise temperature and atmosphere control, ensuring uniformity across every part. Each cycle is supported by data logging, hardness testing, and microstructure examination, confirming that the material meets exact mechanical and dimensional specifications.
We provide 17-4 PH in various heat treatment conditions to suit customer requirements and performance criteria:
- H900: Delivers maximum strength and hardness, ideal for high-load components and springs.
- H925: Offers slightly lower hardness but improved ductility and toughness.
- H1025: Balances tensile strength and impact resistance for mechanical assemblies.
- H1075: Increases resistance to stress corrosion and enhances stability at elevated temperatures.
- H1100: Provides high toughness and good stress relaxation resistance.
- H1150: Ensures excellent ductility and dimensional stability for structural parts.
- H1150D: Double-aged condition offering exceptional toughness and superior resistance to thermal fatigue.
Every treated batch undergoes mechanical testing (tensile, yield, hardness) and microstructure verification to confirm complete precipitation hardening and uniform grain structure. This guarantees that each 17-7 PH product from Apar Alloys consistently performs to the highest industrial and international standards.
Applications
Aerospace components and turbine parts
Pump shafts and valve bodies
Marine fittings and fasteners
Pulp and paper machinery
Chemical process equipment
Nuclear and energy sector hardware
Advantages
- Exceptional strength-to-weight ratio
- Corrosion resistance similar to 304 stainless steel
- Excellent performance after single-step heat treatment
- Good resistance to stress corrosion cracking
- Stable mechanical properties across temperature ranges
- Low maintenance with long service life
Mechanical Properties (Typical at Room Temperature)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 1030 – 1310 |
| Yield Strength (MPa) | 860 – 1170 |
| Elongation (%) | 10 – 17 |
| Hardness (Brinell) | 285 – 415 HB |
Why Choose Apar Alloys
Wide Range of Heat Treatment Conditions
We maintain ready stock of 17-4 PH Stainless Steel Round Bars in all major heat treatment conditions — H900, H925, H1025, H1075, H1100, H1150, and H1150D — ensuring availability for varied industrial applications.
Trusted Global Sourcing
All materials are sourced from reputed international mills, guaranteeing consistent quality, reliable composition, and traceable certifications as per global standards.
Strict Quality Control
Every bar undergoes dimensional checks, mechanical testing, and visual inspection to ensure compliance with ASTM, EN, and DIN specifications.
Customization and Precision Cutting
We offer tailored cutting, sizing, and surface finish options to match client-specific requirements, supporting precision manufacturing and fabrication processes.
Technical Expertise and Support
Our experienced team provides material selection guidance and technical assistance, ensuring that each client receives the most suitable grade and condition for their application.
Reliable Delivery and Competitive Pricing
With a strong logistics network and optimized inventory, we ensure timely deliveries while maintaining cost-effective solutions without compromising on quality.
Get in Touch
Contact Us
Looking for 17-4 PH Stainless Steel Round Bars in specific conditions or sizes? Apar Alloys offers reliable material solutions with assured quality, precision, and timely delivery. Contact us today for quotes or technical assistance.
[Call] +91 98333 89128
301, 3rd floor, A WING, Krishvi Escape, Near Vinay Health Home, Fanaswadi Bhuleshwar, Mumbai - 400002.
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