Its key composition includes:
- Chromium (Cr): 15.0–17.5%
- Nickel (Ni): 3.0–5.0%
- Copper (Cu): 3.0–5.0%
- Niobium (Nb): 0.15–0.45%
- Carbon (C): ≤0.07%
- Other Elements: Manganese (Mn) ≤1.0%, Silicon (Si) ≤1.0%, Phosphorus (P) ≤0.04%, Sulfur (S) ≤0.03%23.
Physical & Mechanical Properties:
- Density: 7.75 g/cm³
- Tensile Strength: Up to 1,310 MPa (H900 condition)
- Yield Strength: Up to 1,172 MPa (H900 condition)
- Elongation: ≥10% (H900 condition)
- Hardness: HRC 40–45 (H900 condition)34.
Product Performance Highlights
High Strength & Durability:
- Achieves superior tensile and yield strength through precipitation hardening, making it ideal for high-stress applications such as aerospace components and industrial machinery14.
- Maintains toughness even at elevated temperatures (up to 316°C)4.
Excellent Corrosion Resistance:
- Resists atmospheric corrosion, mild acids, and chloride environments, outperforming 400-series martensitic stainless steels45.
- Comparable corrosion resistance to Type 304 stainless steel in many environments4.
Versatile Fabrication:
- Easily machined, welded, and cold-worked using standard methods. Post-weld heat treatment ensures uniform mechanical properties35.
Magnetic Properties:
- Exhibits magnetic behavior in hardened conditions, suitable for specialized industrial applications6.
Production Methods
17-4PH round bars are manufactured through a precise process:
- Melting & Casting:
- Raw materials are melted in electric arc furnaces (EAF) and refined to achieve precise chemical composition34.
- Hot Rolling:
- Cast ingots are heated to 1,150–1,200°C and hot-rolled into round bars to refine grain structure36.
- Heat Treatment:
- Solution Annealing: Heated to 1,038°C, held for 1 hour, then rapidly cooled to form a uniform microstructure36.
- Aging (Precipitation Hardening): Heated to 480–620°C for 4–8 hours to precipitate strengthening phases (e.g., copper-niobium compounds)36.
- Finishing:
- Bars are ground, polished, or coated to meet dimensional and surface-quality standards6.
Equivalent Grades & Standards
- UNS S17400
- ASTM A564, ASTM A693, AMS 5604
- DIN 1.4542, EN X5CrNiCuNb16-4
- JIS SUS630, GB 0Cr17Ni4Cu4Nb23.
Key Application Fields
17-4PH round bars are widely used in industries demanding high strength and reliability:
- Aerospace:
- Aircraft structural components, landing gear parts, and fasteners14.
- Medical Devices:
- Surgical instruments, orthopedic implants, and dental tools due to biocompatibility and strength13.
- Oil & Gas:
- Valve components, pump shafts, and downhole tools exposed to corrosive media45.
- Industrial Machinery:
- Gears, bearings, and high-stress mechanical parts requiring wear resistance6.
- Nuclear & Energy:
- Reactor components and turbine parts for high-temperature stability34.
- 17-4PH Round Bar Supplier
- UNS S17400 High-Strength Stainless Steel
- Precipitation-Hardening 17-4PH Rod
- ASTM A564 17-4PH Round Bar
- Aerospace-Grade 17-4PH Applications
- Medical-Grade 17-4PH Machining
- Corrosion-Resistant 17-4PH Alloy
17-4PH round bars deliver unmatched strength and corrosion resistance for critical applications. For custom specifications or bulk orders, partner with a certified supplier specializing in high-performance stainless steel alloys.
