High-Strength 17-4PH Precipitation-Hardened Stainless Steel Bar (Grade 630)​​

​​Introduction:​​
17-4PH stainless steel offers excellent corrosion resistance, good mechanical properties, and heat treatability. It features exceptional resistance to chloride stress corrosion cracking, especially in chloride environments. Its composition—iron, chromium, nickel, copper, and molybdenum, with minor carbon and niobium—ensures reliable mechanical properties and stability in high-temperature and highly corrosive environments.

​​Key Characteristics:​​

1. ​​High Strength:​​ Achieves tensile strengths ~1100 MPa via heat treatment (e.g., under H1150: solution treatment + low-temperature aging).
2. ​​Corrosion Resistance:​​ Superior to many stainless steels, particularly in specific chemical and climatic environments.
3. ​​Heat Treatability:​​ Properties are adjustable through solution treatment and aging for enhanced strength or corrosion resistance.
4. ​​Grindability:​​ Maintains good surface finish post-heat treatment for precision applications.
5. ​​Weldability:​​ Good with controlled heat treatment and proper welding methods.

​​Applications:​​
Widely used in demanding aerospace, petrochemical, and medical device applications due to its optimal balance of strength, hardness, corrosion resistance, and heat treatability.

17-4PH: Primary Application Fields​​

1. ​​Aerospace:​​ Aircraft components, engine parts, and aerospace structural elements (leveraging high strength-to-weight ratio).
2. ​​Oil & Gas:​​ Valves, pump components, and downhole equipment for harsh extraction environments (utilizing superior corrosion resistance).
3. ​​Medical Devices:​​ Surgical instruments, orthopedic implants, and forceps (requiring biocompatibility and corrosion resistance).
4. ​​Marine Engineering:​​ Seawater-resistant components for offshore platforms, vessels, and diving gear (demanding high strength and corrosion resistance).
5. ​​Automotive:​​ Engine, transmission, and suspension components (enhancing strength and wear resistance).
6. ​​Military:​​ Critical weapon system components, including fire control systems and missile parts (requiring high strength and reliability).