JIS G4303 SUS631, also known as 17-7PH stainless steel, is a precipitation-hardening stainless steel alloy characterized by its excellent combination of high strength, corrosion resistance, and formability. It offers superior mechanical properties and is widely used in various applications requiring robust performance and versatility.

Physical Properties:

JIS G4303 SUS631 / 17-7PH stainless steel round bar exhibits a density of approximately 7.8 g/cm³, providing exceptional strength while maintaining a relatively lightweight profile. It has a melting point of around 1370-1420°C and a thermal conductivity of approximately 17.8 W/m·K.

Size Range:

Available in a comprehensive range of sizes, JIS G4303 SUS631 / 17-7PH stainless steel round bar typically spans from 5 mm to 300 mm in diameter, catering to diverse application requirements.

Chemical Composition:

The typical chemical composition of JIS G4303 SUS631 / 17-7PH stainless steel round bar includes:

- Chromium (Cr): 16.0-18.0%

- Nickel (Ni): 6.5-7.75%

- Aluminum (Al): 0.75-1.50%

- Carbon (C): ≤0.09%

- Manganese (Mn): ≤1.00%

- Silicon (Si): ≤1.00%

- Phosphorus (P): ≤0.040%

- Sulfur (S): ≤0.030%

- Iron (Fe): Balance

Mechanical Properties:

- Tensile Strength: ≥965 MPa

- Yield Strength: ≥860 MPa

- Elongation: ≥6%

These robust mechanical properties ensure excellent performance in demanding applications.

Hardness:

JIS G4303 SUS631 / 17-7PH stainless steel round bar typically exhibits a Rockwell hardness of approximately C40.

Standard Compliance (ASTM A240, JIS G4304):

JIS G4303 SUS631 / 17-7PH stainless steel round bar complies with international standards such as ASTM A240 and JIS G4304, ensuring quality and consistency in production.

Non-Destructive Testing Standard:

Standard non-destructive testing methods, including ultrasonic inspection, are employed to ensure the quality and integrity of JIS G4303 SUS631 / 17-7PH stainless steel round bars.

Corrosion Resistance:

JIS G4303 SUS631 / 17-7PH stainless steel offers excellent corrosion resistance, particularly in harsh environments containing corrosive chemicals and high humidity. It demonstrates high resistance to both general and localized corrosion.

Heat Treatment Condition:

JIS G4303 SUS631 / 17-7PH stainless steel round bar undergoes precipitation hardening treatment to achieve its high strength and hardness characteristics.

Main Applications:

- Aerospace: Used in aircraft structural components, springs, and fasteners.

- Automotive Industry: Employed in automotive suspension components and engine parts.

- Medical Devices: Utilized in medical instruments, surgical tools, and implants.

- Precision Engineering: Found in precision shafts, gears, and valve components.

- Marine Engineering: Used in marine hardware, shafts, and propeller shafts.

TJC Steel Supply Case:

TJC Steel (TJC Iron & Steel(Group) Co., Limited) is a leading supplier of JIS G4303 SUS631 / 17-7PH stainless steel round bars, adhering strictly to international standards like ASTM A240 and JIS G4304. They provide reliable solutions for various industries, ensuring the highest quality standards are met.