S17700 17-7 PH (AISI 631) Stainless Steel Round Bar Overview

The S17700 17-7 PH (AISI 631) stainless steel round bar is a chromium-nickel-aluminum precipitation hardening stainless steel known for its exceptional strength, hardness, and moderate corrosion resistance up to 600°F (316°C). This grade is highly versatile, offering excellent formability in the austenitic condition (similar to Type 301 stainless steel) and the ability to achieve high strength levels through low-temperature heat treatments that minimize distortion. Its corrosion resistance is comparable to Type 304 stainless steel, particularly in the CH 900 temper, making it suitable for a wide range of applications, including springs, washers, eyelets, fittings, and fasteners.

Heat Treatment Process

The heat treatment process for S17700 17-7 PH stainless steel typically involves the following steps:

1. Conditioning: Austenite conditioning.

2. Cooling: Transformation of austenite into martensite.

3. Precipitation Hardening: Achieves Condition TH 1050 or RH 950.

4. Optional Cold Reduction: For Condition A material, cold reduction at the mill converts it to Condition C. After fabrication, a single low-temperature heat treatment achieves Condition CH 900.

Properties of 17-7 PH Stainless Steel Round Bar

• High Strength and Hardness: Achievable through precipitation hardening.

• Good Corrosion Resistance: Comparable to Type 304 stainless steel.

• Excellent Fatigue Resistance: Ideal for high-stress applications.

• Minimal Heat Treatment Distortion: Ensures dimensional stability.

• Good Machinability and Weldability: Facilitates easy fabrication.

Applications of 17-7 PH Stainless Steel Round Bars

The S17700 17-7 PH (UNS S17700, Grade 631) stainless steel round bar is widely used in demanding industrial applications, including:

• Aircraft Shells

• Structural Parts

• Missile Pressure Vessels

• Jet Engine Components

• Springs

• Diaphragms

• Bellows

• Antennas

• Fasteners

• Measuring Instruments

Specifications and Dimensions

Below are the typical specifications and dimensions for S17700 17-7 PH stainless steel round bars:

Chemical Composition (Weight %)

Mechanical Properties

Standard Dimensions

Key Features

• Precipitation Hardening: Allows for customizable strength and hardness levels.

• Corrosion Resistance: Suitable for environments requiring moderate corrosion resistance.

• Versatility: Ideal for aerospace, chemical processing, and industrial applications.

• Ease of Fabrication: Excellent machinability and weldability.

Conclusion

The S17700 17-7 PH (AISI 631) stainless steel round bar is a premium material for high-performance applications. Its unique combination of strength, hardness, and corrosion resistance makes it a preferred choice for industries requiring reliable and durable components. Whether for aerospace, chemical processing, or industrial manufacturing, this stainless steel grade delivers exceptional performance and versatility.

For specific dimensions or custom requirements, please contact us for further assistance!