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Products Description

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

The 17-7 PH stainless steel round bar is a chromium-nickel-aluminum precipitation hardening stainless steel known for its high strength, hardness, and moderate corrosion resistance up to 600°F (316°C). This material offers excellent machinability and weldability, making it easy to fabricate into various components. Its precipitation hardening capability allows for heat treatment to achieve different levels of strength and hardness, making it a versatile choice for demanding applications.

Key Features

High Strength and Hardness: Achievable through precipitation hardening.
Moderate Corrosion Resistance: Comparable to Type 304 stainless steel.
Excellent Formability: Can be easily formed in the austenitic condition.
Minimal Distortion During Heat Treatment: Ensures dimensional stability.
Fatigue Resistance: Ideal for high-stress applications.

Applications

The 17-7 PH stainless steel round bar is widely used in industries requiring high performance and reliability. Common applications include:

Springs
Washers
Eyelets
Fittings
Fasteners
Aerospace Components
Chemical Processing Equipment

Heat Treatment Process

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

Conditioning: Austenite conditioning.
Cooling: Transformation of austenite into martensite.
Precipitation Hardening: Achieves Condition TH 1050 or RH 950.
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.

Chemical Composition (Weight %)

Element	Cr	Ni	Al	C	Mn	Si	P	S	Fe
Percentage	16.0-18.0	6.5-7.75	0.75-1.50	≤0.09	≤1.00	≤1.00	≤0.04	≤0.03	Balance

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HRC)
Condition A	1035	380	20	≤38
Condition C	1450	1310	6	≤43
TH 1050	1450	1310	6	≤43
RH 950	1650	1450	4	≤48
CH 900	1650	1450	4	≤48

Specifications and Dimensions

Standard Dimensions

Diameter (mm)	Length (mm)	Tolerance (mm)	Surface Finish
10 - 50	1000 - 6000	±0.1	Bright / Polished
50 - 100	1000 - 6000	±0.2	Bright / Polished
100 - 200	1000 - 6000	±0.3	Bright / Polished
200 - 300	1000 - 6000	±0.5	Bright / Polished

Available Standards

Standard	Description
ASTM A564	Standard specification for hot-rolled and cold-finished age-hardening stainless steel bars.
AMS 5528	Aerospace Material Specification for stainless steel sheet and strip.
AMS 5678	Aerospace Material Specification for stainless steel wire.
UNS S17700	Unified Numbering System designation for 17-7 PH stainless steel.

Advantages of 17-7 PH Stainless Steel

High Strength and Hardness: Suitable for high-performance applications.
Corrosion Resistance: Performs well in moderate corrosive environments.
Ease of Fabrication: Excellent machinability and weldability.
Customizable Properties: Heat treatment allows for tailored strength and hardness levels.

Conclusion

The 17-7 PH (AISI 631) stainless steel round bar is a premium material designed for applications requiring high strength, hardness, and moderate corrosion resistance. Its unique properties make it ideal for industries such as aerospace, chemical processing, and manufacturing. Whether for springs, fasteners, or structural components, 17-7 PH stainless steel delivers exceptional performance and reliability.

For custom dimensions, heat treatment options, or additional specifications, contact us today to discuss your requirements!

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