SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs

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SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs

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MOQ : 100 Kilograms

SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs Specification

Width
3.0 to 300 Millimeter (mm)

Chemical Composition
Refer to the image

Temper
BA (Bright Annealed), 2B (Skin Passed), As Rolled (1/2H, 3/4H, H, EH)

Grade
SUS631 (17-7PH)

Thickness
0.030 to 3.0 Millimeter (mm)

Surface
Bright, Dull

Application
Other

Shape
Coil, Sheet

SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs Trade Information

Minimum Order Quantity
100 Kilograms

Payment Terms
Telegraphic Transfer (T/T)

Packaging Details
Our Standard Packing for Export

Main Export Market(s)
Asia, North America, South America, Eastern Europe, Western Europe, Middle East

About SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs

Grade	SUS631 (17-7PH)
Reference Standards (for reference only)	JIS SUS631 (G4305, G4313) UNS S17700 AISI 631 EN / ISO 1.4568 / 4568-177-00-I, X7CrNiAl17-7 GB S51770, 07Cr17Ni7Al
Shape	Coil, Sheet
Thickness	0.030-3.0(Strip, Sheet) Millimeter (mm)
Width	3.0-300(Strip, Sheet) Millimeter (mm)
Length	Strip or Sheet(Length less than 2,000mm)
Technique	Cold Rolled
Temper	BA(Bright Annealed), 2B(Skin passed), As Rolled(1/2H, 3/4H, H, EH)
Surface	Bright, Dull
Application	Diaphragms, Reed Valves, CPU/GPU Springs, Tire Mold Side Blades, Chains, Dental Equipment, Springs
Coil I.D.	300, 400, 511mm
Chemical Composition	Refer to the image
Mechanical Properties	Refer to the image
Density	7.81 g/cm
Specific Heat	420 J/(kgK)
Electrical Resistivity	79 cm
Young's Modulus	200 GPa
Thermal Expansion	15.310^-6/K0100
Thermal Conductivity	16.3 W/(mK)
Melting Range	1414-1447
Magnetism	It is weakly magnetic in the solution heat-treated state, but becomes quite strong after precipitation hardening treatment.
Minimum Order Quantity	100 Kilograms
Country of Origin	Japan, China, Taiwan
Payment Terms	Telegraphic Transfer (T/T)
Delivery Terms	EXW, FOB, CIF, DAP etc.
Packaging Details	Our Standard Packing for Export
Main Export Market(s)	Asia, Muddle East, North America, South America, Europe etc.

SUS631 is the most typical precipitation hardening type steel that can be heat treated to increase hardness while retaining the excellent performance of 18-8 stainless steel.

From the softest solution-treated to the hardest full hard rolled, depending on the processing and application, it is possible to have a strength second only to high-carbon martensitic quenched materials by applying various heat treatments.

In the solution heat-treated state, more than 30% elongation allows for strong processing such as drawing.

Please note that the material is weakly magnetic in the solution heat-treated state, but becomes quite strongly magnetic after precipitation hardening treatment.

This material is hard to obtain due to its relatively small distribution volume, and most of the materials distributed in stock sales are 3/4H finish. However, we can provide from the softest material in solution heat-treated condition (A material) to the hardest material with full hard finish (EH) per your use and processing method in small lot.

TOKKIN supplies a variety of stainless steels for springs as specified in JIS G4313

SUS631 (17-7PH) - UNS S17700 Description :

SUS631 (17-7PH) is one of the most widely used precipitation-hardening stainless steels, offering the ability to significantly increase strength and hardness through heat treatment while maintaining the excellent corrosion resistance characteristics of 18-8 stainless steel.

Available from soft solution-treated conditions to full-hard rolled tempers, SUS631 can achieve strength levels second only to high-carbon martensitic hardened steels when appropriate precipitation-hardening treatments are applied.

In the solution heat-treated condition, the material provides more than 30% elongation, allowing deep drawing and complex forming operations. After precipitation hardening, strength, hardness, and spring performance are dramatically improved.

Main Features:

Exceptional Strength After Heat Treatment

Precipitation hardening enables very high strength while maintaining good corrosion resistance.
Wide Range of Available Tempers

Available from soft solution-treated condition (A material) through work-hardened tempers up to EH (Extra Hard).
Excellent Formability Before Aging

High elongation in the solution-treated state allows deep drawing, bending, and complex forming operations.
Superior Spring Characteristics

High yield strength, fatigue resistance, and elastic recovery make it ideal for precision spring applications.
Corrosion Resistance of 18-8 Stainless Steel

Combines mechanical performance with reliable corrosion resistance for demanding industrial environments.
Magnetic Properties Change After Aging

Weakly magnetic in the solution-treated state and significantly more magnetic after precipitation hardening treatment.

SUS631 is commonly used for diaphragms, reed valves, high-performance springs, dental equipment, tire mold components, chains, and precision mechanical parts requiring a combination of high strength, fatigue resistance, and corrosion resistance.

While SUS631 is often difficult to source in a wide range of tempers due to limited market availability, TOKKIN can supply small-lot quantities from the softest solution-treated condition through full-hard EH material, depending on customer processing and performance requirements.

TOKKIN supplies a variety of spring stainless steel materials in accordance with JIS G4313 and related international standards.

Versatile Stainless Steel for Spring Applications

SUS631 (17-7PH) stainless steel is engineered for high performance in spring applications. Its exceptional formability and strength, combined with superior corrosion resistance, make it well-suited for components requiring durability and stability. The wide range of tempers and surface finishes enables customization for diverse industrial needs.

Precision Manufacturing for Optimal Performance

Produced in Japan to stringent quality standards, SUS631 (17-7PH) is available as coils and sheets in various dimensions. The steel undergoes precise processing-such as bright annealing and cold rolling-to achieve specific mechanical properties and surface finishes that optimize its use in springs and resilient components.

FAQ's of SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs:

Q: How is SUS631 (17-7PH) stainless steel processed for spring applications?

A: SUS631 (17-7PH) is processed through methods such as bright annealing (BA), skin passing (2B), or cold rolling to various hardness levels (1/2H, 3/4H, H, EH), allowing for control over its mechanical properties and surface finish, which are essential for spring performance.

Q: What are the main benefits of using SUS631 (17-7PH) for springs?

A: This grade offers a strong combination of high tensile strength, good ductility, excellent corrosion resistance, and stability under load, making it exceptionally suitable for springs operating in demanding environments.

Q: When should I choose SUS631 (17-7PH) over other stainless steels for my application?

A: SUS631 (17-7PH) should be selected when you require a material with superior strength, flexibility, and stress corrosion resistance-especially in critical spring applications where long-term reliability is crucial.

Q: Where is SUS631 (17-7PH) typically manufactured and supplied from?

A: This material is primarily manufactured, supplied, and exported from Japan, ensuring high quality standards and consistent properties for technical and industrial applications.

Q: What surface finishes are available for SUS631 (17-7PH) coils and sheets?

A: The available surface finishes include bright and dull, achieved through processing such as bright annealing and skin passing. These finishes can influence the appearance and functional properties of the springs.

Q: How do the different tempers of SUS631 (17-7PH) affect its use in springs?

A: Tempers like 1/2H, 3/4H, H, and EH refer to increasing levels of hardness and strength. The choice of temper depends on the spring's required resilience, load capacity, and fatigue resistance in its final application.

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