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

Name: SUS631 (17-7PH) - UNS S17700 | PH Stainless Steel for Springs
Brand: TOKUSHU KINZOKU EXCEL CO., LTD.

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MOQ : 100 Kilograms

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

Property	Value
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
Available Shapes	Coil, Sheet
Manufacturable Thickness Range (Strip, Sheet)	0.030–3.0 mm
Manufacturable Width Range (Strip, Sheet)	3.0–300 mm
Length	Strip or Sheet (Length less than 2,000 mm)
Technique	Cold Rolled
Temper	BA (Bright Annealed), 2B (Skin Passed), As Rolled (1/2H, 3/4H, H, EH)
Surface Finish	Bright, Dull
Examples of Applications	Diaphragms, Reed Valves, CPU/GPU Springs, Tire Mold Side Blades, Chains, Dental Equipment, Springs
Coil I.D.	300, 400, 511 mm
Chemical Composition	Refer to the image
Mechanical Properties	Refer to the image
Density	7.81 g/cm³
Specific Heat	420 J/(kg·K)
Electrical Resistivity	79 μΩ·cm
Young's Modulus	200 GPa
Thermal Expansion	15.3 × 10^-6/K (0–100°C)
Thermal Conductivity	16.3 W/(m·K)
Melting Range	1414–1447 °C
Magnetism	Weakly magnetic in the solution heat-treated state; becomes strongly magnetic 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.
Packing	Our Standard Packing for Export
Export Markets	Asia, Middle East, North America, South America, Europe, etc.
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.