Stainless Steels for Springs [TOKUSHU KINZOKU EXCEL CO., LTD.]
SUS301, SUS304, SUS631, SUS632J1, SUS420J2
Materials specified in JIS G 4313 are used for spring applications because they can achieve high strength through cold working and heat treatment.
Our company handles five types of steel: SUS301, SUS304, SUS631, SUS632J1, and SUS420J2, allowing you to select the appropriate type based on your application, purpose, and required characteristics. We also accept orders for stainless steel foil and specifications that are not commonly available (such as thickness and heat treatment) in small lots, enabling us to provide you with the optimal condition. For more details, please refer to the related links or feel free to contact us.
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basic information
The available dimensions, delivery times, and prices vary depending on the materials, so please feel free to contact us. <Materials> - SUS301 - SUS304 - SUS631 - SUS632J1 - SUS420J2 <Manufacturing range> Thickness: 0.010 to 2.5mm *depending on the steel type Width: 3 to 300mm
Price range
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Applications/Examples of results
Automotive parts such as seat belt springs and coils, tactile switches, membrane switches, clocks, stationery, etc.
Line up（4）
| Model number | overview |
|---|---|
| SUS301, SUS304 | These are versatile steel types with strong work hardening characteristics and corrosion resistance typical of austenitic stainless steel. |
| SUS631 (17-7PH) | This is a representative type of precipitation hardening stainless steel that can increase hardness through heat treatment, but it is relatively rare in circulation, making it difficult to obtain. |
| SUS632J1 (15-7PH) | SUS632J1 has high strength even in a solution-treated state due to its martensitic phase, allowing for a certain level of strength to be achieved without cold working that would impair directionality. |
| SUS420J2 | Due to its higher carbon (C) content, this material can be hardened through quenching and tempering heat treatment. In our annealed finish state, the carbides are completely spheroidized, making it easy to process and excellent in hardenability. |
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Company information
TOKKIN's materials are everywhere around you, even though you can't see them! TOKKIN is a precision metal materials manufacturer founded in 1940. We produce high-quality, high-value-added materials according to the each customer specifications, such as processing metals into thin strips or sheets by cold rolling to improve mechanical properties, cladding different materials to form a single material, and applying resin or solder to metal surfaces. Our materials are used in a wide range of products, from daily life gadgets such as smart devices, PCs, automobiles, and game consoles to industrial equipment such as semiconductor manufacturing equipment, medical equipment, and textile machinery. Although our material is mostly invisible, it plays an indispensable role in ensuring that the products and their supporting components function well. High-functional materials, made possible only by TOKKIN, support the technologies that are created one after another behind the scenes.