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The JIS standard heat treatment symbol for SUS631-CSP includes four types: O material for solution heat treatment finish, and 1/2H, 3/4H, and H for cold-rolled finish. However, due to the lack of availability of O material, our company uses SUS631-CP material instead. The chemical composition and mechanical properties of SUS631-CP and SUS631-CSPO materials are the same, but there are differences in plate thickness tolerance and manufacturing processes. The characteristic of SUS631, similar to wire, is that its tensile strength and hardness increase due to precipitation hardening heat treatment (because the added aluminum precipitates), but the conditions differ from those of wire (air-cooled after heating at 470±10°C for 1 hour). For more details, please refer to the related links. 【SUS631-CSP Heat Treatment Conditions】 ■Heat Treatment Name: CH ・Air-cooled after heating at 470±10°C for 1 hour *For more details, please refer to the PDF document or feel free to contact us.

Spring steel and carbon tool steel with carbon content of 0.4% or more increase in hardness by 2 to 3 times through heat treatment (quenching). By processing in a soft state before heat treatment and then increasing the hardness afterwards, complex shapes can be formed. They are characterized by low heat resistance and strong magnetism. As a note, they are prone to rust, so surface treatment measures are necessary. 【Overview】 ■ Carbon tool steel, etc., increases in hardness by 2 to 3 times through heat treatment (quenching) ■ Complex shapes can be processed by increasing hardness afterwards ■ Characterized by low heat resistance and strong magnetism *For more details, please refer to the related links or feel free to contact us.

We will introduce a comparison between SUS304CP and SUS304CSP. There are various types of SUS304 steel plates and strips, but in our company, we use SUS304-CP for parts that do not require much springiness (some refer to it as SUS304-2B based on the surface finish). For parts that require springiness, we use SUS304-CSP, and we differentiate between tempering grades 1/2H, 3/4H, and H according to the required workability and durability of the spring. SUS304 has differences in thickness tolerances and tensile strength according to standards, so you can view the details in the related links. [Tempering Overview] ■ Order of workability: 1/2H, 3/4H, H ■ Order of spring durability: H, 3/4H, 1/2H *For more details, please refer to the related links or feel free to contact us.