Stainless Steel
Stainless Steel
Daido Steel Stainless Steel

Daido Steel is developing and producing stainless steel with properties such as free-cutting, cold workability, high-strength to meet the various needs of customers.

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Precipitation Hardening Stainless Steel

Precipitation Hardening Stainless Steel of Improved Cold Workabilty : SUS630-S,DSP1H

Features and Applications

Features Cold workability and machinability is greatly improved under solution heat treatment condition.
Applications Bolt, shaft, high strength pin

Chemical Composition

DAIDO BRAND Chemical Composition(mass%) JIS
C Ni Cr Cu Free-cutting
SUS630-S ULC 4.5 16.0 3.0 Added SUS630
DSP1H 0.02 6.5 13.0 - - -



  • Chemical composition is within JIS standard of SUS630 and modified to improve cold workability and machinability under solution heat treatment condition.
  • Compression property is 15~20% lower than SUS630 regarding stress-strain.
  • Hardness and corrosion resistance after precipitation hardening treatment is equivalent to SUS630.


  • High hardness is achieved by short precipitation hardening treatment.
  • Corrosion resistance is better than SUS420J2, lesser than SUS630.
  • Cold work hardening property is less and it is available for cold header.

Technical Data

Technical Data_SUS630-S、DSP1H

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