Classification

Martensitic Stainless Steel

Typical grade is SUS403, which is one of 13Cr series.

  • As a property of martensitic stainless steel, it is hardened by rapid cooling or air cooling from high temperature. Wide range of hardness, strength, flatting and toughness are achieved by tempering at appropriate temperature.
  • When it is heated in air, oxidation resistance is good. Strength is kept up to 500℃ and it can be applied for heat resistant condition.
  • It is eroded by reducing solution such as Sulfuric acid and hydrochloric acid.

    Corrosion resistance becomes lower if content of carbon, sulfur and phosphorus is higher.
  • At welding, hardening crack has to be cared due to transformation distortion and hardenability.
  • It has strong magnetic property under the condition of annealing, quenching and tempering.
Classification DAIDO BRAND
Free-cutting Stainless Steel
Stainless Steel for Cold Deformation
High Strength Stainless Steel

Ferritic Stainless Steel

Typical grades are SUS430 of 17Cr series.

  • Quenching at high temperature does not result in hardening.
  • Features of ferritic stainless steel are as follows; it is scarcely hardened by quenching from high temperature. In oxidizing solution and the air, corrosion resistance of the ferritic stainless steel is superior to that of 13 Cr.
  • Grains are not able to be refined by heat treatment, attention should be paid not to be coarsened at high temperature.
  • It is easy for cold working because most of areas are soft ferritic structure in any status. It shows magnetic property.
Classification DAIDO BRAND
Free-cutting Stainless Steel
Stainless Steel for Cold Deformation

Austenitic Stainless Steel

Typical grade is SUS304, which is one of 18Cr-8Ni series.

  • As a property of austenitic stainless steel, it is not be hardened by rapid cooling from high temperature, but it is able to be hardened by cold working.
  • It has superior corrosion resistance so that it is applied to parts avoiding rust and chemical equipment.
  • It has good oxidation resistance. It is used as heat resistant steel due to its high strength in high temperature.
  • Grains are not able to be refined by heat treatment, attention should be paid not to be over heated.
  • Most of stainless steel is non-magnetic after solution heat treatment of rapid cooling from high temperature, but it is hardened and slightly become magnetic by cold working.
  • Superior corrosion resistance is achieved by solution heat treatment.
  • In the case of SUS304, intergranular corrosion tends to be occurred by heating over 600℃. SUS304L and SUS316L are suitable for such application. We recommend using SUS321 and SUS347.
Classification DAIDO BRAND
Stainless Steel for Cold Deformation
High Strength and Non-magnetic Stainless Steel
High Corrosion Resistance Stainless Steel

Precipitation Hardening Stainless Steel

Typical grades are SUS630 and SUS631.

  • Feature of precipitation hardening stainless steel is high hardness. It is achieved by age hardening after solution treatment.
  • Strength is the best of all stainless steel. Corrosion resistance is superior to martensitic and ferritic stainless steel, though it is inferior to austenitic.
Classification DAIDO BRAND
Stainless Steel for Cold Deformation

Duplex Stainless Steel

Typical grades are SUS329J1.

  • Features of duplex stainless steel are high strength and corrosion resistance by combination of austenitic and ferritic structures.
  • It has superior properties of stress resistance, corrosion cracking, pitting corrosion resistance, and grain-boundary corrosion resistance.

Classification DAIDO BRAND
High Strength and Corrosion Resistance Stainless Steel
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