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UNS s30400/s30403

Chemical Composition %

C Cr Mn NI P S Si
Max Max Max Max Max
0.035 18.0-20.0 2.0 8.0-13.0 0.040 0.030 0.75



  • ASTM
  • A312, A376, A358, A269, A249, A403, A182, A351
  • ASME
  • SA312, 5A376, SA358, SA269, SA249, SA403, SA182, SA351


304 stainless steel is a low carbon (0.08% max) version of basic 18-8 also known as 302. Type 302 has 18% chromium and 8% nickel. Type 304 has slightly lower strength than 302 due to its lower carbon content. Type 304 stainless steel finds extensive use in welding applications because the low carbon permits some exposure in the carbide precipitation range of 800 0 F – 1500 OF without the need for post-annealing operations. However, the severity of corrosive environments may necessitate annealing after welding or the use of 304L. Type 304L has a carbon content of 0.03% or less. This alloy can be used in the as-welded condition without becoming susceptible to intergranular corrosion.

Design Features

  • Oxidation resistance up to 1650 0 F for continuous service and up to 1 1500 deg.F where cyclic heating is involved.
  • General purpose corrosion resistance.
  • Non-hardenable except by cold working.
  • Non-magnetic except when cold worked.
  • May be susceptible to chloride stress corrosion cracking.
  • Used where field working is employed.

Typical Applications

  • Sanitary
  • Dairy and Food processing
  • Heat exchangers, evaporators
  • Feedwater heaters

Tensile Requirements

  • Tensile Strength (KSI) 70
  • Yield Strength (KSI) 25
  • KSI can be converted to MPA (Megapascals) by multiplying by 6.895.
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