Grade 304H Stainless Steel (UNS S30409)

Unlike 304L, Type 304H has a higher carbon content making the steel more suitable for use in applications where elevated temperatures are present. It is an austenitic chromium-nickel steel alloy and the greater carbon content delivers an increased tensile and yield strength.

The material is recommended for use in ASME pressure vessels in working service above 525° C due to the grade's heat resistant properties.

Benefits of using 304H Stainless Steel

Benefits of using Grade 304H stainless steel include:

  • Higher carbon content gives the material greater heat resistant qualities
  • Higher tensile yield strength
  • Greater short and long term creep strength

Applications of 304H Stainless Steel

304H stainless steel is commonly found in the oil refining, gas and chemical industry and is used in industrial boilers, pressure vessels, heat exchangers, pipelines and condensers. The material is also used throughout the power generation industry.

Chemical Composition of Grade 304H Stainless Steel

The chemical composition of Grade 304H Stainless Steel is provided in the table below.

UNS NO Grade C Si Mn P S Cr Mo Ni N
S30409 304H 0.04/0.10 0.75 2.00 0.045 0.030 18.00/20.00 - 8.00/10.50 0.10

Mechanical Properties of Grade 304H Stainless Steel

The mechanical properties of Grade 304H Stainless Steel are provided in the table below.

UNS No Grade Proof Stress
0.2% (MPa)
Tensile Strength
(MPa)
Elongation
A5(%)
Hardness Max
HB HRB
S30409 304H 205 515 40 201 92

This information has been sourced, reviewed and adapted from materials provided by Masteel UK Ltd.

For more information on this source, please visit Masteel UK Ltd.

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Comments

  1. Shaik Shamsheer Shaik Shamsheer Romania says:

    IS THERE ANY ALTERNATE MATERIAL FOR 304H as same properties  such as  for corresive resistance and high temperature resistance

    • Paul Murphy Paul Murphy United Kingdom says:

      Hi Shaik,

      The nearest possible equivalent would be EN 10088-2 X5CrNi18-10.

      Hope this helps.

  2. Islam Soliman Islam Soliman Egypt says:

    Can I weld 304h by 308 or 308l?

  3. prasanna ramaswamy prasanna ramaswamy India says:

    what is the poisson's ratio of 304h ?

    • cheng chun-der cheng chun-der Taiwan says:

      Carbon content of SUS304H  is 0.04~0.1%. If its carbon content is 0.06%,  how can  you assure that the stainless steel is 304H but not 304? Because the carbon content of SUS304 is 0.03~0.08%.

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