• Subscribe
    Fill something at the
    'Theme option > Overall Elements > Top Bar > Top Bar Subscribtion' section
  • Login
contact: sales@scimetals.com


Chemical Composition

The following table shows the chemical composition of grade 347H stainless steel.

Element Content (%)
Iron, Fe 62.83 – 73.64
Chromium, Cr 17 – 20
Nickel, Ni 9 – 13
Manganese, Mn 2
Silicon, Si 1
Niobium, Nb (Columbium, Cb) 0.320 – 1
Carbon, C 0.04 – 0.10
Phosphorous, P 0.040
Sulfur, S 0.030

Physical Properties

The physical properties of grade 347H stainless steel are given in the following table.

Properties Metric Imperial
Density 7.7 – 8.03 g/cm3 0.278 – 0.290 lb/in³

Mechanical Properties

The mechanical properties of grade 347H stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength, ultimate 480 MPa 69600 psi
Tensile strength, yield 205 MPa 29700 psi
Rupture strength (@750°C/1380°F, time 100,000 hours) 38 – 39 MPa, 5510 – 5660 psi
Elastic modulus 190 – 210 GPa 27557 – 30458 ksi
Poisson’s ratio 0.27 – 0.30 0.27 – 0.30
Elongation at break 29% 29%
Hardness, Brinell 187 187

Other Designations

Other designations that are equivalent to grade 347H stainless steel include the following:

  • ASTM A182
  • ASTM A213
  • ASTM A240
  • ASTM A249
  • ASTM A271
  • ASTM A312
  • ASTM A336
  • ASTM A376
  • ASTM A403
  • ASTM A430
  • ASTM A479
  • ASTM A813
  • ASTM A814
  • SAE 30347H

Fabrication and Heat Treatment


Machining grade 347H stainless steel is slightly tougher than that of grade 304 steel. However, the hardenability of this steel can be minimized by the use of constant positive feeds and slow speeds.


Grade 347H stainless steel can be welded using most of the resistance and fusion methods. Oxyacetylene welding is not preferred for this steel.

Hot Working

Forging, upsetting and other hot work processes can be performed at 1149 to 1232°C (2100 to 2250°F). The grade 347H steel has to be water quenched and annealed to obtain maximum hardness.

Cold Working

Grade 347H stainless steel can be readily stamped, blanked, spun and drawn as it is quite tough and ductile.


Grade 347H stainless steel can be annealed at temperature ranging from 1010 to 1193°C (1850 to 2000°F) and then quenched with water.


Grade 347H stainless steel is unresponsive to heat treatment. The hardness and strength of the steel can be increased through cold working.

Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.