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Murdoch Road, Bilston, West Midlands, WV14 7HG

T: +44 (0)1902 404 221

sales@dswilletts.co.uk

347/347H

347 stainless steel is variant of the basic austenitic 18/8 Grade 304 with added Columbium – the introduction of Columbium stabilises the steel and eliminates carbide precipitation which subsequently causes intergranular corrosion. This steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures.

Benefits of 347 Stainless Steel

  • Higher creep stress and rupture properties when compared with 304
  • Ideal for high temperature service
  • Overcomes sensitization and intergranular corrosion concerns
  • Can be used in elevated temperature applications for ASME Boiler and Pressure Vessel Code applications
  • Due to stabilisation the material offers better overall corrosion resistance when compared to 304/304L
  • Excellent mechanical properties
  • A high carbon version (347H) is also available

 Material Equivalents

UNS S34700S34709
EN1.45501.4961
ASTM347347H

 Mechanical Properties

347347H
Proof Stress 0.2% (MPa)205 MPa (min) - (max) Not Specified205 MPa (min) - (max) Not Specified
Tensile Strength 515 MPa 515 MPa
Elongation A540%40%
Hardness (Maximum)HBW : 201
HRBW : 92		HBW : 201
HRBW : 92

 Chemical Composition

347347347H347H
ElementSymbolMin (%)Max (%)Min (%)Max (%)
CarbonC-0.08
ManganeseMn-2.0
PhosphorusP-0.045
SulphurS-0.03
SiliconSi-0.75
ChromiumCr17.019.0
NickelNi9.012.0
Titanium Ti5 × (C + N) min0.70
Nitrogen N-0.10
IronFeBalance Balance

 Common Industries

  • Power generation
  • Petrochemical
  • Oil and gas
  • Chemical processing
  • Aerospace
  • Pharmaceutical
  • Food processing
  • Industrial furnaces
  • Thermal processing

Our 347/347H Stock

Our 347/347H Stock ranges from 1.5MM to 50MM Thick – Available in Plates & Profiles to your requirements.

All our material is supplied fully certified with EN10204 3.1 or 3.2 certificates as needed. Additional client or third party inspections of material is also available on request with all our material.

We also have our own dedicated quality department that take regular audits of our products and internal processes to ensure that the highest of quality is maintained throughout. To demonstrate this, we are certified to ISO 9001.