Sandmeyer Stainless Steel Alloy 347H Datasheet

Wrought Stainless Steel

Supplied by Sandmeyer Steel Company

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Product Description
Alloy 347 (UNS S34700) is a columbium stabilized austenitic stainless steel with good general corrosion resistance and somewhat better resistance in strong oxidizing conditions than 321 (UNS S32100). It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 - 1500°F (427 - 816°C). The alloy has good oxidation resistance and creep strength to 1500°F (816°C). It also possesses good low temperature toughness.

Alloy 347H (UNS S3409) is the higher carbon (0.04 - 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000°F (537°C). In most instances, the carbon content of the plate enables dual certification.

Alloy 347 cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.

Applications
  • Chemical Processing
  • Food Processing - equipment and storage
  • Petroleum Refining - fluid catalytic cracking units, polythionic acid service
  • Waste Heat Recovery - recuperators
General  
Material Status 
  • Commercial: Active
Availability 
  • Africa & Middle East
  • Asia Pacific
  • Europe
  • Latin America
  • North America
Available Documents
Technical Datasheet (English)
Metals General
Nominal Value
Unit
 
Applicable Specifications
 
 
Forms Available
 
 
Metal Type
 
 
Alloy Identification
 
 
Metals Type Analysis
Nominal Value
Unit
 
Type Analysis
     
Carbon
%
 
Chromium
%
 
Columbium + Tantalum
%
 
Iron (Balance)
%
 
Manganese
%
 
Nickel
%
 
Phosphorus
%
 
Silicon
%
 
Sulfur
%
 
Metals Physical
Nominal Value
Unit
 
Density
lb/in³
 
Metals Mechanical
Nominal Value
Unit
 
Tensile Strength (Ultimate)
ksi
 
Tensile Strength (Yield), 0.2%
ksi
 
Tensile Elongation (Break)
%
 
Hardness (HB-Scale)
 
 
Tensile Modulus
ksi
 
Metals Thermal
Nominal Value
Unit
 
Mean Specific Heat (32 to 212°F)
Btu/lb/°F
 
Mean CTE (68 to 212°F)
in/in/°F
 
Thermal Conductivity (212°F)
Btu·in/hr/ft²/°F
 
Metals Electrical
Nominal Value
Unit
 
Electrical Resistivity (68°F)
ohms·cir·mil/ft
 
Notes
1Typical properties: these are not to be construed as specifications.
 
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