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347H Stainless Steel Sheet & Plate

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347H Stainless Steel Sheet & Plate (UNS S34709,1.4550)

347H stainless steel is a high-carbon version of 347 stainless steel, which is austenitic and stabilized. This alloy is used in high-temperature environments due to its excellent resistance to oxidation and corrosion, especially in environments involving sulfuric acid and other aggressive chemicals.

 

Key Properties of 347H Stainless Steel Sheet & Plate:

  • High Carbon Content: 347H has a higher carbon content than 347, enhancing its high-temperature strength.
  • Corrosion Resistance: It resists intergranular corrosion, making it ideal for high-temperature applications.
  • Good Weldability: Due to its stabilization with columbium (niobium), it offers excellent weldability and is resistant to weld decay.
  • Temperature Resistance: Suitable for continuous use at temperatures of up to 1650°F (899°C).

 

Technical Specifications

  • UNS Number: S34709
  • DIN/EN Designation: 1.4550

Available Thickness

3/16″1/4″5/16″3/8″1/2″5/8″3/4″7/8″1″1 1/8″
4.8mm6.3mm7.9mm9.5mm12.7mm15.9mm19mm22.2mm25.4mm28.6mm
1 1/4″1 1/2″1 3/4″2″2 1/4″2 1/2″2 3/4″3″3 1/2″4″
31.8mm38.1mm44.5mm50.8mm57.2mm63.5mm69.9mm76.2mm88.9mm101.6mm
347h-stainless-steel-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M
  • ASME SA312 / SA312M

Corrosion Resistance

  • Intergranular Corrosion: 347H has superior resistance to intergranular corrosion compared to some other stainless steels, thanks to its stabilization with titanium. This makes it suitable for use in applications where sensitization (which can lead to intergranular corrosion) might be a concern.
  • Oxidation Resistance: It performs well in oxidizing environments and can withstand temperatures up to around 1500°F (815°C) without significant loss of mechanical properties. This makes it suitable for applications in high-temperature environments, such as in exhaust systems and chemical processing.
  • Sulfuric Acid and Chloride Resistance: While 347H offers some resistance to sulfuric acid, it is not as resistant as more specialized grades such as 904L or alloys with higher nickel content. In chloride environments, like seawater, it is less resistant compared to grades like 316L or 254SMO, which are more resistant to pitting and crevice corrosion.
  • Stress-Corrosion Cracking: 347H has better resistance to stress-corrosion cracking compared to some other stainless steels, making it suitable for use in high-stress environments.

Worldwide Equivalent Grade 347H

Country
Standard
Grade 
USA
ASTM
347H
USA
UNS 
S34709
EU
EN 
X10CrNiNb18-10
Germany
DIN
1.4912
Japan
JIS 
SUS 347H
BS
BS
347H (BS 1449)
Russia
GOST 
12Cr18Ni10Nb

347H Chemical Composition

ElementTypical Composition (% by Weight)
Carbon (C)0.04 – 0.10
Chromium (Cr)17.00 – 19.00
Nickel (Ni)9.00 – 12.00
Molybdenum (Mo)0.00 – 0.00
Manganese (Mn)0.00 – 2.00
Silicon (Si)0.00 – 0.75

347H Physical Properties

Property Typical Value
Density 8.03 g/cm³ (8030 kg/m³)
Melting Point 1400 – 1450°C (2550 – 2650°F)
Thermal Conductivity 16.3 W/m·K (at 100°C)
Specific Heat Capacity 500 J/kg·K (at 25°C)
Modulus of Elasticity 193 – 200 GPa (28 – 29 x 10^6 psi)
Poisson’s Ratio 0.27 – 0.30

347H Mechanical Properties

PropertyTypical Value
Yield Strength (0.2% offset)310 – 550 MPa (45 – 80 ksi)
Tensile Strength550 – 860 MPa (80 – 125 ksi)
Elongation (in 50 mm)20 – 35%
Hardness (Rockwell B)85 – 95 HRB
Hardness (Brinell)200 – 250 HB
Modulus of ResilienceApproximately 150 – 180 MPa (22 – 26 ksi)

Fabrication Data

Machining: Stainless steel 347H can be machined using standard tools. It’s recommended to use sharp tools and maintain a low cutting speed with high feed rates. Coolant or lubrication is advised to avoid work hardening and ensure a better finish.

Welding:

  • Filler Material: Use 347H filler material or a suitable equivalent like ER347.
  • Preheat: Generally, preheating isn’t required for this grade, but it can help in preventing cracking.
  • Post-Weld Heat Treatment: Stress relieving or annealing at 870-920°C (1600-1688°F) is often recommended to reduce residual stresses and improve mechanical properties.

Forming: This material can be hot-formed or cold-formed. If hot-forming, the recommended temperature range is 870-1200°C (1600-2192°F). Cold-forming should be done with proper tools and techniques to avoid excessive work hardening.

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