Stainless Steel 347 Properties

Home / Technical / Properties

Stainless Steel 347 Properties

At Ferrobend, we provide high-performance Stainless Steel 347 products, crafted for industries that require materials capable of withstanding extreme conditions. Known for its excellent resistance to oxidation, corrosion, and high-temperature environments, SS 347 is an ideal choice for applications in sectors like petrochemical, aerospace, power generation, and chemical processing. The addition of columbium (niobium) in SS 347 ensures outstanding resistance to intergranular corrosion and minimizes the risks associated with sensitization, making it a reliable solution for critical applications.


Ferrobend’s Stainless Steel 347 offers exceptional durability and strength, even at elevated temperatures, making it the perfect material for applications such as heat exchangers, boilers, exhaust systems, and reactor cores. Its ability to maintain structural integrity and resist aggressive chemicals at high temperatures ensures that SS 347 remains a trusted choice for industries that require longevity and reliability.


Our Stainless Steel 347 products are available in a wide range of forms, including pipes, tubes, bars, and sheets, and can be customized to meet your project’s specific requirements. With a commitment to quality, Ferrobend ensures that every piece of SS 347 meets the highest industry standards.

When you choose Ferrobend for your Stainless Steel 347 needs, you’re selecting a trusted supplier known for its precision, customer satisfaction, and high-quality materials. Whether for fabrication, installation, or specialized applications, Ferrobend’s SS 347 products provide unmatched performance and reliability.

Chemical Properties:

Elements Cr Ni C Si Mn P S Mo Fe
% min: 17.0 ,max:19.0 min: 8.0 ,max: 10.0 0.15 max 1.00 max 2.0 max 0.20 max 0.15 min 0.75 balance

Mechanical Properties:

Tensile Strength ksi (min.) Yield Strength 0.2% Offset ksi (min.) Elongation - % in 50 mm (min.) Hardness (Brinell) MAX Hardness (Rockwell B) MAX
75 30 35 228 -

Physical Properties:

Denstiy lbm/in3 Coefficient of Thermal Expansion (min/in)-°F Electrical Resistivity mW-in Thermal Conductivity BTU/hr-ft-°F Melting Range
at 68 °F at 68 – 212°F at 68 – 932°F at 68 – 1450°F at 68°F at 212°F at 392°F at 752°F at 1112°F at 1472°F at 68 – 212°F -
0.29 9.2 10.4 10.9 28.3 30.7 33.8 39.4 43.7 47.6 113.2 2552°F

Equivalent Grades and Designations:

SAE / AISI 303
UNS S30300
EN Material Number 1.4305
EN Material Name X8CrNiS18-9
DIN Material Name X8CrNiS18-9
JIS SUS 303
BS 202S 21 En58M

Heat Resistance:

  • Good oxidation resistance at temperatures up to 1700oF (927 oC)
  • Continuous use at temperatures above 1400oF (760oC) is not usually recommended due to carbide precipitation which can lead to irregular scaling
  • Does not have a low carbon content so it is also vulnerable to sensitization

Welding Characteristics:

  • Not generally recommended, but may be welded with some difficulty
  • May be welded with Alloy 310 electrodes
  • Should be annealed after welding to re-dissolve precipitated carbides

Machinability:

  • High machining rates can be obtained in the annealed condition with hardness in the range of 200 to 240 Brinell
  • Will work harden; therefore, it should be machined at reduced surface feet per minute and heavier feeds to prevent glazing at the tool interface.

Applications:

  • Nuts and bolts
  • Aircraft fittings
  • Gears
  • Screws
  • Shafts
  • Electrical switchgear components
  • Bushings