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347 Stainless Steel Bar

347 stainless steel bar is a niobium-stabilized austenitic stainless steel designed for high-temperature and corrosion-resistant environments.

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347 Stainless Steel Bar

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Stainless Steel Profile

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Product Details

347 Stainless Steel Bar: Performance Breakdown and Common Applications

347 stainless steel bar is a niobium-stabilized austenitic stainless steel designed for high-temperature and corrosion-resistant environments. It is an upgraded version of 304/321-type stainless steels, offering improved resistance to intergranular corrosion after welding and superior performance under elevated temperatures.

Because of its stability and heat resistance, 347 stainless steel is widely used in aerospace, chemical processing, power generation, and heat exchanger systems where both corrosion resistance and thermal stability are required.

1. 347 Stainless Steel Chemical Composition (Performance Basis)

Element	Typical Content (%)	Function
Chromium (Cr)	17–19%	Forms passive layer for oxidation and corrosion resistance
Nickel (Ni)	9–13%	Improves toughness and stability of austenitic structure
Niobium (Nb)	10×C min (stabilized)	Prevents carbide precipitation and improves weld stability
Carbon (C)	≤0.08%	Controlled to balance strength and weldability

2. Key Performance Characteristics of 347 Stainless Steel Bar

Property	Performance Description
High-temperature resistance	Stable performance up to ~800–900°C
Intergranular corrosion resistance	Excellent due to niobium stabilization
Weldability	Very good, suitable for heavy welding structures
Oxidation resistance	Strong resistance in high-temperature environments
Mechanical strength	Stable under thermal cycling conditions

3. Performance Breakdown (Why 347 Is Special)

Niobium stabilization: Prevents chromium carbide formation during welding
High chromium content: Ensures strong oxidation resistance
Nickel addition: Maintains austenitic structure at high temperature
Thermal stability: Performs well under repeated heating and cooling cycles

These characteristics make 347 stainless steel more suitable for high-temperature welded structures compared to standard 304 stainless steel.

4. Common Applications of 347 Stainless Steel Bar

Industry	Application
Power generation	Boiler parts, superheater tubes, steam systems
Chemical processing	Heat exchangers, reactor components
Aerospace	High-temperature structural components
Oil & gas	High-temperature pipelines and fittings
Industrial furnaces	Heat-resistant support structures

5. 347 vs 304 Stainless Steel (Key Difference)

Property	304	347
High-temperature stability	Moderate	High
Weld corrosion resistance	Lower	Excellent
Stabilizing element	None	Niobium (Nb)
Best application	General use	High-temperature welded structures

6. Teda Ganghua Stainless Steel Supply Capability

As a professional stainless steel supplier, Teda Ganghua provides 347 stainless steel bars with stable chemical composition, precise dimensional control, and reliable mechanical performance. Our products are widely used in high-temperature and corrosion-resistant industrial systems.

We support cutting, heat treatment, machining, and customized fabrication services for engineering applications.

Explore our stainless steel products here: Stainless Steel Products

Conclusion

347 stainless steel bar is a high-performance stabilized stainless steel designed for high-temperature and welded environments. Its niobium stabilization significantly improves corrosion resistance after welding, making it ideal for demanding industrial applications.