What is 347 Stainless Steel and How is it Different?

347 stainless steel round bar is a niobium-stabilized, chromium-nickel austenitic alloy designed for superior corrosion resistance and outstanding performance at elevated temperatures. While it shares many similarities with 304 stainless steel, 347 is specifically engineered to withstand long-term exposure to heat without suffering from intergranular corrosion.

Key Properties of 347 Stainless Steel

High-Temperature Performance – Performs reliably in the 800–1500°F range, where many steels are vulnerable to carbide precipitation.
Stabilized Against Corrosion – Niobium stabilization prevents chromium carbide formation, protecting against intergranular corrosion and maintaining mechanical integrity.
Mechanical Strength – Exhibits excellent creep strength and stress rupture resistance, even in demanding environments.
Toughness & Ductility – Offers good low-temperature toughness and is non-magnetic in the annealed condition.

How 347 Stainless Differs from Other Stainless Steels

Compared to 304 stainless steel, 347 provides enhanced resistance to high-temperature corrosion and carbide precipitation. This makes it better suited for applications involving continuous heat exposure, whereas 304 may lose its mechanical properties over time under similar conditions.

Applications of 347 Stainless Steel Round Bar

Thanks to its stability at elevated temperatures and excellent corrosion resistance, 347 stainless bar stock is commonly used in:

Aerospace components exposed to extreme heat
Boiler and pressure vessel parts
Heat exchangers and furnace equipment
Chemical processing and refinery piping
High-stress industrial components

Partner with Mozaic Precision Metals

At Mozaic Precision Metals, we supply precision-ground 347 stainless steel bar in a range of sizes and finishes. Our value-added services—including grinding, polishing, cutting, and chamfering—ensure your bar stock meets the highest performance and quality standards.

For projects requiring reliable high-temperature stability and superior corrosion resistance, 347 stainless steel from Mozaic is the trusted choice.

347 Stainless Steel Round Bar: Chemical Properties

347 stainless steel is a stabilized austenitic alloy designed for superior corrosion resistance and high-temperature performance. Its chemical composition includes carbon, chromium, nickel, manganese, silicon, phosphorus, sulfur, and niobium.

Carbon (≤ 0.08%): Low carbon content minimizes susceptibility to intergranular corrosion.

Chromium & Nickel: Provide excellent corrosion resistance and oxidation resistance.

Niobium: Stabilizes the alloy against carbide precipitation, enhancing durability at elevated temperatures.

The result is a material that delivers outstanding corrosion resistance, mechanical strength, and high-temperature stability—making it ideal for demanding environments.

Applications of 347 Stainless Steel Bar

347 stainless steel round bar is widely used across industries for its toughness, fatigue strength, and machinability. Common applications include:

Chemical Processing: Equipment exposed to corrosive chemicals and high heat.

Aerospace: Structural elements and engine components requiring stability under stress.

Automotive: Engine parts, exhaust components, and structural fittings.

Forged Steel Construction: Heavy-duty parts exposed to wear and environmental stress.

Food Industry: Equipment exposed to cleaning agents and oxidation-prone environments.

Marine & High-Temperature Applications: Components that must withstand saltwater or thermal cycling.

With its machinability and resistance to both corrosion and oxidation, 347 bar stock is a dependable choice for structural parts, machine components, and fittings across multiple industries.

347 Stainless Steel from Mozaic Precision Metals

At Mozaic Precision Metals, we supply premium-grade 347 stainless steel round bar forged to meet the highest industry standards. Our material offers exceptional strength, corrosion resistance, and long-lasting performance for critical applications.

Why Choose Mozaic Precision Metals?

Leadership team with over 60 years of combined experience in precision grinding and stainless steel supply.

ISO-informed quality practices ensuring consistency and reliability.

Custom processing options including cutting, machining, and finishing to your specifications.

Reliable delivery schedules to keep your projects moving forward.