Stainless Steel 347H Pipes Exporters in India

Stainless Steel 347H pipes are highly regarded for their excellent performance in high-temperature and corrosive environments. With 20 years of experience in metallurgy and industrial applications, this article provides an in-depth look at the properties, applications, and manufacturing nuances of Stainless Steel 347H pipes.

What Are Stainless Steel 347H Pipes?

Stainless Steel 347H is an austenitic stainless steel alloy enriched with stabilization elements such as columbium (niobium) and tantalum. These elements help stabilize the structure against chromium carbide precipitation during welding or prolonged exposure to temperatures between 450°C and 900°C. The "H" grade signifies higher carbon content (0.04 to 0.10%) compared to standard 347, enhancing its strength in elevated temperature applications.

Composition and Mechanical Properties

Typical chemical composition includes:

• Carbon: 0.04–0.10%

• Chromium: 17.0–20.0%

• Nickel: 9.0–13.0%

• Columbium (Niobium) + Tantalum: Minimum 10 times the carbon content

• Manganese, Silicon, Phosphorus, Sulfur present in small controlled limits for enhanced performance.

Mechanical properties:

• Tensile Strength: Minimum 515 MPa

• Yield Strength: Minimum 205 MPa

• Elongation: Approximately 35-40%

• Hardness: Brinell max 201, Rockwell B max 92

• Density: Approximately 8.0 g/cm³

• Suitable for continuous service in temperatures up to 870°C.

Applications

Stainless Steel 347H pipes are widely used in critical industrial sectors:

• Power plants and superheaters, thanks to their excellent creep and stress rupture properties at elevated temperatures.

• Chemical and petrochemical industries, for process piping exposed to high corrosion and thermal stress.

• Oil and gas sectors, especially for pipelines requiring high strength and temperature resistance.

• Aerospace, pharmaceuticals, pulp, and paper industries where durability in aggressive environments is essential.

Manufacturing and Standards

These pipes are manufactured using seamless and welded techniques such as Electric Fusion Weld (EFW), Electric Resistance Weld (ERW), and others. Common specifications include ASTM A312, ASTM A213, and ASME SA312 for seamless pipes and tubes.

Pipes come in various dimensions and thicknesses (Schedules 5 through 160 or customized), with multiple finishing options including hot finished, annealed & pickled, bright annealed, and polished. They are subjected to rigorous testing like hydrostatic, hardness, chemical, mechanical, and non-destructive tests (radiography, ultrasonic) to ensure high quality.

Advantages of 347H Pipes

• Superior resistance to intergranular corrosion due to stabilization with niobium/tantalum.

• High strength retention and dimensional stability in extreme conditions.

• Excellent weldability and thermal fatigue resistance.

• Excellent oxidation, pitting, and crevice corrosion resistance in harsh environments.

In conclusion, Stainless Steel 347H pipes combine strength, corrosion resistance, and thermal stability, making them indispensable for many industrial applications where reliability at high temperatures is critical. Their robust chemical composition, adherence to international standards, and extensive applications highlight their importance in industrial infrastructure.

https://www.nehametalalloys.com/stainless-steel-347-seamless-welded-pipes-manufacturer-exporter.html

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