Why Choose SS 347 & 347H Heat Exchanger Tubes for Industrial Use?

When it comes to handling high-temperature applications with exceptional resistance to corrosion and thermal fatigue, Stainless Steel 347 and 347H Heat Exchanger Tubes are among the most reliable materials in industrial use today. These stabilized austenitic stainless steels are engineered to perform in extreme environments, offering outstanding service life and performance across various industries like petrochemicals, power generation, oil refining, and aerospace.

What Are Stainless Steel 347 and 347H?

Stainless Steel 347 is a niobium-stabilized grade of austenitic stainless steel, providing enhanced resistance to intergranular corrosion. This makes it ideal for services that involve continuous or intermittent exposure to temperatures in the chromium carbide precipitation range (approximately 427°C to 816°C).

Stainless Steel 347H, on the other hand, is the high-carbon version of 347, designed for improved creep resistance and higher strength at elevated temperatures. The "H" stands for "high carbon," which allows this alloy to withstand long-term heat exposure more effectively.

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Key Features of SS 347/347H Heat Exchanger Tubes

1. Excellent High-Temperature Strength

Both 347 and 347H tubes exhibit outstanding mechanical properties at elevated temperatures, making them suitable for heat exchangers used in high-pressure and high-temperature operations.

2. Superior Resistance to Corrosion

The presence of niobium (columbium) in these grades helps resist intergranular corrosion and oxidation, especially in environments prone to thermal cycling.

3. Creep Resistance

SS 347H, in particular, has superior creep strength, making it highly reliable for prolonged exposure to extreme heat in heat exchanger systems.

4. Good Weldability

These alloys offer excellent weldability, which is essential when constructing or repairing complex heat exchanger systems.

5. Stress Rupture and Creep Resistance

Their chemical composition ensures that they can maintain structural integrity under long-term stress conditions at high temperatures.

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Applications of Stainless Steel 347/347H Heat Exchanger Tubes

Stainless Steel 347/347H heat exchanger tubes are widely used in:

• Petrochemical plants

• Power generation boilers and superheaters

• Aerospace and jet engine components

• Oil refineries

• Nuclear and thermal power plants

• Chemical processing units

• Pharmaceutical industries

These applications demand materials that can withstand fluctuating temperatures, pressure loads, and chemical exposure — which 347 and 347H handle exceptionally well.

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Why Choose 347/347H Over Other Grades?

• Compared to 304 or 316, SS 347/347H offers better high-temperature stability.

• Niobium stabilization prevents sensitization — the formation of chromium carbides — which is a common issue in unstabilized stainless steels.

• For critical applications where welding is required in high-heat environments, 347/347H are preferred due to their resistance to post-weld intergranular corrosion.

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Sourcing from Trusted Manufacturers

When sourcing SS 347/347H Heat Exchanger Tubes, it's essential to work with a reliable manufacturer and exporter that complies with international standards such as ASTM A213, ASTM A312, and ASME SA213. Quality heat exchanger tubes should offer:

• Precision dimensions and smooth finishes

• Thorough testing including hydrostatic, eddy current, and PMI

• Certification and traceability of materials

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Final Thoughts

If your operations involve aggressive environments with high heat and corrosive agents, Stainless Steel 347 and 347H Heat Exchanger Tubes offer an ideal combination of strength, durability, and corrosion resistance. These alloys are built to last, ensuring efficient heat transfer, operational safety, and reduced maintenance costs.

Choose the right partner for your industrial needs and invest in premium quality SS 347/347H tubes to ensure long-term performance and peace of mind.