09CrCuSb Seamless Pipe

09CrCuSb seamless tube is one of the most ideal steel materials for low-temperature sulphuric acid and acidic corrosion environments.
Its typical chemical composition contains Copper (Cu 0.25–0.45%), Chromium (Cr 0.30–0.65%), and a small amount of Antimony (Sb 0.05–0.15%). These alloying elements work synergistically to significantly enhance the steel's corrosion resistance in high-concentration sulphuric acid.

In terms of mechanical properties, 09CrCuSb seamless pipe generally offers a yield strength of ≥245 MPa, tensile strength of ≥410 MPa, and elongation of ≥25%. It maintains excellent corrosion resistance while ensuring reliable mechanical performance.

Corrosion resistance tests show that its corrosion rate in 50% H₂SO₄ solution at 50 ℃ is much lower than that of ordinary carbon steel and low-alloy steel, effectively extending the service life of equipment.

09CrCuSb seamless tube is also known as ND alloy seamless pipe. Common specifications include an outer diameter of Φ20mm – Φ426mm, wall thickness of 2mm – 50mm, and length up to 12m.

It is mainly used in power plant absorption towers, heat exchanger bundles, petrochemical units, and flue gas desulfurization equipment, providing strong resistance to sulphuric acid corrosion and making it particularly suitable for long-term operation environments.

Corrosion Resistance: Acid-resistant steel 09CrCuSb exhibits high resistance to corrosion in acidic environments, making it ideal for applications exposed to acid rain, industrial chemicals, and other corrosive substances. This makes it suitable for use in chemical processing facilities and areas with high air pollution levels.

High Strength: With a high yield strength and tensile strength, acid-resistant steel 09CrCuSb provides robust and reliable performance, making it suitable for various industrial and manufacturing applications.

Good Weldability: The steel offers good weldability, allowing easy joining through common welding techniques, enhancing its versatility in industrial and manufacturing applications.

Resistance to Atmospheric Corrosion: Acid-resistant steel 09CrCuSb surpasses traditional steel in resisting atmospheric corrosion, providing prolonged protection against the effects of rain, snow, and weather conditions without rust or corrosion.

Chemical Composition: Unique chemical composition, including copper, nickel, and chromium, contributes to its corrosion resistance and overall durability.

Low Maintenance: Unlike traditional steel, acid-resistant steel 09CrCuSb requires minimal maintenance, eliminating the need for regular painting or coating to protect against corrosion. This results in reduced overall maintenance costs for industrial structures.

Aesthetically Pleasing: Over time, acid-resistant steel 09CrCuSb develops an attractive patina, providing a natural and rustic appearance that complements industrial and manufacturing environments.

Boiler Economizers & Heat Exchangers – Designed to withstand acidic condensates. Ordinary carbon steel in sulfuric acid condensates corrodes at a rate of 2.0–3.0 mm/year, while 09CrCuSb shows a much lower rate, typically less than 0.1 mm/year, greatly extending the service life of heat exchange equipment.

Flue Gas Desulfurization (FGD) Systems – Ideal for environments with high SO₂ and SO₃ content. Tests demonstrate that in 50% H₂SO₄ solution at 50 ℃, the corrosion rate of 09CrCuSb is significantly lower than that of conventional low-alloy steels, ensuring long-term corrosion resistance.

Waste Heat Recovery Units – Capable of withstanding high temperatures and aggressive flue gas conditions. With a yield strength ≥245 MPa and tensile strength ≥410 MPa, it maintains structural integrity while resisting acidic condensates, reducing shutdowns caused by corrosion leakage.

Power Plant & Industrial Boilers – Superior durability reduces maintenance frequency. Data show that boiler components using 09CrCuSb tubes achieve a service life 3–5 times longer than those made of ordinary carbon steel, effectively lowering overall operating costs.

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