09CrCuSb(ND Steel) seamless steel tube for sulfuric acid resistance
The low-alloy ND steel 09CrCuSb, 09 chromium copper antimony,which is resistant to sulfuric acid dew point corrosion for seamless steel tubes, plates, forgings and special welding materials, was prepared by smelting in ultra-high power electric furnace, refining outside furnace and vacuum degassing. It is characterized by the formation of a dense passivation film rich in Cr, Cu, Sb and Ti on its surface during the corrosion process, so it has a high anticorrosion ability.
ND steel is a low alloy structural steel.Compared with other types of steel such as mild steel, Corten, CR1A, ND steel has excellent corrosion resistance and mechanical properties.
Because the ND steel can form the fine and close passive film that several times of matrixes are rich in elements such as Cr, Cu, Sb, Ti that is higher than of one deck densification on its surface in corrosion process, thereby has the ability of high sulfuric-resisting dew point corrosion.Test shows that in 70 ℃ of 50% aqueous sulfuric acid, the ability of the anti-uniform corrosion of ND steel of the present invention is 10 times of 20g soft steel, is 304 stainless 3 times, is 1.5 times of Japanese similar steel grade CR1A
09CrCuSb (ND steel) steel pipe tube used in power plants and refineries to manufacture economizers, air preheaters, heat exchangers and evaporators that work in high-sulfur flue gas to protect against sulfur-containing flue gas condensation.
09CrCuSb Chemical Composition
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Grade
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Composition(%)
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|||||||
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C
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Si
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Mn
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Cr
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Cu
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Sb
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P
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S
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09CrCusb
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≤0.10
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0.20-0.40
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0.35-0.65
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0.70-1.20
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0.25-0.45
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≤0.10
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≤0.10
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≤0.
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09CrCuSb Mechanical Properties
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Grade
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Tensile strength(Mpa)
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Yield strength(Mpa)
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Percentage elongation(A %)
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09CrCuSb
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390-550
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≥245
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≥25
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09CrCuSb tube Applications
The exceptional corrosion resistance of 09CrCuSB steel makes it an indispensable material in industries exposed to harsh environments. Power generation plants extensively utilize ND steel pipes for fabricating economizers, air preheaters, and heat exchangers, where resistance to sulfurous flue gases is paramount. The chemical and petrochemical sectors also rely on ND steel for constructing pipelines, reactors, and heat exchangers that handle corrosive fluids. Moreover, the marine and offshore industries leverage the material’s durability for fabricating components exposed to seawater and other aggressive environments.
09CrCuSb tube Specification:
| Specification | Specification |
| 19*2-4mm | 76-114 * 4-10mm |
| 25 * 2-4mm | 133-140 * 6-14mm |
| 32 * 2-5mm | 159-219 * 21-35mm |
| 38-42 * 3-5mm | 273-325 * 7-50mm |
| 51-63 * 3-5mm | 356-630 * 10-20mm |
What are the Typical Applications of 09CrCuSb Tubes?
Boiler Economizers & Heat Exchangers – Handles acidic condensates
Flue Gas Desulfurization (FGD) Systems – Corrosion-resistant for SO₂ exposure
Waste Heat Recovery Units – Withstands aggressive flue gas environments
Power Plant & Industrial Boilers – Reduces maintenance costs due to superior durability
09CrCuSb is a low-alloy corrosion-resistant steel tube, also known as ND Steel (耐硫酸露点腐蚀钢). It is specifically designed to resist sulfuric acid dew-point corrosion, making it ideal for heat exchangers, economizers, and flue gas desulfurization (FGD) systems.
Excellent resistance to sulfuric acid condensation corrosion
High strength and good toughness
Commonly used in power plants, chemical processing, and boilers
