Acid-resistant steel, commonly known as ND steel, is a specialized steel designed for environments exposed to sulfur-containing corrosion.
Among them, 09CrCuSb acid-resistant steel is currently recognized as one of the most effective materials for resisting low-temperature sulfuric acid dew-point corrosion.
In the boiler equipment industry, acid-resistant steel is widely applied, with multiple grades used in heat exchangers, steam generators, and related thermal equipment.
The following section outlines the key features and applications of 09CrCuSb acid-resistant steel.
09CrCuSb acid-resistant steel was specifically developed for coal-fired boilers, oil-fired boilers, and electric furnace systems, where severe sulfuric acid dew-point corrosion is common.
It is suitable for manufacturing heat exchange components, flue pipes, chimneys, boiler air preheaters, economizers, heat exchangers, condensation coolers, and evaporators.
The material is supplied in the form of hot-rolled steel plates and seamless steel pipes, offering reliable performance in corrosive flue gas environments.
With its outstanding resistance to sulfuric acid dew-point corrosion and excellent cost-performance ratio, 09CrCuSb acid-resistant steel is considered an ideal engineering material.
In many applications, it can fully replace stainless steel, and in terms of sulfuric acid dew-point corrosion resistance, it can even outperform conventional stainless steel grades, providing a more economical and efficient solution for industrial use.
What is 09CrCuSb steel?
09CrCuSb, also known as ND steel, is a low-alloy corrosion-resistant steel specially designed for use in acidic dew point corrosion environments. It contains alloying elements such as chromium (Cr), copper (Cu), and antimony (Sb), which significantly enhance its resistance to sulfuric acid and flue gas corrosion.
Why is 09CrCuSb called ND steel?
"ND" stands for Nitric acid and Dew-point corrosion resistance. The steel was developed to withstand low-temperature acid condensation corrosion commonly found in boilers, heat exchangers, and flue gas systems.
Does 09CrCuSb steel have good weldability?
Yes. 09CrCuSb steel has good weldability. Standard welding methods such as SMAW, SAW, and TIG can be used, but low-hydrogen electrodes and proper preheating may be recommended for thicker sections.
Is 09CrCuSb suitable for high-temperature service?
09CrCuSb is mainly designed for medium-temperature environments where acid dew point corrosion occurs. It is not intended for extremely high-temperature pressure vessel applications without proper evaluation.
