ND钢管 即09CrCuSb 钢是目前国内外理想的“耐硫酸低温露点腐蚀”用钢材（ND钢板，ND钢管，09CrCuSb钢板，09CrCuSb钢管等），ND钢广泛用于制造在高含硫烟气中服役的省煤器，空气预热器，热交换器和蒸发器等装置设备，用于抵御含硫烟气结露点腐蚀。ND钢还具有耐氯离子腐蚀的能力。ND钢管主要的参考指标（70摄氏度50%H2SO4溶液中浸泡24小时），与碳钢，日本进口同类钢，不锈钢耐腐蚀性能相比，要高于这些钢种。产品经国内各大炼油厂和制造单位使用后受到广泛好评，并获得良好的使用效果。具体数据见下表:ND钢腐蚀率比较，mg/c㎡.h(70℃50%H2SO4)钢种 ND CRIR(日本） 1Cr18Ni9 Corten 20G。

ND steel pipes, namely 09CrCuSb steel, are ideal low temperature sulfuric acid dew point corrosion resistant steels (ND steel plate, ND steel pipe, 09CrCuSb steel plate, 09CrCuSb steel pipe, etc.) at home and abroad. ND steel is widely used to manufacture economizers, air preheaters, heat exchangers and evaporators serving in high sulfur-containing flue gas, which are used to resist sulfur-containing dew point corrosion. ND steel also has resistance to chloride ion corrosion. The main reference index of ND steel pipe (soaking in 50% H2SO4 solution at 70 degrees Celsius for 24 hours) is higher than that of carbon steel, similar steel imported from Japan and stainless steel. After being used by major refineries and manufacturing units in China, the products have been widely praised and achieved good results. Specific data can be found in the following table: comparison of corrosion rate of ND steel, mg/c. h (70 C 50% H2SO4) steel ND CRIR (Japan) 1Cr18Ni9 Corten 20G.