ND steel

09CrCuSb steel is currently the ideal material for "low-temperature dew point corrosion resistance in sulfuric acid" both domestically and internationally. ND steel is widely used in the manufacture of economizers that operate in high-sulfur flue gas.

Equipment such as heat exchangers and evaporators, used to prevent corrosion caused by condensation at the dew point of sulfur-containing flue gas. ND steel also possesses resistance to chloride ion corrosion. The main reference specifications for ND steel pipes (at 70°C and 50% H2)

Soaked in SO4 solution for 24 hours), the corrosion resistance is superior to carbon steel, Japanese imported similar steel, and stainless steel. After being used by major domestic oil refineries and manufacturing units, the product has received widespread acclaim.

Generally well-received, with a lower carbon content in the steel, yielding good performance. Specific data is shown in the table below:

ND steel corrosion rate comparison, mg/cm².h (70°C, 50% H₂SO₄)

Steel Grades: ND CRIR (Japan) 1Cr18Ni9 Corten 20G

Corrosion Rate: 7.30, 13.40, 21.70, 63.00, 103.50

Application

Widely used in power plants and refineries, these economizers, air preheaters, heat exchangers, and evaporators are designed to operate in high-sulfur flue gas and resist condensation corrosion caused by sulfur-containing flue gas.

Standard

Q/TDGG0039-2004-----Industrial Internal Standard

GB 150.2-2011 - Part 2 of Pressure Vessels