Does Anyone Know The Specific Uses Of 904L Stainless Steel?

Does anyone know the specific uses of 904L stainless steel?

904L (1.4539) application fields: It has good activation-passivation transition ability, corrosion resistance, good corrosion resistance in non-oxidizing acids such as H2SO4, CH3COOH, HCOOH, H3PO4, and neutral chloride ions. It has good resistance to pitting corrosion in the medium, as well as good resistance to crevice corrosion and stress corrosion. It is suitable for various concentrations of H2SO4 below 70°C. It can withstand any concentration and temperature of CH3COOH under normal pressure and has good corrosion resistance in mixed acids of HCOOH and CH3COOH.

1. 904L is widely used in petroleum and petrochemical equipment, such as reactors. In petrochemical equipment, 904L stainless steel can withstand harsh working environments such as high temperature, high pressure, and strong acid, and shows excellent corrosion resistance and wear resistance. Therefore, it is widely used in containers, pipes, valves and other components in the chemical production process.

2. 904L is also widely used in sulfuric acid storage and transportation equipment, such as heat exchangers. Since sulfuric acid is a strong acid, it is extremely corrosive to materials, but 904L stainless steel has excellent sulfuric acid corrosion resistance and can maintain the stability and durability of the material during the storage and transportation of sulfuric acid.

3. 904L has also been widely used in power plant flue gas desulfurization devices. In flue gas desulfurization devices, 904L stainless steel is often used in the tower body, flue, door panels, internal parts, spray systems and other parts of the absorption tower because of its superior corrosion resistance in high temperature, high humidity, and strong acid environments. , can maintain the long-term stable operation of the equipment.

4. 904L is also used in scrubbers and fans in organic acid treatment systems, seawater treatment devices, seawater heat exchangers, paper industry equipment, sulfuric acid, nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment, It has been widely used in pharmaceutical factory centrifuges, reactors and other fields.

5. In terms of welding, the supporting welding consumables of 904L include welding rod (E385-1617) and welding wire (ER385). When welded with 904L stainless steel, these welding materials can maintain good compatibility and high corrosion performance of the weld, ensuring the reliability and durability of the welded joint. The metallographic structure of 904L is a completely austenitic structure. Compared with other austenitic stainless steels with higher molybdenum content, 904L is not sensitive to the precipitation of ferrite and α phase, so it has better performance in high temperature and high pressure environments. Good corrosion resistance.