What is 254SMO steel pipe

Time:9/11/2020 1:32:00 PM

254SMO is an austenitic stainless steel. Because of its high molybdenum content, it has high resistance to pitting corrosion and crevice corrosion. This grade of stainless steel is developed for use in Productions containing halides such as seawater. 254SMO also has good uniform corrosion resistance. Especially in the acid containing halide, the steel is superior to ordinary stainless steel. Its C content is & lt; 0.03%, so it is called pure austenitic stainless steel (& lt; 0.01% also called super austenitic stainless steel). Super stainless steel is a kind of special stainless steel, which is different from ordinary stainless steel in chemical composition. It is a kind of high alloy stainless steel with high nickel, high chromium and high molybdenum. Among them, 254SMO containing 6% Mo is well-known. This kind of steel has very good local corrosion resistance. It has good pitting corrosion resistance (PI ≥ 40) and good stress corrosion resistance under the conditions of seawater, aeration, crevice and low velocity erosion. It is a substitute for Ni based alloy and titanium alloy. Secondly, in terms of high temperature resistance or corrosion resistance, it has better high temperature resistance or corrosion resistance, which is irreplaceable by 304 stainless steel. In addition, from the classification of stainless steel, the metallographic structure of special stainless steel is a stable austenite microstructure. Because this kind of special stainless steel is a kind of high alloy material, its manufacturing process is quite complicated. Generally, people can only make this kind of special stainless steel by traditional technology, such as pouring, forging, calendering and so on.

nbsp; carbon (c) ≤ 0.02,

manganese (MN) is ≤ 1.00,

nbsp; nickel (Ni) is 17.5 ~ 18.5,

manganese silicon (SI) ≤ 0.8

phosphorus (P) ≤ 0.03,

Sulfur (s) ≤ 0.01,

chromium (CR) 19.5-20.5,

copper (Cu) 0.5-1.0,

Molybdenum (MO) 6.0-6.5

national standard: UNS s31254, DIN / en 1.4547, ASTM A280, ASME sa-280

supporting welding materials: ERNiCrMo-3 welding wire, enicrmo-3 welding rod

application fields:

1. Ocean: marine structure, desalination, mariculture, seawater heat exchange, etc. Productional protection: flue gas desulfurization device of thermal power generation, wastewater treatment, etc. Energy field: atomic power generation, comprehensive utilization of coal, ocean tide power generation, etc. Petrochemical Industry: refining, chemical equipment, etc. Food industry: salt making, soy sauce brewing, etc. High concentration of chloride ion Production: paper industry, various bleaching equipment


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