Product introduction

254SMO is an austenitic stainless steel. Because of its high molybdenum content, it has high resistance to spot corrosion and crevice corrosion. This grade of stainless steel is developed for use in environments containing halides such as seawater. 254SMO also has good resistance to uniform corrosion. Especially in acid containing halide, the steel is superior to ordinary stainless steel. Its C content is<0.03%, so it is called pure austenitic stainless steel (<0.01% is 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 refers to a kind of high alloy stainless steel containing high nickel, high chromium and high molybdenum. 254SMo, which contains 6% Mo, has very good local corrosion resistance. Under the conditions of sea water, air inflation, crevice and low-speed scouring, it has good pitting corrosion resistance (PI ≥ 40) and good stress corrosion resistance. It is a substitute material for Ni based alloys and titanium alloys. Secondly, in terms of high-temperature or corrosion resistance, it has better high-temperature or corrosion resistance, which is irreplaceable for 304 stainless steel. In addition, from the classification of stainless steel, the metallographic structure of special stainless steel is a stable austenitic metallographic structure.
As this special stainless steel is a high alloy material, its manufacturing process is quite complex. Generally, people can only rely on traditional processes to manufacture this special stainless steel, such as pouring, forging, rolling, etc.

 

Main components
254SMo carbon (C) ≤ 0.02, manganese (Mn) ≤ 1.00, nickel (Ni) 17.5 ～ 18.5, 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 standards
UNS S31254、DIN/EN 1.4547、ASTM A280、ASME SA-240
 

Supporting welding materials
ERNiCrMo-3 welding wire, ENiCrMo-3 welding rod

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Application area
1. Oceans: marine structures of marine environment, seawater desalination, mariculture, seawater heat exchange, etc.
2. Environmental protection: flue gas desulfurization device for thermal power generation, wastewater treatment, etc.
3. Energy field: atomic power generation, comprehensive utilization of coal, tidal power generation, etc.
4. Petrochemical industry: oil refining, chemical equipment, etc.
5. Food field: salt making, soy sauce brewing, etc.
6. High concentration chloride environment: paper industry, various bleaching devices.