ASTM A403 ASME A403 WPS31254 Stainless Steel Seamless Fitting Elbow ASME B16.9

ASTM A403 ASME A403 WPS31254 Stainless Steel Seamless Fitting Elbow ASME B16.9

254SMO is an austenitic stainless steel. Due to its high molybdenum content, it has extremely high resistance to spot corrosion and Crevice corrosion. This grade of stainless steel is developed and developed for use in environments containing halides such as seawater. 254SMO also has good resistance to uniform corrosion. Especially in acids containing halides, this steel is superior to ordinary stainless steel. Its C content is<0.03%, therefore it is called pure austenitic stainless steel (<0.01%, also known as super austenitic stainless steel). Super stainless steel is a special type of stainless steel, which differs from ordinary stainless steel in chemical composition. It refers to a high alloy stainless steel with high nickel, high chromium, and high molybdenum content. Among them, 254SMo containing 6% Mo has excellent local corrosion resistance. Under conditions such as seawater, inflation, presence of gaps, and low-speed erosion, it has good resistance to pitting corrosion (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 more excellent 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.
 

Due to the fact that this type of 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 type of special stainless steel, such as pouring, forging, rolling, and so on.

High temperature resistance
1. A large number of field experiments and extensive use experience show that 254SMO has high Crevice corrosion resistance in seawater even at slightly higher temperatures, and only a few types of stainless steel have this performance.
 

2.The corrosion resistance of 254SMO in acidic solutions and oxidizing halide solutions required for paper bleaching production can be compared to nickel based alloys and titanium alloys with strong corrosion resistance.
 

3.Due to its high nitrogen content, 254SMO has higher mechanical strength than other types of austenitic stainless steel. In addition, 254SMO also has high ductility, impact strength, and good weldability.
 

4.The high molybdenum content of 254SMO can lead to a higher oxidation rate during annealing, resulting in a rougher surface than ordinary stainless steel after pickling. But this has no adverse effect on the corrosion resistance of the steel.

Chemical Components:

Application field:

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