S31254

Material grade: S31254 super austenitic stainless steel

Swedish brand: 254SMO

German brand: 1.4547

Chinese brand: 00Cr20Ni18Mo6CuN

Forging grade: F44

1、 Overview of S31254 (F44254SMO, 1.4547) Super Austenitic Stainless Steel:

S31254 (F44254SMO, 1.4547) is a super austenitic stainless steel. Due to its high molybdenum content, it has extremely high resistance to point corrosion and crevice corrosion. This grade of stainless steel is developed and developed for use in environments containing halides such as seawater. S31254 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%, so 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 that differs from ordinary stainless steel in terms of chemical composition. It refers to a high alloy stainless steel with high nickel, high chromium, and high molybdenum content. One of the most famous is S31254, which contains 6% Mo. This type of steel has excellent resistance to local corrosion and has good resistance to pitting corrosion (PI ≥ 40) and stress corrosion under conditions of seawater, inflation, presence of gaps, and low-speed erosion. It is a substitute material for Ni based alloys and titanium alloys. Secondly, in terms of high temperature or corrosion resistance, it has superior high temperature 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 metallographic structure.

Due to the fact that S31254 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, and seamless steel pipes can also be made through center drilling, cold rolling, or cold drawing.

2、 S31254 (F44254SMO, 1.4547) Super Austenitic Stainless Steel Chemical Composition: See Table-1:

3、 Physical properties of S31254 (F44254SMO, 1.4547) super austenitic stainless steel:

1. S31254 (F44254SMO, 1.4547) stainless steel density: 8.24g/cm3,

2. S31254 (F44254SMO, 1.4547) stainless steel melting point: 1320-1390 ℃,

3. S31254 (F44254SMO, 1.4547) Stainless Steel Magnetism: None

4、 Mechanical properties of S31254 (F44254SMO, 1.4547) super austenitic stainless steel:

1. Mechanical properties: tensile strength: σ b ≥ 650Mpa,

2. Yield strength: σ b ≥ 310Mpa

3. Elongation rate: δ ≥ 40%,

4. Hardness: 182-223 (HB)

5、 S31254 (F44254SMO, 1.4547) Super Austenitic Stainless Steel Corrosion Resistance:

S31254 (F44254SMO, 1.4547) stainless steel is a highly corrosion-resistant super austenitic stainless steel developed for environments with halides and acids. It is widely used in harsh working conditions such as high concentration chloride ion media and seawater. In various industrial applications in acidic media, especially in acid containing halides, S31254 is far superior to other stainless steels, and in some cases can be comparable to Hastelloy and titanium. The lower carbon content and higher molybdenum content give it good resistance to point corrosion and crevice corrosion, as well as excellent resistance to intergranular corrosion. It is a cost-effective stainless steel widely used in chemical, desulfurization, and environmental protection fields both domestically and internationally.

6、 S31254 (F44254SMO, 1.4547) super austenitic stainless steel matching welding material:

Welding wire: ERNiCrMo-3, welding rod: ENiCrMo-3.

7、 Application areas of S31254 (F44254SMO, 1.4547) super austenitic stainless steel:

1. Ocean: 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 sector: Atomic power generation, comprehensive utilization of coal, tidal power generation, etc. 4. Petrochemical industry: refining, chemical equipment, etc. 5. Food industry: salt production, soy sauce brewing, etc. 6. High concentration chloride ion environment: papermaking industry, various bleaching devices

8、 Corrosion performance of S31254 (F44254SMO, 1.4547) super austenitic stainless steel:

1. Numerous on-site experiments and extensive usage experience have shown that even at slightly higher temperatures, S31254 has high resistance to crevice corrosion in seawater, with only a few types of stainless steel exhibiting this performance.

2. The corrosion resistance of S31254 in acidic solutions and oxidizing halide solutions required for paper bleaching production is comparable to that of nickel based alloys and titanium alloys, which have the strongest corrosion resistance.

3. Due to its high nitrogen content, S31254 has higher mechanical strength than other types of austenitic stainless steel. In addition, S31254 also has high ductility, impact strength, and good weldability.

4. The high molybdenum content of S31254 enables it to have 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.

9、 Variety specifications and supply status of S31254 (F44254SMO, 1.4547) super austenitic stainless steel:

1. Product classification: Special alloys can produce various specifications of S31254 seamless pipes, S31254 steel plates, S31254 round steels, S31254 forgings, S31254 flanges, S31254 rings, S31254 welded pipes, S31254 steel strips, S31254 wire materials, and S31254 matching welding materials.

2. Delivery status: Seamless pipe: solid solution+acid white, length can be customized; Board: solid solution, acid washing, edge cutting; Welded pipes: solid solution acid white+RT% inspection, forgings: annealing+turning light; The bar is in a forged and rolled state, with a polished or turned surface; The strip is delivered after cold rolling, solid solution in a soft state, and descaling; Silk materials are delivered in a solid solution acid washed dish or straight strip shape, and in a solid solution straight strip finely polished state.