| Application: | Industrial |
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| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier F44 is an austenitic stainless steel.
Due to its high molybdenum content, it has extremely high resistance to pitting and crevice corrosion. This grade of stainless steel was developed and developed for use in halide-containing environments such as seawater. f44 also has good resistance to uniform corrosion. Especially in halide-containing acids, the steel is superior to ordinary stainless steel. Its C contains <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. First of all, it is different from ordinary stainless steel in chemical composition. It refers to a high alloy stainless steel containing high nickel, high chromium and high molybdenum. Among them is f44 containing 6% Mo. This type of steel has very good local corrosion resistance, and has good pitting corrosion resistance (PI≥40) and good corrosion resistance under the conditions of seawater, gas, crevices, and low-speed scouring. Stress corrosion resistance, is a substitute for Ni-based alloys and titanium alloys. Secondly, in terms of high temperature resistance or corrosion resistance, it has better high temperature resistance 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 austenite metallographic structure.
Since this special stainless steel is a high-alloy material, the manufacturing process is quite complicated. Generally, people can only rely on traditional processes to manufacture this special stainless steel, such as infusion, forging, rolling and so on.
Main components: f44 contains 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-280
Supporting welding consumables: ERNiCrMo-3 welding wire, ENiCrMo-3 welding rod
Application areas:
1. Ocean: marine structures in the marine environment, seawater desalination, seawater aquaculture, seawater heat exchange, etc.
2. Environmental protection field: flue gas desulfurization device for thermal power generation, wastewater treatment, etc.
3. Energy field: nuclear power generation, comprehensive utilization of coal, ocean tide power generation, etc.
4. Petrochemical field: oil refining, chemical and chemical equipment, etc.
5. Food field: salt making, soy sauce brewing, etc.
6. High-concentration chloride ion environment: paper industry, various bleaching devices
High temperature resistance
1. A large number of field experiments and extensive use experience have shown that even at slightly higher temperatures, f44 has high crevice corrosion resistance in seawater, and only a few types of stainless steel have this performance.
2. The corrosion resistance of f44 in acid solutions and oxidative halide solutions such as those required for paper bleaching production can be compared with nickel-based alloys and titanium alloys with strong corrosion resistance.
3. Due to the high nitrogen content of f44, its mechanical strength is higher than other types of austenitic stainless steels. In addition, f44 also has high ductility and impact strength and good weldability.
4. The high molybdenum content of f44 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 detrimental effect on the corrosion resistance of the steel.
chemical composition:
Carbon C: ≤0.02
Silicon Si: ≤0.70
Manganese Mn: ≤1.00
Phosphorus P: ≤0.03
Sulfur S: ≤0.01
Chromium Cr: 19.5 - 20.5
Molybdenum Mo: 6 - 7
Nickel Ni: 17.5-18.5
Copper cu: 0.5 - 1
Nitrogen N: 0.18 - 0.25
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