S is a high-alloyed stainless steel, also known as 6% molybdenum super austenitic stainless steel. Its grade and chemical composition is one of the following:
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2. Ingredients: nickel (Ni) about 17.5-18.5%, chromium (Cr) about 19.5-20.5%, molybdenum (Mo) about 6-6.5%, copper (Cu) about 0.5-1%, nitrogen (N) about 0.18-0.22%, titanium (Ti) about 0.6-1%, iron (Fe) remainder.
The following are the production standards, forging, heat treatment, cold working, corrosion resistance, mechanical properties, performance and welding material grades of S, as well as some common application areas:
3. Heat treatment: S can be solution annealed in the range of - degrees Celsius and then cooled by rapid cooling (e.g. water quenching or air cooling) to obtain the best corrosion resistance.
4. Cold working: S has good cold working properties and can be processed by cold rolling and cold drawing.
5. Corrosion resistance: S has excellent corrosion resistance, especially for some strong acids, alkalis and chloride media with high corrosion resistance.
6. Mechanical properties: S has excellent strength and toughness, and can still maintain good mechanical properties at high temperature.
9. Application areas: S is widely used in offshore engineering, chemical industry, oil and gas processing, food processing, etc. It is especially suitable for equipment and piping systems in corrosive media environments.
10. Welding performance: S has good welding performance and can be welded by conventional welding methods, such as manual arc welding, argon arc welding, resistance welding and so on. When welding, the corresponding welding materials and welding process should be selected to ensure the quality and corrosion performance of the weld.
11. Other properties: S has good wear resistance, creep resistance, oxidation resistance and stress corrosion cracking resistance, which gives it excellent stability and reliability under extreme environmental conditions.
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12. Relevant standards: S complies with international standards such as ASTM (American Society for Testing and Materials) and EN (European Standard), such as ASTM A240, ASTM A312, ASTM A269, ASTM A479, EN 1. and so on.
13. Corrosion resistance: S has excellent corrosion resistance to many strong acids (e.g., sulfuric acid, hydrochloric acid, phosphoric acid), strong bases (e.g., sodium hydroxide), and chloride media (e.g., seawater, chloride solutions), and is therefore widely used in marine environments and chemical processes.
14. Product form of S: S stainless steel can be made into plate, tube, bar, weld material and other forms to meet the needs of different fields and applications.
15. Typical application areas: S is commonly used in the marine and petroleum industries in seawater treatment equipment, desalination units, petroleum refining equipment, pipelines and valves in chloride environments, chemical equipment, food processing equipment, and other fields, especially in the corrosion resistance requirements of high occasions.
UNS S is a high-end austenitic stainless steel, also referred to as stainless steel grade 254 or alloy 254 SMO. It has high levels of chromium, molybdenum and nitrogen, making it significantly stronger than other austenitic grades and providing many other benefits for a range of applications and industries.
Some of the standard applications that benefit from UNS S include the following:
If your applications require outstanding strength and strong resistance to pitting and crevice corrosion, UNS S is the ideal solution. Additional benefits include an enhanced level of ductility, good weldability and resistance to chemical and saltwater corrosion, especially in high chloride environments.
Masteel offers a wide range of steel products that can be used in many applications around the world. One of the key advantages of UNS S is the molybdenum enhances its resistance to corrosion, making it the perfect material for saltwater applications. It is also beneficial in fossil fuel power stations, and the nuclear and oil and gas industries because of its ductility and impact strength.
For more information on UNS S and the other steels we provide, click through to the relevant product pages via the links below.
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