What is the difference between super stainless steel and nickel-based alloy?

May 24 2023

Super stainless steel and nickel-based alloys are special stainless steel. First of all, they are different from ordinary stainless steel in chemical composition. They refer to a high alloy stainless steel containing high nickel, high chromium, and high molybdenum. Among them, the more famous one is 6%Mo steel (254SMo).

This type of steel has very good local corrosion resistance. It has good pitting corrosion resistance under seawater, aeration, gaps, and low-speed erosion (PI≥ 40) and better resistance to stress corrosion, is a substitute for Ni-based alloys and titanium alloys. Secondly, in terms of high temperature or corrosion resistance, it has a more excellent high temperature or corrosion resistance, and it is irreplaceable for 304 stainless steel.

In addition, from the classification of stainless steel, the metallographic structure of special stainless steel is stable austenite metallographic structure.

Because 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 pouring, forging, calendaring, and so on.


In many fields, such as:

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: atomic power generation, comprehensive utilization of coal, sea tide power generation, etc.

4. Petrochemical industry: oil refining, chemical and chemical equipment, etc.

5. Food field: salt making, soy sauce brewing, etc.

In the above many fields, ordinary stainless steel 304 is incapable. In these special fields, special stainless steel is indispensable and irreplaceable. In recent years, with the rapid economic development and the continuous improvement of the level of the industrial field, more and more projects require higher grade stainless steel-special stainless steel (super stainless steel, nickel-based alloy).





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