Alloy 2304 (UNS S32304) is a molybdenum-free duplex stainless steel composed of 23% chromium, 4% nickel.

2304 stainless steel (Chinese grade: 00Cr23Ni4N) is a low-alloy duplex stainless steel developed in Sweden. Its solution treatment temperature is about 1000 ℃, and its structure is 40%-50% ferrite and 50%-60% austenite. , has the common characteristics of duplex stainless steel, and is developed as a steel with high strength and low price, which can replace the commonly used austenitic stainless steels of 304L and 316L.

It has been approved by the American Society of Mechanical Engineers (ASME) for use in piping for boilers and pressure vessels, chemical plants and refineries, and has been incorporated into standards in many countries. The American standard is UNS S32304, and the Swedish commercial grade is SAF 2304.

The corrosion resistance properties of alloy 2304 are similar to those of 316L.

In addition, its mechanical properties, namely yield strength, are twice that of the 304L/316L austenitic grades. This feature enables designers to reduce product weight when designing products, especially pressure vessels.

SAF 2304 stainless steel has good mechanical and physical properties, resistance to stress corrosion and other forms of corrosion, and good weldability, making it possible to replace austenitic stainless steels such as 304, 304L, 316, and 316L. It can be used in the manufacture of amine recovery equipment, hydrocarbon fermentation equipment, etc. In addition, it can also be used as heat exchangers in the manufacturing industry, digester preheaters in the pulp and paper industry, and train seat frames in wet heat and offshore areas.

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