Tag: Duplex stainless steel

Requirements and restrictions for the use of duplex stainless steel

Duplex stainless steel has been continuously developed and improved over the years, and some fields have replaced austenitic stainless steel. In recent years, the use of super duplex stainless steel has also created favorable conditions for expanding the use of duplex stainless steel and developing new steel grades. Duplex stainless steel not only has the commonality […]

2205 welding process considerations

1 The second-generation duplex stainless steel is generally called standard duplex stainless steel. Its composition is ultra-low carbon and nitrogen. Its typical composition is 22% cr + 5% ni + 0.17% n, compared with the first generation duplex stainless steel. 2205 further increases the nitrogen content and enhances the stress corrosion resistance and pitting resistance in an […]

Development and application of duplex stainless steel

Duplex stainless steel has two kinds of metal phase structure, so the duplex stainless steel can combine the properties of ferritic stainless steel and austenitic stainless steel by properly controlling the chemical composition and heat treatment process, that is, the good toughness and welding of austenitic stainless steel. Performance combined with higher strength and chloride stress […]

Properties and classification of duplex stainless steel

The biphase in the name of the duplex stainless steel is mainly derived from the microstructure of the alloy. The duplex stainless steel usually contains about 50/50 austenite and delta ferrite phase mixture. Compared to austenitic stainless steel (for example, 304 or 316 stainless steel), duplex stainless steel has better corrosion resistance, especially chloride stress corrosion and […]

Barriers to the use of duplex stainless steel

The attractive combination of high strength, extensive corrosion resistance and moderate weldability seems to provide great potential for increasing the market share of duplex stainless steel. However, it is necessary to understand the limitations before using duplex stainless steel. The advantages of high strength can also be a drawback when considering formability and workability. High strength […]

A simple guide to duplex stainless steel

Duplex stainless steel is becoming more and more common. They can be produced in all major steel mills. The reasons for its general application are as follows: higher strength leads to weight saving, stronger corrosion resistance, especially stress corrosion cracking, high price stability and relatively cheap price. However, even with these advantages, the market share of […]

Development history of duplex stainless steel

Early development of duplex stainless steel: Duplex stainless steel, which combines many beneficial properties of ferritic and austenitic stainless steels, was originally developed in the early 1930s. The initial duplex stainless steel provides good performance characteristics but has limitations under welding conditions. The metallurgical process at the time was not suitable for producing grades with the […]

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