Because the two-phase structure of duplex stainless steel pipe has different hardness at high temperature and different softening mechanisms during hot deformation, it has unbalanced stress and strain distribution in austenite and ferrite. The cracks nucleate and propagate at the phase boundary of duplex stainless steel.

The thermoplasticity of duplex stainless steel is not only closely related to the steel grade, but also affected by factors such as strain rate, deformation temperature, and austenite phase morphology. In recent years, thermoplasticity has always been one of the research hotspots of duplex stainless steelworkers in China.

The thermal stretching method is used to study the thermoplasticity of several typical duplex stainless sheets of steel (2101, 2205, 2507) at the deformation temperature of 950~1200℃. As the deformation temperature increases, the tensile strength of duplex stainless steel gradually decreases. At the same deformation temperature, the increase in alloy content significantly improves the tensile strength of the steel. At the same time, as the deformation temperature increases, the duplex stainless steel The reduction of area of ​​stainless steel has gradually increased and maintained at a relatively high level between 1100 and 1200°C.

At the same deformation temperature, the reduction of area of ​​2507 is significantly lower than that of 2101 and 2205. Although the content of Cr and Mo of 2205 is higher than that of 2101, the composition of 2101 contains about 5% of Mn. Therefore, the reduction of areas of ​​2101 and 2205 Basically close.

Generally speaking, duplex stainless steel, has good thermoplasticity between 1100 and 1200℃. The research result is that the reasonable heat deformation temperature range is determined according to the heat deformation method, processing steel type and specifications during the actual production process. Foundation.

On this basis, Chinese metallurgical enterprises have effectively reduced the oxygen content in steel to less than 30ppm through optimization of the smelting process, and combined with low sulfur, rare earth and boron elements, etc., a good foundation has been laid for the hot processing of duplex stainless steel.

As a seamless steel seamless pipe manufacturer, Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is committed to producing Duplex Stainless Steel Pipe. If you are interested in our seamless pipes, please contact us.