Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality ferritic stainless steel seamless pipe and tube and nickel-nickel alloys. The following introduces ferritic stainless steel.
Formability of ferritic stainless steel
The uses of ferritic stainless steel are so extensive, and the properties of ferritic stainless steel required for each use are different. However, the formability of ferritic stainless steel is worse than that of austenitic stainless steel such as 304 steel. Although the y value of ferritic stainless steel, that is, the deep drawability index, varies in a wider range from 1.0 to 2.0, the n value, that is, the ductility index is limited, about 0.2, which is higher than 0.4 to that of austenitic stainless steel. 0.65 is low. For drawn products, it is difficult to use ferritic stainless steel to replace austenitic stainless steel. If you want to replace it, you must change the design of the product and design it into a drawn shape.
Toughness of ferritic stainless steel
There have been many studies on the effect of titanium and niobium on the pressure formability, the focus is mainly on the average y value, and the conclusion is that the appropriate amount of these elements can effectively improve the pressure formability. However, excessive addition of these elements can also have harmful effects. For example, as the content of titanium and niobium increases, the transformation temperature of longitudinal cracks also increases. Even though ferritic stainless steel has a good average γ value, the ductile brittleness transition temperature may damage the deep drawability. Since the transformation temperature is one of the decisive factors for formability, deformation may be difficult to proceed at a higher transformation temperature.
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