Recently, Qingtuo 16mm thick 2205 stainless steel plate has successfully bent angle steel in Daming Jingjiang base. After 90 ° bending, the edge has no crack, and the bending yield reaches 100%. This processing of 2205 stainless steel corner groove is used to supply a major foreign project construction, which is another major breakthrough in the performance of Qingshan 2205 duplex stainless steel plate, ranking the leading level of domestic peers.

 

  Why is it difficult to bend 16mm 2205 duplex steel

 

  The main characteristics of 2205 duplex stainless steel are that the yield strength can reach 500-600mpa, which is twice of the ordinary stainless steel, which can save the material and reduce the equipment manufacturing cost. In terms of corrosion resistance, especially in the condition of bad medium environment (such as seawater, high chloride content), the pitting resistance, crevice corrosion, stress corrosion and corrosion fatigue performance of duplex stainless steel are obviously better than that of ordinary austenitic stainless steel, which can be compared with high alloy austenitic stainless steel.

 

  But the high strength, high hardness and low plasticity of duplex stainless steel make it more difficult to produce and process than ordinary stainless steel. The production of stainless steel double phase steel plate is difficult, the surface defect rate is high, and the grinding ratio is high, mainly by manual grinding. In the later stage of forming, it is difficult to process and form because its plasticity is only about 60% of ordinary austenite. Bending into angle groove, different from ordinary rolling circle, it needs to be bent into 90 °, and large deformation. After bending, it is easy to crack at the side with serious deformation. The larger the thickness of stainless steel, the more likely the 90 ° bending will produce edge crack.

 

  2205 stainless steel has reached the leading level in China

 

  The thickness bending of 2205 duplex stainless steel in domestic steel plant reached the same level, only a few enterprises can achieve the products, and the yield fluctuates greatly. The successful bending of angle steel for 16mm 2205 stainless steel plate indicates that the processing performance of double phase stainless steel plate has reached the leading level in domestic production.

 

  It is realized by Qingshan people to realize 2205 high strength, high hardness and plasticity as much as possible. This requires reasonable alloy element ratio from the angle of steelmaking, and in addition, to control reasonable solid solution process in the process of processing, and a series of strict enterprise production control to ensure the high quality of materials. Qingshan has been producing duplex stainless steel from 2017. For more than 3 years, the quality has been steadily improved from the two-phase stainless steel rolling plate to the medium and thick plate.