Serious cracking occurred in the rolling process of a batch of pipes made of S32750 super duplex stainless steel.The chemical composition,non-metallic inclusions,microstructure and mechanical properties of the pipe materials were analyzed by means of spectrograph,metallographic microscope,scanning electron microscope,tensile tester and impact tester,and combined with rolling process and hot extrusion process.The results show that there are a lot of σ-intermetallic phases with Fe-Cr-Mo segregation in the microstructure before rolling,which is brittle and leads to cracking of the rolled steel pipe.After solution treatment at 1100 ℃ for 60 min before rolling,the intermetallic phase σ is fully dissolved,the strength and hardness are reduced,while the plasticity and toughness are improved,which can solve the rolling cracking problem.
关键词
S32750超级双相不锈钢/轧制开裂/显微组织/固溶处理
Key words
S32750 super duplex stainless steel/rolling cracking/microstructure/solution treatment
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