On-line Solution Heat Treatment Process for Austenitic Stainless Steel Plates

An on-line solution heat treatment process for austenitic stainless steel plates, comprising the following steps:

• step 1, heating stainless steel continuous casting billets to 1200-1250° C. in a heating furnace, and preserving heat for 2-3 h to fully dissolve alloying elements and carbides;
• step 2, heating and preserving heat for the austenitized continuous casting billets, performing high pressure water dephosphorization after tapping to remove the surface iron scale, and then using a rolling mill to conduct multi-pass rolling to reach the target thickness required for a finished product;
• step 3, fully softening the steel plates which are work-hardened after rolling deformation;
• when heating and heat preservation conditions are available, heating the rolled steel plates to the solid solution temperature and preserving heat for 10-100 s;
• and when heating and heat preservation conditions are not available, selecting thin-gauge continuous casting billets with the thickness of ≤220 mm as raw materials in step 1, reducing rolling passes, ensuring that the finishing rolling temperature is above 1050° C., and swinging steel for 10-200 s after rolling;
• step 4, putting the stainless steel plates softened in step 3 in a cooling zone for ultra fast cooling to make the stainless steel plates quickly pass the temperature range of high chromium carbide precipitation;
• step 5, putting the cooled steel plates with shape defect of strips such as warpage in a straightener for straightening;
• step 6, cutting the cooled and straightened steel plates to length according to the finished size requirements, and then transporting to a cooling bed for cooling;
• step 7, putting the steel plates cooled to the room temperature in a shot blasting machine for shot blasting, and then putting in a pickling tank for pickling to remove the surface iron scale and impurities.