Method suitable for steckel mill to manufacture hot rolling steel strips of ferritic stainless steel

Abstract

The invention discloses a method suitable for a steckel mill to manufacture hot rolling steel strips of ferritic stainless steel, comprising the following steps: (1) smelting and continuous casting sheet billet according to conventional process; (2) hot rolling heating: a stepping heating furnace is adopted for heating the sheet billet, the heating area is divided to four sections which sequentially are a heat recovery section, a preheating section, a heating section and a uniform heating section, the pressure in a furnace cavity is micro positive pressure, and the atmosphere in the furnace is weak oxidizing atmosphere; (3) hot rolling: rolling pass of the rough rolling is 7, start rolling temperature is 1130 + / -10 DEG C, the draft of the first pass is no more than 15 percent, and the second pass is no more than 20 percent; and precision rolling adopts the steckel mill for rolling, the rolling pass of the precision rolling is 7, and load distribution rate of each pass of the precision rolling is adjusted so as to ensure that the draft of the sixth pass is no more than 20 percent and the draft of the last pass is larger than 10 percent and is less than 12 percent. The method can effectively solve the quality problem of edge crack of the hot rolling steel strips, and has strong operability and low manufacture cost.

Description

technical field [0001] The invention relates to a method applicable to the production of ferritic stainless steel hot-rolled steel strips by a coil mill, in particular to a production method for preventing edge crack defects from being produced by SUS410S ferritic stainless steel hot-rolling. Background technique [0002] Ferritic stainless steel has the advantages of low cost, high thermal conductivity, and small linear expansion coefficient. And the shortcomings of formability and other aspects have been significantly improved. It is precisely because ferritic stainless steel is more and more widely used, the currently widely used ferritic stainless steel product is SUS410S. SUS410S ferritic stainless steel has a serious problem of side cracks during the rolling process, mainly manifested in rough rolling cracks or finished roll end cracks. This defect reduces product quality and yield, increases production costs, and also affects the production and processing of the next...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned prior art, the present invention provides a method applicable to the production of ferritic stainless steel hot-rolled steel strip by a steckel mill, which solves the problem of edge cracking in the rolling process of the steel strip, and ensures the quality of the hot-rolled steel strip. The edge quality of the steel strip improves the width yield of the finished coil

Images