Method for compensating finish rolling gap during mixed stainless steel rolling

Abstract

The invention provides a method for compensating a finish rolling gap during mixed stainless steel rolling. The method comprises the following steps of 1 determining a chemical component factor alpha of steel to be subjected to finish rolling and a chemical component factor alpha of a piece of previous finish rolling steel, and then determining a steel type compensation factor coff_alpha according to an alpha-alpha absolute value, wherein the steel type compensation factor coff_alpha is 0-0.6; 2 calculating a rolling gap compensation factor ksk_alpha according to the following formula ksk_alpha=(alpha-alpha1)*coff_alpha; 3 determining a bounce valve DH(I) of each finish rolling machine frame according to a stiffness curve during zeroing, wherein the I represents a number of a finishing mill frame; 4 determining a zero rolling gap S0(I) after zeroing, wherein the I represents the number of the finishing mill frame; 5 determining a rolling gap modification value KSK(I), wherein the I represents the number of the finishing mill frame; 6 determining a rolling gap value S(I) of each finishing mill according to the following formula S(I)=THEN(I+1)-DH(I)+S0(I)+KSK(I)+ksk_alpha, wherein the THEN(I+1) represents the outlet thickness of the I machine frame. By means of the method, specification change limitation of a hot continuous rolling product is effectively extended.

Description

technical field [0001] The invention relates to a rolling method of hot continuous rolling products, in particular to a rolling method of hot continuous rolling products with accurate thickness, pressure and roll gap. Background technique [0002] The hot continuous rolling process is a method of producing steel products, usually using continuous casting slabs or blooming slabs as raw materials. The slab is first heated in the heating furnace according to the temperature specified by the process, and heated to the target temperature. Then the slab is descaled by high-pressure water, and then enters the roughing mill, usually with vertical rolls to control the width and flat rolls to control the thickness. After being rolled by the rough rolling unit, the strip steel reaches the preset target thickness, width and temperature, and then the strip steel enters the finishing rolling unit for continuous rolling, so that the strip steel reaches the preset target thickness and temp...

AI Technical Summary

Problems solved by technology

[0004] The aging of equipment in the hot rolling production line will lead to a decrease in the accuracy of the equipment. The main performance is that the finishing unit performs zero adjustment after each roll change. Leading to the occurrence of waste products, that is, the first piece of steel rolling after zero adjustment cannot meet the product accuracy requirements

[0005] In addition, market competition has led to continuous changes in the product structure of hot rolling. Frequent switching of large spans occurs between soft steel and hard steel, thin-gauge strip steel and thick-gauge strip steel. When switching, the first piece of steel Can not meet the requirements of product accuracy

[0006] Moreover, when stainless steel and carbon steel are rolled together (every two pieces of carbon steel are rolled, one piece of stainless steel is rolled, and the rolling unit has been scheduled for rolling according to this rule), neither stainless steel nor carbon steel can meet the requirements of the product. Accuracy requirements

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