Twenty-high rolling mill cold rolling method of iron-chromium-aluminum hot coil

Abstract

The invention discloses a twenty-high rolling mill cold rolling method of an iron-chromium-aluminum hot coil. The twenty-high rolling mill cold rolling method comprises the steps of preparing a material, specifically, selecting the iron-chromium-aluminum hot coil subjected to annealing and acid-washing with the thickness of 1.5-6.0 mm, the width of 200-2500 mm and the weight of more than 1 ton; heating and preserving heat, specifically, heating the iron-chromium-aluminum hot coil to 120-350 DEG C before rolling the iron-chromium-aluminum hot coil, and preserving heat for 1.5 hours or more; carrying out preparation before the rolling of a twenty-high rolling mill, specifically, controlling the cooling oil temperature of the twenty-high rolling mill at 30-220 DEG C, and reducing the coolingoil quantity to 1000-1500 L / min; and carrying out the twenty-high rolling mill cold rolling, specifically, hoisting the iron-chromium-aluminum hot coil subjected to heating and heat preservation to acoiler, finishing uncoiling, threading and feeding the iron-chromium-aluminum hot coil into the twenty-high rolling mill for rolling within 30 seconds, controlling rolling passes and the distributionof the rolling deformation rate of each pass of the twenty-high rolling mill according to the total deformation rate of 50%-85% and the thickness of a product after cold rolling being 0.5-1.8 mm, controlling the rolling speed of the first pass to be 100-250 m / min, and controlling the rolling deformation rate to be 12%-25%. According to the twenty-high rolling mill cold rolling method of the iron-chromium-aluminum hot coil, the rolling process is stable, and no strip breakage phenomenon exists.

Description

technical field [0001] The present invention generally relates to the technical field of iron-chromium-aluminum hot coil rolling, and more specifically relates to a 20-roller cold-rolling method for iron-aluminum-chromium hot coils, which is suitable for a thickness of 1.5mm to 6.0mm, a width of 200mm to 2500mm and a weight of More than 1 ton of annealed and pickled iron-chromium-aluminum hot coils are cold-rolled on a 20-high rolling mill. Background technique [0002] Iron-chromium-aluminum alloy is an electric heating alloy material with a ferrite structure. The main grades are GB / T 1234, ASTM B 603 or other standards for electric heating alloy iron-chromium-aluminum grades, such as 1Cr13Al4, 0Cr21Al5, 0Cr21Al6RE, 0Cr25Al5 and 0Cr27Al7Mo2 steel grades , Widely used in electric heating, environmental protection and other fields. [0003] Since the brittle-ductile transition temperature of iron-chromium-aluminum hot coils is above 30°C, under the current technical conditio...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems existing in the prior art, and to overcome the brittleness of iron-chromium-aluminum hot coils after annealing and pickling, so that they cannot be rolled according to the conventional stainless steel cold rolling process, the present invention provides a steel coil suitable for thicknesses from 1.5 mm to 6.0 mm. mm, width 200 mm to 2500 mm, and weight exceeding 1 ton, twenty-high mill cold rolling method of annealed and pickled iron-chromium-aluminum hot coils