Stainless cold-rolling strip steel and manufacturing method thereof

Abstract

The invention relates to a stainless cold-rolling strip steel containing the following components in percentage by weight: not more than 0.02 wt% of C, 0.3 to 0.80 wt% of Si, 0.2 to 0.80 wt% of Mn, not more than 0.040 wt% of P, not more than 0.15 wt% of S, 16.5 to 19.5 wt% of Cr, not more than 0.02 wt% of N, 0.2 to 0.6 wt% of Nb, 0.005 to 0.08 wt% of Al and the balance of Fe and inevitable impurities. The manufacturing method of the stainless cold-rolling strip steel comprises the following steps of: continuously casting the components into a plate blank after smelting, wherein the electromagnetic stirring is adopted in the continuous casting process so that the isometric crystal ratio of the section of the plate blank reaches above 40%; hot rolling: the plate blank is heated to 950 to 1200 DEG C, rolled into strip steel for multiple times and then coiled into a steel roll, wherein the final rolling temperature is 750 to 900 DEG C, the coiling temperature is 350 to 700 DEG C, and then the steel roll is air-cooled into the room temperature; cold rolling: the hot-rolled steel roll is firstly acid-washed, wherein the annealing temperature is 800 to 1000 DEG C, and the annealing time is 0.5 to 5.0 min; rolling for multiple times by cold rolling, wherein the overall reduction is 60% to 75%; and finally annealing the cold-rolled strip steel by acid washing, wherein the annealing temperature is 800 to 1,050 DEG C, and the annealing time is 0.5 to 3 min; and cooling the steel roll below 550 DEG C so that the high-strength strip steel is obtained.

Description

technical field [0001] The invention relates to a stainless steel cold-rolled steel strip and a manufacturing method thereof, in particular to a high-strength niobium-containing stainless cold-rolled steel strip and a manufacturing method thereof. Background technique [0002] At present, the microstructure of Cr17 type ferritic stainless strip steel produced at home and abroad is mainly ferrite, and a small amount of trace alloying elements such as titanium and niobium are added to improve the corrosion resistance and strength of the steel, and some steel types also add molybdenum. , due to the rising price of molybdenum in recent years, the addition of molybdenum will significantly increase the cost of steel. [0003] Table 1 is the standard composition of the same type of ferritic stainless steel in the world, and Table 2 is the mechanical properties of the five grades of steel in 1. [0004] Table 1 [0005] Country Grade C Si mn P S Cr Ti N ...

AI Technical Summary

Problems solved by technology

[0002] At present, the microstructure of Cr17 type ferritic stainless strip steel produced at home and abroad is mainly ferrite, and a small amount of trace alloying elements such as titanium and niobium are added to improve the corrosion resistance and strength of the steel, and some steel types also add molybdenum. , due to the rising price of molybdenum in recent years, the addition of molybdenum will significantly increase the cost of steel