Production method of cold-rolled steel strip for flux cored wire

Abstract

The invention provides a production method of a cold-rolled steel strip for a flux cored wire. The production method comprises the following steps of: (1) selecting a raw material, to be specific, selecting an SPCE hot-rolled acid-washed raw material with thickness of 2.2-3.0 mm and width of 300-850 mm, wherein the raw material comprises the following components in percentage by weight: 0.01-0.025 percent of C, 0.002-0.010 percent of Si, 0.150-0.350 percent of Mn, not greater than 0.01 percent of S, not greater than 0.015 percent of P, not greater than 0.003 percent of N, not greater than 0.05 percent of Alt and the balance of iron element and inevitable impurities; (2) cold-rolling, to be specific, performing cold-rolling on the acid-washed raw material to be 0.5-1.2 mm and controlling total screw-down rate to be 700-85 percent; (3) performing recrystallization annealing, to be specific, holding a rolled steel strip in a forced circulation hood type annealing furnace, heating, preserving heat and cooling, wherein the holding temperature is 610-660 DEG C and the holding time is controlled to be 9-12 hours; (4) leveling; and (5) cutting to obtain the cold-rolled steel strip for the flux cored wire. The produced flux cored wire steel strip has a simple production process and is low in cost. The produced flux cored wire steel strip has stable performance; solid solution carbide is fully separated through staged slow cooling in the process of the hood type annealing furnace; the influence of time limitation on subsequent drawing is avoided; the hardness of the product is HV 90-110; and the extensibility A reaches 42-50 percent.

Description

technical field [0001] The invention relates to the field of production and manufacture of cold-rolled precision steel strips, in particular to a method for producing cold-rolled steel strips for flux-cored welding wires. Background technique [0002] Flux-cored welding wire is an environmentally friendly welding material. Its welding efficiency is 3-4 times that of ordinary welding rods, and it can save energy by 20-30%. It has the characteristics of high quality, high efficiency, and low cost. Fast and widely used high-tech products. Flux-cored wire manufacturing materials are mainly composed of cold-rolled steel strip and filled flux core, of which the mass of cold-rolled steel strip accounts for 80-85% of the total mass of flux-cored wire. [0003] The finished products of cold-rolled steel strip for flux-cored welding wire are mainly cold-rolled steel strips with a thickness of 0.5-1.2mm and a width of 10-18mm, which have high requirements for the tensile properties, s...

AI Technical Summary

Problems solved by technology

However, there are often problems such as cumbersome process flow, high cost, uneven performance of the steel strip, and difficult control of surface roughness.

Specifically, in the existing flux-cored wire cold-rolled steel strip production process, the degreasing process is used to remove surface oil after the raw material is rolled. The annealing temperature is generally 650-740°C, which is relatively high. The specific cold rolling process (rolling, recrystallization annealing, smoothing, surface roughening, etc.) is rarely involved (patent 201010598203.7 mainly involves the flux cored hot rolling process, and patent 201110106920.8 mainly involves the preparation of downstream flux cored wire, not steel with manufacturing process)