A production method of ultra-high-strength bright strapping

Abstract

A production method of an ultrahigh-strength bright binding strap comprises the steps that a 20Mn2 hot rolling acid pickling coil is adopted as a raw material for cold rolling; high-temperature austenitizing is carried out after uncoiling, splitting and deburring; a C18H29SO3Na+tween 40 aqueous solution is adopted for quenching; tempering is carried out under the nitrogen and hydrogen mixing protective atmosphere after conventional washing; and air cooling is carried out to room temperature, and coiling is carried out. The thickness of a product is 0.8-1.0mm, the tensile strength of the product is 1,080-1,130 MPa, the ductility of the product is 11.0-13.0%, and in addition, the surface roughness of the product is 0.40-0.60 micron, the specular reflectance of the product is 85-90%, and compared with the price of galvanized steel sheets, the ton steel cost is reduced to at least 300 yuan. The product performance can completely meet the need for bundling packaging of large-coil-weight high-quality cold-rolled automobile sheets.

Description

technical field [0001] The invention relates to a production method of a strap, in particular to a production method of an ultra-high-strength bright strap. Background technique [0002] The straps used for bundling and packaging of high-quality cold-rolled automobile sheets with large coil weights should generally have the following three conditions, namely: first, high strength to prevent the tape from being broken due to low strength; second, appropriate roughness, It is necessary to prevent the steel strip from slipping and not being tightly bound due to too low roughness, and to prevent the surface of the automobile sheet from being damaged due to excessive roughness; the third is higher brightness to match the metallic luster of cold-rolled automobile sheets and improve the overall packaging Effect. [0003] At present, the common blued or painted straps on the market are not suitable for strapping high-quality cold-rolled automotive sheets due to their high roughness...

AI Technical Summary

Problems solved by technology

However, this process also has a disadvantage: the cooling ability of molten nitrate is weak, it takes a long time to cool to the required temperature, and the corresponding microstructure transformation occurs, and it is easy to make the steel with low stability of supercooled austenite Pearlite forms during cooling

However, there are shortcomings in this process: the cooling ability of molten nitrate is weak, it takes a long time to cool to the required temperature and the corresponding microstructure transformation occurs, and it is easy to make the steel with less stable austenite in the cooling process pearlite

In addition, due to the long cooling time, production often needs to be carried out at a slow speed, which will lead to low work efficiency and increased production costs

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