CN105177458A - Manufacturing method of cold-rolled steel plate - Google Patents

Abstract

The invention discloses a manufacturing method of a cold-rolled steel plate. The cold-rolled steel plate has the following components in percentage by mass: 0.10-0.20 of C, Mn more than 0.2, Ni more than 0.01, 0.6-2.6 of Mn+Ni, 1.5-9.0% of Cr, and the balance of iron and inevitable impurities. The manufacturing method of the cold-rolled steel plate can provide a thickness requested by a raw material of a liquid crystal frame or a frame part of a sealing gasket, a notebook computer, a mobile phone and a digital camera for a vehicle gasoline engine.

Description

A kind of manufacture method of cold-rolled steel sheet

Technical field

The present invention relates to a kind of manufacture method of cold-rolled steel sheet.

Background technology

Large mainly with coldmoulding for the liquid crystal frame parts of mobile telephone and notebook computer etc. and motor car engine gasket etc., therefore, the cold-rolled steel sheet of the thin plate used requires compression moulding.

In addition, in the parts such as electronic unit and motor car engine gasket being representative with notebook computer and mobile telephone, digital camera, also lightweight and miniaturization is required, in order to by these parts lightweights, miniaturization, need steel plate thinning, in addition, because identical intensity can not guarantee the intensity as pressed part, therefore, need to provide a kind of thin size and the high tensile steel plate with high strength.

Summary of the invention

The object of this invention is to provide a kind of manufacture method of cold-rolled steel sheet.

The technical solution used in the present invention is: a kind of manufacture method of cold-rolled steel sheet, hot-rolled steel sheet comprises following composition in mass %: C:0.10 ~ 0.20, more than Mn:0.2, more than Ni:0.01, Mn+Ni:0.6 ~ 2.6, Cr:1.5 ~ 9.0, and remainder is iron and inevitable impurity;

Step is as follows:

(1), after hot-rolled steel sheet carries out pickling, the rate of being rolled add up to more than 60% cold rolling, make cold-rolled steel sheet;

(2), by soaking temperature be set as more than 750 DEG C, speed of cooling is set as 10 DEG C/s ~ 100 DEG C/s, carries out continuous annealing process;

(3), in continuous annealing process, the soaking carrying out more than 1s below 100s with soaking temperature more than 750 DEG C keeps, and makes that tensile strength is more than 1280MPa, elongation at break is more than 3%, thickness is the cold-rolled steel sheet of 0.05 ~ 0.60mm.

The invention has the beneficial effects as follows: this technique can provide a kind of load when alleviating cold rolling, high strength and ensure that the cold-rolled steel sheet of the compression moulding excellence of ductility.

Embodiment

Embodiment 1:

A manufacture method for cold-rolled steel sheet, hot-rolled steel sheet comprises following composition in mass %: C:0.10, Mn:0.2, Ni:0.01, Mn+Ni:2.6, Cr:9.0, and remainder is iron and inevitable impurity;

Step is as follows:

(1), after hot-rolled steel sheet carries out pickling, the rate of being rolled add up to more than 60% cold rolling, make cold-rolled steel sheet;

(2), by soaking temperature be set as more than 750 DEG C, speed of cooling is set as 10 DEG C/s ~ 100 DEG C/s, carries out continuous annealing process;

(3), in continuous annealing process, the soaking carrying out more than 1s below 100s with soaking temperature more than 750 DEG C keeps, and makes that tensile strength is more than 1280MPa, elongation at break is more than 3%, thickness is the cold-rolled steel sheet of 0.05 ~ 0.60mm.

Embodiment 2:

A manufacture method for cold-rolled steel sheet, hot-rolled steel sheet comprises following composition in mass %: C:0.10, Mn:0.5, Ni:0.06, Mn+Ni:1.5, Cr:2.5, and remainder is iron and inevitable impurity;

Step is as follows:

(1), after hot-rolled steel sheet carries out pickling, the rate of being rolled add up to more than 60% cold rolling, make cold-rolled steel sheet;

(2), by soaking temperature be set as more than 750 DEG C, speed of cooling is set as 10 DEG C/s ~ 100 DEG C/s, carries out continuous annealing process;

(3), in continuous annealing process, the soaking carrying out more than 1s below 100s with soaking temperature more than 750 DEG C keeps, and makes that tensile strength is more than 1280MPa, elongation at break is more than 3%, thickness is the cold-rolled steel sheet of 0.05 ~ 0.60mm.

Above embodiments of the present invention are described, but the invention is not restricted to above-mentioned embodiment, in the ken that art those of ordinary skill possesses, can also make a variety of changes under the prerequisite not departing from present inventive concept.

Claims (1)

1. the manufacture method of a cold-rolled steel sheet, it is characterized in that: hot-rolled steel sheet comprises following composition in mass %: C:0.10 ~ 0.20, more than Mn:0.2, more than Ni:0.01, Mn+Ni:0.6 ~ 2.6, Cr:1.5 ~ 9.0, remainder is iron and inevitable impurity;

Step is as follows:

(1), after hot-rolled steel sheet carries out pickling, the rate of being rolled add up to more than 60% cold rolling, make cold-rolled steel sheet;

(2), by soaking temperature be set as more than 750 DEG C, speed of cooling is set as 10 DEG C/s ~ 100 DEG C/s, carries out continuous annealing process;

(3), in continuous annealing process, the soaking carrying out more than 1s below 100s with soaking temperature more than 750 DEG C keeps, and makes that tensile strength is more than 1280MPa, elongation at break is more than 3%, thickness is the cold-rolled steel sheet of 0.05 ~ 0.60mm.