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Hot-rolled enameled steel plate and preparation method thereof

A technology of steel plate and enamel, which is applied in the field of hot-rolled enamel steel plate and its preparation, can solve the problems of hot-rolled enamel steel, etc., and achieve the effects of good anti-scaling performance, good formability, and high elongation

Inactive Publication Date: 2017-06-13
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The highest yield strength grade of hot-rolled enamelled steel described in the current national standard is 360MPa, and there is no description of hot-rolled enamelled steel with a yield strength exceeding 500MPa

Method used

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  • Hot-rolled enameled steel plate and preparation method thereof
  • Hot-rolled enameled steel plate and preparation method thereof
  • Hot-rolled enameled steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A hot-rolled enamel steel plate, its chemical composition is shown in Table 3 by weight percentage, and its thickness is 7.5mm.

[0074] The above-mentioned preparation method of hot-rolled enamelled steel plate comprises the following steps:

[0075] Step 1, the molten iron is pretreated, converted into steel and refined to obtain molten iron with the composition ratio of the hot-rolled enamel steel plate; wherein, the chemical composition of the hot-rolled enamel steel plate is shown in Table 3 by weight percentage;

[0076] Among them, the KR desulfurization deep desulfurization technology is adopted, and after the KR desulfurization is completed, the S in the molten iron is ≤0.002%, so as to ensure that the S in the finally obtained enamelled steel is <0.005%.

[0077] Step 2, continuous casting:

[0078] The refined molten iron is subjected to continuous casting to obtain cast slabs; wherein, the casting speed of the continuous casting process is 1m / min.

[0079]...

Embodiment 2

[0094] A hot-rolled enamel steel plate, its chemical composition is shown in Table 3 by weight percentage, and its thickness is 7.5mm.

[0095] The above-mentioned preparation method of hot-rolled enamelled steel plate comprises the following steps:

[0096] Step 1, the molten iron is pretreated, converted into steel and refined to obtain molten iron with the composition ratio of the hot-rolled enamel steel plate; wherein, the chemical composition of the hot-rolled enamel steel plate is shown in Table 3 by weight percentage;

[0097] Among them, the KR desulfurization deep desulfurization technology is adopted. After the KR desulfurization is completed, the S in the molten iron is ≤0.002%, so as to ensure that the S in the final enamelled steel is <0.005%;

[0098] Step 2, continuous casting:

[0099] The refined molten iron is subjected to continuous casting to obtain cast slabs; wherein, the casting speed of the continuous casting process is 1m / min.

[0100] Step 3, heatin...

Embodiment 3

[0114] A hot-rolled enamel steel plate, its chemical composition is shown in Table 3 by weight percentage, and its thickness is 8mm.

[0115] The above-mentioned preparation method of hot-rolled enamelled steel plate comprises the following steps:

[0116] Step 1, the molten iron is pretreated, converted into steel and refined to obtain molten iron with the composition ratio of the hot-rolled enamel steel plate; wherein, the chemical composition of the hot-rolled enamel steel plate is shown in Table 3 by weight percentage;

[0117] Among them, the KR desulfurization deep desulfurization technology is adopted, and after the KR desulfurization is completed, the S in the molten iron is ≤0.002%, so as to ensure that the S in the finally obtained enamelled steel is <0.005%.

[0118] Step 2, continuous casting:

[0119] The refined molten iron is continuously cast to obtain a cast slab; wherein, the casting speed of the continuous casting process is 1.1m / min.

[0120] Step 3, heat...

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Abstract

The invention discloses a hot-rolled enameled steel plate and a preparation method thereof. The hot-rolled enameled steel plate comprises, by weight, 0.061%-0.089% of C, 0.11%-0.20% of Si, 0.60%-0.70% of Mn, 0-0.015% of P, 0-0.005% of S, 0.020%-0.050% of Alt, 0.1%-0.2% of Ti, 0-0.006% of N, and the balance Fe and inevitable impurities. According to the mass ratio, the ratio of the Ti to the C is 1.1-3.3. The method includes the steps that (1) molten iron is subjected to pretreatment, converter steelmaking and refining to obtain casting blank molten iron; (2) the molten iron is subjected to continuous casting, and accordingly a casting blank is made; (3) the casting blank is heated and the tapping temperature is controlled; (4) multi-pass rough rolling and finish rolling are carried out, so that a finish-rolled plate is obtained; and (5) reeling is performed at a certain temperature after laminar cooling, and a finished product can be obtained. According to the steel plate prepared through the method, the yield strength is 550-620MPa, the tensile strength is 630-730MPa, and the elongation at break is 22%-30%. According to the hot-rolled enameled steel plate after application of enamel, the yield strength is 350-410MPa, the tensile strength is 430-530MPa, the elongation at break is 33.5%-37%, and the enamel adhesive force reaches level A.

Description

technical field [0001] The invention relates to the technical field of hot-rolled enamel steel, in particular to a hot-rolled enamel steel plate with high strength and high elongation after enamelling and a preparation method thereof. Background technique [0002] Nowadays, some large-scale water treatment facilities, chemical facilities, and environmental protection facilities are assembled and manufactured with enamelled steel structures. These fields require hot-rolled steel plates with high strength and allowing double-sided enamelling. The performance requirements of hot-rolled enamel steel sheets are closely related to their processing technology, mainly including strength, formability, scale resistance, adhesion, etc. Different uses require different comprehensive properties to suit. According to the strength of the hot-rolled sheet, it can be divided into different yield strength levels, such as from 210MPa, 245MPa to 330MPa, etc. [0003] The highest yield strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C33/04C21D8/00
CPCC21D8/00C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 黄学启刘相华赵阳张志敏刘再旺李晓林邵肖静
Owner NORTHEASTERN UNIV
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