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A kind of high-strength hot-rolled steel and its preparation method and application

A hot-rolled steel, high-strength technology, applied in transportation and packaging, upper structure, upper structure sub-assembly, etc., can solve the problem of high production cost, and achieve the effect of low alloy cost, simple process control and stable mechanical properties

Active Publication Date: 2017-06-23
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thin slab continuous casting and rolling process is adopted, and the steel contains expensive alloy elements such as Cu, Cr, Ni, etc., and the production cost is relatively high

Method used

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  • A kind of high-strength hot-rolled steel and its preparation method and application
  • A kind of high-strength hot-rolled steel and its preparation method and application
  • A kind of high-strength hot-rolled steel and its preparation method and application

Examples

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preparation example Construction

[0032] A method for preparing high-strength hot-rolled steel. The general steps of the production process are: molten iron pretreatment→converter→external refining→casting slab→heating→high-pressure water descaling→rough rolling→finish rolling→cooling→coiling.

[0033] Among them, specifically include the following steps:

[0034] a. After conventional molten iron desulfurization, converter smelting and LF furnace refining, the composition of molten steel is guaranteed to be: C 0.05%-0.10%, Mn 1.30%-1.60%, V 0.06-0.09%, Si≤0.30%, P ≤0.020%, S≤0.010%, the balance is Fe and unavoidable impurities;

[0035] b. The molten steel after the above treatment is rolled into a continuous casting slab with a thickness of 200-230 mm, soaked at 1180 ° C to 1240 ° C for a soaking time of ≥ 180 min, and then dephosphorized by high-pressure water;

[0036]c. The slab after the dephosphorization by high-pressure water in step b is first rough rolled in 3 to 7 passes, and rolled into an interme...

Embodiment 1

[0044] 1. Preparation of high-strength hot-rolled steel plates

[0045] a. After conventional molten iron desulfurization, converter smelting and LF furnace refining, the composition of molten steel is guaranteed to be: C 0.05% ~ 0.10%, Mn 1.30% ~ 1.60%, V 0.06 ~ 0.09%, Si ≤ 0.30%, P ≤0.020%, S≤0.010%, the balance is Fe and unavoidable impurities. See Table 1 for the chemical composition of molten steel numbered 1 to 5 in Example 1 of the present invention.

[0046] Chemical composition of steel in table 1 embodiment 1

[0047]

[0048]

[0049] b. The molten steel after the above treatment is further rolled into a continuous casting slab, and the continuous casting slab is sequentially subjected to slab heating, high-pressure water descaling, rough rolling, finish rolling, laminar cooling and coiling, so as to obtain Hot rolled steel plate. Among them, the heating temperature of the slab, the thickness of the intermediate slab, the finish rolling temperature, the air...

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Abstract

The invention belongs to the technical field of production of hot continuously-rolled strips and particularly relates to a hot rolled steel plate for an automobile compartment having the strength being greater than or equal to 600MPa and a manufacturing method of the hot rolled steel plate. The high-strength hot rolled steel plate comprises the following chemical components in percentage by weight: 0.05-0.10 percent of C, 1.30-1.60 percent of Mn, 0.06-0.09 percent of V, less than or equal to 0.30 percent of Si, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S and the balance of Fe and inevitable impurities. The hot rolled steel plate for the automobile compartment is produced by adopting a manganese and vanadium alloying manner; the yield strength of the hot rolled steel plate reach over 600MPa, the tensile strength of the hot rolled steel plate reaches over 650MPa, and the ductility of the hot rolled steel plate reaches over 15 percent; the high-strength hot rolled steel plate has the characteristics of high strength, stable mechanical property, favorable toughness matching and excellent molding property; the mechanical property of the hot rolled steel plate can meet the requirement of light weight of an automobile.

Description

technical field [0001] The invention belongs to the technical field of continuous hot-rolled strip production, and in particular relates to a hot-rolled steel plate for automobile compartments with a strength ≥ 600 MPa and a preparation method thereof. Background technique [0002] At present, in automobile production, ordinary low-carbon steel plates are used most. Low-carbon steel plate has good plastic processing performance, strength and rigidity can meet the requirements of automobile body, and can meet the requirements of tailor-welded body, so it is widely used in automobile body. Under the current level of manufacturing technology and technology, body weight reduction is an important means to solve overloading of heavy-duty vehicles and energy saving and emission reduction. Using high-strength steel, by reducing the thickness of the steel plate and reducing the weight of the car body, the service life of the product can be improved under the premise of reducing the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/02B62D25/00
Inventor 叶晓瑜张开华李卫平刘勇王羿熊雪刚黄徐晶
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP