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A hot-rolled dual-phase steel and a method for manufacturing the hot-rolled dual-phase steel flat coil

A technology of hot-rolled dual-phase steel and a manufacturing method, which is applied in metal rolling, manufacturing tools, metal rolling, etc., to achieve excellent comprehensive mechanical properties, improve the problem of flat coils, and reduce the effect of not being able to be uncoiled on the machine

Active Publication Date: 2018-02-13
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of this method is to improve the problem of flat coils of hot-rolled dual-phase steel, and reduce the uncoiling caused by flat coils during production, resulting in unusable steel coils and unnecessary economic losses.

Method used

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  • A hot-rolled dual-phase steel and a method for manufacturing the hot-rolled dual-phase steel flat coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A hot-rolled dual-phase steel, composed of ferrite (F) and martensite, the mass percent of its chemical composition is: C: 0.07%, Mn: 1.64%, Si: 0.42%, P: 0.013%, S : 0.003%, Als: 0.029%, Nb: 0.021%, and the balance is iron and unavoidable impurities.

[0029] A method for preventing the hot-rolled dual-phase steel flat coil, comprising the steps of:

[0030] Hot metal pretreatment→converter smelting→furnace refining (LF)→wide slab continuous casting (CC)→2300mm unit hot continuous rolling (controlled rolling and controlled cooling)→coiling→inspection→packing for delivery;

[0031] The hot rolling process steps of the 2300mm unit include:

[0032] (1) The steel billet is heated to 1220°C by a regenerative heating furnace, and the time in the furnace is 165min, and a heat preservation cover is used;

[0033] (2) carrying out high-pressure water coarse dephosphorization to the steel billet after described step (1) heating;

[0034] (3) Carry out the width reduction of ...

Embodiment 2

[0042] A hot-rolled dual-phase steel, composed of ferrite (F) and martensite, the mass percent of its chemical composition is: C: 0.09%, Mn: 1.66%, Si: 0.42%, P: 0.012%, S : 0.004%, Als: 0.022%, Nb: 0.023%, and the balance is iron and unavoidable impurities.

[0043] A method for preventing the hot-rolled dual-phase steel flat coil, comprising the steps of:

[0044] The difference from Example 1 is:

[0045] In the step (1), the steel billet is heated to 1260°C through a regenerative heating furnace, and the time in the furnace is 240min, and a heat preservation cover is used;

[0046] The starting temperature of the rough rolling unit in the step (4) is 1180° C.;

[0047] In the step (9), after the steel strip leaves the finishing mill, the first group of laminar water cooling is turned on, and after cooling to 685°C, air cooling is carried out for 7-9s, and then the second stage of laminar cooling water is turned on to cool to 530°C for coiling.

Embodiment 3

[0049] A hot-rolled dual-phase steel, composed of ferrite (F) and martensite, the mass percent of its chemical composition is: C: 0.08%, Mn: 1.63%, Si: 0.47%, P: 0.015%, S : 0.003%, Als: 0.031%, Nb: 0.030%, and the balance is iron and unavoidable impurities.

[0050] A method for preventing the hot-rolled dual-phase steel flat coil, comprising the steps of:

[0051] The difference from Example 1 is:

[0052] In the step (1), the steel billet is heated to 1240°C through a regenerative heating furnace, and the time in the furnace is 200min, and a heat preservation cover is used;

[0053] The starting temperature of the rough rolling unit in the step (4) is 1160° C.;

[0054] In the step (7), the finish rolling inlet temperature is 960°C, and the finish rolling exit temperature is 850°C;

[0055] In the step (9), after the steel strip leaves the finishing mill, the first set of laminar water cooling is turned on, and after cooling to 680°C, air cooling is carried out for 6-10s...

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Abstract

A hot-rolled dual-phase steel and a method for preventing the manufacture of hot-rolled dual-phase steel flat coils mainly solve the problem of flat coils in the production of existing hot-rolled dual-phase steels. The invention provides a hot-rolled dual-phase steel. The dual-phase steel is composed of ferrite and martensite. The mass percentages of its chemical components are: C: 0.05%-0.10%, Mn: 1.40%-1.70%, : 0.35% to 0.60%, P: ≤0.03%, S: ≤0.01%, Als: 0.015% to 0.07%, Nb: 0.01% to 0.04%, and the balance is iron and unavoidable impurities. Furthermore, a method for manufacturing the hot-rolled dual-phase steel flat coil is provided, and the realization steps are as follows: molten iron pretreatment→converter smelting→external refining→wide slab continuous casting→2300mm unit hot rolling→coiling→inspection→packing for delivery . The process method of the present invention has low production cost, and effectively improves the flat coil problem of hot-rolled dual-phase steel, and reduces the uncoiling caused by flat coils during production, which leads to unusable steel coils and unnecessary economic losses. .

Description

technical field [0001] The invention relates to a hot-rolled dual-phase steel and a method for manufacturing the hot-rolled dual-phase steel flat coil, belonging to the technical field of hot-rolled dual-phase steel manufacture. Background technique [0002] Dual-phase steel refers to low-carbon steel or low-carbon alloy steel obtained through critical zone heat treatment or controlled rolling process. It is an advanced high-strength steel mainly composed of ferrite (F) + a small amount of martensite (M). Ordinary High-strength steel refines the grains through controlled rolling and strengthens the matrix through the precipitation of carbonitrides of microalloying elements, while dual-phase steels have harder horses dispersed in pure ferrite grain boundaries or within grains. Tensile phase, so its strength and toughness have been well coordinated. [0003] Hot-rolled dual-phase steel is mainly divided into two types: low-temperature coiling type and medium-temperature coili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12B21B1/46B21B37/74B21B45/02
CPCB21B1/46B21B37/74B21B45/0203C21D2211/005C21D2211/008C22C38/12
Inventor 郭鹏史志勇左远鸿果强刘元博
Owner BENGANG STEEL PLATES
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