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Diphasic steel plate by continuous casting and rolling middle bar strip and manufacturing method thereof

A medium-thin slab continuous casting and manufacturing method technology, which is applied in metal rolling and other directions, can solve problems such as difficulty in ensuring the shape of the slab, achieve huge economic and social benefits, improve safety levels, and reduce vehicle weight.

Active Publication Date: 2008-02-27
ANGANG STEEL CO LTD
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AI Technical Summary

Problems solved by technology

Its shortcomings are: rolling in the two-phase region is easy to produce mixed crystals; rapid cooling to room temperature after rolling requires a large cooling capacity and rolling mill coiling capacity, and it is not easy to ensure the shape of the plate
The application object of this patented technology is the steel plate for pipelines. After rolling, it is cooled to below 400°C. It also requires a large coiling capacity and a good guarantee for the shape of the steel plate. Generally, steel mills do not have this ability.

Method used

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Embodiment Construction

[0027] The embodiment of the present invention is as follows: heat the continuous casting slab (170mm×1500mm) to 1150-1300°C, heat it for 2-5 hours, then carry out rough rolling, cover the heat preservation cover after the rough rolling, and then finish rolling under high pressure in multiple passes, The final rolling temperature is 800-950°C, laminar cooling is adopted after rolling, and the cooling is divided into three stages, stage I: target temperature is 720-800°C, cooling rate 10-20°C / s; stage II: air cooling for 2-8 seconds ; Stage III: Cool to the coiling temperature at a cooling rate greater than 20°C / s, and the coiling temperature is less than 650°C. The finished thickness of the steel plate is 4mm. The specific steel composition of the five embodiments of the present invention is shown in Table 1, the actual rolling system is shown in Table 2, and the various performance indexes of the steel plate are shown in Table 3.

[0028] Table 1 Melting composition of the d...

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Abstract

The present invention provides a dual phase steel sheet made up by using medium-thin sheet billet through a certain continuous-casting and continuous-rolling process. The component composition of said steel sheet includes (by wt%) 0.04%-0.11% of C, 0.02%-1.5% of Si, 0.6%-2.50% of Mn, 0.02%-2.0% of Cr, also can contain Mo or Ti, the rest is Fe and unavoidable impurity. The microscopic structure of said steel sheet includes: matrix phase is ferrite and second phase mainly is martensite. Besides, said invention also provides the concrete operation steps of its production method.

Description

technical field [0001] The invention belongs to a hot-rolled steel plate and its manufacturing technology, in particular to a steel plate with a dual-phase structure produced by a medium-thin slab continuous casting and rolling production line and a manufacturing method thereof. Background technique [0002] Dual-phase steel is obtained from low-carbon steel or low-alloy high-strength steel through critical zone treatment or controlled rolling. It is a high-strength steel mainly composed of ferrite and martensite. It is mainly composed of ferrite (F) + a small amount (<25%) of transformation phase (generally martensite M). This kind of steel was first proposed by the United States in 1968. It was not until 1975 that Hayami and Furukawa made a complete description of the microstructure, chemical composition, mechanical properties and formability of this type of steel that dual-phase steel was known. know. The microstructure of dual-phase steel is characterized by hard is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04B21B1/46
Inventor 时晓光沙孝春陈新关菊乔立峰董浩然刘仁东张紫茵李桂艳
Owner ANGANG STEEL CO LTD
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