Low-cost steel-making process for manufacturing flaw detection plate

A low-cost and technological technology, applied in the field of low-cost steelmaking technology, can solve the problems of difficult production organization, affecting delivery time, long production cycle, etc., to shorten the production organization and preparation cycle, easy to operate, and reduce production costs. Effect

Inactive Publication Date: 2013-05-01
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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Problems solved by technology

However, the cost of this process route is relatively high in actual production, and because the duplex process should consider the production coordination between multiple processes, the production o

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  • Low-cost steel-making process for manufacturing flaw detection plate

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Embodiment Construction

[0016] The present invention will be further described below through embodiment.

[0017] This embodiment is to produce 28mm Q345B flaw detection plate.

[0018] The composition of Q345B flaw detection plate is shown in the table below

[0019]

[0020] The specific process steps of the present embodiment:

[0021] ① The end point of the converter is controlled at 1660°C-1675°C, the end point target: [C]=0.06-0.10%, [P]≤0.015%, [S]≤0.030%, low temperature tapping, the oxygen content in the end point steel is less than 600ppm;

[0022] ② Add 150 kg of slag washing material after the furnace, and add 1.25 kg of slag washing material per ton of steel;

[0023] ③The aluminum content in the steel is controlled at 300ppm at LF outbound; the sulfur content in the steel is reduced to 75ppm in the LF process, the refining time is not less than 35 minutes, and the net argon blowing time after calcium treatment is not less than 5 minutes, and the liquid surface of the molten steel i...

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Abstract

The invention relates to a low-cost steel-making process for manufacturing a flaw detection plate, which belongs to the technical field of steel-making operation processes. The technical scheme adopted by the process is as follows: (1), low-temperature tapping of a converter; (2) furnace slag washing; (3), ingredient high alumina control, ladle furnace (LF) deep deanlphurization, and atmosphere control; (4), fore-and-aft substantially rocking furnace; (5), slightly continuous casting pressing; (6), pouring descending order control; (7), casting blank stacking slow cooling; and (8), ensuring the thickness ratio of a casting blank and a steel plate to be greater than 8:1. The low-cost steel-making process has the advantages and benefits that the process is simple and convenient, saves a technical procedure of vacuum treatment, is a new way for preparing a low-cost flaw detection plate, has a more remarkable effect particularly aiming at products with thickness less than 30 mm, can reach a flaw detection qualified rate over 99 percent, achieves that the flaw detection plate is manufactured by utilizing a short refining process, and lowers manufacturing cost; and in addition, a single refining process route overcomes the defect of large difficulty of double refining manufacturing organization, greatly shortens the periods of the manufacturing organization and preparation, and achieves efficient production, and the process has higher application popularization value.

Description

technical field [0001] The invention relates to a low-cost steelmaking process for producing flaw detection plates, and belongs to the technical field of steelmaking operation processes. Background technique [0002] At present, the steel plate for ultrasonic flaw detection (referred to as the flaw detection plate) has high requirements on its internal quality, and small internal defects will also cause flaw detection failures. The reasons for flaw detection failure mainly involve two aspects: the composition of molten steel and the internal quality of the slab. In order to ensure the qualified rate of flaw detection, the production process of the background technology is controlled from the above two links. In order to minimize the influence of carbon and sulfur segregation and inclusions on the quality of the slab, LF is used to carry out the combination of deep desulfurization and RH degassing and deinclusion. The process can purify the quality of molten steel to the gre...

Claims

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Application Information

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IPC IPC(8): C21C7/064B22D11/16B22D11/18B22D11/22
Inventor 郭景瑞吝章国李金波孙玉虎郭辉李建文成慧梅侯钢铁
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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