Low-alloy Q345D thick plate produced without adding micro-alloy elements and production method thereof

A low-alloy and micro-alloy technology, applied in temperature control, etc., can solve problems such as unfavorable cost reduction and efficiency increase, high price, and increased production cost

Active Publication Date: 2011-06-01
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the current environment, the production of low-alloy Q345D steel plates is usually added with expensive micro-alloying elements Nb and V, which increases the production cost of the enterprise, is not conducive to cost reduction and efficiency increase, and is not conducive to coping with the adverse effects of the international financial crisis. Realize the low-cost strategy and enhance the competitiveness of enterprises

Method used

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  • Low-alloy Q345D thick plate produced without adding micro-alloy elements and production method thereof

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Effect test

Embodiment 1

[0021] A low-alloy Q345D thick plate produced without adding microalloying elements, containing the following chemical components in mass percentages (unit, wt%): C: 0.13, Si: 0.30, Mn: 1.15, P: 0.020, S: 0.05, Als : 0.020, others are Fe and residual elements;

Embodiment 2

[0023] A low-alloy Q345D thick plate produced without adding microalloying elements, containing the following chemical components in mass percentages (unit, wt%): C: 0.19, Si: 0.50, Mn: 1.55, P: 0.010, S: 0.010, Als : 0.040, others are Fe and residual elements;

Embodiment 3

[0025]A low-alloy Q345D thick plate produced without adding micro-alloying elements, containing the following chemical components in mass percentages (unit, wt%): C: 0.16, Si: 0.40, Mn: 1.35, P≤0.015, S≤0.008, Als : ≤0.030, others are Fe and residual elements; 2. KR molten iron pretreatment process: the molten iron must be scraped before and after the slag is removed to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. After the molten iron is stirred and desulfurized by KR, the molten iron S≤ 0.005%, guaranteed desulfurization cycle ≤ 21min, desulfurization temperature drop ≤ 20 ℃. 3. Converter smelting process: S ≤ 0.005%, P ≤ 0.080% of molten iron, temperature of molten iron ≥ 1250 ℃, the error of molten iron loading is controlled by ± 1t, scrap steel strictly adopts high-quality leftover materials, and the position of the process gun is 1.0-1.3 in the previous period m, 1.2-1.6m in the middle period, and 1.0-1.1m in the later period, the slagging ...

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Abstract

The invention discloses a low-alloy Q345D thick plate produced without adding micro-alloy elements and a production method thereof. The method disclosed by the invention is characterized in that on the premise of not adopting vacuum decarburization equipment such as an RH and the like, through using the existing equipment such as a VD (vacuum degasser) and the like of enterprises, the requirements for smelting low-carbon steel plates and extreme low carbon steel plates are met, therefore, under the condition that the profits of the enterprises at the present stage are not high, a heavy investment in large-scale equipment replacement and remodeling is avoided, thereby saving the investment for the enterprises, completely using the existing equipment of the enterprises, greatly reducing the capital investment of the enterprises at the present stage, and providing abundant preparation time for equipment replacement after the market situation takes a favorable turn in the future and the profits of the enterprises are improved.

Description

technical field [0001] The invention relates to the technical field of medium and thick plate production technology, in particular to a production method of low-alloy Q345D thick plate without adding microalloy elements and a production method thereof. Background technique [0002] The current international financial crisis has had a great impact on my country's iron and steel enterprises, especially the medium and heavy plate industry of steel mills is an industry that has been severely impacted. In order to cope with the adverse effects of the international financial crisis, we must speed up structural adjustment and promote industrial upgrading. , to achieve a low-cost strategy, and enhance the competitiveness of enterprises has a very important role. Under the current environment, the production of low-alloy Q345D steel plates is usually added with expensive micro-alloying elements Nb and V, which increases the production cost of the enterprise, is not conducive to cost r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06B21B37/74
Inventor 刘庆波别晓娟郭艳芳雷文慧庞百鸣陈平张兵朱成杰宋君君崔冠军赵迪杨东
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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