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Low-alloy Q345E medium plate and production process thereof

A thick steel plate and low alloy technology, applied in the field of medium and heavy plate production, can solve the problems of complex process and high production cost, and achieve the effect of reducing production cost, ensuring the matching of strength and plasticity, and reducing heating temperature

Inactive Publication Date: 2011-05-04
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are not many domestic manufacturers of low-alloy Q345D-Z35 medium-thick steel plates, because in the production process, micro-alloying elements such as Nb, V, and Ti are added, and the production cost is high; the process is complicated

Method used

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  • Low-alloy Q345E medium plate and production process thereof

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Embodiment Construction

[0013] The low-alloy Q345E medium-thick steel plate of the present invention contains the following chemical components in mass percentage (unit, wt%): C: 0.13-0.19, Si: 0.20-0.50, Mn: 1.30-1.60, P≤0.020, S≤0.010, Als: 0.015~0.050, others are Fe and residual elements;

[0014] Carbon equivalent [Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15]: ≤0.46.

[0015] In the aforementioned method, the thickness of the produced steel plate is 60 mm or less.

[0016] The technological process of the present invention is: high-quality molten iron, KR molten iron pretreatment, top-bottom combined blowing converter, LF furnace refining, slab stack cooling, heating furnace, rolling, ACC laminar flow cooling, hot straightener, stack cooling, refining Refinement, external inspection, flaw detection, and storage; in the refining step, argon is blown throughout the process, and refining slag is added, the alkalinity is controlled at 4.0-6.0, and the heating time is controlled at two times, the first heating...

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Abstract

The invention discloses a low-alloy Q345E medium plate produced without adding micro-alloy element and a production process thereof. The low-alloy Q345E medium plate comprises the following chemical components in percentage by weight: 0.13-0.19% of C, 0.20-0.50% of Si, 1.30-1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.015-0.050% of Als, and the balance of Fe and residual elements. The process disclosed by the invention comprises the following steps: KR (knotted reactor) hot metal pretreatment of high-quality hot metal, processing with a top-bottom combined blowing converter, LF ((ladle furnace) refining, casting blank stack cooling, processing with a heating furnace, rolling, ACC (accelerated cooling) laminar flow cooling, processing with a hot straightener, stack cooling, finishing, external inspection, flaw detection and storage. The invention has the beneficial effects that: compared with the traditional Q345E, precious alloys such as Nb, Ti and the like are not added without changing the carbon equivalent, all performance indexes of Q345E are guaranteed, and the production cost is remarkably reduced.

Description

technical field [0001] The invention relates to the production of medium-thick plates, in particular to a production process of low-alloy Q345E medium-thick steel plates without adding microalloy elements and a production process 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. At present, there are not many domestic manufacturers of low-alloy Q345D-Z35 medium-thick steel plates, because in the production process, micro-alloying elements such as Nb, V, and Ti are added, and the production cost is high; the proces...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21C7/06C21C7/10C21C7/064B21B37/74
CPCY02P10/20
Inventor 高照海朱书成许少普张立新崔冠军袁少威李忠波袁永旗于飒李亮徐璠彭卡丽
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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