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Q550 D high-quality structural iron medium and heavy plate and production method thereof

A production method and technology for structural steel, applied in the field of steel manufacturing, can solve the problems of shortening the production process, production energy consumption, low production efficiency, complex process, etc., and achieve the effect of shortening the production process, simplifying the production process, and reducing the production energy consumption

Active Publication Date: 2012-05-02
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method that can solve the problems of complex process, low production efficiency and high cost in the production of high-strength and toughness structural steel Q550D (E) in the prior art, and cooperate with reasonable chemical composition design and TMCP rolling process to replace quenching and tempering or tempering Process the production process, so as to not only ensure the requirements of high strength, high toughness and good welding performance, but also simplify the production process, shorten the production process, and reduce production energy consumption. Q550D high-quality structural steel medium and thick plates suitable for large-scale production operations and their production method

Method used

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  • Q550 D high-quality structural iron medium and heavy plate and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The Q550D high-quality structural steel plate is manufactured with a width of 3800mm and a thickness of 50mm, and is manufactured using the following chemical components in mass percentages: C: 0.03wt%, Si: 0.20wt%, Mn: 1.30wt%, P: 0.010wt%, S: 0.005 wt%, Nb or / and V or / and Ti: 0.05 wt%, Mo: 0.10 wt%, B: 0.05 wt%, Als 0.050 wt%, and the rest is Fe. Carbon equivalent [Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15]=0.43. Its production method is carried out according to the following steps:

[0030] 1) Perform KR pretreatment on the high-quality molten iron smelted in the open hearth furnace: when the molten iron arrives at the station, the slag before and after the slag must be removed. Lowering 20°C, the desulfurized molten iron contains 0.005 wt% S in mass percentage.

[0031] 2) Converter smelting: the pretreated molten iron is introduced into a 100 / 120 ton top-bottom double-blown converter. It must be ensured that the S content in the molten iron entering the furnace is 0.00...

Embodiment 2

[0039] The Q550D high-quality structural steel plate is manufactured with a width of 3800mm and a thickness of 40mm, and is manufactured using the following chemical components in mass percentages: C: 0.06wt%, Si: 0.30wt%, Mn: 1.50wt%, P: 0.007wt%, S: 0.003wt%, Nb or / and V or / and Ti: 0.13wt%, Mo: 0.15wt%, B: 0.10wt%, Als: 0.030wt%, the rest is Fe. Carbon equivalent [Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15]: 0.40.

[0040] The production method is basically the same as that in Example 1, the only difference being that in step 1), the thickness of the slag layer on the molten iron surface is 15mm, the desulfurization cycle is 18min, the desulfurization temperature drop is 18°C, and the molten iron after desulfurization contains S 0.004 wt%; in step 2), the S content in the molten iron entering the furnace is 0.004 wt%, the P content is 0.070 wt%, the temperature of the molten iron is 1300°C, and the slagging basicity R control value is 3.0. The carbon content in the molten steel from...

Embodiment 3

[0042] The Q550D high-quality structural steel plate is manufactured with a width of 3800mm and a thickness of 25mm, and is manufactured using the following chemical components in mass percentages: C: 0.09wt%, Si: 0.40wt%, Mn: 1.65wt%, P: 0.005wt%, S: 0.002wt%, Nb or / and V or / and Ti: 0.20wt%, Mo: 0.20wt%, B: 0.15wt%, Als: ≤0.010wt%, the rest is Fe. Carbon equivalent [Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15]: 0.38.

[0043] The production method is basically the same as that in Example 1, the only difference being that in step 1), the thickness of the slag layer on the molten iron surface is 12mm, the desulfurization cycle is 16min, the desulfurization temperature drop is 14°C, and the molten iron after desulfurization contains S 0.002 wt%; in step 2), the S content in the molten iron entering the furnace is 0.003 wt%, the P content is 0.060 wt%, the temperature of the molten iron is 1360°C, and the slagging basicity R control value is 4.0. The molten steel contains 0.04 wt% of carb...

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Abstract

The invention discloses a Q550 D high-quality structural iron medium and heavy plate, produced by smelting and rolling C, Si, Mn, Nb, V, Ti, Mo, B, Als and Fe. According to the invention, by properly adjusting the content and proportion of C, Mn, Nb, V, Ti, and Mo in the Q550D(E), strictly controlling the content of P and S, and cooperating the production technology disclosed herein, the characteristics of low carbon equivalent, high strength, high toughness, good weldability and the like of the structural iron medium and heavy plate can be guaranteed, the production technology can be simplified, the production flow can be shortened, and the production energy consumption can be reduced. The Q550 D high-quality structural iron medium and heavy plate is suitable for large-scale production operation.

Description

technical field [0001] The invention belongs to the technical field of steel manufacturing, and in particular relates to a Q550D high-quality structural steel plate and a production method thereof. Background technique [0002] Low-alloy high-strength wide-thick steel plate is a product clearly stated in the iron and steel industry development policy to encourage production. It is a resource-saving steel product, and it is also a typical high-tech and high value-added product. It is widely used in various important fields of the national economy such as energy, transportation, construction, and engineering machinery, and has great market potential. With the technological upgrading of the steel demand industry, new and higher requirements are constantly put forward for the performance of steel. Wide and thick steel plates are a leading product belonging to medium and heavy plates in the steel product category, generally referring to steel plates with a width of more than 300...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C21C1/02C21C5/35C21C7/072C21C7/10B22D11/18C21D8/02B21B37/74B21B37/58
Inventor 朱书成高照海许少普张立新崔冠军李忠波袁永旗于飒李亮亮刘庆波赵迪贾涛张强
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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