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Large-thickness steel plate for oceaneering

A technology of marine engineering and large thickness, applied in the field of steel, can solve the problems of not meeting the requirements of use, small thickness, and less steel plate production, and achieve the effect of good thickness direction performance and weldability, low cost, and cost reduction

Inactive Publication Date: 2013-09-25
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of steel plates for marine engineering with a yield strength higher than 460MPa is less, and the thickness is small, which cannot meet the requirements for use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The large-thickness steel plate for marine engineering provided in this example is composed of the following components in weight percentage: C: 0.07%, Si: 0.25%, Mn: 1.40%, P: 0.012%, S: 0.005%, Ni: 0.70 %, Nb: 0.030%, Al: 0.020%, Mo: 0.17%, V: 0.04%, Ti: 0.012%, and the balance is Fe and unavoidable impurities.

[0030] The production method of the large-thickness marine engineering steel plate provided in this embodiment includes the following steps:

[0031] (1) Smelting: The molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. After the temperature of the molten steel reaches 1550°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree of the vacuum degassing treatment is 66.6Pa, and the vacuum holding time is 60 Minutes, after vacuum degassing treatment, continuous casting is carried out to obtain a continuous casting slab. The continuous casting temperature during continuous cas...

Embodiment 2

[0038] The large-thickness steel plate for marine engineering provided in this example is composed of the following components in weight percentage: C: 0.08%, Si: 0.15%, Mn: 1.50%, P: 0.010%, S: 0.003%, Ni: 0.60 %, Nb: 0.040%, Al: 0.045%, Mo: 0.13%, V: 0.05%, Ti: 0.020%, and the balance is Fe and unavoidable impurities.

[0039] The production method of the large-thickness marine engineering steel plate provided in this embodiment includes the following steps:

[0040] (1) Smelting: The molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. After the temperature of the molten steel reaches 1570°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree of the vacuum degassing treatment is 6Pa, and the vacuum holding time is 20 minutes. , continuous casting is carried out after vacuum degassing treatment, and the continuous casting slab is obtained. The continuous casting temperature during continu...

Embodiment 3

[0047] The large-thickness steel plate for marine engineering provided in this example is composed of the following components in weight percentage: C: 0.09%, Si: 0.40%, Mn: 1.40%, P: 0.011%, S: 0.005%, Ni: 0.70 %, Nb: 0.030%, Al: 0.030%, Mo: 0.14%, V: 0.04%, Ti: 0.015%, and the balance is Fe and unavoidable impurities.

[0048] The production method of the large-thickness marine engineering steel plate provided in this embodiment includes the following steps:

[0049] (1) Smelting: The molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. After the temperature of the molten steel reaches 1560°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree of the vacuum degassing treatment is 20 Pa, and the vacuum holding time is 40 minutes. , continuous casting was carried out after vacuum degassing treatment, and the continuous casting billet was obtained. The continuous casting temperature during c...

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Abstract

The invention belongs to the technical field of steel and iron, and in particular discloses a large-thickness steel plate for oceaneering and a production method thereof. The large-thickness steel plate for oceaneering comprises the following components in percentage by weight: 0.07-0.09 percent of C, 0.15-0.40 percent of Si, 1.40-1.50 percent of Mn, not more than 0.012 percent of C, not more than 0.005 percent of S, 0.60-0.70 percent of Ni, 0.030-0.040 percent of Nb, 0.020-0.045 percent of Al, 0.13-0.17 percent of Mo, 0.04-0.05 percent of V, 0.012-0.020 percent of Ti and the balance of Fe and inevitable impurities. The large-thickness steel plate for oceaneering has the advantages of pure steel quality, good low-temperature impact toughness, high thickness (Z direction) tensile cross section contractibility rate, large thickness, high strength, good low-temperature aging impact toughness and low product cost. The large-thickness steel plate for oceaneering, provided by the invention, is suitable for use of large-thickness structures for oceaneering.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a large-thickness steel plate for marine engineering and a production method thereof. Background technique [0002] With the inclusion of marine engineering into the "Twelfth Five-Year Plan", marine engineering equipment has been listed as an emerging industry. At the same time, the marine engineering equipment and facilities industry has also led to the rapid development of shipbuilding, equipment manufacturing, materials, metallurgy and other industries. Due to the relatively harsh service environment of marine engineering equipment, the technical indicators of the steel plates used are extremely high. Not only must they have high atmospheric corrosion resistance and seawater corrosion resistance, but also require high strength, high toughness, and easy welding. Judging from the current situation, steel plates for marine engineering with a yield strength below 355 MPa h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02C21D1/18
Inventor 韦明叶建军刘生张志军张海军王九清刘印子张东方张彦召
Owner WUYANG IRON & STEEL
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