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Extra-thick steel plate for container ship and preparation method thereof

A technology of extra-thick steel plates and container ships, which is applied in the field of metallurgy, can solve problems such as poor low-temperature toughness, and deterioration of brittle cracks, achieve excellent crack arrest performance, enhance crack arrest performance and toughness, and reduce production costs.

Active Publication Date: 2016-06-08
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature toughness of bainite structure is poor, and the characteristics of brittle crack occurrence are significantly deteriorated

Method used

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  • Extra-thick steel plate for container ship and preparation method thereof
  • Extra-thick steel plate for container ship and preparation method thereof
  • Extra-thick steel plate for container ship and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The proportions of each component of the 70mm large thickness container ship steel of the present embodiment are as follows:

[0030] C: 0.080%, Si: 0.35%, Mn: 1.55%, P: 0.0080%, S: 0.0011%, Ni: 0.45%, Nb: 0.025%, V: 0.045%, Ti: 0.020%, Alt: 0.035%, The rest is Fe and unavoidable impurities.

[0031] Among them, the content of impurities is controlled at O≤0.0015%, N≤0.0050%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.

[0032] During the preparation, the low-phosphorus-sulfur smelting process is adopted, and other trace alloy elements are used to effectively enhance the lamellar tear resistance and brittle crack arrest performance of the steel. Controlled rolling and controlled cooling technology is used to ensure uniform structure and performance of the steel plate, and to obtain large-thickness container ship steel with excellent tearing performance and crack arrest performance. The main process route is: hot metal desulfurization pretreatment→converter ...

Embodiment 2

[0036] The proportions of each component of the large-thickness container ship steel of the present embodiment are as follows:

[0037] C: 0.056%, Si: 0.45%, Mn: 1.64%, P: 0.0078%, S: 0.0013%, Ni: 0.55%, Nb: 0.045%, V: 0.038%, Ti: 0.019%, Alt: 0.033%, The rest is Fe and unavoidable impurities.

[0038] Among them, the content of impurities is controlled at O≤0.0015%, N≤0.0050%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.

[0039] During the preparation, the low-phosphorus-sulfur smelting process is adopted, and other trace alloy elements are used to effectively enhance the lamellar tear resistance and brittle crack arrest performance of the steel. Controlled rolling and controlled cooling technology is used to ensure uniform structure and performance of the steel plate, and to obtain large-thickness container ship steel with excellent tearing performance and crack arrest performance. The main process route is: hot metal desulfurization pretreatment→converter smeltin...

Embodiment 3

[0043] The proportions of each component of the large-thickness container ship steel of the present embodiment are as follows:

[0044] C: 0.096%, Si: 0.34%, Mn: 1.48%, P: 0.0068%, S: 0.0012%, Ni: 0.48%, Nb: 0.034%, V: 0.040%, Ti: 0.022%, Alt: 0.035%, The rest is Fe and unavoidable impurities.

[0045] Among them, the content of impurities is controlled at O≤0.0015%, N≤0.0050%, H≤0.0003%, As≤0.010%, Pb≤0.010%, Sn≤0.010%, Sb≤0.010%.

[0046] During the preparation, the low-phosphorus-sulfur smelting process is adopted, and other trace alloy elements are used to effectively enhance the lamellar tear resistance and brittle crack arrest performance of the steel. Controlled rolling and controlled cooling technology is used to ensure uniform structure and performance of the steel plate, and to obtain large-thickness container ship steel with excellent tearing performance and crack arrest performance. The main process route is: hot metal desulfurization pretreatment→converter smelt...

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Abstract

The invention discloses a super-thick steel plate for container ships, which comprises the following components in percentage by weight: 0.04-0.12% of C, 0.25-0.50% of Si, 1.00-1.65% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0020% of S, 0.20-1.0% of Ni, 0.020-0.040% of Nb, 0.020-0.060% of V, 0.015-0.025% of Ti, 0.020-0.050% of Alt, and the balance of Fe and unavoidable impurities. The super-thick steel plate is prepared through the following production steps of molten iron pretreatment, BOF (basic oxygen furnace) steelmaking, LF (ladle refining) refining, RH (ruhrstahl heraeus) vacuum treatment, continuous casting, and TMCP (thermal mechanical control processing), the structure of an obtained super-thick steel plate for container ships comprises acicular ferrites, granular bainites and a small amount of pearlites, and the structure is uniform and small. The super-thick steel plate disclosed by the invention is simple in production process and low in cost, and has good lamellar tearing resistance, brittle crack preventing properties, high strength and high toughness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a high-performance marine structural steel and a preparation method thereof, in particular to an extra-thick steel plate for container ships and a preparation method thereof. Background technique [0002] In recent years, along with the increase in size of ships, the steel plates for shipbuilding have also developed in the direction of thicker plates. Especially for container ships, due to the requirements of their hull structure, thick plates with a thickness of 60-80mm have been used as high-strength components in hatch coamings, upper decks and other parts. The combination of hatch parts has adopted the high heat input welding technology, but, along with the thicker steel plates, the steel plates are required to further adapt to greater heat input welding. [0003] On the other hand, from the perspective of ensuring the safety of ships and preventing brittle fractures, ship ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04
CPCC21D8/0226C22C33/04C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 邱永清于生尹雨群赵晋斌邓伟
Owner NANJING IRON & STEEL CO LTD