E40 high-strength ship plate steel and method for manufacturing same

A ship plate steel, high-strength technology, applied in the field of E40 high-strength ship plate steel and its preparation, can solve the problems of large deformation resistance of wide and thick rolled pieces, harsh requirements for rolling mill equipment, uneven temperature gradient structure, etc., and achieve good welding performance and microstructure Good uniformity control and uniform tissue effect

Active Publication Date: 2013-07-17
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many problems. The high price of alloy elements such as Cu and Nh greatly increases the production cost, and the large thickness of the billet brings difficulties to the uniformity of continuous casting; During the process, the temperature gradient causes uneven structure, different properties along the thickness direction, insufficient low-temperature impact toughness in the core, and plate size control, etc.

Method used

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  • E40 high-strength ship plate steel and method for manufacturing same

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Effect test

Embodiment 1

[0029] Embodiment 1, a kind of E40 high-strength ship plate steel, comprises following chemical composition according to quality percentage : C: 0.13%, Si: 0.25%, Mn: 1.56%, P: ≤0.03%, S: ≤0.005%, Ni: 0.25%, V: 0.035%, Nb: 0.030%, Ti: 0.015%, Als: 0.020%, the balance is Fe.

[0030] The preparation method of the above-mentioned E40 high-strength ship plate steel is as follows. In the molten iron pretreatment process, the molten iron at the station must remove the front slag and the rear slag to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. %, to ensure desulfurization cycle ≤ 21min, desulfurization temperature drop ≤ 20 ℃.

[0031] In the converter smelting process, S≤0.005% and P≤0.080% of the molten iron into the furnace, the temperature of the molten iron is ≥1270°C, the loading error of the molten iron is controlled by ±1t, the scrap steel is strictly made of high-quality leftover materials, and the position of the process gun is 1.0~ 1.3m...

Embodiment 2

[0039] Example 2, an E40 high-strength ship plate steel, which contains the following chemical components by mass percentage: C: 0.16%, Si: 0.30%, Mn: 1.6%, P: ≤0.03%, S: ≤0.005%, Ni: 0.35%, V: 0.045%, Nb: 0.040%, Ti: 0.020%, Als: 0.030%, and the balance is Fe.

[0040] The preparation method of the above-mentioned E40 high-strength ship plate steel is as follows. In the molten iron pretreatment process, the molten iron at the station must remove the front slag and the rear slag to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. %, to ensure desulfurization cycle ≤ 21min, desulfurization temperature drop ≤ 20 ℃.

[0041] In the converter smelting process, S≤0.005% and P≤0.080% of the molten iron into the furnace, the temperature of the molten iron is ≥1270°C, the loading error of the molten iron is controlled by ±1t, the scrap steel is strictly made of high-quality leftover materials, and the position of the process gun is 1.0~ 1.3m, mid-term 1.2-1...

Embodiment 3

[0049] Example 3, an E40 high-strength ship plate steel, comprising the following chemical components by mass percentage: C: 0.14%, Si: 0.25%, Mn: 1.5%, P: ≤0.025%, S: ≤0.005%, Ni: 0.006%, V: 0.001%, Nb: 0.006%, Ti: 0.010%, Als: 0.015%, and the balance is Fe.

[0050] The preparation method of the above-mentioned E40 high-strength ship plate steel is as follows. In the molten iron pretreatment process, the molten iron at the station must remove the front slag and the rear slag to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. %, to ensure desulfurization cycle ≤ 21min, desulfurization temperature drop ≤ 20 ℃.

[0051] In the converter smelting process, S≤0.005% and P≤0.080% of the molten iron into the furnace, the temperature of the molten iron is ≥1270°C, the loading error of the molten iron is controlled by ±1t, the scrap steel is strictly made of high-quality leftover materials, and the position of the process gun is 1.0~ 1.3m, mid-term 1.2-1.6...

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Abstract

The invention discloses E40 high-strength ship plate steel. The E40 high-strength ship plate steel comprises, by mass, from 0.13% to 0.16% of C, from 0.2% to 0.4% of Si, from 1.5% to 1.6% of Mn, lower than or equal to 0.03% of P, lower than or equal to 0.005% of S, from 0.30% to 0.35% of Ni, from 0.055% to 0.065% of V, from 0.035% to 0.045% of Nb, from 0.010% to 0.020% of Ti, from 0.015% to 0.035% of Als and the balance Fe. A method for manufacturing the E40 high-strength ship plate steel includes a pretreatment process for melted iron, a smelting process implemented by the aid of a converter, an argon blowing treatment process, an LF (ladle furnace) refining process, a VD (vacuum degasser) refining process, a continuous casting process, a heating process, a controlled rolling and controlled cooling process, a stack cooling process and a heat treatment process. The E40 high-strength ship plate steel and the method have the advantages that the E40 high-strength steel is successfully developed, the yield strength of the E40 high-strength ship plate steel ranges from 430MPa to 450MPa, the tensile strength of the E40 high-strength ship plate steel ranges from 550MPa to 580MPa, the elongation of the E40 high-strength ship plate steel ranges from 22% to 24%, V-type impact power of the E40 high-strength ship plate steel ranges from 210J to 280J at the temperature of minus 40 DEG C, and performance indexes of a steel plate made of the E40 high-strength ship plate steel completely meet standards and requirements of clients.

Description

technical field [0001] The invention relates to a ship plate steel and a preparation method thereof, in particular to an E40 high-strength ship plate steel and a preparation method thereof. Background technique [0002] The shipbuilding industry is one of the pillar industries of my country's national economy. It has developed rapidly in recent years and provides a broad application prospect for the application of hull structural steel. The steel plate for shipbuilding is the main raw material for shipbuilding. In the weight of the hull, steel accounts for 90%. Plates account for 70% to 80% of steel. Marine steel is mainly used for the deck, outer plate, bottom plate and cabin structure of the hull. With the rapid development of the world economy, it is still the direction of the shipbuilding industry to develop in the direction of large-scale and high-tech, but the shipbuilding industry feels that the strength of ordinary strength hull steel is not enough to meet its develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 李亮朱书成许少普李忠波杨阳王新唐郑磊康文举
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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