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Steel for ship and preparation method of steel

A technology for steel and hull, applied in the field of steel for hull and its preparation, can solve the problems of insufficient impact toughness, low welding performance, poor corrosion resistance, etc., and achieve the goal of improving strength, good mechanical strength, and preventing grain boundary and dislocation migration Effect

Inactive Publication Date: 2017-10-17
合肥博创机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the problems faced by marine steel mainly include the following aspects: 1) low strength; 2) poor corrosion resistance; 3) low hardness; 4) insufficient impact toughness; 5) low welding performance; 6) poor frost resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The above-mentioned preparation method of steel for a hull is carried out according to the following steps:

[0029] (1) Put industrial raw materials ferromanganese, ferrochrome, ferromolybdenum, ferronickel, limestone, dolomite and silicon carbide in an electric furnace for smelting, control the composition of the mother liquor in the electric furnace within the above percentage content, and control the temperature of the molten steel at 1520°C;

[0030] (2) Transfer the released mother liquor to the argon-oxygen refining furnace for oxygen blowing decarburization, nitrogen blowing and composition adjustment (regulated according to the above table 1);

[0031] (3) Cast molten steel into ingots at 1640°C;

[0032] (4) Forging the above-mentioned ingot at 1080° C. into a steel product, and then further hot-rolling it into a 1 mm steel plate;

[0033] (5) Finally, the rolled steel plate is subjected to solid solution and quenching treatment, and the temperature of soluti...

Embodiment 2

[0035] The above-mentioned preparation method of steel for a hull is carried out according to the following steps:

[0036] (1) Put industrial raw materials ferromanganese, ferrochrome, ferromolybdenum, ferronickel, limestone, dolomite and silicon carbide in an electric furnace for smelting, control the composition of the mother liquor in the electric furnace within the above percentage content, and control the temperature of the molten steel at 1600°C;

[0037] (2) Transfer the released mother liquor to the argon-oxygen refining furnace for oxygen blowing decarburization, nitrogen blowing and composition adjustment (regulated according to the above table 1);

[0038] (3) Cast molten steel into ingots at 1700°C;

[0039] (4) Forging the above-mentioned ingot at 1120° C. into steel, and then further hot-rolling it into a 3mm steel plate;

[0040] (5) Finally, the rolled steel plate is subjected to solid solution and quenching treatment, and the temperature of solution treatmen...

Embodiment 3

[0042] The above-mentioned preparation method of steel for a hull is carried out according to the following steps:

[0043] (1) Put the industrial raw materials ferromanganese, ferrochrome, ferromolybdenum, ferronickel, limestone, dolomite and silicon carbide in an electric furnace for smelting, control the composition of the mother liquor in the electric furnace within the above percentage content, and control the temperature of molten steel out of the furnace at 1680°C;

[0044] (2) Transfer the released mother liquor to the argon-oxygen refining furnace for oxygen blowing decarburization, nitrogen blowing and composition adjustment (regulated according to the above table 1);

[0045] (3) Cast molten steel into ingots at 1760°C;

[0046] (4) Forging the above-mentioned ingot at 1080-1160° C. into steel, and then further hot-rolling it into a 5 mm steel plate;

[0047] (5) Finally, the rolled steel plate is subjected to solid solution and quenching treatment, and the tempera...

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Abstract

The invention discloses steel for a ship and a preparation method of the steel and relates to the field of steel machining. The steel comprises the following components of, by weight, 0.38-0.64% of C, 0.21-0.37% of Mn, 0.20-0.30% of Ni, 0.23-0.41% of Cr, 0.28-0.40% of Si, 0.12-0.24% of Al, 0.08-0.16% of Mo, 0.03-0.07% of Ti, 0.01-0.03% of Te, 0.004-0.008% of Nb, the balance Fe and inevitable impurities. The preparation method of the steel comprises the steps that industrial raw materials are placed into an electric furnace to be smelted, and components of a mother solution in the electric furnace are controlled; then the mother solution moved out of the furnace is transferred into an argon-oxygen refining furnace to be subjected to blowing oxygen decarburization, nitrogen blowing and component adjusting; later on, molten steel is cast into an ingot, and then the ingot is subjected to forging and hot rolling to be manufactured into a steel plate; and finally, after solution treatment and quenching treatment, the steel can be obtained. The steel for the steel can well withstand corrosion of seawater, and is high in strength, good in impact toughness, excellent in machining property and high in welding property. The service life of the steel for the ship is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of steel processing, and in particular relates to a steel for a hull and a preparation method thereof. Background technique [0002] Marine steel refers to thin steel plates and thick steel plates produced with special structural steel for shipbuilding and used to manufacture hull structures for oceangoing, coastal and inland waterway ships. Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion, electrochemical corrosion, marine organisms, and microbial corrosion of seawater; the hull is subjected to large wind and wave impacts and alternating loads; the shape of the ship makes the processing method complex and other factors, so for The requirements for steel for hull structure are strict. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, welding performance, processing and forming performance and surface q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/44C22C38/48C22C38/50C22C38/02C22C38/04C22C38/06C22C33/04B21C37/02
CPCB21C37/02C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/60
Inventor 何飞
Owner 合肥博创机械制造有限公司
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