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A kind of steel plate resistant to marine environment corrosion and preparation method thereof

A marine environment and steel plate technology, applied in the field of smelting, can solve the problems of low corrosion-resistant P content, complex procedures, and complex components, and achieve the effects of improving corrosion resistance, simple process control, and excellent corrosion resistance.

Inactive Publication Date: 2016-02-17
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The application number is 201010275268.8, and the patent name is "Production Method of Corrosion-resistant Ultra-thick Steel Plate". This patent provides a maximum thickness of 100mm, yield strength of 355MPa level, using continuous casting instead of die casting + ACC controlled rolling cooling + online normalizing The ultra-thick corrosion-resistant steel is produced by the process, the composition of the steel is complex, the V content is as high as 0.1%, the corrosion-resistant P content is low, and the process is complicated, and the normalizing process has the defect of offsetting the strengthening effect of the ACC controlled rolling cooling process. There is waste in the process

Method used

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  • A kind of steel plate resistant to marine environment corrosion and preparation method thereof
  • A kind of steel plate resistant to marine environment corrosion and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The chemical composition of the steel plate is:

[0058] C: 0.11%, Si: 0.15%, Mn: 1.12%, P: 0.09%, S: 0.003%, Nb: 0.016%, Ti: 0.028%, Cu: 0.51%, Ni: 0.48%. The rest is Fe and unavoidable impurities.

[0059] The preparation method of the steel plate includes molten iron pretreatment-converter smelting-refining-continuous casting-cold slab heating-rolling.

[0060] S=0.005% after molten iron pretreatment, and the exposed metal liquid surface accounts for 85% of the total area of ​​molten iron after slag removal;

[0061] The carbon at the end point of converter smelting is 0.06%, the tapping temperature is 1646°C, and the order of alloying is copper plate→nickel plate→ferrophosphorus→ferrosilicon manganese→ferrosilicon;

[0062] The LF refining molten steel treatment cycle is 42 minutes, and the CaFe feed line volume during the Ca treatment process is 1.55 m / ton;

[0063] The billet temperature in the billet heating stage is 1130°C; in the high temperature stage of th...

Embodiment 2

[0067] The chemical composition of the steel plate is:

[0068] C: 0.15%, Si: 0.22%, Mn: 0.93%, P: 0.11%, S: 0.005%, Nb: 0.023%, Ti: 0.021%, Cu: 0.0.52%, Ni: 0.43%. The rest is Fe and unavoidable impurities.

[0069] The preparation method of the steel plate includes molten iron pretreatment-converter smelting-refining-continuous casting-cold slab heating-rolling.

[0070] S=0.007% after pretreatment of molten iron, and the exposed metal liquid surface accounts for 90% of the total area of ​​molten iron after slag removal;

[0071] The carbon at the end point of converter smelting is 0.08%, the tapping temperature is 1641°C, and the order of alloying is copper plate → nickel plate → ferrophosphorus → ferrosilicon manganese → ferrosilicon;

[0072] The refining molten steel treatment cycle is 45 minutes, and the feeding CaFe line volume during the Ca treatment process is 1.71 m / ton;

[0073] The billet temperature in the heating stage is 1150°C; in the high temperature stage...

Embodiment 3

[0077] The chemical composition of the steel plate is:

[0078] C: 0.13%, Si: 0.30%, Mn: 1.19%, P: 0.10%, S: 0.007%, Nb: 0.028%, Ti: 0.025%, Cu: 0.50%, Ni: 0.46%. The rest is Fe and unavoidable impurities.

[0079] The preparation method of the steel plate includes molten iron pretreatment-converter smelting-refining-continuous casting-cold slab heating-rolling.

[0080] S=0.004% after pretreatment of molten iron, and the exposed metal liquid surface accounts for 85% of the total area of ​​molten iron after slag removal;

[0081] The carbon at the end of converter smelting is 0.07%, the tapping temperature is 1632°C, and the order of alloying is copper plate→nickel plate→ferrophosphorus→ferrosilicon manganese→ferrosilicon;

[0082] The LF refining molten steel treatment cycle is 44 minutes, and the amount of CaFe feed line in the Ca treatment process is 1.8 m / ton;

[0083] The billet temperature in the billet heating stage is 1170°C; in the high temperature stage of the rol...

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Abstract

The invention relates to a marine environment corrosion-resistant steel plate and a preparation method thereof. The steel plate comprises the following chemical components: 0.10%-0.16% of carbon, 0.10%-0.30% of silicon, 0.90%-1.20% of manganese, 0.08%-0.12% of phosphorus, not more than 0.010% of sulfur, 0.015-0.03% of niobium, 0.020%-0.030% of titanium, 0.50%-0.60% of copper, 0.40%-0.50% of nickel and the balance of iron and inevitable impurities. According to the method, the corrosion-resistant performance of the steel is improved from a plurality of aspects through unique component design and simple process control means. According to the steel plate produced by adopting the method, the yield strength is more than 500MPa, the corrosion-resistant factor is more than 6.0, the maximum thickness is 50mm, and the corrosion-resistant requirements on the steel caused by the marine environment can be met.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a corrosion-resistant high-strength low-alloy steel plate used in marine environments and a preparation method thereof. Background technique [0002] Corrosion of steel materials is mainly electrochemical corrosion. Due to the inhomogeneity of the internal composition and structure of the material, and the formation of an electrolyte film on the surface of the material by external moisture, a potential difference is formed inside the material and between the material and the external solution, causing electrochemical corrosion of the material, especially The damage caused by pitting is the most serious, and the essence of its induction is the inclusions in the steel. [0003] There are obvious differences between the marine environment and the inland environment, and they experience different marine atmospheric corrosion (4 to 5 times higher than the inland atmosphe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C33/04C21D8/02C21C7/076
CPCY02P10/20
Inventor 胡淑娥刘晓东侯东华王国栋刘玉珍温红霞王勇王京先
Owner JIGANG GRP