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Corrosion-resistant mooring chain steel and preparation method thereof

A technology of corrosion-resistant and mooring chain steel, applied in the direction of improving process efficiency, etc., can solve the problems of high overall alloy composition, internal cracks in materials, and affecting welding performance, etc., achieve excellent welding performance and plasticity, extend service life, reduce Effect of Alloy Content

Inactive Publication Date: 2019-01-04
镇江宝海船舶五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has the following problems: ⅰ carbon equivalent is high, which affects welding performance; ⅱ the production cost of electric furnace is higher than that of converter; Otherwise, the material will undergo structural transformation during placement, resulting in structural stress, resulting in internal cracks in the material; ⅳThe alkali resistance of the steel in an alkaline environment is similar to that of ordinary mooring chain steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A corrosion-resistant mooring chain steel, its composition and weight percentage are: C: 0.27%, Si: 0.15%, Mn: 0.6%, Cr: 0.8%, Mo: 0.2%; P: .015%, S: 0.005%, B 0.001%, V 0.03%, Ni: 0.3%; Cu 0.1%, Nb: 0.060%, Als 0.025%, Ni 0.1%, Ca 0.001%, the rest is Fe and residual trace elements, through (1) Electric furnace or converter smelting; (2)) LF furnace refining; (3) RH vacuum degassing; (4) continuous casting; (5) slab heating furnace heating; (6) rolling; (7) forging; (8) Prepared by quenching and tempering heat treatment.

[0026] The preparation method of the above-mentioned corrosion-resistant mooring chain comprises the following specific steps:

[0027] 1) Desulfurization of molten iron: Desulfurization by spraying magnesium powder, controlling S≦0.01% in molten iron leaving the station after desulfurization, and operating without leaving slag.

[0028] 2) Carry out converter smelting: adopt top-bottom composite blowing, control the amount of non-steel added to acc...

Embodiment 2

[0039] A corrosion-resistant mooring chain steel, its composition and weight percentage are: C: 0.28%, Si: 0.20%, Mn: 1.0%, Cr: 0.9%, Mo: 0.3%; P: 0.010%, S: 0.001 %, B: 0.003%, V: 0.04%, Ni: 0.35%; Cu: 0.2%, Nb: 0.07%, Als: 0.030%, Ni: 0.20%, Ca: 0.005%, the rest is Fe and residual trace elements , through (1) electric furnace or converter smelting; (2)) LF furnace refining; (3) RH vacuum degassing; (4) continuous casting; (5) billet heating furnace heating; (6) rolling; (7) Forging; (8) Prepared by quenching and tempering heat treatment.

[0040] The preparation method of above-mentioned corrosion-resistant mooring chain steel comprises the steps:

[0041] 1) Desulfurization of molten iron: Desulfurization by spraying magnesium powder, controlling S≦0.01% in molten iron leaving the station after desulfurization, and operating without leaving slag.

[0042]2) Carry out converter smelting: adopt top-bottom composite blowing, control the amount of non-steel added to account f...

Embodiment 3

[0053] A corrosion-resistant mooring chain steel, its composition and weight percentage are: C: 0.30%, Si: 0.35%, Mn: 1.2%, Cr: 1.0%, Mo: 0.5%; P: 0.010%, S: 0.001 %, B: 0.003%, V: 0.05%, Ni: 0.4%; Cu: 0.25%, Nb: 0.083%, Als: 0.035%, Ni: 0.25%, Ca: 0.007%, the rest is Fe and residual trace elements , through (1) electric furnace or converter smelting; (2)) LF furnace refining; (3) RH vacuum degassing; (4) continuous casting; (5) billet heating furnace heating; (6) rolling; (7) Forging; (8) Prepared by quenching and tempering heat treatment.

[0054] A preparation method of corrosion-resistant mooring chain steel, comprising the steps of:

[0055] 1) Desulfurization of molten iron, and desulfurization by spraying magnesium powder, controlling the S≦0.01% in the hot metal leaving the station after desulfurization, and operating without leaving slag.

[0056] 2) Converter smelting: use top-bottom composite blowing, control the amount of non-steel added to account for 13% of the...

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Abstract

The invention discloses corrosion-resistant mooring chain steel and a preparation method thereof. The corrosion-resistant mooring chain steel comprises the following components in percentage by weight: 0.27-0.30% of C, 0.15-0.35% of Si, 0.6-1.2% of Mn, 0.8-1.0% of Cr, 0.2-0.5% of Mo, not greater than 0.015% of P, not greater than 0.005% of S, 0.001-0.003% of B, 0.03-0.05% of V, 0.3-0.4% of Ni, 0.1-0.25% of Cu, 0.060-0.083% of Nb, 0.025-0.035% of Als, 0.1-0.25% of Ni, 0.001-0.007% of Ca, and the balance of Fe and residual trace elements. The preparation method comprises the following steps of (1) performing smelting through an electric furnace or a converter; (2) performing refining with an LF furnace; (3) performing RH vacuum degassing; (4) performing continuous casting; (5) performing heating with a blank casting heating furnace; (6) performing rolling; (7) performing forging; and (8) performing quenching and tempering heat treatment and the like. The corrosion-resistant mooring chainsteel prepared by the preparation method disclosed by the invention is simple in technological process, industrialization is easy to realize, and the corrosion-resistant mooring chain steel is suitable for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of mooring chain steel production, and in particular relates to a corrosion-resistant mooring chain steel and a preparation method thereof. Background technique [0002] Mooring chain is an important part of ships and ocean engineering. It is a high-strength, high-tech product that is widely used in the mooring positioning of large ships. The service conditions are harsh, and they are immersed in seawater for a long time. Therefore, not only high strength and good toughness are required, but also good seawater corrosion resistance and wear resistance are required. Mooring chain steel is the raw material for making mooring chains, so its quality requirements are self-evident. [0003] When the mooring chain is used in the Dead Sea or other alkaline sea areas, it will face corrosion in an alkaline environment. At present, the research on the corrosion of mooring chain steel mainly focuses on acid seawater cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/54C22C38/46C22C38/42C22C38/48C22C38/06C21D8/00
CPCC21D8/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54Y02P10/20
Inventor 祁海祁辉德茅家银赵让荣
Owner 镇江宝海船舶五金有限公司
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