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Production method of anti-corrosion and high strength ultra-thick steel plates

A production method and high-strength technology, applied in the field of steelmaking, can solve the problems of high production cost, unreachable performance, high energy consumption, etc., and achieve the effect of low production cost, short process and improved mechanical properties

Inactive Publication Date: 2010-12-22
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method can meet the requirements of compression ratio above 5.0, but the process is long, the energy consumption is high, the production cost is also high, and the performance cannot meet the ideal requirements.

Method used

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  • Production method of anti-corrosion and high strength ultra-thick steel plates
  • Production method of anti-corrosion and high strength ultra-thick steel plates
  • Production method of anti-corrosion and high strength ultra-thick steel plates

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Add molten iron and scrap steel during the converter smelting process, the ratio of molten iron and scrap steel is (85%~95%) / (5%~15%); copper plate, Cu95%~100%, impurity balance; then add ferroalloy Ferrosilicon, Si≥72.0%, Mn≤0.5%, S≤0.02%, P≤0.04%, C≤0.2%, Cr≤0.5%, Fe balance; Ferromanganese, Si≤1.5%, Mn≥78.0%, S≤0.03%, P≤0.20%, C≤1.5%, Fe balance; titanium ferro, 25.0%≤Ti≤35.0%, Al≤8.0%, Si≤4.50%, Mn≤2.50%, P≤0.05%, S≤0.03%, C≤0.10%, Cu≤0.40%, Fe balance; ferroniobium, C≤0.05%, Nb60~70%, Si≤2%, Al≤2.5%, Fe balance; nickel plate, Ni99 .9%~100%, impurity balance; the final addition ratio is Si≤2.0%, 30.0%≤Mn≤35.0%, S≤0.05%, P≤0.20%, C≤2.0%, 20.0%≤Al≤26.0% , Cu ≤ 0.5%, Fe balance composite deoxidized Al-Mn ferroalloy for smelting. After refining in LF furnace, the refining temperature is 1500~1650°C; the composition is fine-tuned, slag is deoxidized, the refining time is ≥35min, argon is blown and stirred throughout the process, and the basicity of the refin...

Embodiment 2

[0025]Embodiment 2: Add molten iron and steel scrap during converter smelting, the proportion of molten iron and steel scrap is (85%~95%) / (5%~15%); copper plate, Cu 95%~100%, impurity balance; then add Ferroalloy Ferrosilicon, Si≥72.0%, Mn≤0.5%, S≤0.02%, P≤0.04%, C≤0.2%, Cr≤0.5%, Fe balance; Ferromanganese, Si≤1.5%, Mn≥78.0% , S≤0.03%, P≤0.20%, C≤1.5%, Fe balance; ferro-titanium, 25.0%≤Ti≤35.0%, Al≤8.0%, Si≤4.50%, Mn≤2.50%, P≤0.05% , S≤0.03%, C≤0.10%, Cu≤0.40%, Fe balance; ferroniobium, C≤0.05%, Nb60~70%, SI≤2%, Al≤2.5%, Fe balance; nickel plate, Ni 99.9%~100%, impurity balance; the final addition ratio is Si≤2.0%, 30.0%≤Mn≤35.0%, S≤0.05%, P≤0.20%, C≤2.0%, 20.0%≤Al≤26.0% , Cu ≤ 0.5%, Fe balance composite deoxidized Al-Mn ferroalloy for smelting. After refining in LF furnace, the refining temperature is 1500~1650℃; the composition is fine-tuned, slag is deoxidized, the refining time is ≥35min, argon is blown and stirred throughout the process, and the basicity of the refined ...

Embodiment 3

[0030] Embodiment 3: Add molten iron and steel scrap during the converter smelting process, the proportion of molten iron and steel scrap is (85%~95%) / (5%~15%); copper plate, Cu 95%~100%, impurity balance; then add Ferroalloy ferrosilicon: Si≥72.0%, Mn≤0.5%, S≤0.02%, P≤0.04%, C≤0.2%, Cr≤0.5%, Fe balance; ferromanganese, Si≤1.5%, Mn≥78.0% , S≤0.03%, P≤0.20%, C≤1.5%, Fe balance; ferro-titanium, 25.0%≤Ti≤35.0%, Al≤8.0%, Si≤4.50%, Mn≤2.50%, P≤0.05% , S≤0.03%, C≤0.10%, Cu≤0.40%, Fe balance; ferroniobium, C≤0.05%, Nb 60~70%, Si≤2%, Al≤2.5%, Fe balance; nickel plate , Ni 99.9%~100%, impurity balance; the final addition ratio is Si≤2.0%, 30.0%≤Mn≤35.0%, S≤0.05%, P≤0.20%, C≤2.0%, 20.0%≤Al≤26.0 % , Cu ≤ 0.5%, the balance of Fe is smelted with composite deoxidized alloy Al-Mn-Fe. LF furnace refining, refining temperature, 1500~1650°C; composition fine-tuning, slagging deoxidation, refining time ≥ 35min, argon blowing and stirring throughout, refining slag alkalinity (CaO / SiO 2 ) = 5.0...

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Abstract

A production method of anti-corrosion and high strength ultra-thick steel plates comprises the process flows of (1) raw material preparing, (2) smelting in a converter, (3) LF refining, (4) vacuum degassing in a VD furnace, (5) continuous casting, (6) plate blank heating, (7) rough rolling, (8) finish rolling, (9) controlled rolling and cooling by ACC, (10) online normalizing, (11) finishing and (12) finished product warehousing. The method is characterized in that the steel comprises the following components by weight: 0.05-0.13% of C, 0.10-0.50% of Si, 0.6-1.60% of Mn, not more than 0.015% of P, not more than 0.005% of S, not more than 0.05% of Nb, not more than 0.02% of Ti, 0.02-0.06% of Al, not more than 0.60% of Ni, not more than 0.70% of Cu, not more than 0.1% of V, not more than 0.008% of N and the balance Fe and inevitable impurities. The steel plates produced by the method have high strength, high tenacity and anti-marine corrosion property.

Description

technical field [0001] The invention belongs to a steelmaking method, in particular to a method for producing an ultra-thick steel plate for a corrosion-resistant high-strength offshore oil drilling platform. technical background [0002] Offshore oil development technology is becoming more and more mature, and the requirements for steel are getting higher and higher. The structure of offshore oil platform is huge, complex and rigid. In addition to being eroded by seawater and marine climate in the ocean, it is also affected by complex alternating external forces such as wind, waves and tidal surges and submarine earthquakes. Its environmental conditions Since it is very different, it is extremely bad. Therefore, steels for offshore platforms are required to have sufficient strength, fracture toughness, weldability, and corrosion fatigue resistance, especially for thick plates to have lamellar tear resistance and uniformity of plate thickness in mechanical properties. [0...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C33/04C21D8/02
Inventor 罗登夏政海肖大恒吴清明李曲全李玲玲孙小平
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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