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High-strength shipbuilding section and production method thereof

A technology of marine steel plate and production method, applied in the field of high-strength marine steel plate and its production, can solve the problems of increasing the production cost of high-strength marine steel plate, restricting high-strength marine steel plate, unable to realize mass production, etc., and achieves good welding performance and excellent welding performance. The effect of mechanical properties

Active Publication Date: 2008-05-14
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the types of high-strength marine steel plates produced in China are mainly A32, A36, D32, and D36 with relatively low quality requirements. The highest yield strength is 355Mpa, the tensile strength is 490Mpa, and the low-temperature impact toughness can only be guaranteed to -20°C. , the production process mostly adopts electric furnace smelting, and it needs to be delivered after normalizing heat treatment, which greatly increases the production cost of high-strength marine steel plates, and also delays the delivery date, seriously restricting the large-scale production of high-strength marine steel plates to meet market demand
As for the F40 variety that requires high strength and high toughness at the same time, China has not found a mature process, let alone mass production.

Method used

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  • High-strength shipbuilding section and production method thereof

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Effect test

Embodiment 1

[0028]Add molten iron and steel scrap during converter smelting, the ratio of molten iron and steel scrap is 85%-95% to 5%-15%; then add ferroalloy ferrosilicon: Si≥72.0%, Mn≤0.5%, S≤0.02%, P≤ 0.04%, C≤0.2%, Cr≤0.5%, iron balance; ferromanganese: Si≤1.5%, Mn≥78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron balance; titanium Iron: 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%, iron balance; niobium Iron: carbon ≤ 0.05%, niobium 60-70%, silicon ≤ 2%, aluminum ≤ 2.5%, iron balance; molybdenum ferro:: 55.0% ≤ Mo ≤ 65.0%, Si ≤ 1.5%, S ≤ 0.10%, P ≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron balance; nickel plate: nickel 99.9%~100%, impurity balance; the final addition ratio is listed as 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 rest of Fe is smelted by composite deoxidized alloy aluminum manganese ferroalloy. Refined in LF furnace, refining temperature: 1500-1650°C; composition fine-tuning, slagg...

Embodiment 2

[0030] Add molten iron and steel scrap during converter smelting, the ratio of molten iron and steel scrap is 85%-95% to 5%-15%; then add ferroalloy ferrosilicon: Si≥72.0%, Mn≤0.5%, S≤0.02%, P≤ 0.04%, C≤0.2%, Cr≤0.5%, iron balance; ferromanganese: Si≤1.5%, Mn≥78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron balance; titanium Iron: 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%, iron balance; niobium Iron: carbon≤0.05%, niobium 60-70%, silicon≤2%, aluminum≤2.5%, iron balance; molybdenum iron: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤ 0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron balance; ferrochromium: Cr≥60.0%, C≤2.0%, Si≤2.5%, P≤0.04%, S≤0.03%, iron balance; the final addition ratio is listed as Si≥35.00%, Al≥12.00%, Ba≥18.00%, Al+Ba≥30.00%, P≤0.05%, S≤0.10% composite deoxidized alloy silicon Aluminum barium is smelted, refined by LF furnace, refining temperature: 1500-1650°C; composition fine-tuning, slag deoxidation, refining time ≥ 35min, argon blo...

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Abstract

The invention discloses a high-strength marine steel plate and a production method thereof. The mass percentages of main chemical components of the high-strength marine steel plate are: carbon=0.05%-0.10%, silicon=0.30-0.50%, manganese=1.20%-1.60%, Phosphorus ≤ 0.02%, sulfur ≤ 0.010%, niobium = 0.02% ~ 0.05%, titanium = 0.008 ~ 0.02%, aluminum = 0.02% ~ 0.06%, nickel = 0.0 ~ 0.40%, chromium = 0 ~ 0.70%, molybdenum = 0 ~0.60%, copper=0~0.70%, vanadium=0.0~0.05%, nitrogen≤0.008%. The production process is: raw material preparation (1), converter smelting (2), LF refining (3), VD vacuum degassing (4), continuous casting (5), heating furnace heating (6), rough rolling (7), Finish rolling (8), AGC controlled cooling (9) and storage of finished products (10).

Description

technical field [0001] The invention relates to a special steel material and a smelting method thereof, in particular to a high-strength marine steel plate with good mechanical properties under low temperature conditions and a production method thereof. Background technique [0002] With the development of shipbuilding technology, ships are developing in the direction of large-scale, light-weight, high-speed, and the development of offshore oil and gas fields. The general-strength marine steel plate can no longer meet the needs of the hull, while the high-strength marine steel plate has the characteristics of high strength and high toughness. , fully adapt to the quality requirements of modern ships to be large-scale, light-weight, and high-speed. Therefore, the proportion of high-strength marine steel plates continues to increase. It is predicted that it will increase from the current 10% to about 30%. Therefore, the development of a series of high-strength steel plates Mar...

Claims

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Application Information

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IPC IPC(8): C22C38/00
Inventor 曹志强张爱兵罗登肖大恒吴清明李曲全
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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