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355MPa thick steel plate with low-temperature toughness and preparation method thereof

A low-temperature toughness, thick steel plate technology, applied in the field of steel material production, can solve the problems of prolonging the production cycle and improving, and achieve the effects of reducing the rolling temperature, optimizing the cooling process, and high-toughness welding performance

Inactive Publication Date: 2015-11-18
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the thick steel plate with low temperature impact toughness generally adopts normalizing process and adds a certain amount of nickel element, which greatly increases the production cost of the steel plate and prolongs the production cycle, such as -40 ℃ impact toughness is required The 16MnDR steel plate adopts the normalizing process, and a certain content of nickel must be added to the thick gauge steel plate, while the 09MnNiDR steel plate that guarantees -70°C requires normalizing, and at the same time, all thickness steel plates must add about 0.5% nickel

Method used

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  • 355MPa thick steel plate with low-temperature toughness and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The 355MPa grade low temperature toughness thick steel plate is composed of the following components by weight percentage: C: 0.09%, Si: 0.22%,

[0021] Mn: 1.47%, P0.012%, S0.003%, Nb: 0.041%, V: 0.042%, Ti: 0.016%, the balance Fe and unavoidable impurities. The final structure of the thick steel plate is characterized by quasi-polygonal ferrite and a small amount of pearlite.

[0022] The thickness of the steel plate is 55mm.

[0023] The preparation method of the 355MPa grade low temperature toughness thick steel plate comprises the following steps:

[0024] (1) Smelting process: Top-bottom combined blowing converter smelting, molten iron desulfurization ≤ 0.003%; strictly control the P content of molten iron, use high-quality scrap steel, LF refining adopts white slag operation, the chemical composition of molten steel is controlled according to the target value, ferro-titanium in LF Join later. RH refining pure degassing time ≥ 6 minutes; soft blowing after 250R...

Embodiment 2

[0028] The 355MPa low temperature toughness thick steel plate is composed of the following components by weight percentage: C: 0.10%, Si: 0.34%,

[0029] Mn: 1.42%, P0.013%, S0.002%, Nb0.031%, V: 0.039%, Ti: 0.013%, the balance Fe and unavoidable impurities. The final structure of the thick steel plate is characterized by quasi-polygonal ferrite and a small amount of pearlite.

[0030] The thickness of the steel plate is 40mm.

[0031] The preparation method of the 355MPa grade low temperature toughness thick steel plate comprises the following steps:

[0032] (1) Smelting process: Top-bottom combined blowing converter smelting, molten iron desulfurization ≤ 0.003%; strictly control the P content of molten iron, use high-quality scrap steel, LF refining adopts white slag operation, the chemical composition of molten steel is controlled according to the target value, ferro-titanium in LF Join later. RH refining pure degassing time ≥ 6 minutes; soft blowing after 250RH degass...

Embodiment 3

[0036] The 355MPa low temperature toughness thick steel plate is composed of the following components by weight percentage: C: 0.08%, Si: 0.41%,

[0037] Mn: 1.49%, P0.014%, S0.003%, Nb0.043%, V: 0.041%, Ti: 0.014%, the balance Fe and unavoidable impurities. The final structure of the thick steel plate is characterized by quasi-polygonal ferrite and a small amount of pearlite.

[0038] The thickness of the steel plate is 60mm.

[0039] The preparation method of the 355MPa grade low temperature toughness thick steel plate comprises the following steps:

[0040] (1) Smelting process: Top-bottom combined blowing converter smelting, molten iron desulfurization ≤ 0.003%; strictly control the P content of molten iron, use high-quality scrap steel, LF refining adopts white slag operation, the chemical composition of molten steel is controlled according to the target value, ferro-titanium in LF Join later. RH refining pure degassing time ≥ 6 minutes; soft blowing after 250RH degass...

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Abstract

The invention belongs to the technical field of steel material production, and particularly relates to a 355MPa thick steel plate with low-temperature toughness and a preparation method thereof. The 355MPa thick steel plate with the low-temperature toughness is composed of the following components according weight percent: 0.04 to 0.14% of C, 0.2 to 0.5% of Si, 1.0 to 1.6% of Mn, less than 0.018% of P, less than 0.005% of S, 0.015 to 0.045% of Nb, 0.02 to 0.05% of V, 0.008 to 0.020% of Ti, and the balance of Fe and inevitable impurities. The thick steel plate has good low-temperature (-60 DEG C) impact toughness, and additionally, high strength, high toughness and good welding performance of the thick steel plate are achieved in the condition of the low-carbon content by adopting the preparation method.

Description

technical field [0001] The invention belongs to the technical field of steel material production, and in particular relates to a 355MPa low-temperature tough thick steel plate and a preparation method thereof. Background technique [0002] With the development of the national economy, there are more and more demands for ships navigating in low-temperature sea areas and containers for storage and transportation of low-temperature media. In order to ensure the safety of equipment, the requirement to use steel plates with excellent low-temperature impact toughness is also increasing year by year. The earth's climate is warming, and after the sea ice in the Arctic sea melts, the Arctic waterway is being developed. Compared with the Suez Canal waterway, ships from Asia to Europe passing through the Arctic seaway will shorten a longer distance and shorten the transportation time by more than 10 days , so the transportation cost will be greatly reduced, but the ships operating in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04
Inventor 徐洪庆刘晓东王焕洋李旺生李敏朱延山王南辉谢晖曹爱青
Owner SHANDONG IRON & STEEL CO LTD
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