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Ultrahigh-strength structural steel board for ocean engineering and production method thereof

A marine engineering and ultra-high-strength technology, applied in the field of ultra-high-strength steel, can solve the problems of increasing the difficulty of manufacturing, not conducive to ensuring the shape of the steel plate, etc. Effect

Active Publication Date: 2012-02-01
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The invention patent with the publication number CN101781742A proposes a production method of 18-40mm thick E550. The production process is TMCP, and its thickness is up to 40mm, which is relatively thin. The final cooling temperature is 380-500°C, which is not conducive to ensuring the steel plate The shape of the plate increases the difficulty of manufacturing, and the patent does not involve welding and lamellar tear resistance

Method used

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  • Ultrahigh-strength structural steel board for ocean engineering and production method thereof
  • Ultrahigh-strength structural steel board for ocean engineering and production method thereof
  • Ultrahigh-strength structural steel board for ocean engineering and production method thereof

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Embodiment 1

[0032]The thickness of the ultra-high-strength marine engineering structural steel involved in this embodiment is 12mm, and its components and weight percentages are: C 0.054%, Si 0.18%, Mn 1.58%, P 0.008%, S0.0014%, Nb 0.048 %, Ti 0.014%, Ni 0.19%, Mo 0.14%, and the balance is Fe and unavoidable impurity elements. According to the chemical composition range of the present invention, a steel plate with a thickness of 12mm is produced on a wide and thick plate production line, the size of the blank is 250mm*1700mm*2700mm, and the size of the finished product is 12mm*2600mm*35000mm, which is generally hot-rolled and air-cooled after rolling. Heat treatment process: quenching temperature is 930°C, holding time is 15min, tempering temperature is 500°C, and the time in the furnace is 35min in the tempering stage. The performance of the steel plate is excellent. figure 1 It is the reduction regulation in the steel plate rolling process, with figure 2 And attached image 3 is the ...

Embodiment 2

[0037] The thickness of the ultra-high-strength marine engineering structural steel involved in this example is 50 mm, and its components and weight percentages are: C 0.074%, Si 0.19%, Mn 1.56%, P 0.01%, S 0.002%, Nb 0.02% , Ti 0.014%, V0.05%, Ni 0.34%, Cu 0.21%, Mo 0.34%, and the balance is Fe and unavoidable impurity elements. The billet size is 300mm*2000mm*2950mm, the steel plate size is 50mm*3000mm*11000mm, the starting rolling temperature in the rolling stage is 1006°C, the re-rolling temperature is 811°C, the final rolling temperature is 803°C, and the final cooling temperature is 515°C. The steel plate is in good shape after straightening. Heat treatment process: quenching temperature is 930°C, holding time is 30min, tempering temperature is 610°C, and the furnace time in the tempering stage is 150min. After heat treatment, the performance of the steel plate is excellent. Figure 4 50mm thick steel plate reduction procedures, attached Figure 5 And attached Figure...

Embodiment 3

[0042] The thickness of the ultra-high-strength marine engineering structural steel involved in this example is 80 mm, and its components and weight percentages are: C 0.095%, Si 0.20%, Mn 0.98%, P 0.008%, S 0.0014%, Nb 0.022% , Ti 0.013%, V 0.04%, Ni 0.69%, Cu 0.29%, Cr 0.6%, Mo 0.34%, B 0.0011%, Al 0.036%, and the balance is Fe and unavoidable impurity elements. The billet size is 300mm*2400mm*4100mm, the steel plate size is 80mm*2400mm*15000mm, the starting rolling temperature after controlled rolling is 845°C, the final rolling temperature is 816°C, the final cooling temperature is 680°C, and the cooling rate is 6°C / s. Heat treatment process: quenching temperature is 930°C, holding time is 30 minutes, tempering temperature is 660°C, and the furnace time in the tempering stage is 240 minutes. After heat treatment, the performance of the steel plate is excellent. attached Figure 7 80mm thick steel plate reduction procedures, attached Figure 8 And attached Figure 9 The ...

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Abstract

The invention relates to an ultrahigh-strength structural steel board for ocean engineering and a production method thereof, belonging to the technical field of ultrahigh-strength steel. A board blank comprises the following components: 0.05-0.13% of C, 0.1-0.4% of Si, 0.7-1.7% of Mn, 0.01-0.04% of Alt, 0.02-0.05% of Nb, 0-0.05% of V, 0.008-0.02% of Ti, 0-0.6% of Cr, 0.2-0.4% of Mo, 0.15-0.8% of Ni, 0-0.5% of Cu, 0-0.0011% of B, less than 0.01% of P, less than 0.005% of S, less than 0.0010% of O, less than 0.005% of N, less than 0.00015% of H, and the balance of Fe and inevitable impurities, wherein Nb+V+Ti is not more than 0.12%. Aiming at different thickness standards, different chemical component as well as rolling and heat treatment process parameters are adopted. The production process comprises the steps of molten iron desulfurization, converter top and bottom blowing, vacuum treatment, continuous casting, controlled rolling and controlled cooling, quenching and tempering. The steel board has the advantages that: the production cost is lower, and the comprehensive mechanical properties can meet the requirements of the steel for the ocean engineering for various mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of ultra-high-strength steel, and in particular provides a steel plate for ultra-high-strength marine engineering structures and a production method thereof, and an ultra-high-strength marine engineering structure with excellent low-temperature toughness, welding performance and lamellar tear resistance Use steel. Background technique [0002] Ocean engineering structure is an important super-large welded steel structure for humans to develop ocean resources. It is used in severe ocean working environments such as waves, tides, storms, and cold drift ice to support platforms and drilling equipment with a total weight of more than hundreds of tons. These usage characteristics determine that the steel used for marine engineering structures must have high strength, high toughness, fatigue resistance, lamellar tear resistance, good weldability, and good cold workability and other performance indicators. This is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/50C22C38/58C22C33/04C21D8/02
Inventor 狄国标王彦锋麻庆申沈钦义杨永达姜中行杨春卫王文军王龙和张苏渊白学军何元春吴斌
Owner SHOUGANG CORPORATION
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