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Superhigh-strength high-toughness steel plate for ocean engineering and production method thereof

A technology of marine engineering and production methods, applied in the field of steel, can solve the problems of low strength and achieve the effects of excellent low-temperature toughness, stable production process, and fine grains

Active Publication Date: 2013-01-02
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the strength is low, the yield strength is between 360~370 MPa

Method used

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  • Superhigh-strength high-toughness steel plate for ocean engineering and production method thereof
  • Superhigh-strength high-toughness steel plate for ocean engineering and production method thereof
  • Superhigh-strength high-toughness steel plate for ocean engineering and production method thereof

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Embodiment Construction

[0036] According to the production process of the present invention, a total of two furnaces are smelted, and the smelting process is molten iron pretreatment → converter smelting → LF furnace refining → RH vacuum treatment → continuous casting machine continuous casting → billet stacking and slow cooling → billet inspection → casting Billet judgment → casting billet acceptance. After desulfurization treatment, the carbon content in the molten iron is controlled to [S]≤0.002%. After blowing, the end-point temperatures of the converter are 1601 and 1620°C, respectively, and the LF temperatures are 1551 and 1569°C, respectively. The aluminum deoxidation method is used for deoxidation. The residence time in the LF furnace is 40-50 minutes. The atmosphere in the bag is controlled by micro positive pressure operation. RH vacuum treatment, the holding time is 30 minutes under the condition of high vacuum degree (≤5.0mbar). After the RH breaks the vacuum, the pure calcium wire is f...

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Abstract

The invention discloses a superhigh-strength high-toughness steel plate for ocean engineering and a manufacturing method thereof. The superhigh-strength high-toughness steel plate comprises the following chemical components in percentage by weight: 0.06-0.10% of C, 0.20-0.40% of Si, 1.10-1.65% of Mn, at most 0.010% of P, at most 0.0020% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.60-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.60% of Cu, 0.40-0.60% of Mo, 0.020-0.040% of Alt, and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting in a converter, rolling on a Steckel reversing mill, and finally carrying out hardening and tempering heat treatment by a TMCP (thermomechanical rolling process) technique. The steel plate has favorable properties: the tensile strength is 770-840 MPa, the yield strength is 710-800 MPa, the elongation percentage is 16-19%, the -40 DEG C low-temperature lateral impact and low-temperature ageing impact properties are greater than or equal to 90J, and the cold bending resistance is qualified; and thus, the steel plate has the advantages of ultrahigh strength, excellent low-temperature impact and low-temperature ageing impact properties, and stable production technique.

Description

technical field [0001] The invention belongs to the field of iron and steel, in particular to an ultra-high-strength and high-toughness steel plate for marine engineering and a production method thereof. Background technique [0002] The continuous development of human beings has depleted the non-renewable land resources, and the ocean has gradually become a treasure to meet the needs of all countries. Offshore oil and gas industry, marine tourism industry, modern marine fishery, and marine transportation industry have become the four pillar industries of the current marine economy, among which the offshore oil and gas industry is the largest marine industry in the world. As a supporting structure for offshore oil and gas drilling and production operations, marine engineering equipment has broad prospects and strong development momentum. The further development of marine engineering supporting facilities derived from the manufacture of marine engineering equipment will driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C21D8/02C21D1/25C21D1/18
Inventor 吴年春尹雨群刘朝霞崔强李恒坤车马俊
Owner NANJING IRON & STEEL CO LTD
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