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Economical low-temperature structural steel plate for polar region and manufacturing method thereof

A technology for structural steel plates and manufacturing methods, which is applied in the field of economical low-temperature structural steel plates for polar regions and its manufacturing, can solve the problems of steel plate performance fluctuations, increased control difficulty, increased production costs, etc., achieve low-temperature toughness improvement, increase crack growth resistance, The effect of reducing the amount added

Active Publication Date: 2020-05-12
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, if too many precious alloy elements are added to the ultra-low temperature steel plate, it will inevitably increase the production cost; adding a process link will inevitably increase the difficulty of control and the performance fluctuation of the steel plate, and it will require supporting special equipment and face practical problems such as large energy consumption. Therefore, it is urgent to develop a process production method for economical low-temperature environment steel plates.

Method used

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  • Economical low-temperature structural steel plate for polar region and manufacturing method thereof
  • Economical low-temperature structural steel plate for polar region and manufacturing method thereof
  • Economical low-temperature structural steel plate for polar region and manufacturing method thereof

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Embodiment 1

[0023] According to chemical composition: C: 0.09%, Si: 0.34%, Mn: 1.37%, Nb: 0.045%, V: 0.038%, Ti0.018%, Als: 0.042%, Ni: 0.36%, P: 0.009%, S : 0.002%, CEV: 0.35%, the rest is Fe and unavoidable impurities smelted continuous casting slab. The cross-sectional size of the continuous casting slab obtained from the molten steel with qualified composition is 300×1820mm; after the hot continuous casting slab is cut into a fixed length, it is hoisted and stacked at a temperature of 750-700°C and slowly cooled for more than 3 days. The continuous casting slab is reheated, and the furnace time is controlled at 4.5 hours, and the furnace temperature is 1175°C. After coming out of the furnace, descale and enter the roughing mill for rolling. Rolling starts at 1056°C. The reduction ratios of the last two passes of this stage are controlled at 18.2 and 18.6% respectively, and the final final rolling temperature is guaranteed to be 1005°C. At this time, the rolling The thickness is 160mm...

Embodiment 2

[0025]According to chemical composition: C: 0.05%, Si: 0.17%, Mn: 1.28%, Nb: 0.026%, V: 0.024%, Ti0.022%, Als: 0.030%, Ni: 0.21%, P: 0.008%, S : 0.001%, CEV: 0.28%, the rest is Fe and unavoidable impurities smelted continuous casting slab. The cross-sectional size of the continuous casting slab obtained from molten steel with qualified composition is 250×2320mm; after the hot continuous casting slab is cut into a fixed length, it is hoisted and stacked at a temperature of 650-600°C and slowly cooled for more than 3 days. The continuous casting slab is reheated, and the furnace time is controlled for 4 hours, and the furnace temperature is 1145°C. After coming out of the furnace, descale and enter the roughing mill for rolling. The rolling starts at 1047°C. The reduction ratios of the last two passes of this stage are controlled at 16.7 and 17.1% respectively, and the final final rolling temperature is guaranteed to be 995°C. At this time, the rolled piece The thickness is 130...

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Abstract

The invention relates to an economical steel plate with the thickness reaching 80mm for polar region low-temperature environment and a production method thereof. The economical steel plate is preparedfrom the following components in percentage by weight: 0.04-0.10% of C, 0.15-0.40% of Si, 1.20-1.40% of Mn, 0.020-0.050% of Nb, 0.020-0.050% of V, 0.010-0.030% of Ti, 0.015-0.050% of Als, 0.10-0.40%of Ni, less than 0.010% of P, less than 0.003% of S, less than or equal to 0.40% of CEV, and the balance of Fe and inevitable impurities. Through the component design, by reasonably adjusting the relative content between each element and economically controlling Ni alloy elements beneficial to low-temperature toughness, by combining subsequent strengthening rolling and refined crystalline strengthening to remedy strength loss and improve core performance of a large-thickness steel plate, the whole thickness fracture surface of the obtained steel plate has high toughness, and the demands of polar region rigor application environment on high-performance steel are met.

Description

technical field [0001] The invention belongs to the field of low-temperature structural steel preparation, and in particular relates to an economical polar-use low-temperature structural steel plate and a manufacturing method thereof. Background technique [0002] In recent years, the Arctic and Antarctic oceans have become an important focus of Earth system and global affairs. Antarctica is rich in marine biological resources and is a potential giant "granary" for human beings. The opening of the Arctic shipping lanes and the development and utilization of resources are also changing the global trade and energy utilization patterns. Only by carrying out systematic on-site scientific research can we gain the right to speak in the polar regions and truly participate in polar governance. In order to support the Arctic and Antarctic scientific research missions, it is necessary to develop high-level professional icebreakers, polar self-icebreaking scientific research ships, po...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C21D8/02
CPCC21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 胡淑娥韩启彪周瑞成小龙高良豪侯东华李博
Owner SD STEEL RIZHAO CO LTD
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