An economical low-temperature structural steel plate for polar regions and its manufacturing method

A structural steel plate and a manufacturing method technology, which are applied in the economical polar low-temperature structural steel plate and its manufacturing field, can solve the problems of increased control difficulty, increased production cost, fluctuation of steel plate performance, etc., so as to increase crack propagation resistance, ensure safe use, Low temperature toughness improvement effect

Active Publication Date: 2021-11-23
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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  • An economical low-temperature structural steel plate for polar regions and its manufacturing method
  • An economical low-temperature structural steel plate for polar regions and its manufacturing method
  • An economical low-temperature structural steel plate for polar regions and its manufacturing method

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Effect test

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 present invention relates to an economical steel plate for polar low temperature environment with a thickness of 80 mm and a production method thereof. %, Nb: 0.020‑0.050%, V: 0.020‑0.050%, Ti: 0.010‑0.030%, Als: 0.015‑0.050%, Ni: 0.10‑0.40%, P<0.010%, S<0.003%, CEV≤0.40 %, and the rest are Fe and inevitable impurities. In the composition design of the invention, the relative content of each element is reasonably adjusted and the Ni alloy element beneficial to low temperature toughness is economically controlled, and the strength loss is compensated by the subsequent strengthening rolling and grain refinement strengthening, and the performance of the core part of the large-thickness steel plate is improved. The entire thickness of the steel plate has high strength and toughness, and meets the needs of high-performance steel in polar harsh application environments.

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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Patent Type & Authority Patents(China)
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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