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Vl4-4l marine steel plate with good low temperature toughness and its manufacturing method

A low-temperature toughness technology for ships, applied to VL4-4L steel plates for ships with good low-temperature toughness and its manufacturing field, can solve problems such as difficult production, achieve low cost, reasonable design, and reduce energy consumption

Active Publication Date: 2022-07-22
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this kind of products are produced by TMCP process at home and abroad. In order to ensure the low temperature performance requirements, it is necessary to strictly control the heating temperature of the billet, the rolling temperature and the rapid cooling process after rolling, and the production is extremely difficult.

Method used

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  • Vl4-4l marine steel plate with good low temperature toughness and its manufacturing method
  • Vl4-4l marine steel plate with good low temperature toughness and its manufacturing method
  • Vl4-4l marine steel plate with good low temperature toughness and its manufacturing method

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Embodiment Construction

[0037] Specific embodiments are described below in conjunction with the accompanying drawings:

[0038] It can be seen from the metallographic structure of Example 1 that the VL4-4L marine steel plate with good low temperature toughness is basically ferrite + bainite structure after the TMCP process, and the original austenite and the finished steel plate are all It has clear grain boundaries and very small grains (among which the austenite grain size is 9.0 and the ferrite grain size is 11.0), which greatly improves the low temperature impact toughness of the VL4-4L marine steel plate with good low temperature toughness and high strength level.

[0039] The chemical composition of the VL4-4L marine steel plate with good low temperature toughness of the present invention is shown in Table 1, the billet smelting process parameters are shown in Table 2, the rolling method and cooling process of the steel plate are shown in Table 3, and the tensile and impact properties of the em...

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PUM

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Abstract

The invention discloses a VL4-4L steel plate for ships with good low temperature toughness and a manufacturing method thereof. C: 0.04%-0.09%; Si: 0.05%-0.14%; Mn: 1.10%-1.45%; S: ≤0.002%; P: ≤0.008%; Als: 0.015% to 0.045%; N: 0.003% to 0.015%; Nb: 0.01% to 0.03%; Cu: 0.05% to 0.15%; Cr: 0.05% to 0.20%; Ni: 0.25% ~0.50%; V: 0%~0.04%; Ti: 0.008%~0.014%; the balance is Fe and inevitable impurities. It can meet the technical requirements of marine steel plates in harsh and harsh environments.

Description

technical field [0001] The invention belongs to the field of steel material preparation, in particular to a VL4-4L marine steel plate with good low temperature toughness and a manufacturing method thereof. Background technique [0002] In recent years, the global demand for LPG energy has continued to grow, and the demand for LPG storage and transportation has become increasingly strong. The scale of LPG transport ships is constantly developing in the direction of large-scale. The large-scale development of VLGC puts forward higher requirements for the safety and stability of ships in service. Therefore, not only the requirements for ship design and construction process are more stringent, but also for the production and quality stability control belts of low-temperature steel plates required for shipbuilding. to great difficulty. [0003] C-Mn series low-temperature steel plates for LPG ships are mainly used for the construction of cargo tanks and surrounding hull structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C38/46C22C38/48C22C38/50C22C38/42C22C33/04C21D8/0205C21D8/0226C21D8/0263
Inventor 张鹏严玲王华韩鹏王东旭陈华李广龙王晓航李文斌齐祥羽
Owner ANGANG STEEL CO LTD
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