VL4-4L ship steel plate with good low-temperature toughness and manufacturing method of VL4-4L ship steel plate
A technology of low temperature toughness and manufacturing method, which is applied to the VL4-4L marine steel plate with good low temperature toughness and its manufacturing field, can solve problems such as difficult production, and achieve the effects of low cost, reasonable design and reduced energy consumption.
Active Publication Date: 2021-07-23
ANGANG STEEL CO LTD
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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.
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[0037] Specific embodiments are described below in conjunction with accompanying drawing:
[0038] From the metallographic structure of Example 1, it can be seen that the VL4-4L steel plate for ships with good low-temperature toughness is basically ferrite + bainite structure after TMCP treatment, and the original austenite and finished steel plate structures are both With clear grain boundaries and very fine grains (among them, the austenite grain size is 9.0 and the ferrite grain size is 11.0), which greatly improves the low-temperature impact toughness and high level of strength.
[0039] The chemical composition of the VL4-4L steel plate for ships with good low-temperature toughness of the present invention is shown in Table 1, the technical parameters of steel billet smelting 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 example steel are shown in Table 4.
[0040] Table ...
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The invention discloses a VL4-4L ship steel plate with good low-temperature toughness and a manufacturing method of the VL4-4L ship steel plate. The VL4-4L ship steel plate is manufactured from the following chemical components in percentage by mass: 0.04% to 0.09% of C, 0.05% to 0.14% of Si, 1.10% to 1.45% of Mn, less than or equal to 0.002% of S, less than or equal to 0.008% of P, 0.015% to 0.045% of Als, 0.003% to 0.015% of N, 0.01% to 0.03% of Nb, 0.05% to 0.15% of Cu, 0.05% to 0.20% of Cr, 0.25% to 0.50% of Ni, 0%-0.04% of V, 0.008% to 0.014% of Ti, and the balance of Fe and inevitable impurities. The technical requirements of severe and harsh ocean environments on a marine steel plate can be met.
Description
technical field [0001] The invention belongs to the field of steel material preparation, in particular to a VL4-4L steel plate for ships 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 carriers 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 the production and quality stability control of low-temperature steel plates required for shipbuilding. come with great difficulty. [0003] For the C-Mn series low-temperature steel plates used in LPG ships, they are mainly used for the construction of liquid cargo tanks and surrou...
Claims
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Login to View More 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