Hot-rolled steel plate for pressure vessel and manufacturing method thereof
A technology of hot-rolled steel plate and manufacturing method, which is applied in the field of hot-rolled steel plate for pressure vessels and its manufacturing, which can solve the problems of poor ductility, inability to form equiaxed ferrite, affect material, etc., and achieve the effect of excellent ductility
Inactive Publication Date: 2018-06-26
POHANG IRON & STEEL CO LTD
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- Summary
- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
This phase change process will be affected by temperature and time, so even with the same finishing exit temperature (FDT) and coiling temperature (CT), it will have different phases due to cooling mode, which will affect the material
Conventional hot rolling is continuously cooled to the coiling temperature after finishing rolling, so equiaxed ferrite cannot be formed, and there is a problem of poor ductility
Method used
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Embodiment
[0106]
[0107] In one embodiment of the present invention, the components of the slabs of the inventive steel and comparative steel manufactured as examples are shown in Table 1 above.
[0108] Then, the slab containing the composition in Table 1 was reheated at 1150° C. for 200 minutes.
[0109] After the rough rolling of the reheated steel slab, at the finishing temperature shown in Table 2 below (A 1 -20°C to A 1 +20°C) for finish rolling.
[0110] The plate of the finish rolling is cooled for the first time, and cooled to the intermediate temperature (A 2 -20°C to A 2 +20°C). After reaching the intermediate temperature, the second cooling is carried out at a rate of 5° C. / s, and the cooling time is 5 seconds.
[0111] The cooled plate is cooled to the coiling temperature (A 3 -20°C to A 3 +20°C) and then coiled to obtain a hot-rolled steel sheet.
[0112] [Table 2]
[0113]
[0114] [table 3]
[0115]
[0116] Hot-rolled steel sheets were manufactured u...
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Abstract
The present invention relates to a hot-rolled steel sheet for a pressure container and a manufacturing method thereof. More specifically, an embodiment of the present invention provides a hot-rolled steel sheet for a pressure container comprising: 0.1-0.2 wt% of C; 0.5 wt% or less of Si (exclusive for 0 wt%), 0.5-1.5 wt% of Mn; 0.03 wt% or less of P (exclusive for 0 wt%), 0.015 wt% or less of S (exclusive for 0 wt%),.05 wt% or less of Al (exclusive for 0 wt%), 0.01 wt% or less of N (exclusive for 0 wt%); and the remainder consisting of Fe and inevitable impurities, with respect to 100 wt% of the hot-rolled steel. The hot-rolled steel sheet is composed of perlite and ferrite fine structures. The volume fraction of the ferrite fine structure is 75-85% with respect to the 100% by fraction of the fine structures of the hot-rolled steel sheet. An aspect ratio of the ferrite fine structures is 0.7-1.3.
Description
technical field [0001] The invention relates to a hot-rolled steel plate for a pressure vessel and a manufacturing method thereof. More specifically, the present invention relates to a hot-rolled steel sheet for pressure vessels excellent in strength and ductility, and a method for producing the same. Background technique [0002] For pressure vessels such as liquefied gas vessels, the burst pressure in a burst test based on hydraulic pressure after fabrication of the container is very important. Therefore, the strength of the hot-rolled steel sheet used at this time is an important variable. For this reason, C, Si, Mn, Ti, Nb, Mo and V are usually added to the high-purity steel with the lowest impurity content in the steel, so that the hot-rolled steel plate used to make the container has high strength. [0003] At present, in order to manufacture high-strength hot-rolled steel sheets, Ti, Nb, V, Mo, etc. are added to make use of the precipitation strengthening of these e...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02
CPCC21D8/0226C21D8/0247C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06
Inventor 金勇佑张堤旭
Owner POHANG IRON & STEEL CO LTD