High strength steel sheet having excellent cryogenic temperature toughness and low yield ratio properties, and method for manufacturing same
A high-strength steel plate and steel plate technology, applied in the field of high-strength steel plate and its preparation, can solve the problems of increased yield strength, limited time, difficulty in achieving low yield ratio, etc., and achieve the effect of excellent toughness
Active Publication Date: 2015-09-02
浦项股份有限公司
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Problems solved by technology
[0010] However, in the technology disclosed above, in the rolling process of the main process of preparing steel, a large amount of reduction (large reduction) is required each time, and the time for each time is limited. Difficult technologies. In order to realize these technologies, it is actually necessary to install super-large rolling equipment and control systems, so it is difficult to realize them with existing equipment.
[0011] The above-mentioned technologies are all technologies for improving strength and toughness based on the refinement of crystal grains. When the ferrite grains are refined in this way, the yield strength is also increased while the tensile strength is increased. Therefore, it is difficult to achieve low yield ratio problem
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[0082] Steel materials having the composition listed in the following Table 1 were made into slabs (Slabs), and each slab was reheated at 1000-1200°C, and then compressed in a single pass at 1200°C-Tnr. After rough rolling at a cumulative reduction ratio of 15% or more and a cumulative reduction ratio of 30% or more, finish rolling and cooling were performed according to the rolling and cooling conditions shown in Table 2 below to obtain steel sheets.
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Abstract
The present invention relates to a high strength steel sheet having low yield ratio properties and excellent cryogenic temperature toughness and thus is suitable to be applied to the steel material for a gas tank used for the storage of gas or the like. To this end, the present invention may optimize not only the component composition of the steel material but also a manufacture condition, thus providing a high strength steel sheet suitable for the steel material for a gas tank.
Description
technical field [0001] The present invention relates to a high-strength steel plate having low yield characteristics and excellent ultra-low temperature toughness, which is suitable for steel materials for gas tanks (Gas Tank) for storing gas and the like, and a method for producing the same. Background technique [0002] With the strengthening of environmental regulations caused by global warming, the CO 2 There is growing interest in the treatment of , where storage and transfer of CO 2 , so as to store it in the industry in the offshore oil field extraction area. Thus, for liquefaction and storage of CO 2 The demand for steel for gas tanks is increasing rapidly. [0003] In order to convert the CO 2 For gas liquefaction, a pressurization of at least 7 bar is required, due to the liquefaction of CO 2 The design temperature of the gas tank is below -60°C, so the steel used for the gas tank needs to have high strength characteristics to be able to withstand high pressur...
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IPC IPC(8): C22C38/00C21D8/02C21D9/46C22C38/58
CPCC22C38/58C22C38/02C21D9/46C22C38/20C22C38/12C22C38/04C22C38/00C21D8/0205C22C38/14C22C38/08C22C38/06C22C38/16C21D8/0263C21D6/001C21D6/005C21D6/008C22C38/50C21D2211/008C21D2211/005
Inventor 张成豪金佑谦房基铉
Owner 浦项股份有限公司