Ultrahigh-strength steel sheet having excellent yield ratio, and manufacturing method therefor
A technology of ultra-high strength and manufacturing method, applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve the problems of high yield strength and tensile strength, heat treatment and process cost increase, high investment cost, etc., to achieve high yield strength and Tensile strength, suppression of CO2 production, effect of protecting the global environment
Active Publication Date: 2019-06-21
浦项股份有限公司 +1
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Problems solved by technology
However, equipment investment costs are too high, and heat treatment and process costs increase, so it is necessary to develop cheaper materials that can be cold-formed
[0007] In addition, in order to replace hot press forming (Hot Press Forming) parts, high yield strength and tensile strength are required. The invention steel of Patent Document 2 has high hole expandability and can be cold press formed, but the yield ratio is less than 0.7, which is poor. And the tensile strength is also as low as 1000MPa, so it is not suitable as an alternative material for hot press forming (Hot Press Forming)
Method used
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[0088] Hereinafter, the present invention will be described more specifically by way of examples. However, it should be noted that the following examples are only for illustrating the present invention for more detailed description, and do not limit the scope of rights of the present invention. This is because the scope of rights of the present invention is determined by the content described in the claims and the content reasonably inferred therefrom.
[0089] After vacuum smelting steel having the composition of Table 1 below into a 30 kg ingot, it was held at a temperature of 1200° C. for 1 hour, and then hot rolled to complete finish rolling at 900° C. Furnace cooling was carried out after 1 hour in the furnace to simulate hot rolling coiling. Then, after cold rolling at a reduction ratio of 50%, annealing was performed at 900° C., and cooled to the cooling termination temperature described in Table 2 below, and then at the reheating temperature described in Table 2 below...
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Abstract
One aspect of the present invention relates to an ultrahigh-strength steel sheet having an excellent yield ratio, comprising, by wt%, 0.3-0.5% of C, 2.0% (excluding 0%) of Si, 3.0-6.5% of Mn, 0.02% orless of P, 0.01% or less of S, 0.01-3.0% of Al, 0.02% or less (excluding 0%) of N, and the balance of Fe and other inevitable impurities, and a microstructure comprises 5-30% of remaining austenite by area fraction and comprises 5% or less of secondary martensite.
Description
technical field [0001] The present invention relates to an ultra-high-strength steel plate excellent in yield ratio and a manufacturing method thereof. Background technique [0002] CO for progressively reinforced cars 2 For emission control and improvement of fuel efficiency, automobile manufacturers continue to require the weight reduction of vehicle bodies. In order to reduce the weight of automobile steel sheets, it is necessary to reduce the thickness of the steel sheets, and on the other hand, to ensure the safety of collisions, it is necessary to increase the thickness of the steel sheets, so there is a conflict between them. [0003] In order to solve the above contradictory aspects, it is necessary to improve the formability while increasing the strength of the material. It is known that this can be achieved by using Dual Phase Steel (Dual Phase Steel, hereinafter referred to as DP steel) as Advanced High Strength Steel (AHSS). ), transformation induced plasticity...
Claims
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IPC IPC(8): C22C38/04C22C38/38C22C38/02C22C38/06C22C38/00C22C38/12C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0263C21D2211/001C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/38C22C38/26C23C2/06C23C2/40C21D9/46C21D6/005C23C2/28C23C2/0224C21D6/002C21D6/008C21D8/0205C21D8/0278C21D2211/002C21D2211/005C22C38/002
Inventor李世雄布鲁诺·C·德库曼李圭荣徐夽颋李仙种柳朱炫李源辉
Owner浦项股份有限公司