Q420R high-strength steel with thickness being 35-50mm for low-temperature pressure vessel and production method thereof
A Q420R, production method technology, applied in the field of medium and thick steel plate production, can solve the problems of wasting steel resources, increasing transportation costs, reducing the capacity of vehicle-mounted mobile containers, etc., achieving the effect of qualified internal flaw detection and minimized residual stress
Inactive Publication Date: 2018-06-15
NANYANG HANYE SPECIAL STEEL CO LTD
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Problems solved by technology
Before the new Q420R steel grade was added, Q370R was mainly used to make high-strength low-temperature container equipment in China. Due to the limited strength and low-temperature impact of Q370R (the highest strength is 630Mpa, and the impact energy at -20 is greater than or equal to 34J), in order to ensure the safety of mobile containers, It can only increase the thickness of the steel plate, which increases the weight of the mobile container itself, reduces the capacity of the vehicle-mounted mobile container, increases the transportation cost, and wastes precious steel resources
Method used
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[0020] The technical features of the present invention will be further described below in conjunction with the embodiments.
[0021] The embodiment of the present invention is to produce a kind of 35-50mm thick high-strength steel Q420R for low temperature mobile pressure vessel,
[0022] Contains the following chemical composition in mass percent (unit, wt%): C:0.13, Si:0.24, Mn:1.46, P:0.012, S:0.004, Als:0.032, V:0.056, Ti:0.003, Cr:0.220, Ni: 0.353, Nb: 0.026, CEV: 0.45, others are Fe and residual elements, through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF refining, VD refining, die casting, slow cooling of steel ingots, cleaning of steel ingots, heating, A 30-50mm Q420R steel plate was obtained by controlled rolling, stack cooling, heat treatment, and slow cooling process.
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Abstract
The invention discloses Q420R high-strength steel with the thickness being 35-50mm for a low-temperature movable pressure vessel. The Q420R high-strength steel comprises, by mass, 0.12%-0.15% of C, 0.20%-0.40% of Si, 1.45%-1.55% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30%-0.40% of Ni, 0.22%-0.27% of Cr, 0.020%-0.030% of Nb, 0.05%-0.06% of V, 0.015%-0.035% of Als, 0.008%-0.018% of Ti, 0.44%-0.49% ofCEV, and the balance Fe and residual elements, wherein the CEV is equal to C+Mn / 6+(Mo+V+Cr) / 5+(Ni+Cu) / 15. Compared with the prior art, the Q420R high-strength steel has the characteristics of being low in weight and safe. The self-weight of the manufactured movable vessel is not increased, and the vehicle-mounted movement capacity cannot be reduced.
Description
technical field [0001] The invention belongs to the technical field of production of medium-thick steel plates, and in particular relates to a high-strength steel Q420R for low-temperature mobile pressure vessels and a production method thereof. Background technique [0002] Q420R is a newly added steel type in the GB713-2014 standard. It has high strength and good low-temperature impact toughness. It is mainly used for making mobile pressure vessel tanks and other equipment. Before the new Q420R steel grade was added, Q370R was mainly used to make high-strength low-temperature container equipment in China. Due to the limited strength and low-temperature impact of Q370R (the highest strength is 630Mpa, and the impact energy at -20 is greater than or equal to 34J), in order to ensure the safety of mobile containers, It can only increase the thickness of the steel plate, which increases the weight of the mobile container itself, reduces the capacity of the vehicle-mounted mobi...
Claims
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Login to view more IPC IPC(8): C22C38/48C22C38/46C22C38/06C22C38/50C22C38/02C22C38/04C22C38/58C22C33/04C21C7/10C21C7/064C21C7/06C21D8/02
CPCC22C38/48C21C7/06C21C7/064C21C7/10C21D8/0205C21D8/0221C21D8/0247C22C33/04C22C38/02C22C38/04C22C38/06C22C38/46C22C38/50C22C38/58
Inventor 朱书成于飒许少普李忠波张涛李亮康文举唐郑磊刘庆波张占杰杨阳杨东庞百鸣董真真袁少威袁永旗袁继恒符可义朱先兴王英杰蒋鹏薛艳生石教兴
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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