Super-thick steel plate with excellent performance and preparation method thereof
An extra-thick steel plate and excellent technology, applied in the field of extra-thick steel plate and its preparation, can solve the problems of poor uniformity of section hardness and poor mechanical properties of the core, and achieve the effect of improving the uniformity of properties in the thickness direction and the mechanical properties of the core
Active Publication Date: 2020-11-13
SHOUGANG CORPORATION
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Problems solved by technology
[0004] However, the existing extra-thick steel plates prepared by the method of producing extra-thick steel plates with composite billets have the technical problems of poor cross-sectional hardness uniformity and uniform mechanical properties, especially the poor mechanical properties of the core.
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preparation example Construction
[0036] In order to achieve the above purpose, an embodiment of the present invention provides a method for preparing an extra-thick steel plate with excellent performance, the preparation method comprising:
[0037] Obtain continuous casting slab;
[0038] Selecting two continuous casting slabs with a thickness ratio of 1:2 to 3, cleaning the surface to obtain two smooth continuous casting slabs;
[0039] The two smooth continuous casting slabs are vacuum stacked and packaged to obtain a composite slab;
[0040] Heating the composite blank to obtain a preheated composite blank;
[0041] Rough rolling and finish rolling of the preheated composite slab, the deformation zone coefficient of the rough rolling is ≥0.5, and then slow cooling to obtain the extra-thick steel plate with excellent properties.
[0042] During the long-term practice, the applicant found that the joint interface of the composite billet is the weak point of the performance of the composite plate. In additi...
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Abstract
The invention discloses a super-thick steel plate with the excellent performance and a preparation method thereof. The preparation method comprises the steps of obtaining continuous casting billets; selecting two continuous casting billets with the thickness ratio of 1:2-3, and conducting surface cleaning to obtain the two smooth continuous casting billets; conducting vacuum overlapping and packaging on the two smooth continuous casting billets to obtain a combined billet; heating the combined billet to obtain a preheated combined billet; and conducting rough rolling and precision rolling on the preheated combined billet and then conducting slow cooling to obtain the super-thick steel plate with the excellent performance, wherein the coefficient of a rough rolling deformation zone is greater than or equal to 0.5. According to the preparation method, the continuous casting billets at the asymmetric thickness ratio are creatively selected as raw materials; when the thickness ratio of thetwo continuous casting billets is 1:2-3, the two continuous casting billets are subjected to vacuum overlapping and packaging, heating and rolling, and the maximum hardness difference of the steel plate in the thickness direction reaches up to 3.2 HRC; and the difference values of the yield strength and tensile strength of the surface of the thickness direction of the steel plate, and the 1 / 4 position and the core portion of the steel plate are controlled within 35 MPa.
Description
technical field [0001] The invention relates to the technical field of steel preparation, in particular to an extra-thick steel plate with excellent performance and a preparation method thereof. Background technique [0002] At present, steel ingots obtained by die-casting are mainly used as raw materials for the production of extra-thick steel plates of 100-200mm, and the ingots are subsequently heated, billeted and rolled. Using this method to roll extra-thick steel plates can ensure a relatively large compression ratio, but there are also a series of problems, such as metallurgical defects such as segregation, shrinkage cavities, and shrinkage porosity in the interior of large-scale die-cast steel ingots. The extra-thick specification steel plate obtained after manufacturing is prone to problems such as unqualified flaw detection and poor performance uniformity. In addition, large-sized steel ingots take a long time to pour, consume a lot of energy, and often need to be ...
Claims
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IPC IPC(8): C21D8/02B21B1/38
CPCC21D8/0205C21D8/0226C21D8/0263B21B1/38B21B2001/386
Inventor 张海李少坡白学军顾林豪邹扬王志勇丁文华马长文
Owner SHOUGANG CORPORATION