A method for manufacturing hot-rolled clad steel and hot-rolled clad steel
A technology of hot-rolled cladding and manufacturing method, applied in the field of hot-rolled clad steel, can solve the problems of inability to achieve metallurgical bonding, inability to produce clad steel, difficult to fit, etc.
Active Publication Date: 2021-05-18
TIANJIN NINGHE COUNTY LONGCHANG PROFILED ROLLING FACTORY
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Problems solved by technology
However, in actual manufacturing, it is difficult to achieve a real fit between the shell and the core material closed by the cold bending process (see figure 1 ), so that it is easy to generate cracks between the core material and the shell after the subsequent rolling process, and the metallurgical bonding at the interface cannot be achieved, and qualified clad steel cannot be produced
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[0030] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] Such as figure 1 and figure 2 As shown, it has been proved by experiments that the existing coating method cannot produce bars and profiles that can guarantee product quality. After analysis, the applicant believes that it is incorrect for the existing process to produce bar and profile stainless steel clad materials completely according to the idea of rolling clad stainless steel plates. The reason is that the steel billets of stainless steel clad steel plates are laminated with multi-layer plates, and the rolling force of stainless steel clad steel plates is a pair of up and down one-way multi-pass rolling, while the billets of clad steel profiles and bars It is a square, rectangular, round and other composite steel billets with closed outer layers. There are reverse rolling in the multiple rol...
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Abstract
The invention discloses a method for manufacturing hot-rolled composite steel, which comprises the following steps: (1) using carbon steel to prepare 1 The core material is made of stainless steel with an inner diameter of D 2 clad pipe, D 1 >D 2 ; (2) heat the coated pipe to temperature T 1 , so that the inner diameter D 2 expand to D 3 ,D 3 >D 1 , and then the core material and the heated cladding pipe are assembled together to obtain a composite billet; (3) the composite billet is heated to a temperature T 2 After rolling, the hot-rolled composite steel is obtained; the cladding pipe and the core material are always tightly combined during the process of heating and rolling. In the above manufacturing method, by designing the inner diameter of the clad pipe and the outer diameter of the core material, the inner diameter of the clad pipe is smaller than the outer diameter of the core material, and then the clad pipe is heated and combined with the core material to obtain a composite billet, and By making the clad pipe material and the core material tightly combined in the process of rolling after heating, cracks at the interface between the clad pipe material and the core material are avoided, so that qualified hot-rolled rods or hot-rolled profiles can be obtained.
Description
technical field [0001] The present invention relates to a method for manufacturing hot-rolled composite steel, in particular to a method for manufacturing hot-rolled composite steel in which the core material is carbon steel and the cladding material is stainless steel. The present invention also relates to the hot-rolled composite steel obtained by the above-mentioned manufacturing method . Background technique [0002] Stainless steel composite materials are usually made of stainless steel as the cladding material, plain carbon steel or ordinary low alloy steel as the base material, and composite materials are made by metallurgical bonding. This composite material has the advantages of corrosion resistance and rust resistance of stainless steel and high plasticity and low cost of ordinary steel, and has an incomparable price advantage over pure stainless steel of the same specification. Stainless steel clad plates and stainless steel clad pipes are two typical products in...
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IPC IPC(8): B21B1/16B21C37/04
CPCB21B1/16B21B2261/08B21C37/04
Inventor 刘嘉勋刘洪成
Owner TIANJIN NINGHE COUNTY LONGCHANG PROFILED ROLLING FACTORY