Strip steel production method for improving shape uniformity of steel cup mouth of welded gas cylinder

Abstract

The present invention relates to a strip steel production method for improving the shape uniformity of the steel cup mouth of a welded gas cylinder, which aims to solve the defect of the poor shape of the close-up part of a welded gas cylinder after the steel welding and forming process in the prior art. The heating temperature for the continuous casting blanks of welded gas cylinders is 1160 DEG C to 1240 DEG C. The continuous casting blanks are thermally insulated at the above temperature for 40 minutes to 60 minutes. During the rolling process, the cooling rate for the laminar flow is controlled within 34.1 DEG / S to 92.8 DEG / S. The quantity of the laminar cooling water on the upper surface of the strip steel is 81% to 95% the quantity of the laminar cooling water on the lower surface of the strip steel in weight percentage. The quantity of the 0-120m laminar cooling water at the head part of the strip steel is 70% to 85% the normal quantity of water in weight percentage. The quantity of the 0-120m laminar cooling water at the tail part of the strip steel is 50% to 75% the normal quantity of water in weight percentage. The quantity of the laminar cooling water at the middle part of the strip steel is equal to the normal quantity of water. According to the invention, the entire steel strip coil of a welded gas cylinder is uniform in temperature distribution, larger in crystalline grain and smaller in phase-transformation difference. The uniformity of the mechanical property in every direction and the shape uniformity of the steel cup mouth of the welded gas cylinder after the machining process are improved.

Description

technical field [0001] The invention relates to a strip steel production method for improving the shape uniformity of the mouth of a welded bottle steel, and belongs to the technical field of metallurgical plate and strip rolling. Background technique [0002] HP295 is the brand with the largest amount of welded cylinder steel products and the most widely used. It is mainly used to manufacture household 10kg and 15kg liquefied petroleum gas cylinders, steel seamless gas cylinders and compressed natural gas cylinders for vehicles, etc. Usually, welded bottle steel is manufactured from strip steel raw materials into bottle bodies. The main production process is: hot-rolled raw steel coil uncoiling, flattening → punching discs → stamping and drawing the discs into half tanks → closing half tanks → closing Socket welding of closed and unclosed half tanks → heat treatment → pressure and leak detection → packaging. During the forming process, the deformation of the strip steel by...

AI Technical Summary

Problems solved by technology

During the forming process, the deformation of the strip steel by external force includes key processes such as blanking, drawing, and closing. In these three deformation processes, the shape of the closing position of the welded bottle steel after welding and forming often occurs. The unfavorable phenomenon, that is, the phenomenon of "uneven cup mouth", has brought great troubles to the manufacturers of welding bottle steel products and the majority of users; after analysis, the uneven mechanical properties of the hot-rolled strip steel and the low surface hardness of the strip steel are the reasons The main reason for the "cup rim"

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