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Cold drawing, cold rolling production method for high-accuracy weldless steel tube

A technology for seamless steel pipes and production methods, applied in the direction of high-frequency current welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of low weld strength, inability to eliminate weld traces, high production costs, etc., and achieve uniform wall thickness, The effect of low cost and high operation rate

Inactive Publication Date: 2008-02-27
李永立
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Problems solved by technology

[0016] The purpose of the present invention is to provide a cold-drawing and cold-rolling production method of high-precision seamless steel pipes to solve the problems of high production cost, inability to eliminate weld traces and low weld strength in the prior art

Method used

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  • Cold drawing, cold rolling production method for high-accuracy weldless steel tube

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Embodiment Construction

[0023] Referring to Fig. 1, the cold drawing and cold rolling process of the present invention include steps: trimming the edges of the raw material strip steel, round tube forming (the strip steel is formed into a round tube shape on a deformation machine), welding (after adopting a high-frequency welded pipe machine to weld and form round pipe), welding burr removal (to make the welded part flush with the pipe wall and smooth without steps), inspection, heating (heating temperature is 950°C±50°C, time 20-30 minutes), hammer head, pickling, phosphorus Saponification and saponification (lubricating layer), drawing or rolling with an inner mandrel (the welded pipe after heating, hammering, and lubrication is passed through the outer die and inner mandrel of the cold drawing machine or the roll and inner mandrel of the cold rolling mill The drawing or rolling of the core and the extrusion of the inner core make it reduce the diameter, wall and extend. Generally, the diameter redu...

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Abstract

The invention discloses a cold-drawing and cold-rolling manufacturing method of high-precision seamless steel pipe, which comprises the following steps: doing pipe formation procedure for the front part to cut edge of raw material steel, mould round tube, weld, remove the welded burr, detect the standard product to enter subsequent disposing procedure; doing back disposal procedure to heat, beat, wash through acid, phosphorized, saponify; rolling the mould with inner core; annealing; aligning; cutting head and tail; detecting flaw; bulging; testing; packing; storing. The invention saves energy and cost with simple operation and even wall thickness, which can replace common seamless steel pipe, low-middle pressure boiler pipe and steel pipe of the fluid completely.

Description

[0001] This application is a divisional application, the filing date of the original application is September 26, 2006, the application number is 200610152647.1, and the title of the invention is "Production Method of High Precision Seamless Steel Tube". technical field [0002] The invention relates to a production method of a seamless steel pipe, which is a method for producing a high-precision seamless steel pipe by using strip steel. Background technique [0003] The production method of existing seamless steel pipe mainly comprises hot rolling pipe production process, cold rolling, cold drawing production: [0004] The process and the seamless process of the welded pipe expansion force reducing machine have some shortcomings, which are described as follows: [0005] (1) Hot-rolled tube production process: mainly includes front processes such as surface treatment, cutting, centering, heating, and perforation, as well as rear processes such as tube rolling, leveling, sizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B23K13/00
Inventor 李永立
Owner 李永立
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