Method for producing large-sized seamless pipeline tube

A technology of seamless line pipe and production method, which is used in metal rolling, manufacturing tools, guiding/positioning/aligning devices, etc., can solve the problem of poor inner and outer surface quality of products, inaccurate geometric dimensions, and low rate of tube blanks. problems, to achieve a large range of finished product specifications, to avoid uneven wall thickness, and to achieve a high degree of localization.

Inactive Publication Date: 2007-11-28
沈阳东方钢铁有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The obvious disadvantages of the above two production methods are: 1. Low growth rate of tube blanks; 2. Low production capacity; 3. Poor quality of inner and outer surfaces of products, and inaccurate geometric dimensions
However, the specifications of the above-mentioned units are at best a maximum diameter of 480mm and a wall thickness of 60mm, which mea

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The tube blank is loaded into the walking preheating furnace, and then enters the annular heating furnace after being preheated by the walking preheating furnace. The preheating energy in the walking preheating furnace comes from the high-temperature tail gas of the annular heating furnace. The tube billet is heated to 1050-1100°C by an annular heating furnace, and then it is taken out of the furnace for two-way heat centering by a two-way heat centering unit, and then enters a cone-roller piercer, in which the front of the piercer is equipped with a rotary feeding device, and the back of the piercer is topped. The rod rotates actively. The capillary tube enters five three-roll limited mandrel rolling mills with air reducers. Then, it enters the three-stand tube-off unit, cuts the head and tail with a hot saw after the tube is off, and then enters the fast chain bed. When producing large-scale seamless pipes, the capillary tube enters the reheating furnace through a fa...

Embodiment 2

[0028] The tube blank is loaded into the walking preheating furnace, and then enters the annular heating furnace after being preheated by the walking preheating furnace. The preheating energy in the walking preheating furnace comes from the high-temperature tail gas of the annular heating furnace. The tube billet is heated to 1100-1150°C by an annular heating furnace, and then it is taken out of the furnace through a two-way heat centering unit for two-way heat centering, and then enters a cone-roller piercer. Active rotation. The capillary tube enters five three-roll limited mandrel rolling mills with air reducers. Then, it enters the three-stand tube-off unit. After the tube is off, it cuts the head and tail with a hot saw, and then enters the fast chain bed. When producing small and medium-sized seamless pipes, the capillary pipe enters the reheating furnace for heating, and then undergoes tension reduction through 12-14 micro-tension reducing machines, and the reduced ste...

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PUM

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Abstract

The process of producing seamless steel pipe includes the following steps: heating the pipe blank to 1000-1200 deg.c in a rotating hearth furnace, bidirectional hot centering in a bidirectional hot centering set, piercing in a conic roll piercer with front rotating feeder and back rotating mandrel to obtain hollow billet, rolling in five sets of three-roller plug mill, extracting in a three-frame extracting mill, hot sawing to crop ends, passing through fast chain beam and walking beam, straightening in a multi-roll straightening machine, inspecting and packing. The present invention can produce seamless steel pipe product in different sizes, and has high production capacity, high product quality and other advantages.

Description

Technical field: [0001] This patent relates to a production method of a line pipe, especially a production method of a large seamless line pipe. technical background: [0002] For the production of large-diameter, thick-walled, and extra-thick-walled seamless steel pipes, the traditional methods are pipe jacking-extrusion method and Pilger method. The obvious disadvantages of the above two production methods are: 1. Low growth rate of tube blanks; 2. Low production capacity; 3. Poor quality of inner and outer surfaces of products, and inaccurate geometric dimensions. [0003] In the late 1960s, the Italians completed the MPM pipe rolling process (that is, the two-roll continuous pipe rolling process) and obtained a patent. This is the first process patent after the first continuous pipe rolling mill in the United States was put into production in 1890. Subsequently, by the beginning of this century, more than 20 sets of continuous rolling mills worldwide have been in produc...

Claims

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Application Information

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IPC IPC(8): B21B19/04B21B19/06B21B39/16B21B39/02
Inventor 邢国泰周久乐
Owner 沈阳东方钢铁有限公司
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