Process for manufacturing pipeline tube

A process method and line pipe technology are applied in the processing field of the production line pipe of seamless oil well steel pipe restraint continuous rolling unit, which can solve the problems of many steel pipe transportation processes, high production cost, low production rhythm, etc., and achieve surface scratches, etc. Reduced chance of defects in quality, reduced transportation process, improved production rhythm effect

Inactive Publication Date: 2009-05-13
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing manufacturing process of line pipe adopts the normalization-heat treatment process for rolling. The process is complicated, the production rhythm is low, the output is not high, and the production cost is high. Due to the complex process, there are many transportation processes for steel pipes. During the transportation process, There is a high probability of quality defects such as surface scratches

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Put the tube billet into a ring heating furnace for heating, preheat at 1030°C for 10 minutes, preheat at 1200°C for 15 minutes, heat at 1320°C for 20 minutes, and heat at 1310°C for 25 minutes. Soak at 1290°C for 25 minutes, and at a furnace temperature of 1280°C for 20 minutes. After being released from the furnace, the tube billet temperature is 1300°C. The tube billet after being released from the furnace is rolled into a piercing machine. Left and right; the perforated capillary is sprayed with borax antioxidant and reaches the mandrel for pre-threading. After the capillary is pre-threaded through the mandrel, the capillary is turned by the rotary arm to the rolling line of the continuous rolling mill for rolling. , The action cycle of the slewing arm is 26.28 seconds. After being rolled by the stripping machine, the blank tube is separated from the mandrel, and the blank tube goes to the next process to ensure that the temperature of the blank tube leavi...

Embodiment 2

[0015] Example 2: put the tube billet into a ring heating furnace for heating, preheat at 1120°C for 10 minutes, preheat at 1270°C for 15 minutes, heat at 1310°C for 20 minutes, and heat at 1315°C for 25 minutes. Soak at 1300°C for 25 minutes, and at a furnace temperature of 1290°C for 20 minutes. After being released from the furnace, the tube billet temperature is 1300°C. The tube billet after being released from the furnace enters the piercing machine for rolling, and the solid tube billet becomes a capillary tube after being pierced. Left and right; the perforated capillary is sprayed with borax antioxidant and reaches the mandrel for pre-threading. After the capillary is pre-threaded through the mandrel, the capillary is turned by the rotary arm to the rolling line of the continuous rolling mill for rolling. , The action cycle of the slewing arm is 26.28 seconds. After being rolled by the stripping machine, the blank tube is separated from the mandrel, and the blank tube g...

Embodiment 3

[0016] Example 3: put the tube billet into a ring heating furnace for heating, preheat at a furnace temperature of 1080°C for 10 minutes, preheat at a furnace temperature of 1240°C for 15 minutes, heat at a furnace temperature of 1310°C for 20 minutes, and heat at a furnace temperature of 1320°C for 25 minutes. Soak at 1280°C for 25 minutes, and at a furnace temperature of 1300°C for 20 minutes. After being released from the furnace, the temperature of the tube blank is 1300°C. The tube blank that comes out of the furnace enters the piercing machine for rolling, and the solid tube blank becomes a capillary tube after being pierced. The temperature at this time is 1200°C Left and right; the perforated capillary is sprayed with borax antioxidant and reaches the mandrel for pre-threading. After the capillary is pre-threaded through the mandrel, the capillary is turned by the rotary arm to the rolling line of the continuous rolling mill for rolling. , The action cycle of the slewin...

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PUM

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Abstract

The invention provides a technique for producing a line pipe, which has the advantages of simple process, production rate and yield increases, production cost reduction, and low occurrence probability of quality defect such as surface scratching owing to simple process and less transportation procedures of steel pipes. The technique comprises steps as follows: heating, punching holes, cooling, rolling continuously, processing with an extracting mill, rolling with an expanding and reducing mill, and cooling. The process is characterized in that a pierced billet is placed in a bypath roller for cooling after being processed with the extracting mill and before being rolled with the expanding and reducing mill, and cooled; and the pierced billet slowly moves on the bypath roller way to radiate heat so as to be completely cooled in the air, thereby ensuring that the temperature of the pierced billet is reduced from 1,050 DEG C to 900 DEG C before being delivered for rolling with the expanding and reducing mill and a sizing mill.

Description

(1) Technical field [0001] The invention relates to a processing method for producing line pipes in a restraint continuous rolling mill for seamless oil well steel pipes, in particular to a process method for manufacturing line pipes. (2) Background technology [0002] The existing manufacturing process of line pipe adopts the normalization-heat treatment process for rolling. The process is complicated, the production rhythm is low, the output is not high, and the production cost is high. Due to the complex process, there are many transportation processes for steel pipes. During the transportation process, The probability of quality defects such as surface scratches is high. (3) Contents of the invention [0003] In view of the above problems, the present invention provides a process method for manufacturing line pipe, which has a simple process, improves the production rhythm, improves the output, and reduces the production cost. Due to the simple process, the transportat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B23/00B21B37/74B21B37/78C21D9/70C21D11/00
CPCY02P10/20
Inventor 宋箭平许彦万立波
Owner WUXI SEAMLESS OIL PIPE
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