Process for manufacturing pipeline tube

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

Inactive Publication Date: 2010-07-21
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 of 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 the ring heating furnace for heating, the furnace temperature is 1030°C, preheat for 10 minutes; the furnace temperature is 1200°C, preheat for 15 minutes; the furnace temperature is 1320°C, heat for 20 minutes; Minutes; furnace temperature 1290°C, soak for 25 minutes; furnace temperature 1280°C, soak for 20 minutes; after coming out of the furnace, the temperature of the tube billet is 1300°C; At this time, the temperature is about 1200°C; the perforated capillary is sprayed with borax antioxidant and reaches the mandrel for pre-threading. During the process, the action cycle of the fork and the rotary arm is 26.28 seconds. After being rolled by the stripping machine, the waste pipe is separated from the mandrel, and the waste pipe goes to the next process to ensure the temperature of the waste pipe when it leaves the exit of the stripping machine. The temperature is 1050°C; the empty pipe leaves the exit of the pipe stripping machin...

Embodiment 2

[0015] Example 2: Put the tube billet into the ring heating furnace for heating, the furnace temperature is 1120°C, preheat for 10 minutes; the furnace temperature is 1270°C, preheat for 15 minutes; the furnace temperature is 1310°C, heat for 20 minutes; Minutes; furnace temperature 1300°C, soaking for 25 minutes; furnace temperature 1290°C, soaking for 20 minutes; after being released from the furnace, the temperature of the tube billet is 1300°C; the discharged tube billet enters the piercing machine for rolling, and the solid billet becomes a capillary tube after being pierced At this time, the temperature is about 1200°C; the perforated capillary is sprayed with borax antioxidant and reaches the mandrel for pre-threading. During the process, the action cycle of the fork and the rotary arm is 26.28 seconds. After being rolled by the stripping machine, the waste pipe is separated from the mandrel, and the waste pipe goes to the next process to ensure the temperature of the wa...

Embodiment 3

[0016] Example 3: Put the tube billet into the ring heating furnace for heating, the furnace temperature is 1080°C, preheat for 10 minutes; the furnace temperature is 1240°C, preheat for 15 minutes; the furnace temperature is 1310°C, heat for 20 minutes; Minutes; furnace temperature 1280°C, soak for 25 minutes; furnace temperature 1300°C, soak for 20 minutes; after coming out of the furnace, the temperature of the tube billet is 1300°C; At this time, the temperature is about 1200°C; the perforated capillary is sprayed with borax antioxidant and reaches the mandrel for pre-threading. During the process, the action cycle of the fork and the rotary arm is 26.28 seconds. After being rolled by the stripping machine, the waste pipe is separated from the mandrel, and the waste pipe goes to the next process to ensure the temperature of the waste pipe when it leaves the exit of the stripping machine. The temperature is 1050°C; the empty pipe leaves the exit of the pipe stripping machin...

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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 forcooling 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 of 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 transportati...

Claims

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Application Information

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Patent Type & Authority Patents(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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