Producing technique for steel pipe cool sizing

A production process and sizing technology, applied in the direction of metal rolling, etc., can solve problems such as difficulty in ensuring ellipticity, low yield, waste of manpower and material resources, etc., and achieve the effect of convenient operation, low equipment investment, and small footprint

Inactive Publication Date: 2007-12-12
TIANJIN PIPE GROUP CORP
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the strict requirements on the outer diameter and ovality of oil casing and line pipe, it is difficult to meet the standard requirements according to the conventional hot rolling process. It is difficult to guarantee its ovality, so the finished product rate is relatively low, which causes a great waste of manpower and material resources

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0015] The steel pipe cold sizing production process of the present invention will be described in detail below in conjunction with the examples.

[0016] The steel pipe cold sizing production process of the present invention is completed by the following processes: raw material selection process; cold sizing process; inspection process; sawing process.

[0017] in,

[0018] Raw material selection process: the raw material is selected from hot-rolled oil casing and line pipe. The outer diameter of the raw material pipe is only large or small during the rolling process. It is required that the outer diameter of the raw material pipe is larger than the upper limit of the standard size, (according to the material The thickness is related to the outer diameter), and the outer diameter is generally required to be 0-6mm larger than the upper limit of the standard size.

[0019] Cold sizing process: including three steps of roll design, roll adjustment, and sizing.

[0020] The des...

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PUM

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Abstract

The steel tube cold radius fixing comprises the procedures of selecting material with the outer radius of the material bigger than the upper limit of the standard, composed of the design, adjustment and radius calibration of the rolling hole, inspection, cutting and final product delivery. It completely solves the difficulty of low yield rate of oil sleeve tube. It is simple, high in productivity, adjusted by corresponding roller, relying on the hydraulic pushing force to form the rolling hole, to get to the shrink of radius, calibrating circle, and rectifying the tube with quick operation. It is energy economical. It requires small investment and land occupation, free from heating furnace and cold bed. The yield rate is high, precise in adjustment dimension, free from influence of thermal expansion.

Description

technical field [0001] The invention relates to a production process of an oil casing. In particular, it relates to a steel pipe cold sizing production process capable of accurately manufacturing large-diameter oil casing pipes and line pipes. Background technique [0002] At present, with the increase in the consumption of large-diameter oil casing pipes (over 300mm in outer diameter) and subsea line pipes, the technological requirements for the production of this variety of pipes are also getting higher and higher. Due to the strict requirements on the outer diameter and ovality of oil casing and line pipe, it is difficult to meet the standard requirements according to the conventional hot rolling process. It is difficult to guarantee its ovality, so the finished product rate is relatively low, which causes a great waste of manpower and material resources. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/10
Inventor 李东刘宏伟张培兰齐国明刘文华张健
Owner TIANJIN PIPE GROUP CORP
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