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Manufacturing method of high alloy seamless steel tube

A technology of seamless steel pipe and manufacturing method, which is applied in the field of steel pipe manufacturing, can solve the problems of low metal yield, prone to infolding, and high cost, and achieve the effects of high metal yield, reduced iron scale, and low cost

Inactive Publication Date: 2010-08-25
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the extrusion process is the best deformation condition, because it has the characteristics of three-dimensional stress compression, which greatly exerts the plastic deformation of the metal, and is very suitable for the manufacture of high-end products such as alloy steel, stainless steel, and nickel-based alloys. The characteristics of its manufacturing process result in low metal yield, high cost and only few local applications
Other processes are used in small quantities to produce high-alloy seamless steel pipes, mainly because defects such as infolding and cracks are prone to occur during the piercing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The manufacturing method of this high-alloy seamless steel pipe adopts the following process steps:

[0025] 1. Adopt conventional centrifugal casting technology to produce high-alloy hollow billets.

[0026] 2. The inner and outer surfaces and end faces of the hollow tube are machined. Since the outer surface of the hollow tube blank after centrifugal casting forms a uniform thorn shape, there is a thin slag layer on the inner surface, and there are more slag inclusions within 30-50 mm from both ends of the tube blank. Therefore, first use a band saw to remove the ends of 30-50 mm at both ends; then use the method of external car internal boring to remove 3 mm on each side of the inner and outer sides; after machining, samples will be taken for performance inspection and overall flaw detection. Wherein, the distance between the sawn-off ends can be judged according to the amount of slag inclusions. In this embodiment, 40mm ends are sawed off.

[0027] 3...

Embodiment 2

[0033] Embodiment 2: The manufacturing method of this high-alloy seamless steel pipe adopts the following process steps:

[0034] 1. Adopt conventional centrifugal casting technology to produce high-alloy hollow billets.

[0035] 2. The inner and outer surfaces and end faces of the hollow tube are machined. First, use a band saw to remove the ends of 30 at both ends; then use the method of external lathing and internal boring to process and remove 3 mm on each side of the inner and outer sides; after machining, samples will be taken for performance inspection and overall flaw detection.

[0036] 3. The surface of the processed hollow tube is cleaned with a cleaning solution and air-dried, and then 6g of carbon powder is sprinkled on the inner surface of the tube as a reducing agent, and finally the holes at both ends of the hollow tube are sealed with high-temperature asbestos.

[0037] 4. Put the hollow tube billet into the annular heating furnace with a preheating temperatu...

Embodiment 3

[0042] Embodiment 3: The manufacturing method of this high-alloy seamless steel pipe adopts the following process steps:

[0043] 1. Adopt conventional centrifugal casting technology to produce high-alloy hollow billets.

[0044] 2. The inner and outer surfaces and end faces of the hollow tube are machined. First, use a band saw to remove the 50mm ends at both ends; then use the method of external lathing and internal boring to remove 3mm on each side of the inner and outer sides; after machining, samples will be taken for performance inspection and overall flaw detection.

[0045] 3. The surface of the processed hollow tube blank is cleaned with a cleaning solution, air-dried, and then 2g of carbon powder is sprinkled on the inner surface of the tube blank as a reducing agent. Finally, high-temperature asbestos is used to seal the holes at both ends of the hollow tube blank.

[0046] 4. Put the hollow tube billet into the annular heating furnace with a preheating temperature...

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Abstract

The invention discloses a manufacturing method of high alloy seamless steel tube, comprising the following technical steps: (1) producing a high alloy hollow shell with centrifugal casting technology; (2) heating the hollow shell and plugging the opening of the hollow shell when heating; (3) reaming and wall thinning for the hollow shell after being heated by using a perforating machine so as to form a blank; (4) tube rolling for the bland by using a pipe and tube mill so as to form a pierced billet; (5) sizing and reducing for the pierced billet by using a sizing and reducing machine so as to obtain the high alloy seamless steel tube. The blank with the manufacturing method uses centrifugal casting for the hollow shell and lubricant is added by using the characteristic of hollow shell, thereby avoiding the problems of high alloy material in the technologies of forging, rolling and punching such as low metal yield and high rejection rate due to difficult deformation, thereby greatly reducing the manufacturing cost.

Description

technical field [0001] The invention relates to a method for manufacturing steel pipes, in particular to a method for manufacturing high-alloy seamless steel pipes. Background technique [0002] The existing manufacturing technology is: there are many manufacturing processes for high-alloy seamless steel pipes, including periodic rolling process, jacking process, extrusion process, continuous rolling process, skew rolling process, etc. The general process is to use billet rolling or forging A method of piercing and drawing rolling as a raw material. [0003] Analysis of existing technical conditions: From the perspective of deformation characteristics, all processes can produce high-alloy seamless steel pipes. Among them, the extrusion process is the best deformation condition, because it has the characteristics of three-dimensional stress compression, which greatly exerts the plastic deformation of the metal, and is very suitable for the manufacture of high-end products su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 庞于思王黎晖陈建波申勇石冠斌刘静霍学义
Owner XINXING DUCTILE IRON PIPES CO LTD
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