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Manufacturing method of N08028 seamless alloy steel pipe

A technology of seamless steel pipe and manufacturing method, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of high difficulty of mechanical drilling and reaming, waste of core materials, high scrap rate, etc., and achieves avoidance of internal and external surface defects, reduction of manufacturing costs, and good foundation conditional effect

Inactive Publication Date: 2013-12-18
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method not only causes waste of core materials, but also leads to low metal yield and finished product rate, and the difficulty of mechanical drilling and reaming is extremely high, thermal processing is difficult, and the scrap rate is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The manufacturing method of the N08028 alloy oil well pipe seamless steel pipe with an outer diameter of φ177.8mm and a wall thickness of 9.19mm comprises the following steps:

[0028] (1) Centrifugal casting: Centrifugal casting technology is used to produce N08028 alloy hollow tube blanks with an outer diameter of φ466mm, an inner diameter of φ210mm, and a length of 1500mm. The hollow tube blanks are quenched in water at a temperature greater than 950°C. After cooling, the hollow tube blanks are homogenized. The homogenization treatment temperature is 1050° C., and the temperature is kept for 12 hours. The outer surface of the centrifugally cast hollow billet will form a uniform thorn shape due to the coating, and there will be a thin slag layer on the inner surface due to the slag discharge effect of centrifugal force. It is necessary to machine the inner and outer surfaces of the hollow billet: The outer surface is processed 4mm on one side, and the inner surface is...

Embodiment 2

[0037] The manufacturing method of the N08028 alloy oil casing seamless steel pipe with an outer diameter of φ177.8mm and a wall thickness of 8.05mm comprises the following steps:

[0038] (1) Centrifugal casting: Centrifugal casting technology is used to produce N08028 alloy hollow tube blanks with an outer diameter of φ466mm, an inner diameter of φ210mm, and a length of 1500mm. The hollow tube blanks are quenched in water at a temperature greater than 950°C. After cooling, the hollow tube blanks are homogenized. The homogenization treatment temperature is 1150° C., and the temperature is kept for 16 hours. Then, the inner and outer surfaces of the hollow tube blank are machined: the outer surface is machined 6 mm on one side, and the inner surface is machined 8 mm on one side. After mechanical processing, samples are taken for performance inspection and overall flaw detection. After reaching a complete standard, the hollow tube blank is cleaned in the cleaning machine.

[0...

Embodiment 3

[0047] The manufacturing method of the N08028 alloy coupling material seamless steel pipe with an outer diameter of φ196mm and a wall thickness of 22mm comprises the following steps:

[0048] (1) Centrifugal casting: Centrifugal casting technology is used to produce N08028 alloy hollow tube blanks with an outer diameter of φ466mm, an inner diameter of φ210mm, and a length of 1500mm. The hollow tube blanks are quenched in water at a temperature greater than 950°C. After cooling, the hollow tube blanks are homogenized. The homogenization treatment temperature is 1150° C., and the temperature is kept for 18 hours. Then, the inner and outer surfaces of the hollow tube are machined: the outer surface is machined 2 mm on one side, and the inner surface is machined 3 mm on one side. After mechanical processing, samples are taken for performance inspection and overall flaw detection. After reaching a complete standard, the hollow tube blank is cleaned in the cleaning machine.

[0049...

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Abstract

The invention discloses a manufacturing method of a N08028 seamless alloy steel pipe, and relates to the technical field of seamless steel pipe manufacturing. The method includes the steps of (1) centrifugal casting: adopting a centrifugal casting technology to produce a N08028 hollow alloy pipe billet; (2) radial forging: utilizing a radial forging machine to perform radial forging on the hollow pipe billet to form a radial-forged billet; (3) hot broaching: utilizing a broaching machine to perform hot broaching on the radial-forged billet to form a billet; (4) hot extrusion: utilizing an extruder to perform hot extrusion forming on the billet to form a hot-extruded pierced billet; (5) cold deformation: utilizing a cold rolling machine unit or the radial forging machine to perform cold deformation on the hot-extruded pierced billet to form the seamless steel pipe. The method is high in material utilization rate and low in manufacturing cost and rejection rate, and the N08028 seamless alloy steel pipe is good quality, can meet requirements on corrosion resistance as well as meet working requirements of severe oil-gas field environments, and has high strength and hardness.

Description

technical field [0001] The invention relates to the technical field of manufacturing seamless steel pipes, in particular to the manufacturing of seamless steel pipes for oil wells. Background technique [0002] Since the 1960s, with the successive discovery and exploitation of ultra-deep and high-sulfur oil and gas wells, the requirements for seamless steel pipes for oil well pipes, oil casing pipes and coupling materials have become more and more stringent. At present, about 1 / 3 of the world's oil and gas fields contain H 2 S gas, most of my country's oil and gas resources contain CO 2 and H 2 S. Among them, part of the well gas contains only CO 2 or H only 2 S, while more oil well gas also contains CO 2 and H 2 S. Since such oil and gas wells contain a large amount of H 2 S, CO 2 , Cl - Ordinary carbon steel, low alloy steel, and even 13Cr, 22Cr and other stainless steels can no longer meet the requirements of the mining environment. The oil industry urgently ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 王黎晖巩国平叶海潮于满王明新宋亚峰刘富强王磊邢德科庞于思张爱亮张学涛徐晓雷申勇高杰郝云龙刘静邵海丽
Owner XINXING DUCTILE IRON PIPES CO LTD
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