Novel technique for producing seamless steel pipe

A technology of seamless steel pipe and new technology, which is applied in the direction of manufacturing tools, metal processing equipment, rolling mill control devices, etc., can solve the problems of expensive cold drawn pipe machine, many processing procedures, high equipment cost, etc., and achieve excellent physical and chemical properties of products, The effect of simple technology and low investment in equipment

Inactive Publication Date: 2009-03-04
北京蓝海科融新技术有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Compared with the above three methods, although this method can produce special steel pipes containing elements such as Cr, Ni, Mo, N, etc., this method still needs an expensive cold drawing machine, and requires multiple cycles of cold drawing, and each After the second cold drawing, so

Method used

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  • Novel technique for producing seamless steel pipe
  • Novel technique for producing seamless steel pipe
  • Novel technique for producing seamless steel pipe

Examples

Experimental program
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Embodiment Construction

[0073] like Figure 4 As shown, according to the first embodiment provided by the present invention, the following process steps are included:

[0074] The first step is to produce a large-diameter and medium-thick-walled hollow billet by centrifugal casting; the centrifugal casting is carried out on an inclined centrifugal casting machine with an angle between the rotation axis of the mold and the horizontal, that is, the inclination angle is 15 to 30 degrees. The large-diameter thick-walled hollow billet produced by centrifugal casting is a hollow billet with an inner diameter closing at one end, that is, a hollow billet with a ring-shaped cup bottom at one end, that is, the inner diameter at the end becomes smaller, forming a hollow billet with a cup bottom 2 1. This cup bottom 2 has a hollow part 21, such as Figure 5 shown. The arrangement of the above-mentioned structure can be beneficial to the subsequent jacking process, and the end of the mandrel of the pipe jacking...

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Abstract

A new process for producing a seamless steel pipe comprises the following processing steps: firstly, producing a hollow pipe blank, at one end of which an annular cup bottom is arranged, through centrifugal casting; secondly, mechanically processing the inner surface and the outer surface of the hollow pipe blank; thirdly, heating the processed hollow pipe blank; fourthly, performing pipe jacking mill processing to the heated hollow pipe blank, and obtaining pipe fittings meeting the requirements of the wall thickness, the diameter and the length; and fifthly, after bar loosening and bar releasing, performing end cropping and finishing operation to the pipe fittings after the pipe jacking mill processing, and obtaining qualified finished product pipe materials. The invention can produce a high-quality stainless steel and special steel pipe difficult to process, and overcomes the defects in the prior art, so as to form an energy-saving, high-quality and economic new process with the short procedure for producing the seamless steel pipe compared with the traditional method.

Description

technical field [0001] The invention relates to the manufacturing technology of seamless steel pipes, in particular to the manufacturing technology of large-caliber medium-thick wall seamless steel pipes. Background technique [0002] Large-diameter seamless steel pipes, especially large-diameter medium-thick-wall seamless steel pipes with a diameter greater than 500 mm and a diameter-to-wall ratio of less than 25, are widely used in important occasions in many industrial fields. Such as: the main steam pipeline used for thermal power generation and the loop pipeline of nuclear power, as well as high-pressure gas cylinders for CNG trailers and gas stations, cylinders of various high-pressure containers, etc. Because of the wide range of uses of large-diameter thick-walled seamless steel pipes, the requirements for their mechanical properties and physical and chemical properties are different, so the selection of their materials and processing methods are also different. For...

Claims

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Application Information

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IPC IPC(8): B23P15/00B22D13/02B22D13/12B21B17/02B21B37/78B21B37/56B21D41/04
CPCB21B23/00B22D13/02
Inventor 刘怀文马晓梅朱玉宝孙德宽朱剑峰李晓桂高澜庆宣晶晶
Owner 北京蓝海科融新技术有限公司
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