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Production method of stainless steel brazing composite seamless pipe fittings

A technology of stainless steel pipe and production method, applied in the direction of pipe/pipe joint/pipe fitting, pipe, rigid pipe, etc., to achieve the effect of reducing the design wall thickness, low price and obvious economy

Active Publication Date: 2009-06-24
JIANGYIN CHEM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current production of stainless steel composite seamless pipe fittings is because the stainless steel composite seamless steel pipe used is an ordinary lined stainless steel composite steel pipe. The bonding strength with the carbon steel layer is only 6-10MPa, and the stainless steel composite seamless pipe fittings made from it can only be used in low-pressure pipeline transportation occasions

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0014] The present invention will be further described below by way of examples, but not limited to the given examples:

[0015] Example 1. Production of 90°1.5Dφ168mm*(5+2)mm elbow:

[0016] (1) Select 20# carbon steel seamless steel pipe of φ133*8mm, cut the length to 370mm, and the inner diameter of the car to φ119mm (H8), the shape tolerance of the processed carbon steel seamless steel pipe is cylindricity≤0.1mm, roughness Ra is 3.2um, clean the outer surface of the processed carbon steel seamless steel pipe, so that the outer surface is free of oil and dust;

[0017] (2) Select a section of 304 stainless steel seamless steel pipe of φ120*3mm, cut the length to 370mm, and the outer diameter of the car to φ119mm (e7), the shape tolerance of the processed stainless steel seamless steel pipe is cylindricity≤0.1mm, roughness Ra 3.2um, clean the inner surface of the processed stainless steel pipe, so that the inner surface is free of oil and dust;

[0018] (3) Put the φ119mm ...

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Abstract

The invention relates to a production method of a stainless steel brazed composite seamless pipe fitting. The production method comprises the following steps: firstly selecting a carbon steel seamless steal pipe and machining the inner surface of the carbon steel seamless steal pipe; then selecting a stainless steel pipe with the same length as the carbon steel seamless steal pipe, and machining the outer surface of the stainless steel pipe; placing the machined stainless steel pipe into the machined carbon steel seamless steal pipe, and filling a brazing material between two layers of the steel pipes, wherein, the brazing material is a Ag-Cu-Ni high-temperature silver-based brazing material with a high silver content; and machining the obtained composite pipe according to the pipe fitting desired to be produced to obtain the finished pipe fitting with the desired size and shape, wherein, the heating temperature is 910-960 DEG C. The production method has the advantages of producing the stainless steel brazed composite seamless pipe fitting with high bonding strength and being applicable to middle-pressure pipe transportation and high-pressure pipe transportation.

Description

1. Technical field [0001] The invention relates to a production method of stainless steel composite seamless pipe fittings, in particular to a production method of stainless steel brazing composite seamless pipe fittings. 2. Background technology [0002] In the current modern industrial production such as petroleum, chemical industry, water treatment, etc., stainless steel materials are used in the occasions where the pipelines for conveying fluids have corrosion resistance requirements. However, the price of stainless steel is much higher than that of carbon steel, and the yield strength of stainless steel is lower than that of carbon steel. Therefore, under the same pressure and environmental conditions, the amount of stainless steel is more than that of carbon steel, which greatly increases the cost of the project. The cost does not meet the requirements of building a conservation-oriented society in our country. Therefore, there is an urgent need for a new type of pipe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02
Inventor 陈少忠潘和清
Owner JIANGYIN CHEM MASCH CO LTD
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