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Preparation method of wear-resistant composite pipe with cast iron/carbon steel honeycomb sandwich structure

A technology of honeycomb sandwich structure and composite pipe, which is applied in the direction of manufacturing tools and other manufacturing equipment/tools, etc., can solve the problems of low production efficiency, complicated process, and low comprehensive toughness, and achieve high production efficiency, simple operation, and expanded pipe material The effect of specification

Inactive Publication Date: 2011-12-28
江苏北科高新管业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of complex process, low production efficiency and low comprehensive toughness in the production technology of cast iron / carbon steel composite pipe, the present invention provides a new type of preparation method for wear-resistant composite pipe of cast iron / carbon steel honeycomb sandwich structure, Can be used to prepare cast iron / carbon steel composite pipes with high bonding strength, and greatly shorten the production process

Method used

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  • Preparation method of wear-resistant composite pipe with cast iron/carbon steel honeycomb sandwich structure
  • Preparation method of wear-resistant composite pipe with cast iron/carbon steel honeycomb sandwich structure
  • Preparation method of wear-resistant composite pipe with cast iron/carbon steel honeycomb sandwich structure

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Effect test

Embodiment 1

[0030] Three-layer cast iron / carbon steel honeycomb sandwich structure wear-resistant composite pipe composed of ZG270-500 / 18Cr / ZG270-500, the metal thickness ratio of each layer in the finished product is: h 1 : h 2 : h 3 =1:1:1, the outer diameter of the finished composite pipe is Φ650, and the thickness is 20mm.

[0031] according to image 3 , the specific production steps are as follows:

[0032] 1) Preparation of cast iron / carbon steel honeycomb sandwich structure centrifugal casting composite tube billet

[0033] according to figure 1 As shown, the Φ800 series centrifugal casting composite tube blank is used, the thickness is 100mm, and the outer radius R 3 800mm, inner diameter R i 732mm, R 1 =672mm,R 2 = 600mm. According to the above dimensions, calculate the required weight of each layer of molten steel and molten iron. According to the requirements of the national standard, molten steel and molten iron of each component are smelted.

[0034] The casting p...

Embodiment 2

[0048] Three-layer cast iron / carbon steel honeycomb sandwich structure wear-resistant composite pipe composed of ZG270-500 / 18Cr / ZG270-500, the metal thickness ratio of each layer in the finished product is: h 1 : h 2 : h 3 =1:1:1, the outer diameter of the finished composite pipe is Φ50, and the thickness is 5mm.

[0049] The specific production steps are as follows:

[0050] 1) Preparation of cast iron / carbon steel honeycomb sandwich structure centrifugal casting composite tube billet

[0051] according to figure 1 As shown, the Φ90 series centrifugal casting composite tube blank is used, the thickness is 25mm, and the outer layer radius is R 3 90mm, inner diameter R i 732mm, R 1 =672mm,R 2 = 40mm. According to the above dimensions, calculate the required weight of each layer of molten steel and molten iron. According to the requirements of the national standard, molten steel and molten iron of each component are smelted.

[0052] The casting process of centrifugal ...

Embodiment 3

[0066] The three-layer cast iron / carbon steel composite pipe composed of 45# steel / 18Cr / 45# steel, the metal thickness ratio of each layer in the finished product is: h 1 :h 2 :h 3 =1:1:1, the outer diameter of the finished composite pipe is Φ100, and the thickness is 4mm.

[0067] The specific production steps are as follows:

[0068] 1) Cast centrifugal billet.

[0069] Using Φ260 series centrifugal casting slab, the thickness is 30mm, the outer radius R 3 130mm, inner diameter R i 100mm, R 1 =120mm, R 2 =113mm. According to the above dimensions, calculate the required weight of each layer of molten steel and molten iron. According to the requirements of the national standard, molten steel and molten iron of each component are smelted.

[0070] The casting process of the composite tube blank is as follows: first cast the 45# steel layer, the pouring temperature is 1540 ℃ ~ 1590 ℃, the degree of superheat is 40 ℃ ~ 90 ℃, and the centrifuge speed is 400 ~ 600 rpm. Wh...

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Abstract

The invention discloses a preparation method of a cast iron / carbon steel honeycomb sandwich structure wear-resistant composite pipe, which can produce various powder materials or wear-resistant metal composite pipes used in fluid transportation. The process scheme adopted in the present invention is: according to the composition and size requirements of the inner and outer layers of the finished product, cast a three-layer composite tube blank in which the inner layer and the outer layer are carbon steel, and the middle layer is high-chromium cast iron; the tube blank is heated Rolling deformation causes the middle layer to be partially fragmented, forming a "honeycomb" or "mosaic" structure, which is inlaid with the inner and outer layers of carbon steel to obtain composite pipe products of different specifications; for thin-walled pipes, continue Carry out cold rolling deformation. The bonding strength between layers of the composite pipe is high, and the inhomogeneity of the interface structure is eliminated through the annealing process. The high-chromium cast iron layer in the middle of the composite pipe is combined with two layers of carbon steel in a "honeycomb" or "mosaic" manner, which has high strength and toughness. The method has short process flow, simple operation, no need for major equipment modification, and high feasibility.

Description

technical field [0001] The invention relates to a short-process preparation method of a wear-resistant composite pipe with a cast iron / carbon steel honeycomb sandwich structure, which is mainly aimed at high wear-resistant metal composite pipes for material transportation. Background technique [0002] The metal composite pipe is composed of two or more different materials (such as carbon steel, stainless steel, copper, aluminum, titanium, nickel and other alloys), combined into one through various connection technologies, and has the advantages of each layer of materials Compared with the traditional single-layer metal pipe, the two-layer or multi-layer metal composite pipe can save the amount of precious alloy on the one hand, and has good comprehensive performance on the other hand. Metal composite pipes have been widely used in petroleum, chemical industry, seawater desalination, salt production, nuclear industry, food industry, water conservancy facilities construction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04B22D13/00B22D19/16C21D1/26C21D8/10C21D1/18C21D1/28
Inventor 韩静涛戴桃勋解国良戴美华姜正义
Owner 江苏北科高新管业有限公司
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