Production process of composite steel pipe with cermet lining

A cermet, composite steel pipe technology, applied in the field of steel surface coating, can solve the problems of poor corrosion resistance, high hardness, poor toughness, etc., and achieve the effects of wide application, adjustable composition, and increased reaction temperature

Inactive Publication Date: 2006-05-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-propagating centrifugal method has been applied to the manufacture of ceramic-lined steel pipes (such as Japanese patent J58047550, Chinese patent 90107244.4). The self-propagating ceramic-lined steel pipe has excellent wear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1: Fe 2 O 3 320g powder and 108g Al powder are mixed uniformly and used as the raw material powder for forming the binder phase. WO 3 464g powder, 54g Al powder, and 24g graphite powder are mixed uniformly and used as the raw material powder to generate the hard ceramic phase. Mix the above powders uniformly, preheat at 100°C, and put them into the mother tube. The mother pipe is a carbon steel pipe with Ф74mm, wall thickness 4mm and length 200mm. The steel pipe is mounted on the centrifuge, and the centrifuge is turned on at a speed of 1110 rpm (the centrifugal acceleration of the reaction material is 500m / s 2 ), the material is ignited with tungsten wire, a combustion reaction occurs under centrifugal force, and huge heat is released. After cooling, the aluminum oxide layer on the surface is removed to obtain a cermet with iron as the binder phase and tungsten carbide as the hard phase. Lining steel pipe.

Example Embodiment

[0017] Example 2: NiO powder 333g, Al powder 81g, mixed uniformly, as the raw material powder for generating the binder phase. TiC powder 50g is used as the raw material powder of the hard ceramic phase. Mix the above-mentioned raw materials uniformly, preheat at 100°C, and rotate at 3600 rpm (the centrifugal acceleration of the reaction raw materials is 4975m / s 2 ). The remaining steps are the same as in Example 1, and a cermet lined steel pipe with TiC as the hard phase and Ni as the binding phase can be made.

Example Embodiment

[0018] Example 3: Fe 2 O 3 320g powder and 108g Al powder are mixed uniformly and used as the raw material powder for forming the binder phase. TiO 2 160 g, 144 g of Al powder, and 24 g of graphite powder are used as the raw material powder for generating the hard ceramic phase. Mix the above-mentioned raw materials uniformly, preheat at 350℃, and rotate at 2700 rpm (the centrifugal acceleration of the reaction raw materials is 2934m / s 2 ), the rest of the steps are the same as in Example 1, and the cermet lined steel pipe with TiC as the hard phase and Fe as the binding phase can be made.

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PUM

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Abstract

The present invention provides the production process of composite steel pipe with cermet lining, and belongs to the field of steel surface coating technology. The production process includes mixing ferric oxide powder, aluminum powder, WO3 powder and graphite powder in the proportioning of reaction expression of Fe2O3+2(1+x)Al+xWO3+xC=(x+1)Al2O3+2Fe+xWC, where x is 0.5-3; reaction at high temperature to produce alumina, Fe in molten state and W and C dissolved in molten Fe; applying centrifugal force for alumina to distribute in the inner surface of steel pipe and Fe to combine with mother pipe metallurgically; lowering temperature for W and C to combine into WC separated from the molten Fe and distributed inside the metal layer and for the molten Fe to combine with mother pipe metallurgically; and eliminate surface oxide scale after cooling to obtain composite steel pipe with cermet lining. Different kinds of cermet lined steel pipe with adjustable components may be produced.

Description

technical field [0001] The invention belongs to the technical field of steel surface coating, and in particular provides a method for preparing a cermet-lined composite steel pipe. A method of coating a layer of cermet on the inner surface of steel pipe by self-propagating centrifugal method. Background technique [0002] The development of modern industry requires a large number of pipelines for transportation, and the pipes are required to have certain wear resistance and corrosion resistance. At present, there are not many production methods for composite pipes, mainly including nesting method, centrifugal casting, bimetallic centrifugal casting, composite material welding, and SHS-centrifugal method. Among them, the SHS-centrifugal method has obvious advantages. Compared with the traditional rolling cladding, sintering cladding, and explosive cladding, it has the characteristics of simple process and low energy consumption. The SHS-centrifugal method can be used to man...

Claims

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Application Information

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IPC IPC(8): C04B35/65B22D19/08C04B35/653
Inventor 郭志猛高峰林涛
Owner UNIV OF SCI & TECH BEIJING
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