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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 resistance, but there are microcracks on the ceramic surface and poor corrosion resistance.
In addition, due to the high hardness and poor toughness of the ceramic phase, there are problems in subsequent processing and pipe connection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Fe 2 o 3 Al powder 320g, Al powder 108g mix evenly, as the raw material powder for forming the bonding phase. WO 3 Powder 464g, Al powder 54g, graphite powder 24g mix uniformly, as the raw material powder that generates hard ceramic phase. Mix the above powders evenly, preheat to 100°C, and put them into the mother tube. The mother pipe is a Ф74mm carbon steel pipe with a wall thickness of 4mm and a length of 200mm. The steel pipe is installed and stuck on the centrifuge, and the centrifuge is started at a speed of 1110 rpm (the centrifugal acceleration of the reaction raw material is 500m / s 2 ), ignite the material with a tungsten wire, a combustion reaction occurs under centrifugal force, and a huge amount of 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. Lined steel pipe.

Embodiment 2

[0017] Example 2: 333g of NiO powder and 81g of Al powder were uniformly mixed as the raw material powder for forming the binder phase. TiC powder 50g, as the raw material powder of hard ceramic phase. Mix the above-mentioned raw material powders evenly, 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 Example 1, and a cermet-lined steel pipe with TiC as the hard phase and Ni as the binding phase can be produced.

Embodiment 3

[0018] Example 3: Fe 2 o 3 Al powder 320g, Al powder 108g mix evenly, as the raw material powder for forming the bonding phase. TiO 2 160g, Al powder 144g, graphite powder 24g as the raw material powder that generates hard ceramic phase. Mix the above-mentioned raw material powders evenly, preheat at 350°C, and rotate at 2700 rpm (the centrifugal acceleration of the reaction raw materials is 2934m / s 2 ), the remaining steps are the same as in Example 1, and can be made into a cermet-lined steel pipe with TiC as the hard phase and Fe as the binder phase.

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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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