CN1111291A - Technology for making corrosion and heat resistant steel lined composite steel pipe - Google Patents

Technology for making corrosion and heat resistant steel lined composite steel pipe Download PDF

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Publication number
CN1111291A
CN1111291A CN 94104459 CN94104459A CN1111291A CN 1111291 A CN1111291 A CN 1111291A CN 94104459 CN94104459 CN 94104459 CN 94104459 A CN94104459 A CN 94104459A CN 1111291 A CN1111291 A CN 1111291A
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CN
China
Prior art keywords
steel
steel pipe
heat
resistant
technology
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CN 94104459
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Chinese (zh)
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CN1049254C (en
Inventor
殷声
柳牧
段辉平
林涛
魏延平
郭志猛
果世驹
赖和怡
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北京科技大学
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Abstract

The said manufacture technology features its thermite-centrifugation process. To Fe2O3+Al material, the oxides of Cr, Ni, W, Ti, etc. are added and the heat thermite reaction produces melts reduced Fe, Cr, N2 and other metal and by-product Al2O3. Molten metals form different-type stainless steel or heat-resisting steel, which combines with other layer steel to form composite steel tube with a combining strength being greater than 25 Kgf/sq.mm. The Cr18Ni9 type stainless steel layer has a corrosion speed in 10% H2SO4 and 10% HCl solution being 4.4g/sq.m. hr and 3.5g/sq.m. hr separately.

Description

The present invention belongs to the field of composite steel pipe making technology.
The corrosion-resistant and heat-resistant steel pipe is widely applied to chemical, petrochemical, metallurgical, light industry and other departments. However, in many cases, the conveying medium is not very corrosive and does not require the use of a monolithic stainless steel tube. In some applications where heat resistance is required, the use of a unitary heat resistant steel tube is also not required. The cost can be greatly reduced by using the stainless steel lining composite steel pipe or the heat-resistant steel lining composite steel pipe.
There are two conventional methods for manufacturing a composite steel pipe with a stainless steel lining or a heat-resistant steel lining. One method is to mechanically combine the stainless steel (or heat resistant steel) inner tube and the carbon steel (or low alloy steel) outer tube and hot work them into a composite tube. The composite steel pipe has the disadvantages of large eccentricity, lack of metallurgical bonding between two pipes, low bonding strength and easy permeation of media. Another method is to manufacture the composite steel pipe by a centrifugal casting method. The disadvantage is that the long distance diffusion of elements between the inner and outer tubes deteriorates the corrosion resistance of stainless steel and the mechanical strength of the outer tube.
Thermite-centrifugation has been applied to the manufacture of ceramic lined steel pipes (for example, japanese patent J58047550 and chinese patent CN 1059376 a). The invention aims to manufacture the composite steel pipe with the corrosion-resistant and heat-resistant steel lining by adopting an aluminothermic-centrifugal method, reduce the cost of the composite pipe and increase the variety and the application range of the composite pipe.
The basic idea of the present invention is to reduce oxides of metals such as iron, chromium, and nickel by thermite reaction, melt the resultant iron, chromium, nickel, and alumina at high temperature by exothermic reaction, and form the metals such as iron into stainless steel (or heat-resistant steel). Under the action of centrifugal force, the stainless steel (or heat-resistant steel) with higher specific gravity and the outer layer mother pipe are combined into a composite steel pipe. While the alumina with a lighter specific gravity floats on the inner surface of the steel pipe. And removing the oxide slag layer to obtain the composite steel pipe with the stainless steel (or heat-resistant steel) lining. The main reaction is as follows:
the key to the manufacture of corrosion and heat resistant steel composite pipes is how to obtain a steel layer that conforms to the composition of stainless steel or heat resistant steel. Al is very soluble in Fe. Excessive AL content in steel impairs the workability of the steel. Since the Cr oxide is difficult to completely reduce, the content of Cr in the steel is insufficient, and the corrosion resistance and heat resistance of the steel are reduced. The idea of the invention is to increase the combustion reaction temperature and the high temperature retention time to complete the reaction, thereby reducing the Al content of the steel and increasing the Cr content. Meanwhile, the addition amount of Al in the ingredients is reduced by 5-25% compared with the stoichiometric amount, and the Al content in the steel is effectively reduced.
The present invention is described in detail below.
1.Fe2O3And Al as the main reaction mass, according to the formula Fe2O3+Al→Fe+Al2O3+ Q, forming the Fe matrix. Q is the exothermic heat of reaction, which produces high temperatures to melt the resultant product. NiO and Cr are added into the above reaction mass simultaneously2O3(or CrO)3Ferrochromium) and a reducing agent Al, Ni and Cr generated by thermite reaction are dissolved in Fe to form the stainless steel. If WO is added to the material3、TiO2And the like, the heat-resistant steel can be formed. Under the action of centrifugal force, the molten stainless steel and the outer layer mother pipe are combined into a composite steel pipe, and Al is molten2O3And the slag layer floats on the inner surface of the steel pipe.
2. The reaction materials are preheated to 100-450 ℃, the combustion reaction temperature and the high-temperature retention time are improved, the reaction is completely carried out, the Al content in the steel is reduced, the Cr content is improved, and the composition of the steel meets the requirements.
3. The addition amount of Al in the reaction materials is 5-25% less than the stoichiometric amount.
4. The centrifugal force is selected between 50-300G. G is the gravitational acceleration.
The invention has the advantage of manufacturing different types of compositesteel pipes with stainless steel and heat-resistant steel linings. Two layers of composite steel pipe are combinedStrength greater than 25kgf/mm2. The composite steel pipe has good corrosion resistance and heat resistance. The cost of the composite steel pipe is lower than that of the traditional composite steel pipe, the integral stainless steel and the heat-resistant steel pipe, and the application range is wide.
Example 1:
the mother pipe is a 20-carbon steel pipe, the outer diameter is phi 76mm, the wall thickness is 4mm, and the length is 1 m. The mixed and preheated materials at 100 ℃ are filled into the mother pipe: 1900 g Fe2O3300g of CrO3300g of Cr2O3140 grams of NiO and 740 grams of Al powder. The steel tube is clamped on a centrifuge, the centrifuge is started, and the reaction materials are ignited by tungsten wires at the rotation speed of 1800 rpm. Through high-temperature combustion reaction under centrifugal force, the molten product stainless steel layer and the carbon steel outer pipe are combined into a composite steel pipe, and Al floating on the inner surface of the steel pipe2O3The oxide slag layer is removed. The stainless steel layer of the composite tube obtained was about 1.2mm thick and had the composition (%): cr17.6, Ni7.1, All.4, C less than 0.01 and the balance Fe. The bonding strength (shear strength) of the composite steel pipe is more than 25kgf/mm2. Hardness of stainless steel layer HRB94-106 at 10% H2SO4And 10% HCl (20 ℃ C.), the corrosion rates are respectively 18.9g/m2H and 13.1g/m2H. The microstructure is shown in FIG. 1.
Example 2:
1750 g Fe2O3600 g of Cr2O3400 g of ferrochrome (containing Cr 65%), 210 g of NiO and 800 g of Al powder were mixed and preheated to 350 ℃ and loaded into the steel pipe of example 1, and a stainless steel-lined composite steel pipe was formed as in example 1. The stainless steel layer has a thickness of about 1.4mm and comprises the following components in percentage by weight: cr18.2, Ni8.3, Al0.3, C less than 0.01 and the balance of Fe. The bonding strength of the composite steel is more than 25kgf/mm2. At 10% H2SO4And 10% HCl (20 ℃ C.), the corrosion rates are respectively 4.4g/m2H and 3.5g/m2H. The microstructure is shown in FIG. 2.
Example 3:
1750 g Fe2O3600 g of Cr2O3560 g of ferrochrome (Cr 65%), 210 g of NiO and 800 g of Al powder, mixed and preheated at 450 ℃ were charged into the steel tube of example 1 and the steel tubes were fitted as in the examples1, manufacturing the stainless steel lined composite steel pipe. The stainless steel layer has a thickness of about 1.5mm and comprises the following components in percentage by weight: cr24.4, Ni8.4, Al0.1, C less than 0.01 and the balance of Fe. At 10% H2SO4At medium temperature (20 ℃), the corrosion speed is 0.04g/m2·h。
Example 4:
1120 g Fe2O3540 g of Cr2O3140 g of NiO and 140 g of WO3100 g of TiO260 g of ferrochrome (containing Cr 65%) and 810 g of Al powder were mixed, preheated at 300 ℃ and then charged into a 15CrMo heat-resistant steel pipe having an outer diameter of phi 89mm, a wall thickness of 6mm and a length of 1m to prepare a heat-resistant steel lined composite steel pipe as in example 1. The thickness of the heat-resistant steel layer is about 1.0mm, and the components are as follows (%): cr14.1, Ni37.2, W5.5, Ti2.9, Al1.6, C less than 0.01 and the balance of Fe.
This isfurther explained below with reference to the drawings.
FIG. 1 is an SEM of a stainless steel lined composite steel pipe of example 1 with stainless steel on the left and carbon steel on the right and a transition layer in the middle layer, about 200 μm thick. The distribution curves of Cr, Ni and Al are shown. The content of elements decreases gradually from stainless steel to carbon steel. The transition layer of the stainless steel and the carbon steel is obviously metallurgically bonded. The stainless steel structure is mainly austenite and contains partial pearlite. The structure of the transition layer is isometric crystal. The stainless steel structure is columnar crystal.
FIG. 2 shows the microstructure and distribution curves of Cr, Ni and Al elements of example 2. The transition layer is about 60 μm thick. The stainless steel layer has an austenite structure.

Claims (4)

1. A technology for manufacturing the anticorrosion and refractory steel-lined composite steel pipe features use of aluminothermic-centrifugal method to react Fe2O3+ Al, adding oxides of Cr, Ni, W, Ti, etc. (or adding them in the form of ferroalloy), and reducing Fe, Cr, Ni and other metals and by-product Al by using high temperature generated by aluminothermic reaction2O3And melting, wherein the molten metal forms precipitation hardening type, austenite-ferrite type stainless steel or heat-resistant steel, and the stainless steel or the heat-resistant steel and the outer layer mother steel pipe are combined into the composite steel pipe under the action of centrifugal force.
2. The technology for manufacturing a corrosion-resistant and heat-resistant steel lined composite steel pipe as claimed in claim 1, wherein the reaction materials are preheated at 100-450 ℃, and the materials are loaded into the mother steel pipe after preheating or the mother steel pipe is preheated together with the reaction materials.
3. The technology for manufacturing the corrosion-resistant heat-resistant steel lined composite steel pipe according to claim 1 or 2, wherein the addition amount of Al in the reaction material is 5-25% less than the stoichiometric amount.
4. The technology for manufacturing a corrosion-resistant and heat-resistant steel lined composite steel pipe as claimed in claim 1 or 2, wherein the centrifugal force is selected from the range of 50 to 300G, G being the acceleration of gravity.
CN94104459A 1994-05-06 1994-05-06 Technology for making corrosion and heat resistant steel lined composite steel pipe CN1049254C (en)

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CN94104459A CN1049254C (en) 1994-05-06 1994-05-06 Technology for making corrosion and heat resistant steel lined composite steel pipe

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Application Number Priority Date Filing Date Title
CN94104459A CN1049254C (en) 1994-05-06 1994-05-06 Technology for making corrosion and heat resistant steel lined composite steel pipe

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CN1111291A true CN1111291A (en) 1995-11-08
CN1049254C CN1049254C (en) 2000-02-09

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1317425C (en) * 2005-11-07 2007-05-23 北京科技大学 Production process of composite steel pipe with cermet lining
CN1329345C (en) * 2005-11-10 2007-08-01 北京科技大学 Additive used for preparing ceramic lining steel pipe by self straggle high temperature synthesis
CN1978095B (en) * 2005-12-02 2010-04-21 东芝机械株式会社 Melt supply pipe for aluminum die casting and method for producing the same
CN102086023A (en) * 2009-12-08 2011-06-08 北京航空航天大学 In-situ synthesis method combining sol-gel with thermit reaction and FeNiCrTi/NiAl-Al2O3 nano composite material synthesized by method
CN102747315A (en) * 2012-04-16 2012-10-24 湖南大学 Technology for repairing roll by high-temperature molten-steel spray deposition based on thermit reaction
CN102817030A (en) * 2012-09-06 2012-12-12 南通大学 Method for preparing a metal/ceramic wear-resisting composite lining plate by means of self-propagating high-temperature synthesis
CN103557377A (en) * 2013-11-06 2014-02-05 周小新 Method for preparing ceramic-lined composite stainless steel tube
CN104024459A (en) * 2011-12-27 2014-09-03 株式会社神户制钢所 Heat-resistant austenitic stainless steel highly inhibited from releasing scale, and stainless-steel pipe
CN106048598A (en) * 2016-06-29 2016-10-26 巢湖鹏远金属焊管有限公司 Method for enhancing strength of metal welded pipes
CN106122680A (en) * 2016-06-29 2016-11-16 巢湖鹏远金属焊管有限公司 A kind of high-strength corrosion-resisting straight welded pipe
CN109047700A (en) * 2018-07-19 2018-12-21 柳州市创科复合金属陶瓷制品有限公司 A kind of compound body of roll production method of bimetallic

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5934469B2 (en) * 1981-09-12 1984-08-22 Kogyo Gijutsu Incho
CN1029352C (en) * 1990-09-01 1995-07-19 北京科技大学 Manufacturing technique of corrosion-proof wear-ressistant ceramic-lined steel pipe

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1317425C (en) * 2005-11-07 2007-05-23 北京科技大学 Production process of composite steel pipe with cermet lining
CN1329345C (en) * 2005-11-10 2007-08-01 北京科技大学 Additive used for preparing ceramic lining steel pipe by self straggle high temperature synthesis
CN1978095B (en) * 2005-12-02 2010-04-21 东芝机械株式会社 Melt supply pipe for aluminum die casting and method for producing the same
CN102086023A (en) * 2009-12-08 2011-06-08 北京航空航天大学 In-situ synthesis method combining sol-gel with thermit reaction and FeNiCrTi/NiAl-Al2O3 nano composite material synthesized by method
WO2011069443A1 (en) * 2009-12-08 2011-06-16 北京航空航天大学 In situ preparation method of sol-gel combining with thermite reaction and fenicrti/nial-a12o3 nano-composite material prepared therefrom
CN102086023B (en) * 2009-12-08 2014-01-29 北京航空航天大学 In-situ synthesis method combining sol-gel with thermit reaction and FeNiCrTi/NiAl-Al2O3 nano composite material synthesized by method
CN104024459B (en) * 2011-12-27 2016-06-01 株式会社神户制钢所 The heat-resisting austenite stainless steel of anti-oxidant skin separability excellence and stainless steel tube
CN104024459A (en) * 2011-12-27 2014-09-03 株式会社神户制钢所 Heat-resistant austenitic stainless steel highly inhibited from releasing scale, and stainless-steel pipe
CN102747315A (en) * 2012-04-16 2012-10-24 湖南大学 Technology for repairing roll by high-temperature molten-steel spray deposition based on thermit reaction
CN102747315B (en) * 2012-04-16 2014-06-04 湖南大学 Technology for repairing roll by high-temperature molten-steel spray deposition based on thermit reaction
CN102817030A (en) * 2012-09-06 2012-12-12 南通大学 Method for preparing a metal/ceramic wear-resisting composite lining plate by means of self-propagating high-temperature synthesis
CN103557377A (en) * 2013-11-06 2014-02-05 周小新 Method for preparing ceramic-lined composite stainless steel tube
CN103557377B (en) * 2013-11-06 2015-09-09 周小新 The preparation method of ceramic-lined composite stainless steel pipe
CN106048598A (en) * 2016-06-29 2016-10-26 巢湖鹏远金属焊管有限公司 Method for enhancing strength of metal welded pipes
CN106122680A (en) * 2016-06-29 2016-11-16 巢湖鹏远金属焊管有限公司 A kind of high-strength corrosion-resisting straight welded pipe
CN109047700A (en) * 2018-07-19 2018-12-21 柳州市创科复合金属陶瓷制品有限公司 A kind of compound body of roll production method of bimetallic

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