CN1116955C - Medium flash welding method for high manganese steel frog and carbon steel rail - Google Patents
Medium flash welding method for high manganese steel frog and carbon steel rail Download PDFInfo
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- CN1116955C CN1116955C CN00121442A CN00121442A CN1116955C CN 1116955 C CN1116955 C CN 1116955C CN 00121442 A CN00121442 A CN 00121442A CN 00121442 A CN00121442 A CN 00121442A CN 1116955 C CN1116955 C CN 1116955C
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Abstract
The present invention relates to a medium flash welding method for high manganese steel frogs and carbon steel rails. CrMnNiMo austenite-ferrite dual-phase steel is used as media, and high manganese steel frogs and carbon steel rails which have large difference in welding properties are connected with each other by a flash welding method. The method of the present invention comprises the following steps: firstly, the carbon steel rails are preheated to 200 to 600 DEG C, and the carbon steel rails are welded with media by the flash welding; the media are cut and reserved by 20 to 40mm; then, the temperature of the welding joint is kept for 10 to 30 minutes at the temperature of 800 to 900 DEG C, and stress-relief anneal is carried out. The welding joint is welded with the high manganese steel frogs by the flash welding after the welding joint is cooled to the room temperature.
Description
The present invention relates to the method for attachment of a kind of high manganese steel frog and carbon steel rail.
In present technology, the method with high manganese cast steel spare or manganese steel rail are connected with the carbon steel rail is disclosed by United States Patent (USP) (US.5,304,777) Deutsche Bundespatents (DE-PS2952079) Chinese patents (ZL91104903.7).The potassium steel of U.S. Patent Publication is that austenite---ferritic stainless steel is as being connected material in employing with the carbon steel solder technology, its welding method is: at first utilize the craft of MIG or TIG or automatic surfacing method with austenite---ferritic stainless steel welding wire padding utilizes electric arc or Laser Welding method that carbon steel overlaying surface and potassium steel is welded together at carbon steel one end then; The disclosed potassium steel of Deutsche Bundespatent is to adopt a kind of austenitic steel as being connected material with the solder technology of carbon steel, its welding method is earlier potassium steel to be connected the material welding with austenite, and carry out a solution annealing and quenching-in water heat treatment, then austenite material and carbon steel are welded together, and take corresponding cooling provision; The technology that is connected with rail that carbon steel is made such as railway frog member or manganese steel rail that the disclosed high manganese cast steel spare of Chinese patent constitutes is that the connector made of employing low-carbon (LC) austenitic steel is with above-mentioned two kinds of methods that member welds.Because the physical property of two kinds of materials differs bigger, so this technology is carried out the long-time diffusion annealing of high temperature to welding point, high-temperature holding time reaches 2-5 hour, thereby the method for attachment of this high manganese steel frog and carbon steel rail, consumes energy is many, and the production cycle is long, and production efficiency is low.
The object of the present invention is to provide a kind of employing CrMnNiMo series austenite---the ferrite dual phase steel is as dielectric material, with the glisten method of welding of high manganese steel frog and carbon steel rail.This method is saved the energy, and is with short production cycle, automaticity height, production efficiency height.
This high manganese steel frog and carbon steel rail add medium flash welding method, it is characterized in that: employing CrMnNiMo series austenite---the ferrite dual phase steel is as dielectric material, and its technical process is: (1) carbon steel rail is preheating to 200-600 ℃; (2) medium is butt welded to the carbon steel rail flash; (3) welding point is incubated 10-30 minute stress relief annealing between 800-900 ℃; (4) medium is cut stayed 20-40mm length; (5) cut and stay medium and high manganese steel frog flash of light welding; Carbon steel rail weld preheating optimum temperature is 400 ℃, and dielectric material composition (weight %) is: C :≤0.1, Cr:18-20, Mn:4-6, Ni:6-8, Mo:2-3, S+P≤0.04, and all the other are iron; Ferritic content (weight %) is about 10% in the dual phase steel: during the flash of light welding, and flashing speed 〉=3mm/s, upset speed 〉=100mm/s, upset pressure 〉=70Mpa; Each material extension elongation equates during welding.
High manganese steel frog and high carbon steel rail are welded together, have certain degree of difficulty selecting for use on dielectric material and the production technology.Because rail steel requires slow cooling in welding process, to prevent occurring martensite and the bigger thermal stress of generation in the heat affected area, and potassium steel in welding process in the heat affected area very easily along the austenite grain boundary carbide precipitate with the grain growth phenomenon takes place, this all can cause the strong attenuation of its performance, therefore, require after the potassium steel welding cold as quickly as possible.In addition, the coefficient of thermal expansion of two kinds of materials differs bigger, directly will produce very big internal stress at the welding point place after the welding, and it not only reduces the intensity and the toughness of welding point, and reduces its fatigue life.
The invention reside in and utilize dielectric material that two kinds of diverse high manganese steel frogs of welding performance and carbon steel rail welding are arrived together.Its basic principle is that dielectric material is a kind of austenite-ferrite dual phase steel, and it is subjected to be difficult in the thermal process that grain growth takes place and carbide is separated out phenomenon follow-up, and physical properties such as its linear expansion coefficient, fusing point, thermal conductivity factor are suitable with potassium steel simultaneously.Fusing point and the heat-transfer rate of considering medium are all low than carbon steel, for guaranteeing the abundant of welding point fusion, earlier the carbon steel rail are preheated to 200-600 ℃, then welding.Because the physical property of dielectric material and carbon steel differs bigger, the welding point interior welds stress of this moment is bigger, and this will seriously reduce the mechanical property of joint, therefore, carry out the high temperature, short time stress relief annealing to it.Yet can effectively postpone the Alloy Elements Mo that carbide forms owing to contain in the medium, therefore be subjected to (comprising flash of light welding and stress relief annealing) in the thermal process at follow-up high temperature, short time, it is organized and still is the austenite of small grains-ferrite duplex structure.Because the physical property of dielectric material and potassium steel is very approaching, so after medium and high manganese steel frog welding, the welding stress of welding point inside is less relatively.In addition, because the flash of light speed of welding is very high, hot input quantity in welding process in the welding point heat affected area is less, the cooling velocity of postwelding joint is very fast, therefore, the postwelding joint cools off in air, can guarantee that carbides-free is separated out in the potassium steel heat affected area, thereby makes whole welding joints have excellent mechanics and serviceability.
The present invention has taken into full account the essential distinction of two kinds of material physical properties, before welding, carbon steel is carried out preheating, improved the welding effect of two kinds of materials greatly, and postwelding only needs to carry out stress relief annealing in 10-30 minute 800-900 ℃ of insulation to welding point, just can guarantee the mechanical property and the serviceability of welding point, shorten process cycle, improved production efficiency.In addition, what the present invention adopted is austenite-ferrite dual phase steel, wherein contain the elements Mo of strengthening matrix, the more single-phase austenite of this material has higher intensity and work hardening capacity, therefore the dual phase steel welding medium is when reality is used, and can not go out phenomenon when the austenite welding medium is long slightly and the phenomenon of wearing and tearing too early in the welding medium position that produces.
The flash butt welding that the present invention utilized belongs to the high temperature solid-state welding.By extruding force metallic atom is engaged one another in the solid-state temperature scope and form joint.In order to realize welding requirements, must remove the oxide-film and the Pingdu that improves contact-making surface on surface to weldment, achieve the goal by bigger plastic deformation.Because the dielectric material that adopts is to contain the higher austenite of Cr, Mn, Ni and Mo-ferrite dual phase steel here, this steel have elevated temperature strength height, conduction and poor thermal conductivity, fusing point low, again a large amount of alloying elements that easily form refractory oxides are arranged, therefore, when flash butt welding, requirement has big upset pressure, high flash of light and upset speed.Flashing speed 〉=3mm/s, upset speed 〉=100mm/s, upset pressure 〉=70Mpa.
Because selected dielectric material is the austenite-ferrite dual phase steel that contains Mo among the present invention, Mo can postpone separating out the time of carbide in the austenite-ferrite steel, make medium in welding and follow-up short time high temperature stress relief annealing process, be unlikely to have carbide to be separated out, it can make medium have higher intensity and work hardening ability simultaneously.
The high manganese steel frog and the carbon steel rail welding part that utilize the present invention to prepare, the chemical composition of potassium steel is generally C:1.1-1.4, Mn:11-14, all the other are Fe and small amount of impurities, the chemical analysis of carbon steel rail is generally C:0.6-0.8, Mn:0.6-1.5, all the other are Fe and small amount of impurities, the tensile strength of welding point reaches more than the 650Mpa, each regional impact flexibility numerical value is all higher, the whole quiet curved value of rail is for being that amount of deflection reached more than the 22mm when quiet curved load was 100T under 1 meter the condition in span, and counter-bending fatigue strength reaches more than the 250MPa.These performance indications can both satisfy the performance requirement of actual railway transportation to high manganese steel frog and carbon steel rail welding structure.
Claims (5)
1, a kind of high manganese steel frog and carbon steel rail add medium flash welding method, it is characterized in that: adopt GrMnNiMo series austenite one ferrite dual phase steel as connecting medium, by flash welding method high manganese steel frog and carbon steel rail are linked together, its technical process is;
(1) the carbon steel rail is preheating to 200-600 ℃;
(2) medium is butt welded to the carbon steel rail flash;
(3) welding point is incubated 10-30 minute stress relief annealing between 800-900 ℃;
(4) medium is cut stayed 20-40mm length;
(5) cut and stay medium and high manganese steel frog flash of light welding.
2, the method that is welded to connect according to claim 1 is characterized in that: the temperature of carbon steel rail weld preheating is 400 ℃.
3, the method that is welded to connect according to claim 1 is characterized in that: dielectric material composition (weight %) is: C :≤0.1, Cr:18-20, Mn:4-6, Ni:6-8, Mo:2-3, S+P≤0.04, all the other are iron.
4, according to claim 1 or 3 described methods of attachment, it is characterized in that: the GrMnNiMo series austenite--ferritic content is about 10% in the ferrite dual phase steel.
5, method of attachment according to claim 1 is characterized in that: the flashing speed 〉=3mm/s of flash of light welding, upset speed 100mm/s, upset pressure 〉=70Mpa; The extension elongation of each material equates during welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00121442A CN1116955C (en) | 2000-07-21 | 2000-07-21 | Medium flash welding method for high manganese steel frog and carbon steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00121442A CN1116955C (en) | 2000-07-21 | 2000-07-21 | Medium flash welding method for high manganese steel frog and carbon steel rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1275463A CN1275463A (en) | 2000-12-06 |
| CN1116955C true CN1116955C (en) | 2003-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN00121442A Expired - Fee Related CN1116955C (en) | 2000-07-21 | 2000-07-21 | Medium flash welding method for high manganese steel frog and carbon steel rail |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395071C (en) * | 2006-03-21 | 2008-06-18 | 天津新港船厂 | Welding method for steel rail and ship deck |
| CN107214406A (en) * | 2017-07-28 | 2017-09-29 | 攀钢集团研究院有限公司 | Control the process of " white block " tissue in bainite rail flash welding joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1301820C (en) * | 2004-10-20 | 2007-02-28 | 南通金通灵风机有限公司 | Method for welding impellers in high strength and eliminating stress of impellers |
| AT505877B1 (en) * | 2007-10-05 | 2010-04-15 | Vae Eisenbahnsysteme Gmbh | INTERMEDIATE PIECE AND METHOD FOR JOINING MANGANIZED SHAPING BODIES WITH RAIL RAILS |
| CN101474713B (en) * | 2009-01-22 | 2011-02-09 | 中铁宝桥股份有限公司 | High manganese steel frog and rail flash butt welding method |
| CN106112241B (en) * | 2016-06-24 | 2018-11-06 | 江苏省沙钢钢铁研究院有限公司 | A kind of flash welding method of high corrosion-proof and high-strength reinforcing bar |
| CN106334863B (en) * | 2016-10-19 | 2018-09-04 | 成都先进金属材料产业技术研究院有限公司 | A kind of method and rail carrying out mobile Flash Butt Welding to 75kg/m hypereutectoid rail and pearlite steel rail |
| CN106702261B (en) * | 2016-12-08 | 2020-02-07 | 共慧冶金设备科技(苏州)有限公司 | Rare earth-containing welding transition steel for high-speed rail and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169745A (en) * | 1977-08-19 | 1979-10-02 | Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft | Method of joining frogs of wear-resisting manganese steel castings to rails of carbon steel |
| CN1058556A (en) * | 1990-07-20 | 1992-02-12 | 沃斯特-阿尔派因火车***有限公司 | The method of attachment of high manganese cast steel point components or manganese steel rail and carbon element rail |
| RU1815071C (en) * | 1990-09-06 | 1993-05-15 | Всесоюзный Научно-Исследовательский Институт Железнодорожного Транспорта | Contact flash-butt welding method |
| US5304777A (en) * | 1991-04-24 | 1994-04-19 | Manoir Industries | Method of connecting a manganese steel part to another carbon steel part and assembly thus obtained |
-
2000
- 2000-07-21 CN CN00121442A patent/CN1116955C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169745A (en) * | 1977-08-19 | 1979-10-02 | Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft | Method of joining frogs of wear-resisting manganese steel castings to rails of carbon steel |
| CN1058556A (en) * | 1990-07-20 | 1992-02-12 | 沃斯特-阿尔派因火车***有限公司 | The method of attachment of high manganese cast steel point components or manganese steel rail and carbon element rail |
| RU1815071C (en) * | 1990-09-06 | 1993-05-15 | Всесоюзный Научно-Исследовательский Институт Железнодорожного Транспорта | Contact flash-butt welding method |
| US5304777A (en) * | 1991-04-24 | 1994-04-19 | Manoir Industries | Method of connecting a manganese steel part to another carbon steel part and assembly thus obtained |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395071C (en) * | 2006-03-21 | 2008-06-18 | 天津新港船厂 | Welding method for steel rail and ship deck |
| CN107214406A (en) * | 2017-07-28 | 2017-09-29 | 攀钢集团研究院有限公司 | Control the process of " white block " tissue in bainite rail flash welding joint |
| CN107214406B (en) * | 2017-07-28 | 2019-06-04 | 攀钢集团研究院有限公司 | Control the process of " white piece " tissue in bainite rail flash welding connector |
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| CN1275463A (en) | 2000-12-06 |
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