CN1745963A - Forging (rolling) manufacture of high-manganese steel frog centering rail - Google Patents
Forging (rolling) manufacture of high-manganese steel frog centering rail Download PDFInfo
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- CN1745963A CN1745963A CN 200510113952 CN200510113952A CN1745963A CN 1745963 A CN1745963 A CN 1745963A CN 200510113952 CN200510113952 CN 200510113952 CN 200510113952 A CN200510113952 A CN 200510113952A CN 1745963 A CN1745963 A CN 1745963A
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Abstract
A forging (rolling) technology for manufacturing the frog rail with high-Mn steel includes such steps as smelting ordinary of alloyed high-Mn steel ingot, forging (rolling) for shaping the blank, toughening in water or slow cooling-reheating for toughening, and machining. Its advantages are high mechanical performance and load-bearing power, and improved internal structure.
Description
Technical field
The present invention relates to a kind of forging (rolling) production method that is used for railway assembled frog high manganese steel frog heart rail, relate in particular to potassium steel cast the steel ingot heat tracing after, adopt the method for forging (rolling) to carry out forging molding, the process of then carrying out the tough processing of water and being machined into high manganese steel frog heart rail.
Background technology
Railway frog is most important parts on the railway line, and it is bearing the task of turning to shunting.The load that it bears is the high speed impact and the friction of train wheel.Advantages such as under the service condition of this harshness, potassium steel still has good toughness, and the carrying sclerosis is high, and wearability is good are so potassium steel all is widely used in the manufacturing of railroad frog since the last 100 years always.
The chemical composition of widely used common potassium steel (ZGMn13) railway frog is C0.9%-1.4%, Mn11%-14%, and all the other are iron and small amount of impurities element, as, Si, S, P etc.Original railway frog is generally the block cast high manganese steel frog, owing in casting process, exist casting flaw miscellaneous, as loose, shrinkage cavity, micro-crack, crystal grain with field trash is thick and composition microstructure segregation etc., collapse, peel off piece etc. and make railway frog be easy to produce vertical equity crackle, vertical crack, pressure in use, thereby cause high manganese steel frog to lose efficacy, reduce service life.At present, only be 1.2 hundred million tons the average life (overload quantity) of the block cast high manganese steel frog of China's production.
In order further to improve the service life of high manganese steel frog, people have carried out research extensively and profoundly from following two aspects, have obtained many achievements in research, thereby make railway frog that raising by a relatively large margin arranged service life:
The first, improve from material, i.e. service life of on the basis of original potassium steel chemical composition, improving railway frog by the means of alloying.National patent " the special-purpose nitrogen austenite Mn-Cr steel of railroad frog " (publication number CN1451777) has been reported and added a certain amount of nitrogen, chromium, vanadium and rare earth element on the basis of common potassium steel chemical composition, and improving 50%-80% the service life that makes high manganese steel frog, overload quantity can reach more than 200,000,000 tons.
The second, from designing the general structure of railway frog is improved, adopted new structure---assembled frog.Only make in the railway frog heart rail or the fork heart partly adopt casting potassium steel or steel alloy.By welding and/or bolted method they and wing rail or wing rail and the rail that connects with the heart are coupled together, be combined into assembled frog.
For casting potassium steel heart rail and since its size reduce its inner casting flaw will be reduced and is improved the service life of assembled frog.Its operating overload amount can reach 1.8 hundred million tons.But such measure can not be eliminated the existence of casting flaw fully, thus they to improve the degree in railway frog service life be limited.Along with the development of heavy duty, bullet train, the inner deficiency that exists of casting potassium steel further highlights, and farthest eliminates the casting flaw of casting potassium steel, and got a greater increase the service life of this type of potassium steel heart rail assembled frog.
For steel alloy,, further raising has been arranged in service life of assembled frog and make because its intensity is higher as the assembled frog central track or the fork heart.Wherein, most representative steel alloy is a bainitic steel.National patent " high speed quasi high-speed highway railway frog high-performance abrasion-proof steel " (publication number CN1208776) and patent " the weldable air-cooled great health bainitic steel of the special-purpose superpower high-ductility of railroad frog " (publication number CN1256323) have been reported and have been adopted bainitic steel to replace casting potassium steel as the heart rail in the assembled frog, and patent " railway smithwelding railway frog " (publication number CN2302284) and patent " the compound railway frog of steel alloy " (publication number CN2570315) have further been reported in the structure of assembled frog, heart rail has adopted middle manganese or Mn-Cr steel and steel alloy respectively, and improved the service life of assembled frog, be more than 2 times of block cast high manganese steel frog its service life.
Why can improve the assembled frog reason in service life for alloy steel core rail, they generally think because the institutional framework of alloy steel core rail is higher bainite structure of obdurability or bainite/martensite heterogeneous structure, thereby are improved service life.But we know that the intensity of material is high more, and usually its plasticity and toughness will be low more.And for being under the operating mode of this harshnesses such as the high speed impact of train wheel and friction in the load that railway frog bore, in order to improve the service life of assembled frog, we should be emphasized that and are guaranteeing that material has on the basis of higher-strength, improves the plasticity and the toughness of material as much as possible.On earth where, the reason of steel alloy assembled frog high life, let us not go into the question now, because the flexible of potassium steel own is good, the carrying sclerosis is high, advantages such as wearability is good, thereby can think eliminated such as loose, crystal grain and field trash is thick and casting flaw such as composition microstructure segregation after, the serviceability of high manganese steel frog will be certain to be greatly enhanced.Therefore, in order to eliminate the casting flaw of potassium steel, so that can bring into play the performance advantage of potassium steel fully, the production method that exploitation makes new advances is necessary fully.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the objective of the invention is at the selection of existing assembled frog central track and the drawback of production method, on production method and technology, it is improved, propose a kind of the potassium steel ingot casting to be heated, forge (rolling), behind the forging molding and heat treatment of certain deflection, through a spot of machining, be processed into the process of high manganese steel frog heart rail again.Because this method greatly reduces the casting flaw of the high manganese steel frog heart rail that is obtained, thereby will be greatly enhanced the service life of the performance of potassium steel and assembled frog.
Technical solution of the present invention is achieved in that a kind of casting (rolling) production method of high manganese steel frog heart rail, it is characterized in that comprising steps A make common potassium steel or through the potassium steel ingot casting of alloying, step B with the ingot casting heating after, adopt open die forging, die forging and/or rolling method to carry out forging molding, the step C blank after with forging molding and directly carry out the tough processing of water or after forging, reheat carrying out the tough processing of water and step D is machined into high manganese steel frog heart rail at last.
Beginning forging (rolling) temperature of described step B≤1350 ℃, finish-forging (rolling) temperature 〉=900 ℃; The arbitrary value of forging ratio in 1.5～10.0 scopes.
Described step C directly carries out rough forging the tough processing of water or reheats after forging in 900 ℃～1250 ℃ scopes carrying out the tough processing of water after finish-forging (rolling) finishes.
Described common potassium steel or can be the potassium steel of defined in the national standard (GB/T 5680-1998) and the potassium steel of using a kind of and/or its composite alloying in chromium, molybdenum, nickel, titanium, vanadium, boron, aluminium, nitrogen, niobium and the rare earth element on this basis through the potassium steel of alloying.
Described high manganese steel frog heart rail can be the heart rail in the assembled frog or the fork heart in the heart rail.
Described casting steel ingot can be the ingot casting that routine casting production method or special method for casting production are produced.
The present invention compares with existing casting high manganese steel frog heart rail, has the advantage of mechanical performance and high life; And compare with alloy steel core rail, not only in mechanical performance, particularly be not less than on service life or even surpass alloy steel core rail, but also have advantages such as with low cost, that production technology is simple.
The specific embodiment
The specific embodiment of the present invention is as follows:
Embodiment 1: at first water and outpour the potassium steel ingot casting that weight is about 450 kilograms of general chemistry compositions.The potassium steel ingot casting is slowly carried out the rough forging that No. 12 combined frog crossing point rails are processed in flat-die forging after the heating, and its initial forging temperature is 1200 ℃, and forging ratio is 3.5, and final forging temperature is not less than 950 ℃.After finishing, forging directly carries out the tough processing of water.Be machined into high manganese steel frog heart rail at last.
Embodiment 2: at first water and outpour potassium steel heart rail cast blank.Its chemical composition is on the basis of common potassium steel chemical composition, added 2% chromium and 0.2% rare earth alloy by weight percentage.Strand is slowly carried out forging in the mould after the heating, be processed into the rough forging of No. 12 combined frog crossing point rails, its initial forging temperature is 1200 ℃, and final forging temperature is not less than 950 ℃.After finishing, forging directly carries out the tough processing of water.Be machined into the speed-raising combined frog crossing point rail at last No. 12.
Embodiment 3: at first water and outpour weight and be about 3000 kilograms of general chemistry composition potassium steel ingot castings.Strand slowly is rolled into the strip plate that cross sectional dimensions is about 180mm * 160mm after the heating, and it is 1250 ℃ that its beginning is rolled temperature, and rolling forging ratio is about 8, and finishing temperature is not less than 900 ℃.The rolling slowly cool to room temperature of back that finishes.After strip plate is cut into pieces by the about 1040mm of length, reheat 1020 ℃ of insulations again and carry out the tough processing of water after 1.5 hours.Be machined into the assembled frog fork heart at last No. 12.
Utilize the high manganese steel frog heart rail that the technology of the present invention obtains because picture is loose, crystal grain and field trash is thick and composition microstructure segregation etc. casting flaw obtained eliminating or minimizing, thereby its performance all will be improved.Particularly the amplitude that improves of the low-temperature impact toughness under the bending strength ,-40 ℃ is the most obvious.Compare with casting potassium steel, its bending strength and low-temperature impact toughness can improve 55%-65% and 100%-200% respectively.Owing to forge the high manganese steel frog heart rail performance advantage of potassium steel is brought into play fully, thereby can be greatly improved its service life.Adopt assembled frog that the embodiment of the invention one technological means produces at the scene during practical application, reached 2.9 hundred million tons of throughputs its service life.
Claims (6)
1, a kind of forging (rolling) production method of high manganese steel frog heart rail, it is characterized in that comprising steps A make common potassium steel or through the potassium steel ingot casting of alloying, step B with the ingot casting heating after, adopt open die forging, die forging and/or rolling method to carry out forging molding, the step C blank after with forging molding and when forging finishes, directly carry out the tough processing of water or after forging, reheat carrying out the tough processing of water and step D is machined into high manganese steel frog heart rail at last.
2, forging (rolling) production method of high manganese steel frog heart rail according to claim 1, the beginning that it is characterized in that described step B is forged (rolling) temperature≤1350 ℃, finish-forging (rolling) temperature 〉=900 ℃; The arbitrary value of forging ratio in 1.5～10.0 scopes.
3, forging (rolling) production method of high manganese steel frog heart rail according to claim 1 and 2 is characterized in that described step C directly carries out rough forging the tough processing of water or reheat in 900 ℃～1250 ℃ temperature ranges carrying out the tough processing of water after finish-forging (rolling) finishes after forging.
4, forging (rolling) production method of high manganese steel frog heart rail according to claim 1 and 2 is characterized in that described common potassium steel or can be the potassium steel of defined in the national standard (GB/T5680-1998) and the potassium steel of using a kind of or its composite alloying in chromium, molybdenum, nickel, titanium, vanadium, boron, aluminium, nitrogen, niobium and the rare earth element on this basis through the potassium steel of alloying.
5, forging (rolling) production method of high manganese steel frog heart rail according to claim 1 and 2; It is characterized in that described high manganese steel frog heart rail can be the heart rail in the assembled frog or the fork heart in the heart rail.
6, forging (rolling) production method of high manganese steel frog heart rail according to claim 1; It is characterized in that described casting steel ingot can be the ingot casting that routine casting production method or special method for casting production are produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101139525A CN100484701C (en) | 2005-10-17 | 2005-10-17 | Forging (rolling) manufacture method of high-manganese steel frog centering rail |
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| CNB2005101139525A CN100484701C (en) | 2005-10-17 | 2005-10-17 | Forging (rolling) manufacture method of high-manganese steel frog centering rail |
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| CN1745963A true CN1745963A (en) | 2006-03-15 |
| CN100484701C CN100484701C (en) | 2009-05-06 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463992C (en) * | 2007-06-12 | 2009-02-25 | 燕山大学 | Forged (rolled) abrasive austenic permanganic steel and its manufacture |
| CN103266214A (en) * | 2013-06-14 | 2013-08-28 | 莱芜钢铁集团有限公司 | Online high manganese steel toughening heat treatment method |
| CN104160058A (en) * | 2012-01-25 | 2014-11-19 | 塔塔钢铁英国有限公司 | Steel for producing parts for railway, railway crossings and switches and method for producing said parts |
| CN104499382A (en) * | 2014-12-23 | 2015-04-08 | 中铁宝桥集团有限公司 | Combined frog of forged high-manganese-steel point rail |
| CN107190199A (en) * | 2017-04-24 | 2017-09-22 | 宝鸡比优特材料有限公司 | Rolling stock potassium steel cartridge abrasion disc and its forging method |
| CN108097855A (en) * | 2017-12-21 | 2018-06-01 | 清华大学 | A kind of railway frog solid forging method |
| CN111618215A (en) * | 2019-02-28 | 2020-09-04 | 浙江德盛铁路器材股份有限公司 | Integrated forming processing technology of variable cross-section parts |
| CN113462991A (en) * | 2021-06-04 | 2021-10-01 | 中铁宝桥集团有限公司 | Forging or rolling process of alloyed high manganese steel frog |
| CN117344230A (en) * | 2023-10-08 | 2024-01-05 | 燕山大学 | High manganese steel for split frog core rail and wing rail mosaic blocks and application thereof |
-
2005
- 2005-10-17 CN CNB2005101139525A patent/CN100484701C/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463992C (en) * | 2007-06-12 | 2009-02-25 | 燕山大学 | Forged (rolled) abrasive austenic permanganic steel and its manufacture |
| CN104160058A (en) * | 2012-01-25 | 2014-11-19 | 塔塔钢铁英国有限公司 | Steel for producing parts for railway, railway crossings and switches and method for producing said parts |
| CN103266214A (en) * | 2013-06-14 | 2013-08-28 | 莱芜钢铁集团有限公司 | Online high manganese steel toughening heat treatment method |
| CN103266214B (en) * | 2013-06-14 | 2015-07-01 | 莱芜钢铁集团有限公司 | Online high manganese steel toughening heat treatment method |
| CN104499382A (en) * | 2014-12-23 | 2015-04-08 | 中铁宝桥集团有限公司 | Combined frog of forged high-manganese-steel point rail |
| CN107190199A (en) * | 2017-04-24 | 2017-09-22 | 宝鸡比优特材料有限公司 | Rolling stock potassium steel cartridge abrasion disc and its forging method |
| CN108097855A (en) * | 2017-12-21 | 2018-06-01 | 清华大学 | A kind of railway frog solid forging method |
| CN108097855B (en) * | 2017-12-21 | 2019-07-12 | 清华大学 | A kind of railway frog solid forging method |
| CN111618215A (en) * | 2019-02-28 | 2020-09-04 | 浙江德盛铁路器材股份有限公司 | Integrated forming processing technology of variable cross-section parts |
| CN113462991A (en) * | 2021-06-04 | 2021-10-01 | 中铁宝桥集团有限公司 | Forging or rolling process of alloyed high manganese steel frog |
| CN117344230A (en) * | 2023-10-08 | 2024-01-05 | 燕山大学 | High manganese steel for split frog core rail and wing rail mosaic blocks and application thereof |
| CN117344230B (en) * | 2023-10-08 | 2024-05-17 | 燕山大学 | High manganese steel for split frog core rail and wing rail mosaic blocks and application thereof |
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|---|---|
| CN100484701C (en) | 2009-05-06 |
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