JPS62211324A - Heat treatment of top of alloy steel rail end - Google Patents
Heat treatment of top of alloy steel rail endInfo
- Publication number
- JPS62211324A JPS62211324A JP5256986A JP5256986A JPS62211324A JP S62211324 A JPS62211324 A JP S62211324A JP 5256986 A JP5256986 A JP 5256986A JP 5256986 A JP5256986 A JP 5256986A JP S62211324 A JPS62211324 A JP S62211324A
- Authority
- JP
- Japan
- Prior art keywords
- rail
- cooling
- heat treatment
- alloy steel
- heating device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 229910000851 Alloy steel Inorganic materials 0.000 title claims description 12
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 9
- 229910001563 bainite Inorganic materials 0.000 abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は合金鋼軌条の端頭部を熱処理する方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for heat treating the end head of an alloy steel rail.
合金鋼軌条（例えば、炭素０．７５〜０．７９％、マン
ガン０．６５〜１．４０％、クロム０．５３〜０．６８
％含有）は耐摩耗性、耐損傷性及び溶接性に優れている
が、その熱処理方法は極めて難かしいとされており、従
来は、加熱後の冷却に際しては、１個のエアノズルを用
いて軌条の端頭部は勿論、該軌条の端部まで冷却してい
た。Alloy steel rail (e.g. carbon 0.75-0.79%, manganese 0.65-1.40%, chromium 0.53-0.68
% content) has excellent wear resistance, damage resistance, and weldability, but its heat treatment method is considered to be extremely difficult. Conventionally, when cooling after heating, a single air nozzle was used to Not only the end head but also the end of the rail was cooled.
然し乍ら１合金鋼軌条は焼入性がよいので、その熱処理
に際しては１通常の軌条のそれより冷却速度を遅くして
冷却する必要がある。その理由は、通常の焼入方法では
軌条端部の冷却速度が速過ぎて、該端部にベーナイトが
生じ易いからであり、端部にベーナイトが生じないよう
な、該端部に適合した冷却速度で冷却すると、定常部の
硬度が規定値に達しないという問題点があり、また、軌
条端部に直接冷却剤をかけると、該端部に異常組織や硬
度異常等が生じるという問題点もあるのである。However, since the 1 alloy steel rail has good hardenability, it is necessary to cool it at a slower cooling rate than that of a normal 1 rail when heat treating it. The reason for this is that in the normal hardening method, the cooling rate at the end of the rail is too fast and bainite is likely to form at the end. When cooled at a high speed, there is a problem that the hardness of the stationary part does not reach the specified value, and when the coolant is applied directly to the end of the rail, there is also the problem that abnormal structures and hardness abnormalities occur at the end. There is.
本発明は上述のような従来技術の問題点を解決し、合金
鋼軌条の端頭部を良好に熱処理することの出来る方法を
提供することを目的としてなされたもので、その構成は
１合金鋼軌条の端頭部を熱処理するに際し、加熱装置の
後に２連のエアノズルから成る冷却装置を配し、前記加
熱装置を軌条の端頭部上適宜の箇所から移動させながら
該軌条頭部を加熱した後、前記冷却装置により冷却する
ようにし、加熱装置が軌条端部を通過したら、前記冷却
装置をその先端部が軌条端部と揃ったところで停止し、
保持冷却を行なうことを特徴とするものである。The present invention has been made for the purpose of solving the above-mentioned problems of the prior art and providing a method that can satisfactorily heat treat the end head of an alloy steel rail. When heat-treating the end head of the rail, a cooling device consisting of two air nozzles was arranged after the heating device, and the heating device was moved from an appropriate location on the end head of the rail to heat the rail head. After that, the heating device is cooled by the cooling device, and when the heating device passes the rail end, the cooling device is stopped when the tip thereof is aligned with the rail end,
It is characterized by performing holding cooling.
即ち１本発明は、合金鋼軌条の端頭部を熱処理するに際
して、従来は加熱装置の後にエアによる冷却装置を１個
配して、それら加熱装置と冷却装置とを、軌条端頭部上
を移動させて熱処理していたものを、加熱装置の後にエ
アによる冷却装置を２連配してそれら加熱装置と冷却装
置を前記と同様に移動させて熱処理するのであるが、加
熱装置が軌条端部を通過し、冷却装置の先端部が軌条端
部と一線に揃ったところで冷却装置の移動を停止し、そ
のままの状態で保持冷却を行なうことにより、軌条端部
にベーナイトを生じさせることなく定常部の硬度が規定
値に達するように熱処理するのである。That is, one aspect of the present invention is that when heat treating the end head of an alloy steel rail, conventionally one air cooling device is disposed after the heating device, and the heating device and the cooling device are connected to the end head of the rail. The material that was previously heat-treated by moving is now heat-treated by placing two air cooling devices in succession after the heating device, and then moving the heating device and cooling device in the same manner as described above. The movement of the cooling device is stopped when the tip of the cooling device is in line with the end of the rail, and cooling is performed in that state. By doing so, the stationary section is maintained without causing bainite at the end of the rail. The material is heat treated so that its hardness reaches a specified value.
次に本発明の実施の一例を図に拠り説明する。 Next, an example of implementation of the present invention will be explained with reference to the drawings.
■は合金鋼から成る軌条、 ｌａはその頭部、１ｂは同
じく端部、Ｈは高周波誘導子から成る鞍型の加熱装置、
Ｑは２連のエアノズルＱｌ、 Ｑ２から成る冷却装置で
、軌条ｌの熱処理に際しては、加熱装置Ｈを該軌条１頭
部の熱処理開始位置に配置させると共に冷却装置！Ｑを
その後に配置させ、該位置から軌条ｌの端部１ｂに向け
、前記加熱装［Ｈと冷却装置Ｑを移動させながら、加熱
装［Ｈにより軌条頭部１ａを加熱すると共に加熱部分を
冷却装置Ｑにより冷却することにより徐々に熱処理して
行くのであるが、加熱装置Ｈが軌条端部１ｂを通過して
冷却装置ｉ！ＩＱの前方のエアノズ・ルＱ１の先端部が
軌条端部１ｂと一線に揃ったところで、冷却袋５ＷＱの
移動を停止し、そのままの状態で所定の時間保持冷却を
行なうのである。■ is a rail made of alloy steel, la is its head, 1b is the same end, H is a saddle-shaped heating device made of a high frequency inductor,
Q is a cooling device consisting of two air nozzles Ql and Q2, and when heat treating the rail 1, the heating device H is placed at the heat treatment start position of the head of the rail 1, and the cooling device! Q is placed after that, and while moving the heating device [H] and the cooling device Q from this position toward the end 1b of the rail l, the heating device [H heats the rail head 1a and cools the heated portion. The heat treatment is gradually carried out by cooling with the device Q, but the heating device H passes through the rail end portion 1b and the cooling device i! When the tip of the air nozzle Q1 in front of the IQ is aligned with the rail end 1b, the movement of the cooling bag 5WQ is stopped and cooling is carried out for a predetermined period of time in that state.
尚、上記実施例においては、加熱装置Ｈに高周波誘導子
を用い、冷却袋［ＩＱにエアノズルを用いたが、本発明
はそれらに限られることなく、他の適宜のものを用いて
もよい。In the above embodiment, a high frequency inductor was used for the heating device H, and an air nozzle was used for the cooling bag [IQ, but the present invention is not limited to these, and other suitable devices may be used.
実際に、炭素０．７２％、マンガン１．２０％を含有す
る合金鋼から成る合金鋼軌条を、上記の方法で下記の条
件により熱処理した。Actually, an alloy steel rail made of alloy steel containing 0.72% carbon and 1.20% manganese was heat-treated by the above method under the following conditions.
加熱温度 １１８１℃
移動速度 １．７ｍｍ／ｓｅｅ冷却速度
１．２℃／ｓｅｃ
保持冷却時間 ６０ ｓｅｃ
この結果、熱処理された軌条の端部にはベーナイトが生
じなかったし、また、定常部の硬度は規定値に達してお
り、更に、軌条端部に異常組織や硬度異常も生じなかっ
た。Heating temperature 1181℃ Movement speed 1.7mm/see Cooling speed
1.2°C/sec Holding cooling time 60 sec As a result, no bainite was formed at the end of the heat-treated rail, and the hardness of the stationary part reached the specified value. No abnormal tissue or hardness was observed.
尚、上部における測温位虐は深さ５ｎｅ、軌条端面から
の距離５０ｍｍで、測温手段はＣＡ熱電対を用いた。The temperature measurement at the upper part was at a depth of 5 mm and a distance of 50 mm from the rail end surface, and a CA thermocouple was used as the temperature measurement means.
本発明は上述の通りであるから、合金鋼軌条端部の熱処
°理方法として好適である。Since the present invention is as described above, it is suitable as a method for heat treating end portions of alloy steel rails.
図は本発明方法の実施の一例を示すもので、第１図は熱
処理を開始する状態の側面図、第２図は加熱装置が軌条
端部を通過した後、保持冷却を行なっている状態の側面
図である。
ｌ・・・合金−軌条、 ｌａ・・・軌条頭部、■ｂ・・
・軌条端部、Ｈ・・・加熱装置、Ｑ・・・冷却装置、
Ｑｌ、 Ｑ２・・・エアノズルThe figures show an example of the implementation of the method of the present invention. Figure 1 is a side view of the state where heat treatment is started, and Figure 2 is a side view of the state where the heating device is performing cooling after passing through the end of the rail. FIG. l...alloy-rail, la...rail head, ■b...
・Rail end, H... heating device, Q... cooling device,
Ql, Q2...Air nozzle
Claims (1)
の後に２連のエアノズルから成る冷却装置を配し、前記
加熱装置を軌条の端頭部上適宜の箇所から移動させなが
ら該軌条頭部を加熱した後、前記冷却装置により冷却す
るようにし、加熱装置が軌条端部を通過したら、前記冷
却をその先端部が軌条端部と揃ったところで停止し、保
持冷却を行なうことを特徴とする合金鋼軌条端頭部の熱
処理方法。1. When heat-treating the end head of an alloy steel rail, a cooling device consisting of two air nozzles is placed after the heating device, and the heating device is moved from an appropriate location on the end head of the rail. is heated and then cooled by the cooling device, and when the heating device passes the rail end, the cooling is stopped when the tip is aligned with the rail end to perform holding cooling. Heat treatment method for alloy steel rail end heads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5256986A JPH0235010B2 (en) | 1986-03-12 | 1986-03-12 | GOKINKOKIJOTANTOBUNONETSUSHORIHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5256986A JPH0235010B2 (en) | 1986-03-12 | 1986-03-12 | GOKINKOKIJOTANTOBUNONETSUSHORIHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62211324A true JPS62211324A (en) | 1987-09-17 |
| JPH0235010B2 JPH0235010B2 (en) | 1990-08-08 |
Family
ID=12918435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5256986A Expired - Lifetime JPH0235010B2 (en) | 1986-03-12 | 1986-03-12 | GOKINKOKIJOTANTOBUNONETSUSHORIHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0235010B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468428A (en) * | 2018-12-17 | 2019-03-15 | 包头钢铁（集团）有限责任公司 | The method of phosphorus content in a kind of tough Properties of Heavy Rail Steel of converter control height |
-
1986
- 1986-03-12 JP JP5256986A patent/JPH0235010B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468428A (en) * | 2018-12-17 | 2019-03-15 | 包头钢铁（集团）有限责任公司 | The method of phosphorus content in a kind of tough Properties of Heavy Rail Steel of converter control height |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0235010B2 (en) | 1990-08-08 |
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