JPH04136117A - Method for restraining decarbonization in high carbon chromium bearing steel - Google Patents
Method for restraining decarbonization in high carbon chromium bearing steelInfo
- Publication number
- JPH04136117A JPH04136117A JP26019590A JP26019590A JPH04136117A JP H04136117 A JPH04136117 A JP H04136117A JP 26019590 A JP26019590 A JP 26019590A JP 26019590 A JP26019590 A JP 26019590A JP H04136117 A JPH04136117 A JP H04136117A
- Authority
- JP
- Japan
- Prior art keywords
- annealing
- annealing furnace
- decarburization
- spheroidized
- furnace
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims description 9
- 238000005262 decarbonization Methods 0.000 title 1
- 230000000452 restraining effect Effects 0.000 title 1
- 238000000137 annealing Methods 0.000 claims abstract description 55
- 238000005255 carburizing Methods 0.000 claims abstract description 10
- 238000005261 decarburization Methods 0.000 claims description 36
- 238000011282 treatment Methods 0.000 abstract description 18
- 229910052799 carbon Inorganic materials 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract 3
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 239000010410 layer Substances 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、高炭素クロム軸受鋼をｔｙ状化焼鈍する際
に生ずる脱炭を抑制する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for suppressing decarburization that occurs when high carbon chromium bearing steel is annealed to form a tye.
（従来の技術）
軸受の転動体のように、転がり摩擦をうけ、耐摩耗性が
要求される機械構造用鋼は、表層に浸炭等の硬化処理が
施されるが、被処理材の表層に脱炭層があると、焼入れ
時に馴れを口１ニジたり、使用時に転勤疲労による寿命
の低下を招く。そのため、脱炭層を極力少なくする必要
がある。(Prior art) Steel for machine structures, which is subject to rolling friction and is required to have wear resistance, such as the rolling elements of bearings, is subjected to hardening treatments such as carburizing on the surface layer. If there is a decarburized layer, it will cause bending during quenching and a shortened life due to transfer fatigue during use. Therefore, it is necessary to reduce the decarburized layer as much as possible.
例えば、ＪＩＳ Ｇ ４８０５のＳＵＪ ２で代表され
る高炭素クロム軸受鋼は、炭化物をｈＨ状化する熱処理
を施すことにより固い鋼表面が得られ、耐摩耗性を有し
、特に転がり軸受用として優れている。この高炭素クロ
ム軸受鋼のＩ；ｙ軟化焼鈍においては、＾１変態点近傍
での長時間処理を要するため、脱炭の抑制には細心の注
意を払うことが必要である。For example, high carbon chromium bearing steel represented by SUJ 2 of JIS G 4805 has a hard steel surface obtained by heat treatment to convert carbides into hH state, has wear resistance, and is particularly suitable for rolling bearings. ing. In the I;y softening annealing of this high carbon chromium bearing steel, a long treatment near the ^1 transformation point is required, so careful attention must be paid to suppressing decarburization.
第１図はこの高炭素クロム軸受鋼を素材とする鋼管、棒
鋼および線材の製造工程で（（ａ）図：鋼管、（【））
図：棒鋼および線材〉、製管の後あるいは熱間で棒や線
に加工した後、いずれも球状化焼鈍処理が施される。こ
れらの材料における通常の許容脱炭Ｎ深さ（以下、脱炭
仕様という）は、鋼管の場合０．２０＋ｍｓ以下、棒鋼
の場合０，４０〜０．５ｑｍｍ以下、線材の場合（線材
を細かく切断し、球加工して鋼球とする場合）０１であ
る。Figure 1 shows the manufacturing process of steel pipes, steel bars, and wire rods made from this high-carbon chromium bearing steel (Figure (a): Steel pipe, ([))]
Figure: Steel bars and wire rods> After pipe production or hot processing into bars and wires, spheroidizing annealing is performed. The normal allowable decarburization N depth (hereinafter referred to as decarburization specifications) for these materials is 0.20+ms or less for steel pipes, 0.40 to 0.5 qmm or less for steel bars, and 0.40 to 0.5 qmm or less for wire rods (after cutting the wire into small pieces). When the ball is processed into a steel ball) 01.
脱炭仕様の厳しい線材の球状化焼鈍においては雰囲気制
御が可能な焼鈍炉が使用され、一方、鋼管と棒鋼の球状
化焼鈍においては直火式焼鈍炉が用いられる。この直火
式焼鈍炉で伎化物の球状化に必要な２４時間程度の球状
化焼鈍を施すと、鋼材の表面から０．３０〜０．４０ｍ
ｍの深さの脱炭が生ずるが、棒鋼の場合はそのままでも
脱炭仕様（０，４０〜０．５０ｍｍ）を満足し、鋼管の
場合でも、冷間圧延（ピルガ−圧延）仕上の鋼管におい
ては、圧延時に肉厚加工度が５０％強となるので、脱炭
層が半減して脱炭仕様（０，２０＋ｕｉ以下）を満足す
る。しかし、冷間引抜仕上の鋼管においては、引抜時の
肉厚加工度が２０％程度と小さいため、球状化焼鈍の際
脱炭を抑制しなければ脱炭仕様を満足することができな
い。Annealing furnaces that can control the atmosphere are used for spheroidizing wire rods with strict decarburization specifications, while direct-fire annealing furnaces are used for spheroidizing steel pipes and bars. When spheroidizing annealing is performed in this direct-fired annealing furnace for about 24 hours, which is necessary for spheroidizing the metal compound, the surface of the steel material can be 0.30 to 0.40 m away from the surface of the steel material.
Decarburization occurs to a depth of 1.5 m, but in the case of steel bars, the decarburization specifications (0.40 to 0.50 mm) are met even if they are made as is, and in the case of steel pipes, the decarburization occurs in cold-rolled (pilger-rolled) finished steel pipes. Since the wall thickness workability during rolling is over 50%, the decarburized layer is halved and satisfies the decarburized specifications (0.20+ui or less). However, in cold-drawn finished steel pipes, the degree of wall thickness reduction during drawing is as small as about 20%, so decarburization specifications cannot be met unless decarburization is suppressed during spheroidizing annealing.
こ゛の問題を回避するには、線材の球状化焼鈍に使用さ
れる雰囲気焼鈍炉の適用が考えられる。しかし、脱炭仕
様の上限を外れた場合は研削などの手段により脱炭層を
除去する作業が必要となり、また逆に浸炭が生した場合
は表層が硬化し引抜時に加工疵が発生する恐れがあるの
で、脱炭層深さが常にＯ〜０．２０ｍｍの範囲に入るよ
うに制御しなければならず、このような制御は実際の製
造現場においては極めて困難である。また、焼鈍炉の全
長を雰囲気炉にしなければならず、多大の設鑞什を要す
るという問題もある。なお、線材は脱炭を極廣に様うの
で雰囲気をｔｌ戻顛向に制御して焼鈍処理を行っている
が、この時浸炭が生しても球加工に支障はない。In order to avoid this problem, it is possible to apply an atmospheric annealing furnace used for spheroidizing annealing of wire rods. However, if the upper limit of the decarburization specifications is exceeded, it will be necessary to remove the decarburized layer by means such as grinding, and conversely, if carburization occurs, the surface layer will harden and there is a risk of machining defects occurring during drawing. Therefore, the depth of the decarburized layer must be controlled so that it always falls within the range of 0 to 0.20 mm, and such control is extremely difficult in actual manufacturing sites. Another problem is that the entire length of the annealing furnace must be an atmosphere furnace, which requires a large amount of equipment. Note that since the wire rod undergoes extreme decarburization, the annealing treatment is performed by controlling the atmosphere to return to tl, but even if carburization occurs at this time, it does not interfere with ball processing.
（発明が解決しようとする！！Ｉ題）
本発明は、高炭素クロム軸受綱を球状化焼鈍するに際し
、冷間引抜仕上の鋼管においても脱炭仕様を満足し、さ
らに厳しい脱炭仕様にも応しることができると共に、安
価な設備構成で実施することのできる脱炭抑制方法を（
に供することを目的とする。(Problem to be solved by the invention!!) The present invention satisfies decarburization specifications even in cold-drawn finished steel pipes when high-carbon chromium bearing steel is annealed to spheroidize, and also meets strict decarburization specifications. We have developed a method for suppressing decarburization that can be implemented with an inexpensive equipment configuration.
The purpose is to serve.
（ｉ！ｉ！題を解決するための手段）
本発明者らは、上記の目的を達成するために種々検討を
重ねた結果、雰１）７１気焼鈍炉による処理と直火式焼
鈍炉による処理を鉗み合わせることにより脱炭層深さを
制御ｎできることを確認した。すなわち、本発明の要旨
は「高炭素クロム軸受鋼を球状化焼鈍する際に、最初Ｃ
ｏ ＣＯｚ ｌｉｔ １ｌｚｏ Ｎｚ系の雰囲
気焼鈍炉で浸炭雰囲気で球状化焼鈍を行い、次いで、直
火式焼鈍炉で球状化焼鈍と浸炭部分のスケールオフを同
時に行うことを特徴とする高炭素クロム軸受鋼の脱炭抑
制方法」にある。(Means for solving the i!i! problem) As a result of various studies in order to achieve the above object, the present inventors found that the following results were obtained: Atmosphere 1) Treatment using a 71-air annealing furnace and treatment using a direct-fired annealing furnace. It was confirmed that the depth of the decarburized layer could be controlled by combining the treatments. That is, the gist of the present invention is that ``When high-carbon chromium bearing steel is annealed to spheroidize, C.
o COz lit 1lzo A high carbon chromium bearing steel characterized by performing spheroidizing annealing in a carburizing atmosphere in a Nz-based atmosphere annealing furnace, and then simultaneously performing spheroidizing annealing and scale-off of the carburized portion in a direct-fired annealing furnace. ``Methods for suppressing decarburization''.
本発明の対象となる高炭素クロム軸受鋼とは、前記（７
）、１１５ Ｇ ４８０５ ニ規定されたＳＵＪ ２
（７）外に、ＳＵＪ Ｌ ＳＵＪ ３〜５など、炭素が
０．９５〜１．１０％程度、クロムが０．９０〜１．６
０％程度含有される鋼で、この外にＮｏ５Ｗ、Ｖ等を必
要に応じて含有する改良鋼種も対象になる。The high carbon chromium bearing steel that is the object of the present invention is the above-mentioned (7
), 115 G 4805 d SUJ 2
(7) In addition, carbon is about 0.95 to 1.10%, and chromium is about 0.90 to 1.6, such as SUJ L SUJ 3 to 5.
Steels that contain approximately 0% of oxidation, and improved steel types that contain No. 5 W, V, etc. as necessary, are also targeted.
処理される時の形態は、通常、圧延のまま、または圧延
後に脱スケールされた棒、線、管などである。When processed, the form is usually a rod, wire, tube, etc., either as rolled or descaled after rolling.
球状化焼鈍処理は、通常用いられる何れの方法でもよい
。The spheroidizing annealing treatment may be performed by any commonly used method.
（作用）
上記のように、高炭素クロム軸受鋼を球状化焼鈍する際
に、最初、雰囲気焼鈍炉を用いて浸炭雰囲気で処理する
ことにより、炭化物を球状化すると同時に材料表面近傍
の脱炭を抑えて逆に浸炭させる０次いで、直火式焼鈍炉
で処理することにより、引き続き炭化物を球状化すると
同時に雰囲気焼鈍炉での処理で生じた浸炭部分をスケー
ルオフする。つまり、熱間で加工された素材は脱炭して
おり、かつ、そのばらつきが大きく、雰囲気焼鈍炉のみ
ではこのばらつきを一定レベルに制ｉ１１することが難
しいが、浸炭雰囲気で処理した後直下炉で長時間の球状
化焼鈍を行うと表面近傍の炭素の拡散が十分進行し脱炭
レヘルを一定に制御することができるのである。このよ
うに、雰囲気ｔＡ純炉による処理と直火式焼鈍炉による
処理を組合ゼることにより、直火式焼鈍炉のみによる処
理のように深い脱炭層を生じさせることなく、また、雰
囲気焼鈍炉のみによる処理の場合よりも容８に、かつ、
安価な設備構成で、高炭素クロム軸受鋼を球状化焼鈍す
る際に生ずる脱炭を抑制することができる。(Function) As mentioned above, when high-carbon chromium bearing steel is annealed to spheroidize, it is first treated in a carburizing atmosphere using an atmospheric annealing furnace, thereby spheroidizing carbides and simultaneously decarburizing the material near the surface. Then, by processing in a direct-fired annealing furnace, the carbide is successively spheroidized, and at the same time, the carburized portion produced by the treatment in the atmosphere annealing furnace is scaled off. In other words, hot-processed materials are decarburized and have large variations in decarburization, and it is difficult to control these variations to a constant level using only an atmosphere annealing furnace, but after processing in a carburizing atmosphere, When spheroidizing annealing is performed for a long time, carbon diffusion near the surface progresses sufficiently and the decarburization level can be controlled at a constant level. In this way, by combining the treatment in the atmosphere tA pure furnace and the treatment in the direct-fired annealing furnace, a deep decarburized layer is not generated unlike in the case of treatment in the direct-fired annealing furnace alone. 8 more than in the case of treatment only, and
With an inexpensive equipment configuration, it is possible to suppress decarburization that occurs when high carbon chromium bearing steel is annealed to form a spheroid.
本発明の脱炭抑制方法において、ｃｏ −ｃｏ□−Ｉ＋
。In the method for suppressing decarburization of the present invention, co -co□-I+
.
１１□０−Ｎｚ系の雰囲気焼鈍炉を用いるのは雰囲気制
御が容易だからである。すなわち、ｃｏ −ｃｏ。The reason for using a 11□0-Nz atmosphere annealing furnace is that the atmosphere can be easily controlled. That is, co-co.
１１、−ＩＩ！ＯＮｚ系のガスは浸炭性成分（ＣＯ）、
脱炭性成分（Ｃｏｇ）の双方を含み、それらの濃度を変
えて（ＣＯ） ”／Ｃｏ、で表されるＰＰ（ボテンシ十
ルファクター）値を制御することにより雰囲気を脱炭性
、浸炭性のいずれにも制御することができる。11,-II! ONz-based gas contains carburizing components (CO),
Contains both decarburizing components (Cog), and by changing their concentrations and controlling the PP (potency factor) value expressed as (CO) /Co, the atmosphere can be made decarburizing and carburizing. It can be controlled in any of the following ways.
（実施例）
高炭素クロム軸受鋼（ＪＩＳ Ｇ ４８０５の５ＩＪＪ
２ ）を対象（被処理材）として本発明方法を適用し
、球状化焼鈍の際の脱炭抑制効果を調査した。被処理材
は、外径６３．５＋ｎ＋、肉厚５．９＋ｕ＋、長さ１５
ｍの熱間製管ままの材料であり、雰囲気焼鈍炉としては
ハースローラ−形連続焼鈍炉を用い、前記の処理材をハ
ースローラ−上−列に２５本積載して焼鈍処理を行った
。第２図は球状化焼鈍パターンで、雰囲気焼鈍炉で処理
した後、直火式焼鈍炉で処理した。(Example) High carbon chromium bearing steel (JIS G 4805 5IJJ
The method of the present invention was applied to 2) (material to be treated) to investigate the decarburization suppressing effect during spheroidizing annealing. The material to be treated has an outer diameter of 63.5+n+, a wall thickness of 5.9+u+, and a length of 15
The annealing treatment was carried out using a hearth roller type continuous annealing furnace as the atmosphere annealing furnace, with 25 pieces of the treated material loaded on the upper row of hearth rollers. FIG. 2 shows a spheroidizing annealing pattern, which was treated in an atmosphere annealing furnace and then in a direct fire annealing furnace.
第３図は雰囲気焼鈍炉における材料温度およびＰＰ（１
ｉの測定結果の一例である。図中の破線は脱炭、浸炭の
いずれも生しない脱炭抑制効果で、雰囲気ガスのＰＦ（
ｉをこの脱浸炭平１ｉ曲線の示す値より大きくすれば（
同図中の斜線部）、加熱雰囲気は浸炭性になる。Figure 3 shows the material temperature and PP (1
This is an example of a measurement result of i. The broken line in the figure indicates the decarburization suppression effect that neither decarburization nor carburization occurs, and the PF of the atmospheric gas (
If i is made larger than the value shown by this decarburization flat 1i curve, (
(shaded area in the figure), the heating atmosphere becomes carburizing.
第４図は被処理材の外表面近傍の炭素４度をＥＰＭＡ線
分析により測定した結果を示す図で、（ａ）図は熱間製
管まま、働）図はこれを雰囲気焼鈍炉で処理した後、（
Ｃ）図はさらに直火式焼鈍炉で処理した後の測定結果で
ある。この例では、熱間製管ままでは外表面からかなり
の深さまで脱炭が生している（（ａ）図）、雰囲気焼鈍
炉で処理した後は、外表面から約０．１５＋＋ｍの深さ
まで浸炭した（（ｈ）図）、これを直火式焼鈍炉で処理
したところ、外表面近傍の浸炭部分の炭素の拡散とスケ
ールオフにより肉厚方向の炭素濃度の変化がほとんどな
くなり、脱炭が抑制された（（Ｃ）図）。Figure 4 shows the results of measuring the carbon 4 degree near the outer surface of the material to be treated using EPMA line analysis. After that, (
C) The figure shows the measurement results after further treatment in a direct-fired annealing furnace. In this example, decarburization occurs to a considerable depth from the outer surface when the tube is hot-made (Figure (a)), but after being treated in an atmosphere annealing furnace, decarburization occurs to a depth of about 0.15++ m from the outer surface. When this carburized (figure (h)) was treated in a direct-fire annealing furnace, the carbon concentration in the thickness direction almost disappeared due to carbon diffusion and scale-off in the carburized part near the outer surface, indicating that decarburization occurred. suppressed ((C) figure).
第５図は被処理材をｆｙ状化焼鈍した後の外表面近傍に
おける脱炭分布を示す聞で、（８１図は本発明例、（ｂ
１図は直火式焼鈍炉による処理のみを行った場合の比較
例である。なお、脱炭深さの測定は光学顕微鏡により行
った。Figure 5 shows the decarburization distribution in the vicinity of the outer surface after the material to be treated is annealed to form fy (Figure 81 is the example of the present invention, (b
Figure 1 shows a comparative example in which only a direct-fired annealing furnace was used. Note that the decarburization depth was measured using an optical microscope.
この図から、脱炭深さの平均値は、比較例では０、１７
ｍｍであったのに対し、本発明例では０．０５ｍ−で、
本発明方法の適用にまり脱炭が（…制されでいることが
わかる。From this figure, the average value of decarburization depth is 0, 17 in the comparative example.
mm, whereas in the example of the present invention it was 0.05 m-,
It can be seen that decarburization was suppressed by applying the method of the present invention.
（発明の効果）
高炭素クロム軸受鋼の球状化焼鈍処理において、本発明
方法を適用することにより脱炭を抑制することができる
。これによって、冷間引抜仕上の鋼管においても脱炭仕
様を満たすことができ、さらに厳しい脱炭仕様にも追随
可能となるため、ユーザー側での切削代低減によるコス
ト合理化にも貢献できる。(Effects of the Invention) Decarburization can be suppressed by applying the method of the present invention in the spheroidizing annealing treatment of high carbon chromium bearing steel. As a result, it is possible to meet decarburization specifications even for cold-drawn finished steel pipes, and it is also possible to follow even stricter decarburization specifications, contributing to cost rationalization by reducing cutting allowances on the user side.
第１［ｆｆｌは、高炭素クロム軸受鋼の製造工稈図で、
（ａ）図は鋼管の場合、働）図は棒鋼および線材の場合
である。
第２図は、実施例で用いた球状化焼鈍パターンを示す図
である。
第３図は、雰囲気焼鈍炉における材料温度およびＰＦ４
ＩＬの測定例を示す図である。
第４図は、被処理材の外表面近傍における炭素濃度を表
す図で、（ａ） １ｍは熱間製管まま、（ト））図は雰
囲気焼鈍炉で処理した後、（Ｃ）図は直火式焼鈍炉で処
理した後である。
第５回は、高炭素り１］ム軸受鋼の球状化焼８屯後の脱
炭分布を示す図である。
出願人 住友金属工業株式会ン１The first [ffl is a manufacturing process diagram for high carbon chromium bearing steel,
The figure (a) shows the case of steel pipes, and the figure (work) shows the case of steel bars and wire rods. FIG. 2 is a diagram showing a spheroidizing annealing pattern used in Examples. Figure 3 shows the material temperature and PF4 in the atmosphere annealing furnace.
It is a figure which shows the example of a measurement of IL. Figure 4 shows the carbon concentration in the vicinity of the outer surface of the material to be treated. This is after being processed in a direct-fired annealing furnace. The fifth is a diagram showing the decarburization distribution of high carbon 1]um bearing steel after 8 tons of spheroidizing and sintering. Applicant: Sumitomo Metal Industries, Ltd. 1
Claims (1)
ＣＯ＿２−Ｈ＿２−Ｈ＿２Ｏ−Ｎ＿２系の雰囲気焼鈍炉
で浸炭雰囲気で球状化焼鈍を行い、次いで、直火式焼鈍
炉で球状化焼鈍と浸炭部分のスケールオフを同時に行う
ことを特徴とする高炭素クロム軸受鋼の脱炭抑制方法。When high carbon chromium bearing steel is annealed to spheroidize, CO-
A high carbon chromium product characterized by performing spheroidizing annealing in a carburizing atmosphere in a CO_2-H_2-H_2O-N_2 system atmosphere annealing furnace, and then simultaneously performing spheroidizing annealing and scale-off of the carburized part in a direct-fired annealing furnace. Method for suppressing decarburization of bearing steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2260195A JPH0737645B2 (en) | 1990-09-27 | 1990-09-27 | Decarburization suppression method for high carbon chrome bearing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2260195A JPH0737645B2 (en) | 1990-09-27 | 1990-09-27 | Decarburization suppression method for high carbon chrome bearing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04136117A true JPH04136117A (en) | 1992-05-11 |
| JPH0737645B2 JPH0737645B2 (en) | 1995-04-26 |
Family
ID=17344654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2260195A Expired - Fee Related JPH0737645B2 (en) | 1990-09-27 | 1990-09-27 | Decarburization suppression method for high carbon chrome bearing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0737645B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040011789A (en) * | 2002-07-30 | 2004-02-11 | 양재봉 | Handle for elastic folded body |
| JP2009285698A (en) * | 2008-05-30 | 2009-12-10 | Sanyo Special Steel Co Ltd | Method of manufacturing bar steel |
| WO2012081229A1 (en) | 2010-12-13 | 2012-06-21 | 住友金属工業株式会社 | High-carbon chromium bearing steel, and process for production thereof |
| CN116065006A (en) * | 2022-11-29 | 2023-05-05 | 无锡普天铁心股份有限公司 | Gradient decarburization annealing method for improving surface quality of secondary cold-rolled oriented silicon steel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6620262B1 (en) | 1997-12-26 | 2003-09-16 | Nsk Ltd. | Method of manufacturing inner and outer races of deep groove ball bearing in continuous annealing furnace |
| JP5786764B2 (en) * | 2012-03-06 | 2015-09-30 | 新日鐵住金株式会社 | Manufacturing method of high carbon chromium bearing steel |
| CN103940704A (en) * | 2014-04-21 | 2014-07-23 | 河北工程大学 | Method for determining high temperature solid carbon diffusion coefficient of SCM435 steel |
-
1990
- 1990-09-27 JP JP2260195A patent/JPH0737645B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040011789A (en) * | 2002-07-30 | 2004-02-11 | 양재봉 | Handle for elastic folded body |
| JP2009285698A (en) * | 2008-05-30 | 2009-12-10 | Sanyo Special Steel Co Ltd | Method of manufacturing bar steel |
| WO2012081229A1 (en) | 2010-12-13 | 2012-06-21 | 住友金属工業株式会社 | High-carbon chromium bearing steel, and process for production thereof |
| JP5093410B2 (en) * | 2010-12-13 | 2012-12-12 | 住友金属工業株式会社 | High carbon chromium bearing steel and manufacturing method thereof |
| US8808470B2 (en) | 2010-12-13 | 2014-08-19 | Nippon Steel & Sumitomo Metal Corporation | High-carbon chromium bearing steel and production method of the same |
| CN116065006A (en) * | 2022-11-29 | 2023-05-05 | 无锡普天铁心股份有限公司 | Gradient decarburization annealing method for improving surface quality of secondary cold-rolled oriented silicon steel |
| CN116065006B (en) * | 2022-11-29 | 2023-08-22 | 无锡普天铁心股份有限公司 | Gradient decarburization annealing method for improving surface quality of secondary cold-rolled oriented silicon steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0737645B2 (en) | 1995-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1999034023A1 (en) | Continuous annealing furnace, rolling bearing, annealing method, and method of manufacturing inner and outer races of deeply groove ball bearing | |
| EP2653569B1 (en) | High-carbon chromium bearing steel, and process for production thereof | |
| JP2000239744A (en) | Heat treatment method for hollow cylindrical work | |
| JPH04136117A (en) | Method for restraining decarbonization in high carbon chromium bearing steel | |
| JP6237459B2 (en) | Heat treatment method for steel pipe and method for producing steel pipe for bearing using the same | |
| JP2015531029A (en) | Method for heat treating steel components and steel components | |
| JP2007119865A (en) | Steel tube for machine structural member, and production method therefor | |
| CN111876677B (en) | Forming process of hexagonal alloy tool steel S2 | |
| EP1524323B1 (en) | Process for producing oil tempered wire | |
| JPH04168221A (en) | Manufacture of austenitic stainless seamless steel tube | |
| JPH06145793A (en) | Method for preventing decarburization of seamless steel tube | |
| EP1795274B1 (en) | METHOD FOR HOT WORKING OF Cr-CONTAINING STEEL | |
| JPH11279781A (en) | Production of austenitic stailness steel plate not having pattern on surface | |
| JP2705382B2 (en) | Pretreatment of pickling of steel pipes for bearings | |
| JPH0578734A (en) | Method for preventing decarburization on inside face of steel tube | |
| KR102309003B1 (en) | Cementation heat treatment method for steel and manufactured steel by the same | |
| JPH08269619A (en) | High carbon hot rolled steel sheet excellent in hardenability and cold workability | |
| JP2000192147A (en) | Directly spheroidized annealing method of low alloy wire rod | |
| JP3167550B2 (en) | Cold forging steel with excellent workability | |
| RU2491358C1 (en) | Method for production of rolled wire | |
| JPS589917A (en) | Preventing method for decarburization in heating stage of steel ingot | |
| JPH0436420A (en) | Production of high tensile strength wire | |
| CN113981186A (en) | Atmosphere protection heat treatment process for preventing decarbonization and recarburization | |
| JP2003027144A (en) | Recarburizing method of ring cut out of high-carbon chromium bearing steel tube | |
| JP3095913B2 (en) | Continuous annealing method for metal strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080426 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090426 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100426 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |