JPS63290218A - Manufacture of spheroidal graphite cast iron - Google Patents
Manufacture of spheroidal graphite cast ironInfo
- Publication number
- JPS63290218A JPS63290218A JP12656087A JP12656087A JPS63290218A JP S63290218 A JPS63290218 A JP S63290218A JP 12656087 A JP12656087 A JP 12656087A JP 12656087 A JP12656087 A JP 12656087A JP S63290218 A JPS63290218 A JP S63290218A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- spheroidal graphite
- hot water
- graphite cast
- temperature
- 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.)
- Pending
Links
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 239000002562 thickening agent Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims description 32
- 230000009466 transformation Effects 0.000 claims description 25
- 229910001563 bainite Inorganic materials 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 8
- 238000010791 quenching Methods 0.000 abstract description 6
- 230000000171 quenching effect Effects 0.000 abstract description 6
- 229910001566 austenite Inorganic materials 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 229910001562 pearlite Inorganic materials 0.000 abstract description 5
- 229910000734 martensite Inorganic materials 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract 7
- 238000012986 modification Methods 0.000 abstract 7
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000005279 austempering Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007531 graphite casting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008531 maintenance mechanism Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- -1 polyoxyethylene-propylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野：
本発明はＡｌ変態温度以上に加熱されてオーステナイト
組織となった球状黒鉛鋳鉄をオーステ／パー処理してベ
イナイト組織にする製造方法の改良に関するものである
。[Detailed Description of the Invention] Industrial Field of Application: The present invention relates to an improvement in a method for producing spheroidal graphite cast iron, which has been heated above the Al transformation temperature to form an austenitic structure, by subjecting it to auste/par treatment to form a bainite structure. be.
従来の技術と問題点
オーステンパー（ａｕａ−ｔｅｍｐｅｒｉｎｇ ） と
いうのは、被処理鉄屑を加熱してオーステナイト化した
後、ベイナイト生成温度域に保持液、ｍを起こさせ、ベ
イナイト組織とする処理法のことでおる。Conventional Technology and Problems Aua-tempering is a treatment method that creates a bainite structure by heating the iron scrap to be treated and turning it into austenite. That's it.
球状黒鉛鋳鉄（ＪＩＳ Ｇ５５０２−（１９７１）、（
１９８２））にＦＣＤとして記載のものにほぼ該当する
組成のもの）をオーステンパー処理してベーナイト組織
とすることにより、靭性を増加させ、熱処理によるＡ物
の変形を軽減できるなどの効果があることは公知である
。Spheroidal graphite cast iron (JIS G5502-(1971), (
1982))) is subjected to austempering treatment to form a bainite structure, which has the effect of increasing toughness and reducing deformation of Product A due to heat treatment. is publicly known.
従来下記の方法が提案され、または、実施されている。Conventionally, the following methods have been proposed or implemented.
すなわち、被処理鋳鉄を８５０″Ｃ〜９５０’Ｃに加熱
してオーステナイト化した後；
（イ）硝酸塩などの塩浴（Ｍａ温度より高い温度例えば
２６０℃〜６２０ ’Ｃ）により焼入れする。この方法
では、Ｉ４液による公害、作業環境の汚染、１補光の之
め処理コストが高い欠点がるる、っ（→ 塩浴のかわり
に、噴霧水流（高圧空気により水を噴霧化したもの）に
よシ、パーライト変態を起こさぬように高速冷却し、当
温度よシ高い温度で、例えば、流動層炉を用いて、ベイ
マイト変態を起こさせる。この方法の問題点は、形状に
よっては、均一に冷却することが峻しいこと、多数個を
同−伯仲で処理すること、多数の噴４ノズルが水アカな
どによシ詰まらないよう保全することが困難なため大量
生産に適しないことなどでめる〇（ハ）噴霧水流の代わ
りに、水冷・油冷して（ロ）と同様に、力点より高ｉ温
度でベイナイト変態を起こさせる。水冷の場合には、冷
却速度が速すぎるため、被処理品の形状・重量によって
は、短時間でマルテンサイト組織になる可能性があり、
また、冷却の制御が非常に漏しい。油冷の場合、水冷に
比べて、冷却速度が遅くなり制御し易いが、油冷後の被
処理物を流ｍＪ１！Ｊ炉・テンパー炉で恒温変態させる
と、付着した油が燃焼するための炉内が汚れ、かつ、環
境汚染を起こす問題が６９、かつ火災を起こす危険性も
るる。That is, after the cast iron to be treated is heated to 850''C to 950'C to austenitize; (a) quenched in a salt bath such as nitrate (at a temperature higher than Ma temperature, for example, 260 to 620'C).This method However, there are disadvantages such as pollution caused by liquid I4, contamination of the working environment, and high processing costs due to supplementary light. The problem with this method is that depending on the shape, cooling may not be uniform. It is not suitable for mass production because it is difficult to process, it is difficult to process many pieces at the same time, and it is difficult to maintain the large number of four nozzles so that they do not get clogged with water stains. 〇 (c) Instead of spray water flow, use water or oil cooling to cause bainite transformation at a temperature higher than the point of effort, as in (b). In the case of water cooling, the cooling rate is too fast, so Depending on the shape and weight of the product, it may turn into a martensitic structure in a short period of time.
Also, the cooling control is very poor. In the case of oil cooling, compared to water cooling, the cooling rate is slower and easier to control, but the object to be processed after oil cooling is flown mJ1! When constant temperature transformation is carried out in a J furnace or tempering furnace, the inside of the furnace becomes dirty due to the burning of adhering oil, which poses the problem of environmental pollution69 and the risk of fire.
に）Ｍｅ点以上に設定した流動層炉に直接装入する。こ
の方法では、流動層炉の冷却＃は力が小さいため、処理
品肉厚が５ｎ以下の場合金除いてパーライト組織が析出
し易い問題がある。2) Charge directly into a fluidized bed furnace set at Me point or above. In this method, since the cooling force of the fluidized bed furnace is small, there is a problem that pearlite structure tends to precipitate except for gold when the thickness of the processed product is 5 nm or less.
（ホ）球状黒鉛鋳鉄の成分に、Ｃｕ、ｆｆｌｖｉｏ％当
などの合金成分を添加し、材料の焼入れ性を増大して
、に）に記載の流動層炉で処理する。この方法では、合
金成分の添加の念め、製品が高価になる欠点がろる〇
問題点１に解決する手段：
本発明では、Ａｌ変態温度以上に加熱されオーステナイ
ト組織となった被処理球状黒鉛ａ鉄を温水または増粘温
水に浸漬して冷却し、 Ｍｓ温度以上のベイナイト変態
のみが起こる温度域まで冷却し、該温度域に温度保持し
てベイナイト変態を起こさせる。増粘温水とは増粘剤（
粘度向上剤）を添加して増粘した温水を意味する。(E) Alloy components such as Cu and fflvio% are added to the components of spheroidal graphite cast iron to increase the hardenability of the material, and the material is treated in the fluidized bed furnace described in (2). This method has the disadvantage of making the product expensive due to the addition of alloying components.Means for solving problem 1: In the present invention, the treated spheroidal graphite is heated to a temperature higher than the Al transformation temperature and has an austenitic structure. a Iron is immersed in hot water or thickened hot water to cool it to a temperature range above the Ms temperature where only bainite transformation occurs, and the temperature is maintained in this temperature range to cause bainite transformation. What is thickened hot water?Thickening agent (
This refers to hot water that has been thickened by adding a viscosity improver (viscosity improver).
増粘剤としては、５０℃〜１００″Ｃの温水に少量加え
ることによって粘度が増し、しかも粘度の経時変化が少
なく、化学的に安定な物質、例えば、ポリオキシエチレ
ン−プロピレンポリエーテル、ポリエチレングリコール
、部分ケン化ポリビニルアルコール、ポリマレイン化イ
ソブチレンなどを使用することが望ましいが、この発明
は増粘剤の４類に拘らない。Thickeners include substances that increase viscosity by adding a small amount to hot water of 50°C to 100″C, and that have little change in viscosity over time and are chemically stable, such as polyoxyethylene-propylene polyether, polyethylene glycol. Although it is desirable to use partially saponified polyvinyl alcohol, polymaleated isobutylene, etc., the present invention is not limited to class 4 thickeners.
温水あるいは増粘剤を添加した温水冷却器は温水温度の
均一化と処理品の冷却ｔ−促進するために循環を行う。Hot water or a hot water cooler with added thickener is circulated to equalize the temperature of the hot water and to promote cooling of the processed product.
冷却中は冷却初期は速く、後半は遅く冷却するのが望ま
しいため、循環速度も初期は速く、後半は遅くする方が
品質のばらつき金少くできる。During cooling, it is desirable to cool quickly in the initial stage and slowly in the latter half, so if the circulation speed is also fast in the initial stage and slow in the latter half, variations in quality can be reduced.
Ｍｓ温度以上のベイナイト変態のみが起こる温度を保持
する方法として、流動層炉・テンパー炉を用いることが
好ましく、特に前者は被処理物の各位置の温度が均一に
なる点で優れでいる。As a method of maintaining a temperature above the Ms temperature at which only bainite transformation occurs, it is preferable to use a fluidized bed furnace or a tempering furnace, and the former is particularly advantageous in that the temperature at each location of the object to be treated is uniform.
作 用：
第４図に示すように、フェライト組織の球状黒鉛鋳鉄を
、オーステンパー処理によりベイナイト組織に変態させ
るためには、先づ、ＡＩＲ悪温度以上に加熱して（図の
Ｂ）オーステナイト組織とし、次にパーライト組織が現
われないように、庵変態温度より若干高い焼入温度（図
のＤ）まで急速冷却しく図のＣ）、焼入温度に保持して
ベイナイト組織に変態させるのである（Ｅは空冷の際の
変化？示す。）。Function: As shown in Figure 4, in order to transform spheroidal graphite cast iron with a ferrite structure into a bainite structure through austempering treatment, it is first heated above the AIR cold temperature (B in the figure) to transform the austenite structure into a bainite structure. Then, in order to prevent the pearlite structure from appearing, it is rapidly cooled to a quenching temperature slightly higher than the Iori transformation temperature (D in the figure), then held at the quenching temperature to transform it into a bainite structure ( E indicates the change during air cooling.)
このプロセスのポイントとなるのは、０部の冷却方法と
、Ｄ部の焼入れ方法である。The key points in this process are the cooling method for part 0 and the quenching method for part D.
図中Ｃ部の速度が遅いと、パーライト組織が現出するの
は言うまでもないが、速すぎると、部分的にＮ１ｇ温度
以下となり、マルテンサイト組織が現出する恐れがある
。It goes without saying that if the speed at section C in the figure is slow, a pearlite structure will appear, but if it is too fast, the temperature will partially drop below N1g, and there is a risk that a martensitic structure will appear.
冷却方法として、温水中に、被処理物を浸漬することは
、冷水中に浸漬するのに比べて冷却速度が遅くなること
を意味し、温水に増粘剤を加えて増粘すると、粘性支配
の伝熱状態で、伝熱速度がさらに遅くなる。As a cooling method, immersing the workpiece in hot water means that the cooling rate is slower than immersing it in cold water, and when thickening agent is added to hot water, the viscosity is controlled. In the heat transfer state, the heat transfer rate becomes even slower.
図中り部に２いて、使用し得る流動層炉とテンパー炉は
、いずれも、恒温保持が可能であるが、前者の場合、流
動層の特性により炉内温度がほぼ一定となり、また伝熱
面るたりの伝熱量が、テンパー炉に比べて、大きくかつ
均一性が高い。したがって被処理物の各部の温度が、よ
り速く、より均一になる。Both fluidized bed furnaces and tempering furnaces, which can be used in the middle part of the figure (2), can maintain a constant temperature, but in the case of the former, the temperature inside the furnace is almost constant due to the characteristics of the fluidized bed, and the heat transfer The amount of heat transferred across the surface is larger and more uniform than that in a tempering furnace. Therefore, the temperature of each part of the object to be processed becomes faster and more uniform.
実施例：
第１図に例示した本発明の工程図（各工程名を括孤内に
示す。）に２いて、例えばフェライト組織の球状黒鉛鋳
物は、加熱炉（１）で、例えば約８５０゛Ｃ〜９２０℃
（Ａ、変態温度以上）でオーステナイト組織に変態させ
る。次に温水冷却器（２）の温水中に浸漬して、ａｌｌ
変態温度以上のベイナイト変態のみ起こる温度範囲（第
４図参照）に冷却する。温水冷却器の構造は、図に例示
するように、処理品の冷却速度全増減できる温水循遣手
段と、循４温水を加熱または冷却して、所定の温度範囲
に維持する恒温器を具えていることが望ましい。Example: In the process diagram of the present invention illustrated in FIG. 1 (each process name is shown in parentheses), for example, a spheroidal graphite casting with a ferritic structure is heated in a heating furnace (1) at a temperature of about 850°, for example. C~920℃
(A, transformation temperature or higher) to transform into an austenite structure. Next, immerse it in hot water from the hot water cooler (2) and
It is cooled to a temperature range above the transformation temperature in which only bainite transformation occurs (see FIG. 4). As illustrated in the figure, the structure of the hot water cooler includes a hot water circulation means that can fully increase or decrease the cooling rate of the processed product, and a thermostat that heats or cools the circulating hot water and maintains it within a predetermined temperature range. It is desirable to be present.
しかしながら、恒温維持機構と浸漬部を具えていれば、
図示した構造に拘らない。However, if it is equipped with a constant temperature maintenance mechanism and an immersion section,
It is not limited to the illustrated structure.
被処理物が、Ｍａ温度以上でかつ１鰻時的にペイナイ）
ｆ態のみを起こす温度に達した後、被処理物を、該温度
域を維持する流！ａ層炉（３）にＡ人し、ベイナイト化
を進行させる。このベイナイト化焼入れの後期において
、温度均一化能力は若干劣るが、安価なテンパー炉を使
用する方が一般に有利であるがこれに拘らない。The temperature of the material to be processed is higher than Ma temperature and the temperature is higher than 1 hour)
After reaching the temperature at which only the f-state occurs, the material to be treated is transferred to a flow that maintains the temperature range. A person is placed in the A-layer furnace (3) to proceed with bainite formation. In the latter stage of this bainitic quenching, the ability to equalize the temperature is slightly inferior, but it is generally more advantageous to use an inexpensive tempering furnace, but this is not restrictive.
温水を用いて冷却する場合の処理条件を例示すると、８
５０’Ｃ〜９２０℃の、オーステナイト組織の球状黒鉛
鋳物金、４０℃〜９０℃の温水を保持する温水冷却器（
２）に４〜８０秒浸漬した後、４０゛Ｃ〜８００’Ｃｉ
Ｃ維持した流動層炉に１０抄から２０分装入し、次にテ
ンパー炉に移して、２０分〜３時間２００°Ｃ〜４００
℃に維持する。To illustrate the processing conditions when cooling using hot water, 8
50'C to 920C, austenitic structure spheroidal graphite cast gold, hot water cooler that holds hot water of 40C to 90C (
2) for 4 to 80 seconds, then 40°C to 800'Ci.
Charge the 10 sheets to a fluidized bed furnace maintained at C for 20 minutes, then transfer to a tempering furnace and heat at 200°C to 400°C for 20 minutes to 3 hours.
Maintain at °C.
温水の代わりに増粘剤で増粘した温水を用いると、冷却
速度が遅くなるので、増粘水温度を下げることが可能で
、例えば、８０’Ｑ〜８０℃の増粘温水中で４〜８０秒
冷却すると良好な結果が得られる。If hot water thickened with a thickener is used instead of hot water, the cooling rate will be slow, so the temperature of the thickened water can be lowered. Cooling for 80 seconds gives good results.
温水温度が１００℃に近づくと蒸気の発生が多くなり、
増粘剤の濃度管理が困難となり好ましくないＯ
次に第２図に示した円浦状テストピースのＰ点（端面）
・ら３ＩＩＩＩｌＯ点）とＱ点（肉厚中心部）に２いて
、７Ｇ’Ｃの温水（点線）と４５℃の増粘温水（実線）
とにより冷却実験を行った結果を第８図に示す。ただし
、彼処４オーステナイト化球状黒鉛鋳鉄の温度は８５０
℃、温水２よび増粘温水による冷却時間８秒、２００
’Ｃの流−０炉による処理８０秒、４００°Ｃの流動層
保持８０分のベイナイト変態焼入れ時間の条件全採用し
た。９曲線（肉厚中心部）の６００℃附近に２けるこう
配（冷却速度）は温水の場合と増粘温度について、はぼ
同じであるが、Ｐｔｔｔｌ！ｌ！面カラ３Ｉｌｊ１１）
ノ場合、７０’Ｃ温水での冷却速度が大で、そのため第
１表に示すように、硬度（端面硬度）が増している〇
第１表
発明の効果：
本発明は、球状黒鉛鋳鉄をオーステッパー処理してベイ
ナイト組織にするに際し、Ａ１変態温度以上でオーステ
ナイト組織とし定速状黒鉛鋳鉄を温水または増粘温水で
冷却して１Ｖｉｓ温度以上で、ベイナイト変態のみが起
こる温度に冷却し、このことでパーライト組織の現出を
防止する点に特徴がある。さらに、温水または増粘温水
を便用すると、Ｍｓ温温度トド降ドする恐れが少なく、
シたがって、マルテンサイト組織が現出する危険がない
〇そのほか、油冷の場合などのように、冷却器が被処理
物に付着して以後処理で燃焼する危険性、それに基づく
公害の恐れもない。When the hot water temperature approaches 100℃, more steam is generated.
It becomes difficult to control the concentration of the thickener, which is undesirable.
・7G'C hot water (dotted line) and 45℃ thickened hot water (solid line)
Figure 8 shows the results of a cooling experiment. However, the temperature of 4-austenitized spheroidal graphite cast iron is 850.
℃, cooling time with hot water 2 and thickened hot water 8 seconds, 200
All conditions were adopted: treatment in a 'C flow-0 furnace for 80 seconds, fluidized bed retention at 400°C, and bainitic transformation quenching time for 80 minutes. The slope (cooling rate) of the 9th curve (center of wall thickness) near 600°C is almost the same for hot water and thickening temperature, but Ptttl! l! Menkara 3Ilj11)
In this case, the cooling rate with 70'C hot water is high, and therefore the hardness (end surface hardness) is increased as shown in Table 1. Table 1 Effects of the invention: The present invention has the advantage that the spheroidal graphite cast iron is When forming a bainite structure through stepper treatment, constant velocity graphite cast iron is cooled with hot water or thickening hot water to form an austenite structure at a temperature above A1 transformation temperature to a temperature at which only bainite transformation occurs at a temperature above 1Vis. The feature is that it prevents the appearance of pearlite structure. Furthermore, when using warm water or thickened hot water, there is less risk of Ms temperature drop.
Therefore, there is no risk of martensitic structure appearing. In addition, as in the case of oil cooling, there is a risk that the cooler will adhere to the processed material and burn it during subsequent processing, and there is also the risk of pollution caused by this. do not have.
第１図は本発明の製造方法の工程と、使用装置の代表例
を示す流れ図である。
ｇ２図は、本発明のオーステンパー処理の実験に使用し
たテストピースの断面図である。
第８図は、このテストピースについての実験結果を、た
て軸に時間、横軸に温度をとって示したものである。
第４図は、オーステンパー処理の軌跡を示す連続冷却変
態図（ＯＣＴ曲線）である。
（１）・・・加熱炉、（２）・・・温水冷却器、（３）
・・・流動層Ｐ、 （４）・・・テンパー炉７−−−
−−−−Ｎ、
缶 ＝
第２図
銹１％Ｆ′１（ＳｅＣ）→
第４図FIG. 1 is a flowchart showing the steps of the manufacturing method of the present invention and a typical example of the equipment used. Figure g2 is a cross-sectional view of the test piece used in the austempering experiment of the present invention. FIG. 8 shows the experimental results for this test piece, with time plotted on the vertical axis and temperature plotted on the horizontal axis. FIG. 4 is a continuous cooling transformation diagram (OCT curve) showing the locus of austempering treatment. (1)...Heating furnace, (2)...Hot water cooler, (3)
... Fluidized bed P, (4) ... Tempering furnace 7 ---
----N, can = Fig. 2 Rust 1%F'1 (SeC) → Fig. 4
Claims (1)
ト領域からオーステンパー処理してベイナイト組織とす
る球状黒鉛鋳鉄の製造方法においてＡ＿１変態温度以上
の被処理球状黒鉛鋳鉄体を温水に浸漬して、Ｍｓ変態温
度より高いベイナイト変態のみが起こる温度域まで冷却
し、該温度域に温度保持してベイナイト変態を起こさせ
る、ことを特徴とする球状黒鉛鋳鉄の製造方法。 ２ 温水が増粘剤を含んだ増粘温水である特許請求の範
囲第１項記載の球状黒鉛鋳鉄の製造方法。 ３ ベイナイト変態のみを起こさせる温度域で、流動層
炉を用いてベイナイト変態を起こさせる特許請求の範囲
第１項または第２項記載の球状黒鉛鋳鉄の製造方法。 ４ ベイナイト変態のみを起こさせる温度域で、最初流
動層を用い、引続いてテンパー炉を用いてベイナイト変
態を起こさせる特許請求の範囲第１項または第２項記載
の球状黒鉛鋳鉄の製造方法。 ５ 温水温度が４０℃〜１００℃、浸漬時間が４〜３０
秒で、４０℃〜４５０℃の流動層炉に１０秒〜６０分保
持した後２００℃〜４００℃のテンパー炉で２０分〜２
時間保持する特許請求の範囲第４項記載の球状黒鉛屑鉄
の製造方法。 ６ ４０℃〜１００℃の温水の代りに、３０℃〜８０℃
の増粘剤で増粘した温水を用いる特許請求の範囲第５項
記載の球状黒鉛鋳鉄の製造方法。 ７ 温水温度が４０℃〜１００℃、浸漬時間が４〜３０
秒で冷却後、２００℃〜４００℃の流動層テンパー炉で
１０分〜３時間保持してベイナイト変態を起させる特許
請求の範囲第１項または第２項記載の球状黒鉛鋳鉄の製
造方法。 ８ ４０℃〜１００℃の温水の代りに、３０℃〜８０℃
の増粘剤で増粘した温水を用いる特許請求の範囲第７項
記載の球状黒鉛鋳鉄の製造方法。 ９ 温水冷却あるいは増粘剤で増粘した温水冷却の過程
で、冷却前半は冷却器内の循環速度を増大して冷却速度
を上げ、冷却途中で循環速度を減少して冷却速度を低下
させる特許請求の範囲第５項、第６項、第７項、第８項
のいずれか１に記載の球状黒鉛鋳鉄の製造法。[Scope of Claims] 1 In a method for manufacturing spheroidal graphite cast iron in which spheroidal graphite cast iron is austempered from an austenitic region at a transformation temperature of A_1 or higher to form a bainitic structure, a spheroidal graphite cast iron body to be treated at a temperature of at least A_1 transformation temperature is immersed in hot water. A method for producing spheroidal graphite cast iron, which comprises cooling to a temperature range higher than the Ms transformation temperature where only bainite transformation occurs, and maintaining the temperature in the temperature range to cause bainite transformation. 2. The method for producing spheroidal graphite cast iron according to claim 1, wherein the hot water is thickened hot water containing a thickener. 3. The method for producing spheroidal graphite cast iron according to claim 1 or 2, in which bainite transformation is caused using a fluidized bed furnace in a temperature range where only bainite transformation occurs. 4. The method for producing spheroidal graphite cast iron according to claim 1 or 2, in which bainite transformation is caused first in a fluidized bed and then in a tempering furnace in a temperature range where only bainite transformation occurs. 5 Hot water temperature is 40℃~100℃, immersion time is 4~30℃
After holding in a fluidized bed furnace at 40°C to 450°C for 10 seconds to 60 minutes, heat in a tempering furnace at 200°C to 400°C for 20 minutes to 2 seconds.
A method for producing spheroidal graphite scrap iron according to claim 4, which is maintained for a period of time. 6.30℃~80℃ instead of 40℃~100℃ hot water
The method for producing spheroidal graphite cast iron according to claim 5, which uses hot water thickened with a thickener. 7 Hot water temperature is 40℃~100℃, immersion time is 4~30℃
The method for producing spheroidal graphite cast iron according to claim 1 or 2, wherein the spheroidal graphite cast iron is cooled in seconds and then held in a fluidized bed tempering furnace at 200° C. to 400° C. for 10 minutes to 3 hours to cause bainite transformation. 8.30℃~80℃ instead of 40℃~100℃ hot water
The method for producing spheroidal graphite cast iron according to claim 7, which uses warm water thickened with a thickener. 9 In the process of hot water cooling or hot water thickened with a thickening agent, the circulation speed within the cooler is increased during the first half of cooling to increase the cooling speed, and the circulation speed is decreased during cooling to reduce the cooling speed. A method for producing spheroidal graphite cast iron according to any one of claims 5, 6, 7, and 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12656087A JPS63290218A (en) | 1987-05-22 | 1987-05-22 | Manufacture of spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12656087A JPS63290218A (en) | 1987-05-22 | 1987-05-22 | Manufacture of spheroidal graphite cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63290218A true JPS63290218A (en) | 1988-11-28 |
Family
ID=14938188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12656087A Pending JPS63290218A (en) | 1987-05-22 | 1987-05-22 | Manufacture of spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63290218A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0441615A (en) * | 1990-06-04 | 1992-02-12 | Komatsu Ltd | Method and device for austempering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5524932A (en) * | 1978-08-08 | 1980-02-22 | Nippon Steel Corp | Manufacture of bainite tough hardening steel |
| JPS5818574A (en) * | 1981-07-25 | 1983-02-03 | Ichiro Suzuki | Pump for highly viscous substance |
| JPS58185745A (en) * | 1982-04-22 | 1983-10-29 | Mazda Motor Corp | Spherical graphite cast iron parts and their manufacture |
| JPS6141721A (en) * | 1984-07-31 | 1986-02-28 | Kubota Ltd | Production of high-strength ductile cast iron pipe having high ductility |
-
1987
- 1987-05-22 JP JP12656087A patent/JPS63290218A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5524932A (en) * | 1978-08-08 | 1980-02-22 | Nippon Steel Corp | Manufacture of bainite tough hardening steel |
| JPS5818574A (en) * | 1981-07-25 | 1983-02-03 | Ichiro Suzuki | Pump for highly viscous substance |
| JPS58185745A (en) * | 1982-04-22 | 1983-10-29 | Mazda Motor Corp | Spherical graphite cast iron parts and their manufacture |
| JPS6141721A (en) * | 1984-07-31 | 1986-02-28 | Kubota Ltd | Production of high-strength ductile cast iron pipe having high ductility |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0441615A (en) * | 1990-06-04 | 1992-02-12 | Komatsu Ltd | Method and device for austempering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4021272A (en) | Method of isothermal annealing of band steels for tools and razor blades | |
| JPS63290218A (en) | Manufacture of spheroidal graphite cast iron | |
| JPS58141333A (en) | Heat treatment of forging | |
| CA1210672A (en) | Method for at least partial isothermal bainitizing of workpieces made of ferrous materials | |
| GB1439071A (en) | Thermal treatment of steel | |
| Ochi et al. | A study of spheroidizing mechanism of cementite in annealing of medium carbon steel | |
| JPS5839727A (en) | Cooling method for heated metal in heat treatment of metal | |
| JPS5719320A (en) | Heat treatment of spheroidal graphite cast iron | |
| RU2763981C1 (en) | Method for producing calibrated cold-heading steel | |
| JPS589929A (en) | Heat treatment for roll die for cold pilger rolling mill | |
| JPH0426716A (en) | Short-time spheroidization annealing method for steel bar and wire | |
| RU1788976C (en) | Method of tractor cast track link thermal working | |
| JP2957200B2 (en) | Austempering of steel fasteners requiring elasticity | |
| Cote et al. | Isothermal Bainite Processing of ASTM A 723 Components | |
| JPS63317620A (en) | Iron metal heat treatment | |
| JPH0335363B2 (en) | ||
| RU1788041C (en) | Method of isothermal quenching of high-strength iron castings | |
| JP2001316723A (en) | Heat treatment method of ductile cast iron | |
| JPS6283419A (en) | Heat treatment for spheroidal graphite cast iron | |
| SU685702A1 (en) | Method of tempering steel details | |
| SU943300A1 (en) | Method for treating billets of carbon and alloyed steel | |
| JPH04236715A (en) | Annealing method for directly spheroidizing steel | |
| JPS6176612A (en) | Manufacture of high strength spheroidal graphite cast iron | |
| SU652229A1 (en) | Rolled stock production method | |
| JPS6135545Y2 (en) |