JPS6052510A - Manufacture of vermicular graphite cast iron - Google Patents

Manufacture of vermicular graphite cast iron

Info

Publication number
JPS6052510A
JPS6052510A JP16079283A JP16079283A JPS6052510A JP S6052510 A JPS6052510 A JP S6052510A JP 16079283 A JP16079283 A JP 16079283A JP 16079283 A JP16079283 A JP 16079283A JP S6052510 A JPS6052510 A JP S6052510A
Authority
JP
Japan
Prior art keywords
cast iron
graphite cast
casting
vermicular graphite
rapidly cooled
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
Application number
JP16079283A
Other languages
Japanese (ja)
Other versions
JP2659352B2 (en
Inventor
Makoto Suenaga
末永　允
Mitsuru Yano
矢野　満
Yasuoki Ishihara
石原　安興
Kimiteru Otsuka
公輝 大塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP58160792A priority Critical patent/JP2659352B2/en
Publication of JPS6052510A publication Critical patent/JPS6052510A/en
Application granted granted Critical
Publication of JP2659352B2 publication Critical patent/JP2659352B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening

Abstract

PURPOSE:To obtain a superior product in shortened working stages without adding expensive element in large quantities by releasing a casting from the mold at a prescribed temp. above the A1 transformation range, and rapidly cooling the casting under specified conditions. CONSTITUTION:Molten metal having the composition of vermicular graphite cast iron is charged into a casting mold and solidified. The resulting casting is taken out of the mold at a prescribed temp. above the A1 transformation range, and it is rapidly cooled. At this time, the casting is rapidly cooled from said temp. at a cooling rate at which pearlitic transformation is not caused, and it is held at a temp. at which a mixed structure consising of bainite and austenite is stably formed. After the lapse of a prescribed time, the casting is allowed to cool, or it is rapidly cooled. Thus, vermicular graphite cast iron having extremely superior mechanical properties such as high strength and toughness is obtd.

Description

【発明の詳細な説明】 本発明は高強度バーミキュラ黒鉛鋳鉄の製造法に係わり
、特に鋳放し状態で高強度、高靭性を有するバーミキュ
ラ黒鉛鋳鉄の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing high-strength vermicular graphite cast iron, and particularly to a method for manufacturing vermicular graphite cast iron that has high strength and high toughness in an as-cast state.

バーミキュラ黒鉛鋳鉄は鋳鉄材料の中でねずみ鋳鉄に近
い減衰能を有し、且引張強さはねずみ鋳鉄と球状黒鉛鋳
鉄の間にあって、鋳造性が良いことから、ねずみ鋳鉄及
び球状黒鉛鋳鉄の代替材として需要の増化が期待されて
いる。Among cast iron materials, vermicular graphite cast iron has a damping capacity close to that of gray cast iron, has a tensile strength between gray cast iron and spheroidal graphite cast iron, and has good castability, so it is an alternative to gray cast iron and spheroidal graphite cast iron. Demand is expected to increase as a result.

バーミキュラ黒鉛鋳鉄において、パーライト地のもので
その抗張力は高々４０　ｋｇ／ｍｍ”程度であり、さら
に高い抗張力の材料を得るには基地をベイナイト組織と
する必要がある。バーミキュラ黒鉛鋳鉄を鋳放しの状態
でベイナイト化する方法はＭｏ、Ｎｉなどの高価な特殊
元素を多量に添加しなければならない。この方法は公知
の事実であるが、きわめて不経済である。In vermicular graphite cast iron, the tensile strength of pearlite base is about 40 kg/mm at most, and to obtain a material with even higher tensile strength, the base needs to have a bainite structure. Vermicular graphite cast iron is in an as-cast state. The method of bainiticization requires the addition of large amounts of expensive special elements such as Mo and Ni. Although this method is a well-known fact, it is extremely uneconomical.

本発明の目的は、Ｎｉ、Ｍｏなどの高価な元素を多量に
添加せずに、作業工程を短縮し且製造原価を低減し得る
高強度、高靭性のバーミキュラ黒鉛鋳鉄を製造する方法
を提供するにある。An object of the present invention is to provide a method for manufacturing vermicular graphite cast iron with high strength and high toughness, which can shorten the working process and reduce manufacturing costs without adding large amounts of expensive elements such as Ni and Mo. It is in.

本発明は、バーミキュラ黒鉛鋳鉄組成を有する溶湯を鋳
型に注湯し凝固させた後、鋳造品をＡ１変態域以上のあ
る所定の温度で鋳型から取出し、急冷するバーミキュラ
黒鉛鋳鉄の製造法であって、上記Ａｌ変態域以上の温度
からパーライト変態を生ぜしめない冷却速度で急冷し、
ベイナイトとオーステナイトの混合組織を安定的に生せ
しめる温度に保持し、所定時間経過後、放冷または急冷
するものである。The present invention is a method for manufacturing vermicular graphite cast iron, in which a molten metal having a vermicular graphite cast iron composition is poured into a mold and solidified, and then the cast product is taken out of the mold at a predetermined temperature above the A1 transformation range and rapidly cooled. , rapidly cooling from a temperature above the Al transformation range at a cooling rate that does not cause pearlite transformation,
The temperature is maintained at a temperature that allows a mixed structure of bainite and austenite to stably grow, and after a predetermined period of time, the temperature is allowed to cool or quenched.

以下本発明の実施例について詳細に説明する。Examples of the present invention will be described in detail below.

・対案 ３一 実施例　１ （１）化学成分　（重量％） （２）テストピース　φ４０　Ｘ　３００ｍｍ（３）注
入温度　１．４００へ１．４２０　’Ｃ（４）熱処理 （５）機械的性質 実施例　１ （１）化学成分　（重量％） （２）テストピース　Φ４０　Ｋ　３００ｍｍ（３）注
入温度　１．４００〜１．４２０　’Ｃ（４）熱処理 （５）機械的性質 上述せる通り基地組織はベイナイト組織で、抗張力、耐
力、伸び、衝撃値などきわめて優れた機械的性質を有す
るバーミキュラ黒鉛鋳鉄である。・Counterplan 3-Example 1 (1) Chemical composition (wt%) (2) Test piece φ40 x 300 mm (3) Injection temperature 1.400 to 1.420'C (4) Heat treatment (5) Mechanical property example 1 (1) Chemical composition (wt%) (2) Test piece Φ40 K 300 mm (3) Injection temperature 1.400 to 1.420'C (4) Heat treatment (5) Mechanical properties As mentioned above, the base structure is a bainite structure It is a vermicular graphite cast iron with extremely excellent mechanical properties such as tensile strength, yield strength, elongation, and impact value.

以上の説明で明らかなように本発明によるバーミキュラ
黒鉛鋳鉄の製造法は、鋳造品をＡ１変態域以上のある所
定の温度で鋳型から取出し、急冷するバーミキュラ黒鉛
鋳鉄の製造法であって、上記Ａ１変態域以上の温度から
パーライト変態を生ぜしめない冷却速度で急冷し、ベイ
ナイトとオーステナイトの混合組織を安定的に生ぜしぬ
る温度に保持し、所定時間経過後、放冷または急冷する
ものである。As is clear from the above explanation, the method for producing vermicular graphite cast iron according to the present invention is a method for producing vermicular graphite cast iron in which a cast product is taken out of a mold at a predetermined temperature above the A1 transformation range and rapidly cooled. The material is rapidly cooled from a temperature above the transformation range at a cooling rate that does not cause pearlite transformation, maintained at a lukewarm temperature at which a mixed structure of bainite and austenite is stably produced, and after a predetermined period of time, allowed to cool or rapidly cooled.

従って、鋳造品の製作工程の短縮、再加熱の廃止による
製造原価の低減など経済性に優れ、しかも高強度、高靭
性など機械的性質のきわめて優れたバーミキュラ黒鉛鋳
鉄を安定して製造し得るものである。Therefore, it is possible to stably produce vermicular graphite cast iron, which has excellent economic efficiency by shortening the manufacturing process of castings and reducing manufacturing costs by eliminating reheating, and has extremely excellent mechanical properties such as high strength and high toughness. It is.

Claims (1)

【特許請求の範囲】[Claims] バーミキュラ黒鉛鋳鉄組成を有する溶湯を鋳型に注湯し
、凝固させた後鋳造品をＡｌ変態域以上の所定の温度で
鋳型から取出し、急冷するバーミキュラ黒鉛鋳鉄の製造
法において、上記Ａ１変態域以上の温度からパーライト
変態を生ぜしめない冷却速度で急冷し、ベイナイトとオ
ーステナイトの混合組織を安定的に生ぜしめる温度に保
持し、所定時間経過後、放冷または急冷することを特徴
とするバーミキュラ黒鉛鋳鉄の製造法。Vermicular graphite cast iron A method for manufacturing vermicular graphite cast iron in which a molten metal having a composition of vermicular graphite cast iron is poured into a mold, solidified, and then the cast product is taken out from the mold at a predetermined temperature above the Al transformation range and rapidly cooled. Vermicular graphite cast iron characterized by being rapidly cooled at a cooling rate that does not cause pearlite transformation, maintained at a temperature that stably produces a mixed structure of bainite and austenite, and then allowed to cool or rapidly cooled after a predetermined period of time. Manufacturing method.
JP58160792A 1983-09-01 1983-09-01 Manufacturing method of Bamikiura graphite cast iron Expired - Lifetime JP2659352B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58160792A JP2659352B2 (en) 1983-09-01 1983-09-01 Manufacturing method of Bamikiura graphite cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58160792A JP2659352B2 (en) 1983-09-01 1983-09-01 Manufacturing method of Bamikiura graphite cast iron

Publications (2)

Publication Number Publication Date
JPS6052510A true JPS6052510A (en) 1985-03-25
JP2659352B2 JP2659352B2 (en) 1997-09-30

Family

ID=15722549

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58160792A Expired - Lifetime JP2659352B2 (en) 1983-09-01 1983-09-01 Manufacturing method of Bamikiura graphite cast iron

Country Status (1)

Country Link
JP (1) JP2659352B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744389A (en) * 1985-10-15 1988-05-17 Diesel Kiki Co., Ltd. Pressure control device
US4763872A (en) * 1986-07-11 1988-08-16 Diesel Kiki Co., Ltd. Operating oil introduction type electromagnetic valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54138812A (en) * 1978-03-31 1979-10-27 Standard Car Truck Co Abrasion resistant cast iron

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54138812A (en) * 1978-03-31 1979-10-27 Standard Car Truck Co Abrasion resistant cast iron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744389A (en) * 1985-10-15 1988-05-17 Diesel Kiki Co., Ltd. Pressure control device
US4763872A (en) * 1986-07-11 1988-08-16 Diesel Kiki Co., Ltd. Operating oil introduction type electromagnetic valve

Also Published As

Publication number Publication date
JP2659352B2 (en) 1997-09-30

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