JPS6052509A - Manufacture of vermicular graphite cast iron - Google Patents

Manufacture of vermicular graphite cast iron

Info

Publication number
JPS6052509A
JPS6052509A JP16079183A JP16079183A JPS6052509A JP S6052509 A JPS6052509 A JP S6052509A JP 16079183 A JP16079183 A JP 16079183A JP 16079183 A JP16079183 A JP 16079183A JP S6052509 A JPS6052509 A JP S6052509A
Authority
JP
Japan
Prior art keywords
cast iron
graphite cast
casting
vermicular graphite
temp
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
Application number
JP16079183A
Other languages
Japanese (ja)
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 JP16079183A priority Critical patent/JPS6052509A/en
Publication of JPS6052509A publication Critical patent/JPS6052509A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • C21D1/19Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D5/00Heat treatments of cast-iron

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE:To obtain a superior product in shortened working stages without adding expensive elements 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 carged 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 it not caused, and the cooling is stopped once at a temp. above the Ms point. The temp. is slowly dropped, and 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’JeUfi法に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing high-strength vermicular graphite cast iron, and more particularly to the 'JeUfi method for producing 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、バーライ1〜地のもの
でその抗張力は高々40 kg/mm2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 vermicular graphite cast iron is about 40 kg/mm2 at most, and in order to obtain a material with even higher tensile strength, it is necessary to use a bainite structure as the base. The method of converting vermicular graphite cast iron into bainite in an as-cast state requires the addition of large amounts of expensive special elements such as Mo and Ni. Although this method is a known fact, it is extremely uneconomical.

本発明の目的は、Nj、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 Nj and Mo. It is in.

本発明は、バーミキュラ黒鉛鎚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、」1記A1変態域以上の温
度からパーライト変態を生ぜしぬない冷却速度で急冷し
、Ms点以」二の温度で冷却を一旦停止した後、緩やか
に温度を降下させ、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 hammer 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. Then, the temperature is rapidly cooled from a temperature above the A1 transformation range in 1. at a cooling rate that does not cause pearlite transformation, and after stopping the cooling once at a temperature of 2.2 below the Ms point, the temperature is slowly lowered, and a predetermined period of time has elapsed. After that, it is left to cool or rapidly cooled.

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.

/ 素案 実施例 1 (1)化学成分 (重量%) (2)テストピース Φ40 ’< 300mm(3)
注入温度 1.400〜1.4200C(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 X 300mm(3)注
入温度 1.400へ1.4209C(4)熱処理 (5)機械的性質 上述せる通り基地相識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。
/ Draft example 1 (1) Chemical composition (weight%) (2) Test piece Φ40'< 300mm (3)
Injection temperature 1.400-1.4200C (4) Heat treatment (5) Mechanical properties Example 1 (1) Chemical composition (wt%) (2) Test piece φ40 x 300mm (3) Injection temperature 1.400 to 1. 4209C (4) Heat treatment (5) Mechanical properties As mentioned above, the base phase is a bainite structure, and it is a vermicular graphite cast iron that has 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、Ms
点以」二の温度で冷却を一旦停止した後、緩やかに温度
を降下させ、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. Ms.
After cooling is temporarily stopped at the second temperature, the temperature is gradually lowered, and after a predetermined period of time has elapsed, the cooling is 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A1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、」1記A1変態域以上の温度からパーライ
ト変態を生ぜしぬない冷却速度で急冷し、Ms点以」二
の温度で冷却を一旦停止した後、緩やかに温度を降下さ
せ、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 In a method for manufacturing vermicular graphite cast iron, in which molten metal having a composition is poured into a mold, solidified, the cast product is taken out of the mold at a predetermined temperature above the A1 transformation region, and rapidly cooled, Rapid cooling from the above temperature at a cooling rate that does not cause pearlite transformation, and after stopping the cooling once at a temperature below Ms point, slowly lower the temperature, and after a predetermined period of time, allow it to cool or rapidly cool it. A method for producing vermicular graphite cast iron characterized by:
JP16079183A 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron Pending JPS6052509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16079183A JPS6052509A (en) 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16079183A JPS6052509A (en) 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron

Publications (1)

Publication Number Publication Date
JPS6052509A true JPS6052509A (en) 1985-03-25

Family

ID=15722527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16079183A Pending JPS6052509A (en) 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron

Country Status (1)

Country Link
JP (1) JPS6052509A (en)

Cited By (5)

* 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
JPS6418860A (en) * 1987-04-29 1989-01-23 Matorotsukusu Electron Syst Lt Error dispersion for digital information and organization of error dispersion form
US4971116A (en) * 1988-11-09 1990-11-20 Aisin Aw Kabushiki Kaisha Pressure control valve
US5014747A (en) * 1988-11-09 1991-05-14 Aisin Aw Kabushiki Kaisha Pressure control valve
US5259414A (en) * 1988-11-09 1993-11-09 Aisin Aw Co., Ltd Pressure control valve

Cited By (5)

* 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
JPS6418860A (en) * 1987-04-29 1989-01-23 Matorotsukusu Electron Syst Lt Error dispersion for digital information and organization of error dispersion form
US4971116A (en) * 1988-11-09 1990-11-20 Aisin Aw Kabushiki Kaisha Pressure control valve
US5014747A (en) * 1988-11-09 1991-05-14 Aisin Aw Kabushiki Kaisha Pressure control valve
US5259414A (en) * 1988-11-09 1993-11-09 Aisin Aw Co., Ltd Pressure control valve

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