JPS6052511A - Manufacture of vermicular graphite cast iron - Google Patents

Manufacture of vermicular graphite cast iron

Info

Publication number
JPS6052511A
JPS6052511A JP16079383A JP16079383A JPS6052511A JP S6052511 A JPS6052511 A JP S6052511A JP 16079383 A JP16079383 A JP 16079383A JP 16079383 A JP16079383 A JP 16079383A JP S6052511 A JPS6052511 A JP S6052511A
Authority
JP
Japan
Prior art keywords
cast iron
temp
graphite cast
vermicular graphite
casting
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
JP16079383A
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 JP16079383A priority Critical patent/JPS6052511A/en
Publication of JPS6052511A publication Critical patent/JPS6052511A/en
Pending 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

Abstract

PURPOSE:To obtain a superior product without adding expensive elements in large quantities by reheating a casting to a temp. in the austenitizing temp. range 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 reheated to a temp. in the austenitizing temp. range 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 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】 本発明はバーミキュラ黒鉛鋳鉄の製造法に係わり、特に
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 producing vermicular graphite cast iron, and particularly to a method for producing vermicular graphite cast iron having high strength and high toughness.

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／ｍｉ２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
でベイティ１−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-based cast iron is about 40 kg/mi2 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 to beity 1- in an as-cast state requires adding a large amount 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、Ｎｉ、Ｍｏなどの高価な元素を多量に
添加せずに、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 reduce manufacturing costs without adding large amounts of expensive elements such as Ni and Mo.

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変態域以上のオ
ーステナイト化温度域に再加熱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点以上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 producing 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 reheated to an austenitizing temperature range of A1 transformation range or higher and then rapidly cooled, Rapid cooling from a temperature above the A1 transformation range at a cooling rate that does not cause pearlite transformation,
After cooling is temporarily stopped at a temperature equal to or higher than the Ms point, the temperature is gradually lowered, and after a predetermined period of time has elapsed, the cooling is allowed to occur or is 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.

初案 一全− 実施例　１ （１）化学成分　（重量％） （２）ナストピース　Φ４０　Ｘ３００＋ｎｍ（３）注
入温度　１．４００〜１．４２０°Ｃ（４）熱処理 ぶに０°ｃ×ｍｒ （５）機械的性質 （６）組織、Ｎｏ、１は第１図に示す。First draft - Example 1 (1) Chemical composition (wt%) (2) Nast piece Φ40 ) Mechanical properties (6) Structure, No. 1 is shown in FIG.

亀 ４一 実施例　１ （１）化学成分　（重量％） （２）テストピース　（ｐ　４０　Ｘ’　３００＋ｎ＋
ｎ（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。Turtle 41 Example 1 (1) Chemical composition (weight%) (2) Test piece (p 40 X' 300+n+
n(3) Injection temperature 1.400-1.420°C (4)
Heat treatment (5) Mechanical properties As mentioned above, the base structure is a bainite structure, which is vermicular graphite cast iron having 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変態域以上のオース
テナイト化温度域に再加熱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」二の温度か
らパーライト変態を生ぜしめない冷却速度で急冷し、Ｍ
ｓ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 reheated to an austenitizing temperature range of the A1 transformation range or higher and then rapidly cooled. From the second temperature range, the M
After cooling is temporarily stopped at a temperature above point s, the temperature is gradually lowered, and after a predetermined period of time, cooling is performed either by standing or rapidly cooling.

従って、鋳造品の製作工程の短縮、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 is economical by shortening the manufacturing process of casting products and reducing manufacturing costs, and which also has extremely excellent mechanical properties such as high strength and high toughness.

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変態域以上のオーステナイ
ト化温度域に再加熱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」二の温度からパー
ライト変態を生せしめない冷却速度で急冷し、Ｍｓ点以
上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 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 and solidified, and then the cast product is reheated to an austenitizing temperature range above the A1 transformation range and rapidly cooled. It is characterized by rapidly cooling from the second temperature at a cooling rate that does not cause pearlite transformation, once stopping the cooling at a temperature above the Ms point, and then slowly lowering the temperature, and after a predetermined period of time, cooling or rapid cooling. A manufacturing method for vermicular graphite cast iron.
JP16079383A 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron Pending JPS6052511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16079383A JPS6052511A (en) 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16079383A JPS6052511A (en) 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron

Publications (1)

Publication Number Publication Date
JPS6052511A true JPS6052511A (en) 1985-03-25

Family

ID=15722571

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16079383A Pending JPS6052511A (en) 1983-09-01 1983-09-01 Manufacture of vermicular graphite cast iron

Country Status (1)

Country Link
JP (1) JPS6052511A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008509280A (en) * 2004-08-06 2008-03-27 アーベー エスコーエフ Heat treatment method for steel or cast iron workpieces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008509280A (en) * 2004-08-06 2008-03-27 アーベー エスコーエフ Heat treatment method for steel or cast iron workpieces

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