JPH01313147A - Method for continuously casting cast iron tube - Google Patents
Method for continuously casting cast iron tubeInfo
- Publication number
- JPH01313147A JPH01313147A JP14350288A JP14350288A JPH01313147A JP H01313147 A JPH01313147 A JP H01313147A JP 14350288 A JP14350288 A JP 14350288A JP 14350288 A JP14350288 A JP 14350288A JP H01313147 A JPH01313147 A JP H01313147A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- cast iron
- continuous casting
- content
- cast
- 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
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005266 casting Methods 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 53
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 238000009749 continuous casting Methods 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims description 11
- 239000002054 inoculum Substances 0.000 claims description 10
- 229910001567 cementite Inorganic materials 0.000 abstract description 15
- 230000005496 eutectics Effects 0.000 abstract description 15
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000011081 inoculation Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、鋳鉄管の連続鋳造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a continuous casting method for cast iron pipes.
［従来の技術］
ｉ続鋳造方法による鋳鉄管は、溶湯保持炉の鋳込口に設
けた鋳型装置により溶湯を冷却することにて凝固形成さ
れる。ここで、鋳型装置内の溶湯は、鋳型が中子部とと
もに形成する管成形通路にて、その管状の内外面から冷
却される。[Prior Art] Cast iron pipes produced by the i-continuous casting method are solidified by cooling the molten metal using a mold device provided at the pouring port of a molten metal holding furnace. Here, the molten metal in the mold apparatus is cooled from the inner and outer surfaces of the tube in a tube forming passage formed by the mold together with the core.
［発明が解決しようとする課題］
したがって、上記鋳鉄管の連続鋳造方法にあっては、特
に薄肉管になるほど、溶湯が鋳型装置内で急冷されやす
く、結果としてセメンタイト共晶を生じ、チル化する。[Problems to be Solved by the Invention] Therefore, in the continuous casting method for cast iron pipes, the thinner the pipe, the more likely the molten metal is to be rapidly cooled in the molding device, resulting in cementite eutectic formation and chilling. .
なお、特開昭５８−１９３３０８号公報には、中実鋳片
のチル化を防止するため、溶湯の成分を特定するととも
に、接種を強化する方法が提案されている。しかしなが
ら、この中実鋳片のための技術な、中空鋳鉄管のチル化
防止対策として採用したとしても、完全かつ安全的にセ
メンタイト共晶の発生とチル化を防止することは困難で
ある。In addition, Japanese Patent Laid-Open No. 193308/1983 proposes a method of specifying the components of the molten metal and strengthening the inoculation in order to prevent the solid slab from being chilled. However, even if this technology for solid slabs is adopted as a measure to prevent chilling of hollow cast iron pipes, it is difficult to completely and safely prevent the generation of cementite eutectic and chilling.
また、鋳鉄の接種効果は１５分が限度であり、１５分以
上経過するとフェーディングにより接種効果は薄れるこ
とが知られている。ところが、鋳鉄管の連続鋳造速度は
５（１０ｋｇ／時間程度であって非常に遅く、溶湯の保
持時間は１時間を越えることが通常である。したがって
、鋳鉄管の連続鋳造に際し、単に接種するだけでは効果
的でない。Furthermore, it is known that the inoculation effect of cast iron is limited to 15 minutes, and that the inoculation effect weakens due to fading after 15 minutes. However, the continuous casting speed of cast iron pipes is very slow at about 5 (10 kg/hour), and the holding time of the molten metal is usually over 1 hour. Therefore, when continuously casting cast iron pipes, it is necessary to simply inoculate That's not effective.
本発明は、鋳鉄管の連続鋳造に際し、薄肉管についても
セメンタイト共晶の発生とチル化を確実に防止すること
を目的とする。An object of the present invention is to reliably prevent the generation of cementite eutectic and chilling even in thin-walled pipes during continuous casting of cast iron pipes.
［発明が解決しようとする課題１
請求項１に記載の本発明は、溶湯保持炉の鋳込口に設け
た鋳型装置により溶湯を冷却して鋳鉄管を形成し、この
鋳鉄管を引抜鋳造する鋳鉄管の連続鋳造方法において、
溶湯の化学成分をＳｃ値１．００〜１．１５、Ｃ量３．
６〜４．０％、Ｓｉ量２．０〜２．４％、Ｍｎ量０．１
〜０．５％に調整するようにしたものである。[Problem to be Solved by the Invention 1] The present invention as set forth in claim 1 cools the molten metal to form a cast iron pipe using a molding device provided at the inlet of a molten metal holding furnace, and then pultrusion casts the cast iron pipe. In the continuous casting method of cast iron pipes,
The chemical composition of the molten metal is Sc value 1.00 to 1.15 and C content 3.
6 to 4.0%, Si content 2.0 to 2.4%, Mn content 0.1
The content was adjusted to 0.5%.
請求項２に記載の本発明は、溶湯保持炉の鋳込口に設け
た鋳型装置により溶湯を冷却して鋳鉄管を形成し、この
鋳鉄管を引抜鋳造する鋳鉄管の連続鋳造方法において、
溶湯の化学成分をＳｃ値１．００〜！、１５、Ｃ量３．
６〜４．０％、Ｓｉ量２．０〜２．４％、Ｍｎ量０．１
−’０．５％に調整し、さらに溶湯に対しＳｉ量０．１
−０．３％の接種剤を接種するようにしたものである。The present invention as set forth in claim 2 provides a continuous casting method for cast iron pipes, in which a cast iron pipe is formed by cooling the molten metal using a molding device provided at a pouring port of a molten metal holding furnace, and the cast iron pipe is drawn and cast.
The chemical composition of the molten metal has a Sc value of 1.00~! , 15, C amount 3.
6 to 4.0%, Si content 2.0 to 2.4%, Mn content 0.1
-'Adjusted to 0.5%, and furthermore, the amount of Si was adjusted to 0.1% relative to the molten metal.
-0.3% inoculant is inoculated.
請求項３に記載の本発明は、前記接種剤がワイヤをなし
、鋳型装置が設けられる鋳込口の直前に供給されるよう
にしたものである。According to a third aspect of the present invention, the inoculant is in the form of a wire and is supplied immediately before a casting opening where a molding device is provided.
［作用］
請求項１に記載の本発明によれば、溶湯の成分が鋳鉄管
の連続鋳造のために最適化され、薄肉管についても、セ
メンタイト共晶の発生とチル化を確実に防止することが
できる。[Function] According to the present invention as set forth in claim 1, the composition of the molten metal is optimized for continuous casting of cast iron pipes, and generation of cementite eutectic and chilling can be reliably prevented even in thin-walled pipes. I can do it.
請求項２に記載の本発明によれば、溶湯の成分と接種態
様が鋳鉄管の連続鋳造のために最適化され、薄肉管につ
いても、セメンタイト共晶の発生とチル化を確実に防止
することができる。According to the present invention as set forth in claim 2, the composition of the molten metal and the inoculation mode are optimized for continuous casting of cast iron pipes, and generation of cementite eutectic and chilling can be reliably prevented even in thin-walled pipes. I can do it.
請求項３に記載の本発明によれば、溶湯の保持時間が長
い場合にも、鋳型装置に鋳込まれる直前の溶湯に対して
接種が行なわれ、良好な接種効果を得ることができる。According to the third aspect of the present invention, even when the molten metal is held for a long time, inoculation is performed on the molten metal immediately before it is cast into the mold device, and a good inoculation effect can be obtained.
したがって、薄肉管についても、セメンタイト共晶の発
生とチル化をより確実に防止することができる。Therefore, generation of cementite eutectic and chilling can be more reliably prevented even in the case of thin-walled tubes.
なお、本発明における溶湯成分および接種態様の限定理
由は以下のとおりである。The reasons for limiting the molten metal components and inoculation mode in the present invention are as follows.
（１）Ｓｃ （炭素飽和度）（１，００〜１．１５）■
状態図より明らかなように凝固初期に［ＣＩを晶出させ
るためには過共晶とする必要があり、Ｓｃを１．００以
上とする必要がある。(1) Sc (carbon saturation) (1,00-1.15) ■
As is clear from the phase diagram, in order to crystallize [CI] at the early stage of solidification, it is necessary to form a hypereutectic state, and Sc needs to be 1.00 or more.
■連続鋳造において、溶融温度と凝固温度の差が１００
℃以上のものは、強固な凝固殻が得られず、ダミーパー
による引抜力と鋳型との間の摩擦力によって発生する力
に凝固殻が抗しきれずに破壊し、安定した連続鋳造が実
現されない。溶融温度は知られているようにＳｃの上昇
にともなって上昇し、凝固温度との差をｔｏｏ’ｃ以下
とするためには、本発明の成分範囲ではＳｃを１．１５
以下とする必要がある。■In continuous casting, the difference between melting temperature and solidification temperature is 100
If the temperature exceeds ℃, a strong solidified shell cannot be obtained, and the solidified shell cannot resist the force generated by the pulling force of the dummy par and the frictional force between the mold and breaks, making it impossible to achieve stable continuous casting. As is known, the melting temperature increases as the Sc rises, and in order to keep the difference from the solidification temperature to below too'c, the Sc should be set at 1.15 in the composition range of the present invention.
It is necessary to do the following.
（２）［ＣＩ （３，ｓ〜４．０％）［ＣＩは黒鉛化
促進元素であり、チル発生防止のためには高いほうが好
ましい、ただし、Ｓｃ値と同様、あまり高すぎると、固
液共存域が拡大され連続鋳造が困難になることより上限
を４．０％とした。(2) [CI (3,s~4.0%) [CI is an element that promotes graphitization, and a higher value is preferable in order to prevent chill generation. However, like the Sc value, if it is too high, solid-liquid The upper limit was set at 4.0% because the coexistence region would expand and continuous casting would be difficult.
なお、Ｓｃは、（１）式で示されるが、炭素量の下限は
、Ｓｃの下限値１．０および、Ｓｉの上限値２．４％よ
り必然的に３．６％に限定される。Note that although Sc is expressed by the formula (1), the lower limit of carbon content is necessarily limited to 3.6% due to the lower limit of Sc of 1.0 and the upper limit of Si of 2.4%.
（３）［Ｓｉ］ （２，０〜２．４％）［Ｓｉｌは、
［ＣＩと同様、黒鉛化促進元素であり、チル発生防止の
ためには高いほうが好ましい、連続鋳造の場合、砂型鋳
物に比べ冷却速度が大きいため、２．０％以下ではその
効果が薄い。(3) [Si] (2.0-2.4%) [Sil is
[Similar to CI, it is an element that promotes graphitization, and a higher concentration is preferable to prevent chill generation.In the case of continuous casting, the cooling rate is higher than in sand casting, so if it is less than 2.0%, the effect is weak.
よってその下限を２．０％とした。Therefore, the lower limit was set to 2.0%.
一方、Ｓｉ量が多すぎると［Ｓｉ］のフェライト基地中
への固溶強化゛作用により硬度が高くなりすぎて脆くな
るので、材料として好ましくないことより上限を２．４
％に設定した。On the other hand, if the amount of Si is too large, the hardness becomes too high due to the solid solution strengthening effect of [Si] in the ferrite base, making it brittle.
It was set to %.
（４） ［Ｍｎｌ （０，１〜０．５％）［Ｍ ｎ
］は、チル化促進元素であり低いほうが望ましく、０
．５％以下とする。一方、鋳鉄において［Ｍｎｌは不可
避元素であり、０．１％以下とすることは経済的でない
、よってその下限を０．１％とした。(4) [Mnl (0.1-0.5%) [Mnl
] is a chilling-promoting element, and the lower the value, the better.
．． 5% or less. On the other hand, in cast iron, Mnl is an unavoidable element, and it is not economical to keep it below 0.1%, so the lower limit was set at 0.1%.
（５）接種（０，１〜０．３％）
鋳鉄の製造において接種は不可欠であるが、０．１％以
下では、その効果は薄く、０．５％以上ではひけ巣等の
鋳造欠陥が増加することが知られている０本発明では、
注湯口近傍で［Ｓｉｌを添加するため、接種効果は大き
く、０．３％以下で充分である。よってその下限を０．
１％、その上限を０．３％とした。(5) Inoculation (0.1-0.3%) Inoculation is essential in the production of cast iron, but if it is less than 0.1%, its effect is weak, and if it is more than 0.5%, casting defects such as shrinkage cavities may occur. In the present invention,
Since [Sil is added near the pouring port, the inoculation effect is large, and 0.3% or less is sufficient. Therefore, set the lower limit to 0.
1%, with an upper limit of 0.3%.
［実施例］
第１図は本発明の一実施例を示す模式図、第２図は鋳型
装置を示す断面図、第３図は鋳型装置を示す端面図であ
る。[Example] Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing a mold device, and Fig. 3 is an end view showing the mold device.
連続鋳造装置１０は、第１図に示す如く、溶湯保持炉１
１の側面下部に形成した鋳込口１２に鋳型装置１３を付
帯して配設している。連続鋳造装置１０は、鋳型装置１
３により溶湯を冷却して鋳鉄管１４を形成し、これを引
抜き鋳造する。As shown in FIG. 1, the continuous casting apparatus 10 includes a molten metal holding furnace 1.
A mold device 13 is attached to a casting hole 12 formed at the lower side of the mold. The continuous casting device 10 includes a mold device 1
3, the molten metal is cooled to form a cast iron pipe 14, which is drawn and cast.
連続鋳造装置ｌＯは、鋳型装置１３の出側にて鋳鉄管１
４を支持するガイドローラー１５を備えるとともに、鋳
鉄管１４を間欠的に引抜くための引抜装置１６を備える
。引抜装置１６は、ピンチローラ−１７と押えローラー
１８とからなる。The continuous casting device 1O casts a cast iron pipe 1 at the exit side of the mold device 13.
4 and a pulling device 16 for pulling out the cast iron pipe 14 intermittently. The pulling device 16 consists of a pinch roller 17 and a press roller 18.
鋳型装置１３は、第２図、第３図に示す如く。The molding device 13 is as shown in FIGS. 2 and 3.
黒鉛からなる鋳型１９と同じく黒鉛からなる中子２０と
により構成されている。It is composed of a mold 19 made of graphite and a core 20 also made of graphite.
鋳型１９は、中空状をなし、溶湯流入側端部に中子保持
内径部２１を備えるとともに、中子保持内径部２１を除
く略全長にわたる鋳型中心軸まわりに管外面成形内径部
２２を備える。The mold 19 has a hollow shape and includes a core holding inner diameter part 21 at the end on the molten metal inflow side, and a tube outer surface forming inner diameter part 22 around the mold center axis extending substantially over the entire length excluding the core holding inner diameter part 21.
中子２０は、鋳型１９に装入され、溶湯流入側端部に鋳
型１９の中子保持内径部２１に嵌着されるフランジ部２
３を備えるとともに、フランジ部２３を除く略全長にわ
たる鋳型中心軸まわりに設けられて鋳型１９の管外面成
形内径部２２どの間に管成形通路２５を形成する管内面
成形外径部２４を備える。また中子２０は、フランジ部
２３における鋳型中心軸まわりの複数位置（この実施例
マは４位置）のそれぞれに上記管成形通路２５に連通す
る溶湯注入通路２６を備える。各溶湯注入通路２６の通
路断面形状は円弧状である。なお、隣接する溶湯注入通
路２６に挟まれる継なぎ部２７の厚みｇは強度上杵され
る限り小とし、各溶湯注入通路２６の通路面積をより大
とすることが好ましい。The core 20 is inserted into the mold 19, and the flange portion 2 is fitted into the core holding inner diameter portion 21 of the mold 19 at the end on the molten metal inflow side.
3, and a tube inner surface molding outer diameter section 24 that is provided around the center axis of the mold over substantially the entire length excluding the flange portion 23 and forming a tube molding passage 25 between the tube outer surface molding inner diameter section 22 of the mold 19. The core 20 also includes molten metal injection passages 26 communicating with the tube forming passage 25 at each of a plurality of positions (four positions in this embodiment) around the center axis of the mold in the flange portion 23 . Each molten metal injection passage 26 has a cross-sectional shape of an arc. It is preferable that the thickness g of the joint portion 27 sandwiched between adjacent molten metal injection passages 26 be as small as possible to ensure strength, and that the passage area of each molten metal injection passage 26 be made larger.
すなわち、鋳型装置１３は、鋳型１９の中子保持内径部
２１に中子２０のフランジ部２３を嵌着固定し、前記溶
湯注入通路２６と管成形通路２５とをストレート状に連
通ずる。第２図の２８は鋳型１９と中子２０との固定ビ
ンである。That is, in the mold device 13, the flange portion 23 of the core 20 is fitted and fixed to the core holding inner diameter portion 21 of the mold 19, and the molten metal injection passage 26 and the tube forming passage 25 are communicated in a straight manner. 28 in FIG. 2 is a fixing bottle for the mold 19 and the core 20.
なお、鋳型装置１３は、具体的には、鋳型１９の溶湯流
出側端部に黒鉛ライナー２９を介して銅製の水冷ジャケ
ット体３０を嵌着するとともに、鋳型１９の溶湯流入側
端部にレンガからなるインサートリング３１．３２を嵌
着し、また水冷ジャケット体３０とインサートリング３
１の間に鉄板３３を嵌着することとしている。これによ
り、鋳型装置１３は、水冷ジャケット体３０の部分を溶
湯を凝固形成させるための冷却部、インサートリング３
１の部分を非冷却部、インサートリング３２の部分を保
持炉１１の炉壁１１Ａへの装着部としている。Specifically, the mold device 13 includes a copper water cooling jacket 30 fitted to the molten metal outflow side end of the mold 19 via a graphite liner 29, and a copper water cooling jacket body 30 fitted to the molten metal inflow side end of the mold 19 from a brick. The insert rings 31 and 32 are fitted, and the water cooling jacket body 30 and the insert ring 3 are fitted.
1, an iron plate 33 is fitted between them. As a result, the mold device 13 serves as a cooling section for solidifying and forming the molten metal in the water-cooled jacket body 30 and insert ring 3.
1 is a non-cooled part, and the insert ring 32 part is a part attached to the furnace wall 11A of the holding furnace 11.
また、この実施例の連続鋳造装置１０は、鋳型装置１３
に流入した溶湯が過冷却することのないように、中子２
０の溶湯流入側端部に礼状のぬすみ２０Ａを設けるとと
もに、鋳型装置１３の端部を炉内へ突出させている。Further, the continuous casting apparatus 10 of this embodiment has a mold apparatus 13.
To prevent the molten metal flowing into the core from being supercooled,
A thank-you note 20A is provided at the molten metal inflow side end of the mold 1, and the end of the mold device 13 protrudes into the furnace.
さらに、連続鋳造装置１０は、ワイヤフィーダ１００を
備え、ワイヤ状の接種剤１０１を自動供給できる。接種
剤１０１は、純Ｓｉ、Ｆｅ−５ｉ、Ｃａ−５ｔ等が用い
られる。接種剤ｉｏｉは１例えば普通鋼の薄板を横断面
内にて丸めた内部にＳｉを充填したものを、長手方向に
連続化したワイヤ状とされ、第１図に示す如く、鋳型装
置１３が設けられている鋳込口１２の直前に挿入して供
給される。Furthermore, the continuous casting apparatus 10 includes a wire feeder 100 and can automatically supply a wire-shaped inoculant 101. As the inoculant 101, pure Si, Fe-5i, Ca-5t, etc. are used. The inoculant ioi is made into a wire shape, for example, made by rolling a thin plate of ordinary steel in its cross section and filling it with Si, which is made continuous in the longitudinal direction, and a mold device 13 is installed as shown in FIG. It is inserted and supplied just in front of the casting hole 12 where it is placed.
次に本発明の操業実施例について説明する。Next, an operational example of the present invention will be described.
この連続鋳造装置１０の操業において、溶湯の化学成分
をＳｃ［１，１３、Ｔ、Ｃ量３．８５％、Ｓｉ量２．３
１％、Ｍｎ量０．４３％として、連続鋳造を実施したと
ころ、セメンタイト共晶の発生とチル化のない正常な黒
鉛組織を有する鋳鉄管を連続８時間鋳造することができ
た。In the operation of this continuous casting apparatus 10, the chemical components of the molten metal are Sc[1,13, T, C content 3.85%, Si content 2.3%,
When continuous casting was carried out with an Mn content of 1% and an Mn content of 0.43%, a cast iron pipe having a normal graphite structure without the occurrence of cementite eutectic and chilling could be continuously cast for 8 hours.
また、Ｓｃ値１．０４、Ｔ、Ｃ量３，７２％、Ｓｉ量２
．１０％、Ｍｎ量０．３１％とし、Ｓｉ量０．２５％の
接着剤１０１をホスホライザーまたはワイヤーで接種し
て連続鋳造を実施したところ、セメンタイト共晶の発生
とチル化のない正常な黒鉛組織を有する鋳鉄管を連続１
０時間鋳造することができた。In addition, Sc value 1.04, T, C content 3.72%, Si content 2
．． When continuous casting was carried out by inoculating Adhesive 101 with 10% Mn content, 0.31% Mn content, and 0.25% Si content using a phosphorizer or wire, normal graphite with no cementite eutectic generation or chilling was obtained. Continuous cast iron pipe with structure 1
It was possible to cast for 0 hours.
一方、Ｓｃ値０．８７、Ｔ、Ｃ量３．５１％、Ｓｉ量２
．０１％、Ｍｎ量０．２４％にてこの連続鋳造装置１０
の操業を実施したところ、鋳型装置内で生ずる急冷効果
のため、セメンタイト共晶が激しく、チル化が生じ、操
業開始後１時間以内に亀裂が入り、操業不能に陥った。On the other hand, Sc value 0.87, T, C content 3.51%, Si content 2
．． 01%, Mn amount 0.24%.
When this operation was carried out, due to the rapid cooling effect that occurred in the mold equipment, cementite eutectic formation was intense and chilling occurred, and cracks appeared within one hour after the start of operation, making it impossible to operate.
また、Ｓｃ値１．１８、Ｃ量４．０９％、Ｓｉ量２．５
３％、Ｍｎ量０．３２％にてこの連続鋳造装置１０の操
業を実施したところ、操業開始後数分でブレークアウト
が発生し、操業不能に陥った。In addition, Sc value 1.18, C content 4.09%, Si content 2.5
When this continuous casting apparatus 10 was operated with an Mn content of 3% and an Mn content of 0.32%, a breakout occurred within a few minutes after the start of operation, and the operation became impossible.
しかして、この連続鋳造装置１０の操業時には、溶湯の
化学成分をＳｃ値１．００〜！、１５、Ｃ量３．８〜４
．０％、Ｓｉ量２．０〜２．４％、Ｍｎ量０．１〜０．
５％に調整するものとされている。これらの数値限定理
由は前述のとおりである。However, during operation of this continuous casting apparatus 10, the chemical composition of the molten metal is adjusted to an Sc value of 1.00~! , 15, C amount 3.8-4
．． 0%, Si amount 2.0-2.4%, Mn amount 0.1-0.
It is expected to be adjusted to 5%. The reason for these numerical limitations is as described above.
また、この連続鋳造装置１０の操業時には、溶湯の成分
を上記の如く調整することに加え、溶湯に対しＳｉ量０
．１〜０．３％の接種剤ｌｏｔを接種することができる
。この数値限定理由も前述のとおりである。During operation of this continuous casting apparatus 10, in addition to adjusting the components of the molten metal as described above, the amount of Si in the molten metal is 0.
．． A 1-0.3% inoculum lot can be inoculated. The reason for this numerical limitation is also as described above.
次に、上記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.
上記実施例によれば、溶湯の成分が鋳鉄管１４の連続鋳
造のために最適化され、薄肉管についても、セメンタイ
ト共晶の発生とチル化を確実に防１卜することができる
。According to the embodiment described above, the composition of the molten metal is optimized for continuous casting of cast iron pipes 14, and even in thin-walled pipes, generation of cementite eutectic and chilling can be reliably prevented.
また上記実施例によれば、溶湯の成分に加え、接種態様
も鋳鉄管１４の連続鋳造のために最適化でき、薄肉管に
ついても、セメンタイト共晶の発生とチル化を確実に防
止することができる。Further, according to the above embodiment, in addition to the composition of the molten metal, the inoculation mode can also be optimized for continuous casting of the cast iron pipe 14, and even for thin-walled pipes, generation of cementite eutectic and chilling can be reliably prevented. can.
また上記実施例によれば、ワイヤ状の接種剤１０１を鋳
型装置１３に鋳込まれる直前の溶湯に対して接種するこ
ととなり、溶湯の保持時間が長い場合にも、良好な接種
効果を得ることができル、シたがって、薄肉管について
も、セメンタイト共晶の発生とチル化をより確実に防止
することができる。Further, according to the above embodiment, the wire-shaped inoculant 101 is inoculated into the molten metal immediately before being cast into the mold device 13, and a good inoculation effect can be obtained even when the molten metal is held for a long time. Therefore, generation of cementite eutectic and chilling can be more reliably prevented even in thin-walled pipes.
［発明の効果］
以上のように本発明によれば、鋳鉄管の連続鋳造に際し
、薄肉管についてもセメンタイト共晶の発生とチル化を
確実に防止することができる。[Effects of the Invention] As described above, according to the present invention, during continuous casting of cast iron pipes, generation of cementite eutectic and chilling can be reliably prevented even in thin-walled pipes.
第１図は本発明の一実施例を示す模式図、第２図は鋳型
装置を示す断面図、第３図は鋳型装置を示す端面図であ
る。
ＩＯ・・・連続鋳造装置、
１１・・・溶湯保持炉、
１２・・・鋳込口、
１３・・・鋳型装置、
１４・・・鋳鉄管、
１００・・・ワイヤフィーダ。
１０１・・・接種剤。
代理人 弁理士 塩 川 修 治
第２図FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a sectional view showing a molding device, and FIG. 3 is an end view showing the molding device. IO... Continuous casting device, 11... Molten metal holding furnace, 12... Casting port, 13... Mold device, 14... Cast iron pipe, 100... Wire feeder. 101... Inoculant. Agent Patent Attorney Osamu Shiokawa Figure 2
Claims (3)
を冷却して鋳鉄管を形成し、この鋳鉄管を引抜鋳造する
鋳鉄管の連続鋳造方法において、溶湯の化学成分をＳｃ
値１．００〜１．１５、Ｃ量３．６〜４．０％、Ｓｉ量
２．０〜２．４％、Ｍｎ量０．１〜０．５％に調整する
ことを特徴とする鋳鉄管の連続鋳造方法。(1) In a continuous casting method for cast iron pipes, in which the molten metal is cooled by a mold device installed at the pouring port of a molten metal holding furnace to form a cast iron pipe, and the cast iron pipe is drawn and cast, the chemical composition of the molten metal is
Cast iron characterized by adjusting the value to 1.00 to 1.15, C content 3.6 to 4.0%, Si content 2.0 to 2.4%, and Mn content 0.1 to 0.5%. Continuous casting method for tubes.
を冷却して鋳鉄管を形成レ、この鋳鉄管を引抜鋳造する
鋳鉄管の連続鋳造方法において、溶湯の化学成分をＳｃ
値１．００〜１．１５、Ｃ量３．６〜４．０％、Ｓｉ量
２．０〜２．４％、Ｍｎ量０．１〜０．５％に調整し、
さらに溶湯に対しＳｉ量０．１〜０．３％の接種剤を接
種することを特徴とする鋳鉄管の連続鋳造方法。(2) In a continuous casting method for cast iron pipes in which a cast iron pipe is formed by cooling the molten metal using a mold device installed at the pouring port of a molten metal holding furnace, and the cast iron pipe is drawn and cast, the chemical composition of the molten metal is
Adjusted to a value of 1.00 to 1.15, a C content of 3.6 to 4.0%, a Si content of 2.0 to 2.4%, and a Mn content of 0.1 to 0.5%.
A continuous casting method for cast iron pipes, which further comprises inoculating the molten metal with an inoculant having an Si content of 0.1 to 0.3%.
る鋳込口の直前に供給される請求項２記載の鋳鉄管の連
続鋳造方法。(3) The continuous casting method for cast iron pipes according to claim 2, wherein the inoculant is in the form of a wire and is supplied immediately before a casting opening where a molding device is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14350288A JPH01313147A (en) | 1988-06-13 | 1988-06-13 | Method for continuously casting cast iron tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14350288A JPH01313147A (en) | 1988-06-13 | 1988-06-13 | Method for continuously casting cast iron tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01313147A true JPH01313147A (en) | 1989-12-18 |
Family
ID=15340216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14350288A Pending JPH01313147A (en) | 1988-06-13 | 1988-06-13 | Method for continuously casting cast iron tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01313147A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS521881A (en) * | 1975-06-23 | 1977-01-08 | Daijiro Naka | Oil transport device for oil tanker |
| JPS56150111A (en) * | 1980-04-22 | 1981-11-20 | Kubota Ltd | Continuous casting method of spherical graphite cast iron article having ferrite structure |
| JPS58193308A (en) * | 1982-05-06 | 1983-11-11 | Nippon Steel Corp | Horizontal continuous casting method of cast iron |
| JPS6319951B2 (en) * | 1981-04-24 | 1988-04-25 | Hitachi Ltd |
-
1988
- 1988-06-13 JP JP14350288A patent/JPH01313147A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS521881A (en) * | 1975-06-23 | 1977-01-08 | Daijiro Naka | Oil transport device for oil tanker |
| JPS56150111A (en) * | 1980-04-22 | 1981-11-20 | Kubota Ltd | Continuous casting method of spherical graphite cast iron article having ferrite structure |
| JPS6319951B2 (en) * | 1981-04-24 | 1988-04-25 | Hitachi Ltd | |
| JPS58193308A (en) * | 1982-05-06 | 1983-11-11 | Nippon Steel Corp | Horizontal continuous casting method of cast iron |
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