JPH0659522B2 - Mold for continuous casting - Google Patents
Mold for continuous castingInfo
- Publication number
- JPH0659522B2 JPH0659522B2 JP61212938A JP21293886A JPH0659522B2 JP H0659522 B2 JPH0659522 B2 JP H0659522B2 JP 61212938 A JP61212938 A JP 61212938A JP 21293886 A JP21293886 A JP 21293886A JP H0659522 B2 JPH0659522 B2 JP H0659522B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- mold
- nickel
- chromium
- continuous 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.)
- Expired - Lifetime
Links
- 238000009749 continuous casting Methods 0.000 title claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 42
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 23
- 229910052759 nickel Inorganic materials 0.000 claims description 21
- 239000011651 chromium Substances 0.000 claims description 17
- 229910052804 chromium Inorganic materials 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 4
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 238000005266 casting Methods 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical class O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明はメニスカス部付近のヒートクラック発生防止、
あるいは溶鋼の焼付防止、更には鋳型下方部に於ける摩
耗防止等の耐久性要件を具備すると共に、その様な耐久
性に付与するが為に施す鋳型本体への表面処理に起因し
て起こる特有の問題である熱腐食をも回避した連続鋳造
用鋳型に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is directed to preventing the occurrence of heat cracks near the meniscus portion,
Alternatively, it has a durability requirement such as seizure prevention of molten steel and further wear prevention in the lower part of the mold, and it is a characteristic that occurs due to the surface treatment on the mold main body to give such durability. The present invention relates to a continuous casting mold that avoids the problem of thermal corrosion.
＜従来の技術及びその問題点＞ 連続鋳造用鋳型としては、その冷却性の面から熱伝導性
の良好な銅若しくはその合金を基材とし、かつその溶鋼
注入面を各種金属にて表面処理をしヒートクラックの発
生を抑える、あるいは耐摩耗性を付与する等の手段が採
られている。その中で銅若しくは銅合金面上にニッケル
メッキ層を施し、更にその上面にクロムメッキ層を施し
た例として特公昭５４−３７５６２号公報で示される例
があり、更に又特公昭５２−５０７３４号公報で示され
る様に中間層として用いるニッケル合金の組成をより具
体的に示した例、及びそれらの中間層の施し方に工夫を
こらした実開昭５８−３８３５４号公報で示される様な
例もある。<Prior art and its problems> As a casting mold for continuous casting, copper or its alloy having good thermal conductivity is used as a base material in terms of its cooling property, and its molten steel injection surface is surface-treated with various metals. However, measures such as suppressing the generation of heat cracks or imparting abrasion resistance are adopted. Among them, as an example in which a nickel plating layer is applied on the copper or copper alloy surface and a chrome plating layer is applied on the upper surface, there is an example shown in JP-B-54-37562, and JP-B-52-50734. As shown in the official gazette, an example in which the composition of the nickel alloy used as the intermediate layer is more specifically shown, and an example as shown in Japanese Utility Model Laid-Open No. 58-38354 in which the method of applying the intermediate layer is devised. There is also.
ところが、これらの先行技術は、最外層であるクロム層
以外の中間層の組成や、その施し方は種々検討されてい
るものの、最外層たるクロム層は全て鋳型全面に渡って
設けられている。このクロム層は確かに溶鋼鋳込み初期
の耐スプラッシュ対策や幅可変型鋳型として用いる場合
の初期の可変疵防止としての役割は果たすものの、耐摩
耗性の点では従来から中間層として用いられているニッ
ケルやその合金と比し劣るものであり、従って鋳型の下
方部に於いてはさして重要な働きをする事はない。そし
て更に本発明者等の研究によれば、鋳型の下方部に於い
ては逆にこのクロム層があることの方が問題がある事が
判明したのである。即ち、鋳型の下半部、特に下方部で
は溶鋼はその外周部は既に凝固して、相当硬い凝固シェ
ルを形成し、該凝固シェルによって最外層としてのクロ
ム層は早い段階で損傷せしめられ、その後は中間層であ
るニッケル若しくはその合金層により耐摩耗性を受持つ
が、クロム層が部分的に損傷した場合に、残存クロム層
とその下地の中間層との間で局部電池が形成され、本来
ならば耐摩耗が大なる中間層が化学的に侵され、結果と
して鋳型寿命を短く、あるいは不安定なものとするので
ある。この点につき本発明者等が行った実験及びその結
果を述べ乍ら、更に詳述すれば次の通りである。即ち、
幅2000mm×高さ900mm の銅製鋳型本体の表面に1.0mm 厚
のニッケル電気メッキ層を施し、更にその上面全域に一
様に30μｍ厚のクロム電気メッキ層を施した連続鋳造用
鋳型300 枚について、１チャージ当たり150 トンの条件
で実機テストをした結果、熱腐食の発生位置及びその場
合の鋳型寿命等の関係は下記第１表の如くであった。However, in these prior arts, although the composition of the intermediate layer other than the chromium layer which is the outermost layer and the method of applying it have been variously studied, the chromium layer as the outermost layer is provided over the entire surface of the mold. Although this chrome layer certainly plays a role as a splash resistance measure in the early stages of molten steel casting and as an initial variable flaw preventive when used as a variable width mold, in terms of wear resistance, it has been conventionally used as an intermediate layer for nickel. It is inferior to that and its alloys and therefore does not play any significant role in the lower part of the mold. Further, according to the research conducted by the present inventors, it was found that the presence of the chromium layer in the lower portion of the mold was more problematic. That is, in the lower half part of the mold, especially in the lower part, the molten steel has already solidified the outer peripheral part thereof to form a considerably hard solidified shell, and the solidified shell causes the chromium layer as the outermost layer to be damaged at an early stage, and thereafter. Wears the wear resistance of the intermediate layer of nickel or its alloy layer.However, when the chromium layer is partially damaged, a local battery is formed between the residual chromium layer and the underlying intermediate layer. In that case, the intermediate layer having high wear resistance is chemically attacked, resulting in shortened mold life or instability. With respect to this point, the experiments conducted by the present inventors and the results thereof will be described and further detailed as follows. That is,
About 300 continuous casting molds with a 1.0 mm thick nickel electroplating layer on the surface of a copper mold body with a width of 2000 mm and a height of 900 mm, and a chromium electroplating layer with a uniform thickness of 30 μm on the entire upper surface, As a result of an actual machine test under the condition of 150 tons per charge, the relationship between the location of thermal corrosion and the mold life in that case is as shown in Table 1 below.
この第１表に示す様に、鋳型の下半部、特に下端から全
長の1/3 以下の部分に於いて、熱腐食が多発するのは、
この部分では凝固シェルによる摩耗が激しく、クロム層
はそれが部分的に消滅し、そこへ２次冷却水や溶融パウ
ダー等の電解質物質が介入し、下地のニッケルとの間に
局部電池が形成される結果と考えられる。そしてこの場
合に於ける局部電池による熱腐食作用は、一部残存して
いるクロム層は酸化膜を作り、不働態化しており、この
クロム酸化膜が陰極、一方下地のニッケルが陽極とな
り、陽極であるニッケルが溶出し、そこが孔食されるも
のと考えられる。そしてその様にして中間層たるニッケ
ルが無くなる事で、それらの中間層の本来の目的である
耐摩耗性も消失し、鋳型寿命が短くなるものと考えられ
る。 As shown in Table 1, thermal corrosion frequently occurs in the lower half part of the mold, especially in the part less than 1/3 of the total length from the lower end,
In this part, wear due to the solidified shell is severe, and the chromium layer partially disappears, and electrolyte substances such as secondary cooling water and molten powder intervene there, forming a local battery with the underlying nickel. It is thought that this is the result. The thermal corrosion effect of the local battery in this case is that the partially remaining chromium layer forms an oxide film and is passivated.This chromium oxide film serves as the cathode, while the underlying nickel serves as the anode, and the anode It is considered that nickel, which is, elutes and is pitted. It is considered that, by eliminating nickel as the intermediate layer in this way, the original purpose of these intermediate layers, namely, the wear resistance, is also lost, and the mold life is shortened.
本発明では、上述のニッケルからなる中間層（第１層）
上の全面にクロム層（第２層）を施す事に起因する局部
電池形成という問題点を解決する連続鋳造用鋳型を提供
する事を目的とする。In the present invention, the intermediate layer (first layer) made of the above nickel
An object of the present invention is to provide a continuous casting mold that solves the problem of local battery formation caused by applying a chromium layer (second layer) on the entire upper surface.
＜問題点を解決する為の手段＞ 上記本発明の目的を達成し、かつその他連続鋳造用鋳型
としての具備すべき特性は失われない為に本発明で採用
する鋳型は、銅若しくは銅合金製鋳型本体の溶鋼との接
触面上に、ニッケルからなる第１層を設け、該第１層の
上面であって鋳型本体の上端から、同中央部よりはやゝ
下方部までに渡ってクロムからなる第２層を設けたこと
を特徴とする連続鋳造用鋳型及び銅若しくは銅合金製鋳
型本体の溶鋼との接触面に、ニッケルからなる第１層を
設け、該第１層の下半部のニッケル表面にニッケル−ク
ロム自溶性合金の溶射層からなる第２層を設けると共
に、前記第１層の上半分のニッケル表面にクロムからな
る第２層を設けたことを特徴とする連続鋳造用鋳型であ
る。<Means for Solving the Problems> The mold adopted in the present invention is made of copper or a copper alloy in order to achieve the above-mentioned object of the present invention and not to lose other properties that the continuous casting mold should have. A first layer made of nickel is provided on the contact surface of the mold body with the molten steel. From the upper surface of the first layer and the upper end of the mold body, to a portion slightly lower than the central portion, chromium is provided. A second layer is formed on the contact surface of the continuous casting mold and the copper or copper alloy mold body with molten steel, the first layer made of nickel is provided, and the lower half of the first layer is provided. A casting mold for continuous casting, characterized in that a second layer consisting of a sprayed layer of a nickel-chromium self-fluxing alloy is provided on the nickel surface, and a second layer consisting of chromium is provided on the nickel surface of the upper half of the first layer. Is.
以下本発明の連続鋳造用鋳型について詳述する。Hereinafter, the continuous casting mold of the present invention will be described in detail.
本発明では、連続鋳造用鋳型が実際の使用中に受ける、
各部のヒートクラック発生，溶鋼の焼付そして摩耗等の
各種損傷の度合を実験的に確認し、それに耐え得る様
に、第１層及び第２層を装着したものであり、その実験
の結果によれば、鋳型の上下方向の中間部よりも上方域
では、特に鋳込み初期に於ける溶鋼の焼付や、ヒートク
ラックの発生を防止する為に第２層であるクロム層が必
要であるが、下半部、特に下端から1/3 以下の部所に於
いては、殆ど焼付きやヒートクラックの発生という事は
なく、専ら凝固シェルによる摩耗があるのみであるので
耐摩耗性があればよく、逆にクロム層であれば前記した
局部電池形成に起因する孔食があるのでクロム層は設け
ない方がよいという事が判ったのである。In the present invention, the continuous casting mold receives during actual use,
The degree of various damages such as heat crack generation, molten steel seizure and abrasion of each part was experimentally confirmed, and the first layer and the second layer were attached so as to withstand the damages. For example, in the upper region of the mold in the vertical direction, the chromium layer, which is the second layer, is necessary in order to prevent the seizure of molten steel and the occurrence of heat cracks especially in the initial stage of casting, but the lower half In the part, especially in the part less than 1/3 from the lower end, there is almost no seizure or heat crack, and only the solidified shell causes wear. It has been found that it is better not to provide the chrome layer because a chrome layer would cause pitting corrosion due to the formation of the local battery.
また、実施例IIで示すように、鋳型の下半分に第２層と
してニッケル−クロム自溶性合金の溶射層を形成する場
合には前述のクロムを第２層とする時のような孔食は発
生せず、しかも耐摩耗性がすぐれていることも判った。Further, as shown in Example II, when a sprayed layer of a nickel-chromium self-fluxing alloy is formed as the second layer on the lower half of the mold, the above-mentioned pitting corrosion when the chromium is used as the second layer It was also found that it did not occur and had excellent wear resistance.
＜実施例＞ 実施例Ｉ 第１図に示す様な幅2500mm、長さ900mm の銅製長辺鋳型
(1)の表面に電気ニッケルメッキ(2)を上部0.5mm 、下部
1.0mm となるようテーパー状にメッキしたものゝ表面に
長さ900mm のうちの上部500mm にクロムメッキ(3)を30
μｍメッキした鋳型で、全く熱腐食が発生せず、下部の
ニッケルが自然摩耗により摩耗し素地の銅が露出するま
で670 チャージ異常なく使われた。<Example> Example I A copper long-side mold having a width of 2500 mm and a length of 900 mm as shown in FIG.
Electro-nickel plating (2) on the surface of (1) 0.5mm on top, bottom
Plated in a taper shape to 1.0 mm-The surface is 900 mm long and the upper 500 mm is plated with chrome plating (3) 30
With the μm-plated mold, no thermal corrosion occurred at all, and the lower nickel was worn by natural wear and the copper of the base was exposed 670 without any abnormal charge.
実施例II 第２図に示す様な幅200mm 、長さ900mm の析出硬化型銅
による短辺鋳型(1)の表面に0.1mm のニッケル(2)を施
し、更にその下半分のニッケル表面に上0.3mm 、下0.6
mmの厚みでニッケル−クロム自溶性合金(4)を溶射し溶
体化処理後時効処理を施した後、上部半分のニッケル側
表面のみクロムメッキ(3)を20μｍ施した鋳型におい
て、まったく熱腐食無く1800チャージ使用された。Example II 0.1 mm of nickel (2) was applied to the surface of a short side mold (1) made of precipitation hardening copper having a width of 200 mm and a length of 900 mm as shown in FIG. 0.3 mm, bottom 0.6
After spraying a nickel-chromium self-fluxing alloy (4) with a thickness of mm and subjecting it to solution heat treatment and aging treatment, there was no thermal corrosion in the mold where the upper half of the nickel side surface was chromium plated (3) 20 μm Used 1800 charges.
＜発明の効果＞ 以上述べて来た如く、本発明による連続鋳造用鋳型は、
鋳型各部の実際の損傷度合を調査する事により開発され
たものであり、不必要な部所にはクロム層を設ける事な
く、資材的及び手間的なメリットがある事は勿論、その
結果として異種金属間で起こる局部電池による孔食とい
う問題も解決され、安定的に長期間使用出来るものであ
る。<Effects of the Invention> As described above, the continuous casting mold according to the present invention is
It was developed by investigating the actual degree of damage to each part of the mold, and there is a merit in terms of materials and labor without providing a chrome layer in unnecessary parts, and as a result, different types The problem of pitting corrosion caused by local batteries between metals is solved, and it can be stably used for a long period of time.
第１図〜第２図は、それぞれ本発明実施例の鋳型を示す
説明図。1 and 2 are explanatory views showing a mold according to an embodiment of the present invention.
Claims (2)
触面上に、ニッケルからなる第１層を設け、該第１層の
上面であって鋳型本体の上端から、同中央部よりはやゝ
下方部までに渡ってクロムからなる第２層を設けたこと
を特徴とする連続鋳造用鋳型。1. A first layer made of nickel is provided on the contact surface of a copper or copper alloy mold body with molten steel, and the upper surface of the first layer is from the upper end of the mold body to a position closer to the center than the upper part of the mold body. A continuous casting mold characterized in that a chrome second layer is provided up to the lower part.
触面上に、ニッケルからなる第１層を設け、該第１層の
下半分のニッケル表面にニッケル−クロム自溶性合金の
溶射層からなる第２層を設けると共に前記第１層の上半
分のニッケル表面にクロムからなる第２層を設けたこと
を特徴とする特許請求の範囲第１項記載の連続鋳造用鋳
型。2. A first layer made of nickel is provided on the contact surface of a copper or copper alloy mold body with molten steel, and a nickel-chromium self-fluxing alloy sprayed layer is provided on the nickel surface of the lower half of the first layer. The continuous casting mold according to claim 1, wherein a second layer made of Cr is provided and a second layer made of chromium is provided on the nickel surface of the upper half of the first layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61212938A JPH0659522B2 (en) | 1986-09-09 | 1986-09-09 | Mold for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61212938A JPH0659522B2 (en) | 1986-09-09 | 1986-09-09 | Mold for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6368247A JPS6368247A (en) | 1988-03-28 |
| JPH0659522B2 true JPH0659522B2 (en) | 1994-08-10 |
Family
ID=16630779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61212938A Expired - Lifetime JPH0659522B2 (en) | 1986-09-09 | 1986-09-09 | Mold for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0659522B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100951768B1 (en) | 2002-12-24 | 2010-04-08 | 재단법인 포항산업과학연구원 | Continuous casting mold for cooling |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5254622A (en) * | 1975-10-31 | 1977-05-04 | Sumitomo Metal Ind | Mould for continuous casting |
| JPS58221637A (en) * | 1982-06-16 | 1983-12-23 | Mishima Kosan Co Ltd | Casting mold for continuous casting |
| JPS60206552A (en) * | 1984-03-31 | 1985-10-18 | Nippon Steel Corp | Wide faced mold for continuous casting |
-
1986
- 1986-09-09 JP JP61212938A patent/JPH0659522B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6368247A (en) | 1988-03-28 |
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