JP2642570B2 - Heat- and wear-resistant cast slab support for continuous casting - Google Patents
Heat- and wear-resistant cast slab support for continuous castingInfo
- Publication number
- JP2642570B2 JP2642570B2 JP33851192A JP33851192A JP2642570B2 JP 2642570 B2 JP2642570 B2 JP 2642570B2 JP 33851192 A JP33851192 A JP 33851192A JP 33851192 A JP33851192 A JP 33851192A JP 2642570 B2 JP2642570 B2 JP 2642570B2
- Authority
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- Japan
- Prior art keywords
- weight
- heat
- wear
- continuous casting
- steel powder
- 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
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- Continuous Casting (AREA)
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は高温用耐摩耗材料に関す
る。詳しくは、耐熱クラック性、耐摩耗性に優れた焼結
合金材料による連続鋳造用鋳片支持部材に関するもので
ある。BACKGROUND OF THE INVENTION The present invention relates to high temperature wear resistant materials. More specifically, the present invention relates to a slab support member for continuous casting made of a sintered alloy material having excellent heat crack resistance and wear resistance.
【０００２】[0002]
【従来の技術】連続鋳造設備において鋳片冷却装置はモ
ールド直下にあり、モールドを通過した直後の鋳片を支
持するように位置されている。その摺動側には鋳片支持
部材が長片サイドと短片サイドに、それぞれ千鳥型に取
り付けられている。この鋳片支持部材の摺動面は１００
０〜１２００℃の鋳片と接触し、鋳片支持部材間に設け
られたスプレーノズルにより鋳片を水冷する構造になっ
ている。この鋳片支持部材の耐摩耗性を上げるために、
Ｎｉ−Ｃｒ系自溶性合金材料（特公平２−３７２５８）
が採られていた。具体的には、高硬度を得るために、鋳
鉄、構造用鋼、銅合金等の材質から成る鋳片支持部材の
表面にＮｉ−Ｃｒ系自溶性合金材料を溶射被覆の後、気
孔をなくすため９００〜１２００℃の温度範囲で加熱処
理により溶融後固化させていた。2. Description of the Related Art In a continuous casting facility, a slab cooling device is located immediately below a mold and is positioned to support a slab immediately after passing through the mold. On the sliding side, a slab supporting member is attached to the long side and the short side in a zigzag pattern. The sliding surface of this slab support member is 100
The slab is brought into contact with a slab at 0 to 1200 ° C., and the slab is water-cooled by a spray nozzle provided between the slab support members. In order to increase the wear resistance of this slab support member,
Ni-Cr based self-fluxing alloy material (Japanese Patent Publication No. 2-37258)
Was taken. Specifically, in order to obtain high hardness, cast iron, structural steel, the surface of a slab supporting member made of a material such as copper alloy, after spray coating Ni-Cr-based self-fluxing alloy material, to eliminate pores It was solidified after being melted by heat treatment in a temperature range of 900 to 1200 ° C.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このＮ
ｉ−Ｃｒ系自溶性合金は溶融固化され硬さを高めている
ために、耐摩耗性は高いものであるが、ほとんど靭性が
なく、加熱冷却の繰り返しによる熱サイクルを受ける鋳
片支持部材においては、その摺動面にクラックが発生し
やすかった。また、その鋳片支持部材のクラック内にフ
ラックスを巻き込み、鋳片に引っかききずをつくり、鋳
片の品質を低下させていた。本発明は上記の課題を解決
することを目的とする。However, this N
The i-Cr-based self-fluxing alloy has a high abrasion resistance because it is melt-solidified and has increased hardness, but has little toughness. , Cracks were easily generated on the sliding surface. Further, the flux is wound into the cracks of the slab supporting member, and scratches are formed on the slab, thereby deteriorating the quality of the slab. An object of the present invention is to solve the above problems.
【０００４】[0004]
【課題を解決するための手段】前記の課題を達成するた
め本発明の要旨とするところは次の通りである。 （１）Ｃ０．５〜１．５重量％、Ｃｒ３〜１５重量％、
Ｎｉmax ２重量％、Ｍｏmax ２重量％、Ｖmax １重量
％、Ｓｉ０．２〜０．８重量％、Ｍｎ０．２〜１．５重
量％を基本成分に、残部が不可避不純物からなるクロム
鋼粉に、オーステナイト系ステンレス鋼粉を、重量比で
５〜５０％混合した合金を熱間等方圧加圧成形（ＨＩ
Ｐ）処理により焼結させたことを特徴とする耐熱クラッ
ク性を付与した連続鋳造用耐熱耐摩耗鋳片支持部材。 （２）ＨＩＰによる焼結合金に、熱間塑性加工を施した
ことを特徴とする耐熱クラック性を付与した上記（１）
に記載の連続鋳造用耐熱耐摩耗鋳片支持部材。The gist of the present invention to achieve the above object is as follows. (1) 0.5 to 1.5% by weight of C, 3 to 15% by weight of Cr,
Nimax 2% by weight, Momax 2% by weight, Vmax 1% by weight, Si 0.2 to 0.8% by weight, Mn 0.2 to 1.5% by weight as a basic component, and the balance being chromium steel powder composed of unavoidable impurities, Hot isostatic pressing of an alloy in which austenitic stainless steel powder is mixed at a weight ratio of 5 to 50% (HI
P) A heat-resistant and wear-resistant cast slab support member for continuous casting provided with heat crack resistance, characterized by being sintered by a treatment. (2) The above-mentioned (1) in which a heat-resistant cracking property characterized by being subjected to hot plastic working on a sintered alloy by HIP.
2. A heat- and wear-resistant cast slab support member for continuous casting according to item 1.
【０００５】[0005]
【作用】本発明の達成にあたり、耐摩耗性を保持するた
めのクロム鋼粉については以下の点を考慮して最適成分
範囲を定めた。Ｃについては０．５重量％以下では耐摩
耗性が劣り、また、１．５重量％以上になると、逆に耐
摩耗性は良くなるものの靭性が低下し脆化しやすくなる
ので、適正範囲を０．５〜１．５重量％に設定した。In order to achieve the present invention, the optimum range of chromium steel powder for maintaining the wear resistance was determined in consideration of the following points. When C is less than 0.5% by weight, the wear resistance is inferior. When it is more than 1.5% by weight, on the contrary, although the wear resistance is improved, the toughness is lowered and the material is easily embrittled. 0.5 to 1.5% by weight.
【０００６】Ｃｒについては３重量％以下になると耐食
性が劣り、逆に１５重量％以上になると耐熱クラック性
が悪くなってくるので、適正範囲を３〜１５重量％に設
定した。When the content of Cr is less than 3% by weight, the corrosion resistance is inferior. On the other hand, when the content is more than 15% by weight, the heat cracking resistance is deteriorated. Therefore, the appropriate range is set to 3 to 15% by weight.
【０００７】Ｓｉについては０．２重量％以下では結晶
粒が細粒化しにくく、逆に０．８重量％以上になると靭
性が急激に低下し脆化しやすくなってくるので、適正範
囲を０．２〜０．８重量％に設定した。[0007] When Si is less than 0.2% by weight, the crystal grains are hard to be refined. On the other hand, when it is more than 0.8% by weight, the toughness is rapidly reduced and the brittleness is liable to be embrittled. It was set to 2-0.8% by weight.
【０００８】Ｍｎについては靭性の向上に役立つが０．
２重量％以下では基地の強化がなく、また１．５重量％
以上では酸化しやすくなってくるので、適正範囲を０．
２〜１．５重量％に設定した。[0008] Mn is useful for improving the toughness.
At less than 2% by weight, the base is not strengthened and 1.5% by weight
Above, oxidation becomes easy, so the appropriate range is set to 0.1.
It was set to 2-1.5% by weight.
【０００９】その他、Ｎｉ，Ｍｏ，Ｖ等は基地の強化、
とくに靭性を向上させるためにＮｉは max３重量％、Ｍ
ｏは max２重量％、Ｖは max１重量％にそれぞれ設定し
た。なお残部は不可避不純物および鉄を成分とするクロ
ムである。[0009] In addition, Ni, Mo, V, etc.
In particular, in order to improve toughness, Ni is max.
o was set to 2% by weight and V was set to 1% by weight. The balance is chromium containing inevitable impurities and iron.
【００１０】[0010]
【実施例】本発明は、以上のクロム鋼粉を用いて、その
クロム鋼粉に、高靭性を有するオーステナイト系ステン
レス鋼粉を混合してＨＩＰ処理、さらには、それに熱間
塑性加工を加えることによって得た焼結合金によって、
この目的を達成した。以下、本発明の実施例を比較例と
共に示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to the use of the above chromium steel powder, mixing of the chromium steel powder with an austenitic stainless steel powder having high toughness, HIP treatment, and further subjecting it to hot plastic working. By the sintered alloy obtained by
This objective has been achieved. Hereinafter, Examples of the present invention are shown together with Comparative Examples.
【００１１】実施例１ 加熱冷却雰囲気における本発明の実施例を以下に示す。
本発明のクロム鋼粉（２５０μｍ以下）は、耐摩耗性は
有しているものの靭性がないために、靭性の有るオース
テナイト系ステンレス鋼粉（ＳＵＳ３０４：２５０μｍ
以下：Ｈｖ１８０）を、５％，１０％，２０％，３０
％，４０％，５０％，６０％および８０重量％混合した
複合粉、およびクロム鋼粉１００重量％の単一粉を、そ
れぞれ別のカプセルに充填した後、真空脱気（１×１０
-5Torr）し、ＨＩＰ処理（１２５０℃、１８０MPa 、保
定３hr）により、これらの粉末を焼結させた。さらに
は、鍛造（９００〜１２００℃）により、熱間加工を施
した。Embodiment 1 An embodiment of the present invention in a heating and cooling atmosphere will be described below.
The chromium steel powder (250 μm or less) of the present invention has abrasion resistance but no toughness, and therefore has a tough austenitic stainless steel powder (SUS304: 250 μm).
The following: Hv180) is 5%, 10%, 20%, 30
%, 40%, 50%, 60% and 80% by weight of a composite powder and a single powder of 100% by weight of chromium steel powder were filled in separate capsules, and then vacuum degassed (1 × 10
-5 Torr) and, HIP treatment (1250 ℃, 180MPa, the retention 3 hr), and sintered these powders. Further, hot working was performed by forging (900 to 1200 ° C.).
【００１２】このようにして得られた焼結合金の耐熱ク
ラック性を図１に示す。試験の方法はφ７０×２５mmｔ
の形状に加工した試験片を、１０００℃に加熱したもの
を３００℃まで水冷するヒートクラックテストにより、
クラックの発生に至るまでの熱サイクルの回数で評価し
た。FIG. 1 shows the thermal crack resistance of the thus obtained sintered alloy. Test method is φ70 × 25mmt
The test piece processed into the shape of the above was heated to 1000 ° C., and the water was cooled to 300 ° C. by a heat crack test.
The evaluation was made based on the number of thermal cycles until cracks were generated.
【００１３】比較材である従来、使用されていたＮｉ−
Ｃｒ系の自溶性合金は、５０回目でクラックが発生し
た。これに比べ、本発明のクロム鋼粉とオーステナイト
系ステンレス鋼粉の混合による焼結合金は、クロム鋼粉
に５重量％以上のオーステナイト系ステンレス鋼粉を混
合した焼結合金が、従来材より優れ、５０回以上の耐熱
クラック性を有していた。中でもオーステナイト系ステ
ンレス鋼粉を３０および４０重量％混合したものが、と
くに耐熱クラック性が優れていた。この混合量において
ＨＩＰ処理だけのものは、９０回目でクラックが発生
し、従来材の１．４倍の耐久性が認められた。さらに、
ＨＩＰ処理材に鍛造を加えたものは、２５０回目でクラ
ックが発生し、従来材の５倍の耐久性が認められた。な
お、オーステナイト系ステンレス鋼粉を５０重量％以上
混合したものは硬さが急激に低下し耐摩耗性が劣る。し
たがって前記オーステナイト系ステンレス鋼粉を混合す
る上限は５０重量％が好ましい。[0013] The comparative material Ni-
Cr-based self-fluxing alloys cracked 50 times. On the other hand, the sintered alloy of the present invention obtained by mixing the chromium steel powder and the austenitic stainless steel powder is superior to the conventional alloy in that the sintered alloy obtained by mixing the chromium steel powder and the austenitic stainless steel powder of 5% by weight or more is mixed. , 50 times or more. Among them, a mixture of 30% and 40% by weight of austenitic stainless steel powder was particularly excellent in heat crack resistance. In the case of the HIP treatment alone at this mixing amount, cracks occurred at the 90th time, and the durability was 1.4 times that of the conventional material. further,
Cracking occurred in the 250th run of the forged HIP-treated material, and durability five times that of the conventional material was recognized. It should be noted that those containing 50% by weight or more of austenitic stainless steel powder have a sharp decrease in hardness and poor wear resistance. Therefore, the upper limit for mixing the austenitic stainless steel powder is preferably 50% by weight.
【００１４】つぎに、クロム鋼粉７０重量％にオーステ
ナイト系ステンレス鋼粉を３０重量％混合したＨＩＰ処
理材に鍛造を施したものを、鋳片支持部材に機械加工
し、実機で評価した。その結果、従来材は３００チャー
ジで、摺動面にクラックが発生し廃棄になった。これに
比べ、本発明は９８０チャージで廃棄になったが、従来
材より約３倍の耐久性を有していた。以上、本発明のも
のは、オーステナイト系ステンレス鋼で靭性を付与して
いるので、従来のものに比べて耐熱クラック性が大幅に
改善された。Next, a forged HIP material obtained by mixing 30% by weight of austenitic stainless steel powder with 70% by weight of chromium steel powder was machined into a slab support member, and evaluated by a real machine. As a result, the conventional material had 300 charges, cracks occurred on the sliding surface, and were discarded. In comparison, the present invention was discarded after 980 charges, but had about three times the durability of the conventional material. As described above, since the austenitic stainless steel of the present invention imparts toughness, the heat crack resistance is significantly improved as compared with the conventional one.
【００１５】[0015]
【発明の効果】本発明のクロム鋼系の焼結合金は、マト
リックスとなる基地にオーステナイト系ステンレス鋼を
分散させているので、以下の効果がある。まず、マトリ
ックスとなる単一組成材に靭性を付与しているので、加
熱冷却の熱サイクルを受けても、従来材に比べ、熱クラ
ックが発生しにくくなった。また、従来材は９００℃以
上になると、急激に軟化してくるが、従来材より耐熱性
に優れている。さらには、１０００℃においても、高温
硬さを高く維持できるので、高温摩耗にも優れている。
つぎに、連続鋳造の鋳片冷却装置の鋳片支持部材におい
て、その摺動面で受ける繰り返しの加熱冷却による熱ク
ラックが生じにくくなり、この熱クラックの減少にとも
ない、摺動面へのスラグ巻き込みも減少し、鋳片の品質
が良くなってきた。The chromium steel-based sintered alloy of the present invention has the following effects because austenitic stainless steel is dispersed in a matrix serving as a matrix. First, since the toughness is imparted to the single composition material serving as the matrix, even when subjected to a heat cycle of heating and cooling, thermal cracks are less likely to occur than in the conventional material. Further, the conventional material rapidly softens at 900 ° C. or higher, but has better heat resistance than the conventional material. Furthermore, even at 1000 ° C., the high-temperature hardness can be maintained at a high level, so that it is excellent in high-temperature wear.
Next, in the slab support member of the slab cooling device for continuous casting, thermal cracks due to repeated heating and cooling received on the sliding surface are less likely to occur, and with the reduction of the thermal cracks, slag entrainment on the sliding surface. And the quality of the slab has improved.
【図１】本願発明クロム系焼結合金の耐熱クラック性を
示す図である。FIG. 1 is a diagram showing the heat crack resistance of a chromium-based sintered alloy of the present invention.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２２Ｃ 38/30 Ｃ２２Ｃ 38/30 (72)発明者 西 泰宏 福岡県北九州市戸畑区飛幡町１番１号 新日本製鐵株式会社 八幡製鐵所内──────────────────────────────────────────────────続 き Continuing on the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location C22C 38/30 C22C 38/30 (72) Inventor Yasuhiro Nishi No. 1 Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture No. 1 Nippon Steel Corporation Yawata Works
Claims (2)
重量％、Ｎｉmax ２重量％、Ｍｏmax ２重量％、Ｖmax
１重量％、Ｓｉ０．２〜０．８重量％、Ｍｎ０．２〜
１．５重量％を基本成分に、残部が不可避不純物からな
るクロム鋼粉に、オーステナイト系ステンレス鋼粉を、
重量比で５〜５０％混合した合金を熱間等方圧加圧成形
（ＨＩＰ）処理により焼結させたことを特徴とする耐熱
クラック性を付与した連続鋳造用耐熱耐摩耗鋳片支持部
材。1. 0.5 to 1.5% by weight of C, 3 to 15% of Cr
Wt%, Nimax 2 wt%, Momax 2 wt%, Vmax
1% by weight, Si 0.2 to 0.8% by weight, Mn 0.2 to
Austenitic stainless steel powder is added to chromium steel powder consisting of 1.5% by weight as a basic component and the balance being unavoidable impurities.
A heat- and wear-resistant cast slab support member for continuous casting imparted with heat crack resistance, characterized by sintering an alloy mixed at a weight ratio of 5 to 50% by hot isostatic pressing (HIP).
を施したことを特徴とする耐熱クラック性を付与した請
求項１に記載の連続鋳造用耐熱耐摩耗鋳片支持部材。2. The heat-resistant and wear-resistant cast slab support member for continuous casting according to claim 1, wherein a heat-resistant cracking property is provided to the sintered alloy by HIP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33851192A JP2642570B2 (en) | 1992-12-18 | 1992-12-18 | Heat- and wear-resistant cast slab support for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33851192A JP2642570B2 (en) | 1992-12-18 | 1992-12-18 | Heat- and wear-resistant cast slab support for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06184603A JPH06184603A (en) | 1994-07-05 |
| JP2642570B2 true JP2642570B2 (en) | 1997-08-20 |
Family
ID=18318848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33851192A Expired - Lifetime JP2642570B2 (en) | 1992-12-18 | 1992-12-18 | Heat- and wear-resistant cast slab support for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2642570B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9624999D0 (en) * | 1996-11-30 | 1997-01-15 | Brico Eng | Iron-based powder |
-
1992
- 1992-12-18 JP JP33851192A patent/JP2642570B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06184603A (en) | 1994-07-05 |
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