JPH078366B2 - Welding roll for hot rolling - Google Patents
Welding roll for hot rollingInfo
- Publication number
- JPH078366B2 JPH078366B2 JP23675586A JP23675586A JPH078366B2 JP H078366 B2 JPH078366 B2 JP H078366B2 JP 23675586 A JP23675586 A JP 23675586A JP 23675586 A JP23675586 A JP 23675586A JP H078366 B2 JPH078366 B2 JP H078366B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- roll
- overlay
- welding
- core material
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は安価で靭性を有する鋼材によるロール芯部と、
ロール使用層にプラズマ粉体肉盛溶接による、硬質炭化
物含有の肉盛層を備えた熱間圧延用溶接肉盛ロールに関
する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a roll core made of a steel material which is inexpensive and has toughness,
The present invention relates to a weld overlay roll for hot rolling, which has a hard carbide-containing overlay layer formed by plasma powder overlay welding on a roll-use layer.
（従来の技術） 熱間圧延用ロールは一般に耐摩耗性、耐クラック性（靭
性）があって肌荒れやヒートクラックの発生し難い材質
が要求され、従来ロールには例えば合金チルドロール、
高合金グレンロール、アダマイトロールなどの単体ロー
ルや、高クロム鋳鉄、高合金グレン、アダマイトなどを
外層とする複合ロールが使用されている。(Prior Art) Rolls for hot rolling are generally required to have materials having abrasion resistance and crack resistance (toughness) and which are unlikely to cause rough skin and heat cracks. Conventional rolls include, for example, alloy chilled rolls,
Single rolls such as high alloy grain rolls and adamite rolls, and composite rolls having high chromium cast iron, high alloy grain, adamite and the like as outer layers are used.
（発明が解決しようとする問題点） 熱間圧延用ロールとしての必要特性を兼備させるべく、
上記材質には各種成分が配合されているが、各必要特性
を十分に兼備させることは困難であり、一般に耐摩耗性
に優れるものは靭性に劣り、ヒートクラックも発生しや
すい。しかも単体ロールの場合は高価な材料をロール全
体に使用するのも問題である。(Problems to be solved by the invention) In order to combine the necessary characteristics as a roll for hot rolling,
Although various components are blended in the above-mentioned material, it is difficult to make each required property fully possessed, and generally, those having excellent wear resistance are inferior in toughness, and heat cracks are likely to occur. Moreover, in the case of a single roll, it is a problem to use an expensive material for the whole roll.
一方、複合ロールにおいては、使用層である外層と、芯
部材はそれぞれ必要特性を強調した材質とすることがで
き、しかも外層のみが通常高価な材質であるという利点
があるが、高コストの遠心力鋳造に依らねばならぬ点が
やはり問題である。On the other hand, in the composite roll, the outer layer, which is the used layer, and the core member can be made of materials emphasizing the required characteristics, respectively, and there is an advantage that only the outer layer is usually an expensive material. The problem is that we have to rely on force casting.
また単体、複合いずれにしても耐事故性の面からの靭性
確保が必要であり、従って自から組織の制約があって飛
躍的耐摩耗性の向上は望めなかった。In addition, it is necessary to secure the toughness from the standpoint of accident resistance, either as a single substance or as a composite component. Therefore, it was impossible to expect a dramatic improvement in wear resistance due to self-structural restrictions.
（問題点を解決するための手段） 本発明は叙上のような問題点を解決する目的を以ってな
されたものであり、従ってその特徴的手段とするところ
は、 靭性を有する鋼材によるロール芯材の外周に、重量百分
率で、C:2.0〜3.5％、Cr:20〜30％、残部Fe及び通常の
合金元素並びに不可避的不純物から成るFe系合金の粉末
を重量百分率で60〜80％含み、残部VC若しくはNbCの粉
末から成る混合粉末を、プラズマ粉体肉盛溶接により形
成した肉盛層を備えしめた点にある。(Means for Solving Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and therefore, a characteristic means thereof is a roll made of a steel material having toughness. Percentage of C: 2.0-3.5%, Cr: 20-30%, balance Fe and Fe-based alloy powder consisting of usual alloying elements and unavoidable impurities in weight percentage of 60-80% around the periphery of the core material. This is a point in which a build-up layer formed by plasma powder build-up welding was provided with a mixed powder containing the balance VC or NbC powder.
（実施例） 以下図面を参照しつゝ実施例について説明する。(Embodiment) An embodiment will be described below with reference to the drawings.
第１図は本発明の一実施例ロールの一部断面図であり、
１がプラズマ粉体肉盛溶接による肉盛層、２が芯材（母
材）である。FIG. 1 is a partial sectional view of a roll according to an embodiment of the present invention,
Reference numeral 1 is a overlay layer formed by plasma powder overlay welding, and 2 is a core material (base material).
上記芯材２は靭性を有する鋼材、たとえばSCM440材の如
き通常の安価な鋼材の使用が可能であり、同芯材２を母
材として、該母材胴部外周にNbCやVCなどの硬質で、か
つ溶接肉盛金属中に微細な球状炭化物として析出する炭
化物粉末と、Fe系高Cr材粉末との混合粉末による溶接肉
盛層２、すなわち微細な炭化物を均一に析出させた極め
て緻密な組織を有する急冷凝固層を形成せしめたもので
あり、上記肉盛用粉末の成分、組成の限定は次のような
理由に依るものである。The core material 2 can be a steel material having toughness, for example, an ordinary inexpensive steel material such as SCM440 material. The core material 2 is used as a base material and is made of a hard material such as NbC or VC on the outer periphery of the base material body. And a weld overlay 2 made of a mixed powder of carbide powder that is precipitated as fine spherical carbide in the weld overlay metal and Fe-based high Cr material powder, that is, a very dense structure in which fine carbide is uniformly deposited. And the components and compositions of the above-mentioned build-up powder are limited because of the following reasons.
C:2.0〜3.5％ Ｃは炭化物を形成するための元素であるが、2.0％未満
では炭化物の生成量が少なく、従って耐摩耗性が不足す
る。一方3.5％を越えると炭化物量が過多となって靭が
劣るようになるのである。C: 2.0 to 3.5% C is an element for forming carbides, but if it is less than 2.0%, the amount of carbides formed is small, and therefore wear resistance is insufficient. On the other hand, if it exceeds 3.5%, the carbide content becomes excessive and the toughness becomes poor.
Cr:20〜30％ Crは炭化物形成元素であり、耐摩耗性を増す。又基地中
に固溶して耐熱性、耐食性を増大させる。Cr: 20-30% Cr is a carbide forming element and increases wear resistance. It also forms a solid solution in the matrix to increase heat resistance and corrosion resistance.
しかし、その含有量が20％未満では上記効果が少なく、
一方30％を越えると材質を脆くするのである。However, if the content is less than 20%, the above effect is small,
On the other hand, if it exceeds 30%, the material becomes brittle.
次に上記成分、組成を有するFe系高Cr材粉末と混合され
るVCまたはNbC粉末について述べると、記述のようにこ
れらは硬質炭化物であり、溶接盛肉の金属組織中に微細
な球状炭化物として析出する。一般に炭化物の増加は耐
摩耗性の向上に寄与するが、該炭化物が粗大組織として
現われる場合は疲労亀裂を生じやすい。Next, the VC or NbC powder mixed with the Fe-based high Cr material powder having the above components and composition will be described.These are hard carbides as described, and as fine spherical carbides in the metal structure of the weld fill. To deposit. Generally, an increase in carbide contributes to improvement in wear resistance, but when the carbide appears as a coarse structure, fatigue cracking is likely to occur.
ところが上述のようにVCやNbCは微細な球状で析出する
から耐摩耗性、耐クラック性の付与と共に耐肌荒性にも
好影響を及ぼすのである。However, as described above, since VC and NbC are precipitated in the form of fine spheres, wear resistance and crack resistance are imparted, and the rough surface resistance is also adversely affected.
しかして、混合粉末中におけるこれら硬質炭化物粉末の
含有量を20〜40重量％（Fe系高Cr材粉末が60〜80重量
％）と限定したのは、上記耐摩耗性、耐クラック性の良
好な範囲として規定したのである。However, the reason why the content of these hard carbide powders in the mixed powder is limited to 20 to 40% by weight (60 to 80% by weight of Fe-based high Cr material powder) is that the wear resistance and crack resistance are good. It was defined as a range.
なお粉末粒子の粒度は100〜250メッシュが好ましい。The particle size of the powder particles is preferably 100 to 250 mesh.
以上のようにして調整された混合粉末によるプラズマ粉
体肉盛溶接は、公知の方法によることができ、その概要
を第２図の説明図に示した。The plasma powder overlay welding using the mixed powder prepared as described above can be carried out by a known method, the outline of which is shown in the explanatory view of FIG.
同図において、３はプラズマアーク溶接トーチであり、
２が芯材（母材）である。In the figure, 3 is a plasma arc welding torch,
2 is a core material (base material).
４はタングステン電極、５は冷却水６で冷却されるジャ
ケット構造の銅電極で、溶接開始に当ってのパイロット
アークを、前記タングステン電極４との間に発生させる
ための電極である。この銅電極５の外側を外筒７が取り
巻き、銅電極５と外筒７の間に導入された混合粉末８
は、プラズマガス９により形成されかつタングステン電
極４と母材２間をとぶプラズマアークによって母材２上
に溶接金属を形成し、肉盛層１を形成するのである。Reference numeral 4 is a tungsten electrode, 5 is a copper electrode having a jacket structure that is cooled by cooling water 6, and is an electrode for generating a pilot arc between the tungsten electrode 4 and the start of welding. The outer cylinder 7 surrounds the outside of the copper electrode 5, and the mixed powder 8 introduced between the copper electrode 5 and the outer cylinder 7.
Is to form a weld metal on the base material 2 by the plasma arc which is formed by the plasma gas 9 and blows between the tungsten electrode 4 and the base material 2 to form the overlay layer 1.
なお、10はプラズマアークの外側をシールドするシール
ドガスノズルであり、11がシールドガスである。In addition, 10 is a shield gas nozzle that shields the outside of the plasma arc, and 11 is a shield gas.
かくして、優れた耐摩耗性と靭性を有しかつ安価な熱間
圧延用ロールが得られるのである。Thus, an inexpensive hot rolling roll having excellent wear resistance and toughness can be obtained.
なお芯材に替えて鋼管を母材とし、同母材外周上に前記
肉盛層を備えたスリーブを、鋼芯材に焼嵌めしたロール
も本発明の範疇に入るものであり、第３〜５図にこれら
のロールを例示した。A roll in which a steel pipe is used as a base material instead of the core material, and a sleeve provided with the overlay layer on the outer periphery of the base material is shrink-fitted to the steel core material is also included in the scope of the present invention. These rolls are illustrated in FIG.
すなわち第３図は芯材胴部全長に亘るスリーブを焼嵌め
したロール、第４図は芯材が軸芯材であり同軸芯材に分
割型スリーブを相接して焼嵌めしたロール、第５図は軸
芯材に間隔を置いてスリーブを焼嵌めしたロールであ
り、スリーブ数は図示のように３個と限られるべきでな
い。なお第３〜５図において１がプラズマ粉体肉盛溶接
による肉盛層であり、2aが母材鋼管で、２が芯材であ
る。なお母材鋼管は靭性を有する通常鋼材によることが
できる。That is, FIG. 3 is a roll in which a sleeve over the entire length of a core material is shrink-fitted, FIG. 4 is a roll in which a core material is a shaft core material, and a split type sleeve is abutted on a coaxial core material, and is fitted in a roll. The figure shows a roll in which sleeves are shrink-fitted at intervals on the shaft core, and the number of sleeves should not be limited to three as shown. In FIGS. 3 to 5, 1 is a build-up layer formed by plasma powder build-up welding, 2a is a base steel pipe, and 2 is a core material. The base steel pipe may be a normal steel material having toughness.
次に本発明の具体的実施例を示す。Next, specific examples of the present invention will be shown.
a.混合粉末 Fe系高Cr材粉末 粒度及び含有量……100〜250メッシュ、70wt％ 成分……C:3.0％,Si:0.3％,Mn:0.4％,Ni:0.5％,Cr:27
％,Mo:0.1％残部実質的にFe 硬質炭化物粉末 粒度及び含有量……100〜250メッシュ、30wt％ 成分……VC b.ロール サイズ……φ300×500l（胴部） 芯材（母材）……SCM440 肉盛厚……6mm 上記実施例の肉盛層表面から内部へかけて硬度を調査し
た結果を第６図に示す。肉盛層の硬度はHRC65〜68で優
れた硬さを示している。a. Mixed powder Fe-based high Cr material powder Particle size and content …… 100 to 250 mesh, 70wt% Component …… C: 3.0%, Si: 0.3%, Mn: 0.4%, Ni: 0.5%, Cr: 27
%, Mo: 0.1% Remaining substantially Fe hard carbide powder Particle size and content …… 100-250 mesh, 30wt% Composition …… VC b. Roll size …… φ300 × 500l (body) Core material (base material) …… SCM440 Overlay thickness …… 6mm Fig. 6 shows the result of investigation of hardness from the surface of the overlay layer to the inside of the above example. The hardness of the overlay is H R C65 to 68, which indicates excellent hardness.
又、同肉盛層の金属顕微鏡組織写真（×400）を第８図
として示した。Further, a metallographic structure photograph (× 400) of the same overlay layer is shown in FIG.
a.混合粉末 Fe系高Cr材粉末 粒度及び含有量……100〜250メッシュ、70wt％ 成分……C:3.0％,Si:0.3％,Mn:0.4％,Ni:0.5％,Cr:27
％,Mo:0.1％残部実質的にFe 硬質炭化物粉末 粒度及び含有量……100〜250メッシュ、30wt％ 成分……NbC b.ロール サイズ……φ300×500l（胴部） 芯材（母材）……SCM440 肉盛厚……6mm 上記実施例の肉盛層表面から内部へかけて硬度を調査し
た結果を第７図に示す。肉盛層の硬度はHRC61〜63で優
れた硬さである。a. Mixed powder Fe-based high Cr material powder Particle size and content …… 100 to 250 mesh, 70wt% Component …… C: 3.0%, Si: 0.3%, Mn: 0.4%, Ni: 0.5%, Cr: 27
%, Mo: 0.1% Remaining substantially Fe hard carbide powder Particle size and content …… 100-250 mesh, 30wt% Composition …… NbC b. Roll size …… φ300 × 500l (body) Core material (base material) …… SCM440 Overlay thickness …… 6mm Fig. 7 shows the result of investigation of hardness from the surface of the overlay layer to the inside of the above example. The hardness of the cladding layer is a hardness excellent in H R C61~63.
又、同肉盛層の金属顕微鏡組織写真（×400）を第９図
として示した。Also, a metallographic structure photograph (× 400) of the same overlay is shown in FIG.
次に上記に示した実施例粉末（VC粉末混合）による溶
接肉盛金属と、従来高クロム系肉盛材の高温硬度を調査
比較した結果を第10図として示す。本発明実施例の優れ
ることが明らかであり、NbC粉末混合の場合も同様であ
った。Next, FIG. 10 shows the results of the investigation and comparison of the high temperature hardness of the weld overlay metal with the example powder (VC powder mixture) shown above and the conventional high chromium overlay material. It was clear that the examples of the present invention were excellent, and the same was true when NbC powder was mixed.
又、上記、の実施例に用いた混合粉末による溶接肉
盛金属と、従来高クロム系肉盛材による溶接肉盛金属の
圧縮強さは、それぞれ340〜360kgf/mm2、280〜300kgf/m
m2であった。Further, the above-mentioned weld overlay metal with the mixed powder used in the examples, and the compressive strength of the overlay weld metal with the conventional high chromium overlay material are 340 to 360 kgf / mm 2 and 280 to 300 kgf / m, respectively.
It was m 2 .
なお、上述の比較に用いた従来高クロム系肉盛材の組成
は次のようである。The composition of the conventional high chromium-based overlay material used for the above comparison is as follows.
C:2.6％,Si:0.8％,Mn:0.8％,Cr:18.0％ （発明の効果） 本発明は以下のとおりであり、芯材は靭性を有する鋼
材、すなわち通常の鋼材から選び得る材質で、従って安
価に製造することができる。しかも該芯材は鋳鋼品、鍜
鋼品のいずれとすることも可能であるが、具体的実施例
に示したように熱間鍜造品とすれば、従来の鋳造品に比
して極めて優れた靭性を有する芯材を得ることができ
る。そして同芯材外周上に、或いは同芯材に焼嵌めされ
るスリーブ上に、ロール使用層として形成された溶接肉
盛層は、高Ｃ、高Cr含有のFe系合金粉末とVC若しくはNb
C粉末の混合粉末をプラズマ粉体溶接によって形成した
急冷凝固の肉盛層であるから、微細炭化物を均一に析出
した緻密組織を有して、耐摩耗性、耐熱性、耐食性、更
には耐肌荒性にも優れるのである。つまり本発明ロール
は優れた靭性（耐クラック性）と共に、優れた耐摩耗性
を兼備すると共にその他の熱間圧延用ロールとしての特
性にも優れ、しかも安価に製造できるものであり、その
工業的価値は著大である。C: 2.6%, Si: 0.8%, Mn: 0.8%, Cr: 18.0% (Effect of the invention) The present invention is as follows, and the core material is a steel material having toughness, that is, a material that can be selected from ordinary steel materials. Therefore, it can be manufactured at low cost. Moreover, the core material can be either a cast steel product or a wrought steel product, but if a hot-worked product is used as shown in the concrete examples, it is extremely superior to a conventional cast product. A core material having excellent toughness can be obtained. The weld overlay that is formed as a roll-use layer on the outer circumference of the concentric material or on the sleeve that is shrink-fitted to the concentric material is composed of Fe-based alloy powder containing high C and high Cr and VC or Nb.
Since it is a hardened layer of rapid solidification formed by plasma powder welding of a mixed powder of C powder, it has a dense structure in which fine carbide is uniformly deposited, and has wear resistance, heat resistance, corrosion resistance, and even skin resistance. It is also excellent in roughness. That is, the roll of the present invention has excellent toughness (crack resistance), excellent wear resistance, excellent properties as other hot rolling rolls, and can be manufactured at low cost. The value is enormous.
第１図は本発明の一実施例ロールの一部断面図、第２図
はプラズマ粉体肉盛溶接の説明図、第３図〜第５図は他
の実施例の一部断面図で、溶接肉盛されたスリーブを芯
材に焼嵌めしたロール例である。 第６図及び第７図は本発明実施例の溶接肉盛層表面から
芯材内部への各深さにおける硬度を示すグラフ。第８図
及び第９図は本発明実施例の溶接肉盛層の金属組織顕微
鏡写真。第10図は本発明実施例粉末による溶接肉盛金属
と従来高クロム系肉材の高温硬度を比較したグラフであ
る。 １……肉盛層、２……芯材、2a……鋼管、３……プラズ
マアーク溶接トーチ、４……タングステン電極、５……
銅電極、６……外筒、７……混合粉末。FIG. 1 is a partial cross-sectional view of a roll of an embodiment of the present invention, FIG. 2 is an explanatory view of plasma powder overlay welding, and FIGS. 3 to 5 are partial cross-sectional views of other embodiments. It is an example of a roll obtained by shrink-fitting a welded sleeve onto a core material. FIG. 6 and FIG. 7 are graphs showing the hardness at each depth from the surface of the weld overlay to the inside of the core material in the embodiment of the present invention. FIG. 8 and FIG. 9 are micrographs of the metallographic structure of the weld overlay of the example of the present invention. FIG. 10 is a graph comparing the high temperature hardness of the weld overlay metal made of the powder of Example of the present invention and the conventional high chromium type meat material. 1 ... overlay layer, 2 core material, 2a steel tube, 3 plasma arc welding torch, 4 tungsten electrode, 5
Copper electrode, 6 ... Outer cylinder, 7 ... Mixed powder.
Claims (3)
に、重量百分率で、C:2.0〜3.5％、Cr:20〜30％、残部F
e及び通常の合金元素並びに不可避的不純物から成るFe
系合金の粉末を重量百分率で60〜80％含み、残部VC若し
くはNbCの粉末から成る混合粉末を、プラズマ粉体肉盛
溶接により形成した肉盛層を備えていることを特徴とす
る熱間圧延用溶接肉盛ロール。1. A weight percentage of C: 2.0 to 3.5%, Cr: 20 to 30%, balance F on the outer periphery of a roll core material made of a steel material having toughness.
Fe consisting of e and usual alloying elements and inevitable impurities
Hot-rolling, characterized in that it contains 60-80% by weight of a powder of a system alloy, and a mixed powder consisting of the balance VC or NbC powder is provided with a build-up layer formed by plasma powder build-up welding. Weld overlay rolls.
プラズマ粉体肉盛溶接して形成されていることを特徴と
する特許請求の範囲第１項記載の熱間圧延用溶接肉盛ロ
ール。2. The welded meat for hot rolling according to claim 1, wherein the build-up layer is formed by plasma powder build-up welding using the roll core material as a base material. Mori roll.
めしたスリーブを母材としてプラズマ粉体肉盛溶接して
形成されていることを特徴とする特許請求の範囲第１項
記載の熱間圧延用溶接肉盛ロール。3. The overlay layer is formed by plasma powder overlay welding using a sleeve shrink-fitted to the outer periphery of the roll core material as a base material. Welding roll for hot rolling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23675586A JPH078366B2 (en) | 1986-10-03 | 1986-10-03 | Welding roll for hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23675586A JPH078366B2 (en) | 1986-10-03 | 1986-10-03 | Welding roll for hot rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6390307A JPS6390307A (en) | 1988-04-21 |
| JPH078366B2 true JPH078366B2 (en) | 1995-02-01 |
Family
ID=17005309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23675586A Expired - Lifetime JPH078366B2 (en) | 1986-10-03 | 1986-10-03 | Welding roll for hot rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH078366B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5647920A (en) * | 1989-12-27 | 1997-07-15 | Toshiba Kikai Kabushiki Kaisha | Process for preparation of corrosion-resistant and wear-resistant alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5543068B2 (en) | 2004-12-30 | 2014-07-09 | スリーエム イノベイティブ プロパティズ カンパニー | Chiral fused [1,2] imidazo [4,5-c] cyclic compound |
-
1986
- 1986-10-03 JP JP23675586A patent/JPH078366B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5543068B2 (en) | 2004-12-30 | 2014-07-09 | スリーエム イノベイティブ プロパティズ カンパニー | Chiral fused [1,2] imidazo [4,5-c] cyclic compound |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6390307A (en) | 1988-04-21 |
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