JPS63210255A - Outer layer material for duplex roll - Google Patents
Outer layer material for duplex rollInfo
- Publication number
- JPS63210255A JPS63210255A JP4145887A JP4145887A JPS63210255A JP S63210255 A JPS63210255 A JP S63210255A JP 4145887 A JP4145887 A JP 4145887A JP 4145887 A JP4145887 A JP 4145887A JP S63210255 A JPS63210255 A JP S63210255A
- Authority
- JP
- Japan
- Prior art keywords
- outer layer
- layer material
- carbide
- roll
- centrifugal 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- 238000005299 abrasion Methods 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 238000007788 roughening Methods 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
- 150000001247 metal acetylides Chemical class 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 229910001563 bainite Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000007528 sand casting Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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)
- Paper (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は製紙機械や製鉄機械等の耐摩耗性を有する部分
に適用される２層遠心鋳造ロールの外層材に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an outer layer material of a two-layer centrifugal casting roll that is applied to a wear-resistant part of a paper making machine, a steel making machine, etc.
従来の耐摩耗性を有する２層遠心鋳造ロールは鋳込後の
冷却速度が速い金型法と冷却速度の遅い砂型法によシ製
作されている。金型法は大径サイズ（外径５０インチ以
上）を製作するにはコア厚さが大きくなシすぎ不向きと
されておシ、小径（上記以下）から大径まで多種多様な
ロールを製作する場合製品安定性から砂型が採用されて
いる。Conventional two-layer centrifugal casting rolls with wear resistance are manufactured by a mold method, which has a fast cooling rate after casting, and a sand mold method, which has a slow cooling rate. The mold method is considered unsuitable for producing large diameter rolls (outside diameter of 50 inches or more) because the core thickness is too large, and it is used to produce a wide variety of rolls from small diameters (below the above) to large diameters. In some cases, sand molds are used due to product stability.
この砂型法による２層遠心鋳造ロールの外層かたさはシ
ョアーかたさくＨｓ）で７４〜７７を示している。この
時の外層は基地がパーライト〜ト〃−スタイトで炭化物
を面積率で４０〜５０％有している。The hardness of the outer layer of the two-layer centrifugal casting roll produced by this sand casting method is 74 to 77 in Shore hardness (Hs). At this time, the outer layer has a base of pearlite to tostite and has carbide in an area ratio of 40 to 50%.
ロール表面硬度が現在の所特殊な表面処理を施さない場
合、砂型法ではＨｓ ７６程度であシ、ある程度の耐摩
耗性を有しているが、ロール表面の摩耗による肌荒れ等
で研磨周期が１〜３力月程度と言われている。At present, if the roll surface hardness is not subjected to special surface treatment, the sand casting method has a hardness of about Hs 76, and has a certain degree of wear resistance, but the polishing cycle is limited due to roughness due to roll surface wear. It is said to be about 3 months old.
本発明はこの摩耗による研磨周期を延ばすことによシ砂
型法によるロール寿命と省コスト化を計ろうとするもの
である。The present invention aims to prolong the life of the rolls and reduce costs by extending the polishing cycle due to this wear.
本発明は重量％で、Ｃ：五４〜４％、 Ｎｔ： ｔ５〜
３％ 、Ｍｏ： α５〜２．５％ 、Ｃｒ： ２〜
３ ％ 、Ｖ；１〜２．５％で残部が実質的にＦｅより
なり、かつ炭化物面積率が４０〜６０％であることを特
徴とする遠心鋳造法によって製造される耐摩耗性、耐肌
荒性を有する２層ロールの外層材である。The present invention has a weight percentage of C: 54~4%, Nt: t5~
3%, Mo: α5~2.5%, Cr: 2~
3%, V; 1 to 2.5%, the balance substantially consisting of Fe, and a carbide area ratio of 40 to 60%.A wear-resistant and skin-resistant product manufactured by a centrifugal casting method. This is the outer layer material of a two-layer roll with roughness.
本発明は基地組織のベーナイト化による高硬度化及び炭
化物の増量と微細化による高硬度化を図っているもので
あって、このためベーナイト化にはＭｏの効果を期待し
、炭化物の増加と均一分散（微細化）のために■を添加
するものである。The present invention aims to increase the hardness by converting the base structure into bainite, and to increase the hardness by increasing the amount of carbides and making them finer. Therefore, the effect of Mo is expected for bainite conversion, and the increase in carbides and uniformity is achieved. ■ is added for dispersion (refining).
以下、本発明における砂型法による多層ロールの外層材
の成分限定理由及び炭化物面積率の限定理由について説
明する。Hereinafter, the reasons for limiting the components of the outer layer material of the multilayer roll formed by the sand casting method and the reasons for limiting the carbide area ratio in the present invention will be explained.
Ｎ１及びＭＯ；基地組織を高靭性高硬度化、すなわちベ
ーナイト化（換言すると非マルテンサイＦ化）するため
には、Ｎ１は重量％（以下、同じ）で３Ｘ以下、Ｍｏは
２．５％以下にするのがよく、非トルースタイト化ない
しは非バーフィト化のためにはＮ１はｔ５％以上、ＭＯ
は［Ｌ５％以上が必要である。そのためＮ１；ｔ５〜３
％１ＭＯ；ｎ、ｓ〜２．５％とした。N1 and MO: In order to make the matrix structure high in toughness and hardness, that is, to make it bainite (in other words, to make it non-martensitic), N1 should be reduced to 3X or less in weight% (the same applies hereinafter), and Mo should be reduced to 2.5% or less. For non-troostite or non-burfit, N1 should be t5% or more, MO
[L5% or more is required. Therefore, N1; t5~3
%1MO; n, s ~ 2.5%.
Ｖ；このものは炭化物の均一分散のために必要な成分で
、１％未満では炭化物の微細分散に効果がなく、 ２．
５％を超えるとＶ炭化物の共晶化が生じ始め炭化物の微
細均一化が不可能になるので、ｖ；１〜２．５Ｘとした
。V: This is a necessary component for uniform dispersion of carbides, and if it is less than 1%, it has no effect on fine dispersion of carbides. 2.
If it exceeds 5%, eutectic formation of V carbides begins to occur and it becomes impossible to make the carbides fine and uniform, so v is set at 1 to 2.5X.
Ｃｒ；炭化物量はＣｒとＣの量によって決定され、Ｃｒ
が２％未満であると炭化物の成長が大きく、かつ面積率
として４０％を割シ、３％を超えると炭化物の面積率は
６０％を超え脆化するため、Ｃｒ：２〜３％とした。Cr: The amount of carbide is determined by the amount of Cr and C, and Cr
When Cr is less than 2%, the growth of carbides is large and the area ratio is 40%, and when it exceeds 3%, the area ratio of carbides exceeds 60% and becomes brittle, so Cr: 2 to 3%. .
Ｃ；基地組織と炭化物の量はＣの量によって左右され、
上記Ｍｏ、 Ｎｉ、 Ｖ、 Ｃｒ及び炭化物面積率の範
囲内でＣ量は五４〜４％が必要である。C: The base structure and the amount of carbide depend on the amount of C,
Within the above range of Mo, Ni, V, Cr and carbide area ratio, the amount of C is required to be 54 to 4%.
炭化物面積率：炭化物量は主としてＣｒとＣの量によっ
て決定されることは上述の通シであるが、炭化物面積率
が４０％未満では、いかに炭化物を分散させても硬度不
足となシ、６０％を超えると外層材の脆化が大きくなシ
割れが発生し易くなるので、４０〜６０％の範囲とした
。Carbide area ratio: As mentioned above, the amount of carbide is mainly determined by the amount of Cr and C, but if the carbide area ratio is less than 40%, hardness will be insufficient no matter how much carbide is dispersed. If it exceeds 40% to 60%, the outer layer material becomes brittle and cracks are likely to occur.
更に、一般的に８１及びＭｎは共に脱酸剤として添加さ
れるが、Ｓｉが０．２％未満であると基地の硬化度が敏
感となり耐割れ性が低下し易く、α６％を超えると炭化
物の安定度に悪い影響を及ぼす。一方、Ｍｎが１ｌＬ５
％未満では基地の組織安定性に悪い影響を及ぼし、α８
％を超えると基地の硬化に敏感になシ易い。従づてＳｌ
はα３〜α６％、Ｍｎは１５〜（１８％の範囲が好まし
い。Furthermore, both 81 and Mn are generally added as deoxidizing agents, but if Si is less than 0.2%, the degree of hardening of the base becomes sensitive and cracking resistance tends to decrease, and if Si exceeds 6%, carbide has a negative effect on the stability of On the other hand, Mn is 1lL5
If it is less than %, it will have a negative effect on the structural stability of the base, and α8
If it exceeds %, it tends to be sensitive to hardening of the base. Accordingly, Sl
is α3 to α6%, and Mn is preferably in the range of 15 to (18%).
以下、本発明の多層ロールの外層材の具体的実施例をあ
げ、本発明の効果を立証する。その実施例を表１に示す
。Hereinafter, specific examples of the outer layer material of the multilayer roll of the present invention will be given to demonstrate the effects of the present invention. Examples are shown in Table 1.
表１から明らかなように、従来材質を外層とする２Ｍロ
ールでは外層の硬度不足ないしは耐熱衝撃性低下のため
割れが発生しているが、本発明の夾施例の外層材では高
硬度（Ｈｓ＝８０〜８５）を達成することができる。As is clear from Table 1, cracks occur in the 2M roll with conventional material as the outer layer due to insufficient hardness or decreased thermal shock resistance of the outer layer, but with the outer layer material of the example of the present invention, high hardness (Hs =80-85) can be achieved.
Ｇｍ７５による砂型遠心鋳造法で、内層を普通鋳鉄（鋳
込温度１３００℃）、外層を表１の随１とＮ１１Ｌ４（
鋳込温度１３２０℃）を用いて、５２９φ×外階３０ｔ
×内層５０ ｔ Ｘ ７． ＯＯＯ２のロールを鋳造し
た。それらの外層の金属組織のｔｌＪｉＩ微鏡写真（倍
率１００倍）を第１図（ａ）。Gm75 sand mold centrifugal casting method was used, the inner layer was made of ordinary cast iron (casting temperature 1300℃), and the outer layer was made of No. 1 in Table 1 and N11L4 (
Casting temperature: 1320℃), 529φ x outer floor 30t
x inner layer 50t x 7. A roll of OOO2 was cast. Figure 1(a) is a tlJiI micrograph (100x magnification) of the metal structure of the outer layer.
υ）に示す。従来材（表１のＮ１１）の第１図（ａ）か
られかるように、大きな共晶灰化物とトルースタイト基
地から構成されているのに対し、本発明材（表１の随５
）は微細膨化物と上部ベーナイト組織から構成され硬度
目標とも十分に満足できるものであった。υ). As can be seen from Figure 1(a) of the conventional material (N11 in Table 1), it is composed of large eutectic ash and troostite base, whereas the material of the present invention (N11 in Table 1)
) was composed of fine expanded matter and upper bainite structure and fully satisfied both hardness targets.
本発明品によると、従来の摩耗及び肌荒れによる研磨周
期（表面粗さで５０〜１００秒程度の摩耗ピットの出る
時間）が２力月（約１５００Ｈｒ）であったが６力月（
約４０００Ｈｒ）まで延ばすことができた。According to the product of the present invention, the conventional polishing cycle due to wear and surface roughness (the time it takes for wear pits to appear, which is approximately 50 to 100 seconds due to surface roughness) was 2 months (approximately 1500 hours), but 6 months (about 1500 hours).
It was possible to extend it to approximately 4000 hours).
第１同社本発明の一実施例の外層材と従来材の外層材の
金属組織の顕Ｗｌ鏡写貞（１００倍）であり、（ａ）は
従来材の外層材、←）は本発明の一実施例の外層材であ
る。1. This is a micrograph (100x) of the metal structure of the outer layer material of an example of the present invention and the outer layer material of the conventional material, (a) is the outer layer material of the conventional material, and ←) is the outer layer material of the present invention. It is an outer layer material of one example.
Claims (1)
Ｍｏ；０．５〜２．５％、Ｃｒ；２〜３％、Ｖ；１〜２
．５％で残部が実質的にＦｅよりなり、かつ炭化物面積
率が４０〜６０％であることを特徴とする遠心鋳造法に
よつて製造される耐摩耗性、耐肌荒性を有する２層ロー
ルの外層材。In weight%, C: 3.4-4%, Ni: 1.5-3%,
Mo: 0.5-2.5%, Cr: 2-3%, V: 1-2
．． A two-layer roll having abrasion resistance and roughness resistance, manufactured by a centrifugal casting method, characterized in that the balance is substantially Fe at 5% and the carbide area ratio is 40 to 60%. outer layer material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62041458A JP2596928B2 (en) | 1987-02-26 | 1987-02-26 | Outer layer material of two-layer roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62041458A JP2596928B2 (en) | 1987-02-26 | 1987-02-26 | Outer layer material of two-layer roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63210255A true JPS63210255A (en) | 1988-08-31 |
| JP2596928B2 JP2596928B2 (en) | 1997-04-02 |
Family
ID=12608929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62041458A Expired - Lifetime JP2596928B2 (en) | 1987-02-26 | 1987-02-26 | Outer layer material of two-layer roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596928B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570884A (en) * | 1991-09-12 | 1993-03-23 | Kawasaki Steel Corp | External material for roll for rolling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57149450A (en) * | 1981-03-10 | 1982-09-16 | Nippon Steel Corp | Hot-mill roll excellent in wear-resistance and thermal fatigue-resistance |
-
1987
- 1987-02-26 JP JP62041458A patent/JP2596928B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57149450A (en) * | 1981-03-10 | 1982-09-16 | Nippon Steel Corp | Hot-mill roll excellent in wear-resistance and thermal fatigue-resistance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570884A (en) * | 1991-09-12 | 1993-03-23 | Kawasaki Steel Corp | External material for roll for rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2596928B2 (en) | 1997-04-02 |
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