JPS63266041A - Roll for hot rolling - Google Patents

Roll for hot rolling

Info

Publication number
JPS63266041A
JPS63266041A JP9867887A JP9867887A JPS63266041A JP S63266041 A JPS63266041 A JP S63266041A JP 9867887 A JP9867887 A JP 9867887A JP 9867887 A JP9867887 A JP 9867887A JP S63266041 A JPS63266041 A JP S63266041A
Authority
JP
Japan
Prior art keywords
roll
less
carbide
hardness
outer shell
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
Application number
JP9867887A
Other languages
Japanese (ja)
Inventor
Shogo Tomita
省吾 冨田
Shosei Kamata
鎌田 正誠
Tatsuro Udagawa
辰郎 宇田川
Takayuki Morioka
森岡 隆幸
Tatsuhiko Kobayashi
竜彦 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP9867887A priority Critical patent/JPS63266041A/en
Publication of JPS63266041A publication Critical patent/JPS63266041A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, 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)

Abstract

PURPOSE:To produce the titled roll having more improved hardness and wear resistance by subjecting the outer shell part of the roll for hot rolling contg. hard metallic carbide to a heat treatment under specific conditions, thereby depositing the NC type metallic carbide having higher hardness on said part. CONSTITUTION:The outer shell part of the composite roll for hot rolling is produced by a low alloy steel contg., by weight, 2.1-2.8% C, <1% Si, <1% Mn, <0.03% P, <0.03% S, <0.8% Ni, 0.9-1.7% Cr, >0.3% Mo, 1-2% V, <1.7% Co, 4.0-5.4% W and <6.4% Nb. Cr depositer Cr7C3 of the hard carbide and the titled roll contg. the outer shell part which has high hardness and excellent wear resistance is thereby produced. Said outer shell part is furthermore quenched at 900-1,100 deg.C to deposite the high hard MC type carbide such as VC, WC, NbC, etc., into a matrix and is successively tempered at 500-800 deg.C to improve the thermal shock resistance of said part. By this method, the titled roll suitable for severe rolling such as the rolling of high alloy steel, etc., and having excellent hardness, strength and wear resistance can be obtd.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は高合金鋼や低温加熱材の圧延のような圧延条
件の過酷な圧延を行う場合に適した熱間圧延用ロールに
関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot rolling roll suitable for rolling under severe rolling conditions such as rolling of high alloy steel or low temperature heating material.

〔従来の技術〕[Conventional technology]

従来熱間圧延用ロールには、アダマイトロールおよび高
C「鋳鉄ロールが使用されていた。アダマイトロールの
化学成分は、重量%でC:1.5〜1.9゜Si:0.
3〜0.6.Mn:0.5〜1.0. P :0.02
以下、 S :0.01以下、Ni: 0.3〜1.0
.Or:0.8〜1.2.Mo:0.3〜1.0と残部
がFeからなり、鋼と鋳鉄の中間に位置する。
Conventionally, Adamite rolls and high C cast iron rolls have been used as rolls for hot rolling.The chemical composition of Adamite rolls is C: 1.5 to 1.9 degrees, Si: 0.
3-0.6. Mn: 0.5-1.0. P:0.02
Hereinafter, S: 0.01 or less, Ni: 0.3 to 1.0
.. Or: 0.8-1.2. Mo: 0.3 to 1.0, with the remainder being Fe, and is located between steel and cast iron.

その金属組織はマトリックスがソルバイトであり、その
中にFe5C(セメンタイト)が分散している。
Its metal structure has a matrix of sorbite, in which Fe5C (cementite) is dispersed.

また高Cr鋳鉄ロールの化学成分は、重量%でC:2.
5〜3.0.Si:0.3〜0.6.Mn:0.5〜1
.2. P :0.08以下、 S :0.05以下、
 Ni:0.5〜2.5 、Or:15〜25.No:
0.5〜2.0と残部がFeからなり、その特徴は炭化
物としてFe5Cよりも硬さの高いCryC3をベース
にしていることにある。そのため高Cr鋳鉄ロールの耐
用度は、アダマイトロールのそれよりも2割はど良好で
ある。
The chemical composition of the high Cr cast iron roll is C:2.
5-3.0. Si: 0.3-0.6. Mn: 0.5-1
.. 2. P: 0.08 or less, S: 0.05 or less,
Ni: 0.5-2.5, Or: 15-25. No:
0.5 to 2.0, with the remainder being Fe, and its feature is that it is based on CryC3, which is harder than Fe5C as a carbide. Therefore, the durability of high Cr cast iron rolls is 20% better than that of Adamite rolls.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述した従来の熱間圧延用ロールには、次のような問題
点があった。
The conventional hot rolling roll described above has the following problems.

(1)アダマイトロール 熱間での硬さが低いため、耐用度(耐摩耗性)の向上が
期待できず、過酷な圧延条件に対応できない。
(1) Adamite rolls have low hardness when hot, so no improvement in durability (wear resistance) can be expected, and they cannot cope with severe rolling conditions.

(2)高Cr鋳鉄ロール アダマイトロールよりも耐用度(#摩耗性)があるが、
将来現在のロールの耐用度よりも飛躍的に耐用度が向上
することはその化学成分や製造技術から期待できず、ア
ダマイトロール同様過酷な圧延条件に対応できない。
(2) High Cr cast iron rolls are more durable (#abrasion resistant) than Adamite rolls, but
Due to its chemical composition and manufacturing technology, it cannot be expected that the durability will be dramatically improved in the future compared to the current roll durability, and it cannot handle the harsh rolling conditions like Adamite rolls.

この発明は以上のような従来技術の問題点を解消し、高
合金鋼や低温加熱材の圧延のように圧延条件の過酷な圧
延を行う場合に適した熱間圧延用ロールを安価に提供す
ることを目的としている。
The present invention solves the problems of the prior art as described above, and provides a low-cost hot rolling roll suitable for rolling under severe rolling conditions such as rolling of high alloy steel or low-temperature heating materials. The purpose is to

〔・問題を解決するための手段〕[・Means to solve the problem]

この発明は 重量%でC: 2.1〜2.6.Si:1.0以下、M
n:1.0以下。
This invention has a C: 2.1-2.6% by weight. Si: 1.0 or less, M
n: 1.0 or less.

P:0.03以下、S:0.03以下、Ni:O’、8
以下、Cr:0.9〜1.7.Mo:0.3以上、  
V :1.0〜2.0.Co+1.7以下、W:4、0
〜5.4、Nb:6.4以下を含有し、残部がFeおよ
び不可避的不純物からなる金属で外殻を構成した熱間圧
延用ロールであり、さらには重量%でC:2.1〜2.
6.Si:1.0以下、Mn:1.0以下、 P:0.
03以下。
P: 0.03 or less, S: 0.03 or less, Ni: O', 8
Hereinafter, Cr: 0.9 to 1.7. Mo: 0.3 or more,
V: 1.0-2.0. Co+1.7 or less, W: 4, 0
~5.4, Nb: 6.4 or less, the balance is Fe and inevitable impurities, and the outer shell is made of a metal, and furthermore, C:2.1~ by weight% 2.
6. Si: 1.0 or less, Mn: 1.0 or less, P: 0.
03 or less.

S :0.03以下、Ni:0.8以下、Cr:0.9
〜1.7.Mo:0.3以上、 V:1.0〜2.0.
Co:1.7以下、 W:4、0〜5.4、Nb:11
1.4以下を含有し、残部がFeおよび不可避的不純物
からなる金属を900− tioo℃で焼入れし、 5
00〜800℃で焼戻して>4cタイプの二次炭化物を
析出させた材料でロール外殻を構成した熱間圧延用ロー
ルである。
S: 0.03 or less, Ni: 0.8 or less, Cr: 0.9
~1.7. Mo: 0.3 or more, V: 1.0 to 2.0.
Co: 1.7 or less, W: 4, 0 to 5.4, Nb: 11
1.4 or less, with the remainder consisting of Fe and unavoidable impurities, is quenched at 900-tioo°C,
This is a hot rolling roll whose outer shell is made of a material tempered at 00 to 800°C to precipitate >4c type secondary carbide.

〔作用〕[Effect]

このように成分を限定したのは以下の理由によるもので
ある。
The reason for limiting the components in this way is as follows.

Cは鋳造時にCr7G3タイプの一次炭化物を、また熱
処理することによりマトリックス中にHCタイプの二次
炭化物(VC,We、NbC)を形成しマトリックスを
強化するが、多過ぎると脆くなり、ロールの折損事故に
つながるので、2.1〜2.8重量%に限定した。
C forms Cr7G3 type primary carbide during casting, and HC type secondary carbide (VC, We, NbC) in the matrix by heat treatment to strengthen the matrix, but if it is too much it will become brittle and cause breakage of the roll. Since this may lead to accidents, the content was limited to 2.1 to 2.8% by weight.

Siは脱酸剤であり、溶湯の流動性を良くするが、多過
ぎると脆くなるので1.00重量%以下とした。
Si is a deoxidizing agent and improves the fluidity of the molten metal, but if it is too large, it becomes brittle, so the content was set to 1.00% by weight or less.

Mnは脱酸の補助剤であるので、1.0重量%以下とし
た。
Since Mn is an auxiliary agent for deoxidation, it was set to 1.0% by weight or less.

PおよびSはロールの材質を脆くするので、それぞれ0
.03重量%以下とした。
P and S make the material of the roll brittle, so they should each be set at 0.
.. 03% by weight or less.

旧はマトリックスの焼入性を向上させるが、多過ぎると
残留オーステナイトが多くなり、硬さが低下するので0
.8重量%以下とした。
Old improves the hardenability of the matrix, but if it is too large, retained austenite increases and hardness decreases, so 0
.. The content was set to 8% by weight or less.

Orは鋳造時にCr7(3タイプの炭化物を形成して一
次炭化物を硬くシ、熱処理することによりマトリックス
中に二次炭化物としても析出し硬さを上げ、耐摩耗性を
向上するので下限を0.9重量%とじ、上限はフェライ
トが増えることによる靭性の低下を考慮して 1.7重
量%とした。
Or is Cr7 (forms three types of carbide to harden the primary carbide) during casting, and by heat treatment, it precipitates as a secondary carbide in the matrix to increase hardness and improve wear resistance, so the lower limit is set to 0. The content was set at 9% by weight, and the upper limit was set at 1.7% by weight in consideration of the decrease in toughness due to an increase in ferrite.

=Moは焼戻し軟化抵抗を高め、−C炭化物を強化する
ので0.3重量%以上とした。
=Mo increases the tempering softening resistance and strengthens the -C carbide, so the content was set to 0.3% by weight or more.

■は熱処理時にVC炭化物が析出し、硬さを上げ耐摩耗
性を向上させるので下限を1.0重量%とし、多過ぎる
とVC炭化物が多くなり過ぎ、母材強度を低下させるの
で上限を2.0fi 3%とじた。
For (2), VC carbide precipitates during heat treatment, increasing hardness and improving wear resistance, so the lower limit is set at 1.0% by weight.If it is too large, VC carbide increases too much and reduces the strength of the base material, so the upper limit is set at 2. .0fi 3% binding.

Goはマトリックスを強化し耐熱性を上げるが。Go strengthens the matrix and increases heat resistance.

効果が飽和するので1.70重量%を上限とした。Since the effect is saturated, the upper limit was set at 1.70% by weight.

Wは熱処理時にWC炭化物が析出し、硬さを」二げ耐摩
耗性を向上させるので下限を4、0重に%とし、多過ぎ
るとWC炭化物が多くなりすぎて母材(またはマトリッ
クス)強度を低下させるので上限を5.4重量%とした
Since WC carbide precipitates during heat treatment and improves hardness and wear resistance, the lower limit of W is set at 4% to 0%. If it is too large, WC carbide becomes too large and the strength of the base material (or matrix) decreases. Therefore, the upper limit was set at 5.4% by weight.

Nbは一次炭化物を強化し、かつ熱処理によりNbC炭
化物を析出して硬さを上げ耐摩耗性を向−ヒさせるが、
多過ぎると母材強度を低下させるので6.4重量%以下
とした。
Nb strengthens primary carbides and precipitates NbC carbides through heat treatment, increasing hardness and improving wear resistance.
If the amount is too large, the strength of the base material will be reduced, so the amount is set at 6.4% by weight or less.

以上の成分の鋼を鋳造し、鋳造時にC「7C3の一次炭
化物を析出させる。さらには第2発明のように、熱処理
を行いマトリックス中にMCタイプの二次炭化物(VC
,WC,NbC)を析出させる。この時の熱処理条件は
、適正な炭化物を析出させるための300〜】100℃
の焼入れと、熱間圧延での耐熱衝撃性および適切な靭性
を得るための500〜800℃焼戻しく第1図)がよい
ことを知見した。 MCタイプの二次炭化物は、第2図
にみられるようにFeaCタイプ炭化物やCr7C3タ
イプ炭化物よりも硬く耐摩耗性に優れており、第3図、
第4図に示すようにアダマイトロールあるいは高Cr鋳
鉄ロールよりも2倍以上の#席耗性を有する。
Steel with the above components is cast, and primary carbides of C7C3 are precipitated during casting.Furthermore, as in the second invention, heat treatment is performed to form MC type secondary carbides (VC) in the matrix.
, WC, NbC). The heat treatment conditions at this time are 300 to 100°C to precipitate appropriate carbides.
It has been found that quenching and tempering at 500 to 800° C. (Fig. 1) to obtain thermal shock resistance and appropriate toughness during hot rolling are effective. As shown in Figure 2, MC type secondary carbide is harder and has better wear resistance than FeaC type carbide and Cr7C3 type carbide, and as shown in Figure 3,
As shown in Figure 4, it has a wear resistance more than twice that of Adamite rolls or high Cr cast iron rolls.

またこの熱処理によるロール硬さの目F値はHs50〜
80であり、耐摩耗性とともに靭性をも保持している。
In addition, the F value of the roll hardness due to this heat treatment is Hs50 ~
80, which maintains not only wear resistance but also toughness.

鋳造を遠心鋳造法で行えば、これをロールの外殻とし、
ロールの芯部を鋳鋼、鋳鉄および鍛鋼等として、複合化
し靭性を上げるとともにロールの製造コストを下げるこ
とができる。またその組立てる方法も、ロールの芯部が
まだ未凝固の状態の時に芯部の外周に本発明の成分の鋼
を鋳込み、遠心鋳造法で仕上げるか、ロールの外殻のみ
を遠心鋳造法で製造した後、完成しているロール芯部に
挿入し、焼はめ、拡散固着および溶接等で固定してもよ
い。
If casting is performed using the centrifugal casting method, this will be the outer shell of the roll,
The core of the roll can be made of cast steel, cast iron, forged steel, etc. to increase toughness and reduce the manufacturing cost of the roll. The method for assembling the roll is either to cast the steel of the composition of the present invention around the outer periphery of the roll core while it is still in an unsolidified state and finish it using the centrifugal casting method, or to manufacture only the outer shell of the roll using the centrifugal casting method. After that, it may be inserted into the completed roll core and fixed by shrink fitting, diffusion fixing, welding, etc.

〔実施例〕〔Example〕

外殻が第1表の化学成分の本発明のロールを鋳造した後
、表に示すような熱処理を行い、同じく表に示す硬さの
ロールを製造し、摩耗試験を行った。なお第1表には、
本発明のロールと耐摩耗性を比較したアダマイトロール
の化学成分、熱処理条件およびその硬さも合わせて示し
た。
After casting the rolls of the present invention whose outer shells had the chemical components shown in Table 1, they were subjected to heat treatment as shown in the table, and rolls having the hardness shown in the table were also produced and subjected to wear tests. In Table 1,
The chemical composition, heat treatment conditions, and hardness of an Adamite roll whose wear resistance was compared with that of the roll of the present invention are also shown.

摩耗試験は第2表の試験材を用い、第3表の圧延条件で
行った。
The wear test was conducted using the test materials shown in Table 2 under the rolling conditions shown in Table 3.

第2表 第3表 また対象試験ロールは、第1表のAT−1、AT−2。Table 2 Table 3 The target test rolls are AT-1 and AT-2 in Table 1.

ATIA、ATIB オJ:びAT IG トし、比較
試験ロールトシてAD(アダマイトロール)を対象とし
た。第3図(a)および(b)は圧延荷重が3.0トン
、クーラント流量が1.IJ/minの時のパス回数と
平均摩耗深さおよび摩耗減縫の関係のグラフであり、本
発明のロールであるAT−1とアダマイトロールとを比
較して示した。この図から明らかなように、本発明のロ
ールのAT−1のほうが、アダマイトロールに比較して
格段に耐摩耗性がよいことが分かる。
ATIA, ATIB OJ: and AT IG were used as comparative test rolls, and AD (adamite roll) was used as the target. In Figures 3(a) and 3(b), the rolling load is 3.0 tons and the coolant flow rate is 1. It is a graph of the relationship between the number of passes at IJ/min, average abrasion depth, and abrasion stitch reduction, and shows a comparison between AT-1, which is a roll of the present invention, and an Adamite roll. As is clear from this figure, it can be seen that the roll of the present invention, AT-1, has much better wear resistance than the Adamite roll.

第4図(a)および(b)は圧延荷重が3.0トン、ク
ーラント流量が1.5e/winの時のパス回数と平均
摩耗深さおよび摩耗減量の関係のグラフであり、本発明
のロールであるATIA、ATIBおよびATIGとア
ダマイトロールとを比較して示した。この場合も第3図
同様優れた耐摩耗性を示している。
FIGS. 4(a) and 4(b) are graphs of the relationship between the number of passes, average wear depth, and wear loss when the rolling load is 3.0 tons and the coolant flow rate is 1.5e/win. A comparison of the rolls ATIA, ATIB, and ATIG with Adamitrol is shown. In this case as well, excellent wear resistance is shown as in FIG.

〔発明の効果〕〔Effect of the invention〕

この発明により、ロールの外殻にCr7G3タイプの一
次炭化物等を析出させて硬さを上げ、耐摩耗性を向上さ
せることができるとともに、靭性も高くでき、さらに熱
処理によりMCタイプの二次炭化物を析出させた場合は
、圧延負荷や熱負荷の大きい圧延に適用することができ
る。また耐摩耗性が2倍以上に向上するので長時間連続
圧延が可能となるので、ロール原単位の低減ができると
ともに、省資源、省エネルギーにもつながるので、その
効果は大きい。
With this invention, it is possible to precipitate Cr7G3 type primary carbide etc. on the outer shell of the roll to increase hardness and improve wear resistance, as well as increase toughness, and furthermore, by heat treatment, MC type secondary carbide can be precipitated. When precipitated, it can be applied to rolling with large rolling loads and heat loads. In addition, since the wear resistance is improved by more than twice, continuous rolling for a long time is possible, and the roll unit consumption can be reduced, and this also leads to resource and energy conservation, which is highly effective.

【図面の簡単な説明】[Brief explanation of drawings]

・第1図は本発明ロールの熱処理温度と硬度との関係を
示すグラフ、第2図は鋼中炭化物の硬度を比較したグラ
フ、第3図(a)はロールのパス回数と平均摩耗深さの
関係を示すグラフ、第3図(b)はロールのパス回数と
摩耗減量の関係を示すグラフ、第4図(a)はロールの
パス回数と平均摩耗深さとの関係を示すグラフ、第4図
(b)は同じくロールのパス回数と摩耗減量との関係を
示すグラフ。
・Figure 1 is a graph showing the relationship between heat treatment temperature and hardness of the roll of the present invention, Figure 2 is a graph comparing the hardness of carbides in steel, and Figure 3 (a) is the number of roll passes and average wear depth. 3(b) is a graph showing the relationship between the number of roll passes and the wear loss. FIG. 4(a) is a graph showing the relationship between the number of roll passes and the average wear depth. Figure (b) is a graph showing the relationship between the number of passes of the roll and the amount of wear loss.

Claims (1)

【特許請求の範囲】 1、重量%でC:2.1〜2.8、Si:1.0以下、
Mn1.0以下、P:0.03以下、S:0.03以下
、Ni:0.8以下、Cr:0.9〜1.7、Mo:0
.3以上、V:1.0〜2.0、Co:1.7以下、W
:4.0〜5.4、Nb:6.4以下を含有し、残部が
Feおよび不可避的不純物からなる金属で外殻を構成し
た熱間圧延用ロール。 2、重量%でC:2.1〜2.8、Si:1.0以下、
Mn:1.0以下、P:0.03以下、S:0.03以
下、Ni:0.8以下、Cr:0.9〜1.7、Mo:
0.3以上、V:1.0〜2.0、Co:1.7以下、
W:4.0〜5.4、Nb:6.4以下を含有し、残部
がFeおよび不可避的不純物からなる金属を900〜1
100℃で焼入れし、500〜800℃で焼戻してMC
タイプの二次炭化物を析出させた材料でロール外殻を構
成し熱間圧延用ロール。
[Claims] 1. C: 2.1 to 2.8 in weight %, Si: 1.0 or less,
Mn: 1.0 or less, P: 0.03 or less, S: 0.03 or less, Ni: 0.8 or less, Cr: 0.9 to 1.7, Mo: 0
.. 3 or more, V: 1.0 to 2.0, Co: 1.7 or less, W
Nb: 4.0 to 5.4, and Nb: 6.4 or less, with the remainder consisting of Fe and unavoidable impurities. 2. C: 2.1 to 2.8, Si: 1.0 or less in weight%,
Mn: 1.0 or less, P: 0.03 or less, S: 0.03 or less, Ni: 0.8 or less, Cr: 0.9 to 1.7, Mo:
0.3 or more, V: 1.0 to 2.0, Co: 1.7 or less,
W: 4.0-5.4, Nb: 6.4 or less, with the balance consisting of Fe and unavoidable impurities.
Harden at 100℃ and temper at 500-800℃ to make MC
A roll for hot rolling whose outer shell is made of a material that precipitates secondary carbides.
JP9867887A 1987-04-23 1987-04-23 Roll for hot rolling Pending JPS63266041A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9867887A JPS63266041A (en) 1987-04-23 1987-04-23 Roll for hot rolling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9867887A JPS63266041A (en) 1987-04-23 1987-04-23 Roll for hot rolling

Publications (1)

Publication Number Publication Date
JPS63266041A true JPS63266041A (en) 1988-11-02

Family

ID=14226171

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9867887A Pending JPS63266041A (en) 1987-04-23 1987-04-23 Roll for hot rolling

Country Status (1)

Country Link
JP (1) JPS63266041A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996027688A1 (en) * 1995-03-07 1996-09-12 Kawasaki Steel Corporation Cladding material for centrifugal casting roll

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996027688A1 (en) * 1995-03-07 1996-09-12 Kawasaki Steel Corporation Cladding material for centrifugal casting roll
EP0760398A1 (en) * 1995-03-07 1997-03-05 Kawasaki Steel Corporation Cladding material for centrifugal casting roll
US5738734A (en) * 1995-03-07 1998-04-14 Kawasaki Steel Corporation Centrifugal cast roll shell material
EP0760398A4 (en) * 1995-03-07 1998-07-15 Kawasaki Steel Co Cladding material for centrifugal casting roll
CN1062610C (en) * 1995-03-07 2001-02-28 川崎制铁株式会社 Cladding material for centrifugal casting roll

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