JPS5837154A - Work roll for preceding stand of row of six-stage rolling mill - Google Patents
Work roll for preceding stand of row of six-stage rolling millInfo
- Publication number
- JPS5837154A JPS5837154A JP13642781A JP13642781A JPS5837154A JP S5837154 A JPS5837154 A JP S5837154A JP 13642781 A JP13642781 A JP 13642781A JP 13642781 A JP13642781 A JP 13642781A JP S5837154 A JPS5837154 A JP S5837154A
- Authority
- JP
- Japan
- Prior art keywords
- work roll
- rolling mill
- row
- roll
- hardness
- 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
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は6段圧延機列の前段スタンド用ワークロールに
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work roll for a front stand of a six-high rolling mill row.
近年、冷間圧延においては4段圧延機に代え、バックア
ップロールとワークロールとの間に中間ロールを設け、
該中間ロールの中方向への左右動により形状性制御が行
ないうる6段圧延機が使用されるに至っている。In recent years, in cold rolling, instead of using a four-high rolling mill, an intermediate roll is installed between a backup roll and a work roll.
Six-high rolling mills have come into use in which the shape can be controlled by moving the intermediate roll laterally in the middle direction.
本発明者らは先に上記6段圧延機用ワークロールとして
、
CO,7〜1.6%、SiO,15〜1.6%、Mn0
.15〜1.6%、Cr3,5〜12%を含み、CとC
rとの関係が
16zcr%+15×C%427
Cr%=<21XC%−9
を同時に満足する関係にあり、かつMoQ、4〜3%、
V O,2〜2%の1種又は2種を含み、残部鉄及び不
純物からなり、表面硬度をI(V720〜800に調整
したものが耐摩耗性及び耐スポーリング性に優れた性状
を示すことを見い出し、特許出願をした(特願昭55−
123208号)。The present inventors previously prepared the above-mentioned work roll for the 6-high rolling mill using CO, 7-1.6%, SiO, 15-1.6%, Mn0.
.. 15-1.6%, Cr3, containing 5-12%, C and C
The relationship with r satisfies 16zcr%+15×C%427 Cr%=<21XC%-9, and MoQ, 4 to 3%,
Containing one or two types of VO, 2 to 2%, the balance being iron and impurities, and having a surface hardness of I (V720 to 800) exhibits excellent wear resistance and spalling resistance. I discovered this and filed a patent application (patent application 1982-
123208).
しかしながら、その後さらに研究を重ねた結果、特に6
段圧延機列の前段スタンドでは圧下量を大きくした高圧
下圧延が行われるため、圧延材との咬み込みが充分に行
われるように従来の4段圧延機のワークロールより表面
粗さの大きいワークロールを使用することが必要であり
、さらに優れた耐摩耗性を有するだけでな(、圧延中に
表面粗さが小さくなってスリップが発生しないようにい
わゆるスクラッチ保持性の良い材質が必要であることを
知った。However, as a result of further research, in particular 6
Since high-reduction rolling with a large reduction amount is performed in the front stand of the high-rolling mill row, the workpiece has a rougher surface than the work roll of a conventional 4-high rolling mill to ensure sufficient engagement with the rolled material. It is necessary to use a roll, and it is necessary to use a material that not only has excellent wear resistance (but also has good scratch retention so that the surface roughness becomes small during rolling and slip does not occur). I learned that.
そこで、本発明者らは、6段圧延機列の前段スタンド用
ワークロールにおける上述の課題を解決すべく鋭意研究
を重ねた結果、マl−IJッス硬度の増大に伴なって耐
摩耗性は向上するが、材料中に含まれる炭化物粒子が摩
耗に対して抵抗する役割を果すものと考えられ、炭化物
大きさがある値までは同一硬度のマトリックスでも炭化
物の体積率の増大に伴なって耐摩耗性が向上するととも
に、スクラッチ保持性もCr量の多い、すなわち炭化物
の多い程良好であることを見い出し、本発明を完成する
に至った。Therefore, as a result of intensive research to solve the above-mentioned problems in the work roll for the front stand of a 6-high rolling mill row, the inventors of the present invention found that the wear resistance increases as the hardness increases. However, it is thought that the carbide particles contained in the material play a role in resisting wear, and up to a certain value the carbide size increases as the volume fraction of carbides increases even in a matrix of the same hardness. It has been discovered that the wear resistance is improved and the scratch retention property is also better as the amount of Cr increases, that is, as the amount of carbides increases, and the present invention was completed.
すなわち、本発明はC1,0〜1.4%、Si0.15
〜1.6%、Mn o、 15〜1.6%、Cr5〜1
6%を含み、C(!:Crとの関係が
27〈Cr%+15×C%434
Cr量、<zixc%−9
の両関係式を同時に満足する関係にあり、残部鉄および
不純物からなる耐摩耗性およびスクラッチ保持性に優れ
た6段圧延機列の前段スタンド用ワークロールを提供せ
んとするものである。That is, in the present invention, C1.0 to 1.4%, Si0.15
~1.6%, Mno, 15~1.6%, Cr5~1
The relationship with Cr is 27〈Cr%+15×C%434 Cr content, <zixc%−9, and the balance is iron and impurities. It is an object of the present invention to provide a work roll for a stand at the front stage of a six-high rolling mill row, which has excellent abrasion resistance and scratch retention.
以下、本発明をさらに具体的に説明する。なお、以下の
結果は、実圧延時のワークロール、中間ロールの転勤接
触をシミュレートしている西原式転勤摩耗試験に基づき
、30φリング片2個を転勤接触させて行なう。一方の
リング材は中間ロールとして一般に用いられる0、85
C−3,5Cr材であって、硬さHV700、表面粗
さRmax = 1.5μmのものを用いる一方、他方
のリング材は6段要な硬さ7々OO1表面粗さに−・・
=1シこ設定された種々の成分のものを用いる。The present invention will be explained in more detail below. The following results are based on the Nishihara type rolling wear test, which simulates rolling contact between work rolls and intermediate rolls during actual rolling, and are conducted by bringing two 30φ ring pieces into rolling contact. One ring material is 0.85 mm, which is generally used as an intermediate roll.
A C-3,5Cr material with a hardness of HV700 and a surface roughness of Rmax = 1.5μm is used, while the other ring material has a hardness of 7001 and a surface roughness of 6 steps.
= 1 Various components are used.
第1図はロール材中のCおよびCr含有量と表面粗さR
max(μm)および摩耗減量(■)との関係を示し、
CおよびCr含有量、特にCr含有蓋が増加するにつれ
て、表面粗さの減少が少なくなり、いわゆるスクラッチ
保持性が向上するとともに摩耗減量も少なくなり、耐摩
耗性が向上することがわかる。Figure 1 shows the C and Cr content in the roll material and the surface roughness R.
The relationship between max (μm) and wear loss (■) is shown,
It can be seen that as the C and Cr content, especially the Cr-containing lid, increases, the surface roughness decreases less, the so-called scratch retention improves, the wear loss decreases, and the wear resistance improves.
これは、CおよびCrの増加に伴い、炭化物の形成量が
多くなり、この炭化物が耐摩耗性を向上させるものと思
われる。例えば、第2図に示すように、炭化物体積率(
%)に対し上記と同様の試験条件下において5時間後の
摩耗減量(■)を求めると、炭化物体積率(%)の増加
に伴い、摩耗減量が減少し、耐摩耗性が向上することが
わかる。This is thought to be because as C and Cr increase, the amount of carbides formed increases, and these carbides improve wear resistance. For example, as shown in Fig. 2, carbide volume fraction (
%), the abrasion loss (■) after 5 hours under the same test conditions as above is determined, and it is found that as the carbide volume fraction (%) increases, the abrasion loss decreases and the wear resistance improves. Recognize.
しかしながら、CおよびCrの増加、主としてCrの増
加により第3図に示すように炭化物サイズも次第に増大
し、C0,9〜1.5%の範囲ではCr 15%で摩耗
減量が最少となり、以後Crの増加とともに増大に転す
る。また、炭化物サイズが30μmを越えると、粗大炭
化物にクラックがみられたり、炭化物が脱落して好まし
くない。However, due to the increase in C and Cr, mainly due to the increase in Cr, the carbide size gradually increases as shown in Figure 3, and in the range of C0.9 to 1.5%, the wear loss becomes the minimum at 15% Cr, and from then on It turns to increase with the increase of . Moreover, if the carbide size exceeds 30 μm, cracks may be observed in the coarse carbide or the carbide may fall off, which is not preferable.
以上の観点から、CとCrとの関係をまとめると
■ 炭化物体積率(%)からみると、炭化物体積率(%
)は12%以上必要である。この領域は第4図の直線A
より上側の領域であり、いまこの直線Aは
Cr%+15×C%−27
の関係式で表わされるから、炭化物体積率が12%以上
であるためには、
Cr%+15×C%〉27
であることが必要である。From the above points of view, the relationship between C and Cr can be summarized as follows: ■ Looking at the carbide volume fraction (%), the carbide volume fraction (%)
) is required to be 12% or more. This area is the straight line A in Figure 4.
This is the upper region, and this straight line A is expressed by the relational expression Cr%+15×C%−27, so in order for the carbide volume fraction to be 12% or more, Cr%+15×C%〉27. It is necessary that there be.
■ また、炭化物サイズからみると、炭化物サイズは3
0μm以下であることが必要である。この領域は第4図
において直線Bより下側の領域であり、いまこの直線B
は
Cr%+15×C%−34
の関係式で表わされるから、炭化物サイズが30μm以
下であるためには、
Cr%+15×C%イ34
であることが必要である。■ Also, looking at the carbide size, the carbide size is 3
It is necessary that the thickness is 0 μm or less. This area is below the straight line B in Figure 4, and now this straight line B
is expressed by the relational expression: Cr%+15×C%−34, so in order for the carbide size to be 30 μm or less, it is necessary that Cr%+15×C%−34.
■ なお、ロールの鍛造性を確保するためには、61.
4%以下であることが必要である。これは第4図におい
て直線Cの左側の領域である。■ In order to ensure the forgeability of the roll, 61.
It is necessary that it be 4% or less. This is the area to the left of straight line C in FIG.
■ また、硬さについては、高硬度程、耐摩耗性に優れ
るが、熱処理及び実用性の点からllv 800以上が
好ましく、焼入れ硬度がHv8QQ以上となる領域は第
4図の直線りより右側の領域にあり、この直線りは
Cr%=21XC%−9
の関係式で表わされるから、焼入れ硬度Hv800以上
であるためには、
Cr%=<21XC%−9
であることが必要となる。■ Regarding hardness, the higher the hardness, the better the wear resistance, but from the standpoint of heat treatment and practicality, LLv 800 or more is preferable, and the area where the quenching hardness is Hv8QQ or more is on the right side of the straight line in Figure 4. Since this straight line is expressed by the relational expression Cr%=21XC%-9, in order to have a quenching hardness of Hv800 or more, it is necessary that Cr%=<21XC%-9.
尚、本発明においては、脱酸剤として更には焼入れ住改
善元素としてSi、Mnを含有せしめるが過剰に添加す
ると脱酸生成物が増加し、鋼の清浄度lこ悪影響を及ぼ
すので、Si0.15〜1.6%、Mn 0.15〜1
.6%とする。In the present invention, Si and Mn are contained as deoxidizers and as elements for improving hardening properties, but if excessively added, deoxidation products increase and the cleanliness of the steel is adversely affected. 15-1.6%, Mn 0.15-1
.. 6%.
シタカッチ、C1,O〜1.4%、s i o、t 5
〜1.6%、Mn 0.15〜1.6%、Cr6〜16
%を含み、CとCrとが
27<cr%+15×C%と34
Cr%z21×C%−9
の両関係式を同時に満足する関係にあり、残部鉄および
不純物からなるロールはその硬度およびml岸耗性の関
係から、6段圧延機列の前段スタンド用ワークロールと
して最適である。Shitakatchi, C1, O ~ 1.4%, sio, t5
~1.6%, Mn 0.15~1.6%, Cr6~16
%, and C and Cr have a relationship that simultaneously satisfies both the following relational expressions: 27<cr%+15×C% and 34 Cr%z21×C%−9, and the roll with the remainder iron and impurities has a hardness and In terms of ml bank abrasion resistance, it is most suitable as a work roll for the front stand of a 6-high rolling mill row.
なお、その他合金元素、特にMoQ、4〜3%、Vo、
2〜2%、Ni1%以下が添加されてもよい。In addition, other alloying elements, especially MoQ, 4 to 3%, Vo,
2 to 2%, and 1% or less of Ni may be added.
実施例
下記第1表に示す成分からなる6段圧延機前段スタンド
用ワークロールを溶製し、焼入れ、焼戻し処理して試験
材の硬度11v8QQに調整し、さらに研削により表面
粗さをRmax = 12μmに調整し、一方中間ロー
ルとしテ0.85 C−3,5Cr材(硬さHV700
、表面粗さRmax = 1.5 μm)を用いて、西
原式転勤摩耗試験法により、接触面圧200に9/−と
し、エマルジョン潤滑下に、その摩耗減量を測定した。Example A work roll for the front stand of a 6-high rolling mill consisting of the components shown in Table 1 below was melted, hardened and tempered to adjust the hardness of the test material to 11v8QQ, and further ground to a surface roughness of Rmax = 12μm. 0.85 C-3,5Cr material (hardness HV700
, surface roughness Rmax = 1.5 μm), the contact surface pressure was set to 200 to 9/-, and the wear loss was measured under emulsion lubrication by the Nishihara type transfer wear test method.
すべり率は20%である。The slip rate is 20%.
その結果を第1表に示す。表中、i1〜4は本発明のワ
ークロール、x5〜11は比較例である。The results are shown in Table 1. In the table, i1-4 are work rolls of the present invention, and x5-11 are comparative examples.
第1図は硬さf(V2O3,表面粗さRmax=1.5
μmの中間ロールに対しワークロール(表面粗さRma
x=12pm1硬さHV800)のCおよびCrの含有
量を変化させたときの摩耗減量(点線)および表面粗さ
の減少(実線)との関係を示すグラフ、第2図は炭化物
体積率(%)と摩耗減量との関係を示すグラフ、第3図
はCr含有鰍(%)と炭化物サイズとの関係および相対
摩耗減量との関係を併記したグラフ、第4図はCおよび
Crについて焼入れ硬度、炭化物体積率、炭化物サイズ
および鍛造性との関係を総合的に表示したグラフで、・
印は炭化物サイズの分布を示す。
特許出願人 株式会社 神P5製鋼所
代理人弁理士青山 葆)勤”1名
第1図
第4図
in2図
第3図Figure 1 shows the hardness f (V2O3, surface roughness Rmax = 1.5
Work roll (surface roughness Rma
Figure 2 is a graph showing the relationship between wear loss (dotted line) and surface roughness reduction (solid line) when the C and Cr contents of x = 12 pm 1 (Hardness HV 800) are changed. ) and abrasion loss, Figure 3 is a graph showing the relationship between Cr content (%) and carbide size, and relative abrasion loss. Figure 4 is a graph showing the relationship between Cr content (%) and carbide size and relative abrasion loss. A graph that comprehensively displays the relationship between carbide volume fraction, carbide size, and forgeability.
Marks indicate carbide size distribution. Patent applicant Kami P5 Steel Works Co., Ltd. Patent attorney Tsutomu Aoyama (1 person) Figure 1 Figure 4 in 2 Figure 3
Claims (1)
6%、Mn 0.15〜1..6%、Cr6〜16%を
含み、CとCrとが 27くCr%+15×C%434 Cr%&21XC%−9 の両関係式を同時に満足する関係lζあり、残部鉄およ
び不純物からなることを特徴とする6段圧延機列の前段
スタンド用ワークロール。(1) C1,O~1.4%, Si 0.15~1.
6%, Mn 0.15-1. .. 6% and 6 to 16% Cr, and there is a relationship lζ in which C and Cr simultaneously satisfy both the relational expressions 27 Cr% + 15 × C% 434 Cr% & 21XC%-9, and the balance consists of iron and impurities. Features: A work roll for the front stand of a 6-high rolling mill row.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13642781A JPS5837154A (en) | 1981-08-31 | 1981-08-31 | Work roll for preceding stand of row of six-stage rolling mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13642781A JPS5837154A (en) | 1981-08-31 | 1981-08-31 | Work roll for preceding stand of row of six-stage rolling mill |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5837154A true JPS5837154A (en) | 1983-03-04 |
Family
ID=15174890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13642781A Pending JPS5837154A (en) | 1981-08-31 | 1981-08-31 | Work roll for preceding stand of row of six-stage rolling mill |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5837154A (en) |
-
1981
- 1981-08-31 JP JP13642781A patent/JPS5837154A/en active Pending
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