JPS5835576B2 - Manufacturing method of chilled material for rolling rolls - Google Patents
Manufacturing method of chilled material for rolling rollsInfo
- Publication number
- JPS5835576B2 JPS5835576B2 JP13846079A JP13846079A JPS5835576B2 JP S5835576 B2 JPS5835576 B2 JP S5835576B2 JP 13846079 A JP13846079 A JP 13846079A JP 13846079 A JP13846079 A JP 13846079A JP S5835576 B2 JPS5835576 B2 JP S5835576B2
- Authority
- JP
- Japan
- Prior art keywords
- chilled
- rolling rolls
- content
- manufacturing
- chilled 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【発明の詳細な説明】
本発明は圧延ロールチルド材の製造法に関し、さらに詳
しくは、耐摩耗性の優れた圧延ロール用チルド材の製造
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a chilled material for a mill roll, and more particularly to a method for producing a chilled material for a mill roll having excellent wear resistance.
一般に、圧延用ロールの材質として、アングルチャンネ
ル等の型鋼圧延用仕上ロールは、硬度が低い場合に摩耗
性が劣り圧延量が少なく、硬度を上げて耐摩耗性を向上
させれば、上ロール(凹ロール)の場合はカリバー座の
円周にクラックが発生したり、また、カリバー内部に三
ケ月状のクラックが発生するという種々の問題点を有し
ている。In general, when the hardness of finishing rolls for rolling shaped steel, such as angle channels, is low, the material for rolling rolls is low, the wear resistance is poor and the amount of rolling is small.If the hardness is increased to improve the wear resistance, the top roll ( In the case of a concave roll, there are various problems such as cracks occurring on the circumference of the caliber seat and crescent-shaped cracks occurring inside the caliber.
しかして、圧延用ロールは、立吹或いは遠心力鋳造によ
ってチルド成分の溶湯を金型に鋳造し、冷却後、300
〜550℃の温度で歪取りをして製造されていた。Therefore, rolling rolls are made by casting chilled molten metal into a mold by vertical blowing or centrifugal casting, and after cooling,
It was manufactured by removing strain at a temperature of ~550°C.
そして、この圧延用ロールのチルド材では、ミクロ組織
中にセメンタイトを多量含有している上に、基地組織も
ソルバイト主体の焼戻しマルテンサイトであり、組織全
体としての靭性は、σB−60〜70kg/myj、と
小さい値であり、従って、適合する圧延スタンドに合せ
る材質も狭い範囲でしか適合せず、その個々の場合に合
うような製造法によりロールを生産したのである。In addition, the chilled material of this rolling roll contains a large amount of cementite in the microstructure, and the base structure is also tempered martensite mainly composed of sorbite, and the toughness of the entire structure is σB-60 to 70 kg/ myj, which is a small value, and therefore the material that can be matched with the applicable rolling stand is only within a narrow range, and the rolls were produced using a manufacturing method suited to each individual case.
因に、このような従来のチルド材による圧延用ロールの
ミクロ組織は第1図の顕微鏡写真で示すように、ソルバ
イトを主体に焼戻しマルテンサイトであり、950℃以
上の温度での加熱でセメンタイトの分解と黒鉛の生成に
より著しい硬度低下を招来する。Incidentally, as shown in the micrograph in Figure 1, the microstructure of conventional rolling rolls made of chilled material is mainly composed of sorbite and tempered martensite. Decomposition and the formation of graphite lead to a significant decrease in hardness.
本発明は、上記に説明した従来の圧延用ロールのチルド
材における種々の問題点を解消したものであって、耐摩
耗性に優れ、かつ、曲げ強度および硬度も高い圧延ロー
ル用チルド材の製造法である。The present invention solves the various problems with the conventional chilled materials for rolling rolls described above, and manufactures chilled materials for rolling rolls that have excellent wear resistance, high bending strength, and high hardness. It is the law.
本発明に係る圧延ロール用チルド材の製造法の特徴とす
るところは、C2,8〜3.5%、Si0.3〜0.9
%、Mn0.3−1.2%、N i 1.5〜3.5%
、Cr2.O〜5.0%、Mo0.2〜1.0%、残部
実質的にFeよりなる鋳鉄溶湯を立吹或いは遠心力鋳造
による金型鋳造によってロール形状に成形した後、95
0℃以上固相線下−50℃/ deg、まで加熱し、次
いで450o−550℃の温度範囲に急冷して保持し、
後再び7800−860℃に加熱してから冷却すること
にある。The characteristics of the manufacturing method of the chilled material for rolling rolls according to the present invention are as follows: C2.8 to 3.5%, Si0.3 to 0.9%.
%, Mn 0.3-1.2%, Ni 1.5-3.5%
, Cr2. After forming a molten cast iron consisting of O ~ 5.0%, Mo 0.2 ~ 1.0%, and the balance substantially Fe into a roll shape by vertical blowing or centrifugal casting, 95
Heating to 0°C or higher and -50°C/deg below the solidus line, then rapidly cooling and holding in a temperature range of 450°C to 550°C,
After that, it is heated again to 7800-860°C and then cooled.
以下本発明に係る圧延ロール用チルド材の製造法につい
て詳細に説明する。The method for producing a chilled material for rolling rolls according to the present invention will be described in detail below.
本発明に係る圧延ロール用チルド材の製造法において、
後述する950℃以上で固相線下−50’C/ deg
の温度に加熱する際に黒鉛化を防止するには黒鉛化促進
元素、例えば、Si、Niを低い含有量とし、黒鉛化阻
害元素、例えば、Mn。In the method for producing chilled material for rolling rolls according to the present invention,
-50'C/deg below the solidus line at 950°C or higher (described later)
In order to prevent graphitization when heated to a temperature of 1, the content of graphitization-promoting elements such as Si and Ni should be low, and the content of graphitization-inhibiting elements such as Mn should be reduced.
Cr、Mo等を高い含有量とするのがよい。It is preferable to have a high content of Cr, Mo, etc.
次に、本発明に係る圧延ロール用チルド材の製造法に使
用するチルド材の各成分と成分割合について説明する。Next, each component and component ratio of the chilled material used in the method for producing a chilled material for a roll according to the present invention will be explained.
CはSiと共にセメントタイト、黒鉛の比率を決める元
素であり、C含有量が2.8%未満ではセメンタイトの
量が少なすぎて耐摩耗性が劣り、またC含有量が3.5
%を越えるとセメンタイト量が多くなり過ぎ強靭性の低
下が著しく、さらに、高温処理の効果が少なくなる。C is an element that determines the ratio of cementite and graphite together with Si, and if the C content is less than 2.8%, the amount of cementite is too small and the wear resistance is poor;
If it exceeds %, the amount of cementite will be too large and the toughness will be significantly reduced, and furthermore, the effect of high temperature treatment will be reduced.
よって、C含有量は2.8〜3,5%の範囲とする。Therefore, the C content is set in the range of 2.8 to 3.5%.
SiはCと共にセメンタイト、黒鉛の比率を決める元素
であり、0.3%までは原料から入ってくるのであるが
、この含有量では黒鉛がなくセメンタイトだけの組織と
なり、また、Si含有量0.9饅を越えると黒鉛化作用
が大きくなり過ぎる。Si is an element that determines the ratio of cementite and graphite together with C, and up to 0.3% is introduced from the raw material, but at this content there is no graphite and there is only cementite, and the Si content is 0.3%. If the amount exceeds 9, the graphitization effect becomes too large.
よって、Si含有量は9.3〜0゜9%とする。Therefore, the Si content is set to 9.3 to 0.9%.
特に望ましいのはSi含有量0.7%以下である。Particularly desirable is a Si content of 0.7% or less.
Mnは0.3%までは原料から混入してくるものである
が、0.3%未満では脱酸作用がなく、また、C含有量
1.2%を越えるとAr1変態を遅らせるため脆弱な材
料となる。Up to 0.3% of Mn is mixed in from raw materials, but if it is less than 0.3%, it has no deoxidizing effect, and if the C content exceeds 1.2%, it delays Ar1 transformation, making it fragile. Becomes a material.
よって、Mn含有量は0.3〜1.2%の範囲とする。Therefore, the Mn content is in the range of 0.3 to 1.2%.
Niは基地の強度を増加させる元素であるが、Ni含有
量1.5%未満ではマトリクス強度を小さくし、また、
Ni含有量が3.5%を越えるとAr1変態を遅らせパ
ーライト系の材料が得にくくなる。Ni is an element that increases the strength of the matrix, but if the Ni content is less than 1.5%, the matrix strength decreases, and
If the Ni content exceeds 3.5%, Ar1 transformation will be delayed, making it difficult to obtain a pearlite-based material.
よって、Ni含有量は1.5〜3.5%とする。Therefore, the Ni content is set to 1.5 to 3.5%.
Crはその含有量が2.0%未満ではSiとの関係もあ
るが黒鉛化を防止することができず、また、5.0%を
越えて含有されるとCr炭化物の大量生成により熱処理
の効果が少なくなる。If the Cr content is less than 2.0%, graphitization cannot be prevented, although it has a relationship with Si, and if the content exceeds 5.0%, a large amount of Cr carbide will be produced, making it difficult to heat treatment. less effective.
よって、Cr含有量は2.0〜5.0%とする。Therefore, the Cr content is set to 2.0 to 5.0%.
Moは黒鉛化阻害元素であるが、その含有量が0.2%
未満ではその効果がな(,1,0%を越えて含有される
とMnの場合と同じく脆弱な材料となる。Mo is an element that inhibits graphitization, but its content is 0.2%.
If the content is less than 1.0%, the effect will not be achieved. If the content exceeds 1.0%, the material becomes brittle, as in the case of Mn.
よって、MO含有量は0.2〜1.0%の範囲とする。Therefore, the MO content is set in the range of 0.2 to 1.0%.
さらに、本発明に係る圧延ロール用チルド材の製造法に
おいて、その熱処理について説明する。Furthermore, in the method for manufacturing a chilled material for rolling rolls according to the present invention, heat treatment thereof will be explained.
上記したチルド材を950℃以上固相線下−500C/
degまで加熱すれば、セメンタイト+γの2相となり
これら2相間の拡散状況はセメンタイトの僅かの減少と
なって現われる。The above-mentioned chilled material is 950℃ or above solidus line -500C/
When heated to 100°C, two phases of cementite and γ are formed, and the state of diffusion between these two phases appears as a slight decrease in cementite.
そして、950℃未満の温度では拡散速度が小さく熱的
安定への効果が少なく、固相線下−50℃/ degを
越える温度では部分溶融が開始されるので全く別の組織
となってしまうのである。At temperatures below 950°C, the diffusion rate is low and there is little effect on thermal stability, and at temperatures above -50°C/deg below the solidus, partial melting begins, resulting in a completely different structure. be.
従って、ロールに鋳造後の加熱温度は950℃以上固相
線下−50’C/degまでとする。Therefore, the heating temperature after casting into a roll is set at 950°C or higher and -50'C/deg below the solidus line.
また、上記の加熱後に450°−550℃に冷却するの
は、残留応力の発生防止と省エネルギーのためであり、
450℃未満では降伏点の発生があり、550℃を越え
ると未変態のγが残留するからである。In addition, the reason for cooling to 450°-550°C after the above heating is to prevent the generation of residual stress and save energy.
This is because below 450°C, a yield point occurs, and above 550°C, untransformed γ remains.
この冷却は噴霧水冷で急冷する。しかし、他の冷却手段
でもよい。This cooling is done rapidly by spray water cooling. However, other cooling means may also be used.
この冷却後、7800−860℃に再加熱するのは、マ
トリクスの粒状化処理のためであり、780℃未満では
粒状化はせず、830℃の温度が最短時間で粒状化が完
了するが、860℃を越えるとマトリクスは粒状化はし
ない。After this cooling, the reason for reheating to 7800-860°C is to granulate the matrix; granulation does not occur below 780°C, and granulation is completed in the shortest time at a temperature of 830°C. Above 860°C, the matrix does not become granulated.
次に、本発明に係る圧延ロール用チルド材の製造法の実
施例を説明する。Next, an example of the method for manufacturing a chilled material for a rolling roll according to the present invention will be described.
実施例 1
370ψX500dのアングル仕上用上ロールとして、
この寸法に適合する金型に内厚55mmの外殻を遠心力
鋳造により鋳造し、凝固後芯材として球状黒鉛鋳鉄(F
CD50 )を溶着させた。Example 1 As an upper roll for angle finishing of 370ψ×500d,
An outer shell with an inner thickness of 55 mm is cast into a mold that fits these dimensions by centrifugal force casting, and after solidification, the core material is spheroidal graphite cast iron (F
CD50) was welded.
この場合、外殻の成分は、C3,01%、Si0.54
%、Mn0.68%、Ni2.45%、Cr2.23%
、Mo0.41%、残部Feである。In this case, the components of the outer shell are C3.01%, Si0.54
%, Mn0.68%, Ni2.45%, Cr2.23%
, Mo0.41%, balance Fe.
この得られたロール素材を粗加工し、両ネック部をロー
ラーで回転させながら胴部だけを1050℃に加熱し、
90分間保持後、470℃まで噴霧水冷により冷却し、
直後に830℃に加熱して10時間保持した。This obtained roll material is roughly processed, and while both neck parts are rotated by rollers, only the body part is heated to 1050 ° C.
After holding for 90 minutes, cooled to 470°C by spray water cooling,
Immediately thereafter, it was heated to 830°C and held for 10 hours.
次いで650℃まで空冷後200℃まで炉冷を行なった
。Next, it was air-cooled to 650°C and then furnace-cooled to 200°C.
その後、550℃で10時間の歪取りを行なった。Thereafter, strain relief was performed at 550° C. for 10 hours.
この時の組織は第2図に示す顕微鏡写真と同等であり、
曲げ強度82.0に9/lni、 Hs 71.5°で
あった。The structure at this time is equivalent to the micrograph shown in Figure 2,
The bending strength was 82.0 to 9/lni, and the Hs was 71.5°.
因に、本発明に係る圧延ロール用チルド材の製造法によ
り得られるチルド材の組織は第2図tこ示す顕微鏡写真
のように、マトリクスは粒状セメンタイトを生成してい
る。Incidentally, the structure of the chilled material obtained by the method for manufacturing a chilled material for rolling rolls according to the present invention is as shown in the micrograph shown in FIG. 2, in which the matrix forms granular cementite.
機械的性質も曲げ強度a B = 80〜90 kg
/i+j、Hs = 65°〜75゜である。Mechanical properties and bending strength a B = 80-90 kg
/i+j, Hs = 65° to 75°.
そして、セメンタイトの分解による黒鉛の大量生成は認
められないのは勿論である。It goes without saying that large amounts of graphite are not produced due to the decomposition of cementite.
実施例 2
ψ400X1001丸棒用ロールに適用した実施例を以
下に示す。Example 2 An example applied to a ψ400×1001 round bar roll is shown below.
外殻材として3.20%CS O,72%S i、 0
.65%Mn、2.30%Ni、2.89%Cr、0.
33%Moを含み、芯材をFCD50とした複合ロール
を鋳造した。3.20% CSO, 72% Si, 0 as outer shell material
.. 65%Mn, 2.30%Ni, 2.89%Cr, 0.
A composite roll containing 33% Mo and having a core material of FCD50 was cast.
得られた素材を粗加工は、実施例1と同じ方法で加熱し
980℃に120分間保持後450℃まで衝風冷却した
。The obtained material was roughly processed by heating in the same manner as in Example 1, held at 980°C for 120 minutes, and then cooled with blast to 450°C.
直ちに、830℃まで加熱し5時間保持後650℃まで
衝風冷却後、炉冷した。Immediately, the mixture was heated to 830°C, held for 5 hours, blast cooled to 650°C, and then cooled in a furnace.
その後、600℃で10時間の歪取を行なった。Thereafter, strain relief was performed at 600° C. for 10 hours.
このときのミクロ組織も2図と同等であり、硬度はHs
66.5°であり、曲げ強度cyB=85.6ky/m
aを示した。The microstructure at this time is also the same as in Figure 2, and the hardness is Hs
66.5°, bending strength cyB=85.6ky/m
It showed a.
以上説明したように、本発明に係る圧延ロール用チルド
材の製造法は上記の構成を有しているものであるから、
チルド材質の基地組織を強靭化し、かつ、高温処理する
ことによる耐熱安定性の向上ができ、チルド材として圧
延ロールへ適用した時耐摩耗性と耐クランク性が向上し
、従来のチルド材に比して2倍以上の圧延成績が得られ
るという効果を奏するものである。As explained above, since the method for manufacturing a chilled material for rolling rolls according to the present invention has the above configuration,
By strengthening the matrix structure of chilled materials and treating them at high temperatures, heat resistance stability can be improved.When applied to rolling rolls as chilled materials, wear resistance and crank resistance are improved, compared to conventional chilled materials. This has the effect of obtaining rolling results that are more than twice as good.
第1図は従来のチルド材の顕微鏡写真、第2図は本発明
に係る圧延ロール用チルド材の製造法により得られたチ
ルド材の顕微鏡写真である。FIG. 1 is a microscopic photograph of a conventional chilled material, and FIG. 2 is a microscopic photograph of a chilled material obtained by the method for producing a chilled material for rolling rolls according to the present invention.
Claims (1)
Mn0、3〜1.2%、Ni1.5〜3.5%、Cr2
.0〜5.0%、Mo0.2〜1.0%、残部実質的に
Feよりなる鋳鉄溶湯を立吹或いは遠心力鋳造による金
型鋳造によってロール形状に成形した後、950℃以上
固相線下−50℃/ deg、まで加熱し、次いで45
0(550℃の温度範囲に急冷して保持し後再び780
°−860℃に加熱してから冷却することを特徴とする
圧延ロール用チルド材の製造法。IC2: 8-3.5%, SiO: 3-0.9%,
Mn0, 3-1.2%, Ni1.5-3.5%, Cr2
.. After forming a molten cast iron consisting of 0 to 5.0% Mo, 0.2 to 1.0% Mo, and the balance substantially Fe into a roll shape by vertical blowing or centrifugal casting, the solidus temperature is 950°C or higher. Heat to below -50 °C/deg, then 45
0 (quickly cooled and held in the temperature range of 550°C, then cooled again to 780°C)
A method for producing a chilled material for rolling rolls, which comprises heating to -860°C and then cooling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13846079A JPS5835576B2 (en) | 1979-10-26 | 1979-10-26 | Manufacturing method of chilled material for rolling rolls |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13846079A JPS5835576B2 (en) | 1979-10-26 | 1979-10-26 | Manufacturing method of chilled material for rolling rolls |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5662924A JPS5662924A (en) | 1981-05-29 |
JPS5835576B2 true JPS5835576B2 (en) | 1983-08-03 |
Family
ID=15222534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13846079A Expired JPS5835576B2 (en) | 1979-10-26 | 1979-10-26 | Manufacturing method of chilled material for rolling rolls |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5835576B2 (en) |
-
1979
- 1979-10-26 JP JP13846079A patent/JPS5835576B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5662924A (en) | 1981-05-29 |
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