JPH06104850B2 - Manufacturing method of crushing rod - Google Patents
Manufacturing method of crushing rodInfo
- Publication number
- JPH06104850B2 JPH06104850B2 JP63125399A JP12539988A JPH06104850B2 JP H06104850 B2 JPH06104850 B2 JP H06104850B2 JP 63125399 A JP63125399 A JP 63125399A JP 12539988 A JP12539988 A JP 12539988A JP H06104850 B2 JPH06104850 B2 JP H06104850B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- rolled material
- hardness
- surface layer
- rod
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は粉砕機に使用する粉砕媒体の製法に係わり、と
くに粉砕ロッドの製法の改良に関する。Description: TECHNICAL FIELD The present invention relates to a manufacturing method of a grinding medium used in a grinder, and more particularly to improvement of a manufacturing method of a grinding rod.
円筒型粉砕機、例えばロッドミルにおいては粉砕媒体と
しては棒状の長大寸法を有する粉砕ロッドが使用され
る。In a cylindrical pulverizer, for example, a rod mill, a rod-shaped pulverizing rod having a large size is used as a pulverizing medium.
ロッドミルは比較的粗粒からなる粉砕を多量に粉砕する
のが好適であり、ロッドミルの回転にともない粉砕ロッ
ドがロッドミル内を瀑布状の運動を繰返しながら、粉砕
ロッド相互間に挟まれた粉砕との間に激しい衝撃作用を
与えて破壊し、順次粉砕を進行させて砕製品が得られ
る。上記粉砕にともない、粉砕ロッドは摩耗を発生し、
とくに直径が大であるロッドミルによる粉砕では、粉砕
ロッドの運動がさらに活発化されることもあって、衝撃
作用も増大し摩耗の進展や曲りや折損などの損傷の発生
も著しく増大することとなり、粉砕能力が低下すること
もあって、従来、粉砕ロッドとしては、耐摩耗性および
靭性を有する高炭素鋼などの圧延材が熱処理されて使用
されていた。It is suitable for the rod mill to pulverize a large amount of pulverized particles consisting of relatively coarse particles. A crushed product is obtained by crushing by applying a violent impact in the meantime and crushing sequentially. Along with the above crushing, the crushing rod wears,
Especially in the pulverization with a rod mill having a large diameter, the movement of the pulverizing rod may be further activated, and the impact action is also increased, and the progress of wear and the occurrence of damage such as bending and breakage are significantly increased. Since the crushing ability may be reduced, conventionally, as the crushing rod, a rolled material such as high carbon steel having wear resistance and toughness is heat treated and used.
また、従来、高い焼入表面硬さが得られるようにした鋼
の焼入方法も提案されている（例えば、特開昭61−4851
4号公報参照）。Further, conventionally, a method of quenching steel for obtaining a high quenching surface hardness has also been proposed (for example, JP-A-61-4851).
(See Publication No. 4).
しかしながら、上記粉砕ロッドの製法では高炭素鋼を用
いるにさいし、炭素含有量の増加とともに焼入性も増加
して、急冷硬化によって粉砕ロッドの表面硬化が行われ
るが、焼入硬化深さが浅く、かかる表面硬化層では耐摩
耗性を呈するものの、ロッドミルの運転が長時間行わ
れ、摩耗が上記表面硬化層以上に進展すると、心部では
焼入硬化が低く、摩耗が急速に進展して充分な耐摩耗性
を発揮することができず、粉砕ロッドの総合的な耐摩耗
性を発揮することができないという問題があった。こと
に、直径が大きい粉砕ロッドを製造するさいには、急冷
硬化にさいしての質量効果によって焼入れが不完全とな
り充分な耐摩耗性が得られなくなる。また粉砕ロッドの
製法として高炭素クロム鋼を用いるさいには、高炭素ク
ロム鋼は焼入性に富んでいることもあって焼入硬化深さ
も深くなり、心部においても硬化が行われるので粉砕作
用のもとで高炭素鋼に比して耐摩耗性が向上されるが、
衝撃値をはじめとする靭性が低いため、粉砕ロッドの激
しい衝撃作用のもとで破損などの損傷をもたらし、耐久
性に劣るという問題があった。However, in the manufacturing method of the crushing rod, when using high carbon steel, the hardenability increases with the increase of the carbon content, and the surface of the crushing rod is hardened by quenching, but the quenching hardening depth is shallow. Although such a surface-hardened layer exhibits wear resistance, when the rod mill is operated for a long time and wear progresses beyond the above-mentioned surface-hardened layer, quench hardening is low in the core, and wear rapidly progresses sufficiently. However, there is a problem in that it is not possible to exert sufficient wear resistance, and it is not possible to exert the overall wear resistance of the crushing rod. In particular, when manufacturing a crushing rod having a large diameter, quenching is incomplete due to the mass effect during quench hardening, and sufficient abrasion resistance cannot be obtained. Also, when using high carbon chrome steel as a manufacturing method for the crushing rod, since high carbon chrome steel is rich in hardenability, the quench hardening depth also deepens and the core also hardens, so crushing Wear resistance is improved compared to high carbon steel under the action,
Since the toughness including the impact value is low, there is a problem that the crushing rod causes damage such as breakage under the violent impact action, resulting in poor durability.
本発明はこのような従来の問題を解決するものであり、
高炭素クロム鋼の圧延材を用い表層部を硬化させて耐摩
耗性をもたせ表層部に比して心部における硬度が低く、
かつ遷移部における硬度は表層部から心部まで傾斜して
低減されるとともに靭性を増大して傾斜機能を備え、耐
久性に優れた粉砕ロッドの製法を提供することを目的と
するものである。The present invention solves such conventional problems,
Hardness in the core is lower than that of the surface layer by hardening the surface layer using a rolled material of high carbon chrome steel to provide wear resistance,
In addition, the hardness in the transition portion is reduced by inclining from the surface layer portion to the core portion, the toughness is increased, and an inclination function is provided, and it is an object of the present invention to provide a manufacturing method of a crushing rod excellent in durability.
本発明は上記目的を達成するために、C0.5〜1.5重量
％、Si＜0.7重量％、Mn＜1.0重量％、Cr0.90〜1.60重量
％、残部Feおよび不純物の組成からなる高炭素クロム鋼
の圧延材を用いて加熱し、水焼入れ、低温焼戻してなる
粉砕ロッドの製法であって、前記圧延材を加熱し、引続
き圧延材の単位表面積m2当り４〜10m2の冷却水量および
２〜４分の冷却時間のもとで水焼入れにより急冷硬化し
たのち、低温焼戻しをし、圧延材表面からの距離が外径
のほぼ５％である表層部における硬度ＨRCは58〜63であ
り、圧延材表面からの距離が外径のほぼ50％以下である
心部における硬度ＨRCは35〜45であり、表層部から心部
にわたる遷移部における硬度は表層部から心部まで傾斜
して低減されたことを特徴とするものである。In order to achieve the above object, the present invention is a high carbon chromium having a composition of C 0.5 to 1.5% by weight, Si <0.7% by weight, Mn <1.0% by weight, Cr 0.90 to 1.60% by weight, the balance Fe and impurities. heated using the rolled material of steel, water quenching, a method of low-temperature tempering comprising grinding rod, heating the rolled material, subsequently cooling water of unit surface area m 2 per 4～10M 2 of the rolled material and 2 After quenched hardened by water quenching under to 4 minutes of cooling time, the cold tempering, the hardness H RC in the surface layer a distance from the strip surface is approximately 5% of the outer diameter is in the 58-63 The hardness H RC in the core portion whose distance from the surface of the rolled material is approximately 50% or less of the outer diameter is 35 to 45, and the hardness in the transition portion from the surface layer portion to the core portion is inclined from the surface layer portion to the core portion. It is characterized by being reduced.
〔作用〕 本発明は上記のような構成により次のような作用を有す
る。すなわち、長大寸法を有する粉砕ロッドを高炭素ク
ロム鋼の圧延材を使用して製造するさいに、圧延材を加
熱炉中で回転を与えながら移動する過程で加熱し、引続
き冷却器内を移動する過程で水焼入れされて圧延材は均
一な伝熱のもとで熱処理が行われ、しかも、水焼入れに
おける急速硬化が冷却水量および冷却時間の調製により
抑制される。そして、圧延材表面からの距離が外径のほ
ぼ５％である表層部における硬度ＨRCは58〜63であり、
圧延材表面からの距離が外径のほぼ50％以下である心部
における硬度ＨRCは35〜45であり、表層部から心部にわ
たる遷移部における硬度は表層部から心部まで傾斜して
低減されるので、表層部を硬化させて耐摩耗性をもた
せ、心部に向って硬化の抑制による硬度の低下とともに
靭性を増大して傾斜機能を備えた長大寸法を有する粉砕
ロッドを製造することができる。したがって、過酷な衝
撃作用のもとでの粉砕操作における摩耗の進展や曲りや
折損などの損傷を回避できて、耐久性、経済性を著しく
向上させることができる。[Operation] The present invention having the above-mentioned configuration has the following operation. That is, when a crushing rod having a long dimension is manufactured by using a rolled material of high carbon chrome steel, the rolled material is heated in a heating furnace in a process of moving while being rotated, and subsequently moved in a cooler. Water-quenched in the process, the rolled material is heat-treated under uniform heat transfer, and rapid hardening in water-quenching is suppressed by adjusting the amount of cooling water and the cooling time. The hardness H RC in the surface layer portion whose distance from the surface of the rolled material is approximately 5% of the outer diameter is 58 to 63,
The hardness H RC at the core where the distance from the surface of the rolled material is approximately 50% or less of the outer diameter is 35 to 45, and the hardness at the transition from the surface layer to the core decreases by inclining from the surface layer to the core. Therefore, it is possible to manufacture a crushing rod having a large size with a tilting function by hardening the surface layer portion to have wear resistance, increasing the toughness as well as decreasing the hardness due to the suppression of hardening toward the core portion. it can. Therefore, it is possible to avoid the progress of wear and damage such as bending and breakage during the crushing operation under a severe impact action, and it is possible to remarkably improve the durability and the economical efficiency.
粉砕ロッドとしてはC0.86重量％、Si0.44重量％、Mn0.5
3重量％、P0.014重量％、S0.012重量％、Cr1.35重量
％、残部Feの組成からなる直径90mm高炭素クロム鋼の圧
延材棒鋼を用い、この圧延材は、直径55〜150mmの棒鋼
を用いることができる。そして、圧延材は加熱炉中で回
転を与えながら移動する過程で、約880℃に0.5時間加熱
し、引続き、冷却器内を移動する過程で、冷却器では0.
5kg/cm2の冷却水量700〜1200l/min、冷却時間2min30sec
のもとで噴出されて粉砕ロッドが水焼入れにより急冷硬
化される。冷却器の冷却帯長は1.6mであり、粉砕ロッド
の移動速度は0.5m/minであって、冷却水量は粉砕ロッド
の単位表面積m2当り４〜10m2に相当していた。As a crushing rod, C0.86% by weight, Si0.44% by weight, Mn0.5
90% diameter high carbon chrome steel rolled material consisting of 3% by weight, P0.014% by weight, S0.012% by weight, Cr1.35% by weight, and balance Fe. This rolled material has a diameter of 55 ~ 150 mm. Of steel bars can be used. Then, the rolled material is heated to about 880 ° C. for 0.5 hours in the process of moving while being rotated in the heating furnace, and is continuously moved in the cooler at 0.
Cooling water amount of 5 kg / cm 2 700-1200 l / min, cooling time 2 min 30 sec
The crushing rod is rapidly cooled and hardened by water quenching. Cooling zone length of the cooler is 1.6 m, the moving speed of the grinding rod is a 0.5 m / min, the cooling water is corresponded to unit surface area m 2 per 4～10M 2 grinding rod.
冷却水量が単位面積当り4m2以下である場合には、粉砕
ロッドは充分な急冷硬化が行なわれず、表層部における
硬度は所要の硬度に達しない。When the amount of cooling water is 4 m 2 or less per unit area, the crushing rod does not undergo sufficient quench hardening, and the hardness of the surface layer portion does not reach the required hardness.
冷却水量が単位表面積m2当り10m2以上である場合は、粉
砕ロッドの急冷硬化が過剰となり、表層部において表面
割れなどを発生させる。したがって、冷却水量は単位表
面積m2当り４〜10m2に限定した。When the amount of cooling water is 10 m 2 or more per unit surface area m 2 , quenching and hardening of the pulverizing rod becomes excessive, causing surface cracks and the like in the surface layer portion. Therefore, the amount of cooling water is limited to 4 to 10 m 2 per unit surface area m 2 .
冷却時間が２分以下である場合、伝熱量が不充分とな
り、充分な急冷硬化が行われず、全体的に粉砕ロッドの
硬化が低下する。If the cooling time is 2 minutes or less, the amount of heat transfer becomes insufficient, sufficient quench hardening is not performed, and the hardening of the pulverizing rod is generally reduced.
冷却時間が４分以上である場合、粉砕ロッドの心部まで
焼入硬化させてしまい、心部の靭性を低下させるととも
に焼割れなどを発生させる。したがって、冷却時間は２
〜４分に限定した。When the cooling time is 4 minutes or more, the core portion of the crushing rod is quench-hardened, which lowers the toughness of the core portion and causes quenching cracks and the like. Therefore, the cooling time is 2
Limited to ~ 4 minutes.
かくして、圧延材を加熱炉中回転させながら均一な伝熱
のもとで熱処理され、しかも、水焼入れにおける冷却速
度を調整することにより、心部の硬化が行われることを
抑制している。次いで、加熱炉へ移動して210℃まで昇
温させて出炉したのち、空冷による低温焼戻しを行っ
た。Thus, the rolled material is heat-treated under uniform heat transfer while rotating in a heating furnace, and furthermore, the core is prevented from being hardened by adjusting the cooling rate in water quenching. Next, after moving to a heating furnace and raising the temperature to 210 ° C. and exiting from the furnace, low temperature tempering by air cooling was performed.
上記の工程を経て製造された粉砕ロッドの焼入硬化特性
は第１図の曲線１に示されている。すなわち、圧延材表
面からの距離が外径のほぼ５％である表層部における硬
度ＨRCは58〜63であり、圧延材表面からの距離が外径の
ほぼ50％以下である心部における硬度ＨRCは35〜45であ
り、表層部から心部にわたる遷移部における硬度は表層
部から心部まで傾斜して低減されている。The quench hardening characteristics of the crushed rod manufactured through the above steps are shown by the curve 1 in FIG. That is, the hardness H RC in the surface layer portion whose distance from the surface of the rolled material is approximately 5% of the outer diameter is 58 to 63, and the hardness in the core portion where the distance from the surface of the rolled material is approximately 50% or less of the outer diameter. H RC is 35 to 45, and the hardness in the transition portion from the surface layer portion to the core portion is reduced by inclining from the surface layer portion to the core portion.
次に比較のため、第１図の曲線２には従来の高炭素鋼に
よる粉砕ロッドの焼入硬化特性を点線により示してい
る。すなわち、焼入硬化深さが極めて薄く、また心部に
おける硬度が低くなっている。Next, for comparison, the curve 2 in FIG. 1 shows the quench-hardening characteristics of the conventional high carbon steel crush rod by a dotted line. That is, the quench hardening depth is extremely thin, and the hardness in the core is low.
第１図の曲線３には従来の高炭素クロム鋼による粉砕ロ
ッドの焼入硬化特性を鎖線により示している。すなわ
ち、表面から心部にいたるまでほぼ同様に硬化されてお
り、心部硬度もＨRC48と高く、靭性が充分でないことが
判明し得る。Curve 3 in FIG. 1 shows the quench-hardening characteristics of the conventional crushed rod made of high carbon chromium steel by a chain line. That is, it can be found that the hardness is almost the same from the surface to the core, the core hardness is as high as H RC 48, and the toughness is not sufficient.
また、得られた粉砕ロッドの機械的性質を測定し、その
結果を以下に示す。The mechanical properties of the obtained crushed rod were measured, and the results are shown below.
上記結果よりも明らかなように、粉砕ロッドの表層部は
充分な深度をもって硬化されており、心部は表層部に比
して硬度が低く、しかも表層部から心部にわたる遷移部
における硬度は表層部から心部まで傾斜して低減され
て、伸び、絞りおよび衝撃値など充分に靭性を増大して
傾斜機能を備えていることが示されている。また、得ら
れた粉砕ロッドの断面における顕微鏡組織は表層部にお
いてはマルテンサイトおよびベイナイト組織を、また、
心部においては微細パーライト組織を呈していた。 As is clear from the above results, the surface layer of the crushing rod is hardened with a sufficient depth, the core has a lower hardness than the surface layer, and the hardness at the transition from the surface layer to the core is the surface layer. It has been shown that the tongue is reduced from the core to the core to sufficiently increase the toughness such as elongation, drawing and impact value, and the tilting function is provided. Further, the microstructure in the cross section of the obtained pulverized rod is a martensite and bainite structure in the surface layer portion,
The core had a fine pearlite structure.
第２図は得られた粉砕ロッドの摩耗線図を示すものであ
る。比較のために、曲線２には従来の高炭素鋼による粉
砕ロッドの摩耗状況を示している。粉砕ロッドがロッド
ミルに使用されて硬砂岩の粉砕を行い、初期直径が長期
使用により減少する摩耗状況を示し、使用限界である40
mmに達するまで、本発明による粉砕ロッドは従来技術に
比して約４倍の耐久期間を有していることが判する。そ
して、使用限界40mm近傍においても、充分な靭性を有し
ているために、粉砕ロッドが破損されることなく、高い
耐久性をもって使用され得る。FIG. 2 shows a wear diagram of the obtained crushing rod. For comparison, curve 2 shows the wear situation of a grinding rod made of conventional high carbon steel. The grinding rod is used in a rod mill to grind hard sandstone, and the initial diameter shows a wear condition that decreases with long-term use.
It can be seen that, up to mm, the grinding rod according to the invention has a lifespan which is approximately four times longer than in the prior art. Further, even in the vicinity of the usage limit of 40 mm, since the crushing rod has sufficient toughness, it can be used with high durability without being damaged.
このように、上記実施例によれば、良好な焼入性を有す
る高炭素クロム鋼の圧延材を用い、冷却部を移動する過
程で水焼入れにおける冷却速度を含む熱処理条件などを
調整することにより、心部の硬化が行われることを抑制
しており、しかも表層部から心部にわたる遷移部におけ
る硬度は表層部から心部まで傾斜して低減されているの
で、焼入硬化深さが深く耐摩耗性に富み、かつ靭性を増
大して傾斜機能を備えた長大寸法を有する粉砕ロッドを
製造することができる。したがって、粉砕操作における
摩耗の進展や損傷の回避による耐久性、経済性を著しく
向上することができる。As described above, according to the above example, by using a rolled material of high carbon chromium steel having good hardenability, by adjusting the heat treatment conditions including the cooling rate in water quenching in the process of moving the cooling part, In addition, the hardening of the core is suppressed, and the hardness at the transition part from the surface layer to the core is reduced by inclining from the surface layer to the core. It is possible to manufacture a crushing rod having a long dimension which is rich in wear resistance and has an increased toughness and an inclined function. Therefore, it is possible to remarkably improve the durability and economical efficiency by avoiding the progress of wear and damage in the crushing operation.
本発明は上記実施例より明らかなように、高炭素クロム
鋼の圧延材を用い表層部に比して心部における硬化が抑
制されており、しかも表層部から心部にわたる遷移部に
おける硬度は表層部から心部まで低減されているので、
焼入硬化深さが深く耐摩耗性に富み、かつ靭性を増大し
て傾斜機能を備えた長大寸法を有する粉砕ロッドを製造
することができる。したがって、粉砕操作における摩耗
の進展や損傷の回避による耐久性、経済性を著しく向上
することができる。The present invention, as is clear from the above examples, using a rolled material of high carbon chromium steel, the hardening in the core is suppressed as compared with the surface layer, and the hardness in the transition portion from the surface layer to the core is the surface layer. Since it is reduced from the core to the core,
It is possible to manufacture a crushing rod having a large quench hardening depth, a high wear resistance, an increased toughness, and a long dimension with a tilt function. Therefore, it is possible to remarkably improve the durability and economical efficiency by avoiding the progress of wear and damage in the crushing operation.
第１図は本発明の一実施例における粉砕ロッドの製法に
よる粉砕ロッドの焼入硬化特性を示す説明図、第２図は
同摩耗線図であり、いずれも従来技術と比較して示して
いる。FIG. 1 is an explanatory view showing the quench-hardening characteristics of a crushing rod manufactured by a method for manufacturing a crushing rod in one embodiment of the present invention, and FIG. 2 is a wear diagram of the same, both of which are shown in comparison with the prior art. .
Claims (1)
0重量％、Cr0.90〜1.60重量％、残部Feおよび不純物か
らなる高炭素クロム鋼の圧延材を用いて加熱し、水焼入
れ、低温焼戻してなる粉砕ロッドの製法であって、前記
圧延材を加熱し、引続き圧延材の単位表面積m2当り４〜
10m2の冷却水量および２〜４分の冷却時間のもとで水焼
入れにより急冷硬化したのち、低温焼戻しをし、圧延材
表面からの距離が外径のほぼ５％である表層部における
硬度ＨRCは58〜63であり、圧延材表面からの距離が外径
のほぼ50％以下である心部における硬度ＨRCは35〜45で
あり、表層部から心部にわたる遷移部における硬度は表
層部から心部まで傾斜して低減されたことを特徴とする
粉砕ロッドの製法。1. C0.5 to 1.5% by weight, Si <0.7% by weight, Mn <1.
0% by weight, Cr 0.90 to 1.60% by weight, the remaining is a high carbon chromium steel consisting of Fe and impurities is heated using a rolled material, water quenching, low-temperature tempering method for producing a crushing rod, the rolled material 4 to 4 per unit surface area m 2 of rolled material after heating
After quenching and hardening by water quenching under a cooling water volume of 10 m 2 and a cooling time of 2 to 4 minutes, low-temperature tempering is performed, and the hardness H at the surface layer portion where the distance from the surface of the rolled material is approximately 5% of the outer diameter RC is 58 to 63, hardness H RC in the core portion where the distance from the surface of the rolled material is approximately 50% or less of the outer diameter is 35 to 45, and hardness in the transition portion from the surface layer portion to the core portion is the surface layer portion. The manufacturing method of the crushing rod, which is characterized by being inclined and reduced from the core to the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63125399A JPH06104850B2 (en) | 1988-05-23 | 1988-05-23 | Manufacturing method of crushing rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63125399A JPH06104850B2 (en) | 1988-05-23 | 1988-05-23 | Manufacturing method of crushing rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01294821A JPH01294821A (en) | 1989-11-28 |
| JPH06104850B2 true JPH06104850B2 (en) | 1994-12-21 |
Family
ID=14909171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63125399A Expired - Fee Related JPH06104850B2 (en) | 1988-05-23 | 1988-05-23 | Manufacturing method of crushing rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06104850B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467995A (en) * | 2018-03-27 | 2018-08-31 | 本钢板材股份有限公司 | Electric furnace continuous casting produces ball mill burnisher BG65Mn steel and preparation method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1008247A6 (en) * | 1994-04-18 | 1996-02-27 | Magotteaux Int | HIGH CARBON STEELS, PROCESS FOR THEIR PRODUCTION AND THEIR USE FOR WEAR PARTS MADE OF THIS STEEL. |
| CN112760563A (en) * | 2020-12-22 | 2021-05-07 | 济南厚德耐磨材料有限公司 | Method for processing wear-resistant steel bar for quartz sand rod mill |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS491424A (en) * | 1972-04-25 | 1974-01-08 | ||
| JPS5480214A (en) * | 1977-12-09 | 1979-06-26 | Hitachi Ltd | Hardening method of rolls |
| FR2428829A1 (en) * | 1978-06-16 | 1980-01-11 | Comp Generale Electricite | DEVICE FOR MEASURING THE MUTUAL COHERENCE FUNCTION OF A LASER BEAM |
| JPS552789A (en) * | 1979-04-02 | 1980-01-10 | Komatsu Ltd | Touch, wear resistant steel |
| JPS5858271A (en) * | 1981-10-02 | 1983-04-06 | Seiko Instr & Electronics Ltd | Manufacture of parts for timepiece |
| JPS6148514A (en) * | 1984-08-16 | 1986-03-10 | Komatsu Ltd | Quenching method of steel |
-
1988
- 1988-05-23 JP JP63125399A patent/JPH06104850B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108467995A (en) * | 2018-03-27 | 2018-08-31 | 本钢板材股份有限公司 | Electric furnace continuous casting produces ball mill burnisher BG65Mn steel and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01294821A (en) | 1989-11-28 |
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