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1. 发明专利

JPH06192791A WORKING ROLL FOR MULTISTAGE ROLLING AND ITS PRODUCTION 失效
公开(公告)号：JPH06192791A
公开(公告)日：1994-07-12
申请号：JP34689792
申请日：1992-12-25
申请人： HITACHI LTD , HITACHI MATERIAL ENG KK
发明人： ERA MASAYUKI , UCHIDA TETSUO , KONDO YASUO , YASUDA TAKESHI , SHIMOTAMURA OSAMU , KIKUHARA TAKASHI
IPC分类号： B21B27/00 , C21D9/38 , C22C38/00 , C22C38/52
摘要： PURPOSE:To provide a hardened roll for a multistage rolling mill having high hardness and high wear resistance and excellent in dimple resistance by means of high temp. tempering. CONSTITUTION:The working roll for multistage rolling mill is composed of a high alloy steel having a composition consisting of, by weight, 2.45-4% C, 1-2.5% Si, 0.6-2% Mn, 0.3-1.5% Ni, 6-8% Cr, >11-15% Mo, 10-20% W, 5-10% V, 12-16% Co, and the balance essentially Fe and is formed by performing hardening and tempering. By this method, the hardness of this roll is regulated to >=HRC68 and increased by >=HRC2 as compared with conventional high V-high speed tool steel and high Mo-high Co high speed tool steel, and further, wear resistance and dimple resistance can be improved by >=2 folds and i1.3 folde respectively.

2. 发明授权

US3929471A High speed steel having high wear-resistance 失效
标题翻译：具有高耐磨性的高速钢
公开(公告)号：US3929471A
公开(公告)日：1975-12-30
申请号：US31689772
申请日：1972-12-20
申请人： HITACHI LTD
发明人： AKAHORI KIMIHIKO , ERA MASAYUKI
IPC分类号： C22C38/00 , C22C38/12 , C22C38/24 , C22C38/36
CPC分类号： C22C38/12
摘要： A high speed steel having high wear-resistance having a ferrous matrix consisting essentially of iron and containing 0.2-0.6 wt.% combined carbon, in which said matrix has crystallized therein a carbide which is formed by the combination of 5-12 wt. % of vanadium and 3-10 wt. % of niobium with an amount of carbon just enough for combination therewith.
摘要翻译：具有高耐磨性的高速钢具有基本上由铁组成并含有0.2-0.6重量％的组合碳的铁基体，其中所述基体在其中结晶的碳化物是通过5-12重量％的组合形成的。％的钒和3-10wt。具有碳量的铌的百分比刚刚足以与其组合。

3. 发明授权

US3929518A High speed steel having high wear resistance 失效
标题翻译：高速钢具有高耐磨性
公开(公告)号：US3929518A
公开(公告)日：1975-12-30
申请号：US43595274
申请日：1974-01-23
申请人： HITACHI LTD
发明人： AKAHORI KIMIHIKO , ERA MASAYUKI
IPC分类号： C22C38/00 , C22C38/12 , C22C38/36
CPC分类号： C22C38/12 , C22C38/36
摘要： A high speed steel having high wear resistance consisting essentially of 3.1 to 6.3% by weight of carbon, 5 to 12% by weight of vanadium, 3 to 10% by weight of niobium, and the balance substantially iron, wherein all of vanadium and niobium reacts with carbon, 1.4 to 3.6% by weight of carbon forms cementite and 0.1 to 0.6% by weight of carbon dissolves in a ferrous matrix as hardened.
摘要翻译：具有高耐磨性的高速钢基本上由碳组成为3.1〜6.3重量％，钒为5〜12重量％，铌为3〜10重量％，余量基本上为铁，其中全部为钒和铌与碳反应，1.4至3.6重量％的碳形成渗碳体和0.1至0.6重量％的碳溶解在铁基体中硬化。

4. 发明专利

JPH0483853A ROLL FOR ROLLING MILL 失效
公开(公告)号：JPH0483853A
公开(公告)日：1992-03-17
申请号：JP19700890
申请日：1990-07-25
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KODAMA HIDEYO , KONDO YASUO , UCHIDA TETSUO , SHIMOTAMURA OSAMU , SHIMIZU MASAMI
IPC分类号： B21B27/00 , C22C38/00 , C22C38/54
摘要： PURPOSE:To obtain a roll for rolling mill having high hardness and combining thermal shock resistance, spalling resistance, and wear resistance by specifying a composition consisting of C, Si, Mn, Ni, Cr, Mo, W, V, Zr, B, Co, and Fe. CONSTITUTION:An ingot of a steel having a composition which consists of, by weight, 0.6-0.9% C, 1-2% Si, 1.2-2.5% Mn, 0.8-2.5% Ni, 5.5-7.5% Cr, 2-5% Mo, 1-5% W, 0.5-4% V, =0.05% B, 0.5-5% Co, and the balance Fe with inevitable impurities and in which Mo/W is regulated to 0.4-5 is subjected to diffusion annealing at 1150-1200 deg.C and then to hot constrained forging at 1050-1175 deg.C. The resulting forged product is subjected to stress relief annealing, to hardening at 975-1200 deg.C, and then to a repetition of high temp. tempering at 470-650 deg.C three or more times. Subsequently, the above product is machined and inspected, by which the roll for rolling mill excellent in various properties can be obtained.

5. 发明专利

JPS63290221A CONJUGATED ROLL 失效
公开(公告)号：JPS63290221A
公开(公告)日：1988-11-28
申请号：JP12384587
申请日：1987-05-22
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KONDO YASUO , SHIMOTAMURA OSAMU
IPC分类号： B22D19/00 , B21B27/00 , C21D9/38
摘要： PURPOSE:To provide a conjugated roll combining high hardness with wear resistance, by applying the building-up of nickel chromium-type cast iron to the outside periphery of the steel core material of a roll and by subjecting the above to hardening at a specific temp. and then to high-temp. tempering treatment. CONSTITUTION:The overlay welding of a nickel chromium-type cast-iron material is applied to the outside periphery of a steel core material by an electroslag remelting process, which is used as an outer layer to form a conjugated roll. Subsequently, this conjugated roll is hardened at 950-1,150 deg.C, heated and held at a high-temp. tempering temp. of 475-525 deg.C for about 1-10hr, and successively subjected to rapid cooling, slow cooling, and subzero cooling. By this method, the conjugated roll having a high hardness of >=about 91 Shore hardness and wear resistance can be obtained.

6. 发明专利

JPS62254953A TWIN ROLL TYPE CONTINUOUS CASTER 失效
公开(公告)号：JPS62254953A
公开(公告)日：1987-11-06
申请号：JP9796786
申请日：1986-04-30
申请人： HITACHI LTD , NISSHIN STEEL CO LTD
发明人： AIZAWA TATSUSHI , ERA MASAYUKI , KIMURA TOMOAKI , NISHINO TADASHI , HASEGAWA MORIHIRO , YAMAUCHI TAKASHI
IPC分类号： B22D11/06
摘要： PURPOSE:To obtain a sheet metal having excellent surface quality without any defects, such as dent, casting wrinkle, hair crack, etc., by arranging the unevenness having the specific depth on a roll surface for twin roll type continuous caster. CONSTITUTION:In case of casting the sheet metal having 1-20mm thickness by the twin roll type continuous caster, the unevenness having 10-200mu depth is arranged on the surface 2 of the roll 1. In this way, the solidified layer developed as bringing into contact with the roll surface is restricted by the uneven roll surface and as the shrinkage according to temp. drop in the solidified layer is occurred among the uneven surface, development of the dent, casting wrinkle, hair crack, etc., is prevented.

7. 发明专利

JPS5757862A Rolling roll material 失效
标题翻译：滚动材料
公开(公告)号：JPS5757862A
公开(公告)日：1982-04-07
申请号：JP13068680
申请日：1980-09-22
申请人： Hitachi Ltd
发明人： ERA MASAYUKI , AKAHORI KIMIHIKO
IPC分类号： B21B27/00 , B21B27/02 , C22C38/00 , C22C38/26
摘要： PURPOSE: To obtain a rolling roll material with enhanced toughness and thermal impact resistance by adding a restricted amount of Si and Nb in place of Co in the composition of a high-speed tool steel.
CONSTITUTION: This rolling roll material consists of, by wt., 1.2W1.6% C, 0.5W 2.5% Si, ≤0.6% Mn, 3.0W5.0% Cr, 3.0W5.0% Mo, 3.0W5.0% V, 1.0W2.5% W, 1.0W 2.5% Nb and the balance Fe with impurities. This composition is obtd. by reducing the Cr, Mo and W contents of steel and adding such a restricted amount of Si and Nb in place of conventionally added Co. By this steel composition the rolling roll material has high wear resistance, high toughness and superior thermal impact resistance.
COPYRIGHT: (C)1982,JPO&Japio
摘要翻译：目的：通过在高速工具钢的组成中添加限制量的Si和Nb代替Co，获得具有增强的韧性和耐热冲击性的轧制辊材料。构成：该轧制辊材料由重量计为1.2-1.6％C，0.5-2.5％Si，<= 0.6％Mn，3.0-5.0％Cr，3.0-5.0％Mo，3.0-5.0％V，1.0 -2.5％W，1.0-2.5％Nb，余量为Fe与杂质。这个组合是有限的。通过降低钢的Cr，Mo和W含量，并添加限制量的Si和Nb代替常规添加的Co。通过该钢组合物，轧辊材料具有高耐磨性，高韧性和优异的耐热冲击性。

8. 发明专利

JPS5575808A COLD ROLLING MILL 失效
公开(公告)号：JPS5575808A
公开(公告)日：1980-06-07
申请号：JP14790578
申请日：1978-12-01
申请人： HITACHI LTD
发明人： ERA MASAYUKI , AKAHORI KIMIHIKO
IPC分类号： B21B13/14 , B21B27/00 , C22C38/00 , C22C38/24 , C22C38/34 , C22C38/36
摘要： PURPOSE:To prevent the surface roughening, etc., due to the transference from the work roll, and to extend the life of the backup roll, by making at least one of backup rolls of the cold rolling mill provided with the dull faced work rolls of the tool steel containing a specified amount of C, V. CONSTITUTION:At least of backup rolls, preferably the first intermediate backup roll, of the cold rolling mill provided with the dull faced work rolls and the backup rolls to backup these work rolls, is made of the tool steel containing 0.7-2wt%C, and 1-5wt%V. By containing not less than 0.7%C, a part of C is dissolved into the base metal, and the residual C combines with Cr, Mo, W, V, forming the hard carbide which improves the abrasion resistance. Accordingly, 1-5wt%V is necessary, and the carbon content 2wt% is required to obtain the good VC carbide structure.

9. 发明专利

JPH05132738A HARDENED ROLL FOR ROLLING AND ITS PRODUCTION 失效
公开(公告)号：JPH05132738A
公开(公告)日：1993-05-28
申请号：JP29714891
申请日：1991-11-13
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KODAMA HIDEYO , KONDO YASUO , UCHIDA TETSUO , SHIMOTAMURA OSAMU
IPC分类号： B21B27/00 , C21D9/38 , C22C38/00 , C22C38/46
摘要： PURPOSE:To provide a hardened roll for rolling having high hardness, excellent in wear resistance, accident resistance (toughness), and corrosion resistance, and having superior hardenability. CONSTITUTION:The hardened roll for rolling is constituted of an alloy steel having a composition consisting of, by weight, 0.7-1.4% C, 0.8-2.5% Si, 0.8-2.5% Mn, 0.5-2.5% Ni, 2.5-6.5& Cr, 2.5-8,5% Mo, 0.3-3.0% W, 0.5-4.5% V, and the balance essentially Fe. Further, the roll contains >15-40% retained austenite due to tempering after subzero treatment and has >=Hs80 hardness. Moreover, one or more kinds among

10. 发明专利

JPH01240635A WORK ROLL FOR ROLLING AND ITS MANUFACTURE 失效
公开(公告)号：JPH01240635A
公开(公告)日：1989-09-26
申请号：JP6778488
申请日：1988-03-22
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KONDO YASUO , KODAMA HIDEYO , SHIMOTAMURA OSAMU
IPC分类号： C21C1/08 , B21B27/00 , B22D23/10 , C22C37/00 , C22C37/06
摘要： PURPOSE:To obtain a work roll for rolling having wear resistance and high brightness by forming an outer layer member of high C and high Cr cast iron to the outside of a core made of steel by an electroslag remelting method and thereafter subjecting it to heat treatment. CONSTITUTION:A cylindrical consumption electrode 14 of cast iron constituted of, by weight, 2.5-3.5% C, 1-3% Si, 1-3% Mn, 12-25% Cr, 1-3% Mo, 1-3% W, 1-3% V and the balance consisting substantially of iron is disposed between a core 13 made of steel and a water-cooled mold 18. Flux is added to the tip of the electrode 14; an arc is generated between the electrode 14 and a starting stand 16 by electric power from the electric power source 21 to generate molten slag 19; and the outer circumferential part of the core 13 and said electrode 14 are melted to form a molten metal 20. Accompanied with the rise of the molten metal 20, said mold 18 is risen and the above metal 20 is successively solidified while revolving a solid surface plate 15 to form an outer layer member 11, and after preparing a composite roll material, specific heat treatment is executed thereto. By this method, the above roll having no faults on the welding boundary part 12 and having wear resistance and high brightness can be obtd.

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