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1. 发明专利

JP2001073035A PRODUCTION OF STEEL HAVING SUPERFINE STRUCTURE 失效
公开(公告)号：JP2001073035A
公开(公告)日：2001-03-21
申请号：JP24681999
申请日：1999-08-31
申请人： NAT RES INST METALS , KAWASAKI STEEL CO , MITSUBISHI HEAVY IND LTD , JAPAN SCIENCE & TECH CORP , NIPPON STEEL CORP
发明人： TORITSUKA SHIRO , HAYASHI TORU , NAKAJIMA HIROSHI , HANAMURA TOSHIHIRO , NAGAI HISASHI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To provide a method for producing steel having a superfine structure more industrially easy to be actualized, capable of realizing as an easy process and capable of easily forming its structure into the superfine one. SOLUTION: Steel having a structure composed of ferrite of =0.7 distortion in the temp. range from the working temp. of 400 deg.C to Ael point +50 deg.C to form into steel having a superfine structure of =650 MPa tensile strength.

2. 发明专利

JP2000080435A HIGH STRENGTH P-ADDED STEEL AND ITS PRODUCTION 失效
公开(公告)号：JP2000080435A
公开(公告)日：2000-03-21
申请号：JP26095798
申请日：1998-08-31
申请人： JAPAN SCIENCE & TECH CORP , NAT RES INST METALS , NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： HANAMURA TOSHIHIRO , NAKAJIMA HIROSHI , TORITSUKA SHIRO , TSUZAKI KANEAKI , NAGAI HISASHI
IPC分类号： C21D7/13 , C21D8/00 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To solve the problem of brittleness of P and to provide a high strength steel obtained by the existence of P. SOLUTION: This steel is a carbon steel having

3. 发明专利

JP2001073034A PRODUCTION OF SUPERFINE STRUCTURE STEEL 失效
公开(公告)号：JP2001073034A
公开(公告)日：2001-03-21
申请号：JP24593699
申请日：1999-08-31
申请人： NAT RES INST METALS , MITSUBISHI HEAVY IND LTD , NIPPON STEEL CORP , JAPAN SCIENCE & TECH CORP
发明人： NAKAJIMA HIROSHI , HANAMURA TOSHIHIRO , TORITSUKA SHIRO , NAGAI HISASHI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To form a superfine structure having not more than a specified average grain diameter by repeating forging many times at the temperature of the austenitic zone or the metastable austenitic zone after heating a steel to not lower than Ac3, austenizing and thereafter executing rolling of not lower than a specified reduction of area at the temperature range between temperatures not lower than a specified temperature and not higher than Ac3. SOLUTION: Repeated forging is executed and thereafter the rolling is executed in >=70% reduction of area at the temperature range of >=550 deg.C to =30% reduction of thickness at the first forging and be in the range of 45 deg.-90 deg. of the reducing direction relative to the reducing direction just before forging at and after the second forging. A superfine structure steel plate having fine finish texture from the steel plate having >=5 mm thickness and >=10 times width of the thickness can be produced by specifying individual working conditions while continuing the forging and the rolling.

4. 发明专利

JP2000080445A OXIDE-DISPERSED STEEL AND ITS PRODUCTION 失效
公开(公告)号：JP2000080445A
公开(公告)日：2000-03-21
申请号：JP24848398
申请日：1998-09-02
申请人： NAT RES INST METALS , MITSUBISHI HEAVY IND LTD
发明人： NAKAJIMA HIROSHI , TORITSUKA SHIRO , TSUZAKI KANEAKI , NAGAI HISASHI
IPC分类号： C21C5/00 , C21C7/00 , C22C1/02 , C22C1/10 , C22C38/00 , C22C38/04 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To obtain oxide-dispersed steel capable of suppressing the growth of γ grains by finely and uniformly dispersing oxides in carbon steel in such a manner that the grain size and grain spacing are specified. SOLUTION: In carbon steel, as to oxides, the grain size is

5. 发明专利

JPH11246929A OXIDE-DISPERSED STEEL AND ITS PRODUCTION 失效
公开(公告)号：JPH11246929A
公开(公告)日：1999-09-14
申请号：JP5255698
申请日：1998-03-04
申请人： NAT RES INST METALS , MITSUBISHI HEAVY IND LTD
发明人： NAKAJIMA HIROSHI , TORITSUKA SHIRO , TSUZAKI KANEAKI , NAGAI HISASHI
IPC分类号： B22D7/00 , C21C7/00 , C22C33/04 , C22C38/00 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To suppress the coarsening of crystal grains in the heat-affected zone of a steel and to improve its toughness by uniformly dispersing fine oxide in which the particle size is specified into a steel at specified dispersion density. SOLUTION: Into a steel, the oxide having dispersion density. The dispersion density is prescribed to the range from 1000 pieces/mm capable of allowing the oxide particles to exist in a state corresponding to the size of the particles of the steel structure, i.e., the state corresponding to about 30 μm to 10000 pieces/mm corresponding to the limit in the case the possibility of aggregation is low in >=1 μm distance between the particles of the oxide. This oxide- dispersed steel is produced by arranging a molten steel in slag consisting of either or both of oxide such as SiO2 , Al2 O3 or Na2 O and fluoride such as CaF2 , supercooling them and crystallizing out the oxide from the molten steel being into a supercooled state. The supercooled state denotes the state in which the molten soln, is held to the temp. less than the m.p., and as for the supercooling degree, the 1/5 of the m.p. of the material is taken as the maximum value.

6. 发明专利

JP2000351040A SIMULTANEOUS MULTIAXIS PRESSING METHOD AND ITS DEVICE, MANUFACTURE OF SUPER FINE GRAINED FERRITIC STEEL, AND SUPER FINE GRAINED FERRITIC SLAB 失效
公开(公告)号：JP2000351040A
公开(公告)日：2000-12-19
申请号：JP16555399
申请日：1999-06-11
申请人： NAT RES INST METALS , JAPAN SCIENCE & TECH CORP , NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： HANAMURA TOSHIHIRO , NAKAJIMA HIROSHI , TORITSUKA SHIRO , NAGAI HISASHI , SAITO TADASHI , SAKUMA NOBUO
IPC分类号： B21B13/08 , B21J5/02
摘要： PROBLEM TO BE SOLVED: To provide a steel of uniform structure by simultaneously applying the distortion stress to a work in the at least three axial directions to achieve the pressing to implement the multi-axis forging in one pass without any super-large rolling mill. SOLUTION: A steel is forged by a forging device provided with an upper die 1 having a forging surface F1 with a flat lower side and a lower die 2 having V-shaped grooves 4 with forging surfaces F2 and F3 forming rectangular groove surfaces. A forging surface of triangular section is complementarily formed of the forging surfaces F1 to F3, and the multi-axis forging is possible. A forged member 3a of a round bar is inserted in the V-shaped groove 4 of inverted triangular section, and forged by simultaneously applying the distortion from three axial directions by the forging surfaces F1 to F3. The stress is applied to the work 3a perpendicularly from the forging surfaces F1 to F3. The work formed in the inverted triangular section copying the V-shaped groove 4 is drawn out of the V-shaped groove 4, and rotated by 60 deg. around the axis to form a normal triangular posture, and forged again. The local lattice rotation of the work 3 is facilitated to easily realize the fine structure of the material.

7. 发明专利

JP2000239781A THICK-WALLED STEEL PRODUCT EXCELLENT IN WELDABILITY, AND ITS MANUFACTURE 失效
公开(公告)号：JP2000239781A
公开(公告)日：2000-09-05
申请号：JP4896299
申请日：1999-02-25
申请人： NAT RES INST METALS , MITSUBISHI HEAVY IND LTD
发明人： NAKAJIMA HIROSHI , TORITSUKA SHIRO , TSUZAKI KANEAKI , NAGAI HISASHI
IPC分类号： C21D8/00 , C21D8/06 , C22C1/10 , C22C32/00 , C22C33/04 , C22C38/00 , C22C38/04 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To manufacture a thick-walled steel product having a diameter or shorter-side length of specific size and improved in weldability as well as in strength and toughness to a greater extent by uniformly dispersing oxides of specific grain size in specific dispersion density and forming uniform ferrite grains of specific grain size in the whole of the plane at right angles to rolling direction. SOLUTION: Oxides of =2 elements among Ti, Mg, and Al as oxide-forming elements, and the balance Fe with inevitable impurities and also has excellent weldability and >=5 mm diameter or shorter-side length.

8. 发明专利

JP2001004508A WORKING HEAT TREATMENT REPRODUCING TEST APPARATUS 失效
公开(公告)号：JP2001004508A
公开(公告)日：2001-01-12
申请号：JP17991499
申请日：1999-06-25
申请人： NAT RES INST METALS , FUJI ELECTRONIC IND
发明人： TORITSUKA SHIRO , NAGAI HISASHI , IKEDA MAMORU , WADA KUNIHIRO
IPC分类号： G01N1/28 , G01N3/00
摘要： PROBLEM TO BE SOLVED: To obtain a working heat treatment reproducing test apparatus enabling not only the rotation of a test piece at a predetermined angle but also the movement thereof to a predetermined position, capable of independently controlling the temp. of the test piece and that of a working device and capable of compensating the uniform heating of a mechanical test piece. SOLUTION: A working heat treatment reproducing test apparatus for working a metal test piece 1 in a heat treatment process is equipped with test piece intermittent rotation mechanisms 5, 5' having actuators 14, 14' grasping working devices 11, 11' at the positions opposed to each other to hold the test piece 1 arranged therebetween and holding the test piece with the rotary shafts crossing a working shafts at a right angle to intermittently stop the same and a high frequency induction heating power supply 21 and a direct current supply heating power supply 26 both of which control the heating of the working devices 11, 11' and the test piece 1 by a plurality of heating sources.

9. 发明专利

JPH1192860A STEEL HAVING ULTRAFINE FERRITIC STRUCTURE 失效
公开(公告)号：JPH1192860A
公开(公告)日：1999-04-06
申请号：JP25648397
申请日：1997-09-22
申请人： NAT RES INST METALS , KAWASAKI STEEL CO
发明人： HAYASHI TORU , TORITSUKA SHIRO , TSUZAKI KANEAKI , NAGAI HISASHI
IPC分类号： C22C38/00 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To obtain a steel having an ultrafine ferritic structure and furthermore having excellent characteristics of a remarkably long service life by composing a steel having a martensitic structure of the one essentially consisting of ferrite subjected to strain induced recrystallization after heating to a specified temp. range and regulating the average ferrite grain size to a specified value or below. SOLUTION: A steel is heated to the temp. range of the Ac3 to 1350 deg.C, and, after working in an austenitic region or as-nonworked, rapid cooling is executed so as to regulate its structure after the cooling to martensite. This steel is reheated to from 500 deg.C to the Ac1 , is thereafter held for 1 to 1000 sec, is directly subjected to >=50% working, is held at the temp. for >=10 sec and is cooled to obtain the steel having

10. 发明专利

JPH1192855A STEEL HAVING ULTRAFINE DOUBLE PHASE STRUCTURE 失效
公开(公告)号：JPH1192855A
公开(公告)日：1999-04-06
申请号：JP25680297
申请日：1997-09-22
申请人： NAT RES INST METALS
发明人： TSUZAKI KANEAKI , TORITSUKA SHIRO , NAGAI HISASHI
IPC分类号： C22C38/00 , C22C38/18
摘要： PROBLEM TO BE SOLVED: To increase the strength of a ferritic steel and to improve the balance of the strength and ductility by providing the steel with an ultrafine double phase structure in which the average grain size is regulated to a specified value or below, the ferrite surrounded with a large-angle grain boundary whose orientation difference angle in the grain boundary is regulated to a specified value or above is used as the mother phase and the pearlite of a specified ratio or above is incorporated. SOLUTION: In this structure, the average grain size is =15 deg. is used as the mother phase and the pearlite of >=3 vol.% is incorporated. For the ultrafining and the enlargement of the angle of the grains, anvil compression working is extremely effective, and intensive working of >90% reduction of area per pass is also possible. The worked part is applied with large deformation including shear deformation compared to the case by roll rolling even at the same reduction of area, so that, by executing the anvil compression working in an unrecrystallized region, the objective ferritic grains can be obtd. by the working of >=50% reduction of area. Thus, by regulating the austenitic grain size, the amt. to be worked and the working temp., the objective steel can be obtd.

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