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1. 发明专利

JPS54112717A STEEL PRODUCTS WITH NITRATE STRESS CORROSION CRACKING RESISTANCE 失效
公开(公告)号：JPS54112717A
公开(公告)日：1979-09-03
申请号：JP1972578
申请日：1978-02-24
申请人： NIPPON STEEL CORP
发明人： SOGOU YASUO , MASUMOTO KOUKI , MURATA TOMOYOSHI , SATOU EIJI , YAMATO KAZUNARI , MITSUYOSHI YASUHIKO
IPC分类号： C22C38/00 , C22C38/26
摘要： PURPOSE:To enhance the nitrate stress corrosion cracking resistance of steel products by adding Cr>=2% to a steel together with Nb and restricting the total content of N to C and C+N =2% forms a passive state film. By restricting the total content of C and N to C+N

2. 发明专利

JPS5845320A PRODUCTION OF FINE GRAIN PRECIPITATION HARDENING TYPE STEEL MATERIAL 失效
公开(公告)号：JPS5845320A
公开(公告)日：1983-03-16
申请号：JP14485081
申请日：1981-09-14
申请人： NIPPON STEEL CORP
发明人： SATOU MAKOTO , SOGOU YASUO , MORIKAWA HIROBUMI , KAKO KATSUO , TAMUKI RIYOU
IPC分类号： C22C38/00 , B21B3/00 , B22D11/00 , C21D8/00
摘要： PURPOSE:To obtain a fine grain precipitation hardening type hard material having high strength and toughness by casting continuously low alloy steel of a specific compsn. and subjecting the steel to accelerative cooling, heating, rolling and accelerative cooling under limited conditions. CONSTITUTION:The steel contg. =1 kind among B, V, Nb, Ta, Ti, Zr, rare earth elements, Al, Ca, and if necessary, Ni, Cr, Mo, Cu, W is cast continuously. The ingot is acceleratively cooled at >=5 deg.C/min down below the Ar3 point to maintain carbonitride in a solid soln. state. The ingot is heated above the Ac3 point and is reduced down at >=5% in an unrecrystallization temp. region to a product thickness. After said rolling, the steel material is subjected to accelerative cooling. According to said method, precipitation hardening is utilized perfectly, and the fine grain precipitation hardening type steel material is obtained earily with low alloy components.

3. 发明专利

JPS59143054A High-tension steel sheet with high bendability and its manufacture 失效
标题翻译：高韧性及其制造的高强度钢板
公开(公告)号：JPS59143054A
公开(公告)日：1984-08-16
申请号：JP1509983
申请日：1983-02-01
申请人： Nippon Steel Corp
发明人： KAKO KATSUO , SOGOU YASUO , YOSHIE ATSUHIKO , ONOUE YASUMITSU
IPC分类号： C22C38/00 , C21D8/02 , C21D9/46 , C21D9/52 , C22C38/54
摘要： PURPOSE: To obtain a high-tension steel sheet with improved bendability by refining a boron steel having a specified ratio in the composition and a specified carbon equiv. and by subjecting the steel to controlled rolling combined properly with controlled cooling.
CONSTITUTION: A steel consisting of, by weight, 0.01W0.20% C, ≤1% Si, 0.5W 3% Mn, 0.0005W0.0030% B, 0.01W0.1% Al, one or more among ≤1% Ni, ≤1.5% Cr, ≤1.0% Mo, ≤1.0% Cu, 0.01W0.1% Nb, 0.01W0.1% V and 0.005W0.03% Ti, and the balance Fe with inevitable impurities and having ≥0.35% carbon equiv. represented by the equation is refined. The steel is subjected to controlled rolling at ≥20% total draft at 900°C starting temp., and it is water-cooled from ≥750°C at 0.3W3m
3 /m
2 .min flow rate of water. A high tension steel sheet with high bendability is obtd. The surface hardness (Hv) of the steel sheet is lower than the internal hardness by ≥20.
COPYRIGHT: (C)1984,JPO&Japio
摘要翻译：目的：通过精炼具有特定比例的硼钢和特定的碳当量，获得具有改善的弯曲性的高强度钢板。并通过受控制的冷却对钢进行控制轧制。构成：由重量比为0.01-0.20％C，≤1％Si，0.5-3％Mn，0.0005-0.0030％B，0.01-0.1％Al，<= 1％Ni中的一种或多种， <= 1.5％Cr，<= 1.0％Mo，<= 1.0％Cu，0.01-0.1％Nb，0.01-0.1％V和0.005-0.03％Ti，余量为Fe和不可避免的杂质，≥0.35％的碳当量。由等式表示是精炼的。钢在900℃开始温度下以> = 20％总通风压力进行控制轧制，并且以0.3-3m 3 / m 2> 水流量。具有高弯曲性的高张力钢板。钢板的表面硬度（Hv）低于内部硬度> 20。

4. 发明专利

JPS58171526A MANUFACTURE OF STEEL FOR EXTRA-LOW TEMPERATURE USE 失效
公开(公告)号：JPS58171526A
公开(公告)日：1983-10-08
申请号：JP5097282
申请日：1982-03-31
申请人： NIPPON STEEL CORP
发明人： TAMEHIRO HIROSHI , ONOUE YASUMITSU , SOGOU YASUO , KAKO KATSUO
IPC分类号： B21B3/00 , C21D8/00 , C21D8/02 , C21D9/52 , C22C38/00
摘要： PURPOSE:To obtain a steel having superior brittle cracking resistance and superior properties of stopping the propagation of brittle cracks, by treating a steel billet contg. specified percentages of C, Si, Mn, P, S, Al, Ni, Nb and N under specified rolling and cooling conditions. CONSTITUTION:A steel billet consisting of 0.005-0.08% C, =60% and the finishing temp. to 650-850 deg.C. Thus, the austenite grains are made thoroughly fine. The rolled steel is cooled to

5. 发明专利

JPS5845321A PRODUCTION OF CONTINUOUSLY CAST, ROLLED AND REFINED LOW ALLOY STEEL HAVING LESS INTERNAL DEFECTS CAUSED BY HYDROGEN 失效
公开(公告)号：JPS5845321A
公开(公告)日：1983-03-16
申请号：JP14485181
申请日：1981-09-14
申请人： NIPPON STEEL CORP
发明人： SATOU MAKOTO , SOGOU YASUO , MORIKAWA HIROBUMI , KAKO KATSUO
IPC分类号： B21B3/00 , B22D11/00 , C21D8/00 , C22C38/00
摘要： PURPOSE:To obtain rolled and refined steel of a low alloy having less internal defect caused by hydrogen by casting the molten low alloy steel of a specific compsn. continuously with a limited amt. of hydrogen therein then subjecting the steel to slow cooling, heating, rolling, quick cooling and tempering under limited conditions. CONSTITUTION:The steel contg. =1 kind among Cr, Mo, Cu, W and =5 hours below the Ar1 point and is cooled down to =5% draft in an unrecrystallization temp. region down to the Ar3 point below 900 deg.C. The rolled steel is cooled quickly down to 400 deg.C at >=1 deg.C/sec and is tempered in an early time. According to this method, the continuously cast, rolled and refined steel material having less internal defects is obtained without dehydrogenation annealing.

6. 发明专利

JPS5554549A NITRATE STRESS CORROSION CRACKING RESISTANT STEEL PRODUCT 失效
公开(公告)号：JPS5554549A
公开(公告)日：1980-04-21
申请号：JP12618278
申请日：1978-10-16
申请人： NIPPON STEEL CORP
发明人： SOGOU YASUO , MASUMOTO KOUKI , MURATA TOMOYOSHI , SATOU EIJI , YAMATO KAZUNARI , MITSUYOSHI YASUHIKO
IPC分类号： C22C38/00 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： PURPOSE:To provide a steel with superior nitrate stress corrosion cracking resistance by adding a fixed amt. of Cr to a low alloy steel in the presence of Nb and by restricting the C and N contents of the steel to below specified values. CONSTITUTION:The steel has a basic compsn. consisting of C 0.005-0.11%, Si 0.10-1.0%, Mn 0.1-2.0%, P

7. 发明专利

JPS59200722A Production of high tension thick steel plate having excellent toughness 失效
标题翻译：生产具有卓越韧性的高张力厚钢板
公开(公告)号：JPS59200722A
公开(公告)日：1984-11-14
申请号：JP7217283
申请日：1983-04-26
申请人： Nippon Steel Corp
发明人： YOSHIE ATSUHIKO , ONOUE YASUMITSU , TERASAWA TAKESHI , SOGOU YASUO
IPC分类号： B21B3/00 , C21D8/02 , C22C38/00
CPC分类号： C21D8/02
摘要： PURPOSE:To obtain a high tension thick steel plate having excellent toughness without a reheating treatment by subjecting a specifically composed steel to controlled rolling and controlled cooling after rolling under specific conditions. CONSTITUTION:A steel is composed, by weight %, of 0.1-0.25 C, 0.01-0.5 Si, 0.9-1.5 Mn, 0.02-0.1 Al, 0.002-0.008 N, 0.0003-0.002 B, =30% cumulative draft with respect to the final plate thickness in the uncrystallization temp. region in such a way that the rolling finish temp. is maintained within the temp. range of the ferrite transformation temp. or above and the ferrite transformation temp. +20 deg.C or below. The steel after the final rolling is allowed to cool or is subjected to cooling at
摘要翻译：目的：通过在特定条件下轧制后对特定组成的钢进行受控轧制和控制冷却，获得具有优异韧性的高张力厚钢板，不进行再加热处理。构成：钢的重量百分比为0.1-0.25℃，0.01-0.5Si，0.9-1.5Mn，0.02-0.1Al，0.002-0.008N，0.0003-0.002B，<0.01S，<0.03P，余量为Fe与不可避免的杂质。将这种钢加热至<= 1050℃，并在未结晶温度下相对于最终板厚度以> = 30％的累积牵伸轧制。区域以这样的方式使轧制完成温度保持在温度铁素体相变温度范围或以上铁素体相变温度。 +20℃以下。允许最终轧制后的钢冷却或在<= 5℃/秒的冷却速率下冷却至温度。铁素体相变温度范围 -60℃以上和铁素体相变温度。 -20℃或以下，并立即以15℃/秒的冷却速度冷却。

8. 发明专利

JPS5864316A TOUGHENING METHOD OF HEAT TREATED STEEL 失效
公开(公告)号：JPS5864316A
公开(公告)日：1983-04-16
申请号：JP16201781
申请日：1981-10-13
申请人： NIPPON STEEL CORP
发明人： MORIKAWA HIROBUMI , SATOU MAKOTO , KAKO KATSUO , SOGOU YASUO
IPC分类号： C21D8/00
摘要： PURPOSE:To effectively toughen heat treated steel, by rehating, working and cooling steel under the specified condition, and after that, executing heat treatment, and converting a crystal grain in a fine particle. CONSTITUTION:Steel is reheated to an Ac3 point or above, and after that, working whose cumulative working degree is >=30% is executed at =2 deg.C/sec is executed from a temperature exceeding the Ar3 point to

9. 发明专利

JPS57188615A TOUGHNESS INCREASING METHOD FOR STEEL 失效
公开(公告)号：JPS57188615A
公开(公告)日：1982-11-19
申请号：JP6852981
申请日：1981-05-07
申请人： NIPPON STEEL CORP
发明人： SOGOU YASUO , KAKO KATSUO , MORIKAWA HIROBUMI , TAKASHIMA KUNIHIDE
IPC分类号： C21D8/00 , C21D8/02
摘要： PURPOSE:To manufacture steel with high toughness at low cost by treating steel, which contains C, Si, Mn, and Al at a specific ratio, by reheating, rolling, forcible cooling, and quenching under specific conditions. CONSTITUTION:Steel which consists of 0.01-0.20% C, =30% cumulative pressure within the range of an Ar3 transformation point. Successively, forcible cooling is performed from temperature above the Ar3 point down to

10. 发明专利

JPS55148746A LOW TEMPERATURE STEEL WITH SUPERIOR BRITTLE RUPTURE RESISTANT CHARACTERISTIC AND BRITTLE CRACK STOPPING CHARACTERISTIC 失效
公开(公告)号：JPS55148746A
公开(公告)日：1980-11-19
申请号：JP5656979
申请日：1979-05-09
申请人： NIPPON STEEL CORP
发明人： SOGOU YASUO , UCHINO KOUICHI
IPC分类号： C22C38/00 , C22C38/14 , C22C38/16 , C22C38/28
摘要： PURPOSE:To provide a steel having both brittle rupture resistant characteristics and brittle crack stopping characteristics for a low temp. liquefied gas storage container by rolling a low carbon steel contg. a small amount each of P, S and N and having carbon equivalent adjusted to a specified value in a specified temp. range. CONSTITUTION:This low carbon steel contains C 0.04-0.12%, Mn 0.6-1.30%, P

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