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21. 发明申请

WO1996004086A1 CONTINUOUS CASTING METHOD FOR THIN CAST PIECE AND APPARATUS THEREFOR 审中-公开
标题翻译：连铸铸造方法及其设备
公开(公告)号：WO1996004086A1
公开(公告)日：1996-02-15
申请号：PCT/JP1995001504
申请日：1995-07-27
申请人： SUMITOMO METAL INDUSTRIES, LTD. , TAKEUCHI, Isamu , YAMANAKA, Akihiro , OKAMURA, Kazuo , SIMIZU, Hiroyasu , KANAZAWA, Takasi , KUMAKURA, Seiji , KOIDE, Masakuza , MURAKAMI, Toshihiko , WATANABE, Tadao
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： B22D11/128
CPC分类号： B22D11/1206
摘要： The invention relates to a continuous casting method and a continuous casting apparatus, in which a non-solidifying cast piece is appropriately subjected to rolling by rolls while being continuously drawn by support rolls. According to this method, a non-solidifying rolling strain and a bulging strain are reduced whereby a total accumulated strain is suppressed to be made small, and thin cast pieces free of internal crack can be manufactured even in non-solidifying rolling under the condition of high speed casting. In the apparatus, a misalignment strain is suppressed and non-solidifying rolling of cast pieces is easily performed, and modification to thickness of cast pieces can be carried out without stopping the apparatus during operation.
摘要翻译：本发明涉及一种连续铸造方法和连续铸造装置，其中非固化铸件在被支撑辊连续拉伸的同时适当地经过辊轧。根据该方法，由于非固化轧制应变和膨胀应变降低，总累积应变被抑制得较小，即使在非固化轧制中也能够制造没有内部裂纹的薄铸件，条件是高速铸造。在该装置中，不对准应变被抑制，并且易于进行铸件的非固化轧制，并且可以在操作期间不停止该装置来进行铸件厚度的修改。

22. 发明申请

WO1993024252A1 METHOD OF COLD ROLLING METAL STRIP MATERIAL 审中-公开
标题翻译：冷轧金属条材料的方法
公开(公告)号：WO1993024252A1
公开(公告)日：1993-12-09
申请号：PCT/JP1992001497
申请日：1992-11-16
申请人： SUMITOMO METAL INDUSTRIES, LTD. , MITSUBISHI JUKOGYO KABUSHIKI KAISHA , TOMIZAWA, Atsushi , YAMAMOTO, Hideo , MASUI, Takeshi , HORI, Kiyotaka , HAMADA, Ryuji , KAMATA, Shunji , KANEKO, Toru , MATSUDA, Yutaka , HORIE, Kazuhiko , NAKANA, Tsuneo , HASHIMOTO, Shoichi , FURUMOTO, Hideaki
发明人： SUMITOMO METAL INDUSTRIES, LTD. , MITSUBISHI JUKOGYO KABUSHIKI KAISHA
IPC分类号： B21B01/22
CPC分类号： B21B1/22 , B21B13/023
摘要： When a metal strip material is cold rolled, roll cross rolling and roll parallel rolling are combined, and rolling is carried out by the roll parallel rolling system at at least the final stand (in the case of a tandem mill) or in at least the final pass (in the case of a single-stand mill such as reverse mill) to obtain a rolled metal strip free from torsion and having excellent luster. In some cases, preliminary cold rolling of a rolling reduction of at least 5 % is in advance applied to a metal strip material by the roll cross system, and then cold rolling by the combination of roll parallel rolling or roll cross rolling and roll parallel rolling is carried out.
摘要翻译：当将金属带材料进行冷轧时，将轧制横轧和轧辊平行轧制组合在一起，并且至少在最终机架（在串列式轧机的情况下）通过轧辊平行轧制系统进行轧制，或至少在最终通过（在单轧机如反向磨机的情况下），以获得没有扭转并具有优异光泽的轧制金属带。在某些情况下，轧制交叉系统预先将轧制压下率至少为5％的预冷轧施加到金属带材上，然后通过轧辊平行轧制或轧辊交叉轧制和辊平行轧制的组合进行冷轧完成了。

23. 发明申请

WO1997049845A1 CRYSTAL-GROWING METHOD AND SOLID ELEMENT AND DEVICE FOR CRYSTAL GROWTH USED IN THE METHOD 审中-公开
标题翻译：晶体生长方法和固体元素和方法用于晶体生长
公开(公告)号：WO1997049845A1
公开(公告)日：1997-12-31
申请号：PCT/JP1997002169
申请日：1997-06-23
申请人： SUMITOMO METAL INDUSTRIES, LTD. , SANJOH, Akira
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： C30B29/58
CPC分类号： C30B7/00 , C30B29/58 , Y10T117/1024
摘要： A method for accelerating the crystallization of biopolymers such as a protein. A crystalline silicon element (70) controlled in the valence electrons in such a way that the concentration of holes or electrons present on the surface can be controlled in accordance with the conditions of a buffer solution (72) containing a biopolymer such as a protein is brought into contact with the solution (72) to thereby crystallize the biopolymer on the surface of the element (70); a plurality of grooves or hollows different in size are formed on the element (70) and the valence electrons are controlled in such a way that the crystallization of the biopolymer in the grooves or hollows can be conducted more rapidly than in the outside of them; and the crystals of the biopolymer grow in the grooves or hollows in contact with the solution (72).
摘要翻译：一种促进生物聚合物如蛋白质结晶的方法。控制价电子的晶体硅元件（70）以这样一种方式可以根据包含生物聚合物如蛋白质的缓冲溶液（72）的条件来控制存在于表面上的空穴或电子的浓度，与溶液（72）接触，从而使生物聚合物在元件（70）的表面上结晶; 在元件（70）上形成尺寸不同的多个凹槽或凹槽，并且价电子以这样的方式进行控制，使得生物聚合物在凹槽或凹槽中的结晶可以比其外部更快地进行; 并且生物聚合物的晶体在与溶液（72）接触的凹槽或凹槽中生长。

24. 发明申请

WO1997048830A1 HIGH-CHROMIUM AND HIGH-NICKEL ALLOY WITH HYDROGEN SULFIDE CORROSION RESISTANCE 审中-公开
标题翻译：高铬和高镍合金与氢硫化物耐腐蚀性
公开(公告)号：WO1997048830A1
公开(公告)日：1997-12-24
申请号：PCT/JP1996001672
申请日：1996-06-17
申请人： SUMITOMO METAL INDUSTRIES, LTD. , UEDA, Masakatsu
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： C22C38/00
CPC分类号： C22C38/42
摘要： A high-chromium and high-nickel alloy having the following chemical composition and being excellent in hydrogen sulfide corrosion resistance under the conditions of a partial pressure of hydrogen sulfide gas of about 1 atm or less and a temperature of about 150 DEG C. As the alloy does not contain any expensive elements such as Mo and W, it is inexpensive and can be mass-produced. Si: 0.05-1.0 % (by weight, the same applies hereinbelow); Mn: 0.1-1.5 %; Cr: 20-30 %; Ni: 20-40 %; sol. Al: 0.01-0.3 %; Cu: 0.5-5.0 %; REM: 0-0.10 % Y: 0-0.20 %; Mg: 0-0.10 %; Ca: 0-0.10 %; balance: Fe and inevitable impurities. The content of each of C, P and S in the inevitable impurities is respectively at most 0.05 %, at most 0.03 % and at most 0.01 %. As shown in the above composition, REM, Y, Mg and Ca need not be added, while, if necessary, at least one of them is added preferably in the range of 0.001-0.10 % REM, 0.001-0.20 % Y, 0.001-0.10 % Mg, and 0.001-0.10 % Ca.
摘要翻译：在硫酸氢气分压约1atm以下，温度约150℃的条件下，具有以下化学成分和耐硫化氢腐蚀性优异的高铬和高镍合金。作为合金不含任何昂贵的元素如Mo和W，它便宜并且可以批量生产。 Si：0.05〜1.0％（重量份，以下相同）; Mn：0.1〜1.5％ Cr：20-30％; Ni：20-40％; 溶胶。 Al：0.01-0.3％; Cu：0.5-5.0％; REM：0-0.10％Y：0-0.20％; Mg：0-0.10％; Ca：0-0.10％; 余量：铁和不可避免的杂质。不可避免的杂质中C，P和S中的每一种的含量分别为0.05％以下，0.03％以下0.01％以下。如上述组成所示，不需要添加REM，Y，Mg和Ca，如果需要，其中至少一种的添加量优选为0.001-0.10％REM，0.001-0.20％Y，0.001- 0.10％Mg和0.001-0.10％Ca.

25. 发明申请

WO1997046733A1 SURFACE-TREATED STEEL SHEET EXCELLENT IN CORROSION RESISTANCE AFTER WORKING 审中-公开
标题翻译：工作后耐腐蚀性能好的表面处理钢板
公开(公告)号：WO1997046733A1
公开(公告)日：1997-12-11
申请号：PCT/JP1996001537
申请日：1996-06-06
申请人： SUMITOMO METAL INDUSTRIES, LTD. , NAGAI, Hiroyuki , KAWANISHI, Yoshihiro , KAJIYAMA, Eiji , KASHIWAGI, Hiroyuki , TSUCHIYA, Shinichi
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： C23C28/00
CPC分类号： C23C28/3225 , C23C22/24 , C23C22/30 , C23C28/00 , C23C28/345 , C25D3/565 , C25D11/38 , Y10S428/935 , Y10T428/12493 , Y10T428/12569 , Y10T428/12611 , Y10T428/12799 , Y10T428/249923
摘要： Object: to develop a material which can be improved in the resistance to corrosion caused by alcoholic fuels after working without detriment to the weldability and without any substantial cost increase. Constitution: a chromate coating is formed on Zn-X-alloy electroplated steel sheets (wherein X is at least one element selected among 3-18 wt.% Ni, 0.02-3 wt.% Co, 25-45 wt.% Mn, and 8-20 wt.% Cr). The crack density of the Zn-X-alloy coating present under the chromate coating is 1,000-150,000/mm in terms of the spot surrounded by the cracks, among which cracks having the maximum width of 0.5 mu m or less account for at least 90 % and cracks whose depths are at least 80 % of the coating thickness account for at least 80 %.
摘要翻译：目的：开发可以改善在工作后由酒精燃料引起的耐腐蚀性的材料，而不损害可焊性并且没有任何显着的成本增加。结构：在Zn-X合金电镀钢板上形成铬酸盐涂层（其中X是选自3-18重量％的Ni，0.02-3重量％的Co，25-45重量％的Mn中的至少一种元素，和8-20重量％的Cr）。存在于铬酸盐涂层下的Zn-X合金涂层的裂纹密度在由裂纹包围的点上为1,000-150,000 / mm 2，其中最大宽度为0.5μm或更小的裂纹占至少90％，并且其深度至少为涂层厚度的80％的裂纹至少为80％。

26. 发明申请

WO1997031131A1 GALVANNEALED SHEET STEEL AND PROCESS FOR PRODUCING THE SAME 审中-公开
标题翻译： GALVANNEALED SHEET STEEL AND PROCESS FOR PRODUCTING THE SAME
公开(公告)号：WO1997031131A1
公开(公告)日：1997-08-28
申请号：PCT/JP1997000510
申请日：1997-02-21
申请人： SUMITOMO METAL INDUSTRIES, LTD. , HORI, Masahiko , NAKAMORI, Toshio , MIKI, Keiji
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： C23C02/06
CPC分类号： C23C2/02 , C23C2/28 , C23C2/40 , Y10S428/939 , Y10T428/12799
摘要： A galvannealed sheet steel suitably used as a steel plate for automobiles, and a process for producing the same. This steel plate has a high powdering resistance during press working, and a high chipping resistance in a cold district. This method is also suitable for the production of a steel plate of a high tensile strength. The galvannealed sheet steel has a chemical composition containing not more than 0.01 wt.% of C, 0.03-0.3 wt.% of Si, 0.05-2.0 wt.% of Mn, 0.017-0.15 wt.% of P, 0.005-0.1 wt.% of Al, 0.005-0.1 wt.% of Ti, not more than 0.1 wt.% of Nb, not more than 0.005 wt.% of B, and the balance comprising Fe and unavoidable impurities. The galvannealed sheet steel has an average crystal grain size at a base metal surface where the plating layer is in contact is not more than 12 mu m. The galvannealed steel sheet can be produced easily under the following conditions. A base metal the surface of which has been grind-removed by 1-8 g/m is reduced at a high temperature. During this time, the base metal is subjected to recrystallization annealing as necessary. During the cooling process from the high temperature for the reduction, the base metal is held for 10-120 seconds at a temperature of between 600 DEG C and 500 DEG C, then cooled to a plating temperature, and plated. The rate of increase of temperature between 420 DEG C - 480 DEG C for an alloying treatment of the steel sheet after the plating is not lower than 20 DEG C/sec.
摘要翻译：适合用作汽车用钢板的合金化热浸镀锌钢板及其制造方法。该钢板在压力加工中具有高耐粉化性，在寒冷地区具有高耐崩裂性。该方法也适用于生产高拉伸强度的钢板。合金化热浸镀锌钢板具有以下化学成分：C：0.01重量％以下，Si：0.03〜0.3重量％，Mn：0.05〜2.0重量％，P：0.017〜0.15重量％，0.005〜0.1重量％，Al：0.005〜0.1重量％，Nb：0.1重量％以下，B：0.005重量％以下，余量：Fe和不可避免的杂质。合金化热浸镀锌钢板在镀层接触的母材表面的平均结晶粒径不大于12μm。在以下条件下可以容易地制造合金化热镀锌钢板。其表面已被研磨去除1-8克/平方米的贱金属在高温下被还原。在此期间，根据需要对母材进行再结晶退火。在从高温还原的冷却过程中，贱金属在600〜500℃的温度下保持10-120秒，然后冷却至电镀温度，并进行镀覆。电镀后钢板的合金化处理温度在420〜480℃之间的升温速度不低于20℃/秒。

27. 发明申请

WO1997013039A1 UNSYMMETRICAL STEEL SHEET PILE AND METHOD FOR MANUFACTURING THE SAME 审中-公开
标题翻译：非对称钢板及其制造方法
公开(公告)号：WO1997013039A1
公开(公告)日：1997-04-10
申请号：PCT/JP1996002775
申请日：1996-09-26
申请人： SUMITOMO METAL INDUSTRIES, LTD.
发明人： SUMITOMO METAL INDUSTRIES, LTD. , MATSUBARA, Hiroshi , SHIKANO, Hiroshi , MASUDA, Toshiaki , ABE, Yukio
IPC分类号： E02D05/08
CPC分类号： B21B1/082 , E02D5/04
摘要： An unsymmetrical steel sheet pile and a method for manufacturing the same in which good joint shapes can be obtained without forming any convex portion by making a joint portion of a sheet pile wall become flush with a flat arm portion, while in forming a joint bend neither unstable rolling posture nor incomplete joint is provided, and a corner steel sheet pile and a method for manufacturing the same, both being used for the unsymmetrical steel sheet pile and a method for manufacturing the same. One of unsymmetrical joints has a turned-up shape, while the other has a turned-down shape, and in forming left and right joint bends rolls with different passes are used on respective sides for finishing the bends. During this process, while the formation of one of the joint bends is being finished, the other joint is only restrained in the pass with bend formation not carried out at all or carried out halfway. The corner steel sheet pile is manufactured by inverting either the inward joint portion of the above unsymmetrical steel sheet pile or the outward joint portion thereof. In another method, it is possible to manufacture it by inwardly bending either of the joints.
摘要翻译：一种不对称钢板桩及其制造方法，其中通过使板桩壁的接合部分与平坦的臂部分平齐，而不形成任何凸起部分，可以获得良好的接合形状，同时在形成接合弯曲时提供了不稳定的滚动姿势或不完全关节，以及用于非对称钢板桩的角钢板桩及其制造方法及其制造方法。非对称接头中的一个具有折叠形状，而另一个具有折弯形状，并且在各个侧面使用形成具有不同通道的左右接头弯曲辊来完成弯曲。在这个过程中，当一个关节弯曲的形成正在完成时，另一个关节只能在没有进行弯曲形成或者中途进行的过程中被束缚。角钢板桩通过使上述不对称钢板桩的向内接合部或其向外接合部反转而制造。在另一种方法中，可以通过向内弯曲任一接头来制造它。

28. 发明申请

WO1997006900A1 METHOD AND ROLL FOR HOT ROLLING A STEEL MATERIAL 审中-公开
标题翻译：用于热轧钢材的方法和滚子
公开(公告)号：WO1997006900A1
公开(公告)日：1997-02-27
申请号：PCT/JP1996002287
申请日：1996-08-12
申请人： SUMITOMO METAL INDUSTRIES, LTD. , IZAWA, Masaru , KUSABA, Yoshiaki , TSUBOUCHI, Kenji
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： B21B27/10
CPC分类号： B21B27/10 , B21B1/088
摘要： A method and a roll for hot rolling a steel material that are effective in preventing seizing between a roll and steel material being rolled, the wear of the roll and the rough surface of the roll and the steel material being rolled that are caused in hot rolling a steel material, particularly a stainless steel material. The method for hot rolling a steel material is a method for rolling while forming a coating of oxalate (iron oxalate, calcium oxalate and the like) in at least an area where the roll surface is in contact with the steel material being rolled. To be specific, for instance, a water solution containing oxalic acid or water-soluble oxalate and a water solution containing water-soluble calcium compound are used at least as a part of roll cooling fluid and rolling is performed while injecting the cooling fluid to the roll in hot rolling process from a nozzle of different system. Furthermore, the hot rolling method may be a method in which a coating of iron oxalate is formed on at least the surface of the roll in contact with the steel material being rolled by submerging the roll for hot rolling a steel material in the oxalic acid water solution or applying or spraying oxalic acid water solution to the roll for hot rolling a steel material and in which the roll for hot rolling a steel material on which the coating layer of iron oxalate is formed is used for rolling. The roll for hot rolling a steel material has the coating of oxalate formed on the area of the surface thereof in contact with the steel being rolled.
摘要翻译：一种用于热轧钢材的方法和轧辊，其有效地防止轧制和轧制的钢材之间的烧结，轧辊的磨损和轧制的粗糙表面和被轧制的钢材在热轧中引起钢材，特别是不锈钢材料。钢材的热轧方法是在辊表面与被轧钢材接触的区域中形成草酸盐（草酸铁，草酸钙等）的涂布的轧制方法。具体地说，例如，至少使用含有草酸或水溶性草酸的水溶液和含有水溶性钙化合物的水溶液作为辊冷却流体的至少一部分，并且在将冷却流体注入到从不同系统的喷嘴滚动热轧过程。此外，热轧方法可以是这样一种方法，其中至少在与被轧钢材相接触的辊的表面上形成草酸铁，该方法是将用于热轧钢材的辊浸没在草酸水中溶液或将草酸水溶液施加或喷洒到用于热轧钢材的辊中，并且其中用于轧制其上形成有草酸铁的涂层的钢材的辊用于轧制。用于热轧钢材的辊具有在与被轧制的钢接触的表面的区域上形成的草酸涂层。

29. 发明申请

WO1997006286A1 STAINLESS STEELS EXCELLENT IN THERMAL NEUTRON ABSORPTION 审中-公开
标题翻译：不锈钢在热中性吸收方面表现优异
公开(公告)号：WO1997006286A1
公开(公告)日：1997-02-20
申请号：PCT/JP1996002258
申请日：1996-08-08
申请人： SUMITOMO METAL INDUSTRIES, LTD. , KAJIMURA, Haruhiko
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： C22C38/00
CPC分类号： C22C38/54 , G21F1/08 , G21Y2002/103 , G21Y2004/10 , G21Y2004/101
摘要： A ferritic stainless steel containing the following principal chemical ingredients on the weight percentage basis and preferably satisfying the B-Gd relationship represented by the following formula (1): C: less than 0.01 %, Mn: 1 % or less, Ni: 0.7 % or less, Cr: 13-26 %, B: 0.1-1.1 %, Gd: 0.05-1.5 %, Al: 0.002-0.1 %, N: 0.015 % or less. An austenitic stainless steel containing the following principal chemical ingredients on the weight percentage basis and preferably satisfaying the B-Gd relationship represented by the following formula (1): C: 0.02 % or less, Mn: 0.1-0.9 %, Ni: 7-22 %, Cr: 18-26 %, B: 0.05-0.75 %, Gd: 0.11-1.5 %, Al: 0.005-0.1 %, N: 0.030 % or less. These steels are excellent in not only thermal neutron absorption but also hot workability, cold workability, and corrosion resistances, especially HAZ corrosion resistance, and are low in production cost. Further they have good toughness and weldability and are hence quite suitable as the material of nuclear fuel containers and so forth. Nc >/= 0.8 (1) wherein Nc = {(1-0.015 x B %) x B %} + (4.4 x Gd %).
摘要翻译：含有以下主要化学成分的铁素体不锈钢，以重量百分比计，优选满足由下式（1）表示的B-Gd关系：C：小于0.01％，Mn：1％以下，Ni：0.7％以下，Cr：13〜26％，B：0.1〜1.1％，Gd：0.05〜1.5％，Al：0.002〜0.1％，N：0.015％以下。含有以重量百分比计的以下主要化学成分的奥氏体不锈钢，优选满足由下式（1）表示的B-Gd关系：C：0.02％以下，Mn：0.1-0.9％，Ni：7- 22％，Cr：18-26％，B：0.05-0.75％，Gd：0.11-1.5％，Al：0.005-0.1％，N：0.030％以下。这些钢不仅具有热中子吸收性，而且热加工性，冷加工性，耐腐蚀性，特别是HAZ耐腐蚀性优异，制造成本低。此外，它们具有良好的韧性和可焊性，因此非常适合作为核燃料容器等的材料。 Nc> = 0.8（1）其中Nc = {（1-0.015×B％）×B％} +（4.4×Gd％）。

30. 发明申请

WO1996012574A1 METHOD OF MANUFACTURING SEAMLESS STEEL PIPES AND MANUFACTURING EQUIPMENT THEREFOR 审中-公开
标题翻译：制造无缝钢管及其制造设备的方法
公开(公告)号：WO1996012574A1
公开(公告)日：1996-05-02
申请号：PCT/JP1995002155
申请日：1995-10-20
申请人： SUMITOMO METAL INDUSTRIES, LTD. , KONDO, Kunio , OKADA, Yasutaka , TANIMOTO, Seiji
发明人： SUMITOMO METAL INDUSTRIES, LTD.
IPC分类号： B21B23/00
CPC分类号： B21B23/00 , B21B1/466 , C21D8/10
摘要： A method of manufacturing a seamless steel pipe the performance of which is superior to that of a conventional product of this kind, by simplified manufacturing steps and equipment, at a lower cost and with a high productivity, and manufacturing equipment for practicing this method. The manufacturing method comprises the following sequential steps 1-8, the steps and equipment for the production of billets to final products being connected by one continuous line: (1) step of manufacturing round billets by a continuous casting method; (2) step of cooling the billets to a temperature not higher than an Ar3 transformation point, (3) step of heating the billets to a temperature at which they can be bored, (4) step of manufacturing untreated pipes by bore-rolling the billets at a strain rate of not higher than 200/sec; (5) step of manufacturing steel pipes by draw-rolling and finish-rolling the untreated pipes at predetermined average strain rate, reduction ratio and finish temperature by rolling mill in which a continuous draw-rolling mill and finish-rolling mill are directly connected, (6) step of subjecting the steel pipes to a recrystallization treatment at a temperature not lower than an Ar3 transformation point, (7) step of hardening the steel pipes from a temperature not lower than an Ar3 transformation point; and (8) step of tempering the steel pipes.
摘要翻译：通过简化的制造步骤和设备，以较低的成本和高生产率制造无缝钢管的方法，其性能优于常规产品的方法，以及用于实施该方法的制造设备。该制造方法包括以下顺序步骤1-8，用于通过连续生产线连接生产最终产品的坯料的步骤和设备：（1）通过连续铸造方法制造圆钢坯的步骤; （2）将坯料冷却至不高于Ar 3相变点的温度的步骤，（3）将坯料加热到可以钻孔的温度的步骤，（4）通过镗削制造未处理的管道的步骤坯料的应变率不超过200 /秒; （5）通过直线连接连轧机和精轧机的轧机以预定的平均应变率，压下率和最终温度对未处理的管进行拉伸轧制和精轧来制造钢管的工序，（6）在不低于Ar3相变点的温度下对钢管进行再结晶处理的步骤，（7）从不低于Ar3相变点的温度硬化钢管的步骤; 和（8）回火钢管的步骤。

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