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11. 发明授权

US07896984B2 Method for manufacturing seamless steel pipe for line pipe 有权
标题翻译：线管无缝钢管的制造方法
公开(公告)号：US07896984B2
公开(公告)日：2011-03-01
申请号：US12071517
申请日：2008-02-21
申请人： Kenji Kobayashi , Tomohiko Omura , Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
发明人： Kenji Kobayashi , Tomohiko Omura , Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
IPC分类号： C21D8/10 , C21D9/08
CPC分类号： C22C38/005 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/04 , C22C38/06 , C22C38/12 , Y10S148/909
摘要： A seamless steel pipe for line pipe having high strength and stable toughness and having resistance to sulfide corrosion cracking at low temperatures to room temperature is provided. A seamless steel pipe according to the present invention has a chemical composition comprising, in mass percent, C: 0.03-0.08%, Si: 0.05-0.5%, Mn: 1.0-3.0%, Mo: greater than 0.4% to 1.2%, Al: 0.005-0.100%, Ca: 0.001-0.005%, a remainder of Fe and impurities including N, P, S, O, and Cu, with the impurities containing at most 0.01% of N, at most 0.05% of P, at most 0.01% of S, at most 0.01% of O, and at most 0.1% of Cu, and having a microstructure comprising a bainitic-martensitic dual phase structure.
摘要翻译：提供了一种具有高强度和稳定韧性并且在低温至室温下具有耐硫化物腐蚀开裂性的线管用无缝钢管。根据本发明的无缝钢管具有以质量％计含有C：0.03-0.08％，Si：0.05-0.5％，Mn：1.0-3.0％，Mo：大于0.4％至1.2％的化学组成， Al：0.005-0.100％，Ca：0.001-0.005％，剩余的Fe和杂质包括N，P，S，O和Cu，杂质含量最多为0.01％，P最多为0.05％最多0.01％的S，至多0.01％的O和至多0.1％的Cu，并且具有包含贝氏体 - 马氏体双相结构的微结构。

12. 发明申请

US20080257459A1 Seamless steel pipe and manufacturing method thereof 有权
标题翻译：无缝钢管及其制造方法
公开(公告)号：US20080257459A1
公开(公告)日：2008-10-23
申请号：US12010459
申请日：2008-01-25
申请人： Yuji Arai , Kunio Kondo , Nobuyuki Hisamune
发明人： Yuji Arai , Kunio Kondo , Nobuyuki Hisamune
IPC分类号： C21D9/08
CPC分类号： C21D8/10 , C21D9/08 , C22C38/001 , C22C38/002 , C22C38/44 , C22C38/50 , C22C38/52
摘要： The present invention relates to the following seamless steel pipes excellent in strength, toughness and weldability, particularly suitable for submarine flow lines, and a manufacturing method thereof.An as-quenched seamless steel pipe having a chemical composition consisting of, by mass %, C: 0.03 to 0.08%, Mn: 0.3 to 2.5%, Al: 0.001 to 0.10%, Cr: 0.02 to 1.0%, Ni: 0.02 to 1.0%, Mo: 0.02 to 0.8%, Ti: 0.004 to 0.010%, N: 0.002 to 0.008%, Ca: 0.0005 to 0.005%, and the balance Fe and impurities, with not more than 0.25% of Si, not more than 0.05% of P, not more than 0.005% of S, less than 0.005% of Nb, and less than 0.0003% of B as the impurities, and having a microstructure consisting of not more than 20 volume % of polygonal ferrite, not more than 10 volume % of a mixed microstructure of martensite and retained austenite, and the balance bainite. B can be 0.0003 to 0.001%. Mg and/or REM can be contained. The manufacturing method is characterized by the cooling rate during quenching.
摘要翻译：本发明涉及以下具有优异的强度，韧性和焊接性的无缝钢管，特别适用于海底流水线及其制造方法。一种淬火后的无缝钢管，其组成为以质量％计含有C：0.03〜0.08％，Mn：0.3〜2.5％，Al：0.001〜0.10％，Cr：0.02〜1.0％，Ni：0.02〜 1.0％，Mo：0.02〜0.8％，Ti：0.004〜0.010％，N：0.002〜0.008％，Ca：0.0005〜0.005％，余量为Fe和杂质，不大于0.25％ 0.05％的P，不大于0.005％的S，小于0.005％的Nb和小于0.0003％的作为杂质的B，并且具有不大于20体积％的多边形铁素体的微结构，不大于 10体积％的马氏体和残余奥氏体的混合显微组织，以及余量的贝氏体。 B可以为0.0003〜0.001％。可以含有Mg和/或REM。制造方法的特征在于淬火时的冷却速度。

13. 发明申请

US20080219878A1 Seamless steel pipe for line pipe and a process for its manufacture 有权
标题翻译：管道无缝钢管及其制造工艺
公开(公告)号：US20080219878A1
公开(公告)日：2008-09-11
申请号：US12071492
申请日：2008-02-21
申请人： Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
发明人： Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
IPC分类号： C22C38/02 , C22C38/16 , C21D8/10
CPC分类号： C22C38/005 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/04 , C22C38/06 , C22C38/12 , Y10S148/909
摘要： A thick-walled seamless steel pipe for line pipe which has a high strength and improved toughness and corrosion resistance in spite of the thick wall and which is suitable for use as a riser and flow line has a chemical composition comprising, in mass percent, C: 0.02-0.08%, Si: at most 0.5%, Mn: 1.5-3.0%, Al: 0.001-0.10%, Mo: greater than 0.4%-1.2%, N: 0.002-0.015%, at least one of Ca and REM in a total amount of 0.0002-0.007%, and a remainder of Fe and impurities, with the impurities having the content of P: at most 0.05%, S: at most 0.005%, and O: at most 0.005%, the chemical composition satisfying the inequality: 0.8≦[Mn]×[Mo]≦2.6, wherein [Mn] and [Mo] are the numbers equivalent to the contents of Mn and Mo, respectively, in mass percent.
摘要翻译：尽管厚壁具有高强度和改善的韧性和耐腐蚀性并且适合用作提升管和流动管线的管道管的厚壁无缝钢管具有以质量％计含有C ：0.02-0.08％，Si：至多0.5％，Mn：1.5-3.0％，Al：0.001-0.10％，Mo：大于0.4％-1.2％，N：0.002-0.015％，Ca和 REM总量为0.0002-0.007％，余量为Fe和杂质，杂质含量最多为0.05％，S：0.005％以下，O：0.005％以下。满足不等式的组成：0.8 <= [Mn] x [Mo]≤2.6，其中[Mn]和[Mo]分别等于Mn和Mo的含量，以质量％计。

14. 发明申请

US20060219332A1 Manufacturing method of high strength, high toughness seamless steel pipe for linepipe 审中-公开
标题翻译：线性管高强度，高韧性无缝钢管的制造方法
公开(公告)号：US20060219332A1
公开(公告)日：2006-10-05
申请号：US11393793
申请日：2006-03-31
申请人： Tsuneo Murase , Kunio Kondo , Nobuyuki Hisamune
发明人： Tsuneo Murase , Kunio Kondo , Nobuyuki Hisamune
IPC分类号： C21D9/08
CPC分类号： C22C38/02 , C21D8/10 , C21D9/08 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/18
摘要： A manufacturing method of high-strength, high-toughness seamless steel pipe for linepipe comprises: (1) hot piercing a billet, in which the carbon equivalent value Ceq defined by expression (a): Ceq=C+Mn/6+(Cu+Ni)/5+(Cr+Mo+V)/5[%] . . . (a) is not greater than 0.60 wt %, and then subjecting the pierced billet to hot rolling at a temperature of 950° C. or higher to obtain a seamless steel pipe; (2) putting the seamless steel pipe immediately, without cooling to Ar3 point or lower, into a furnace kept at Ar3 point+50° C. to 1100° C. to carry out heating; (3) cooling the seamless steel pipe at a cooling rate of 5° C./sec or higher; and (4) tempering the seamless steel pipe at temperature of 550° C. to Ac1 point. A high-strength and high-toughness seamless steel pipe with little strength unevenness can be manufactured, which can be effectively employed for linepipes in cold areas.
摘要翻译：用于管线管的高强度，高韧性无缝钢管的制造方法包括：（1）热刺穿坯料，其中由式（a）定义的碳当量值Ceq：Ceq = C + Mn / 6 +（Cu + Ni）/ 5 +（Cr + Mo + V）/ 5 [％]。。。（a）不大于0.60重量％，然后在950℃以上的温度下对穿孔坯进行热轧，得到无缝钢管; （2）将冷却至Ar3点以下的无缝钢管立即放入保持Ar3点+50℃〜1100℃的炉中进行加热; （3）以5℃/秒以上的冷却速度冷却无缝钢管; （4）将温度为550℃的无缝钢管回火至Ac1点。可以制造出具有很小强度不均匀性的高强度高韧性无缝钢管，这可以有效地用于寒冷地区的管线管。

15. 发明授权

US5938865A Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance 失效
标题翻译：具有优异的耐硫化物应力开裂性的高强度无缝钢管的制造方法
公开(公告)号：US5938865A
公开(公告)日：1999-08-17
申请号：US952222
申请日：1998-02-05
申请人： Kunio Kondo , Takahiro Kushida , Hajime Osako , Hideki Takabe
发明人： Kunio Kondo , Takahiro Kushida , Hajime Osako , Hideki Takabe
IPC分类号： B21B19/04 , B21B23/00 , C21D8/10
CPC分类号： B21B23/00 , C21D8/10 , B21B19/04
摘要： A process for producing a seamless steel pipe wherein pipe manufacturing steps and the heat treatment steps are carried out in one production line. The properties of the pipe are comparative or superior to those of the pipe manufactured in the conventional reheating, quenching and tempering process. The process is characterized by using the billet of a low alloy steel containing C: 0.15-0.50%, Cr: 0.1-1.5%, Mo: 0.1-1.5%, Al: 0.005-0.50%, Ti: 0.005-0.50% and Nb: 0.003-0.50%, and comprising the following steps (1) to (5).(1) hot rolling with 40% or more of cross sectional reduction ratio,(2) finishing the hot rolling in a temperature range of 800-1100.degree. C.,(3) putting the manufactured steel pipe promptly in a complementary heating apparatus after the finish rolling, and complementarily heating at the temperature and time satisfying the following formula (a).(4) quenching the steel pipe immediately after taking out of the complementary heating apparatus, and(5) tempering the pipe at a temperature not higher than the Ac.sub.1 transformation point as the last heat treatment.23500.ltoreq.(T+273).times.(21+log t).ltoreq.26000 (a)where, T (.degree.C.) is a temperature of not lower than 850.degree. C., and t is time (hr). Further, an intermediate heat treatment consisting of quenching or combination of quenching and tempering may be applied between the steps (4) and (5).
摘要翻译： PCT No.PCT / JP96 / 01274 Sec。 371日期：1998年2月5日 102（e）日期1998年2月5日PCT提交1996年5月15日PCT公布。公开号WO96 / 36742 日期：1996年11月21日一种生产无缝钢管的方法，其中在一条生产线中进行管制造步骤和热处理步骤。管道的性能与传统的再加热，淬火和回火工艺中制造的管材的性能相比甚至更好。该方法的特征在于使用含有C：0.15-0.50％，Cr：0.1-1.5％，Mo：0.1-1.5％，Al：0.005-0.50％，Ti：0.005-0.50％的低合金钢和Nb ：0.003-0.50％，并且包括以下步骤（1）至（5）。（1）以40％以上的横截面减速比进行热轧，（2）在800-1100℃的温度范围内完成热轧，（3）将制造的钢管迅速置于互补的加热装置中精轧，并在满足下述式（a）的温度和时间下互补加热。（4）在取出补充加热装置后立即淬火钢管，（5）在不高于Ac1相变点的温度下对管进行回火作为最后的热处理.23500

16. 发明授权

US09109268B2 Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well 有权
标题翻译：油井不锈钢，油井不锈钢管，油井不锈钢制造方法
公开(公告)号：US09109268B2
公开(公告)日：2015-08-18
申请号：US13276374
申请日：2011-10-19
申请人： Hideki Takabe , Kunio Kondo , Hisashi Amaya , Taro Ohe , Yohei Otome
发明人： Hideki Takabe , Kunio Kondo , Hisashi Amaya , Taro Ohe , Yohei Otome
IPC分类号： C22C38/42 , C21D8/02 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , F16L9/02
CPC分类号： C22C38/50 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/005 , C21D8/0205 , C21D8/105 , C21D9/08 , C21D9/085 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , F16L9/02
摘要： The chemical composition of a stainless steel in accordance with the present invention consists of C: not more than 0.05%, Si: not more than 0.5%, Mn: 0.01 to 0.5%, P: not more than 0.04%, S: not more than 0.01%, Cr: more than 16.0 and not more than 18.0%, Ni: more than 4.0 and not more than 5.6%, Mo: 1.6 to 4.0%, Cu: 1.5 to 3.0%, Al: 0.001 to 0.10%, and N: not more than 0.050%, the balance being Fe and impurities, and satisfies Formulas (1) and (2). Also, the micro-structure thereof contains a martensitic phase and a ferritic phase having a volume ratio of 10 to 40%, and the ferritic phase distribution ratio is higher than 85%. Cr+Cu+Ni+Mo≧25.5 (1) −8≦30(C+N)+0.5Mn+Ni+Cu/2+8.2−1.1(Cr+Mo)≦−4 (2)
摘要翻译：根据本发明的不锈钢的化学组成由C：不大于0.05％，Si：不大于0.5％，Mn：0.01至0.5％，P：不大于0.04％，S：不大于 0.01％以上，Cr：16.0以上18.0％以下，Ni：4.0以上5.6％以下，Mo：1.6〜4.0％，Cu：1.5〜3.0％，Al：0.001〜0.10％ N：不大于0.050％，余量为Fe和杂质，并满足式（1）和（2）。此外，其微结构含有马氏体相和体积比为10〜40％的铁素体相，铁素体相分布比高于85％。 Cr + Cu + Ni +Mo≥25.5（1）-8＆nlE; 30（C + N）+ 0.5Mn + Ni + Cu / 2 + 8.2-1.1（Cr + Mo）＆nlE; -4（2）

17. 发明授权

US08608872B2 High-strength stainless steel pipe excellent in sulfide stress cracking resistance and high-temperature carbonic-acid gas corrosion resistance 有权
标题翻译：高强度不锈钢管具有优异的耐硫化应力开裂性和高温碳酸气体耐腐蚀性能
公开(公告)号：US08608872B2
公开(公告)日：2013-12-17
申请号：US13082432
申请日：2011-04-08
申请人： Kunio Kondo , Hisashi Amaya , Hideki Takabe , Taro Ohe
发明人： Kunio Kondo , Hisashi Amaya , Hideki Takabe , Taro Ohe
IPC分类号： C22C38/42 , C22C38/44
CPC分类号： C22C38/42 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44
摘要： The problem to be solved is the provision of a high-strength stainless steel pipe having a sufficient corrosion resistance in a high-temperature carbonic acid gas environment and having an excellent sulfide stress cracking resistance at normal temperature. A high-strength stainless steel pipe consist of, by mass %, C: 0.05% or less, Si: 1.0% or less, P: 0.05% or less, S: less than 0.002%, Cr: more than 16% and 18% or less, Mo: more than 2% and 3% or less, Cu: 1% to 3.5%, Ni: 3% or more and less than 5%, Al: 0.001% to 0.1% and O: 0.01% or less, Mn: 1% or less and N: 0.05% or less, and Mn and N in the above ranges satisfy formula (1), and the balance being Fe and impurities; and the metal micro-structure of the stainless steel pipe mainly includes a martensitic phase and comprises 10 to 40% of a ferritic phase by volume fraction and 10% or less of a retained γ-phase by volume fraction. [Mn]×([N]−0.0045)≦0.001 (1) wherein the symbols of elements in formula (1) respectively represent the contents (unit: mass %) of the elements in the steel.
摘要翻译：要解决的问题是在高温碳酸气体环境中提供具有足够耐腐蚀性的高强度不锈钢管，并且在常温下具有优异的耐硫化物应力开裂性。高强度不锈钢管以质量％计含有C：0.05％以下，Si：1.0％以下，P：0.05％以下，S：小于0.002％，Cr：16％以上18以下％以下，Mo：大于2％，3％以下，Cu：1〜3.5％，Ni：3％以上且小于5％，Al：0.001〜0.1％，O：0.01％以下，Mn：1％以下，N：0.05％以下，上述范围的Mn和N满足式（1），余量为Fe和杂质; 并且不锈钢管的金属微结构主要包括马氏体相，并且包含10〜40体积％的铁素体相和10体积％以下的γ相。 [Mn]×（[N] -0.0045）@ 0.001（1）其中，式（1）中的元素的符号分别表示钢中元素的含量（单位：质量％）。

18. 发明申请

US20120328897A1 HIGH-STRENGTH STAINLESS STEEL FOR OIL WELL AND HIGH-STRENGTH STAINLESS STEEL PIPE FOR OIL WELL 有权
标题翻译：用于油井的高强度不锈钢和用于油井的高强度不锈钢管
公开(公告)号：US20120328897A1
公开(公告)日：2012-12-27
申请号：US13607957
申请日：2012-09-10
申请人： Taro OHE , Hisashi Amaya , Hideki Takabe , Kunio Kondo , Yohei Otome
发明人： Taro OHE , Hisashi Amaya , Hideki Takabe , Kunio Kondo , Yohei Otome
IPC分类号： C22C38/42 , C22C38/46 , B32B15/01 , C22C38/50 , C22C38/54 , B32B1/08 , C22C38/44 , C22C38/48
CPC分类号： C21D8/10 , C21D8/105 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , Y10T428/12292
摘要： A high-strength stainless steel for oil well having corrosion resistance excellent in a high-temperature environment, having excellent SSC resistance at normal temperature, and having better workability than 13% Cr steels has a chemical composition containing, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.3%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01%, the balance being Fe and impurities, a microstructure containing a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%.
摘要翻译：在高温环境下耐腐蚀性优异，在常温下具有优异的耐SSC性，并且具有比13％Cr钢更好的加工性的油井用高强度不锈钢具有以质量％计含有C：at 最多0.05％，Si：1.0％以下，Mn：0.3％以下，P：0.05％以下，S：小于0.002％，Cr：16％以上18％以下，Mo：1.5〜3.0％ Cu：1.0〜3.5％，Ni：3.5〜6.5％，Al：0.001〜0.1％，N：0.025％以下，O：0.01％以下，余量为Fe，杂质，含有马氏体相的组织， 10 -48.5％体积比的铁素体相和至少10％的残余奥氏体相的体积比，至少758MPa的屈服强度和至少10％的均匀伸长率。

19. 发明申请

US20120299469A1 ELECTROLUMINESCENT ELEMENT, METHOD FOR MANUFACTURING ELECTROLUMINESCENT ELEMENT, DISPLAY DEVICE AND ILLUMINATING DEVICE 审中-公开
标题翻译：电致发光元件，制造电致发光元件的方法，显示装置和照明装置
公开(公告)号：US20120299469A1
公开(公告)日：2012-11-29
申请号：US13519599
申请日：2010-12-21
申请人： Kunio Kondo , Kanjiro Sako , Masaru Tajima , Katsumasa Hirose
发明人： Kunio Kondo , Kanjiro Sako , Masaru Tajima , Katsumasa Hirose
IPC分类号： H05B33/12 , H05B33/10
CPC分类号： H01L51/5275 , H01L27/3281 , H01L27/329 , H01L51/5209 , H05B33/14
摘要： Disclosed is an electroluminescent element (10) which includes an anode layer (12), a cathode layer (14), a first low refractive index layer (13) that is formed between the anode layer (12) and the cathode layer (14), a recessed portion (16) that penetrates at least the anode layer (12) and the first low refractive index layer (13), a second low refractive index layer (19) that is formed on the bottom of the recessed portion (16), and a light emitting portion (17) that is formed on the second low refractive index layer (19). The electroluminescent element (10) is also characterized in that the refractive index of the first low refractive index layer (13) and the refractive index of the second low refractive index layer (19) are lower than the refractive index of the light emitting portion (17). The electroluminescent element (10) provides an electroluminescent element which has high light-emitting efficiency when the light emitted from the light emitting portion is taken out from the substrate side.
摘要翻译：公开了一种电致发光元件（10），其包括形成在阳极层（12）和阴极层（14）之间的阳极层（12），阴极层（14），第一低折射率层（13），至少穿透所述阳极层（12）和所述第一低折射率层（13）的凹部（16），形成在所述凹部（16）的底部上的第二低折射率层（19）和形成在第二低折射率层（19）上的发光部分（17）。电致发光元件（10）的特征还在于，第一低折射率层（13）的折射率和第二低折射率层（19）的折射率低于发光部分（的折射率） 17）。电致发光元件（10）提供当从基板侧取出从发光部分发出的光时具有高发光效率的电致发光元件。

20. 发明申请

US20120267014A1 METHOD FOR MANUFACTURING SEAMLESS STEEL PIPE FOR LINE PIPE AND SEAMLESS STEEL PIPE FOR LINE PIPE 有权
标题翻译：线管用线管和无缝钢管制造无缝钢管的方法
公开(公告)号：US20120267014A1
公开(公告)日：2012-10-25
申请号：US13540016
申请日：2012-07-02
申请人： Keisuke Hitoshio , Kunio Kondo , Yuji Arai
发明人： Keisuke Hitoshio , Kunio Kondo , Yuji Arai
IPC分类号： C21D9/08 , C22C38/04 , C22C38/18 , C22C38/08 , C22C38/38 , C22C38/02 , C22C38/16
CPC分类号： C21D8/105 , C21D1/18 , C21D9/08 , C21D9/085 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , F16L9/02
摘要： There is provided a method for manufacturing a seamless steel pipe for line pipe, capable of improving the toughness of the seamless steel pipe for line pipe. A round billet having a chemical composition, by mass percent, of C: 0.02 to 0.15%, Si: at most 0.5%, and Mn: 0.5 to 2.5%, the balance being Fe and impurities, is heated. The heated round billet is piercing-rolled to produce a hollow shell. The hollow shell is elongated and rolled and sized to produce a seamless steel pipe. The seamless steel pipe is water cooled, and the water cooling is stopped when the temperature of the seamless steel pipe reaches at most 450° C. The water-cooled seamless steel pipe is quenched, and the quenched seamless steel pipe is tempered.
摘要翻译：提供一种能够提高线管用无缝钢管的韧性的管线管用无缝钢管的制造方法。将化学组成按C：0.02〜0.15％，Si：0.5％以下，Mn：0.5〜2.5％的化学组成的圆坯加热，其余为Fe和杂质。加热的圆形坯料被穿孔轧制以制造中空壳体。中空的外壳是细长的并且被轧制和大小以产生无缝钢管。无缝钢管水冷却，当无缝钢管的温度达到450℃以上时，水冷停止。水冷无缝钢管淬火，淬火无缝钢管回火。

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