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1. 发明授权

US07416617B2 High strength seamless steel pipe excellent in hydrogen-induced cracking resistance 有权
标题翻译：高强度无缝钢管耐氢腐蚀性能优良
公开(公告)号：US07416617B2
公开(公告)日：2008-08-26
申请号：US11088740
申请日：2005-03-25
申请人： Nobutoshi Murao , Nobuyuki Hisamune , Hajime Osako , Kunio Kondo
发明人： Nobutoshi Murao , Nobuyuki Hisamune , Hajime Osako , Kunio Kondo
IPC分类号： C22C38/22 , C22C38/28 , C22C38/50
CPC分类号： C21D9/08 , C21D8/10 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/22 , C22C38/24
摘要： A high strength seamless steel pipe having mgh yield stress and excellent hydrogen-induced cracking resistance, comprises by mass %, C: 0.03-0.11%, Si: 0.05-0.5%, Mn: 0.8-1.6%, p: 0.025% or less, S: 0.003% or less, Ti: 0.002-0.017%, Al: 0.001-0.10%, Cr: 0.05-0.5%, Mo: 0.02-0.3%, V: 0.02-0.20%, Ca 0.0005-0.005%, N: 0.008% or less and O (Oxygen): 0.004% or less, the balance Fe and impurities. The steel microstructure is bainite and/or martensite and ferrite is precipitated at grain boundaries. The seamless steel pipe can contain at least one of Cu: 0.05-0.5% and Ni: 0.05-0.5%. To produce the pipe, it is desirable to limit a starting temperature of quenching after rolling, a cooling rate and a tempering temperature.
摘要翻译：具有mgh屈服应力和优异的氢诱发开裂性的高强度无缝钢管以质量％计含有C：0.03〜0.11％，Si：0.05〜0.5％，Mn：0.8〜1.6％，p：0.025％以下，S：0.003％以下，Ti：0.002〜0.017％，Al：0.001〜0.10％，Cr：0.05〜0.5％，Mo：0.02〜0.3％，V：0.02〜0.20％，Ca：0.0005〜0.005％：0.008％以下，O（氧）：0.004％以下，余量为Fe和杂质。钢组织为贝氏体和/或马氏体，铁素体在晶界析出。无缝钢管可以含有Cu：0.05〜0.5％，Ni：0.05〜0.5％中的至少一种。为了制造管，优选限制轧制后的淬火起始温度，冷却速度和回火温度。

2. 发明申请

US20080283161A1 High strength seamless steel pipe excellent in hydrogen-induced cracking resistance and its production method 审中-公开
标题翻译：高强度无缝钢管耐氢破坏性优良及其制备方法
公开(公告)号：US20080283161A1
公开(公告)日：2008-11-20
申请号：US12219390
申请日：2008-07-22
申请人： Nobutoshi Murao , Nobuyuki Hisamune , Hajime Osako , Kunio Kondo
发明人： Nobutoshi Murao , Nobuyuki Hisamune , Hajime Osako , Kunio Kondo
IPC分类号： C21D9/08
CPC分类号： C21D9/08 , C21D8/10 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/22 , C22C38/24
摘要： The present invention relates to a high strength seamless steel pipe excellent in hydrogen-induced cracking resistance, characterized by consisting of, by mass %, C: 0.03-0.11%, Si: 0.05-0.5%, Mn: 0.8-1.6%, P: 0.025% or less, S: 0.003% or less, Ti: 0.002-0.017%, Al: 0.001-0.10%, Cr: 0.05-0.5%, Mo: 0.02-0.3%, V: 0.02-0.20%, Ca: 0.0005-0.005%, N: 0.008% or less and O (Oxygen): 0.004% or less, and the balance Fe and impurities, and also characterized in that the microstructure of the steel is bainite and/or martensite, ferrite is precipitated at grain boundaries and yield stress is 483 MPa or more. Further, to ensure high strength of the steel, the seamless steel pipe preferably contains, by mass %, at least one of Cu: 0.05-0.5% and Ni: 0.05-0.5%. To produce the above-mentioned steel pipe, it is desirable to limit a starting temperature of quenching after rolling, a cooling rate and a tempering temperature. By this configuration a seamless steel pipe having an yield stress of 483 MPa or more and excellent HIC resistance, which is suitable for a pipeline, can be provided.
摘要翻译：本发明涉及氢诱发抗裂性优异的高强度无缝钢管，其特征在于以质量％计含有C：0.03-0.11％，Si：0.05-0.5％，Mn：0.8-1.6％，P ：0.025％以下，S：0.003％以下，Ti：0.002〜0.017％，Al：0.001-0.10％，Cr：0.05〜0.5％，Mo：0.02〜0.3％，V：0.02〜0.20％，Ca： 0.0005-0.005％，N：0.008％以下，O（氧）：0.004％以下，余量为Fe和杂质，其特征在于，钢的组织为贝氏体和/或马氏体，铁素体析出晶界和屈服应力为483MPa以上。此外，为了确保钢的高强度，无缝钢管优选以质量％计含有Cu：0.05〜0.5％和Ni：0.05〜0.5％中的至少一种。为了制造上述钢管，优选限制轧制后的淬火起始温度，冷却速度和回火温度。通过这种结构，可以提供一种适用于管道的屈服应力为483MPa以上，耐HIC电阻优异的无缝钢管。

3. 发明申请

US20050167013A1 High strength seamless steel pipe excellent in hydrogen-induced cracking resistance and its production method 有权
标题翻译：高强度无缝钢管耐氢破坏性优良及其制备方法
公开(公告)号：US20050167013A1
公开(公告)日：2005-08-04
申请号：US11088740
申请日：2005-03-25
申请人： Nobutoshi Murao , Nobuyuki Hisamune , Hajime Osako , Kunio Kondo
发明人： Nobutoshi Murao , Nobuyuki Hisamune , Hajime Osako , Kunio Kondo
IPC分类号： C21D8/10 , C21D9/08
CPC分类号： C21D9/08 , C21D8/10 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/22 , C22C38/24
摘要： A high strength seamless steel pipe having mgh yield stress and excellent hydrogen-induced cracking resistance, comprises by mass %, C: 0.03-0.11%, Si: 0.05-0.5%, Mn: 0.8-1.6%, P: 0.025% or less, S: 0.003% or less, Ti: 0.002-0.017%, Al: 0.001-0.10%, Cr: 0.05-0.5%, Mo: 0.02-0.3%, V: 0.02-0.20%, Ca: 0.0005-0.005%, N: 0.008% or less and O (Oxygen): 0.004% or less, the balance Fe and impurities. The steel microstructure is bainite and/or martensite and ferrite is precipitated at grain boundaries. The seamless steel pipe can contain at least one of Cu: 0.05-0.5% and Ni: 0.05-0.5%. To produce the pipe, it is desirable to limit a starting temperature of quenching after rolling, a cooling rate and a tempering temperature.
摘要翻译：具有mgh屈服应力和优异的氢诱发开裂性的高强度无缝钢管以质量％计含有C：0.03-0.11％，Si：0.05-0.5％，Mn：0.8-1.6％，P：0.025％以下，S：0.003％以下，Ti：0.002〜0.017％，Al：0.001-0.10％，Cr：0.05〜0.5％，Mo：0.02〜0.3％，V：0.02〜0.20％，Ca：0.0005〜0.005％ N：0.008％以下，O（氧）：0.004％以下，余量为Fe和杂质。钢组织为贝氏体和/或马氏体，铁素体在晶界析出。无缝钢管可以含有Cu：0.05〜0.5％，Ni：0.05〜0.5％中的至少一种。为了制造管，优选限制轧制后的淬火起始温度，冷却速度和回火温度。

4. 发明授权

US07815755B2 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：US07815755B2
公开(公告)日：2010-10-19
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： C22C38/44 , C22C38/50
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% 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 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，并且具有由不大于20体积％的多边形铁素体组成的微结构，不大于10 马氏体和残留奥氏体的混合显微组织的体积％，以及平衡贝氏体。 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。

5. 发明授权

US07896985B2 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：US07896985B2
公开(公告)日：2011-03-01
申请号：US12071493
申请日：2008-02-21
申请人： Yuji Arai , Kunio Kondo , Nobuyuki Hisamune
发明人： Yuji Arai , Kunio Kondo , Nobuyuki Hisamune
IPC分类号： C21D9/08 , C22C38/44
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 a high strength and good toughness and corrosion resistance even though having a thick wall 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% to 1.2%, N: 0.002-0.015%, Ca: 0.0002-0.007%, and a remainder of Fe and impurities, wherein the contents of the impurities are at most 0.03% for P, at most 0.005% for S, at most 0.005% for O and less than 0.0005% for B and wherein the value of Pcm calculated by the following Equation (1) is at least 0.185 and at most 0.250. The steel pipe has a microstructure which primarily comprises bainite and which has a length of cementite of at most 20 micrometers: Pcm=[C]+[Si]/30+([Mn]+[Cr]+[Cu])/20+[Mo]/15+[V]/10+5[B] (1) wherein [C], [Si], [Mn], [Cr], [Cu], [Mo], [V] and [B] are numbers respectively indicating the content in mass percent of C, Si, Mn, Cr, Cu, Mo, V and B.
摘要翻译：即使具有厚壁，也具有高强度，良好的韧性和耐腐蚀性的线管用无缝钢管，其化学成分的质量百分比含有C：0.02〜0.08％，Si：0.5％以下，Mn：1.5 -3.0％，Al：0.001-0.10％，Mo：大于0.4％-1.2％，N：0.002-0.015％，Ca：0.0002-0.007％，余量为Fe和杂质，杂质含量为 P最多为0.03％，S为0.005％以下，O为0.005％以下，B为0.0005％以下，其中，通过下述式（1）计算出的Pcm值为0.185以上且0.250以下。钢管具有主要包括贝氏体并且具有至多20微米的渗碳体长度的微结构：Pcm = [C] + [Si] / 30 +（[Mn] + [Cr] + [Cu]）/ 20 + [Mo] / 15 + [V] / 10 + 5 [B]（1）其中〔C〕，〔Si〕，〔Mn〕，〔Cr〕，〔Cu〕，〔Mo〕，〔V〕， B]是分别表示C，Si，Mn，Cr，Cu，Mo，V和B的质量含量的数字。

6. 发明申请

US20090114318A1 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：US20090114318A1
公开(公告)日：2009-05-07
申请号：US12071493
申请日：2008-02-21
申请人： Yuji Arai , Kunio Kondo , Nobuyuki Hisamune
发明人： Yuji Arai , Kunio Kondo , Nobuyuki Hisamune
IPC分类号： C21D9/08 , C22C38/00 , C22C38/04
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 a high strength and good toughness and corrosion resistance even though having a thick wall 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% to 1.2%, N: 0.002-0.015%, Ca: 0.0002-0.007%, and a remainder of Fe and impurities, wherein the contents of the impurities are at most 0.03% for P, at most 0.005% for S, at most 0.005% for O and less than 0.0005% for B and wherein the value of Pcm calculated by the following Equation (1) is at least 0.185 and at most 0.250. The steel pipe has a microstructure which primarily comprises bainite and which has a length of cementite of at most 20 micrometers: Pcm=[C]+[Si]/30+([Mn]+[Cr]+[Cu])/20+[Mo]/15+[V]/10+5[B] (1) wherein [C], [Si], [Mn], [Cr], [Cu], [Mo], [V] and [B] are numbers respectively indicating the content in mass percent of C, Si, Mn, Cr, Cu, Mo, V and B.
摘要翻译：即使具有厚壁，也具有高强度，良好的韧性和耐腐蚀性的线管用无缝钢管，其化学成分的质量百分比含有C：0.02〜0.08％，Si：0.5％以下，Mn：1.5 -3.0％，Al：0.001-0.10％，Mo：大于0.4％-1.2％，N：0.002-0.015％，Ca：0.0002-0.007％，余量为Fe和杂质，杂质含量为 P最多为0.03％，S为0.005％以下，O为0.005％以下，B为0.0005％以下，其中，通过下述式（1）计算出的Pcm值为0.185以上且0.250以下。钢管具有主要包括贝氏体并且具有至多20微米的渗碳体长度的微结构：<？在线公式描述=“在线公式”end =“lead”？> Pcm = [C] + [Si] / 30 +（[Mn] + [Cr] + [Cu]）/ 20+ [Mo] / 15 + [V] / 10 + 5 [B]（1）其中[C]，[Si]，[Mn]，[Cr]，[Cu]，[Mo]，[V]和[B]分别表示 C，Si，Mn，Cr，Cu，Mo，V和B的质量含量。

7. 发明申请

US20100236670A1 HEAVY WALL SEAMLESS STEEL PIPE FOR LINE PIPE AND A MANUFACTURING METHOD THEREOF 审中-公开
标题翻译：重型无缝钢管管线及其制造方法
公开(公告)号：US20100236670A1
公开(公告)日：2010-09-23
申请号：US12791486
申请日：2010-06-01
申请人： Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
发明人： Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
IPC分类号： C21D8/10 , C21D9/08
CPC分类号： C22C38/00 , B21B19/04 , B21B23/00 , C21D8/10 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/58
摘要： A method of manufacturing a heavy wall seamless steel pipe for line pipe with a high strength and increased toughness, which is characterized by cooling rate, heating condition for piercing, and heat treating after pipe making, wherein the chemical composition consists, by mass %, of C: 0.03 to 0.08%, Si: not more than 0.25%, 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 1.2%, Ti: 0.004 to 0.010%, N: 0.002 to 0.008%, and 0.0002 to 0.005%, in total, of at least one selected from Ca, Mg and REM, and the balance Fe and impurities, optionally including B: 0.0003 to 0.01%, V: 0 to 0.08%, Nb: 0 to 0.05% or Cu: 0 to 1.0%, and that P and S among impurities are not more than 0.05% and not more than 0.005%, respectively.
摘要翻译：其特征在于冷却速度，穿孔加热条件和制管后的热处理，其特征在于，所述化学成分以质量％计， C：0.03〜0.08％，Si：不大于0.25％，Mn：0.3〜2.5％，Al：0.001〜0.10％，Cr：0.02〜1.0％，Ni：0.02〜1.0％，Mo：0.02〜1.2％，Ti：0.004〜0.010％，N：0.002〜0.008％，以及选自Ca，Mg和REM中的至少一种中的至少一种为0.0002〜0.005％，余量为Fe和杂质，任选地包括B：0.0003〜0.01 ％，V：0〜0.08％，Nb：0〜0.05％，Cu：0〜1.0％，杂质中的P和S分别为0.05％以上且0.005％以下。

8. 发明申请

US20080047635A1 Heavy wall seamless steel pipe for line pipe and a manufacturing method thereof 审中-公开
标题翻译：线管用重壁无缝钢管及其制造方法
公开(公告)号：US20080047635A1
公开(公告)日：2008-02-28
申请号：US11895131
申请日：2007-08-23
申请人： Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
发明人： Kunio Kondo , Yuji Arai , Nobuyuki Hisamune
IPC分类号： C21D8/10 , C21D9/08 , C22C38/50
CPC分类号： C22C38/00 , B21B19/04 , B21B23/00 , C21D8/10 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/50 , C22C38/58
摘要： A heavy wall seamless steel pipe for line pipe with a high strength and increased toughness, which has a chemical composition, by mass %, that consists of C: 0.03 to 0.08%, Si: not more than 0.25%, 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 1.2%, Ti: 0.004 to 0.010%, N: 0.002 to 0.008%, and 0.0002 to 0.005%, in total, of at least one selected from Ca, Mg and REM, and the balance Fe and impurities, optionally including V: 0 to 0.08%, Nb: 0 to 0.05% or Cu: 0 to 1.0%, and that P and S among impurities are not more than 0.05% and not more than 0.005% respectively. It may contain 0.0003 to 0.01% of boron. A manufacturing method thereof is characterized by cooling rate, heating condition for piercing, and heat treating after pipe making.
摘要翻译：一种具有高强度和增加的韧性的管道管的重壁无缝钢管，其具有由C：0.03至0.08％，Si：不大于0.25％，Mn：0.3至2.5的质量％的化学组成％，Al：0.001〜0.10％，Cr：0.02〜1.0％，Ni：0.02〜1.0％，Mo：0.02〜1.2％，Ti：0.004〜0.010％，N：0.002〜0.008％，0.0002〜0.005％选自Ca，Mg和REM中的至少一种，余量为Fe和杂质，任选地包括V：0至0.08％，Nb：0至0.05％或Cu：0至1.0％，以及P和S 杂质分别不超过0.05％且不超过0.005％。可含有0.0003〜0.01％的硼。其制造方法的特征在于冷却速度，穿孔加热条件和制管后的热处理。

9. 发明授权

US07931757B2 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：US07931757B2
公开(公告)日：2011-04-26
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： C22C38/04 , C22C38/12 , 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＆nlE; [Mn]×[Mo]＆nlE; 2.6其中[Mn]和[Mo]分别是以Mn和Mo的含量相当于以质量％计的数量。

10. 发明申请

US20080216928A1 Seamless steel pipe for line pipe and a method for its manufacture 有权
标题翻译：管道无缝钢管及其制造方法
公开(公告)号：US20080216928A1
公开(公告)日：2008-09-11
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： C21D1/18 , C22C38/38 , C22C38/22
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。

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