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1. 发明专利

JP2014114500A Heat treatment equipment line of seamless steel pipe, and production method of high strength stainless steel pipe 有权
标题翻译：无缝钢管热处理设备线及高强度不锈钢管生产方法
公开(公告)号：JP2014114500A
公开(公告)日：2014-06-26
申请号：JP2012271180
申请日：2012-12-12
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE
IPC分类号： C21D9/08 , C22C38/00 , C22C38/58
CPC分类号： C21D9/085 , C21D1/25 , C21D9/0062 , C21D9/08 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a production method of a high strength stainless steel pipe that is for imparting a stable product quality to a high Cr based seamless steel pipe in which hardening and temper treatments are performed; and a heat treatment equipment line of the high strength stainless steel pipe.SOLUTION: In online heat treatment equipment of a seamless steel pipe, low temperature cooling equipment 4 in which cooling can be performed to at most 20°C is disposed in one end or a part of a heat treatment carrier line 3 disposed between hardening equipment 2 and a temper heating furnace 5, in a heat treatment of a steel pipe including Cr of at least 14%, hardening cooling to at least 50°C is performed, continuously cooling to at least 20°C is performed, then a temper treatment is performed, and a stable quality high strength stainless steel pipe is produced.
摘要翻译：要解决的问题：提供一种高强度不锈钢管的制造方法，其用于对进行硬化和回火处理的高Cr类无缝钢管赋予稳定的产品质量; 和高强度不锈钢管的热处理设备线。解决方案：在无缝钢管的在线热处理设备中，将冷却至多20℃的低温冷却设备4设置在一端或设置在硬化设备2和回火加热炉5之间的热处理载体管线3的一部分，在包括至少14％的Cr的钢管的热处理中，淬火冷却至至少50℃，连续冷却至少20℃，然后进行回火处理，并且生产稳定质量的高强度不锈钢管。

2. 发明专利

JP2013032584A Thick-walled high-strength seamless steel pipe for linepipe having excellent sour resistance, and process for producing same 有权
标题翻译：厚壁高强度无缝钢管，具有良好的抗电阻性能，以及生产相同的工艺
公开(公告)号：JP2013032584A
公开(公告)日：2013-02-14
申请号：JP2012145097
申请日：2012-06-28
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： ISHIGURO YASUHIDE , KIMURA MITSUO , EGUCHI KENICHIRO , YOKOGAWA HIROSHI , KATAGIRI TADAO , TANAKA MASATO
IPC分类号： C22C38/00 , C21D9/08 , C22C38/14 , C22C38/58
CPC分类号： C21D9/085 , C21D1/25 , C21D1/63 , C21D8/105 , C21D2261/00 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/40 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , F16L9/02
摘要： PROBLEM TO BE SOLVED: To provide a thick-walled high-strength seamless steel pipe having excellent sour resistance.SOLUTION: The steel pipe is obtained by subjecting a raw steel pipe to quenching and tempering to regulate the treated steel pipe so as to have a yield strength exceeding 450 MPa and at least the outermost surface or innermost surface of the pipe so as to have Vickers hardness HV5, which can be measured at a load of 5 kgf (testing force, 49 N), of 250 HV5 or less. This regulation is accomplished by subjecting the steel pipe which has been quenched to working processing in which the surface layer of the steel pipe is ground by 0.3 mm or more in depth, in the thickness direction, from the surface. Alternatively, the regulation is attained by conducting the quenching in such a manner that the raw steel pipe is held in the air atmosphere at an elevated temperature not lower than the Ac3 transformation point for 120 seconds or longer and thereafter the steel pipe is water-cooled in a nucleate boiling state or is water-cooled first in a film boiling state and then in a nucleate boiling state. With such quenching, it is possible to obtain a steel pipe in which each surface layer has hardness reduced to the value of 250 HV5 or below and which has an M-shaped hardness distribution in which a position where the hardness is maximum is present at a position on the way to the center of the wall thickness from the surface, or to obtain a steel pipe that has a U-shaped or flat hardness distribution in which the hardness of the surface layers is highest but not higher than the value of 250 HV5. Thus, the obtained steel pipe has significantly improved sour resistance.
摘要翻译：要解决的问题：提供具有优异耐酸性的厚壁高强度无缝钢管。解决方案：钢管是通过对生钢管进行淬火和回火来调节经处理的钢管，以获得屈服强度超过450MPa，并且至少管的最外表面或最内表面为具有维氏硬度HV5，其可以在5kgf（测试力，49N）的负载下测量为250HV5以下。该调整是通过对被淬火的钢管进行从表面到厚度方向的深度处理钢管表面层的加工处理的0.3mm以上的处理。或者，通过进行淬火，使原料钢管在不低于Ac 3相变点的升高温度下保持在空气气氛中120秒以上，然后将钢管水冷处于核沸腾状态，或首先在薄膜沸腾状态下水冷却然后处于成核沸腾状态。通过这样的淬火，可以获得其表面层的硬度降低到250HV5以下的钢管，并且具有M形硬度分布，其中硬度最大的位置存在于从表面到达壁厚中心的位置，或获得具有U形或平坦硬度分布的钢管，其中表面层的硬度最高但不高于250 HV5的值。因此，所获得的钢管具有显着改善的耐酸性。版权所有（C）2013，JPO＆INPIT

3. 发明专利

JP2014129594A Low alloy high strength seamless steel pipe for oil wall excellent in sulfide stress corrosion crack resistance and its manufacturing method 有权
标题翻译：低合金高强度无缝钢管，适用于硫酸盐应力腐蚀抗裂性及其制造方法
公开(公告)号：JP2014129594A
公开(公告)日：2014-07-10
申请号：JP2013242665
申请日：2013-11-25
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE
IPC分类号： C21D8/10 , B21B3/00 , B21B17/02 , C22C38/00 , C22C38/32 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a method of a low alloy high strength seamless steel pipe for an oil wall excellent in high strength with yield strength of 110 Ks range and sulfide stress corrosion crack resistance under a sour environment.SOLUTION: A steel raw material having a composition containing, by mass%, C:0.15 to 0.50%, Si:0.1 to 1.0%, Mn:0.3 to 1.0%, P:0.015% or less, S:0.005% or less, Al:0.01 to 0.10%, N:0.01% or less, Cr:0.8 to 1.7%, Mo:0.2 to 1.1%, V:0.01 to 0.12%, Nb:0.01 to 0.08%, B:0.0005 to 0.0030% is heated to 1200°C or less, supplied to piercing rolling and then drawing rolling with a cross section limitation rate of 40 to 60% in a temperature range of 1000°C or higher and 10 to 40% in a temperature range of less than 1000°C, cooled to a temperature of 300°C or less, then applied a hardening treatment which is heating to the Ac3 transformation point to 1000°C again and quick cooling, and a tempering treatment which is heating to a temperature of the Ac1 transformation point or less and tempering.
摘要翻译：要解决的问题：提供一种低酸性高强度无缝钢管的方法，其优异的高强度，屈服强度为110Ks范围，硫酸盐应力腐蚀开裂性在酸性环境下。解决方案：钢原料具有质量％C：0.15〜0.50％，Si：0.1〜1.0％，Mn：0.3〜1.0％，P：0.015％以下，S：0.005％以下，Al：0.01〜0.10％，N：0.01％以下，Cr：0.8〜1.7％，Mo：0.2〜1.1％，V：0.01〜0.12％，Nb：0.01〜0.08％，B：0.0005〜0.0030％加热至1200℃以下在小于1000℃的温度范围内在1000℃以上且10〜40％的温度范围内以40〜60％的横截面限制率进行穿孔轧制，然后进行拉伸轧制，冷却至温度为300℃以下，然后进行硬化处理，再次加热至Ac 3相变点至1000℃并快速冷却，并将加热至Ac1转印温度的回火处理要点或更少，回火。

4. 发明专利

JP2014025145A High strength stainless seamless pipe for oil well having excellent corrosion resistance, and method for producing the same 有权
标题翻译：具有优异耐腐蚀性的油井的高强度不粘性无缝管及其制造方法
公开(公告)号：JP2014025145A
公开(公告)日：2014-02-06
申请号：JP2012277718
申请日：2012-12-20
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE , KIMURA MITSUO , MIYATA YUKIO
IPC分类号： C22C38/00 , C21D9/08 , C22C38/44 , C22C38/54
CPC分类号： C22C38/54 , C21D6/004 , C21D6/005 , C21D6/008 , C21D9/08 , C21D9/085 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a high strength stainless steel seamless pipe for oil well having excellent corrosion resistance, and a method for producing the same.SOLUTION: The high strength seamless steel pipe comprises, by mass, 0.05% or less of C, 0.5% or less of Si, 0.15 to 1.0% Mn, 13.5 to 15.4% Cr, 3.5 to 6.0% Ni, 1.5 to 5.0% Mo, 2.5% or lower of Cu, 2.5% or lower of W and 0.15% or lower of N so as to satisfy -5.9×(7.82+27C-0.91Si+0.21Mn-0.9Cr+Ni-1.1Mo-0.55W+0.2Cu+11N)≥13.0. In this way, the high strength seamless steel pipe having sulfur stress corrosion resistance equal to that of steel having a composition containing Cr of about 17% can be produced even by the composition containing Cr of about 15% which is relatively low.
摘要翻译：要解决的问题：提供具有优异耐腐蚀性的油井用高强度不锈钢无缝管及其制造方法。解决方案：高强度无缝钢管以质量计含有0.05％以下的C， 0.5％以下的Si，0.15〜1.0％的Mn，13.5〜15.4％的Cr，3.5〜6.0％的Ni，1.5〜5.0％的Mo，2.5％以下的Cu，2.5％以下的W和0.15％以下的 N，以满足-5.9×（7.82 + 27C-0.91Si + 0.21Mn-0.9Cr + Ni-1.1Mo-0.55W + 0.2Cu + 11N）≥13.0。以这种方式，即使含有相对较低的约15％的Cr的组合物，也可以制造具有与含有约17％的Cr组成的钢相同的耐硫应力腐蚀性的高强度无缝钢管。

5. 发明专利

JP2013227611A High strength steel excellent in ssc resistance and method of manufacturing the same 有权
标题翻译：抗高强度高强度钢及其制造方法
公开(公告)号：JP2013227611A
公开(公告)日：2013-11-07
申请号：JP2012099769
申请日：2012-04-25
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： YAMADA KATSUMI , TANAKA YUJI , ISHIGURO YASUHIDE , EGUCHI KENICHIRO
IPC分类号： C22C38/00 , C21D8/02 , C22C38/32 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive high strength steel that stably combines high strength of at least YS:120 ksi class and SSC excellent resistance.SOLUTION: A steel includes, by mass, 0.25-0.35% of C; 0.10-0.30% of Si; at most 0.80% of Mn; at most 0.010% of P; at most 0.003% of S; 0.003-0.1% of Al; at most 0.0040% of N; 0.5-0.7% of Cr; 0.5-1.0% of Mo; 0.05-0.8% of Cu; 0.015-0.030% of Ti; 0.005-0.025% of Nb; 0.05-0.10% of V; and 0.0005-0.0015% of B, and includes: a composition that contains P, Ti and N, which are regulated to satisfy P/Ti*
摘要翻译：要解决的问题：提供一种廉价的高强度钢，其稳定地结合至少YS：120ksi等级的高强度和SSC优异的耐性。解决方案：钢包含质量为0.25-0.35％的C; 0.10-0.30％的Si; 至多0.80％的锰; 至多0.010％的P; 最多0.003％的S; 0.003-0.1％的Al; 最多0.0040％的N; 0.5-0.7％的Cr; 0.5-1.0％的Mo; 0.05-0.8％的Cu; 0.015-0.030％Ti; 0.005-0.025％的Nb; 0.05-0.10％V; 和0.0005-0.0015％的B，并且包括：调节为满足P / Ti * <1.6（其中，Ti *为（有效Ti量）= Ti-3.4×N）的P，Ti和N的组合物） ; 以及由老γ粒子的平均粒径为12μm以下的回火马氏体相构成的结构。

6. 发明专利

JP2015038247A 耐硫化物応力割れ性に優れた油井用高強度継目無鋼管およびその製造方法有权
标题翻译：具有优异耐硫酸盐应力破裂的高强度无缝钢管及其生产方法
公开(公告)号：JP2015038247A
公开(公告)日：2015-02-26
申请号：JP2014186240
申请日：2014-09-12
申请人： Jfeスチール株式会社 , Jfe Steel Corp
发明人： EGUCHI KENICHIRO , YAMADA KATSUMI , KIMURA MITSUO , NAKAMICHI JIRO , ISHIGURO YASUHIDE , TANAKA YUJI
IPC分类号： C22C38/00 , C21D6/00 , C21D8/10 , C22C38/32 , C22C38/54
CPC分类号： C21D9/14 , C21D2211/004 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54
摘要：【課題】耐硫化物応力割れ性(耐SSC性)に優れた油井用高強度継目無鋼管を提供【解決手段】mass%で、C:0.15〜0.50%、Si:0.1〜1.0%、Mn:0.3〜1.0%、P:0.015%以下、S:0.005%以下、Al:0.01〜0.1%以下、N:0.01%以下、Cr:0.1〜1.7%、Mo:0.6〜1.1%、V:0.01〜0.12%、Nb:0.01〜0.08%、B:0.0005〜0.003%、Cu:1.0%以下を含み、固溶Moとして0.40%以上含有し、焼戻マルテンサイト相を主相とし、旧オーステナイト粒が粒度番号で8.5以上で、かつ略粒子状のM2C型析出物が0.06mass%以上分散してなる組織とを有する継目無鋼管とする。これにより、高強度と、優れた耐SSC性を有する継目無鋼管となる。【選択図】図1
摘要翻译：要解决的问题：提供对油井具有优异的耐硫化物应力开裂性（耐SSC性）的高强度无缝钢管。解决方案：无缝钢管以质量％计含有C：0.15〜0.50％ Si：0.1〜1.0％，Mn：0.3〜1.0％，P：0.015％以下，S：0.005％以下，Al：0.01〜0.1％以下，N：0.01％以下，Cr：0.1〜1.7％，Mo：0.6〜1.1％，V：0.01〜0.12％，Nb：0.01〜0.08％，B：0.0005〜0.003％，Cu：1.0％以下，Mo含量为0.40以上。，无缝钢管具有回火马氏体相作为主相的结构，原奥氏体晶粒的晶粒尺寸为8.5以上，大致颗粒状的MC型析出物的0.06质量分散％或者更多。这实现了具有高强度和优异的抗SSC性能的无缝钢管。

7. 发明专利

JP2014148699A Method for producing seamless steel pipe having excellent toughness and production equipment therefor 有权
标题翻译：生产具有优异韧性的无缝钢管及其生产设备的方法
公开(公告)号：JP2014148699A
公开(公告)日：2014-08-21
申请号：JP2013016459
申请日：2013-01-31
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： SUZUKI TAKESHI , EGUCHI KENICHIRO , ISHIGURO YASUHIDE
IPC分类号： C21D9/08 , C22C38/00 , C22C38/58
CPC分类号： C21D9/08 , C21D1/18 , C21D11/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a seamless steel pipe capable of reconciling the reduction in the variation of material caused by the ununiformity of structure in the thickness direction of a pipe body with maintenance in the productivity of the whole of a heat treatment line.SOLUTION: Beforehand, whether each pipe body is made of a steel kind having an Ms point less than 200°C is discriminated, after quenching, each pipe body to which the discrimination result has been hit is specially detained under a room temperature environment till the temperature difference between the highest temperature and the lowest temperature in the orthogonal cross section of the pipe axis reaches below 2.0°C (suitably, is detained after transference to a detention bed 6), and is thereafter subjected to the tempering treatment, and, on the other hand, each pipe body to which the discrimination result has not been hit is subjected to the tempering treatment without being detained.
摘要翻译：要解决的问题：提供一种无缝钢管的制造方法，该无缝钢管能够协调由管体的厚度方向的结构不均匀引起的材料变化的降低，同时维持整个热量的生产率处理线。解决方案：事先确定，每个管体是否由Ms点小于200°C的钢种制成，在淬火之后，每个管道被鉴定结果被击中是特别被拘留在室温环境直到管轴正交截面中最高温度和最低温度之间的温差达到2.0℃以下（适当地，在转移到滞留床6后被扣留），然后进行回火处理，另一方面，判定结果未被撞击的各管体经受回火处理而不被扣留。

8. 发明专利

JP2013129879A High-strength seamless steel tube for oil well with superior sulfide stress cracking resistance, and method for producing the same 审中-公开
标题翻译：高强度无缝钢管用于具有超级硫化物应力抗裂性的油井及其生产方法
公开(公告)号：JP2013129879A
公开(公告)日：2013-07-04
申请号：JP2011280675
申请日：2011-12-22
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE , MIYATA YUKIO
IPC分类号： C22C38/00 , C21D8/10 , C21D9/08 , C22C38/32 , C22C38/54
CPC分类号： C21D8/105 , C21D1/25 , C21D8/10 , C21D9/08 , C21D9/085 , C21D2211/008 , C21D2221/02 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , F16L9/02
摘要： PROBLEM TO BE SOLVED: To provide a high-strength seamless steel tube for oil wells with superior sulfide stress cracking resistance (SSC resistance).SOLUTION: The seamless steel tube has composition which contains, by mass, 0.15-0.50% of C, 0.1-1.0% of Si, 0.3-1.0% of Mn, 0.015% or less of P, 0.005% or less of S, 0.01-0.1% of Al, 0.01% or less of N, 0.1-1.7% of Cr, 0.40-1.1% of Mo, 0.01-0.08% of V, 0.01-0.08% of Nb, 0.03% or less of Ti, and 0.0005-0.003% of B, and has structure which includes a tempered martensite phase as the main phase and which contains prior-austenite grains having a grain size number of 8.5 or larger. The steel tube has such hardness distribution that the hardness is 295HV10 or less at each of an inner-side point located in the region at a distance of 2.54-3.81 mm from the inner surface of the tube, an outer-side point located at the same distance apart from the outer surface of the tube, and a point located at the center of the sheet thickness, the points being located at each of four positions apart from each other at intervals of 90° along in the circumferential direction.
摘要翻译：要解决的问题：提供具有优异的耐硫化物应力开裂性（SSC抗性）的油井用高强度无缝钢管。解决方案：无缝钢管具有以质量计含有0.15-0.50％C，0.1 -1.0％的Si，0.3-1.0％的Mn，0.015％以下的P，0.005％以下的S，0.01〜0.1％的Al，0.01％以下的N，0.1〜1.7％的Cr， 1.1％的Mo，0.01-0.08％的V，0.01-0.08％的Nb，0.03％以下的Ti和0.0005〜0.003％的B，并且具有包括回火马氏体相作为主相的结构，先前的奥氏体晶粒的晶粒度为8.5以上。钢管具有这样的硬度分布，使得在位于距管的内表面2.54-3.81mm的距离处的内侧点的每个位置处的硬度为295HV 10或更小，外侧点位于距离管的外表面相同的距离以及位于板厚中心的点，这些点位于沿圆周方向以90°的间隔彼此分开的四个位置中的每一个处。

9. 发明专利

JP2011246798A High-strength seamless steel tube for oil well with excellent resistance to sulfide stress cracking, and method for producing the same 有权
标题翻译：用于具有优良抗硫化物应力裂纹的油井的高强度无缝钢管及其制造方法
公开(公告)号：JP2011246798A
公开(公告)日：2011-12-08
申请号：JP2010141870
申请日：2010-06-22
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , YAMADA KATSUMI , KIMURA MITSUO , NAKAMICHI JIRO , ISHIGURO YASUHIDE , TANAKA YUJI
IPC分类号： C22C38/00 , C21D8/10 , C22C38/32 , C22C38/54
CPC分类号： C21D9/14 , C21D2211/004 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a high-strength seamless steel tube for oil wells with an excellent sulfide-stress-cracking (SSC) resistance.SOLUTION: The seamless steel tube has: a composition which contains, in terms of mass%, 0.15 to 0.50% of C, 0.1 to 1.0% of Si, 0.3 to 1.0% of Mn, 0.015% or less of P, 0.005% or less of S, 0.01 to 0.1% of Al, 0.01% or less of N, 0.1 to 1.7% of Cr, 0.40 to 1.1% of Mo, 0.01 to 0.08% of V, 0.01 to 0.08% of Nb, and 0.0005 to 0.003% of B, and 0.40% or more of Mo as solid solution Mo; and a metallographic structure having tempered martensite phase as a main phase and former austenite grains with a grain size number of 8.5 or above and dispersing 0.06 mass% or more of substantially particulate MC precipitates. In addition, it is possible to achieve further improvement of SSC resistance characteristics by providing densified regions of Mo on former γ grain boundaries and by setting a dislocation density to 6.0×10/mor less.
摘要翻译：要解决的问题：提供具有优异的耐硫化物应力开裂（SSC）阻力的油井用高强度无缝钢管。解决方案：无缝钢管具有：以质量％计含有0.15〜0.50％的C，0.1〜1.0％的Si，0.3〜1.0％的Mn，0.015％以下的P， 0.005％以下的S，0.01〜0.1％的Al，0.01％以下的N，0.1〜1.7％的Cr，0.40〜1.1％的Mo，0.01〜0.08％的V，0.01〜0.08％的Nb， 0.0005〜0.003％的B，和0.40％以上的Mo作为固溶体Mo; 以及具有回火马氏体相作为主相的金相组织和粒径为8.5以上的奥氏体晶粒，分散为0.06质量％以上的基本上为微粒的M 14 / m，可以进一步提高SSC电阻特性 2 以下。版权所有（C）2012，JPO＆INPIT

10. 发明专利

JP2012026030A Steel pipes for oil well use excellent in sulfide stress cracking resistance, and manufacturing method of the same 有权
标题翻译：用于油田的钢管在硫应力抗裂性能方面优异，并且其制造方法
公开(公告)号：JP2012026030A
公开(公告)日：2012-02-09
申请号：JP2011117507
申请日：2011-05-26
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： TANAKA YUJI , YAMADA KATSUMI , EGUCHI KENICHIRO , ISHIGURO YASUHIDE
IPC分类号： C22C38/00 , B21B3/00 , C21D8/10 , C22C38/32 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To stably provide a low-alloy steel pipe for oil well with both a high strength and a sulfide stress cracking resistance.SOLUTION: The steel pipe for oil well contains, by mass%, C in 0.18-0.25%; Si in 0.1-0.3%; Mn in 0.4-0.8%; P in 0.015% or less; S in 0.005% or less; Al in 0.01-0.1%; Cr in 0.3-0.8%; Mo in 0.5-1.0%; Nb in 0.003-0.015%; Ti in 0.002-0.05%; and B in 0.003% or less; and the balance being Fe and unavoidable impurities. The steel pipe for oil well has a tempered martensite phase as a main phase and is characterized in that the number of MC or MC included in a region of 20 μm×20 μm, having an aspect ratio of 3 or less and a longer diameter of 300 nm or more when the shape of carbide is elliptical, is 10 or less, MCis less than 1 mass%, needle-like MC is deposited in a gain and the quantity of Nb deposited as carbide with the size of 1 μm or more is less than 0.005% by mass%.
摘要翻译：要解决的问题：为了稳定地提供具有高强度和耐硫化物应力开裂性的油井的低合金钢管。
解决方案：油井钢管以质量％计含有0.18-0.25％的C; Si为0.1-0.3％; Mn在0.4-0.8％; P在0.015％以内; S在0.005％以下; Al在0.01-0.1％; Cr在0.3-0.8％; Mo为0.5-1.0％; Nb在0.003-0.015％; Ti为0.002-0.05％; B为0.003％以下; 余量为Fe和不可避免的杂质。用于油井的钢管具有回火马氏体相作为主相，其特征在于M 3 或M 2 < / SB> C，当碳化物的形状为椭圆形时，长宽比为3以下，长径为300nm以上的区域为20μm以下20μm以下，M 23 C 6 小于1质量％，针状M 2 以1μm以上的大小的碳化物沉积的Nb的量的增益小于0.005质量％。版权所有（C）2012，JPO＆INPIT

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