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1. 发明专利

JP2014012890A Low alloy high strength seamless steel pipe for oil well having excellent sulfide stress corrosion cracking resistance and its manufacturing method 有权
标题翻译：低合金高强度无缝钢管，具有优异的硫酸应变腐蚀开裂电阻及其制造方法
公开(公告)号：JP2014012890A
公开(公告)日：2014-01-23
申请号：JP2013118441
申请日：2013-06-05
申请人： Jfe Steel Corp , Jfeスチール株式会社
发明人： EGUCHI KENICHIRO , ISHIGURO YASUHIDE , OKATSU MITSUHIRO , SUGANO YOSHIYUKI , MIYATA YUKIO
IPC分类号： C22C38/00 , C21D9/08 , C22C38/32 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a low alloy high strength seamless steel pipe for an oil well having excellent sulfide stress corrosion cracking resistance and its manufacturing method.SOLUTION: A seamless steel pipe contains a composition comprising, 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:0.1 to 1.7%, Mo:0.4 to 1.1%, V:0.01 to 0.12%, Nb:0.01 to 0.08%, Ti:0.005 to 0.03% and B:0.0005 to 0.0030% and has each segregation degree of Mn, Mo and Cr in a segregation part of 1.5 or less. A manufacturing method of the seamless steel pipe includes applying, to the seamless steel pipe, segregation lowering treatment for heating the seamless steel pipe at T (°C) in range of 1100°C to 1300°C and maintaining for a definite period of time and then cooling it, and thereafter, applying hardening treatment one or more times and then tempering treatment.
摘要翻译：要解决的问题：提供一种具有优异的耐硫化物应力腐蚀开裂性的油井的低合金高强度无缝钢管及其制造方法。无缝钢管含有以质量％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：0.01〜0.10％，N：0.01％以下，Cr：0.1〜1.7 ％，Mo：0.4〜1.1％，V：0.01〜0.12％，Nb：0.01〜0.08％，Ti：0.005〜0.03％，B：0.0005〜0.0030％，偏析Mn，Mo，Cr的偏析度部分为1.5以下。无缝钢管的制造方法包括向无缝钢管施加在1100℃〜1300℃的T（℃）下加热无缝钢管的偏析降低处理，并保持一定时间然后冷却，然后进行一次或多次硬化处理，然后进行回火处理。

2. 发明公开

EP3173764A4 STEEL SULFIDE-STRESS-CRACKING TEST METHOD AND SEAMLESS STEEL PIPE HAVING EXCELLENT SULFIDE-STRESS-CRACKING RESISTANCE 有权
标题翻译： STAHLSULFIDSPANNUNGSRISSTESTVERFAHREN UND NAHTLOSES STAHLROHR MIT HERVORRAGENDEM SULFIDSPANNUNGSRISSWIDERSTAND
公开(公告)号：EP3173764A4
公开(公告)日：2017-07-26
申请号：EP15824727
申请日：2015-07-17
申请人： JFE STEEL CORP
发明人： YUGA MASAO , ISHIGURO YASUHIDE , FUJIMURA KAZUKI , OKATSU MITSUHIRO , SUGANO YOSHIYUKI
IPC分类号： G01N3/08 , C22C38/00 , C22C38/50 , G01N17/00
CPC分类号： G01N17/006 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , G01N3/08 , G01N17/00
摘要： When the resistance to sulfide stress corrosion cracking is evaluated by applying a constant load stress Ã (MPa) to a round bar tensile test specimen immersed in a test solution and checking whether failure occurs before a particular time passes, the round bar tensile test specimen including a parallel section, a shoulder section, and a grip section is used. In the round bar tensile test specimen, the shoulder section is formed by a curve having two or more radii of curvature, a radius of curvature R1 (mm) of a portion adjacent to the parallel section is 15 mm or more and satisfies (0.22Ã - 119) ‰¤ R1 ‰¤ 100, a length X1 (mm) of a portion of the curve having the radius of curvature R1 in a longitudinal direction of the test specimen satisfies X1 ‰¥ ˆš{(r/8) × (R1 - r 2 /4)} (r: radius (mm) of the round bar tensile test specimen in the parallel section), and the radius of curvature R1 is larger than other radii of curvature. Thus, even when the steel is a high-strength steel having a yield strength of 758 MPa or higher, the occurrence of the failure in the shoulder section is suppressed, and the resistance to sulfide stress corrosion cracking can be properly evaluated.
摘要翻译：当通过对浸入试验溶液中的圆棒拉伸试验样品施加恒定负荷应力（MPa）并且在特定时间过后检查是否发生破坏来评价耐硫化物应力腐蚀开裂性能时，圆棒拉伸试验样品包括平行部分，肩部部分和把手部分。在圆棒拉伸试验片中，肩部由具有两个以上曲率半径的曲线形成，与平行部相邻的部分的曲率半径R1（mm）为15mm以上，满足（0.22× -119）≤R1≤100，曲率半径R1在试验片长度方向上的曲率部分的长度X1（mm）满足下式：（R1）×（R1 - r 2/4）}（r：平行截面中的圆棒拉伸试验片的半径（mm）），曲率半径R1大于其他曲率半径。因此，即使在钢为屈服强度为758MPa以上的高强度钢的情况下，也能够抑制肩部的失效发生，能够适当地评价耐硫化物应力腐蚀开裂性。

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