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1. 发明专利

JP2008248330A Low yield ratio high strength high toughness steel pipe and manufacturing method therefor 有权
标题翻译：低强度高强度高韧性钢管及其制造方法
公开(公告)号：JP2008248330A
公开(公告)日：2008-10-16
申请号：JP2007091865
申请日：2007-03-30
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHINGU TOYOHISA , ISHIKAWA NOBUYUKI , OKATSU MITSUHIRO , SHIKAUCHI NOBUO
IPC分类号： C21D8/10 , C22C38/00 , C22C38/16 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a large diameter welded steel pipe (UOE steel pipe) having little quality deterioration after being subjected to coating treatment, suitable to a line pipe mainly transporting crude oil and natural gas, and a manufacturing method therefor.
SOLUTION: A steel composed by mass% of 0.03-0.1% C, 0.01-0.5% Si, 1.2-2.0% Mn, 0.05-0.4% Mo, ≥0.1% Cu+Ni, 0.005-0.04% Ti, 0.005-0.07% Nb, ≤0.08% Al, ≤0.005% N, wherein ≥3 Ti/N, and if necessary, one or more kinds from among V, Cr, Ca, B and the balance Fe with inevitable impurities, wherein formula (1) is satisfied is heated at 1,000-1,300°C, and after hot-rolling of the steel at Ar
3 temperature or higher to rolling-finishing temperature, an accelerated cooling is applied to the steel to 500-650°C at ≥5°C/s cooling speed, and thereafter immediately, the steel is reheated to 550-750°C at ≥0.5°C/s temperature raising speed, thereby a steel sheet is obtained in which the metallurgical structure is three-phase structure of ferrite, bainite and island-state martensite, and the volume fraction of the island-state martensite is 3-15% and the volume fraction of the retained austenite is ≥2%, and the uniform elongation in the longitudinal direction is ≥12%, the obtained steel sheet is formed into the pipe-shape by cold formation, and the butted part is welded to form into the steel pipe and a coating treatment is applied to the steel pipe at ≤300°C heating temperature. The formula (1) is Ceql≤0.40, wherein, Ceql=C+Mn/6+(Cu+Ni)/15+(Cr+Mo+V)/5.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种适用于主要运输原油和天然气的管线管的，经过涂覆处理后质量劣化很小的大直径焊接钢管（UOE钢管）及其制造方法。
解决方案：由质量％为0.03-0.1％C，0.01-0.5％Si，1.2-2.0％Mn，0.05-0.4％Mo，≥0.1％Cu + Ni，0.005-0.04％Ti，0.005 -0.07％Nb，≤0.08％Al，≤0.005％N，其中≥3Ti/ N，如果需要，V，Cr，Ca，B中的一种或多种，余量为Fe与不可避免的杂质，其中式 1）在1000-1,300℃下被加热，并且在Ar 3 温度或更高温度至轧制温度之后，对钢进行加速冷却至500 -650℃，≥5℃/ s的冷却速度，其后立即将钢在≥0.5℃/ s升温速度下再加热到550-750℃，得到钢板，其中冶金结构是铁素体，贝氏体和岛状马氏体的三相结构，岛状马氏体的体积分数为3-15％，残留奥氏体的体积分数为≥2％，纵向的均匀伸长率方向≥12％，o 通过冷成形将成品钢板形成为管状，将对接部焊接成钢管，在钢管的加热温度为300℃以下进行涂布处理。式（1）为Ce++≤0.40，其中CeCl = C + Mn / 6 +（Cu + Ni）/ 15 +（Cr + Mo + V）/ 5。版权所有（C）2009，JPO＆INPIT

2. 发明专利

JP2008248328A Low yield ratio, high strength and high toughness steel sheet, and method for producing the same 有权
标题翻译：低屈服强度，高强度和高韧性钢板及其制造方法
公开(公告)号：JP2008248328A
公开(公告)日：2008-10-16
申请号：JP2007091789
申请日：2007-03-30
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHINGU TOYOHISA , ISHIKAWA NOBUYUKI , OKATSU MITSUHIRO , SHIKAUCHI NOBUO
IPC分类号： C22C38/00 , B21B3/00 , C21D8/02 , C22C38/16 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a low yield ratio, high strength and high toughness steel sheet mainly suitable for use in a line pipe field, and to provide a method for producing the same.
SOLUTION: Disclosed is a steel sheet having a component comprising, by mass, 0.03 to 0.08% C, 0.01 to 0.5% Si, 1.2 to 2.0% Mn, 0.05 to 0.4% Mo, ≥0.1% Cu+Ni, 0.005 to 0.04% Ti, 0.005 to 0.07% Nb and ≤0.08% Al, and, if necessary, comprising one or two or more kinds selected from V, Cr, Ca and B, and the balance Fe with inevitable impurities, and having a three phase metallic structure of ferrite, bainite and insular martensite in which the volume fraction of the insular martensite is 3 to 15% and the volume fraction of retained austenite is ≥2%, and uniform elongation in the longitudinal direction is ≥12%. The steel having the component is heated at 1,000 to 1,300°C, is hot-rolled at a rolling finishing temperature of an Ar
3 temperature or above, is thereafter subjected to accelerated cooling to 500 to 650°C at a cooling rate of ≥5°C/s, and is immediately reheated to 550 to 750°C at a temperature rising rate of ≥0.5°C/s.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供主要适用于管线管道领域的低屈服比，高强度和高韧性钢板，并提供其制造方法。解决方案：公开了一种钢板，其具有以质量计含有0.03〜0.08％C，0.01〜0.5％Si，1.2〜2.0％Mn，0.05〜0.4％Mo，≥0.1％Cu + Ni，0.005 至0.04％Ti，0.005-0.07％Nb和≤0.08％Al，如果需要，可以包含选自V，Cr，Ca和B中的一种或两种以上，余量为Fe和不可避免的杂质，并且具有三铁素体，贝氏体和岛状马氏体的三相金属结构，其中岛状马氏体的体积分数为3〜15％，残留奥氏体的体积分数为≥2％，长度方向的均匀伸长率为≥12％。将具有该组分的钢加热至1,000至1300℃，在Ar 3 温度或更高的轧制终轧温度下进行热轧，然后经加速冷却至500至650℃ 以≥5℃/ s的冷却速度，以≥0.5℃/ s的升温速度立即再加热至550〜750℃。版权所有（C）2009，JPO＆INPIT

3. 发明专利

JP2008056961A HIGH STRENGTH WELDED STEEL PIPE HAVING TENSILE STRENGTH OF 760 MPa OR MORE AND HAVING EXCELLENT TOUGHNESS IN WELDING HEAT-AFFECTED ZONE, AND MANUFACTURING METHOD THEREFOR 有权
标题翻译：具有760MPa或更高的拉伸强度的高强度焊接钢管，并且在焊接热影响区域具有优异的韧性，以及其制造方法
公开(公告)号：JP2008056961A
公开(公告)日：2008-03-13
申请号：JP2006233188
申请日：2006-08-30
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , ISHIKAWA NOBUYUKI , OKATSU MITSUHIRO
IPC分类号： C22C38/00 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength welded steel pipe having excellent HAZ (Heat-Affected Zone) toughness and having tensile strength of 760 MPa or more, and a manufacturing method therefor.
SOLUTION: This welded steel pipe has a basic material composed of, by mass, 0.03-0.12% C, 0.01-0.5% Si, 1.5-3.0% Mn, 0.01-0.08% Al, 0.01-0.08% Nb, 0.005-0.025% Ti, 0.001-0.010% N, ≤0.003% O, ≤0.003% S and further, one or more elements of Cu, Ni, Cr, Mo, V and if necessary, one or more elements of Ca, REM, Zr, Mg, B and satisfying 0.19≤P
CM ≤0.30 and the balance Fe with inevitable impurities, and a longitudinal seam welded joint in which a micro-structure in a zone from the welded bond part to the welded bond +1mm is a lower bainite having at least 50% or more in area ratio and an upper bainite or martensite or these mixed structure, and satisfies hardness of 250≤HV(98N)≤350.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供具有优异的HAZ（受热影响区）韧性和拉伸强度为760MPa以上的高强度焊接钢管及其制造方法。解决方案：该焊接钢管具有基本材料，其质量为0.03-0.12％C，0.01-0.5％Si，1.5-3.0％Mn，0.01-0.08％Al，0.01-0.08％Nb，0.005 -0.025％Ti，0.001-0.010％N，≤0.003％O，≤0.003％S，此外，Cu，Ni，Cr，Mo，V中的一种或多种元素，如果需要，一种或多种Ca，REM， Zr，Mg，B，并且满足0.19≤P CM ≤0.30，余量为Fe与不可避免的杂质，以及纵向缝焊接头，其中从焊接部分到焊接接头+1mm是具有至少50％以上面积比的下贝氏体和上贝氏体或马氏体或这些混合结构，并且满足250≤HV（98N）≤350的硬度。版权所有（C）2008，JPO＆INPIT

4. 发明专利

JP2008023569A METHOD FOR PRODUCING ULTRAHIGH-STRENGTH WELDED STEEL PIPE HAVING TENSILE STRENGTH EXCEEDING 800 MPa 有权
标题翻译：生产超高强度焊接钢管的方法，具有超过800 MPa的拉伸强度
公开(公告)号：JP2008023569A
公开(公告)日：2008-02-07
申请号：JP2006200516
申请日：2006-07-24
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHIMAMURA JUNJI , ISHIKAWA NOBUYUKI , OKATSU MITSUHIRO
IPC分类号： B23K26/20 , B21C37/08 , B23K9/025 , B23K9/16 , B23K9/18 , B23K9/23 , B23K35/30 , B23K101/06 , B23K103/04 , C21D8/02 , C21D8/10 , C22C38/00 , C22C38/58
CPC分类号： B23K26/1429
摘要： PROBLEM TO BE SOLVED: To provide a method for producing an ultrahigh-strength welded steel pipe having a tensile strength exceeding 800 MPa and suitable as the one for transporting natural gas and crude oil. SOLUTION: A steel sheet having a composition comprising, by mass, 0.03 to 0.12% C, ≤0.5% Si, 1.8 to 3.0% Mn, ≤0.010% P, ≤0.002% S, 0.01 to 0.08% Al, ≤0.7% Cu, 0.01 to 3.0% Ni, ≤1.0% Cr, ≤1.0% Mo, 0.01 to 0.08% Nb, ≤0.10% V, 0.005 to 0.025% Ti, ≤0.005% B, ≤0.01% Ca, ≤0.02% REM, ≤0.03% Zr, ≤0.01% Mg, 0.001 to 0.006% N and ≤0.22 PcmB, and the balance Fe with inevitable impurities is cold-worked so as to be formed into a pipe shape, and thereafter, the butted parts are welded by a hybrid welding process in which a laser using a CO 2 gas shield and gas shield arc welding using an Ar-CO 2 gas shield are combined. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供一种拉伸强度超过800MPa并适合作为运输天然气和原油的超高强度焊接钢管的制造方法。解决方案：一种组合物，其组成包括：质量为0.03〜0.12％的C，≤0.5％的Si，1.8〜3.0％的Mn，≤0.010％的P，≤0.002％的S，0.01〜0.08％的Al，≤ 0.7％Cu，0.01〜3.0％Ni，≤1.0％Cr，≤1.0％Mo，0.01〜0.08％Nb，≤0.10％V，0.005〜0.025％Ti，≤0.005％B，≤0.01％Ca，≤0.02％ REM，≤0.03％Zr，≤0.01％Mg，0.001〜0.006％N，≤0.22PcmB，余量为不可避免的杂质的Fe被冷加工成管状，其后的对接部分为通过混合焊接工艺进行焊接，其中使用使用Ar-CO 2气体屏蔽的气体保护罩和气体屏蔽电弧焊接的激光器被组合。版权所有（C）2008，JPO＆INPIT

5. 发明专利

JP2005060825A Steel sheet with low yield ratio, high strength and high toughness, and manufacturing method therefor 有权
标题翻译：低成本，高强度，高韧性的钢板及其制造方法
公开(公告)号：JP2005060825A
公开(公告)日：2005-03-10
申请号：JP2004174359
申请日：2004-06-11
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHINGU TOYOHISA , ENDO SHIGERU , ISHIKAWA NOBUYUKI , MURAOKA RYUJI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet with a low yield ratio, high strength and high toughness, which does not increase a material cost through adding a large amount of alloy elements or the like, does not deteriorate the toughness of a weld heat-affected zone, and is manufactured at high manufacturing efficiency and at a low cost; and to provide a manufacturing method therefor.
SOLUTION: The steel sheet with the low yield ratio, high strength and high toughness comprises, by mass%, 0.03-0.1% C, 0.01-0.5% Si, 1.2-2.5% Mn, 0.05-0.4% Mo, 0.005-0.04% Ti, 0.08% or less Al, while controlling C/(Mo+Ti) to 1.2 to 3.0, and the balance substantially Fe; and has a metallographic structure of a three-phase structure consisting substantially of ferrite, bainite and island martensite, in which an area fraction of the island martensite is 3 to 20%. The steel sheet preferably further includes, by mass%, 0.005-0.07% Nb and/or 0.005-0.1% V, and controls C/(Mo+Ti+Nb+V) to 1.2 to 3.0.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：待解决的问题：为了提供低成品率，高强度和高韧性的钢板，通过添加大量的合金元素等不会增加材料成本，不会降低韧性焊接热影响区域，并且以高制造效率和低成本制造; 并提供其制造方法。解决方案：低屈服比，高强度和高韧性的钢板以质量％计含有0.03-0.1％的C，0.01-0.5％的Si，1.2-2.5％的Mn，0.05-0.4％的Mo，0.005 -0.04％Ti，0.08％以下Al，同时将C /（Mo + Ti）控制在1.2〜3.0，余量基本上为Fe; 并且具有基本上由铁素体，贝氏体和岛状马氏体构成的三相结构的金相组织，其中岛状马氏体的面积分数为3〜20％。钢板优选还含有以质量％计含有0.005-0.07％Nb和/或0.005-0.1％V，并将C /（Mo + Ti + Nb + V）控制在1.2〜3.0。版权所有（C）2005，JPO＆NCIPI

6. 发明专利

JP2004131810A Method for manufacturing steel pipe having excellent buckling resistance performance 有权
公开(公告)号：JP2004131810A
公开(公告)日：2004-04-30
申请号：JP2002298121
申请日：2002-10-11
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： ISHIKAWA NOBUYUKI , ENDO SHIGERU , MATSUDA YOHEI
IPC分类号： B21C37/08 , C21D8/10 , C22C38/00 , C22C38/12 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a steel pipe of an API (American Petroleum Institute) standard X52 grade having excellent buckling resistance performance.
SOLUTION: A billet which contains, by mass %, 0.05 to 0.12% C, 0.01 to 0.50% Si, 0.5 to 2.0% Mn, 0.05 to 0.50% Mo, and 0.01 to 0.08% Al is further added at need with one or ≥2 kinds of ≤0.05% Cu, 0.5% Ni, ≤0.5% Cr, ≤0.05% Nb, ≤0.1% V, and ≤0.05% Ti, and consists of the balance Fe and inevitable impurities is hot rolled at a rolling end temperature (Ar3-10) to (Ar3+80)°C and is then air cooled to be made into a steel plate having ≤2.0% yield elongation of a stress-strain curve and thereafter the steel plate is subjected to pipe expanding of 0.5 to 1.5% expansion rate by cold working as a final stage of pipe making.
COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2004003015A High-strength steel sheet for line pipe superior in hic resistance, and manufacturing method therefor 有权
公开(公告)号：JP2004003015A
公开(公告)日：2004-01-08
申请号：JP2003121928
申请日：2003-04-25
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHINGU TOYOHISA , ENDO SHIGERU , ISHIKAWA NOBUYUKI , SUWA MINORU
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To inexpensively provide a steel sheet for a line pipe with a high strength of a APIX65 grade or higher, having superior resistance against HIC (hydrogen induced cracking) in a central segregation part and HIC initiating from the proximity of the surface and inclusions, without adding a large amount of alloy elements to it.
SOLUTION: The high-strength steel sheet for the line pipe superior in HIC resistance comprises, by mass%, 0.02-0.08% C, 0.01-0.5% Si, 0.5-1.8% Mn, 0.01% or less P, 0.002% or less S, 0.05-0.5% Mo, 0.005-0.04% Ti, 0.07% or less Al, and the balance substantially Fe; has C/(Mo+Ti) of 0.5-3, which is a ratio of, by atom%, a C content to a total content of Mo and Ti; and has a two-phase structure substantially consisting of ferrite and bainite as a metallographic structure; and has precipitates containing Ti and Mo dispersed.
COPYRIGHT: (C)2004,JPO

8. 发明专利

JP2003321730A High strength steel sheet for line pipe having excellent hic resisting property and production method thereof 审中-公开
标题翻译：具有优良HIC电阻性能的线管的高强度钢板及其生产方法
公开(公告)号：JP2003321730A
公开(公告)日：2003-11-14
申请号：JP2002125819
申请日：2002-04-26
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHINGU TOYOHISA , ENDO SHIGERU , ISHIKAWA NOBUYUKI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide, without adding large quantities of alloy elements, a high strength steel sheet which satisfies at least API X65 grade and which has excellent HIC (hydrogen induced cracking) resisting properties to HIC in the central segregated part and HIC occurring from the vicinity of the surface and from inclusions at a low cost.
SOLUTION: The high strength steel sheet having excellent HIC resisting properties has a composition containing, by mass, 0.02 to 0.08% C, 0.01 to 0.50% Si, 0.5 to 1.8% Mn, ≤0.01% P, ≤0.002% S, 0.05 to 1.0% W, 0.005 to 0.04% Ti and 0.01 to 0.07% Al, and the balance substantially Fe, wherein C/(W+Ti), i.e., the ratio between the C content and the total content of W and Ti by atomic % is 0.5 to 3.0. The steel sheet has a dual metallic structure consisting substantially of ferrite and bainite. Precipitates containing Ti and W are dispersed into the ferritic phase.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了在不添加大量合金元素的情况下，提供满足至少API X65等级并且在中心偏析部分中具有优异HIC（氢诱发开裂）抗HIC能力的高强度钢板和HIC以低成本从表面附近和夹杂物出现。解决方案：具有优异的耐HIC性能的高强度钢板具有以质量计含有C 0.02〜0.08％，Si：0.01〜0.50％，Mn：0.5〜1.8％，≤0.01％P，≤0.002％S ，0.05〜1.0％的W，0.005〜0.04％的Ti和0.01〜0.07％的Al，余量基本上为Fe，其中C /（W + Ti），即C含量与W和Ti的总含量之比原子％为0.5〜3.0。钢板具有基本上由铁素体和贝氏体组成的双金属结构。含有Ti和W的沉淀物分散在铁素体相中。版权所有（C）2004，JPO

9. 发明专利

JP2003321725A High strength steel sheet and production method thereof 有权
标题翻译：高强度钢板及其生产方法
公开(公告)号：JP2003321725A
公开(公告)日：2003-11-14
申请号：JP2002125818
申请日：2002-04-26
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： SHINGU TOYOHISA , ENDO SHIGERU , ISHIKAWA NOBUYUKI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength steel sheet which can be produced at a low cost without adding large quantities of alloy elements, and to provide a production method thereof. SOLUTION: The high strength steel sheet has a composition containing, by mass, 0.02 to 0.04 to 0.10% Ti and 0.01 to 0.08% Al, and the balance substantially Fe. The steel sheet has a dual phase structure consisting substantially of ferrite and bainite. The steel sheet preferably contains one or two kinds of metals selected from 0.005 to 0.07% Nb and 0.005 to 0.10% V as well. COPYRIGHT: (C)2004,JPO
摘要翻译：待解决的问题：提供一种能够以低成本生产而不添加大量合金元素的高强度钢板，并提供其制造方法。解决方案：高强度钢板具有以质量计含有C：0.02〜0.07％，Si：0.01〜0.5％，Mn：0.5〜2.0％，Mo：0.05〜0.5％，Ti：0.04〜0.10％ 0.01〜0.08％Al，余量基本为Fe。钢板具有基本上由铁素体和贝氏体组成的双相结构。钢板优选含有选自0.005〜0.07％Nb和0.005〜0.10％V的一种或两种金属。版权所有（C）2004，JPO

10. 发明专利

JP2003313641A Steel sheet pile having joint with high strength and manufacturing method therefor 审中-公开
标题翻译：具有高强度接头的钢板桩及其制造方法
公开(公告)号：JP2003313641A
公开(公告)日：2003-11-06
申请号：JP2002123465
申请日：2002-04-25
申请人： Jfe Steel Kk , Jfeスチール株式会社
发明人： YOKOYAMA HIROYASU , ISHIKAWA NOBUYUKI , SUWA MINORU
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet pile having a high strength joint which shows yield strength of 510 MPa or higher and total elongation of 17% or higher when tested by using a round bar test piece for the tensile test specified in JIS14A, as tensile properties of the joint. SOLUTION: This steel sheet pile has a composition comprising 0.02-0.08% C, 0.01-0.50% Si, 0.5-1.8% Mn, 0.01% or less P, 0.01 or less S, 0.05-0.50% Mo, 0.005-0.04% Ti, 0.01-0.07% Al, further at least one of 0.005-0.05% Nb and 0.005-0.10% V (by mass% heretofore) and the balance substantially Fe; has a carbon equivalent (Ceq.) of less than 0.40%, which is shown in the expression: Ceq.=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14; has C/(Mo+Ti+Nb+V) of 0.5-3.0 by atom.%, which is a ratio of C quantity of the total quantity of Mo, Ti, Nb and V; and has fine precipitates containing Ti and Mo with the sizes of less than 10 nm dispersed in a matrix substantially consisting of ferrite. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种具有高强度接头的钢板桩，其通过使用指定的拉伸试验的圆棒试验片进行试验时，其屈服强度为510MPa以上，总伸长率为17％以上在JIS14A中，作为接头的拉伸性能。解决方案：该钢板桩具有包含0.02-0.08％C，0.01-0.50％Si，0.5-1.8％Mn，0.01％以下P，0.01以下S，0.05〜0.50％Mo，0.005〜 0.04％Ti，0.01-0.07％Al，另外至少一种0.005-0.05％Nb和0.005-0.10％V（以质量％计），余量基本上为Fe; 具有小于0.40％的碳当量（Ceq。），如Ceq。= C + Mn / 6 + Si / 24 + Ni / 40 + Cr / 5 + Mo / 4 + V / 14所示。具有0.5-3.0原子％的C /（Mo + Ti + Nb + V）％，这是Mo，Ti，Nb和V的总量的C量的比率; 并且具有分散在基本上由铁素体组成的基质中的小于10nm的Ti和Mo的微细析出物。版权所有（C）2004，JPO

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