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1. 发明申请

US20100193087A1 MARTENSITIC STAINLESS STEEL SEAMLESS PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD FOR MANUFACTURING THE SAME 审中-公开
标题翻译：用于油类国家管材的MARTENSITIC不锈钢无缝管及其制造方法
公开(公告)号：US20100193087A1
公开(公告)日：2010-08-05
申请号：US12665097
申请日：2007-10-10
申请人： Yukio Miyata , Mitsuo Kimura , Masahito Tanaka , Ken Shimamoto
发明人： Yukio Miyata , Mitsuo Kimura , Masahito Tanaka , Ken Shimamoto
IPC分类号： C21D9/08 , C22C38/58 , C22C38/40 , C22C38/02
CPC分类号： C21D9/14 , C21D1/22 , C21D6/004 , C21D8/105 , C21D9/08 , C21D2211/008 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/40 , C22C38/58
摘要： A seamless steel pipe for oil country tubular goods which simultaneously has a high strength of a 110 ksi grade of yield strength and a superior low temperature toughness and a method for manufacturing the same are provided. A quenching treatment is performed on a stainless steel seamless pipe having a composition which contains on a mass percent basis, less than 0.010% of C, 1.0% or less of Si, 0.1% to 2.0% of Mn, 0.020% or less of P, 0.010% or less of S, 0.10% or less of Al, 10% to 14% of Cr, 0.1% to 4.0% of Ni, 0.05% or less of N, and the balance being Fe and inevitable impurities in which after heating is performed to a heating temperature for quenching equivalent to or more than the Ac3 transformation point, cooling is performed to a temperature range of 100° C. or less at a cooling rate equivalent to or more than that of air cooling; and following the quenching treatment, a tempering treatment is performed in which heating is performed to a tempering temperature in the range of more than 450° C. to 550° C., and cooling is then performed.
摘要翻译：提供一种同时具有110ksi级的屈服强度和优异的低温韧性的高强度的用于油井管状物品的无缝钢管及其制造方法。在具有以质量％计含有小于0.010％C，1.0％以下Si，0.1％〜2.0％Mn，0.020％以下P组成的不锈钢无缝管的淬火处理，S：0.010％以下，Al：0.10％以下，Cr：10〜14％，Ni：0.1〜4.0％，N：0.05以下，余量：Fe和不可避免的杂质进行等于或大于Ac3相变点的淬火加热温度，以等于或大于空气冷却的冷却速度进行冷却至100℃以下的温度范围; 在淬火处理之后，进行回火处理，其中进行加热至超过450℃至550℃范围内的回火温度，然后进行冷却。

2. 发明授权

US08512487B2 Seamless expandable oil country tubular goods and manufacturing method thereof 有权
标题翻译：无缝膨胀油国家管状物品及其制造方法
公开(公告)号：US08512487B2
公开(公告)日：2013-08-20
申请号：US10573277
申请日：2004-10-18
申请人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
发明人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
IPC分类号： C21D9/08
CPC分类号： C22C38/02 , C21D1/185 , C21D1/28 , C21D8/10 , C21D2211/005 , C22C38/08 , C22C38/22 , C22C38/38 , Y10T428/12
摘要： A seamless expandable oil country tubular article, which has a superior pipe expansion property in a expanding process at an expand ratio of more than about 30% although having a high strength such as a tensile strength (TS) of about 600 MPa or more, and a manufacturing method thereof, the seamless expandable oil country tubular goods being in an as-rolled state or being processed, optionally necessary, by inexpensive nonthermal-refining type heat treatment.
摘要翻译：一种无缝可膨胀油状国产管状制品，虽然具有约600MPa以上的抗拉强度（TS）等高强度，但膨胀率大于约30％的膨胀过程具有优异的管膨胀特性，其制造方法，无缝可膨胀油国家管状物品处于轧制状态或通过廉价的非热精炼型热处理任选需要加工。

3. 发明申请

US20070116975A1 Seamless expandable oil country tubular goods and manufacturing method thereof 有权
标题翻译：无缝膨胀油国家管状物品及其制造方法
公开(公告)号：US20070116975A1
公开(公告)日：2007-05-24
申请号：US10573277
申请日：2004-10-18
申请人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
发明人： Yoshio Yamazaki , Yukio Miyata , Mitsuo Kimura , Kei Sakata , Masahito Tanaka
IPC分类号： B22D7/00
CPC分类号： C22C38/02 , C21D1/185 , C21D1/28 , C21D8/10 , C21D2211/005 , C22C38/08 , C22C38/22 , C22C38/38 , Y10T428/12
摘要： The present invention provides a seamless expandable oil country tubular goods, which has a superior pipe expansion property in a expanding process at an expand ratio of more than 30% although having a high strength such as a tensile strength (TS) of 600 MPa or more, and a manufacturing method thereof, the seamless expandable oil country tubular goods being in an as-rolled state or being processed, whenever necessary, by inexpensive nonthermal-refining type heat treatment. In a particular product, 0.010% to less than 0.10% of C, 0.05% to 1% of Si, 0.5% to 4% of Mn, 0.03% or less of P, 0.015% or less of S, 0.01% to 0.06% of Al, 0.007% or less of N, and 0.005% or less of O are contained, and at least one of Nb, Mo, and Cr is contained in the range of 0.01% to 0.2% of Nb, 0.05% to 0.5% of Mo, and 0.05% to 1.5% of Cr, so that Mn+0.9×Cr+2.6×Mo≧2.0 and 4×C−0.3×Si+Mn+1.3×Cr+1.5×Mo≦4.5 are satisfied. The micro-structure of a steel pipe preferably contains ferrite at a volume fraction of 5% to 70%, and the balance is substantially composed of a low temperature-transforming phase. The manufacturing condition includes at least one of a: a rolling finish temperature of 800° C. or more in pipe forming, b: normalizing treatment after pipe forming, and c: holding of a steel pipe in a dual-phase region for five minutes or more after pipe forming, followed by air cooling.
摘要翻译：本发明提供一种无缝可膨胀油田国家管件，其膨胀率大于30％时的膨胀过程具有优良的管膨胀特性，尽管其抗拉强度（TS）为600MPa以上的高强度及其制造方法，无缝可膨胀油国家管状物品如果需要，通过廉价的非热精炼型热处理，处于轧制状态或被加工。在特定的产品中，C：0.010〜小于0.10％，Si：0.05〜1％，Mn：0.5〜4％，P：0.03％以下，S：0.015％以下，S：0.01〜0.06％的Al，0.007％以下的N和0.005％以下的O，Nb，Mo，Cr中的至少一种含有Nb的0.01〜0.2％的范围，0.05〜0.5％的Mo和0.05〜1.5％的Cr，使得满足Mn + 0.9xCr + 2.6×Mo> = 2.0和4×C-0.3×Si + Mn + 1.3×Cr + 1.5×Mo <= 4.5。钢管的微结构优选含有体积分数为5〜70％的铁素体，余量基本上由低温转化相组成。制造条件包括以下中的至少一个：成形中的轧制终轧温度为800℃以上，b：成形后的规范化处理，以及c：在双相区域内保持钢管5分钟或更多，然后进行空气冷却。

4. 发明申请

US20110132501A1 MARTENSITIC STAINLESS STEEL SEAMLESS TUBE FOR OIL COUNTRY TUBULAR GOODS AND MANUFACTURING METHOD THEREOF 审中-公开
标题翻译：用于油类管状产品的MARTENSITIC不锈钢无缝管及其制造方法
公开(公告)号：US20110132501A1
公开(公告)日：2011-06-09
申请号：US13059504
申请日：2008-12-24
申请人： Kenichiro Eguchi , Yukio Miyata , Mitsuo Kimura
发明人： Kenichiro Eguchi , Yukio Miyata , Mitsuo Kimura
IPC分类号： C21D9/08 , C21D11/00 , C22C38/18 , C22C38/48 , C22C38/42 , C22C38/46 , C22C38/50
CPC分类号： C22C38/26 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/48
摘要： A martensitic stainless steel seamless tube for oil country tubular goods includes a yield strength of 95 ksi or more and low-temperature toughness in which a fracture transition temperature vTrs in a Charpy impact test is −40° C. or below, wherein the seamless tube has a composition comprising, by mass %, 0.020% or less C, 10 to 14% Cr, 3% or less Ni, 0.03 to 0.2% Nb, 0.05% or less N, and Fe and unavoidable impurities as a balance, and has a structure where a precipitated Nb quantity is 0.020% or more in terms of Nb.
摘要翻译：一种用于油井管材的马氏体不锈钢无缝管包括屈服强度为95ksi或更高的屈服强度以及夏比冲击试验中的断裂转变温度vTrs为-40℃或更低的低温韧性，其中无缝管具有以质量％计含有0.020％以下的C，10〜14％的Cr，3％以下的Ni，0.03〜0.2％的Nb，0.05％以下的N，Fe和不可避免的杂质作为平衡，析出的Nb量以Nb计为0.020％以上的结构。

5. 发明授权

US06846371B2 Method for making high-strength high-toughness martensitic stainless steel seamless pipe 有权
标题翻译：制造高强度高韧性马氏体不锈钢无缝管的方法
公开(公告)号：US06846371B2
公开(公告)日：2005-01-25
申请号：US10226916
申请日：2002-08-23
申请人： Yukio Miyata , Mitsuo Kimura , Takaaki Toyooka
发明人： Yukio Miyata , Mitsuo Kimura , Takaaki Toyooka
IPC分类号： B21B3/02 , B21B23/00 , C21D8/10 , C22C38/18 , C22C38/40
CPC分类号： C22C38/40 , B21B3/02 , B21B23/00 , B21B2201/16 , C21D8/105 , C22C38/18
摘要： A method of producing a high-strength high-toughness martensitic stainless steel seamless pipe which includes heating a martensitic stainless steel raw material to an austenitic range and subjecting the raw material to piercing and elongating to form an original pipe. The original pipe is cooled to form a structure substantially composed of martensite in the original pipe. The original pipe is reheated to a temperature in the dual-phase range between the Ac1 transformation point and the Ac3 transformation point, and is subjected to finishing rolling at an initial rolling temperature T (° C.) between the Ac1 transformation point and the Ac3 transformation point. The original pipe is then cooled to form a processed pipe. The processed pipe is tempered at a temperature below the Ac1 transformation point. The reduction in area R in the finishing rolling step may be in the range of 10% to 90%, and the initial rolling temperature T and the reduction in area R may satisfy the relationship 800≦T−0.625R≦850.
摘要翻译：一种高强度高韧性马氏体不锈钢无缝管的制造方法，其特征在于，将马氏体系不锈钢原料加热至奥氏体系，对所述原料进行穿孔拉伸，形成原料管。原管被冷却以在原管中形成基本上由马氏体组成的结构。将原管再次加热到Ac1相变点和Ac3相变点之间的双相范围内的温度，并在Ac1相变点和Ac3之间的初始轧制温度T（℃）下进行精轧转型点。然后将原管冷却以形成加工管。处理后的管道在低于Ac1相变点的温度下回火。精轧步骤中的面积R的减少可以在10％至90％的范围内，并且初始轧制温度T和面积R的减小可以满足关系800 <= T-0.625R <= 850。

6. 发明授权

US5985209A Martensitic steel for line pipe having excellent corrosion resistance and weldability 失效
标题翻译：管线管马氏体钢具有优良的耐腐蚀性和焊接性
公开(公告)号：US5985209A
公开(公告)日：1999-11-16
申请号：US821512
申请日：1997-03-21
申请人： Mitsuo Kimura , Yukio Miyata , Tomoya Koseki , Takaaki Toyooka , Fumio Murase
发明人： Mitsuo Kimura , Yukio Miyata , Tomoya Koseki , Takaaki Toyooka , Fumio Murase
IPC分类号： C22C38/00 , C22C38/44 , C22C38/58 , C22C38/42
CPC分类号： C22C38/44
摘要： A martensitic steel for a line pipe having excellent corrosion resistance and weldability is disclosed. The martensitic steel contains about:0.02 wt % or less of C, 0.50 wt % or less of Si,0.2 to 3.0 wt % of Mn, 10 to 14 wt % of Cr,0.2 to 7.0 wt % of Ni, 0.2 to 5.0 wt % of Mo,0.1 wt % or less of Al, 0.07 wt % or less of N, andthe balance being Fe and incidental impurities; andthese elements satisfy substantially the following equations:(Cr %)+(Mo %)+0.1(N %)-3(C %).gtoreq.12.2,(Cr %)+3.5(Mo %)+10(N %)+0.2(Ni %)-20(C %).gtoreq.14.5, and150(C %)+100(N %)-(Ni %)-(Mn %).ltoreq.4.The martensitic steel may further contain at least one element selected from the group consisting ofabout 2.0 wt % or less of Cu, about 0.15 wt % or less of Ti, about 0.15 wt % or less of Zr, about 0.15 wt % or less of Ta andabout 0.006 wt % or less of Ca, andthese elements satisfy substantially the following equations:(Cr %)+(Mo %)+0.1(N %)+3(Cu %)-3(C %).gtoreq.12.2,(Cr %)+3.5(Mo %)+10(N %)+0.2(Ni %)-20(C %).gtoreq.14.5,150(C %)+100(N %)-(Ni %)-(Mn %).ltoreq.4.
摘要翻译：公开了一种具有优异的耐腐蚀性和焊接性的线管的马氏体钢。马氏体钢的含量为：0.02重量％以下的C，0.50重量％以下的Si，0.2〜3.0重量％的Mn，10〜14重量％的Cr，0.2〜7.0重量％的Ni，0.2〜5.0重量％的Mo，0.1重量％以下的Al，0.07重量％以下的N，余量为Fe和附带的杂质; 这些元素基本上满足以下等式：（Cr％）+（Mo％）+ 0.1（N％）-3（C％）> / = 12.2，（Cr％）+ 3.5（Mo％）+ 10（N％）+0.2（Ni％）-20（C％）> / = 14.5,150（C％）+ 100（N％） - （Ni％） - （Mn％）4。马氏体钢还可以含有选自Cu：2.0重量％以下，Ti：0.15重量％以下，Zr：0.15重量％以下，Zr：0.15重量％以下，0.15重量％以下 Ta和约0.006重量％以下的Ca，这些元素基本上满足以下等式：（Cr％）+（Mo％）+ 0.1（N％）+ 3（Cu％）-3（C％）> 12.2，（Cr％）+ 3.5（Mo％）+10（N％）+ 0.2（Ni％）-20（C％）> = 14.5,150（C％）+ 100（N％） - （Ni％） - （Mn％）

7. 发明授权

US5858128A High chromium martensitic steel pipe having excellent pitting resistance and method of manufacturing 失效
标题翻译：具有优异耐点蚀性的高铬马氏体钢管及其制造方法
公开(公告)号：US5858128A
公开(公告)日：1999-01-12
申请号：US634860
申请日：1996-04-19
申请人： Yukio Miyata , Mitsuo Kimura , Tomoya Koseki , Takaaki Toyooka , Fumio Murase
发明人： Yukio Miyata , Mitsuo Kimura , Tomoya Koseki , Takaaki Toyooka , Fumio Murase
IPC分类号： C21D1/18 , C21D6/00 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/42 , C22C38/58 , C22C38/18
CPC分类号： C21D8/105 , C21D6/002 , C21D9/08 , C22C38/001 , C22C38/42 , C22C38/58 , C21D1/18 , C21D2211/008 , C21D6/004
摘要： A high-Cr martensitic steel pipe having excellent pitting resistance and method for manufacturing the same, which involves forming a pipe of steel including C: about 0.03 wt % or less, Si: about 0.5 wt % or less, Mn: about 0.5-3.0 wt %, Cr: about 10.0-14.0 wt %, Ni: about 0.2-2.0 wt %, Cu: about 0.2-1.0 wt % and N: about 0.03 wt % or less with the balance being Fe and incidental impurities, and having a value X shown as defined in the following formula (1) of about 12.2 or more. The pipe is quenched after austenitizing it at a temperature substantially equal to an Ac.sub.3 point or higher, and the pipe is tempered in a temperature range from about 550.degree. C. or higher to a temperature lower than an Ac.sub.1 point.value X=(Cr %)+3(Cu %)-3(C %) (1)The high-Cr martensitic steel pipe made by this method exhibits excellent pitting resistance and general corrosion resistance even in an environment containing a carbonic acid gas, and further exhibits excellent weldability and toughness in the heat-affected zones.
摘要翻译：具有优异的耐点蚀性的高Cr马氏体钢管及其制造方法，其特征在于，包括形成C：约0.03重量％以下，Si：约0.5重量％以下，Mn：约0.5-3.0的钢管重量％，Cr：约10.0〜14.0重量％，Ni：约0.2〜2.0重量％，Cu：约0.2〜1.0重量％，N：约0.03重量％以下，余量为Fe及附带杂质，如下述式（1）所示的值X为约12.2以上。在基本等于Ac3点以上的温度奥氏体化之后，管道被淬火，并且在约550℃以上的温度范围内回火到低于Ac1点的温度。值X =（Cr ％）+ 3（Cu％）-3（C％）（1）通过该方法制造的高Cr马氏体钢管即使在含有碳酸气体的环境中也具有优异的耐点蚀性和一般的耐腐蚀性，并且还显示出优异的热影响区的焊接性和韧性。

8. 发明申请

US20090017238A1 Martensitic stainless steel pipe 有权
标题翻译：马氏体不锈钢管
公开(公告)号：US20090017238A1
公开(公告)日：2009-01-15
申请号：US10587807
申请日：2004-12-01
申请人： Yukio Miyata , Mitsuo Kimura , Noritsugu Itakura , Katsumi Masamura
发明人： Yukio Miyata , Mitsuo Kimura , Noritsugu Itakura , Katsumi Masamura
IPC分类号： B32B1/08 , C22C38/18 , C22C38/40 , C22C38/58 , C22C38/60 , C22C38/52 , C22C38/42 , C22C38/44
CPC分类号： C22C38/44 , C21D1/25 , C21D6/004 , C21D9/14 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/40 , C22C38/46 , C22C38/48 , C22C38/50 , Y10T428/13
摘要： A martensitic stainless steel pipe having a heat-affected zone with high resistance to intergranular stress corrosion cracking is provided. In particular, the martensitic stainless steel pipe contains less than 0.0100% of C; less than 0.0100% of N; 10% to 14% of Cr; and 3% to 8% of Ni on a mass basis. Alternatively, the martensitic stainless steel pipe may further contain Si, Mn, P, S, and Al within an appropriate content range. The martensitic stainless steel pipe may further contain one or more selected from the group consisting of 4% or less of Cu, 4% or less of Co, 4% or less of Mo, and 4% or less of W and one or more selected from the group consisting of 0.15% or less of Ti, 0.10% or less of Nb, 0.10% or less of V, 0.10% or less of Zr, 0.20% or less of Hf, and 0.20% or less of Ta on a mass basis. The content Csol defined by the following equation is equal to less than 0.0050%: Csol=C−⅓×Cpre, wherein Cpre=12.0{Ti/47.9+½(Nb/92.9+Zr/91.2)+⅓(V/50.9+Hf/178.5+Ta/180.9)−N/14.0} or Cpre=0 when Cpre
摘要翻译：提供具有耐晶间应力腐蚀开裂性高的热影响区的马氏体不锈钢管。特别地，马氏体不锈钢管含有小于0.0100％的C; 小于0.0100％的N; 10％〜14％的Cr; 和3％〜8％的Ni。或者，马氏体不锈钢管可以在适当的含量范围内进一步含有Si，Mn，P，S和Al。马氏体系不锈钢管可以进一步含有选自Cu，4％以下的Co，4％以下的Mo，4％以下的W和1种以上的选自Cu，4％以下的1种以上由Ti的0.15％以下，Nb：0.10％以下，V：0.10％以下，Zr：0.10％以下，Hf：0.20％以下，Ta：0.20％以下基础。 C sol = C-1 / 3xCpre，其中Cpre = 12.0 {Ti / 47.9 +½（Nb / 92.9 + Zr / 91.2）+1/3（V / 50.9 + Hf / 178.5 + Ta / 180.9）-N / 14.0}或Cpre = 0。

9. 发明授权

US06464802B1 High Cr steel pipe for line pipe 失效
标题翻译：高铬钢管线管
公开(公告)号：US06464802B1
公开(公告)日：2002-10-15
申请号：US09647530
申请日：2000-10-02
申请人： Yukio Miyata , Mitsuo Kimura , Takaaki Toyooka
发明人： Yukio Miyata , Mitsuo Kimura , Takaaki Toyooka
IPC分类号： C22C3840
CPC分类号： C22C38/42 , C21D8/105 , C21D9/08 , C22C38/001 , C22C38/004 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： A high-Cr steel pipe for line pipes having further improved HAZ toughness and hot workability is provided by limiting the composition to: C: 0.02% or less, Si: 0.5% or less, Mn: 0.2 to 3.0%, Cr: 10.0 to 14.0%, Ni: more than 2.0 to 3.0%, N: 0.02% or less, preferably Nb: 0.3% or less, and the balance being Fe and incidental impurities.
摘要翻译：通过将组合物的限制为：C：0.02％以下，Si：0.5％以下，Mn：0.2〜3.0％，Cr：10.0〜10，成为具有进一步提高的HAZ韧性和热加工性的管道用管道的高Cr钢管 14.0％，Ni：大于2.0〜3.0％，N：0.02％以下，优选Nb：0.3％以下，余量为Fe和杂质。

10. 发明授权

US6136109A Method of manufacturing high chromium martensite steel pipe having excellent pitting resistance 失效
标题翻译：具有优异耐点蚀性的高铬马氏体钢管的制造方法
公开(公告)号：US6136109A
公开(公告)日：2000-10-24
申请号：US181829
申请日：1998-10-28
申请人： Yukio Miyata , Mitsuo Kimura , Tomoya Koseki , Takaaki Toyooka , Fumio Murase
发明人： Yukio Miyata , Mitsuo Kimura , Tomoya Koseki , Takaaki Toyooka , Fumio Murase
IPC分类号： C21D1/18 , C21D6/00 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/42 , C22C38/58
CPC分类号： C21D8/105 , C21D6/002 , C21D9/08 , C22C38/001 , C22C38/42 , C22C38/58 , C21D1/18 , C21D2211/008 , C21D6/004
摘要： A high-Cr martensite steel pipe having excellent pitting resistance and method for manufacturing the same, which involves forming a pipe of steel including C: about 0.03 wt % or less, Si: about 0.5 wt % or less, Mn: about 0.5-3.0 wt %, Cr: about 10.0-14.0 wt %, Ni: about 0.2-2.0 wt %, Cu: about 0.2-1.0 wt % and N: about 0.03 wt % or less with the balance being Fe and incidental impurities, and having a value X shown as defined in the following formula (1) of about 12.2 or more. The pipe is quenched after austenitizing it at a temperature substantially equal to an A.sub.C3 point or higher, and the pipe is annealed in a temperature range from about 550.degree. C. or higher to a temperature lower than an A.sub.C1 point.value X=(Cr%)+3(Cu%)-3(C%) (1)The high-Cr martensite steel pipe made by this method exhibits excellent pitting resistance and overall surface corrosion resistance even in an environment containing a carbonic acid gas, and further exhibits excellent weldability and toughness in the welding-heat-affected zones.
摘要翻译：具有优异的耐点蚀性的高Cr马氏体钢管及其制造方法，其特征在于，包括形成C：约0.03重量％以下，Si：约0.5重量％以下，Mn：约0.5-3.0的钢管重量％，Cr：约10.0〜14.0重量％，Ni：约0.2〜2.0重量％，Cu：约0.2〜1.0重量％，N：约0.03重量％以下，余量为Fe及附带杂质，如下述式（1）所示的值X为约12.2以上。在基本上等于AC3点以上的温度奥氏体化后，管道淬火，管道在约550℃以上至低于AC1点的温度范围内进行退火。值X =（Cr ％）+ 3（Cu％）-3（C％）（1）通过该方法制造的高Cr马氏体钢管即使在含有碳酸气体的环境中也具有优异的耐点蚀性和整体表面耐腐蚀性，焊接热影响区的焊接性和韧性优良。

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