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1. 发明专利

JP2008291363A Ferritic heat resistant steel having excellent creep property in weld heat-affected zone, and heat resistant structure 有权
标题翻译：焊接热影响区具有优异的蠕变性能的耐热钢，耐热结构
公开(公告)号：JP2008291363A
公开(公告)日：2008-12-04
申请号：JP2008117899
申请日：2008-04-28
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HASEGAWA HIROSHI , MURAKI TARO
IPC分类号： C22C38/00 , C22C38/28 , C22C38/52
摘要： PROBLEM TO BE SOLVED: To provide a ferritic heat resistant steel in which Type 4 damage is suppressed in HAZ, and to provide a heat resistant structure. SOLUTION: Regarding the ferritic heat resistant steel member having a composition including 0.01 to 0.20% C, 0.02 to 0.50% Si, 0.05 to 1.0% Mn, ≤0.02% P, ≤0.01% S, 0.4 to 12.0% Cr and 0.002 to 0.15% N, one or more kinds selected from 0.05 to 2.0% Mo, 0.05 to 3.0% W and 0.05 to 2.0% Re and one or more kinds selected from 0.01 to 0.20% Ti, 0.003 to 0.20% Zr, 0.01 to 0.50% Nb, 0.01 to 0.50% V and 0.01 to 0.15% Ta and having a HAZ hardenability index of 0.5 to 80, a low temperature transformed structure is produced in the part to be heated to Ac 1 to Ac 1 +300°C, and, the occupancy ratio in grain boundary length of M 23 C 6 type carbides or the like in a large inclination angle grain boundary in the part reaches ≥30% by post-heat treatment at 300°C to Ac 1 . COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种在HAZ中抑制4型损伤并提供耐热结构的铁素体耐热钢。＆lt; P＆gt;解决方案：关于具有0.01至0.20％的C，0.02至0.50％的Si，0.05至1.0％的Mn，≤0.02％的P，≤0.01％的S，0.4至12.0％的Cr的组成的铁素体耐热钢构件，以及 0.002〜0.15％的N，选自0.05〜2.0％的Mo，0.05〜3.0％的W和0.05〜2.0％的Re中的一种或多种，Ti：0.00〜0.20％，Ti：0.003〜0.20％，0.01〜 0.50％Nb，0.01〜0.50％V和0.01〜0.15％Ta，HAZ淬透性指数为0.5〜80，在被加热部分中产生低温变形结构为Ac 1 ， Ac 1 + 300℃，并且在大尺寸的M / SB> 13 6 型碳化物等的晶界长度的占有率通过在300℃至Ac 1 的后热处理，该部分的倾斜角晶界达到≥30％。版权所有（C）2009，JPO＆INPIT

2. 发明专利

JP2008202128A Oil well electric resistance welded pipe for expansion having excellent expansion performance and corrosion resistance, and method for manufacturing the same 有权
标题翻译：具有良好的膨胀性能和耐腐蚀性的膨胀用耐油性电焊管及其制造方法
公开(公告)号：JP2008202128A
公开(公告)日：2008-09-04
申请号：JP2007042288
申请日：2007-02-22
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MURAKI TARO , ASAHI HITOSHI , TSUGIHARA HIDEFUMI , IWAMOTO SHUJI
IPC分类号： C22C38/00 , B21D22/20 , C21D9/08 , C21D9/50 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide an oil well electric resistance welded pipe for expansion which can be expanded at a high expanding ratio, and has excellent sulfide stress cracking resistance after expansion in a corrosive environment in an oil well, and to provide a method for manufacturing the same. SOLUTION: The oil well electric resistance welded pipe for expansion having excellent expansion performance and corrosion resistance has a composition comprising, by mass, 0.01 to 0.3% C, 0.01 to 0.7% Si, 0.5 to 2.0% Mn, 0.005 to 0.1% Nb, 0.005 to 0.05% Ti, 0.002 to 0.1% Al and 0.0005 to 0.008% Ca, and in which the content of P is limited to ≤0.10%, S to ≤0.005% and O to ≤0.0040%, and Si/Mn satisfies 0.005 to 1.5, and the balance Fe with inevitable impurities. Preferably, the steel pipe comprises ≤0.5% Cr, and satisfies Si/(Mn+Cr): 0.005 to 1.5. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供一种能够以高膨胀率膨胀的膨胀用油井电阻焊管，在油井的腐蚀性环境中膨胀后具有优异的耐硫化物应力开裂性，并且提供其制造方法。解决方案：具有优异的膨胀性能和耐腐蚀性的用于膨胀的油井电阻焊管具有质量分数为：含有0.01至0.3％的C，0.01至0.7％的Si，0.5至2.0％的Mn，0.005至0.1 ％Nb，0.005〜0.05％Ti，0.002〜0.1％Al和0.0005〜0.008％Ca，其中P含量限制在≤0.10％，S〜≤0.005％，O〜≤0.0040％，Si / Mn满足0.005〜1.5，余量为Fe与不可避免的杂质。优选钢管含有≤0.5％的Cr，并且满足Si /（Mn + Cr）：0.005〜1.5。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JP2010209461A High-strength steel sheet and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe 有权
标题翻译：高强度钢板和高强度钢管，具有优异的氢诱导抗裂性，适用于管线管
公开(公告)号：JP2010209461A
公开(公告)日：2010-09-24
申请号：JP2009253157
申请日：2009-11-04
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HARA TAKUYA , TERADA YOSHIO , MURAKI TARO , SUZUKI TAKESHI
IPC分类号： C22C38/00 , B21B3/00 , B21C37/08 , C22C38/14 , C22C38/58
CPC分类号： C22C38/02 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a steel sheet and a steel pipe having excellent HIC resistance that are ideal for, for instance, a line pipe used to convey petroleum or natural gas. SOLUTION: The steel sheet and the steel pipe are formed from steel having a steel composition that comprises, by mass, C: 0.02 to 0.08%, Si: 0.01 to 0.5%, Mn: 1.2 to 1.6%, Nb: 0.001 to 0.10%, N: 0.0010 to 0.0050%, Ca: 0.0001 to 0.0050%, P: 0.01% or less, S: 0.0020 or less, Ti: 0.030% or less, Al: 0.030% or less, and O: 0.0035% or less, and the balance Fe with inevitable impurities and that satisfies S/Ca COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供对于例如用于输送石油或天然气的管线管是理想的钢板和具有优异的耐HIC电阻的钢管。钢板和钢管由具有C：0.02〜0.08％，Si：0.01〜0.5％，Mn：1.2〜1.6％，Nb：0.001质量的钢组成的钢形成至0.10％，N：0.0010〜0.0050％，Ca：0.0001〜0.0050％，P：0.01％以下，S：0.0020以下，Ti：0.030％以下，Al：0.030％以下，O：0.0035％余量为Fe和不可避免的杂质，满足S / Ca <0.5，最大Mn偏析度为2.0％以下，最大Nb偏析度为4.0以下，最大Ti度为分离4.0以下。版权所有（C）2010，JPO＆INPIT

4. 发明专利

JP2010189720A Method of manufacturing sheet steel for sour-resistant line pipe 有权
标题翻译：生产线路钢管的方法
公开(公告)号：JP2010189720A
公开(公告)日：2010-09-02
申请号：JP2009035659
申请日：2009-02-18
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ASAHI HITOSHI , MURAKI TARO , SAWAMURA MITSURU , HARA TAKUYA
IPC分类号： C21D8/02 , B21B1/38 , B21B3/00 , C22C38/00 , C22C38/14 , C22C38/54
CPC分类号： C21D8/0226 , C21D8/0263 , C21D9/14 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a sheet steel for a line pipe having excellent sour resistance, which copes with fluctuation in the heating temperature of hot rolling and plate thickness since the temperature is easily dropped during the hot rolling when the heating temperature of a steel slab is dropped, or when the thickness of the sheet steel is small. SOLUTION: A steel slab contains C, Si, Mn, Nb and Ti while limiting Al, P and N, and further contains 0.001-0.004% Ca while limiting S to be ≤0.0008% and O to be ≤0.0030%, wherein the contents of Ca, O and S satisfy an inequality [Ca](1-124[O])/1.25[S]>3.0. After re-heating the steel slab at a temperature of 1,000-1,250°C, the steel slab is subjected to the rough-rolling, the finish rolling and the accelerated cooling. The accelerated cooling starting temperature Tc and the ratio [C/Mn] of the C amount to the Mn amount satisfy the inequalities 4≤Tc×[C/Mn]≤32. The accelerated cooling rate is set to be 10-40°C/s, and the stop temperature of the accelerated cooling is set to be 200-500°C. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：解决的问题：提供一种具有优异耐酸性的管线管用钢板的制造方法，其能够应对热轧时的热轧温度和板厚度的变动，因为在热轧期间温度容易下降当钢板的加热温度下降时，或者当钢板的厚度小时。
解决方案：钢板含有C，Si，Mn，Nb和Ti，同时限制Al，P和N，并且进一步含有0.001-0.004％的Ca，同时限制S为≤0.0008％，O为≤0.0030％其中Ca，O和S的含量满足不等式[Ca]（1-124 [O]）/ 1.25 [S]> 3.0。在1000-1,250℃的温度下对钢坯进行再加热后，对钢坯进行粗轧，精轧，加速冷却。加速冷却起始温度Tc和C量与Mn量的比[C / Mn]满足不等式4≤Tc×[C / Mn]≤32。将加速冷却速度设定为10-40℃/ s，将加速冷却的停止温度设定为200〜500℃。版权所有（C）2010，JPO＆INPIT

5. 发明专利

JP2008266786A Heat-resistant ferritic steel material superior in creep characteristics at weld heat-affected zone, and heat-resistant structure 有权
标题翻译：焊接热影响区的耐热特性钢材料耐高温特性及耐热结构
公开(公告)号：JP2008266786A
公开(公告)日：2008-11-06
申请号：JP2008084695
申请日：2008-03-27
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HASEGAWA HIROSHI , MURAKI TARO
IPC分类号： C22C38/00 , C21D1/26 , C21D6/00 , C21D9/50 , C22C38/28 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a heat-resistant structure which inhibits a type-IV damage from occurring at a weld heat-affected zone of a heat-resistant ferritic steel material.
SOLUTION: The heat-resistant ferritic steel material includes, by mass%, 0.01-0.20% C, 0.02-0.50% Si, 0.05-1.0% Mn, 0.02% or less P, 0.01% or less S, 0.4-12.0% Cr, 0.002-0.15% N, one or more elements of 0.01-0.20% Ti, 0.003-0.20% Zr, 0.01-0.50% Nb, 0.01-0.50% V, and 0.01-0.15% Ta, and the balance Fe with unavoidable impurities, and has a Cr equivalent value of 0.4 to 20 at the weld heat-affected zone; and has such superior creep characteristics at the weld heat-affected zone that a low temperature transformation structure having former γ grains with average particle sizes of 10 μm or larger is formed (z) in the weld heat-affected zone of the steel material to be heated to the Ac
1 transformation temperature to (the Ac
1 transformation temperature +300°C).
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种在耐热铁素体钢材料的焊接热影响区域发生抑制IV型损伤的耐热结构。解决方案：耐热铁素体钢材料以质量％计含有0.01-0.20％C，0.02-0.50％Si，0.05-1.0％Mn，0.02％以下P，0.01％以下S，0.4〜 12.0％Cr，0.002-0.15％N，0.01-0.20％Ti，0.003-0.20％Zr，0.01-0.50％Nb，0.01-0.50％V和0.01-0.15％Ta中的一种或多种元素，余量为Fe 不可避免的杂质，焊接热影响区的Cr当量值为0.4〜20; 并且在焊接热影响区具有如此优异的蠕变特性，在钢材的焊接热影响区形成具有平均粒径为10μm以上的前γ粒子的低温相变结构（z）加热至Ac 1 转变温度至（Ac 1 转变温度+ 300℃）。版权所有（C）2009，JPO＆INPIT

6. 发明专利

JP2004359991A Method of manufacturing high-strength low-alloy boiler steel of excellent creep characteristic 有权
公开(公告)号：JP2004359991A
公开(公告)日：2004-12-24
申请号：JP2003158137
申请日：2003-06-03
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MURAKI TARO , ASAHI HITOSHI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing boiler steel which has excellent creep characteristics and is used under high-temperature and high-pressure environment with any heat treatment step omitted from the method.
SOLUTION: In the method for manufacturing high-strength low-alloy boiler steel which has excellent creep characteristics, a steel slab containing C, Si, Mn, P, S, O, N and Al of an adequate amount and further containing one or two or more kinds of Nb, V and Ti with the balance Fe with inevitable impurities is heated at 1,100 to 1,280°C, subjected to hot rolling at a temperature of 850 to 1,080°C with the accumulated draft of ≥ 80%, and wound at the temperature of 450 to 630°C after water cooling or air cooling. The steel may further contain one or two or more kinds of Cr, Cu, Ni, Co, Mo, W, B, La, Ca, Y, Ce, Zr, Ta, Hf, Re, Pt, Ir, Pd and Sb.
COPYRIGHT: (C)2005,JPO&NCIPI

7. 发明专利

JP2010189722A Method of manufacturing sheet steel for thick-walled sour-resistant line pipe of excellent toughness 有权
标题翻译：厚壁耐腐蚀管线管制造优质钢材的方法
公开(公告)号：JP2010189722A
公开(公告)日：2010-09-02
申请号：JP2009035752
申请日：2009-02-18
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ASAHI HITOSHI , MURAKI TARO , SAWAMURA MITSURU , HARA TAKUYA
IPC分类号： C21D8/02 , B21B1/38 , B21B3/00 , C22C38/00 , C22C38/14 , C22C38/54
CPC分类号： C22C38/02 , C21D8/0226 , C21D8/0263 , C21D9/08 , C21D9/14 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a sheet steel for a line pipe having the excellent sour resistance, which achieves combination of the sour resistance characteristic with the drop weight tear characteristic of a sheet steel having a thickness of ≥25 mm.
SOLUTION: A steel slab contains C, Si, Mn, Nb and Ti while limiting Al, P and N, and further contains 0.001-0.004% Ca while limiting S to be ≤0.0008% and O to be ≤0.0030%, wherein the contents of Ca, O and S satisfy an inequality [Ca](1-124[O])/1.25[S]>3.0. After heating the steel slab at the heating temperature T1 within 1,000-1,150°C, and satisfying an inequality T1≥-7970/(log([Nb]×[C])-3.31)-170, the steel slab is subjected to the rough-rolling, the finish rolling and the accelerated cooling. In the finish rolling, the finish rolling temperature is set to be ≥800°C and the draft at a temperature of ≤950°C is set to be ≥3 so that the plate thickness is ≥25 mm. The accelerated cooling rate is set to be 10-30°C/s, and the stop temperature of the accelerated cooling is set to be 200-500°C.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：解决问题的方案为了提供一种具有优异耐酸性的管线管用钢板的制造方法，其特征在于，将耐酸性特性与厚度≥3mm的钢板的液滴重量撕裂特性相结合， 25毫米。
解决方案：钢板含有C，Si，Mn，Nb和Ti，同时限制Al，P和N，并且进一步含有0.001-0.004％的Ca，同时限制S为≤0.0008％，O为≤0.0030％其中Ca，O和S的含量满足不等式[Ca]（1-124 [O]）/ 1.25 [S]> 3.0。在1000-1,150℃之间的加热温度T1下加热钢坯，满足T1≥-7970 /（log（[Nb]×[C]） - 3.31）-170的不等式，钢坯经受粗轧，精轧和加速冷却。在精轧中，精轧温度设定为≥800℃，并且在≤950℃的温度下的通风设定为≥3，使得板厚度≥25mm。将加速冷却速度设定为10〜30℃/ s，将加速冷却的停止温度设定为200〜500℃。版权所有（C）2010，JPO＆INPIT

8. 发明专利

JP2008291360A Ferritic heat resistant steel having excellent creep property in welded heat-affected zone, and heat resistant structure 有权
标题翻译：焊接热影响区具有优异的蠕变性能的耐热耐热钢，耐热结构
公开(公告)号：JP2008291360A
公开(公告)日：2008-12-04
申请号：JP2008116195
申请日：2008-04-25
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HASEGAWA HIROSHI , MURAKI TARO
IPC分类号： C22C38/00 , C22C38/28 , C22C38/52
摘要： PROBLEM TO BE SOLVED: To provide a ferritic heat resistant steel in which the generation of IV type damage is suppressed in the weld heat-affected zone.
SOLUTION: The ferritic heat resistant steel is composed of a steel including 0.01 to 0.20% C, 0.02 to 0.50% Si, 0.05 to 1.0% Mn, ≤0.02% P, ≤0.01% S, 0.4 to 12.0% Cr, 0.002 to 0.15% N and one or more kinds selected from 0.01 to 0.20% Ti, 0.003 to 0.20% Zr, 0.01 to 0.50% Nb, 0.01 to 0.50% V and 0.01 to 0.50% Ta, in which welded heat affected zone hardenability index HD is 0.5 to 80. In the welded heat affected zone of the steel member heated to an Ac1 transformation point to an Ac
1 transformation point +300°C, a low temperature transformed structure where dislocation density is 1×10
12 pieces/m
2 or above (Cr: 0.4 to 3.0%) or 1×10
13 pieces/m
2 or above (Cr: >3.0 to 12.0%) is produced.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供在焊接热影响区域中抑制IV型损伤的产生的铁素体耐热钢。铁素体系耐热钢由含有0.01〜0.20％的C，0.02〜0.50％的Si，0.05〜1.0％的Mn，≤0.02％的P，≤0.01％的S，0.4〜12.0％的Cr， 0.002〜0.15％的N和选自0.01〜0.20％的Ti，0.003〜0.20％的Zr，0.01〜0.50％的Nb，0.01〜0.50％的V和0.01〜0.50％的Ta的一种或多种，其中焊接热影响区淬透性指数 HD为0.5〜80。在被加热至Ac1相变点的钢构件的焊接热影响区域中，相对于Ac 1 相变点+ 300℃，位错密度为1的低温变形结构 ×10 12 / m 2 以上（Cr：0.4〜3.0％）或1×10 SP / 以上（Cr：> 3.0〜12.0％）。版权所有（C）2009，JPO＆INPIT

9. 发明专利

JP2006077330A Boiler steel with excellent electric weldability, and electric welded boiler steel pipe using the same 有权
标题翻译：具有优良电气焊接性的锅炉钢和使用其的电焊锅炉钢管
公开(公告)号：JP2006077330A
公开(公告)日：2006-03-23
申请号：JP2005307722
申请日：2005-10-21
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MURAKI TARO , HASEGAWA HIROSHI , OKAMOTO JUNICHI
IPC分类号： C22C38/00 , C21D6/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide steel for electric welded boiler which exhibits high creep rupture strength on the high-temperature long-time side and is minimal in defects in an electric welded zone and excellent in electric weldability and also to provide a steel pipe using the same.
SOLUTION: The steel has a composition which contains, by mass, 0.01 to 0.20% C, 0.01 to 1.0% Si, 0.10 to 2.0% Mn and 0.5 to 3.5% Cr, also contains P, S and O limited to ≤0.030%, ≤0.010% and ≤0.020%, respectively, and has the balance Fe with inevitable impurities and in which the mass ratio of Si, Mn and Cr ranges from 0.005 to 1.5 in terms of the value of (Si%)/(Mn%+Cr%). Further, the melting point of a ternary mixed oxide consisting of SiO
2 , MnO and Cr
2 O
3 present in the steel is made to ≤1,600°C. As the result, the oxide causing the defects in the electric welded zone at electric welding can be melted and squeezed out as slag components. Therefore, the steel for electric welded boiler minimal in welding defects and excellent in electric weldability and also the electric welded boiler steel pipe using the steel and having excellent creep rupture strength and toughness can be obtained.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供在高温长时间侧具有高蠕变断裂强度的电焊锅炉用钢，电焊接区域的缺陷小，电焊接性优异，钢管使用相同。钢的组成为含有0.01〜0.20％的C，0.01〜1.0％的Si，0.10〜2.0％的Mn和0.5〜3.5％的Cr，也含有P，S和O的含量为≤ 0.030％，≤0.010％，≤0.020％，余量为Fe和不可避免的杂质，其中Si，Mn和Cr的质量比为（Si％）/（的Mn％+的Cr％）。此外，钢中存在的由SiO 2 ，MnO和Cr 2 O 3 组成的三元混合氧化物的熔点为≤ 1600℃。结果，导致电焊接区域的电焊接的缺陷的氧化物可以熔融并作为炉渣成分挤出。因此，可以获得电焊锅炉用电焊接缺陷小，电焊接性优异的电焊锅炉钢管，并且具有优异的蠕变断裂强度和韧性。版权所有（C）2006，JPO＆NCIPI

10. 发明专利

JP2005290526A Ferritic electric resistance welded boiler steel tube having excellent weld zone reheat crack resistance and manufacturing method 有权
标题翻译：具有良好焊接区域的耐电焊丝焊接钢管抗裂性和制造方法
公开(公告)号：JP2005290526A
公开(公告)日：2005-10-20
申请号：JP2004111384
申请日：2004-04-05
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MURAKI TARO , ASAHI HITOSHI , SOENO AKIO
IPC分类号： B21C37/08 , B23K9/025 , B23K31/00 , C21D9/08 , C21D9/50 , C22C38/00 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a ferritic electric resistance welded boiler steel tube which exhibits high creep rupture strength on a high-temperature and long-time side, has excellent electric resistance weldability, and has excellent weld zone reheat crack resistance and a manufacturing method.
SOLUTION: The ferritic electric resistance welded boiler steel tube which has the excellent weld zone reheat crack resistance contains, by weight %, 0.005 to 0.20% C, 0.001 to 1.5% Si, 0.05 to 2.0% Mn, 0.25 to 3.5% Cr, 0.01% to 2.0% Mo, 0.001 to 0.3% O, ≤0.01% Al, 0.001 to 0.1% N, further contains one or two or more kinds of 0.001 to 0.5% Nb, 0.02 to 1.0% V, and 0.0002 to 0.002% B, is limited to ≤0.030% P and ≤0.010% S, and consists of the balance Fe and inevitable impurities, wherein the defect area rate of the electric resistance weld zone attains ≤0.1%.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：解决的问题：为了提供在高温长时间侧具有高蠕变断裂强度的铁素体电阻焊锅炉钢管，具有优异的电阻可焊性，并且具有优异的焊接区再热裂纹性和一种制造方法。解决方案：焊接区再热裂纹性优异的铁素体电阻焊锅炉钢管以重量％计含有0.005〜0.20％C，0.001〜1.5％Si，0.05〜2.0％Mn，0.25〜3.5％ Cr，0.01〜2.0％的Mo，0.001〜0.3％的O，≤0.01％的Al，0.001〜0.1％的N，进一步含有0.001〜0.5％的Nb，0.02〜1.0％的V和0.0002〜 0.002％B限制在≤0.030％P和≤0.010％S，由余量Fe和不可避免的杂质构成，其中电阻焊接区的缺陷面积率达到0.1％以下。版权所有（C）2006，JPO＆NCIPI

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