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1. 发明专利

JP2008261011A Method for producing high strength steel having 470 mpa or more yield stress and 570 mpa or more tensile strength, and excellent in toughness of welding heat-affected part 有权
标题翻译：生产具有470MPa或更高应力的高强度钢的方法，以及570MPa或更高的拉伸强度，并且焊接热影响部分的韧性优异
公开(公告)号：JP2008261011A
公开(公告)日：2008-10-30
申请号：JP2007104944
申请日：2007-04-12
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MIZOGUCHI MASATAKE , HASEGAWA HIROSHI , FUJIOKA MASAAKI , HOSHINO MANABU , TANAKA YOICHI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a high strength steel having ≥470 MPa YS, ≥570 MPa TS and excellent in toughness of welding heat-affected part. SOLUTION: A steel slab containing, by mass, 0.005 to CM ≤0.20 and satisfies the relation of Ti/47.9≥N/14.0 and the balance Fe with inevitable impurities, is heated at 1,000-1,250°C, and the rolling is performed to Ar 3 point to 920°C, and when the rolling is finished, an accelerated cooling off ≥1 °C/sec is performed in the temperature range of 300 to COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供一种具有≥470MPa的YS，≥570MPa的TS和焊接热影响部分的韧性优异的高强度钢的方法。＆lt; P＆gt;解决方案：一种钢坯，其含有0.005-0.05％的C，<0.05％的Si，1.5-2.5％的Mn，0.02-0.08％的Nb，0.005-0.030％的Ti，0.0005-0.0020％的B，0.001 -0.01％Al，0.001-0.007％N，进一步分别为Mo，W和P CM ≤0.20的0.05-0.5％，满足Ti /47.9≥N/ 14.0，余量为不可避免的杂质的Fe被加热到1000-1,250℃，在920-120℃下进行轧制压下率<60％，轧制压下率≥30％ 3 指向920℃，当轧制结束时，在300至<550℃的温度范围内执行加速冷却≥1℃/秒，此后，进行冷却。版权所有（C）2009，JPO＆INPIT

2. 发明专利

JP2007302978A Method for manufacturing high-strength steel of tensile strength of 780 mpa class having excellent toughness of weld heat affected zone 有权
标题翻译：制造具有焊接热影响区优良韧性的780 MPA类的拉伸强度高强度钢的方法
公开(公告)号：JP2007302978A
公开(公告)日：2007-11-22
申请号：JP2006135086
申请日：2006-05-15
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MIZOGUCHI MASATAKE , FUJIOKA MASAAKI , HOSHINO MANABU , TANAKA YOICHI
IPC分类号： C21D8/02 , B21B3/00 , C22C38/00 , C22C38/12 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing high-strength steel of tensile strength of 780 MPa class having excellent toughness of a weld heat affected zone with unexperienced low alloy component and at high productivity.
SOLUTION: In themethod for manufacturing the high-strength steel of tensile strength of 780 MPa class having excellent toughness of the weld heat affected zone, a steel slab having the composition consisting of, by mass, ≥0.005% and 920°C is >60%, and the cumulative draft below Ar
3 point is 30-95%, and cooled after the rolling.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种抗拉强度为780MPa级的高强度钢的方法，该方法具有具有优异的低合金成分的焊接热影响区的优异的韧性并且以高的生产率。解决方案：在制造具有优异的焊接热影响区的韧性的780MPa级的高强度钢的制造方法中，具有以质量计≥0.005％和<0.030％的组成的钢坯， C，<0.05％Si，1.0-2.5％Mn，0.02-0.08％Nb，0.001-0.10％Al和0.0001〜≤0.01％N，焊接裂纹参数PCM≤0.25，余量为Fe的不可避免的杂质为加热至1,020-1,300℃，轧制，使得在≤120℃和> 920℃的温度范围内的累积牵伸为> 60％，并且低于Ar 3点的累积牵伸为 30-95％，并在轧后冷却。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JP2007277623A Method for manufacturing thick steel plate having high tensile strength of 780 mpa grade and superior weldability and low-temperature toughness 有权
标题翻译：制造具有780 MPA等级的高拉伸强度和高温焊接和低温韧性的厚钢板的方法
公开(公告)号：JP2007277623A
公开(公告)日：2007-10-25
申请号：JP2006103917
申请日：2006-04-05
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HOSHINO MANABU , FUJIOKA MASAAKI , TANAKA YOICHI , KUMAGAI TATSUYA
IPC分类号： C21D8/02 , C22C38/00 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a thick steel plate having a high tensile strength of 780 MPa grade and superior weldability and low-temperature toughness while adding no Ni to the plate and skipping tempering heat treatment in the manufacturing process.
SOLUTION: A slab includes, by mass%, 0.03-0.055% C, 0.6-1.5% Cr, 0.02-0.05% Nb, 0.005-0.015% Ti, 0.0005-0.0020% B and 0.0015-0.0060% N; has a Pcm value of 0.19 to 0.22%, which is a weld cracking parameter; and has a DI value of 1.70 to 2.50, which is a hardenability index. The method for manufacturing the thick steel plate comprises the steps of: heating the slab to 1,000 to 1,170°C; rough-rolling it at a cumulative reduction rate of 40 to 80% in a temperature range of 930°C or higher; finish-rolling it at 760°C or higher at a cumulative reduction rate of 50 to 70% in a range of 760 to 900°C; subsequently starting accelerated cooling from a temperature higher than 700°C at a cooling velocity of 8 to 80°C/sec; and stopping the accelerated cooling in a range between room temperature and 350°C.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供一种制造具有780MPa级的高拉伸强度和优异的焊接性和低温韧性的厚钢板的方法，同时在该板上不添加Ni并跳过制造中的回火热处理处理。解决方案：以质量％计含有0.03-0.055％C，0.6-1.5％Cr，0.02-0.05％Nb，0.005-0.015％Ti，0.0005-0.0020％B和0.0015-0.0060％N; Pcm值为0.19〜0.22％，为焊缝开裂参数; 并且DI值为1.70〜2.50，这是淬透性指数。制造厚钢板的方法包括以下步骤：将板坯加热至1,000至1170℃; 在930℃以上的温度范围内以40〜80％的累积压缩率进行粗轧，在760〜900℃的范围内，以760℃以上的累积压缩率以50〜70％的速度进行精轧，随后以8至80℃/秒的冷却速度从高于700℃的温度开始加速冷却; 并在室温至350℃的范围内停止加速冷却。版权所有（C）2008，JPO＆INPIT

4. 发明专利

JP2005336602A STEEL MATERIAL USED FOR HIGH HEAT INPUT WELDING BY HEAT INPUT OF 20 TO 100 kJ/mm AND HAVING HIGH TOUGHNESS AT HAZ 有权
标题翻译：用于高热输入的钢材料，通过20至100 kJ / mm的热输入，并在HAZ具有高韧性
公开(公告)号：JP2005336602A
公开(公告)日：2005-12-08
申请号：JP2004335477
申请日：2004-11-19
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ITO MINORU , KOJIMA AKIHIKO , TANAKA YOICHI , MINAGAWA MASANORI , KOSEKI TOSHIHIKO
IPC分类号： C21C7/06 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel material which is used for high heat input welding by a heat input of 20 to 100 kJ/mm, and has high toughness at the HAZ.
SOLUTION: This steel material comprises, by mass%, 0.03-0.17% C, 0.01-0.50% Si, 0.40-1.90% Mn, 0.020% or less P, 0.0010-0.020% S, 0.001-0.070% Al, 0.005-0.030% Ti, 0.0010-0.0100% N, 0.0002-0.0050% B and the balance Fe with unavoidable impurities, so that the expressions of carbon equivalent Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 and the amount of solid solution B: EB=B-0.69×N+0.12×Ti can respectively satisfy 0.30≤Ceq≤0.35 and 0.0002≤EB≤0.0010; and has a structure in which intergranular ferrite shares 1 to 20%.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种用于通过20至100kJ / mm的热输入进行高热输入焊接的钢材，并且在HAZ具有高韧性。 <钢>该钢材以质量％计含有0.03-0.17％C，0.01-0.50％Si，0.40-1.90％Mn，0.020％以下P，0.0010-0.020％S，0.001-0.070％Al， 0.005-0.030％Ti，0.0010-0.0100％N，0.0002-0.0050％B，余量为不可避免的杂质，因此碳当量Ceq = C + Mn / 6 +（Cr + Mo + V）/ 5 + （Ni + Cu）/ 15，固溶体B：EB = B-0.69×N + 0.12×Ti分别满足0.30≤Ceq≤0.35,0.0002≤EB≤0.0010; 并具有晶间铁素体占1〜20％的结构。版权所有（C）2006，JPO＆NCIPI

5. 发明专利

JP2005320624A Thick high-strength steel plate having excellent low-temperature toughness in weld heat-affected zone effected by large heat input welding 有权
标题翻译：厚度超高强度钢板在焊接热影响区受到大量热输入焊接影响，具有优异的低温韧性
公开(公告)号：JP2005320624A
公开(公告)日：2005-11-17
申请号：JP2005102041
申请日：2005-03-31
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ITO MINORU , KOJIMA AKIHIKO , TANAKA YOICHI , MINAGAWA MASANORI , HASEGAWA TOSHINAGA , OTANI JUN
IPC分类号： B21B1/38 , B21B3/00 , C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
CPC分类号： C22C38/08
摘要： PROBLEM TO BE SOLVED: To provide a thick high-strength steel plate by which excellent weld HAZ toughness can be achieved even when a welding is applied with an amount of welding heat input of 20 to 100 kJ/mm to a steel plate having a plate thickness of 50 to 80 mm and a base-material tensile strength of 490 to 570 MPa class.
SOLUTION: The steel plate has a composition which consists of, by mass, 0.03 to 0.14% C, ≤0.30% Si, 0.8 to 2.0% Mn, ≤0.02% P, ≤0.005% S, 0.8 to 4.0% Ni, 0.003 to 0.040% Nb, 0.001 to 0.040% Al, 0.0010 to 0.0100% N, 0.005 to 0.030% Ti and the balance iron with inevitable impurities and in which Ni and Mn satisfy inequality Ni/Mn≥10×Ceq-3 (where 0.36
摘要翻译：要解决的问题：为了提供一种厚的高强度钢板，即使在将焊接热量输入为20至100kJ / mm的焊接施加到钢板上时也可以实现优异的焊接HAZ韧性板厚为50〜80mm，基材拉伸强度为490〜570MPa级。钢板的组成为：以质量计0.03〜0.14％的Si，≤0.30％的Si，0.8〜2.0％的Mn，≤0.02％的P，≤0.005％的S，0.8〜4.0％的Ni ，0.003〜0.040％的Nb，0.001〜0.040％的Al，0.0010〜0.0100％的N，0.005〜0.030％的Ti，余量为不可避免的杂质的铁，其中Ni和Mn满足不等式Ni /Mn≥10×Ceq-3（其中 Ceq = C + Mn / 6 +（Cr + Mo + V）/ 5 +（Ni + Cu）/ 15表示Ceq为0.36

6. 发明专利

JP2011080156A Thick high strength steel plate having excellent low temperature toughness in welding heat affected zone caused by high heat input welding 有权
标题翻译：高强度输入焊接引起的焊接热影响区域中具有优异的低温韧性的高强度钢板
公开(公告)号：JP2011080156A
公开(公告)日：2011-04-21
申请号：JP2010263849
申请日：2010-11-26
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ITO MINORU , KOJIMA AKIHIKO , TANAKA YOICHI , MINAGAWA MASANORI , HASEGAWA TOSHINAGA , OTANI JUN
IPC分类号： C22C38/00 , C21D8/02 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a thick high strength steel plate which can achieve excellent welding HAZ toughness, even when a welding is carried out with a welding heat input of 20 to 100 kJ/mm on a steel plate having a thickness of 50 to 80 mm and having a base material tensile strength of about 490 to 570 MPa. SOLUTION: The steel plate has a chemical composition, in mass%, of C: 0.03 to 0.14%, Si: 0.30% or less, Mn: 0.8 to 2.0%, P: 0.02% or less, S: 0.005% or less, Ni: 1.5 to 4.0%, Nb: 0.003 to 0.040%, Al: 0.001 to 0.040%, N: 0.0010 to 0.0100%, Ti: 0.005 to 0.030%, in which the following Ceq satisfies 0.36 to 0.42 and the contents of Ni and Mn satisfy following formula [1], and the balance: iron and inevitable impurities. [1] Ni/Mn≥10×Ceq-3, wherein Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：为了提供能够实现优异的焊接HAZ韧性的厚的高强度钢板，即使在具有厚度为20〜100kJ / mm的钢板上进行焊接热输入为20〜100kJ / mm的焊接 50〜80mm，基材拉伸强度为490〜570MPa左右。钢板的组成为：质量％：C：0.03〜0.14％，Si：0.30％以下，Mn：0.8〜2.0％，P：0.02％以下，S：0.005％以下Ceq为0.36〜0.42，Ni：1.5〜4.0％，Nb：0.003〜0.040％，Al：0.001〜0.040％，N：0.0010〜0.0100％，Ti：0.005〜0.030％的Ni和Mn满足下式[1]，余量为铁和不可避免的杂质。 [1] Ni /Mn≥10×Ceq-3，Ceq = C + Mn / 6 +（Cr + Mo + V）/ 5 +（Ni + Cu）/ 15。版权所有（C）2011，JPO＆INPIT

7. 发明专利

JP2009263772A METHOD FOR MANUFACTURING THICK HIGH-TENSILE STRENGTH STEEL PLATE HAVING EXCELLENT WELDABILITY AND LOW-TEMPERATURE JOINT TOUGHNESS AND TENSILE STRENGTH OF AT LEAST 780 MPa 有权
标题翻译：制造具有优异的焊接性和低温接头韧性和最小拉伸强度的厚度高的拉伸强度钢板的方法780MPa
公开(公告)号：JP2009263772A
公开(公告)日：2009-11-12
申请号：JP2009061630
申请日：2009-03-13
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HOSHINO MANABU , FUJIOKA MASAAKI , TANAKA YOICHI , MINAGAWA MASANORI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
CPC分类号： C22C38/06 , B21B1/38 , B21B45/0203 , C21D6/005 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D9/50 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing thick high-tensile strength steel plate having excellent weldability and low-temperature joint toughness and tensile strength of ≥780 MPa by omitting tempering heat treatment without addition of Ni.
SOLUTION: The steel billet which contains, by mass%, 0.03 to 0.055% C, 3.0 to 3.5% Mn, 0.002 to 0.10% Al, is limited to ≤0.03% Mo, ≤0.09% Si, ≤0.01% V, ≤0.003% Ti, ≤0.0003% B, and is 0.20 to 0.24% in weld crack sensitivity index Pcm value and 1.00 to 2.60 in hardenability index DI value, is heated to 950 to 110°C. After the steel plate is then rolled to make the cumulative draft 70 to 90% in a temperature range of ≥850°C, and thereafter, the rolling to regulate the cumulative draft to 10 to 40% in a temperature range of ≥780°C to ≥830°C is performed at ≥780°C, and in succession, the accelerated cooling is started at a cooling rate 8 to 80°C/sec from ≥700°C, and the accelerated cooling is stopped at room temperature to 350°C.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种通过省略不加入Ni的回火热处理来制造具有优异的焊接性和低温接合韧性以及≥780MPa的拉伸强度的厚的高强度钢板的方法。＆lt;解决方案＆gt;以质量％计含有0.03〜0.055％的C，3.0〜3.5％的Mn，0.002〜0.10％的Al的钢坯被限制为≤0.03％的Mo，≤0.09％的Si，≤0.01％的V ，≤0.003％Ti，≤0.0003％B，焊接裂纹敏感性指数Pcm值为0.20〜0.24％，淬透性指数DI值为1.00〜2.60，加热至950〜110℃。然后在≥850℃的温度范围内对钢板进行轧制以使累积牵伸力达到70〜90％，然后在≥780℃的温度范围内进行轧制，将累积牵伸调节至10〜40％在≥780℃下进行≥830℃，连续地，以≥700℃从8〜80℃/秒的冷却速度开始加速冷却，在室温〜350℃下停止加速冷却 C。版权所有（C）2010，JPO＆INPIT

8. 发明专利

JP2008261030A Method of manufacturing thick high-strength steel plate excellent in brittle crack propagation stopping characteristic 审中-公开
标题翻译：制造高强度钢板的方法在脆性裂缝传播停止特性方面优秀
公开(公告)号：JP2008261030A
公开(公告)日：2008-10-30
申请号：JP2007105733
申请日：2007-04-13
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： SHIRAHATA HIROYUKI , KOJIMA AKIHIKO , TANAKA YOICHI , NAKAJIMA KIYOTAKA
IPC分类号： C21D8/02 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method of manufacturing a thick high-strength steel plate excellent in brittle crack propagation stopping characteristics which has sufficient arrest property as steel for a large structure, and can industrially stably and efficiently be manufactured.
SOLUTION: A steel having a composition containing, by mass, 0.01-0.14% C, 0.03-0.5% Si, 0.3-2.0% Mn, ≤0.020% P, ≤0.010% S, 0.005-0.050% Nb, 0.005-0.050%Ti, 0.002-0.10% Al, and 0.0010-0.0080% N, and the balance iron with inevitable impurities is heated to 950-1,150°C, and subjected to the rough rolling with the cumulative draft of ≥30% at the temperature of ≥900°C; subjected to the primary finish rolling with the cumulative draft of ≥25% at the temperature of Ar3+20°C to 850°C; and further, subjected to the secondary finish rolling of two or more passes with each pass draft of ≥12% at the temperature of Ar3 to Ar3+50°C; and subjected to the accelerated cooling from the temperature of Ar3 or over to the temperature of ≤500°C with the cooling rate of ≥8°C/s for average thickness.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：解决的问题：提供一种具有优异的脆性裂纹扩展停止特性的厚的高强度钢板的制造方法，其具有作为大型结构的钢具有足够的阻滞性，并且可以在工业上稳定有效地制造。解决方案：具有以质量计含有0.01-0.14％C，0.03-0.5％Si，0.3-2.0％Mn，≤0.020％P，≤0.010％S，0.005-0.050％Nb，0.005 -0.050％Ti，0.002-0.10％Al和0.0010-0.0080％N，余量为不可避免的杂质的铁被加热到950-1,150℃，并进行粗轧，累积吃水量≥30％温度≥900℃; 在Ar3 + 20℃〜850℃的温度下进行一次精轧，累积牵伸≥25％进一步在Ar3〜Ar3 + 50℃的温度下进行两次以上的通过次数的二次精轧，各次通过速度≥12％从Ar3以上的温度加速冷却至≤500℃的温度，平均厚度为8℃/ s以下。版权所有（C）2009，JPO＆INPIT

9. 发明专利

JP2008214754A Method for producing thick high strength steel plate excellent in brittle fracture spreading stopping characteristic and toughness at high heat input welding thermal-affected part and the same steel plate 有权
$Method for producing thick high strength steel plate excellent in brittle fracture spreading stopping characteristic and toughness at high heat input welding thermal-affected part and the same steel plate$
标题翻译：在高热输入焊接热影响部分和相同钢板上生产较高强度钢板的方法，具有较好的断裂伸长特性和韧性
公开(公告)号：JP2008214754A
公开(公告)日：2008-09-18
申请号：JP2008029711
申请日：2008-02-08
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KOJIMA AKIHIKO , TANAKA YOICHI , SHIRAHATA HIROYUKI , NAKAJIMA KIYOTAKA , MIZOMOTO YOSHIFUMI
IPC分类号： C21D8/02 , B21B3/00 , C21C7/04 , C21C7/06 , C22C38/00 , C22C38/14 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a thick high strength steel plate having good brittle fracture spreading resistant characteristic and toughness at high heat input welding thermal affected part, and the thick high strength steel plate obtained with this method.
SOLUTION: The production method is as the followings, that is, a continuously cast slab having the regulated component composition and a remained oxygen content O
Ti deoxidized with Ti as a weak deoxidizing element, remained after deoxidizing with strong deoxidizing element, an effective B content:Bef applied to a solid-solution in austenitic base before transformation and a regulated carbon equivalent Ceq with respective relational formula, is cooled to ≤Ar
3 -200°C after continuously casting and thereafter, reheated to 950-1100°C and successively, a rougher-rolling is performed at ≥900°C to ≥30% cumulative rolling-reduction ratio and a finish-rolling is performed at ≥700°C to ≥50% cumulative rolling-reduction ratio under condition of showing formula: {-0.5×slab heating temperature(°C)+1325}(°C) to both of the finish-rolling starting temperature and the finish-rolling finishing temperature, and successively, the cooling is performed to ≤500°C by applying an accelerated cooling.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种在高热输入焊接热影响部分具有良好的脆性断裂扩展阻力特性和韧性的厚的高强度钢板的制造方法和用该方法获得的厚的高强度钢板。解决方案：制备方法如下，即用Ti作为弱脱氧元素脱氧的具有调节组分组成和剩余氧含量O Ti 的连续铸造板坯保持在用强脱氧元素脱氧，有效的B含量：施加到转化前的奥氏体碱中的固溶体和具有各自关系式的碳当量Ceq的Bef被冷却至≤Ar 3 -200° C后，再加热至950-1100℃，随后在≥900℃〜≥30％的累积压下率下进行粗轧，在≥700℃〜条件下≥50％的累积轧制压下率与碾轧初始温度和精轧终轧温度的关系如下：ä-0.5×板坯加热温度（℃）+1325}（℃）依次通过a进行冷却至≤500℃ 施加加速冷却。版权所有（C）2008，JPO＆INPIT

10. 发明专利

JP2007327100A Thick steel plate having excellent toughness in high-heat input weld heat affected zone 有权
标题翻译：在高输入焊接热影响区域内具有优异韧性的厚钢板
公开(公告)号：JP2007327100A
公开(公告)日：2007-12-20
申请号：JP2006159095
申请日：2006-06-07
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KOJIMA AKIHIKO , TANAKA YOICHI , YOSHIDA YUZURU , NAKAJIMA KIYOTAKA
IPC分类号： C22C38/00 , C22C38/12 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a thick steel plate having a thickness of 15 to 100 mm and a yield strength in a class of 325 to 500 MPa, and in which the average value of Charpy impact absorbed energy at -20 to 0°C is ≥150 J in a HAZ (Heat Affected Zone) welded by a welding heat input value of 20 to 150 kJ/mm.
SOLUTION: The thick steel plate having excellent toughness in the high heat input weld heat affected zone welded by a welding heat input value of 20 to 150 kJ/mm has a composition comprising, by mass, 0.03 to 0.2% C, ≤0.5% Si, 0.5 to 2.0% Mn, ≤0.02% P, 0.001 to 0.005% S, 0.001 to 0.1% Al, 0.01 to 0.1% V, 0.0001 to
摘要翻译：待解决的问题：提供厚度为15〜100mm，屈服强度为325〜500MPa的厚钢板，其中夏比冲击吸收能量的平均值为-20〜在焊接热输入值为20〜150kJ / mm的HAZ（受热影响区）中，0℃≥150J。解决方案：通过焊接热输入值为20至150kJ / mm焊接的高热输入焊接热影响区域中具有优异韧性的厚钢板具有以质量计0.03至0.2％C，≤ 0.5％Si，0.5-2.0％Mn，≤0.02％P，0.001至0.005％S，0.001至0.1％Al，0.01至0.1％V，0.0001至<0.0003％B，0.001至0.006％N和≤0.004％O ，余铁与不可避免的杂质。版权所有（C）2008，JPO＆INPIT

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