公开(公告)号：US08070887B2

公开(公告)日：2011-12-06

申请号：US10410014

申请日：2003-04-09

申请人： Hitoshi Asahi ,  Yasuhiro Shinohara ,  Takuya Hara

发明人： Hitoshi Asahi ,  Yasuhiro Shinohara ,  Takuya Hara

IPC分类号： C21D9/08 ,  C22C38/00 ,  C22C38/18

CPC分类号： C22C38/04 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/12 ,  C22C38/14

摘要： The present invention provides a line pipe of, e.g., the API standard X60 to X100 class. The line pipe has an excellent deformability, as well as excellent low temperature toughness and high productivity, a steel plate used as the material of the steel pipe. Methods for producing the steel pipe and the steel plate are also provided. In particular, a high-strength steel plate excellent in the deformability has a ferrite phase is dispersed finely, and accounts for 5% to 40% in area percentage in a low temperature transformation structure mainly composed of a bainite phase. For example, most grain sizes of the ferrite phase are smaller than the average grain size of the bainite phase. A high-strength steel pipe excellent in deformability is also provided, in which a large diameter steel pipe is produced through forming the steel plate into a pipe shape. The steel pipe has the above-referenced structure, and satisfies the conditions that YS/TS is 0.95 or less and YS×uEL is 5,000 or more. Methods for producing such steel plate and steel pipe are also provided.

摘要翻译： 本发明提供了例如API标准X60至X100类的管线管。 线管具有优异的变形性，以及优异的低温韧性和高生产率，用作钢管材料的钢板。 还提供了生产钢管和钢板的方法。 特别是，在主要由贝氏体相组成的低温转变结构中，变形性优异的高强度钢板的铁素体相分散细小，占面积率的5〜40％。 例如，铁素体相的大部分晶粒尺寸小于贝氏体相的平均晶粒尺寸。 还提供了一种变形能力优异的高强度钢管，其中通过将钢板形成管状而制造大直径钢管。 钢管具有上述结构，满足YS / TS为0.95以下，YS×uEL为5000以上的条件。 还提供了生产这种钢板和钢管的方法。

公开(公告)号：US08715430B2

公开(公告)日：2014-05-06

申请号：US11887885

申请日：2005-04-19

申请人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

发明人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

IPC分类号： C22C38/00

CPC分类号： C22C38/02 ,  C21D8/0205 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

摘要： The present invention provides high strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of the same, that is, high strength steel plate excellent in ductile fracture characteristic, and high strength welded pipe using that steel plate as a base material, having a tensile strength corresponding to the X100 class of the API standard, containing, by mass %, C: 0.01 to 0.5%, Si: 0.01 to 3%, Mn: 0.1 to 5%, P: 0.03% or less, and S: 0.03% or less and a balance of Fe and unavoidable impurities, having a microstructure comprised of, by area ratio, 1 to 60% of ferrite and the balance of bainite and martensite, having a maximum value of the {100} accumulation degree of the cross-section rotated 20 to 50° from the plate thickness cross-section about the rolling direction as an axis of 3 or less, and having plate thickness parallel cracks measured by ultrasonic flaw detection of less than 1 mm.

摘要翻译： 本发明提供了具有优异的延性断裂特性的高强度钢板和高强度焊接管及其制造方法，即延性断裂特性优异的高强度钢板，以及使用该钢板作为 基材，具有对应于API标准的X100等级的拉伸强度，以质量％计含有C：0.01〜0.5％，Si：0.01〜3％，Mn：0.1〜5％，P：0.03％以下 ，S：0.03％以下，余量为Fe和不可避免的杂质，其微结构由面积比为1〜60％的铁素体和余量的贝氏体和马氏体构成，其最大值为{100} 横截面从作为轴线的轧制方向的板厚横截面旋转20至50°的横截面的累积度为3以下，并且通过超声波探伤小于1mm测量的板厚平行裂纹。

公开(公告)号：US20120118425A1

公开(公告)日：2012-05-17

申请号：US13261070

申请日：2010-06-10

申请人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

发明人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

IPC分类号： F16L9/14 ,  C21D9/08

CPC分类号： C22C38/04 ,  C21D8/02 ,  C21D9/08 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： This high-strength steel pipe includes, by mass%, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650° C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.

摘要翻译： 该高强度钢管以质量％计含有C：0.02％〜0.09％，Mn：0.4〜2.5％，Cr：0.1〜1.0％，Ti：0.005〜0.03％，Nb：0.005〜0.3 ％，余量由Fe和不可避免的杂质组成，其中Si，Al，P，S和N分别为0.6％以下，0.1％以下，0.02％以下，0.005％以下，0.008％以下 贝氏体相变指数BT分别为650℃以下，其微结构为包括第一贝氏体和第二贝氏体的单贝氏体组织，第一贝氏体为不含碳化物的贝氏体铁素体的集聚组织，第二贝氏体组织 贝氏体是贝氏体铁素体之间不含碳化物和渗碳体的贝氏体铁素体的混合微观结构。

公开(公告)号：US08685182B2

公开(公告)日：2014-04-01

申请号：US13261070

申请日：2010-06-10

申请人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

发明人： Kensuke Nagai ,  Yasuhiro Shinohara ,  Shinya Sakamoto ,  Takuya Hara ,  Hitoshi Asahi

IPC分类号： C22C38/48 ,  C22C38/50 ,  C21D8/10

CPC分类号： C22C38/04 ,  C21D8/02 ,  C21D9/08 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： This high-strength steel pipe includes, by mass %, C: 0.02% to 0.09%, Mn: 0.4% to 2.5%, Cr: 0.1% to 1.0%, Ti: 0.005% to 0.03%, Nb: 0.005% to 0.3%, and a balance consisting of Fe and inevitable impurities, in which Si, Al, P, S, and N are limited to 0.6% or less, 0.1% or less, 0.02% or less, 0.005% or less, 0.008% or less, respectively, the bainite transformation index BT is 650° C. or less, and the microstructure thereof is a single bainite microstructure including first bainite and second bainite, the first bainite being a gathered microstructure of bainitic ferrite including no carbide, and the second bainite being a mixed microstructure of bainitic ferrite including no carbide and cementite between the bainitic ferrites.

摘要翻译： 该高强度钢管以质量％计含有C：0.02％〜0.09％，Mn：0.4〜2.5％，Cr：0.1〜1.0％，Ti：0.005〜0.03％，Nb：0.005〜0.3 ％，余量由Fe和不可避免的杂质组成，其中Si，Al，P，S和N分别为0.6％以下，0.1％以下，0.02％以下，0.005％以下，0.008％以下 贝氏体相变指数BT分别为650℃以下，其微观结构为包括第一贝氏体和第二贝氏体的单贝氏体组织，第一贝氏体为不含碳化物的贝氏体铁素体的集聚组织，第二贝氏体组织 贝氏体是贝氏体铁素体之间不含碳化物和渗碳体的贝氏体铁素体的混合微观结构。

公开(公告)号：US20090025835A1

公开(公告)日：2009-01-29

申请号：US11887885

申请日：2005-04-19

申请人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

发明人： Takuya Hara ,  Yasuhiro Shinohara ,  Hitoshi Asahi ,  Yoshio Terada

IPC分类号： C21D9/08 ,  C22C38/04 ,  C22C38/08 ,  C22C38/20 ,  C22C38/32 ,  C22C38/44

CPC分类号： C22C38/02 ,  C21D8/0205 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

摘要： The present invention provides high strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of the same, that is, high strength steel plate excellent in ductile fracture characteristic, and high strength welded pipe using that steel plate as a base material, having a tensile strength corresponding to the X100 class of the API standard, containing, by mass %, C: 0.01 to 0.5%, Si: 0.01 to 3%, Mn: 0.1 to 5%, P: 0.03% or less, and S: 0.03% or less and a balance of Fe and unavoidable impurities, having a microstructure comprised of, by area ratio, 1 to 60% of ferrite and the balance of bainite and martensite, having a maximum value of the {100} accumulation degree of the cross-section rotated 20 to 50° from the plate thickness cross-section about the rolling direction as an axis of 3 or less, and having plate thickness parallel cracks measured by ultrasonic flaw detection of less than 1 mm.

摘要翻译： 本发明提供了具有优异的延性断裂特性的高强度钢板和高强度焊接管及其制造方法，即延性断裂特性优异的高强度钢板，以及使用该钢板作为 基材，具有对应于API标准的X100等级的拉伸强度，以质量％计含有C：0.01〜0.5％，Si：0.01〜3％，Mn：0.1〜5％，P：0.03％以下 ，S：0.03％以下，余量为Fe和不可避免的杂质，其微结构由面积比为1〜60％的铁素体和余量的贝氏体和马氏体构成，其最大值为{100} 横截面从作为轴线的轧制方向的板厚横截面旋转20至50°的横截面的累积度为3以下，并且通过超声波探伤小于1mm测量的板厚平行裂纹。

公开(公告)号：US20130037162A1

公开(公告)日：2013-02-14

申请号：US13509495

申请日：2011-09-13

申请人： Yasuhiro Shinohara ,  Takuya Hara ,  Naoki Doi ,  Eiichi Yamashita

发明人： Yasuhiro Shinohara ,  Takuya Hara ,  Naoki Doi ,  Eiichi Yamashita

IPC分类号： F16L9/02 ,  B23K9/025

CPC分类号： C21D9/08 ,  B23K9/0253 ,  B23K9/186 ,  B23K35/3053 ,  B23K35/3073 ,  B23K2101/06 ,  B23K2103/04 ,  C21D8/02 ,  C21D8/105 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  Y10S148/909

摘要： The present invention provides a thick welded steel pipe excellent in low temperature toughness in which contents of Mn and Mo satisfy (Expression 1) below, Pcm obtained by (Expression 2) below is 0.16 to 0.19, and a metal structure of a base material steel plate consists of ferrite being 30 to 95% in an area ratio and a low temperature transformation structure, and in a metal structure of a coarse-grained HAZ, an area ratio of grain boundary ferrite is 1.5% or more, the total area ratio of the grain boundary ferrite and intragranular ferrite is not less than 11% nor more than 90%, an area ratio of MA is 10% or less, and its balance is composed of bainite. 1.2325≦(0.85×[Mn]−[Mo])≦1.5215   (Expression 1) and Pcm=[C]+[Si]/30+([Mn]+[Cu]+[Cr])/20+[Ni]/60+[Mo]/15+[V]/10   (Expression 2)

摘要翻译： 本发明提供了下述（式（2））得到的Mn和Mo含量满足（表达式1），Pcm为0.16〜0.19的低温韧性优良的厚焊接钢管，基材钢 平板由面积比为30〜95％的铁素体和低温相变结构组成，在粗粒HAZ的金属结构中，晶界铁素体的面积比为1.5％以上，总面积比为 晶界铁素体和晶内铁素体不小于11％，不大于90％，MA的面积比为10％以下，平衡度由贝氏体组成。 1.2325＆nlE;（0.85×[Mn] - [Mo]）＆nlE; 1.5215（表达式1）和Pcm = [C] + [Si] / 30 +（[Mn] + [Cu] + [Cr] [Ni] / 60 + [Mo] / 15 + [V] / 10（表达式2）

公开(公告)号：US08974610B2

公开(公告)日：2015-03-10

申请号：US13575051

申请日：2011-02-04

申请人： Taishi Fujishiro ,  Takuya Hara ,  Yoshio Terada ,  Shinya Sakamoto ,  Hitoshi Asahi

发明人： Taishi Fujishiro ,  Takuya Hara ,  Yoshio Terada ,  Shinya Sakamoto ,  Hitoshi Asahi

IPC分类号： C21D9/08 ,  C21D8/10 ,  C22C38/12 ,  C22C38/02 ,  C22C38/04 ,  F16L31/02 ,  B23K35/30 ,  B23K31/02 ,  C21D9/50 ,  C22C38/00 ,  C22C38/14

CPC分类号： B23K35/3053 ,  B23K31/027 ,  B23K2101/06 ,  B23K2103/04 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

摘要： A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass %, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N]−[Ti]/3.4 is less than 0.003, the average grain size of the prior γ grains in heat affected zones in the steel plate is 250 μm or less, and the prior γ grains include bainite and intragranular bainite.

摘要翻译： 通过焊接形成管状的钢板的焊缝部分来获得高强度焊接钢管。 在高强度焊接钢管中，钢板的贱金属以质量％计含有C：0.010〜0.080％，Si：0.01〜0.50％，Mn：0.50〜2.00％，S：0.0001％ 至0.0050％，Ti：0.003％至0.030％，Mo：0.05％至1.00％，B：0.0003％至0.0100％，O：0.0001％至0.0080％，N：0.006％至0.0118％，P：限于0.050％ 以下，Al：0.008％以下，Fe和不可避免的杂质余量Ceq为0.30〜0.53，Pcm为0.10〜0.20，[N] - [Ti] /3.4小于0.003，平均粒径 钢板的热影响区域的现有γ晶粒的尺寸为250μm以下，原来的γ晶粒包括贝氏体和晶粒内贝氏体。

公开(公告)号：US20120291907A1

公开(公告)日：2012-11-22

申请号：US13575051

申请日：2011-02-04

申请人： Taishi Fujishiro ,  Takuya Hara ,  Yoshio Terada ,  Shinya Sakamoto ,  Hitoshi Asahi

发明人： Taishi Fujishiro ,  Takuya Hara ,  Yoshio Terada ,  Shinya Sakamoto ,  Hitoshi Asahi

IPC分类号： F16L9/00 ,  B23K31/02

CPC分类号： B23K35/3053 ,  B23K31/027 ,  B23K2101/06 ,  B23K2103/04 ,  C21D8/105 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  Y10S148/909

摘要： A high-strength welded steel pipe is obtained by welding a seam weld portion of a steel plate that are formed in a pipe shape. In the high-strength welded steel pipe, a base metal of the steel plate includes, by mass %, C: 0.010% to 0.080%, Si: 0.01% to 0.50%, Mn: 0.50% to 2.00%, S: 0.0001% to 0.0050%, Ti: 0.003% to 0.030%, Mo: 0.05% to 1.00%, B: 0.0003% to 0.0100%, O: 0.0001% to 0.0080%, N: 0.006% to 0.0118%, P: limited to 0.050% or less, Al: limited to 0.008% or less, and the balance of Fe and inevitable impurities, Ceq is 0.30 to 0.53, Pcm is 0.10 to 0.20, [N]—[Ti]/3.4 is less than 0.003, the average grain size of the prior γ grains in heat affected zones in the steel plate is 250 μm or less, and the prior γ grains include bainite and intragranular bainite.

摘要翻译： 通过焊接形成管状的钢板的焊缝部分来获得高强度焊接钢管。 在高强度焊接钢管中，钢板的贱金属以质量％计含有C：0.010〜0.080％，Si：0.01〜0.50％，Mn：0.50〜2.00％，S：0.0001％ 至0.0050％，Ti：0.003％至0.030％，Mo：0.05％至1.00％，B：0.0003％至0.0100％，O：0.0001％至0.0080％，N：0.006％至0.0118％，P：限于0.050％ 以下，Al：0.008％以下，Fe和不可避免的杂质余量Ceq为0.30〜0.53，Pcm为0.10〜0.20，[N] - [Ti] /3.4小于0.003，平均粒径 钢板的热影响区域的现有γ晶粒的尺寸为250μm以下，原来的γ晶粒包括贝氏体和晶粒内贝氏体。

公开(公告)号：US07736447B2

公开(公告)日：2010-06-15

申请号：US10582830

申请日：2004-12-17

申请人： Hitoshi Asahi ,  Takuya Hara

发明人： Hitoshi Asahi ,  Takuya Hara

IPC分类号： C22C38/12 ,  C22C38/14 ,  C22C38/04 ,  C21D8/02 ,  C21D8/10

CPC分类号： C22C38/12 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/105 ,  C21D9/08 ,  C21D9/46 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： Ultra-high-strength linepipes having excellent low-temperature toughness manufactured by welding together the edges of steel plates comprising C of 0.03 to 0.07 mass %, Si of not more than 0.6 mass %, Mn of 1.5 to 2.5 mass %, P of not more than 0.015 mass %, S of not more than 0.003 mass %, Ni of 0.1 to 1.5 mass %, Mo of 0.15 to 0.60 mass %, Nb of 0.01 to 0.10 mass %, Ti of 0.005 to 0.030 mass %, Al of not more than 0.06 mass %, one or more of required amounts of B, N, V, Cu, Cr, Ca, REM (rare-earth metals) and Mg, with the remainder consisting of iron and unavoidable impurities and having a (Hv-ave)/(Hv-M) ratio between 0.8 and 0.9 at 2.5≦P≦4.0, wherein Hv-ave is the average Vickers hardness in the direction of the thickness of the base metal and Hv-M is the martensite hardness depending on C-content (Hv-M=270+1300C) and a tensile strength TS-C between 900 MPa and 1100 MPa; P=2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+(1+β)Mo−1+β (β=1 when B≧3 ppm and β=0 when B

摘要翻译： 通过将包含0.03〜0.07质量％的C，不大于0.6质量％的Si，1.5〜2.5质量％的Mn，1.5〜2.5质量％的Mn，不为P的钢板的边缘焊接在一起，制造出优异的低温韧性的超高强度线管 大于0.015质量％，S：0.003质量％以下，Ni：0.1〜1.5质量％，Mo：0.15〜0.60质量％，Nb：0.01〜0.10质量％，Ti：0.005〜0.030质量％ 大于0.06质量％，所需量的B，N，V，Cu，Cr，Ca，REM（稀土金属）和Mg中的一种或多种，​​其余由铁和不可避免的杂质组成，并具有（Hv- ave）/（Hv-M）在2.5和nlE下的0.8和0.9之间的比值; P＆nlE; 4.0，其中Hv-ave是贱金属厚度方向上的维氏硬度平均值，Hv-M是马氏体硬度，取决于 C含量（Hv-M = 270±1300℃），拉伸强度TS-C在900MPa〜1100MPa之间; P = 2.7C + 0.4Si + Mn + 0.8Cr + 0.45（Ni + Cu）+（1 +＆bgr）Mo-1 +＆bgr; （B≥3ppm时＆Bgr = 1，B≤3ppm时为＆bgr = 0）。

公开(公告)号：US07601231B2

公开(公告)日：2009-10-13

申请号：US10444743

申请日：2003-05-23

申请人： Takuya Hara ,  Hitoshi Asahi

发明人： Takuya Hara ,  Hitoshi Asahi

IPC分类号： C22C38/04 ,  C22C38/14 ,  C22C38/12

CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D8/10 ,  C21D8/1261 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/58 ,  Y10S148/909

摘要： A high-strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel are provided. For example, the steel pipe includes elements to enhance hardenability for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding. In the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM, and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo. Such elements enhancing hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method may include heating a casting to a temperature not lower than the Ac3 point, hot rolling such casting, and thereafter cooling the resulting hot-rolled steel plate at a prescribed cooling rate.

摘要翻译： 提供了一种现场焊接性优异的高强度钢管和通过提高钢的低温韧性的可靠性来制造钢管的方法。 例如，钢管包括提高淬火性的元素，以进一步提高强化强度，并提高经受双层或多层焊接的焊接热影响区的韧性。 在该方法中，通过含有规定量的C，Si，Mn，P，S，Ni，Mo，Nb，Ti，Al和N，由贝氏体和/或马氏体构成的结构，由钢构成，作为 需要B，V，Cu，Cr，Ca，REM和Mg中的一种或多种，​​调节C，Si，Mn，Cr，Ni，Cu，V和Mo。这些元素通过具体的关系式提高淬透性 。 原奥氏体晶粒的直径可以在规定的范围内调节。 该方法可以包括将铸件加热到不低于Ac3点的温度，热轧这种铸造，然后以规定的冷却速度冷却所得到的热轧钢板。