公开(公告)号：US20180245172A1

公开(公告)日：2018-08-30

申请号：US15558963

申请日：2016-03-16

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION ,  DENSO CORPORATION

Inventor： Masato YUYA ,  Motoki TAKASUGA ,  Taizo MAKINO ,  Masashi HIGASHIDA ,  Tatsuya HASEGAWA ,  Kouji MORITA ,  Toshimasa ITO ,  Tomomitsu FUKUOKA ,  Tadashi NISHIWAKI ,  Yoshihiro TANIMURA

IPC: C21D8/00 ,  C21D6/00 ,  C21D1/18 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D8/005 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D6/02 ,  C21D8/065 ,  C21D9/0068 ,  C21D9/525 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: Age hardenable steel is low in hardness after hot forging, providing a machine part with the desired fatigue strength and yield strength by aging treatment, and high in toughness after aging treatment, comprising C: 0.09 to 0.20%, Si: 0.01 to 0.40%, Mn: 1.5 to 2.5%, S: 0.001 to 0.045%, Cr: over 1.00% to 2.00%, Al: 0.001 to 0.060%, V: 0.22 to 0.55%, N: over 0.0080 to 0.0170%, and a balance of Fe and impurities, where an area rate of bainite structures is 80% or more, an effective V ratio (amount of dissolved V/total amount of V) is 0.9 or more, a P and Ti in the impurities is P: 0.03% or less and Ti: less than 0.005%, and the chemical composition is one where the following F1 is 1.00 or less and the F2 is 0.30 or more: F1=C+0.1×Si+0.2×Mn+0.15×Cr+0.35×V F2=−4.5×C+Mn+Cr−3.5×V

公开(公告)号：US20170073785A1

公开(公告)日：2017-03-16

申请号：US15123076

申请日：2015-03-03

Applicant: DAIDO STEEL CO., LTD. ,  DENSO CORPORATION

Inventor： Yuuki TANAKA ,  Makoto HARITANI ,  Takahiro MIYAZAKI ,  Kouji MORITA ,  Yoshihiro TANIMURA ,  Toshimasa ITO ,  Tadashi NISHIWAKI ,  Tomomitsu FUKUOKA

IPC: C21D6/00 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/60 ,  C22C38/46

Abstract: The present invention provides an age hardening type bainitic microalloyed steel having a composition which includes, in terms of mass %: 0.06-0.35% of C; 0.01-2.00% of Si; 0.10-3.00% of Mn; 0.001-0.200% of S; 0.001-2.00% of Cu; 0.40-3.00% of Ni; 0.10-3.00% of Cr; 0.10-1.00% of Mo; 0.10-1.00% of V; and 0.001-0.100% of s-Al, with the remainder being Fe and unavoidable impurities, and which satisfies a value of the following expression (1) to be 20 or larger and a value of the following expression (2) to be 0.82 or larger: 3×[C]+10×[Mn]+2×[Cu]+2×[Ni]+12×[Cr]+9×[Mo]+2×[V]  expression (1); 1.66×[C]+0.18×[Si]+0.27×[Mn]+0.09×[Ni]+0.32×[Cr]+0.34×[Mo]+0.44×[V]  expression (2), in which each [ ] in the expression (1) and the expression dicates a content of the element shown therein in terms of mass %.

Abstract translation: 其中表达式（1）中的每个[]和表达式以质量％表示其中所示的元素的含量。

公开(公告)号：US20210047715A1

公开(公告)日：2021-02-18

申请号：US17083391

申请日：2020-10-29

Applicant: DENSO CORPORATION

Inventor： Mirai SAKAMOTO ,  Yoshihiro TANIMURA ,  Shigeyuki KUSANO ,  Noritsugu KATO ,  Yuki KATO

IPC: C22C38/44 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/46

Abstract: A martensitic stainless steel contains 0.20 mass %≤C≤0.60 mass %, 0.10 mass %≤N≤0.50 mass %, 14.00 mass %≤Cr≤17.00 mass %, 1.00 mass %≤Mo≤3.00 mass %, 0.20 mass %≤V≤0.40 mass %, Si≤0.30 mass %, Mn≤0.80 mass %, P≤0.040 mass %, S≤0.040 mass %, Cu≤0.25 mass %, Ni≤0.20 mass %, and the balance Fe with inevitable impurities.

公开(公告)号：US20180057917A1

公开(公告)日：2018-03-01

申请号：US15646222

申请日：2017-07-11

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION ,  DENSO CORPORATION

Inventor： Naoki MATSUI ,  Masashi HIGASHIDA ,  Hitoshi MATSUMOTO ,  Yutaka NEISHI ,  Taizo MAKINO ,  Kouji MORITA ,  Yoshihiro TANIMURA ,  Naoyuki SASHIMA ,  Toshimasa ITOU

IPC: C22C38/50 ,  F02M63/02 ,  B21K3/00 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46 ,  C21D8/06 ,  C21D8/10 ,  C21D9/14

CPC classification number: C22C38/50 ,  B21K3/00 ,  C21D8/06 ,  C21D8/10 ,  C21D9/14 ,  C21D2211/004 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/46 ,  F02M63/0275

Abstract: A rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, and N: 0.005-0.030%, and the balance of Fe and impurities, i.e., P: 0.035% or less and O: 0.0030% or less, wherein Fn1=C+Si/10+Mn/5+5Cr/22+1.65V−5S/7 is 0.90 to 1.20. The predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R1/2 part of a longitudinal cross section of the steel bar as W (mm) is 99.99% is 100 mm or narrower. The number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 mm observed per unit area of the R1/2 part of a transverse cross section of the steel bar is 500 pieces/mm2 or higher.