公开(公告)号：US20240183016A1

公开(公告)日：2024-06-06

申请号：US18553377

申请日：2022-03-08

申请人： NISSAN MOTOR CO., LTD.

发明人： Daisuke KOBAYASHI ,  Takahiro HAMADA ,  Hideki MASUO ,  Yuuichi YAMADA ,  Alexandre GOLOBORODKO ,  Ryosuke OHASHI ,  Shohei ASAOKA ,  Makio KATO ,  Shinji YASUDA

IPC分类号： C22C38/46 ,  C21D7/13 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  F16C3/06

CPC分类号： C22C38/46 ,  C21D7/13 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  F16C3/06 ,  F16C2204/62 ,  F16C2204/64 ,  F16C2204/74

摘要： A non-heat treated steel for a crankshaft of the present invention comprises iron (Fe) as a main component and also comprises 0.37 to 0.43 mass % of carbon (C), 0.15 to 0.35 mass % of silicon (Si), 0.90 to 1.30 mass % of manganese (Mn), 0.08 to 0.15 mass % of vanadium (V); and the content of phosphorous (P) is 0.030 mass % or less, the content of copper (Cu) is 0.300 mass % or less, the content of nickel (Ni) is 0.30 mass % or less, and the content of chromium (Cr) is 0.35 mass % or less.
The non-heat treated steel also comprises 0.010 to 0.035 mass % of sulfur (S) and 0.02 to 0.05 mass % of bismuth (Bi), which are machinability-improving elements. Thus, the non-heat treated steel has a high fatigue strength and a high yield strength and also has an excellent machinability.

公开(公告)号：US20210040978A1

公开(公告)日：2021-02-11

申请号：US16965643

申请日：2018-01-30

申请人： NISSAN MOTOR CO., LTD.

发明人： Takahiro HAMADA ,  Daisuke KOBAYASHI

IPC分类号： F16B35/00 ,  C22C38/22 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C21D9/00

摘要： A bolt of the present invention is a high-strength bolt of high-carbon steel having a tempered martensite structure, wherein the composition of the bolt comprises: 0.50 mass % or more and 0.65 mass % or less of carbon (C); 1.5 mass % or more and 2.5 mass % or less of silicon (Si); 1.0 mass % or more and 2.0 mass % or less of chromium (Cr); 0.2 mass % or more and 1.0 mass % or less of manganese (Mn); and 1.5 mass % or more and 5.0 mass % or less of molybdenum (Mo); a total content of impurities being phosphor (P) and sulfur (S) is 0.03 mass % or more; and the remaining is iron (Fe). Furthermore, the carbon concentration satisfies the following Formula (1): 0.75≤X

公开(公告)号：US20210017618A1

公开(公告)日：2021-01-21

申请号：US16965652

申请日：2018-01-30

申请人： NISSAN MOTOR CO., LTD.

发明人： Takahiro HAMADA ,  Daisuke KOBAYASHI

IPC分类号： C21D9/00 ,  F16B33/00 ,  C22C38/22 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/00 ,  C21D6/00

摘要： A bolt of the present invention has a composition comprising: 0.50 mass % or greater and 0.65 mass % or less of carbon (C), 1.5 mass % or greater and 2.5 mass % or less of silicon (Si), 1.0 mass % or greater and 2.0 mass % or less of chromium (Cr), 0.2 mass % or greater and 1.0 mass % or less of manganese (Mn), 1.5 mass % or greater and 5.0 mass % or less of molybdenum (Mo), wherein a total amount of phosphorous (P) and sulfur (S) as impurities is 0.03 mass % or less, the remaining is iron (Fe), and the bolt comprises an iron based oxide film with a film thickness of 3 μm or greater and 20 μm or less on the surface thereof. The bolt has excellent delayed fracture resistance and reliably provides a fastening axial force.