公开(公告)号：US20240352562A1

公开(公告)日：2024-10-24

申请号：US18258704

申请日：2021-09-29

Applicant: AICHI STEEL CORPORATION

Inventor： Takayoshi SUGIURA ,  Ryota TAKAO ,  Tomoaki YUTANI ,  Takeyuki SHIMADA ,  Shuhei YOKOI

IPC: C22C38/04 ,  C21D1/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32

CPC classification number: C22C38/04 ,  C21D1/06 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C21D2211/005

Abstract: A case hardening steel for warm forging at a forging temperature of 850° C. to 1100° C. The case hardening steel has a chemical composition including: C: 0.15 to 0.23%; Si: 0.60 to 0.95%; Mn: 0.60 to 1.20%; P: 0.035% or less; S: 0.035% or less; Cr: 1.50% or less (excluding 0%); Al: 0.050% or less; Ti: 0.01 to 0.05%; B: 0.0005 to 0.0050%; N: 0.0020 to 0.0200%; Mo: 0.20% or less as an optional element; Nb: 0.01 to 0.05% as an optional element; and Fe, and satisfies Formulae 1 and 2: Formula 1: 90≥−120*C+20.1*Si−5.3*Mn−8.5*Mo+96≥80, Formula 2: 160≥40*Si+39*Mn+10*Cr+30*Mo+84≥145.

公开(公告)号：US12060632B2

公开(公告)日：2024-08-13

申请号：US17770095

申请日：2020-11-17

Applicant: NIPPON STEEL STAINLESS STEEL CORPORATION

Inventor： Kou Nishimura ,  Yoshiharu Inoue

IPC: C22C38/60 ,  C21D1/06 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C23C8/26

CPC classification number: C22C38/60 ,  C21D1/06 ,  C21D6/004 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C23C8/26 ,  C21D2211/005

Abstract: A ferritic stainless steel sheet includes a base metal and a nitrided layer that is formed on a surface of the base metal, a chemical composition of the base metal contains, in mass %, C: 0.001 to 0.020%, Si: 0.01 to 1.50%, Mn: 0.01 to 1.50%, P: 0.010 to 0.050%, S: 0.0001 to 0.010%, Cr: 16.0 to 25.0%, N: 0.001 to 0.030%, Ti: 0.01 to 0.30%, and optional elements, with the balance: Fe and unavoidable impurities, a steel microstructure of the base metal includes, in volume ratio, 95% or more of a ferritic phase, the nitrided layer is a layer that is present in a region from a surface of a rolled surface to a 0.05 μm depth position in a sheet thickness direction, and an average nitrogen concentration in the nitrided layer is, in mass %, 0.80% or more.

公开(公告)号：US11959177B2

公开(公告)日：2024-04-16

申请号：US17107955

申请日：2020-12-01

Applicant: JFE STEEL CORPORATION

Inventor： Masayuki Kasai ,  Takashi Iwamoto ,  Kunikazu Tomita

IPC: C23C8/32 ,  C21D1/06 ,  C21D1/74 ,  C21D6/00 ,  C21D8/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C8/26 ,  C21D1/20 ,  C21D7/13

CPC classification number: C23C8/32 ,  C21D1/06 ,  C21D1/74 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C8/26 ,  C21D1/20 ,  C21D7/13 ,  C21D2211/002 ,  C21D2211/004

Abstract: A component comprising a core part and a surface layer is provided. The core part contains C: 0.01%≤ and

公开(公告)号：US11767569B2

公开(公告)日：2023-09-26

申请号：US16306464

申请日：2017-05-31

Applicant: OVAKO SWEDEN AB

Inventor： Jan-Erik Andersson

IPC: C22C38/40 ,  C21D6/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C21D1/25 ,  C22C38/08 ,  C22C38/12 ,  C21D6/00 ,  C21D1/06 ,  C23C8/02 ,  C23C8/26 ,  C21D1/18

CPC classification number: C21D6/02 ,  C21D1/06 ,  C21D1/25 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/40 ,  C22C38/44 ,  C22C38/46 ,  C23C8/02 ,  C23C8/26 ,  C21D1/18 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/008

Abstract: There is provided a precipitation hardening stainless steel with the composition: C: 0.05-0.30 wt %, Ni: 9-10 wt %, Mo: 0.5-1.5 wt %, Al: 1.75-3 wt %, Cr: 10.5-13 wt %, V: 0.25-1.5 wt %, Co: 0-0.03 wt %, Mn: 0-0.5 wt %, Si: 0-0.3 wt %, and remaining part up to 100 wt % is Fe and impurity elements, with the additional proviso that the amounts of Al and Ni also fulfil Al=Ni/4±0.5 in wt %. Further Creq is in the interval 11-15.4 wt % and Nieq is in the interval 10.5-15 wt %. There is the possibility to have very low amounts of cobalt, well below 0.01 wt %. The precipitation hardening stainless steel displays, low segregation, high yield strength at elevated temperatures, and can also suitably be nitrided. The precipitation hardening stainless steel is more economical to manufacture compared to stainless steel according to the state of the art with the same strength at elevated temperatures.

公开(公告)号：US20230296152A1

公开(公告)日：2023-09-21

申请号：US17754566

申请日：2020-10-15

Applicant: NIPPON STEEL CORPORATION ,  AISIN CORPORATION ,  NHK SPRING CO., LTD. ,  NIPPON STEEL SG WIRE CO., LTD.

Inventor： Shinya TERAMOTO ,  Yutaka NEISHI ,  Michimasa AONO ,  Shuji KOZAWA ,  Yoichi OI ,  Naoki TAKABAYASHI ,  Junji TANAKA ,  Fumio TAKAHASHI ,  Shigekazu NISHIMOTO ,  Mitsuhiro KONDO ,  Tatsuro OCHI ,  Shoichi SUZUKI

IPC: F16F1/02 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46 ,  C21D9/02 ,  C21D8/06 ,  C21D6/00 ,  C21D1/06 ,  C21D1/30 ,  C23C8/26 ,  F16F1/04

CPC classification number: F16F1/021 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C22C38/46 ,  C21D9/02 ,  C21D8/065 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D1/06 ,  C21D1/30 ,  C23C8/26 ,  F16F1/04 ,  C21D2211/008 ,  F16F2224/0208

Abstract: A damper spring having an excellent fatigue limit is provided. A damper spring according to the present embodiment includes a nitrided layer formed in an outer layer, and a core portion that is further inward than the nitrided layer. The chemical composition of the core portion consists of, in mass%, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, 5: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/μm2.

公开(公告)号：US20230287963A1

公开(公告)日：2023-09-14

申请号：US18117965

申请日：2023-03-06

Applicant: TSUBAKIMOTO CHAIN CO.

Inventor： Yuhi Hirata ,  Kazuyuki Ebinuma

IPC: F16G13/06

CPC classification number: F16G13/06 ,  C21D1/06

Abstract: The present invention aims at providing a chain with excellent wear resistance, which minimizes chain elongation, reduces vibration and noise, and improves drive efficiency. The chain according to the present invention includes at least a plurality of link plates and a plurality of pins as chain components. The pins and mutually sliding chain components sliding against the pins are formed with a hardened surface layer containing one of Cr carbide, Ti carbide, V carbide, Nb carbide, Cr nitride, Ti nitride, V nitride, and Nb nitride on part or all of respective sliding surfaces. In the case where the chain includes bushings as chain components and the bushings are the mutually sliding chain components, the bushings are formed with the hardened surface layer on part or all of their sliding surfaces.

公开(公告)号：US20190233912A1

公开(公告)日：2019-08-01

申请号：US16317732

申请日：2017-06-08

Applicant: Sumitomo Electric Industries, Ltd. ,  Sumitomo (SEI) Steel Wire Corp.

Inventor： Fuminori Okada ,  Kenichi Shimizu ,  Takafumi Uwano

IPC: C21D9/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/34

CPC classification number: C21D9/02 ,  B21C1/003 ,  B21C3/02 ,  B21F35/00 ,  C21D1/06 ,  C21D7/06 ,  C21D8/065 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/24 ,  C22C38/34

Abstract: A steel wire for a spring is formed of a steel containing from 0.5% by mass to 0.8% by mass of carbon, from 1.0% by mass to 2.5% by mass of silicon, from 0.2% by mass to 1.0% by mass of manganese, and from 0.5% by mass to 2.5% by mass of chromium, the balance being iron and incidental impurities. The steel has a tempered martensite structure. The hardness of a surface region that is a region within 10 μm from an outer surface is from more than 0 HV to 50 HV higher than the hardness of a region other than the surface region.

公开(公告)号：US20190194793A1

公开(公告)日：2019-06-27

申请号：US16210078

申请日：2018-12-05

Applicant: GE AVIO S.R.L.

Inventor： Lorenzo Rigo ,  Andrea Piazza ,  Diana Di Gioia

IPC: C23C8/38 ,  C23C8/02

CPC classification number: C23C8/38 ,  C21D1/06 ,  C21D9/32 ,  C22C38/44 ,  C22C38/52 ,  C23C8/02 ,  C23C8/34

Abstract: Methods for treating steel, along with the resulting treated steel, are provided. The method may comprise: nitriding a carburized Ferrium steel component such that the Ferrium steel component has a surface portion with a nitrogen content that is greater than 0% to about 5% by weight. Nitriding the Ferrium steel component may increase the surface hardness of the Ferrium steel. The surface portion may have a nitrogen content of about 0.05% to about 0.5% by weight.

公开(公告)号：US20180363694A1

公开(公告)日：2018-12-20

申请号：US16060388

申请日：2016-12-06

Applicant: NTN CORPORATION

Inventor： Yasunobu OHNO

IPC: F16C3/02 ,  F16C33/62 ,  F16C33/64 ,  C21D9/40 ,  C23C8/32

CPC classification number: F16C3/02 ,  C21D1/06 ,  C21D1/18 ,  C21D9/40 ,  C21D2211/001 ,  C23C8/32 ,  F16C33/36 ,  F16C33/546 ,  F16C33/62 ,  F16C33/64 ,  F16C33/6677 ,  F16C2361/61

Abstract: The present invention relates to a bearing shaft provided with an outer peripheral surface that includes a raceway surface (side surface) on which a rolling element rolls. The bearing shaft is made of steel containing carbon of 0.7% or more. The raceway surface is formed with a nitrogen-enriched layer. The absolute value of compressive residual stress in the surface of the nitrogen-enriched layer (i.e., the surface of a hardened layer which is formed on the side surface of the bearing shaft by shot peening) is 600 MPa or more and 1700 MPa or less. Thereby, it is possible for the present invention to prolong the operation life of a bearing.

公开(公告)号：US20180347025A1

公开(公告)日：2018-12-06

申请号：US15778153

申请日：2016-11-25

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Akira SHIGA ,  Hajime HASEGAWA ,  Manabu KUBOTA ,  Hideo MIZUKAMI

IPC: C23C8/22 ,  C23C8/32 ,  C23C8/80 ,  C21D9/32 ,  C21D9/28 ,  C21D8/00 ,  C21D1/06 ,  C22C38/54 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D1/06 ,  C21D8/06 ,  C21D9/28 ,  C21D9/32 ,  C22C38/00 ,  C22C38/60 ,  C23C8/22 ,  C23C8/80

Abstract: A steel according to an aspect of the present invention has a chemical composition within a predetermined range, in which a hardenability index Ceq ranges from greater than 7.5 to smaller than 44.0, an AlN precipitation index IAlN ranges from greater than 0.00030 to smaller than 0.00110, a metallographic structure includes ferrite ranging from 85 to 100 area %, an average distance between sulfides, which are observed in a cross section parallel to a rolling direction of the steel and have an equivalent circle diameter ranging from 1 μm or greater to smaller than 2 μm, is shorter than 30.0 μm, and a presence density of the sulfides, which are observed in the cross section parallel to the rolling direction of the steel and have an equivalent circle diameter ranging from 1 μm or greater to smaller than 2 μm, is 300 pieces/mm2 or more.