-
公开(公告)号:US20180030563A1
公开(公告)日:2018-02-01
申请号:US15546098
申请日:2016-01-25
发明人: Keisuke ANDO , Kazuaki FUKUOKA , Kunikazu TOMITA
IPC分类号: C21D9/32 , C22C38/26 , C22C38/24 , C22C38/28 , C22C38/06 , C21D6/00 , C22C38/02 , C22C38/00 , C21D1/28 , C21D1/18 , C23C8/22 , C22C38/32 , C22C38/04
CPC分类号: C21D9/32 , C21D1/06 , C21D1/18 , C21D1/28 , C21D6/002 , C21D6/005 , C21D6/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/60 , C23C8/22
摘要: A case hardening steel having excellent fatigue resistance is provided at relatively low production cost. A case hardening steel has a chemical composition containing C: 0.10% to 0.30%, Si: 0.10% to 1.20%, Mn: 0.30% to 1.50%, S: 0.010% to 0.030%, Cr: 0.10% to 1.00%, B: 0.0005% to 0.0050%, Sb: 0.005% to 0.020%, and N: 0.0150% or less in a predetermined range, and further containing Al: 0.010%≦Al≦0.120% in the case where B−(10.8/14)N ≦0.0003%, and 27/14[(N−(14/10.8)B+0.030]≦Al≦0.120% in the case where B−(10.8/14)N
-
公开(公告)号:US20230029298A1
公开(公告)日:2023-01-26
申请号:US17757601
申请日:2020-12-23
摘要: Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 μm per mm2, 500 or more sulfide particles with an equivalent circle diameter of 1 μm or more and 5 μm or less per mm2, and 1000 or more Pb particles with an equivalent circle diameter of 1 μm or less per mm2, wherein A value=(Mn+5Cr)/S (1) here, symbols of elements in the formula indicate contents (% by mass) of the elements.
-
公开(公告)号:US20200248291A1
公开(公告)日:2020-08-06
申请号:US16488687
申请日:2018-02-27
IPC分类号: C22C38/60 , B23B5/08 , C22C38/18 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
摘要: Provided is a wire rod that has superior machinability by cutting regardless of the type of tool material and the type of lubricant and even in the case where no lubricant is used. A wire rod for cutting work comprises: a specific chemical composition; and Vickers hardness that satisfies the following expressions (1) and (2) in the case where an average aspect ratio of ferrite grains at a position of 1/4 of a diameter from a surface of the wire rod for cutting work is more than 2.8, and satisfies the following expressions (3) and (4) in the case where the average aspect ratio is 2.8 or less, Have≤350 (1) Hσ≤30 (2) Have≤250 (3) Hσ≤20 (4).
-
-