C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/18 (2006.01) C21C 7/00 (2006.01) C21C 7/064 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/60 (2006.01)
Patent
CA 2355482
A machine structure steel superior in chip disposabil- ity and mechanical properties which contains sulfide-type inclusions such that those particles of sulfide-type inclu- sions with major axes not shorter than 5µm have an average aspect ratio not larger than 5.2 and which also contains coarse particles of sulfide-type inclusions such that the following relation is satisfied. a/b <= 0.25 where, a denotes the number of particles of sulfide-type inclusions with major axes not shorter than 20 Vim, and b denotes the number of particles of sulfide-type inclusions with major axes not shorter than 5 µm. The machine structure steel exhibits good chip dispos- ability and mechanical properties despite its freedom from lead.
Hoshikawa Ikuo
Kaiso Masato
Kimura Sei
Sakamoto Koichi
Shindo Yosuke
Kabushiki Kaisha Kobe Seiko Sho (kobe Steel Ltd.)
Riches Mckenzie & Herbert Llp
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