The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2018
Filed:
Oct. 19, 2011
Hideki Imataka, Kitakyushu, JP;
Masayuki Horimoto, Nishinomiya, JP;
Yusuke Usui, Kitakyushu, JP;
Yuya Gyotoku, Utsunomiya, JP;
Hideki Imataka, Kitakyushu, JP;
Masayuki Horimoto, Nishinomiya, JP;
Yusuke Usui, Kitakyushu, JP;
Yuya Gyotoku, Utsunomiya, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A steel for cold forging/nitriding has, by mass percent, C: 0.01 to 0.15%, Si≤0.35%, Mn: 0.10 to 0.90%, P≤0.030%, S≤0.030%, Cr: 0.50 to 2.0%, V: 0.10 to 0.50%, Al: 0.01 to 0.10%, N≤0.0080%, and O≤0.0030%, further according to need a specific amount of one or more elements selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, with the balance being Fe and impurities, and further satisfying the conditions of [399×C+26×Si+123×Mn+30×Cr+32×Mo+19×V≤160], [20≤(669.3×logC−1959.6×logN−6983.3)×(0.067×Mo+0.147×V)≤80], [140×Cr+125×Al+235×V≥160] and [90≤511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V≤170] are excellent in cold forgeability and machinability after cold forging.