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Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
September 7, 2021
Patent Application Number
20160930
Date Filed
September 30, 2016
Patent abstract
A steel for cold forging has a predetermined chemical composition, satisfies d+3σ≤10.0 and SA/SB<0.30, includes 1200/mm2 or more of sulfides having an equivalent circle diameter of 1.0 to 10.0 μm in a microstructure, and has an average distance between the sulfides of less than 30.0 μm. Here, d is an average value of equivalent circle diameters of sulfides having an equivalent circle diameter of 1.0 μm or more, σ is a standard deviation of the equivalent circle diameters of the sulfides having an equivalent circle diameter of 1.0 μm or more, SA is the number of sulfides having an equivalent circle diameter of 1.0 μm or more and less than 3.0 μm, and SB is the number of the sulfides having an equivalent circle diameter of 1.0 μm or more.
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