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1. (EP3121305) FAVORABLY WORKABLE STEEL WIRE AND METHOD FOR PRODUCING SAME
注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。
Claims

1. An excellent workability steel wire rod comprising steel components including, by mass%, C: 0.20 to 0.60%, Si: 0.15 to 0.30%, Mn: 0.25 to 0.60%, P: ≤.020%, S: ≤0.010%, and a balance of Fe and unavoidable impurities, and having an inside microstructure including cementite,
wherein by number ratio, 80% or more of the cementite in a cross-section vertical to a longitudinal direction of the wire rod has a short axis of 0.1 µmor less and a ratio of a long axis to the short axis, defined as an aspect ratio, of 2.0 or less.
  2. The excellent workability steel wire rod according to claim 1 further containing, in addition to said steel components, by mass%, one or more of Al: 0.06% or less, Cr: 1.5% or less, Mo: 0.50% or less, Ni: 1.00% or less, V: 0.50% or less, B: 0.005% or less, and Ti: 0.05% or less.
  3. A method for production of an excellent workability steel wire rod excellent in drawability and forgeability comprising heating a billet of a chemical composition according to claim 1 or 2 to 950°C to 1080°C, supplying the billet to a wire rod rolling process to obtain a wire rod, coiling the wire rod in a temperature region of 750°C to 900°C, then subjecting the wire rod to in-line heat treatment by a molten salt of 400°C to 430°C, and ejecting the molten salt to the wire rod being dipped in the molten salt at a stirring flow rate of 0.5 m/s to 2.0 m/s in range.