HOT ROLLING WIRE MATERIAL FOR WIRE DRAWING

• Main Authors: SAKAMOTO AKIRA, OFUJI YOSHIHIRO, HIRAGAMI DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 29.06.2017
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a hot rolling wire material for wire drawing suitable for applications capable of manufacturing an ultra fine steel wire excellent in strength and durability without conducting a patenting treatment by using a hot rolled wire material as a raw material.SOLUTION: There is provided a hot rolling wire material for wire drawing containing, by mass%, C:0.3 to 0.5%, Si:0.1 to 1.0%, Mn:0.3 to 1.0%, Cr:0.25 to 0.7%, Mn+2Cr:0.90 to 1.8% and the balance Fe with inevitable impurities with Al, N, P and S in the impurities limited to predetermined ranges, 70% of which consists a pearlite structure and having average cementite thickness t in the pearlite structure calculated by the formula (1) of 15 to 40 nm, maximum particle diameter of TiN in measurement area of 125 mmof less than 15 μm and diameter of 4.0 to 6.0 mm. t=average pearlite lamellar spacing×{100/(100-volume fraction of proeutectoid ferrite)}×C content×0.153 Formula (1).SELECTED DRAWING: None 【課題】熱間圧延線材を素材として、強度、延性に優れた極細鋼線の製造時にパテンティング処理を施すこと無しに製造できる用途に好適な伸線加工用熱間圧延線材を提供する。【解決手段】質量％で、Ｃ：０．３〜０．５％，Ｓｉ：０．１〜１．０％，Ｍｎ：０．３〜１．０％，Ｃｒ：０．２５〜０．７％，Ｍｎ＋２Ｃｒ：０．９０〜１．８％，を含有すると共に残部がＦｅ及び不可避不純物から成り、かつ不純物中のＡｌ，Ｎ，Ｐ，及びＳが所定の範囲に制限され、７０％以上がパーライト組織からなり、式（１）から求まる前記パーライト組織中の平均セメンタイト厚さｔが１５〜４０ｎｍであり、さらに測定面積１２５ｍｍ２中でのＴｉＮの最大粒径が１５μｍ未満である直径４．０〜６．０ｍｍの伸線加工用熱間圧延線材。ｔ＝平均パーライトラメラ間隔×｛１００／（１００−初析フェライトの体積率）｝×Ｃ含有量×０．１５３ ・・・式（１）【選択図】なし