Method for producing steel sheet

鋼板の製造方法

Abstract

【課題】熱延鋼板の製造ラインにおいて、圧延設備に多大な負荷をかけることなく、最終フェライト粒径が3μm以下となる微細フェライト組織を有する鋼板を製造することができる鋼板の製造方法を提供する。 【解決手段】連続鋳造されたスラブ3を仕上圧延機7にてAr 3 変態点以上で所定の仕上板厚まで圧延し、仕上圧延終了直後0.4秒以内に急速冷却装置8による冷却を開始し、700℃/秒以上の冷却速度にて、(Ae 3 変態点−200℃)以下の温度まで急速冷却を行い、コイラー10で巻取る。 【選択図】図2
PROBLEM TO BE SOLVED: To provide a method capable of producing a steel sheet having a fine ferrite structure, the final ferrite grain size of is ≤3μm without burdening a rolling apparatus significantly in a production line for a hot rolled steel sheet. SOLUTION: A continuously cast slab 3 is rolled at an Ar 3 transformation point or above to a prescribed finish sheet thickness by a finish rolling mill 7, within 0.4 s directly after the completion of the finish rolling, cooling by a rapid cooling apparatus 8 is started, and rapid cooling is performed to a temperature of (an Ae 3 transformation point-200°C) or below at a cooling rate of ≥700°C/s, so as to coil the same by a coiler 10. COPYRIGHT: (C)2007,JPO&INPIT

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Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    JP-2004058149-AFebruary 26, 2004Jfe Steel Kk, Jfeスチール株式会社熱延鋼帯の製造方法
    JP-2004143503-AMay 20, 2004Sumitomo Metal Ind Ltd, 住友金属工業株式会社熱延鋼板の製造方法

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Cited By (6)

    Publication numberPublication dateAssigneeTitle
    CN-101616754-BAugust 17, 2011住友金属工业株式会社Process for producing hot-rolled steel sheet having fine ferrite structure and hot-rolled steel sheet
    CN-105478472-AApril 13, 2016鞍钢股份有限公司Hot rolling method for wide and thin size high-strength cold-rolled base plate for automobile
    KR-101120818-B1March 26, 2012수미도모 메탈 인더스트리즈, 리미티드Process for producing hot-rolled steel sheet having fine ferrite structure and hot-rolled steel sheet
    US-8404060-B2March 26, 2013Nippon Steel & Sumitomo Metal CorporationMethod for manufacturing hot-rolled sheet having fine-grained ferrite, and hot-rolled sheet
    US-9034118-B2May 19, 2015Nippon Steel & Sumitomo Metal CorporationMethod for manufacturing hot-rolled sheet having fine-grained ferrite, and hot-rolled sheet
    WO-2008096394-A1August 14, 2008Sumitomo Metal Industries, Ltd.微細フェライト組織を有する熱延鋼板の製造方法、及び熱延鋼板