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熱軋高強度低降伏比JSH780Y汽車用鋼開發

Development of JSH780Y Automobile Steels with High Strength and Low Yield Ratio Properties

摘要


有別於傳統一般等級鋼材以肥粒鐵與波來鐵為顯微組織基地,雙相鋼採用軟質肥粒鐵與硬質麻田散鐵共同組成兩相的組織,因此兼具肥粒鐵之高延展性與麻田散鐵之高抗拉強度的雙重特性。汽車業者對零組件輕量化、美觀及造形多樣化的需求日益提高,往780MPa更高強度及高成形性等級汽車用鋼發展,已是不可避免的潮流。透過相關冶金與關鍵製程技術的充分掌握,中鋼使用兩階段冷卻控制技術,生成適量比例之肥粒鐵和麻田散鐵組織,並提高相分佈的均勻性,順利完成JSH 780Y熱軋高強度汽車用鋼開發。經驗證其鋼材機性均符合規格要求,且經車廠試用亦能滿足需要的加工性能。未來將持續朝向超高強度與良好成形性兼備的次世代汽車用鋼發展,以滿足汽車產業低成本、高功能、低能耗及高安全性的產業競爭力需求。

關鍵字

低降伏比 雙相鋼 汽車用鋼

並列摘要


Unlike traditional steels with main microstructure of ferrite and pearlite phases, dual-phase steels with soft ferrite and hard martensite have high ductility and high tensile strength. The automobile industry demands light-weight components and shape diversity. It is an inevitable trend to develop automobile steel of higher strength and formability. In 2015 CSC commercialized JSH780Y automobile steels that satisfied automobile industry demands. The JSH780Y automobile steels were manufactured using new metallurgical technology, hot-rolled proccess, and two-step cooling control technology. In the future, ultra-high strength and good formability automobile steel of the next generation will be developed to meet the demands of automobile industry.

並列關鍵字

JSH780Y two-step cooling automobile steel

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