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耐滲碳粗晶冷鍛用低合金鋼之開發

Development of Anti-Grain-Coarsening Low alloy Steel for cold forging Use

摘要


為降低製造成本提升競爭力,引擎活塞銷零件業者已開始採用連續冷鍛取代車削方式,加工SCr420或SCM420滲碳用低合金鋼,製造並外銷美國。冷鍛加工初期遭遇熱軋材太硬須經軟化及球化等兩次退火,導致成本增加,另也出現因晶粒粗大致活塞銷壓壞值不足等問題。本研究針對省略軟化退火及耐滲碳粗晶等需求,經由調整鋼中Si,Mn含量及添加適量Al、Nb、Ti、B的方式,已找出可省略退火兼抑制滲碳粗晶之熱軋軟化材有效成份設計,並開發出鈮硼系與鈦硼系冷鍛兼耐滲碳粗晶之新鋼種與最適軋延條件,不僅可提升晶粒粗化溫度大於920℃以上,尚能提供熱軋軟化材,協助下游省略軟化退火成本,滿足引擎活塞銷業者對冷鍛兼耐滲碳粗晶用料之需求。

並列摘要


Continuous cold forging process has been gradually adopted for mass-production of piston pins with SCr420 or SCM420 low alloy steel. The advantages of continuous cold forging process are (1) it eliminates the need of soft annealing that increased the production cost and (2) it minimizes the grain coarsening that deteriorated the broken loads of the parts. This research developed a new low alloy design of Ti,B and Nb,B added steels by adjusting Si, Mn contents and adding Al、Nb、Ti、B micro elements. The new low alloy steels increase the grain coarsening temperature over 920℃ and optimize the hot rolling process of the steels to cut down the production cost.

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