EDDQ級高成形性冷軋IF鋼片開發

Development of EDDQ Grade High-formable Cold-rolled IF Steel Sheets

陳煌泉(H. C. Chen) ； 張六文(L. Chang) ； 李炳坤(P. K. Lee) ； 許煥亮(H. L. Shu)

《鑛冶：中國鑛冶工程學會會刊》 44卷4期 (2000/12) Pp. 105-117

https://doi.org/10.30069/MM.200012_44(4).0012

摘要

本研究乃利用不同合金含量之極低碳IF鋼，以開發耐二次加工脆化之EDDQ級高成形性冷軋鋼片。研究結果顯示降低鋼胚再加熱溫度（SRT）、降低C含量或增加有效Ti均可提高r值，其中降低鋼胚再加熱溫度及降低有效Ti可降低轉脆溫度，添加Nb可降低轉脆溫度。提高盤捲溫度（CT）對轉脆溫度影響不大，但可降低再結晶溫度及材料強度。提高冷軋率可提高材料r值並降低△r值，因而降低轉脆溫度。由研究結果設計適當之成份及製程，經現場試製後，鋼料性質可達到一般EDDQ之目標值。

關鍵字

IF鋼 ； 成形性 ； 冷軋鋼片 ； 二次加工脆化

並列摘要

Extra low carbon IF steels with different alloy contents were used to develop EDDQ grade cold-rolled steels with high resistance to secondary work embrittlement. Experimental results showed that decreasing slab reheating temperature (SRT) and carbon content or increasing titanium content increased r-value of the steels. Decrease of SRT and titanium content or addition of niobium was beneficial to the resistance to secondary work embrittlement. Coiling temperature revealed little effect on transition temperature, while increasing coiling temperature decreased recrystallization temperature and material strength. Increasing cold reduction increased r-value and decreased △r value, thus promoted the resistance to secondary work embrittlement. Mill tryout showed that EDDQ grade steel was obtained with proper alloying and processing design.

並列關鍵字

IF steel ； Formability ； Cold-rolled steel ； Secondary work embrittlement