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박근웅(Keun Woong Park),문만빈(Man Been Moon),오현운(Hyun Woon Oh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In cold rolled steels the strength is increased essentially by precipitation hardening. Nb, Ti and V are most commonly used as the alloying elements to precipitate as carbonitrides and induce grain refinement in steels. In the present investigation, the effects of added Nb, such as improved the mechanical properties after batch furnace annealing. Annealing is used in the steel industry as an important step for heat-treatment. And batch annealing is widely used to produce steel sheets like automobile cold rolled steel sheets and sheets used for the manufacture of automobile parts. We developed a BAF simulator to estimate the effects of BAF conditions on the mechanical properties of 440㎫ grade HSS sheet. Conditions for the batch annealing process consist of various annealing time and temperature. 440㎫ HSS sheets require a yield strength (25~40㎏/㎟), tensile strength (≥45㎏/㎟) and elongation (≥34%). The optimum conditions of BAF 440㎫ grade HSS sheet are 15hr of soaking time and 710℃ of heating temperature at △T 30℃.
자동차부품용 SM45C강의 상자소둔 열처리 최적화 연구
박근웅(Keun Woong Park),문만빈(Man Been Moon),오현운(Hyun Woon Oh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Annealing softens steel hardened from cold working by the tandem mill and reversing mill. Many steelmakers using annealing process for machinability of cold steel sheet. In this study, batch type annealing is widely used to produce steel sheets like automobile cold rolled steel sheets and sheets used for the manufacture of automotive parts. We developed a BAF simulator to estimate the effects of BAF conditions on the mechanical properties of SM45C sheet for safety belt buckle . Conditions for the batch annealing process consist of various annealing time and temperature. SM45C sheets require a yield strength (30∼36㎏/㎟), tensile strength (43∼51㎏/㎟) and elongation (32∼37%). The optimum conditions of SM45C sheet for safety belt buckle are 20hr of soaking time and 710℃ of heating temperature at △T 30℃.