关键词: 08Al钢, 包芯线用冷轧薄带, 退火, 组织, 力学性能, 平整率

Abstract: The influence of annealing processes ( continuous annealing at 820 ℃, bell type annealing at 670 °C and at 730 °C ) and flattening elongation (0.8% , 1.2% and 1.5% ) on structure and mechanical properties of 0.4 mm cold- rolled thin sheet of 08Al steel (0. 07% C, 0.05% Al, 0.004 0% N) for clad wire has been tested and studied. Results show that the structure of continuous-annealed thin sheet is ferrite + pearlite, it has higher yield strength (300 MPa) and strength-yield ratio (0. 78) , lower elongation (35% ) and poor plasticity, not suitable to press and shape; of bell type annealed at 730 °C the grains are coarse and uneven with poor shaping performance ； of bell type annealed at 670 °C the structure of thin sheet is recrystallized ferrite and particle- or chain-shaped free cementite, it has lower yield strength (252 MPa) and strength-yield ratio ( 0. 69) , higher elongation (48% ) and nice shaping performance; with increasing flattening elongation the yield strength and strength-yield ratio decrease first and then increase, and the elongation decreases, the suitable flatting elongation is about 1. 2% with nice shaping performance and better application results.