光亮退火对SUS304DQ不锈精密带钢力学性能的影响

Influence of Bright Annealing Process on Mechanical Properties of SUS304DQ Stainless Precision Strip Steel

采用单向拉伸试验,研究了光亮退火对SUS304DQ不锈精密带钢力学性能的影响,总结出最佳的退火工艺参数。结果表明,随变形量增加,强度指标(HV、σ0.2、σm)上升,塑性指标(δ、φ)降低;对不同加工硬化程度的试样,在低温(300～450℃)下退火10～15min快冷后进行拉伸,其力学性能基本不变,退火软化效果不明显。在全氢环境下,高温(920～1200℃)保持3 min,快冷,该合金组织完全再结晶,且晶粒大小均匀,软化效果明显,表面质量好。通过试验得出,SUS304DQ不锈钢最佳光亮退火工艺为1020～1150℃全氢气氛下保温2 min,快冷。

The effects of bright annealing（BA） process on mechanical properties of SUS304DQ stainless precision strip steel were studied using tensile testing.The results show that the strength parameters（HV,σ0.2,σm） of the steel increase whereas the plasticity parameters（δ,φ） decrease with the increase of cold rolling deformation.The mechanical properties of samples with different degree of working hardening after low-temperature annealing at 300 ℃～450 ℃ for 10～15 min and rapid cooling have little change;the effects of softening is not obvious.In contrast,in all H2 condition,the same samples annealed at 920 ℃～1200 ℃ for 3 min and rapid cooling,can obtain obvious softening effects fully re-crystallization,and bright surface.Then the best BA process of SUS304DQ stainless precision strip steel is confirmed as annealing at 1020 ℃～1150 ℃ for 2 min and rapid cooling.