摘要:
基于烘烤硬化钢的冶金特性,通过合理的成分设计和采取相应的冶炼、热轧、热镀锌工艺,成功开发了屈服强度220 MPa级热镀锌烘烤硬化钢H220BD+Z。工业试制结果表明:试验钢完全能满足屈服强度Rp0.2220~270 MPa,抗拉强度Rm320~400 MPa,延伸率A80≥32%,r90≥1.5,n90≥0.16,BH2≥30 MPa的技术要求,具有良好的成形性能和烘烤硬化性能;成品镀层均匀,钢板的可镀性良好;钢板经150 d自然时效后,试样拉伸时仍然呈现光滑的拉伸曲线,抗拉强度、屈服强度基本无变化,但是塑性指标有所下降,其抗室温时效性能较好。产品可应用于汽车覆盖件。
关键词:
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烘烤硬化钢 /
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组织 /
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性能 /
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时效特性
Abstract:
Considering the metallurgy characteristic of baking hardening steels,the YS220 MPa grade baking hardening steel was developed by suitable alloying design and optimizing smelting,hot-rolling and galvanizing processes.The results show the steel has 220～270 MPa yield strength,320～400 MPa tensile strength,A80≥32%,r-value ≥1.5,n-value ≥0.16 and BH2 value≥30 MPa,and excellent formability and good bake-hardening behavior.The coating layer of sheet is even..After aging 150 days,the steel still has the smooth tensile curve and constant mechanical properties except decreasing r-value.The steel is well used in automobiles for exposed panels with excellent aging behavior within room temperature.
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