高铬铁素体不锈钢446盘条组织和性能

林仁敢,徐惠松

钢铁 ›› 2018, Vol. 53 ›› Issue (10) : 85-89.

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钢铁 ›› 2018, Vol. 53 ›› Issue (10) : 85-89. DOI: 10.13228/j.boyuan.issn0449-749x.20180093
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高铬铁素体不锈钢446盘条组织和性能

  • 林仁敢,徐惠松
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Microstructure and property for 446 wire rod of high chromium ferrite stainless steel

  • 林仁敢,徐惠松
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摘要

为了稳定和优化大生产工艺,对高铬铁素体不锈钢446(0.035C,0.50Mn,0.025P,0.003S,0.49Si,25.25Cr,0.030N)(质量分数,%)盘条在不同热处理工艺下的力学性能和微观组织进行研究。结果表明,经800 ℃恒温4.5 h退火后,盘条抗拉强度为540 MPa、屈服强度为377 MPa、断面收缩率为86.5%,晶粒度达到7.5级,446盘条具有最佳的综合力学性能;780~880 ℃退火处理对盘条晶粒度影响较小,高铬铁素体不锈钢很难通过热处理手段矫正其粗晶组织,而当退火温度超过920 ℃时盘条晶粒组织发生异常长大行为。通过将氮元素质量分数控制在0.08%~0.20%可有效抑制446N盘条晶粒粗化,晶粒度达到10.0级。

Abstract

In order to stabilize and optimize industrial production process,the microstructure and mechanical properties of wire rod of high-chromium ferrite stainless steel 446 (/%:0.035C,0.50Mn,0.025P,0.003S,0.49Si,25.25Cr,0.030N) were researched in different annealed processes. The results showed that the optimum mechanical properties were achieved for the 446 wire rod after annealing at 800 ℃ for 4.5 h,with tensile strength of 540 MPa,yield strength of 377 MPa,area reduction of 86.5% and grain size rate of 7.5. As the grain size rate influenced less in trial temperature range of 780-880 ℃,the coarse crystal of high-chromium ferrite stainless steel was hard to be refined by annealing process. However,the grain would be growing extremely when the annealing temperature exceeded 920 ℃. The grain coarsening of 446 wire rod can be restrained effectively and the grain size rate can reach 10.0 with controlling the mass percent of N for 0.08%-0.20%.

关键词

高铬铁素体不锈钢 / 盘条 / 力学性能 / 显微组织

Key words

High-chromium ferrite stainless steel / wire rod / mechanical property / microstructure

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林仁敢, 徐惠松. 高铬铁素体不锈钢446盘条组织和性能[J]. 钢铁, 2018, 53(10): 85-89 https://doi.org/10.13228/j.boyuan.issn0449-749x.20180093
LIN Ren-Gan, XU Hui-Song. Microstructure and property for 446 wire rod of high chromium ferrite stainless steel[J]. Iron and Steel, 2018, 53(10): 85-89 https://doi.org/10.13228/j.boyuan.issn0449-749x.20180093

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