直读光谱法测定CD4MCu不锈钢中碳、镍、铬、铜、钼

应用光电直读光谱法测定了不锈钢(CD4MCu)中碳、镍、铬、铜及钼5种元素。通过下述三项措施提高了方法的准确度和精密度:共存元素的干扰校正;增加制作各元素的标准工作曲线时所用的标准样品数,用了两套标准共13块光谱分析用标准样品;选择样块上合适部位作为光谱激发点。上述5种元素的测量范围(质量分数)依次为0.02%～0.35%,3.50%～28.0%,6.50%～32.0%,0.05%～5.0%及0.05%～4.0%。对方法的精密度做了试验,测得相对标准偏差(n=11)为碳4.8%,镍、铬、钼0.4%,铜2.3%。应用此方法分析了5个不锈钢(CD4MCu)样品,所测得数据与用GB标准中化学法所测得的结果完全一致。

CD4MCu泵用铸件质量评定要求

在介绍CD4MCu铸造双相不锈钢各种物理、化学、力学、金相、焊接、热处理等性能并与含氮双相不锈钢CD4MCuN,以及奥氏体不锈钢CF-3M比较的基础上,提出了CD4MCu铸件质量评定的一些特殊要求。

直读光谱法测定CD4MCu不锈钢中的C，Ni，Cr，Cu，Mo

应用光电直读光谱法对CD4MCu不锈钢中碳、镍、铬、铜、钼进行测定。对样品的激发部位进行了探讨。通过共存元素的干扰校正、增加标样的数量，改善了工作曲线拟合线性关系和试样点的离散度。结果表明：该分析方法精密度高、准确性好、快速方便。测定CD4MCu不锈钢中碳、镍、铬、铜、钼含量时，元素的RSD为0．40～4．80％，碳测定范围为0．02-0．35％，镍的测定范围为3．50—28％，铬的测定范围为6．50～32％，铜的测定范围为0．05～5．00％，钼的测定范围为0．05～4．00％。

Corrosive-wear resistance of stainless steels for the impeller of slurry pump used in zinc hydrometallurgy process

This paper presents corrosive-wear (C-W) behaviors of three kinds of steels under the simulating condition oftraditional zinc hydrometallurgy process by using a self-made rotating disk apparatus. Result shows that pure wear lossrate is significantly larger than pure corrosion loss rate. Under this C-W condition, the ranking of C-W resistance is S2 >S3 > S1 (S1: austenite stainless steel; S2: CD-4MCu duplex stainless steel; S3 :17-4PH stainless steel). S2 has excellentC-W resistance due to strong surface deformation strengthening effect of high-density dislocations of the γ phase. S3 alsohas excellent C-W resistance owing to high hardness and strength. However, S1 does not show good C-W resistanceunder strong erosion of liquid-solid slurry because of its single-phase austenitic structure and very low hardness. As aresult, duplex stainless steels as well as 17-4 PH stainless steel can be used as impeller candidate materials in the zinchydrometallurgy process due to their excellent C-W resistance and lower cost.