奥氏体不锈钢中硫含量的研究

Research on sulfur content of austenitic stainless steel

通过对不同硫含量铸坯和成品硫化物夹杂大小以及等级进行分析,研究了奥氏体不锈钢中硫含量对性能的影响。结果表明,随着硫含量的增加,不锈钢铸坯和成品中最大夹杂物尺寸逐步增加,成品夹杂物等级也相应提高,当硫的质量分数不大于21×10^(-6)时,成品硫化物夹杂低于最小评级要求;奥氏体不锈钢冲击性能与硫含量呈反比例关系,当硫的质量分数高于75×10^(-6)时,可能导致304不锈钢脆断。

The effect of sulfur content on the properties of austenitic stainless steel was studied by analyzing the sizes and grades of the sulfide inclusions in the casting slab and finished product with different sulfur content. The results showed that the maximum sulfide inclusion size in the casting slab and product was gradually increased with the increase of sulfur content, and so was the inclusion grade of the product. The sulfide inclusion in the product was lower than the minimum requirement of rating when the mass fraction of sulfur was not greater than 21×10^-6. The impact toughness of austenitic stainless steel was inversely proportional to sulfur content, and when the mass fraction of sulfur was higher than75 ×10^-6, it could cause brittle fracture of 304 stainless steel.