我厂所铸造的筛篦板,一直采用Cr-Mn-N系奥氏体耐热钢。其化学成分如表1。由于此钢种N的含量较大,同时Cr和Mn含量较高,而Cr和Mn恰恰又是促进钢液气体溶解度增加的元素。因此,总的来说,CrMnN钢种对气体的敏感性很强,常常因铸件形成大量的气孔和疏松而影响使用质量。一套有气孔的筛篦板往往只能使用三个月左右。筛篦板所呈现的气孔,为单独和连续不断 I plant cast grate plate, has been using Cr-Mn-N austenitic heat-resistant steel. The chemical composition in Table 1. Due to the large content of N in this steel and the high content of Cr and Mn, Cr and Mn are precisely the elements that promote the increase of molten steel gas solubility. Therefore, in general, CrMnN steel is highly sensitive to gases and often affects the quality of use due to the large number of pores and loose castings. A perforated screen grate plate often only use about three months. Grate plate presented by the pores, as a separate and continuous