H13钢盐浴渗铬及其在热挤压模上的应用

Chromizing of Steel H13 in Molten Salt and Its Application for Hot Extrusion Dies

研究了H13钢经硼砂盐浴渗铬及渗碳后渗铬的组织和性能。结果表明,直接渗铬时,碳化铬层薄,次表层有贫碳区,而渗碳、渗铬处理后,碳化铬层较厚,次表层无贫碳区。将渗碳、渗铬工艺应用于H13钢铝型材热挤压模,模具使用寿命比渗氮模具提高50%以上,型材表面光洁度得以提高。

This paper deals with the microstructure and property of steel H13 chromized in molten salt and chromized after carburizing. As a result,for steel H13,the thickness of chrominium carbide layer is very thin ,the subsurface is a depleted carbon zone,however,the thickness of chrominium carbide layer chromized after carburizing is thicker,the subsurface has no depleted carbon zone. The application of chromizing after carburizing for hot extrusion dies used for shaping aluminium showed that its service life is more 50 percent longer and the fineness of the shaped aluminium is finer than that of nitrided dies.