DIN EN ISO 4507:2007
渗碳或碳氮共渗的烧结铁基材料.通过显微硬度试验测定和验证表面硬化深度
Sintered ferrous materials, carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test (ISO 4507:2000)English version of DIN EN ISO 4507:2007-05