標準號：IS 4432-1988
發布日期：1989/2/14 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：Covers the technical delivery requirements for wrought low carbon unalloyed and alloyed steel bars, billets, rods and finished forgings for case-hardening.1.1 The steels are, in general, intended for forgings and fabrication of case-hardened machine or automobile parts.1.2 Case-hardening of parts means which are carburized or carbonitrided on their surface and subsequently hardened to produce a high degree of hardness in the surface zone, whilst the core material is characterized by relatively good toughness.