標準號：IS 4454 Pt.3-1975
發布日期：1975/4/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard ( Part III) covers the requirements for alloyed, oil hardened and tempered valve spring wire and spring steel wire which are used for manufacturing cold formed helical springs, volute springs, etc, working under moderately elevated temperatures and where it is not possible to use material covered in Part II or Part IV of this standard. This material is generally classified into 2 groups as follows:a) Alloyed, oil hardened and tempered spring steel wire used for statically stressed springs ( Grades 1 S and 2 S); andb) Alloyed, oil hardened and tempered valve spring steel wire used for dynamically stressed springs ( Grades I D and 2D).