標準號：IS 1570 Pt.3-1979
發布日期：1979/10/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This schedule ( Part III ) is applicable to standards for carbon and carbon-manganese free cutting steels supplied to a specified composition (see Table 1 ).TABLE 1 SPECIFIED CHEMICAL COMPOSITION FOR THE STANDARD STEELSC Si Mn S PDesignation Percent Percent Percent Percent PercentNew Old(1) (2) (3) (4) (5) (6) (7)10C8S10 (10S11) 0.15 Max 0.05-0.30 0.60-0.90 0.08-0.13 0.060 Max14C14S14 (14MnlS14) 0.10-0.18 0.05-0.30 1.20-1.50 0.10-0.18 0.060 Max25C12S14 (25MnlS14) 0.20-0.30 0.25 Max 1.00-1.50 0.10-0.18 0.060 Max40C10S18 (40S18) 0.35-0.45 0.25 Max 0.80-1.20 0.14-0.22 0.060 Max11GI0S25 (11S25) 0.08-0.15 0.10 Max 0.80-1.20 0.20-0.30 0.060 Max40C15S12 (40Mn2S12) 0.35-0.45 0.25 Max 1.30-1.70 0.08-0.15 0.060 MaxNote 1 —The steel may be supplied in killed or semi-killed type. In case of killed steel, minimum silicon level should be 0.10 percent.Note 2 — When required lead and other elements are specified as added elements.