6.4.2.2 Maximum Allowable Quench Delay Time (For immersion type Quenching) Quench delay time shall begin when the furnace door begins to open or when the first corner of a load emerges from a salt bath and when the last corner of the load is immersed in the water. Max. Time, Nominal Thickness, mm Seconds Up to 0.406 inch 5 0.432 to 0.787 7 0.813 to 2.286 10 2.311 and over 15 6.5 The heat treatment practice described in the above sections is typical. Optimum heat treatment cycle to achieve the property requirements of this specification shall be generated by the supplier shell be reported. MECHANICAL PROPERTIES 7.0 Tensile Properties 7.1 7.1.1 The sheet and plate shall conform to the requirement for tensile properties as specified in table 7.1.1 TABLE - 7.1.1. : TENSILE PROPERTY REQUIREMENT (A) Specified Yield Elongation min.,% Thickness, mm Tensile Strength at Product Temper strength 2% offset, In MPa min. In 5D or Over Through MPa min 50mm 5.65√A or 4D 110 O 0.40 6.30 ---- 16 ---- Sheet T 4 0.40 6.30 2.5 115 15 ---- T 6 0.40 6.30 300 255 8 ----
6.4.2.2 Maximum Allowable Quench Delay Time (For immersion type Quenching) Quench delay time shall begin when the furnace door begins to open or when the first corner of a load emerges from a salt bath and when the last corner of the load is immersed in the water. Nominal Thickness, mm Max. Time, Seconds Up to 0.406 inch 5 0.432 to 0.787 7 0.813 to 2.286 10 2.311 and over 15 6.5 The heat treatment practice described in the above sections is typical. Optimum heat treatment cycle to achieve the property requirements of this specification shall be generated by the supplier shell be reported. 7.0 MECHANICAL PROPERTIES 7.1 Tensile Properties 7.1.1 The sheet and plate shall conform to the requirement for tensile properties as specified in table 7.1.1 TABLE - 7.1.1. : TENSILE PROPERTY REQUIREMENT (A) Product Temper Specified Thickness, mm Tensile strength MPa min. Yield Strength at 2% offset, MPa min Elongation min.,% Over Through In 50mm or 4D In 5D or 5.65√A Sheet O 0.40 6.30 110 ---- 16 ---- T 4 0.40 6.30 2.5 115 15 ---- T 6 0.40 6.30 300 255 8 ----
IDT00446400000000000isro05401.docx