Impact Values at -50 Deg C for LTCS Material

Dear All,

If i were to use LTCS material, A333 Gr. 6 upto -50 Deg C(Design temp is -50 Deg C), what would be the Minimum Required Charpy V-Notch Impact Values as per ASME B 31.3/ASTM A333.

I dont want go for Charpy Impact Test Temperature Reduction as per Table 323.3.4 ASME B31.3

Thanks in anticipation.

YJ