[MW:22679] Lateral Expansion - High Alloy Impact test

Dear Metallurgists ,

Could you please explain that,

why lateral expansion value of Min. 0.38 mm given in ASME Sec VIII Div I , UHA-51 for Charpy Impact Tests, instead of Joule Value for High Alloy steels like Duplex, Super Duplex etc.

What is the significance of Lateral expansion for such High Alloys.

Regards,

Saravanan.

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