The principle of cryo-blasting the scale is that it happens rapidly enough with dry ice powder or with liquid nitrogen, that the scale cools first, does not particularly transfer heat from the metal to cool it much, and therefore shrinks drastically first, and becomes a  powder that the gases leaving the tube carry with the flow.

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The principle of cryo-blasting the scale is that it happens rapidly enough with dry ice powder or with liquid nitrogen, that the scale cools first, does not particularly transfer heat from the metal to cool it much, and therefore shrinks drastically first, and becomes a  powder that the gases leaving the tube carry with the flow.