Method for exposing surface defects on hot steel blanks

Details Method for exposing surface defects on hot steel blanks Method for exposing surface defects on hot steel blanks

1975-01-24

1976-01-20

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

72 40, 134 19, 134 34, C21D 182, C23F 704

Patent

active

039335321

ABSTRACT:
The present method makes it possible to expose or make visible surface defects on or in the surface of steel blanks by heating the blanks to a temperature below the hot working temperature of the particular type of steel and thereafter rapidly descaling the blanks by means of high pressure water which contacts the steel for a limited time so as to avoid a substantial chilling or quenching. After such descaling the blanks are cooled at a controlled rate to thereby produce an oxidation film on the descaled surface which film makes the defects visible.

REFERENCES:
patent: 1898809 (1933-02-01), Berg
patent: 2282397 (1942-05-01), Deck
patent: 2394514 (1946-02-01), Evans et al.

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