Title:
METHOD AND DEVICE FOR INSPECTING SURFACE OF STEEL BLANK AT HIGH TEMPERATURE OF CURIE POINT OR MORE
Document Type and Number:
Japanese Patent JPS58165005
Kind Code:
A
Abstract:
There is disclosed a method and arrangement for inspecting the surface of steel stock having a temperature above the Curie point. In order to detect, with a great certainty and accuracy, defects in the hot steel stock, with a loss of energy for cooling the steel stock for inspection and subsequently reheating it for further processing being avoided, only a thin surface layer of the steel stock is intensively cooled on the surface to be inspected, to a temperature below the Curie point. The core of the steel remains hot. Immediately thereafter, a magnetic or electromagnetic field is induced in the cooled surface layer and disturbances in the induced field caused by defects in the steel stock are detected and recorded by pick-ups.
Inventors:
ANTON FUREEKU
BUORUFUGANGU POORANSHIYUTSUTSU
BUORUFUGANGU POORANSHIYUTSUTSU
Application Number:
JP1553383A
Publication Date:
September 30, 1983
Filing Date:
February 03, 1983
Export Citation:
Assignee:
VOEST AG
International Classes:
G01B7/00; G01B7/34; G01N27/82; G01N27/90; G01N29/04; (IPC1-7): G01B7/34; G01N27/90; G01N29/04
Domestic Patent References:
| JPS5043710U | 1975-05-02 |
Attorney, Agent or Firm:
Takehisa Ito