FIELD: metallurgy.
SUBSTANCE: method includes application on steel surface of duplex coating, bottom layer of which contains 30-40 wt % Al2O3 and 60-70 wt % SiO2, but top layer - 60-70 wt % SiO2, 15-20 wt % Na2O + K2O and 10-25 wt % Fe3O4.
EFFECT: additives of iron oxides into top layer of coating increase emissivity of this layer and provide well warming up of blank.
1 tbl, 1 ex
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| SLAG FOR HEATING AND WELD-DEPOSITING METALS AND ALLOYS | 1997 |
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| PROTECTIVE TECHNOLOGICAL GLASS CERAMIC-TYPE COATING FOR LOW-ALLOY OF UNSTABLE STEELS | 2011 |
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