Direct reading spectrometer made by German OBLF
100% chemical analysis of steel ingots for each lot
Inspection of non-metallic inclusion in raw material
100% sampling test for each lot
Test of temperature uniformity of heat treatment furnace
Check the loading condition before entering the furnace(loading weight、number of bars、forging spacing)
Ensure the time of quenching into water within 50s
Control the water temperature below 40℃（by two sets of cooling system)
Control and record furnace temperature uniformity curve
Visual inspection
Visual inspection
Hardness test
Ultrasonic test
Magnetic /Penetrant test
Positive material identification
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