Direct reading spectromete•♣r made by German OBLF
100% chemical analysis of steel i↔☆•ngots for each lot
Inspection of non-metallic inclusion i♣∏n raw material
100% sampling test for each lot
Test of temperature unifo ↓≈rmity of heat treatment ε÷≤£furnace
Check the loading condition befo≥₹≠re entering the furnace(lσ£≈♣oading weight、number of bars、fδ ∑orging spacing)
Ensure the time of que♦↕★nching into water within 5<±0s
Control the water temperature bel<♣π∏ow 40℃（by two sets of cλ∑ooling system)
Control and record furnace temperature£★ε₩ uniformity curve
Visual inspection
Visual inspection
Hardness test
Ultrasonic test
Magnetic /Penetrant test
Positive material identific'☆↔ ation
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