... (Mechanical Properties equilibrium) ;3) Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, Bright Annealing, Normalized, Quenched and Tempered ... boxes, wooden slats as requires.9) Main Applications: Automobile and Bearing Industry, Mechanical and Structral Purpose, Boiler and Heat Exchanger, Hydraulic and Petrochemical Purpose, etc.