Specification range: Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, OD: 1/4"-12" ... property(Mechanical Properties equilibrium); 3) Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, Bright Annealing, Normalized, Quenched ...