... range: Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, OD: 1/4"-12" Executive Tube Standard: JIS G3461 ... ); 3) Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, Bright Annealing, Normalized, Quenched and Tempered, Solution Annealing, etc ...