Detailed Product Description Steel Grade: J55, N80, L80, etcProduct particular communication:1) Size: 6.35 - 114.3 mm (OD) x 0.89 - 15mm (WT) ;2) Tight tolerance, Smooth surface, Uniform mechanical property(Mechanical Properties equilibrium) ;3) Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, Bright Annealing, Normalized, Quenched and Tempered, ...