Specification range: Heat treatment: BK, BKS, GBK, NBK, Stress Relief, Normalizing, Spheroidize Anneal, Annealing, OD: 1/4"-12" Executive Tube Standard: JIS ... G3461 Carbon steel boiler and heat-exchanger tube Product particular communication: 1) Size: OD ... etc; 8) Manufacture methods: Cold Finished and Hot Finished. and Heat-Exchanger Steel Tube