... : Bright annealed,Spheroidize annealed, Normalized, Stress relieved, Cold finished, Quenched and Tempered Delivery Condition:BKS, NBK, BK, BKW, GBK(+A), NBK ... structure, mechanical structure, water wall panel, economizer, super heater, boiler and heat exchanger with seamless steel tubes, and to transport liquid, gas, oil etc.