... .24- 63.5mm) Length:Random Length, Fixed Length, SRL, DRL Steel Grade: API 5L: GR B, X42, X46, X56, X60, ... Heat treatment:Annealed: Bright annealed,Spheroidize annealed, Normalized, Stress relieved, Cold finished, Quenched and Tempered Delivery Condition:BKS, NBK, BK, BKW ... wall panel, economizer, super heater, boiler and heat exchanger with seamless steel tubes, and to transport liquid, gas, oil etc.