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管坯钢在200吨平炉中冶炼,并在弧形连铸机上浇注,铸坯断面尺寸为220×280mm。二次冷却水的消耗量0.30～0.45公升/公斤钢。将连锈坯在900/750轧机上加工成直径100—120mm的园管坯,再将其在140轧管机组上轧成壁厚为5～24mm、直径63.5～95mm的钢管。钢液按下述方案脱氧: Ⅰ)炉内用45％FeSi、FeMn、SiMn合金予脱氧,钢包内用45％YeSi及Al终脱氧。
Slab steel is smelted in a 200-ton open hearth furnace and cast on an arc-shaped continuous casting machine. The cross-sectional area of the slab is 220 × 280 mm. Secondary cooling water consumption 0.30 ~ 0.45 liters / kg steel. The continuous rust billet is processed into a round billet with a diameter of 100-120mm on a 900/750 rolling mill and then rolled into a steel tube with a wall thickness of 5-24mm and a diameter of 63.5-95mm on a 140- The molten steel is deoxidized according to the following scheme: Ⅰ) 45% FeSi, FeMn and SiMn alloy are deoxidized in the furnace, and the ladle is deoxidized with 45% YeSi and Al.