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Invention Grant
CN105772665B 350㎜直径的34CrMo圆管钢坯及其炼制方法 有权

350㎜直径的34CrMo圆管钢坯及其炼制方法
Abstract:
本发明公开了一种350㎜直径的34CrMo圆管钢坯及其炼制方法，属于钢管炼轧领域。提供一种合金成份含量合理，内部晶像结构中中心偏析低的34CrMo圆管钢坯及其炼制方法。所述的34CrMo圆管钢坯包括C、Si、Mn、P、S、Cr、Mo、Cu、Ni，残余元素Nb％、Ti、B、V+Nb+Ti+B+Zr、As、Sn、As+Sn+Pb+Sb+Bi以及Fe；其中，成品34CrMo圆管钢坯的疏松度为0.5～1.0级，疏松区域面积比例24.8％～25.0％，金属原位分析致密度的中心区域为0.81～0.82。所述的炼制方法包括转炉冶炼、LF炉精炼、RH精炼以及φ350mm断面的34CrMo圆管钢坯连铸几个步骤。
Abstract(English):

The invention discloses a 34CrMo round pipe billet with the diameter being 350 mm and a smelting method of the 34CrMo round pipe billet and belongs to the field of steel pipe smelting and rolling. The 34CrMo round pipe billet with the reasonable alloy component content and low in center segregation in an inner crystal structure and the smelting method of the 34CrMo round pipe billet are provided. The 34CrMo round pipe billet comprises C, Si, Mn, P, S, Cr, Mo, Cu, Ni and residual elements of Nb, Ti, B, V+Nb+Ti+B+Zr, As, Sn, As+Sn+Pb+Sb+Bi and Fe, wherein the porosity of the finished 34CrMo round pipe billet ranges from 0.5 level to 1.0 level, the loose region area proportion ranges from 24.8% to 25.0%, and a central zone of metal in situ analysis density ranges from 0.81 to 0.82. The smelting method includes the steps of converter smelting, LF furnace refining, RH refining and continuous casting of the 34CrMo round pipe billet with the diameter phi of the section being 350 mm.

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