The copper tube adopts phosphorus deoxidized copper, silver copper or alloy of Chromium and Zirconium of good heat- transfer as materials, formed and finished though extension, anneal, machining, etc, which has great basic strength, high recrystallization temperature and high rigidity. In orderto compensate the shrinkage of liquid steel when it solidifies into bloom shell, contoured core bar is used to draw the inside surface of copper in line with different types of steel grade into parabola type, diamond type and back taper surface of double-cone and single-cone with continuous taper. To improve the wearing resistance of copper tube inner wall, 006-O.08mm coating or composite Chrome is plated on the surface of copper tube, so that its surface hardness can reach HV900.
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