Seamless steel pipe diameter with 75 mm, the tolerance is + 1.0 to 0.5 mm;
Seamless steel pipe diameter with 80 to 90 mm, the tolerance is + 0.8-1.3 mm;
Seamless steel pipe diameter with 95 to 120 mm, the tolerance is + 1.0 to 1.7 mm.
Tube Length: generally 2.3 to 6 meters (by mutual agreement).
Bending: straightening device without local bending degree no more than 10 mm per meter, the total curvature of not more than 1.0% of the total length.
Degree miter head tube: when the diameter of not more than 96 mm in diameter, cut oblique less than 6 mm;
Tube diameter of 95 to 120 mm, cut slope less than 8 mm.
Billet surface peeling or after peeling roughness Ra of 25 microns.
Exceeds the allowable deviation, not only piercing bite condition deteriorated, but also directly affect the quality of piercing and rolling mill adjustment.
