Weihai q345b seamless implementation of the external standard: GB709, the internal implementation of standards: GB/T1591-94. Q345 is a seamless steel pipe material. Q represents the yield of this material, behind the 345, the yield refers to the value of this material, in the 345 or so. As the thickness of the material will increase its value decreases yield 
 Q345B seamless steel pipe dimensions and tolerances 

 Standard deviation of outside diameter tolerance level 
 D1 ± 1.5%, minimum ± 0.75 mm 
 D2 ± 1.0%. Minimum ± 0.50 mm 
 D3 ± 0.75%. Minimum ± 0.30 mm 
 D4 ± 0.50%. ± 0.10 mm min 

 I plant 6-630mnq345b seamless steel pipe, wall thickness of 2-80mn, can call into the details! 
 Kai Shun Steel Pipe Co., Ltd. Liaocheng chat annual distribution in Chengdu, Baotou, Tianjin Steel, Lu Po, Anshan and other national production of several high-quality steel pipe, seamless steel pipe, alloy pipe, boiler pipe, galvanized steel, precision tube, 16mn, q345b seamless steel pipe and other products, there are nearly 2,000 kinds of specifications, is larger in North China seamless steel pipe suppliers. Various diameters can be customized for the user all kinds of non-grade steel. Company's existing 70 units of a perforation, perforation unit 60 sets 1, 2 sets of mill, 80 tons and 120 tons pulling machines and large-scale lifting of the two sets of equipment.