Cold Drawn/ Cold Rolled on the seamless steel tubes, to reach high accuracy on the OD and WT tolerance Heat Treatment, Annealing, Normalizing.
Quality Control: 1. Incoming Raw Material Inspection 2. Raw Material Segregation to avoid steel grade mix-up 3. Heating and Hammering End for Cold Drawing 4. Cold Drawing or Cold Rolling, On line inspection 5. Heat Treatment:Annealing, Normalizing, +A, +N 6. Straightening/Cutting to specified length/Finished Measuring Inspection 7. Quality Testing in own lab with Tensile Strength, Yield Strength, Elongation, Hardness, Straightness, etc. 8. Packing and Stocking.
100% Eddy Current Testing. 100% Size Tolerance Checking. 100% Tube surface checking to avoid surface defects.
Annealing Structural Pipe
ST35, St45, ST52
BK, BKW, BKS, GBK, NBK
OD: 6-256mm, WT: 1-30mm
Bao Steel, Xingcheng Steel, Huai Steel, Zhongtian Steel