Measure and reasons for the uneven thick-walled steel pipe

Jul 29 14:10 2014 Allice S Lee Print This Article

Steel pipe is the uneven thickness or wall thickness at the thinnest point of the same cross section along the longitudinal direction, and the nominal wall thickness of the thickest point of greater deviation phenomenon. Offline pipe wall thickness ratio leads to uneven thickness control directly reflect the level of the pipe mill, and some impact steel finished product rate.

Causing uneven wall thickness is thick-walled steel spiral puncher rolling centerline errors,Guest Posting two rolls of varying inclination or former head pressure adjustment amount is too small and so causes uneven, generally along the full length of the spiral steel pipe like distribution. The main measures are adjusted puncher rolling centerline so that the roll angle of the two are equal, according to the given parameter adjustment rolled sheet rolling machine. Straight uneven wall thickness reason is pre-worn saddle height adjustment mandrel inappropriate to wear when exposed to certain pre-mandrel side of the capillary, resulting in capillary contact surface temperature drop too fast, resulting in uneven thickness even pull concave defects. Even rolling the roller gap is too small or too large. Rolling machine centerline deviation. Single, double rack uneven reduction will cause the direction of the ultra-thin single stand pipe (thick), two-rack direction thick (thin) the linear symmetry bias. The main measures are adjusted pre-worn saddle height mandrel, the mandrel and the guarantee of the capillary. Replace the hole and rolled specifications should roll gap measure, the actual roll gap and rolling tables consistent. Optical centerline of the device to adjust the rolling, rolling machine centerline must be corrected when the annual overhaul. From the economic considerations, to meet the engineering requirements while minimizing costs, but often the result is easy to form the appearance of a small selection of the many varieties of pipe fittings in general, which is not conducive to the construction site materials management, regulation and design changes needed material substitution and so on. Therefore, the choice of pipe fittings, should be integrated security and economy, minimize pipe varieties appropriate. In addition, the construction site conditions, the level of construction, fittings procurement cycle and other factors, it should cause the necessary attention in the selection of the tube. Under the circumstances, we should also consider strengthening fittings, as well as the possibility of miter bend small diameter tube bending and other field.Head, tail tube wall thickness of the front because of uneven cut slope, bending through the large, tube-centering holes errors could easily lead to uneven wall thickness of the head seamless steel pipe. Perforation extension coefficient is too large, roll speed is too high, rolling instability. Puncher cast steel capillary instability could easily lead to the tail of uneven thickness. Measures to check the quality of the tube to prevent the tube front cut slope, depressed volume, replacement or repair should be corrected pass-centering holes. A lower perforated speed to ensure the stability and uniformity of the wall thickness of the rolled hair. When the roll speed adjustment, matching the guide plate is also adjusted accordingly.

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