Liaocheng Grenada large-diameter seamless steel pipe production process mainly large diameter seamless steel hot rolled and hot expanded diameter seamless steel pipe, thermal expansion seamless maximum size of 325mm * 1220mm hotline thickest 120mm, thermal expansion seamless steel pipe to produce non-national standard size, thermal expansion seamless tube is what we often say that thermal expansion tubes, density is relatively low but strong steel pipes shrink Cross-rolling method or drawing method to expand a blank pipe finishing process pipe diameter. In a short period of time for the steel thickening to produce non-standard and special types of seamless tube, and low cost, large diameter seamless pipe cutting, high production efficiency, it is the development trend of the current international rolling fields. The provisions of the GB5310 outside diameter greater than or equal to 76mm, and wall thickness of pipe ≥14mm should Charpy V-longitudinal impact test at 20 ℃; the average impact energy of three specimens shall not be less than 40J, large diameter seamless pipe retail, allowing a sample impact energy below average, but not less than 70% of the average. Large-diameter seamless steel pipe diameter> 219.1mm, and the wall thickness of the pipe is available ≥25mm lateral mechanical testing instead of longitudinal mechanical test. Xia conducted at 20 ℃ than V-type lateral impact test, large-diameter pipe transversely mechanical testing to convenience. Grenada Liaocheng seamless steel pipe plant production methods are roughly divided into oblique rolling method (Mengneisiman Law) and extrusion. The former method is to use oblique roll the tube perforation bad, then rolling it extends. This method of production faster, but higher on the tube workability requirements, mainly for the production of carbon steel and low-alloy steel pipe. After the rule is to punch perforation tube or ingot, and then into a pipe extruder, this method is lower than the oblique padding efficiency, suitable for the production of high strength steel tube. Cross-rolling method and extrusion billet or ingot must first heating, production of steel pipe called hot-rolled tubes. Produced by thermal processing of steel can sometimes be cold again as needed. Cold, there are two ways: one is cold-drawing method is to pipe through extubation die drawing, Yanbian large diameter seamless pipe, steel pipe tapering, elongate; Another method is cold rolling, it is Mengneisiman brothers invented the hot-rolling mill cold method applied. Cold seamless steel pipe, steel pipe can be improved dimensional accuracy and finish machining, large diameter seamless pipe prices, improved mechanical properties of materials. I plant Tips: purchase refrain freeloaders really seamless, seamless pipe market was mixed at present, remember a sub-price goods! Cheap no good pipe! Good controls are not cheap (^ o ^) did not say the lowest price, the lowest ratio dare Yanbian large diameter seamless |! Large diameter seamless pipe plant | large diameter seamless wholesale by Pipe Co., Ltd. Shandong Liaocheng Grenada. Yanbian large diameter seamless | large diameter seamless pipe plant | large diameter seamless wholesale Shandong Liaocheng Grenada Pipe Co., Ltd. (www.grqmgc.com) (www.grwfggc.com) this year introduced a new upgrade, more Picture for reference only, please call Tel picture on this page or to obtain the latest information, Contact: Deng Jingli.