(1) Primary production process of hot rolled seamless steel pipe (delta initial inspection process):
Billet piercing and rolling heating preparation and inspection steel pipe sizing (reduction) heat treatment straightening finished pipe finishing inspection library
(2) The main production processes of cold-rolled (drawn) seamless steel pipes are as follows:
Billet preparation pickling smoothing cold rolling (drawing) heat treatment straightening finishing inspection
The production process of seamless steel tubes can be generally divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipes is generally more confusing than hot rolling. First, the blank must be continuously rolled three rolls. After kneading, a calibration test should be performed. If the appearance does not respond to the crack, the round tube should be cut by a cutter and the cutting growth is about 1 meter. The billet then enters the annealing process, and the acid solution is annealed and pickled. When pickling, attention should be paid to whether many bubbles appear. If many bubbles appear, it indicates that the quality of the steel tube cannot meet the corresponding specifications. Cold rolled seamless steel tubes have a shorter appearance than hot rolled seamless steel tubes. The wall thickness of the cold-rolled seamless steel pipe is generally smaller than that of the hot-rolled seamless steel pipe, but the appearance is brighter than the thick-walled seamless steel pipe. The appearance is not too rough and the caliber is not too big.
The conveying state of the hot-rolled seamless steel pipe is usually conveyed after hot rolling and heat treatment. After passing the quality inspection, the hot-rolled seamless steel pipe must be selected by a strict technician. After quality inspection, the surface should be oiled and then subjected to multiple cold drawing tests. After hot rolling, it is necessary to perform a perforation experiment. If the perforation is too large, it should be corrected. After straightening, it is sent to the flaw detector through the conveyor for flaw detection experiments. Finally, it is labeled, arranged in a standard format, and placed next to the warehouse.
Round billet heating perforation three-roll cross-rolling, continuous rolling or kneading stripping sizing (or reducing diameter) cooling straightening hydrostatic test (or flaw detection) symbol storage seamless steel pipe is made of steel ingot or solid billet through perforation, then hot Rolled and rolled. LD rolling or cold drawing. Point out the standard outside diameter of the seamless steel pipe * wall thickness mm.
The outer diameter of hot-rolled seamless steel pipe is generally larger than 32mm, the wall thickness is 2.5-200mm, the outer diameter of cold-rolled seamless steel pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled steel pipe can reach 5mm, and the wall thickness is less than 6mm. 0.25mm, cold rolled seamless steel pipe has higher dimensional accuracy than hot rolled steel pipe.
The seamless steel pipe is generally hot-rolled or cold-rolled using high-quality carbon bonded steel 16Mn, 5MnV or low-alloy structural steel 40Cr, 30CrMnSi, 45Mn2, 40MnB, and the like.
Seamless pipes made of medium carbon steel such as 45 and 40Cr are used to make mechanical parts such as stress parts for automobiles and tractors. In general, seamless steel tubes should be used to ensure strength and flattening tests. The hot rolled steel pipe is conveyed under hot rolling or heat treatment conditions, and the cold rolled steel pipe is conveyed under heat treatment conditions.
Hot rolling, I hope the meaning of the text, the high temperature of the rolling stock, so the deformation resistance is small, and large deformation can be achieved. Taking steel sheet rolling as an example, the thickness of the continuous casting slab is about 230 mm by rough rolling and finish rolling, and the final thickness is 1 to 20 mm.
Cangzhou Steel Pipe Group (CSPG)Co.,Ltd.
No.92 JieFang East Road ,Cangzhou City, Hebei,P.R.China.
CSPG has more than eighteen years history company which located in Lecong Iron and Steel World, a well-known steel distribution center in China, with superior geographical position and convenient water and land transportation.
We are a direct-selling manufacturer specializing in the research and development of spiral steel pipes, steel spiral pipes, anti-corrosion steel pipes inside and outside. Since its inception, the company has been guided by a brand-new thinking of steel pipe product market based on the business philosophy of honesty, pragmatism and knowledge-seeking.