What is the calculation method for small diameter seamless steel pipe parts?
(1) One-time production process of hot-rolled seamless steel pipe (delta initial inspection process):
Billet piercing and rolling heating preparation and inspection steel pipe sizing (reducing diameter) 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, finishing, cold rolling (pulling) 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 tubes 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 cracks, the tube should be cut with a cutter and the cut length is approximately 1 meter. The slab then enters the annealing process and the acid solution is annealed and pickled. Pay attention to the presence of air bubbles when pickling. If a large number of bubbles appear, the quality of the steel pipe does not meet the corresponding specifications. Cold rolled seamless steel tubes have a shorter appearance than hot rolled seamless steel tubes. The wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe, but the appearance is brighter than 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 the quality inspection of hot-rolled seamless steel pipe, it must be selected by strict technical personnel. After the quality inspection, the surface should be oiled and then subjected to multiple cold drawing tests. After hot rolling, a perforation test must be performed. If the perforation is too large, it should be corrected. After straightening, the flaw detector is sent to the flaw detector for testing. Finally, it is labeled, arranged in a standard format and placed next to the warehouse.
Round billet heating perforation three-roller cross rolling, continuous rolling or kneading stripping sizing (or variable diameter) cooling straightening hydraulic pressure test (or flaw detection) mark storage seamless steel pipe is perforated by steel ingot or solid billet, then heat Rolled and rolled. LD rolling or cold drawing. Point out the standard outer 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. 0.25 mm, cold-rolled seamless steel tubes have higher dimensional accuracy than hot-rolled steel tubes.
Seamless steel tubes are generally hot rolled or cold rolled with high quality carbon steel such as 16Mn, 5MNv or low alloy structural steels 40Cr, 30CrMnSi, 45Mn2, 40MnB.
45, 40Cr and other medium carbon steel seamless pipes are used to manufacture mechanical parts such as automobiles and tractors. In general, seamless steel tubes should be used for 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 continuous rolling, I hope the significance of this article is that the rolling stock under high temperature, so the deformation resistance is small, and can achieve large deformation. Taking thin steel sheet rolling as an example, through rough rolling and finish rolling, the thickness of the continuous casting blank is about 230 mm, and the final thickness is 1 to 20 mm.