Precision Welded Pipe Processing Technology and Manufacturing Process Steps

01 Jul,2020

Precision Welded Pipe Processing Technology and Manufacturing Process Steps

Common Precision welded pipe The manufacturing process can be divided into two types: cold drawing and hot rolling. The production of cold‑rolled precision tubes is generally more complex than that of hot‑rolled tubes. During testing, if the surface shows no signs of cracking, the round tube is cut with a cutting machine into blanks approximately one meter in length, after which it proceeds to the annealing stage. Annealing should be carried out using an acidic pickling solution; during pickling, attention must be paid to whether bubbling occurs on the surface. Excessive bubbling indicates that the steel pipe does not meet the required quality standards. The appearance of cold‑rolled precision tubes is typically less uniform than that of hot‑rolled precision tubes. Cold‑rolled… Precision welded pipe Its wall thickness is typically thinner than that of hot-rolled precision tubing, yet its surface appears thicker. Precision welded pipe It must be bright. The surface should have minimal roughness and diameter variation, with few defects. The delivery condition of hot‑rolled precision tubes is typically as‑rolled after heat treatment. Following quality inspection, operators rigorously select the hot‑rolled material by hand. Precision welded pipe After quality inspection, the surface is oiled, followed by multiple cold-drawing tests, and then a piercing test after hot-rolling. If the piercing diameter is too large, straightening is required. Once straightened, the material is conveyed to an ultrasonic flaw detector for nondestructive testing. Finally, labels are affixed, dimensions are sorted, and the product is stored in the warehouse.

Precision welded pipe

Hot rolling of round tube billets → heating → piercing → three-roll cross‑rolling, continuous rolling or extrusion → tube removal → sizing (or diameter reduction) → cooling → straightening → hydrostatic testing (or nondestructive inspection) → marking → storage. Precision tubes are produced by piercing steel ingots or solid tube billets, followed by hot rolling, cold rolling, or cold drawing. Precision welded pipe of the outer diameter * Wall thickness (mm) is indicated. Precision welded pipe They are classified into hot-rolled and cold-rolled precision tubes.

Hot rolling Precision welded pipe They are classified into ordinary steel pipes, medium- and low-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes, and other types of steel pipes. Cold‑rolled (turntable) precision tubes are divided into ordinary steel pipes, medium- and low-pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipe categories; they also include carbon steel thin‑walled pipes, alloy thin‑walled pipes, rust‑resistant thin‑walled pipes, and special‑shaped steel pipes. The outer diameter of hot‑rolled seamless pipes is typically greater than… 32mm , with a wall thickness of 2.5-200mm , cold rolling Precision welded pipe The diameter can be 6mm , the wall thickness can be 0.25mm , thin-walled tubes can be 5mm , wall thickness less than 0.25mm It offers higher dimensional accuracy than hot-rolled steel.

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