Shandong Weichuan Metal Prodducts Co., Ltd.

Quality assurance of large alloy square tube factory

Short Description:

Seamless square pipe is a square steel pipe with four corners. It is a square steel pipe formed by cold drawing and extrusion of seamless steel pipe. There is an essential difference between seamless square pipe and welded square pipe. Steel pipe has hollow section and is widely used as a pipeline for conveying fluid.

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Difference between steel pipe and solid steel

Compared with solid steel such as round steel, steel pipe is generally light in weight when its bending and torsional strength is the same. It is an economic section steel. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffold used in construction. Manufacturing ring parts with steel pipes can improve material utilization, simplify manufacturing processes, and save materials and processing hours, such as rolling bearing rings, Jack sleeves, etc. In 2013, it was made of steel pipe. Steel pipe is also an indispensable material for all kinds of conventional weapons and military machinery. Gun barrel and barrel should be made of steel pipe. Steel pipe can be divided into round pipe and special-shaped pipe according to different cross-sectional area and shape. Because under the condition of equal circumference, more fluid can be transported with circular pipe. When the ring section bears the internal or external radial pressure, the force is more uniform, and most of the steel pipes are round pipes.

1. Welded square pipe is a kind of hollow square section steel square pipe, also known as hollow cold-formed section steel. It is a section steel with square section shape and size made of hot-rolled or cold-rolled strip or coil plate after cold bending and high-frequency welding.

In addition to the thickening of wall thickness, the corner size and edge flatness of thick wall square pipe reach or even exceed the level of resistance welding cold-formed square pipe. The size of R corner is generally between 2-3 times of wall thickness. R corner square pipe of the size required by customers can also be produced according to the needs of customers;

2. Square tube seamless square tube is a kind of long steel with hollow section and no joints around. It is a square tube formed by extrusion of seamless tube through four sides of the die. Square tube has hollow section and is widely used in liquid transportation, hydraulic support, mechanical structure, medium and low pressure, high pressure boiler tube, heat exchange tube, gas, petroleum and other industries. It is stronger than welded and will not crack.

Process flow of sanitary mirror tube

Pipe blank - Inspection - peeling - Inspection - heating - perforation - Pickling - grinding - Lubrication and air drying - welding head - cold drawing - solid solution treatment - Pickling - pickling and passivation - Inspection - cold rolling - degreasing - head cutting - air drying - internal polishing - External polishing - Inspection - Identification - finished product packaging.

Industrial pipe process flow

Pipe blank - Inspection - peeling - Inspection - heating - perforation - Pickling - grinding - Lubrication and air drying - welding head - cold drawing - solid solution treatment - Pickling - pickling passivation - Inspection

Welded pipe process flow

Uncoiling - leveling - end shearing and welding - looper - forming - Welding - internal and external weld bead removal - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - final inspection - packaging

Process flow of seamless square pipe

Round steel - tube blank - Inspection - heating - perforation - sizing - hot rolling - flat head - Inspection - Pickling - spherical annealing - cold drawing - forming - joint alignment - Inspection

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