Stainless steel pickling passivation can simultaneously remove oil stains, rust spots, solder joints, oxide layers, free iron and other dirt on the surface of the workpiece, and the treated surface becomes uniform silvery white; At the same time, efficient corrosion inhibitor and fog inhibitor are added to prevent excessive corrosion and hydrogen embrittlement of metals and inhibit the generation of acid fog.

take exercise

A metal heat treatment process in which the workpiece is heated to a predetermined temperature, kept for a certain time, and then slowly cooled. The purpose of annealing is: ① to improve or eliminate all kinds of structural defects and residual stresses produced in the process of casting, forging, rolling and welding of steel, and to prevent deformation and cracking of workpieces. ② Soften the workpiece for cutting. ③ Refine the grain, improve the structure and improve the mechanical properties of the workpiece. ④ Prepare for final heat treatment and pipe making.

List in detail

Cutting stainless steel coil is to cut stainless steel coil into corresponding width for further deep processing and pipe making. In the process of cutting, we should pay attention to the scratch of the coil by the cutting knife, the width and error of cutting, and the cutting is related to the pipe-making process, and the cloak and burr of cutting are very important to the pipe-making process.

weld

The most important processes of stainless steel welded pipe are argon arc welding and plasma welding. The shielding gas of argon arc welding is pure argon, mainly welding stainless steel pipes below 3mm, and plasma welding has strong penetration, mainly welding stainless steel pipes of 5-8 mm. ..

Weld polishing

In the process of welding stainless steel pipe, it is necessary to polish and water cool the outer weld. After water cooling, directly grind the weld with a water mill until it is flat. Generally, according to the thickness of stainless steel pipe, 3-5 groups of water mills are added to polish and trim the weld.

Do plastic surgery

The production process of stainless steel welded pipe is called extrusion production. All square pipes and rectangular pipes were originally round pipes. By producing round tubes with the same circumference, they are extruded into corresponding square tubes and rectangular tubes, and finally straightened with dies.

incision

The manufacturing and cutting process of stainless steel pipes is relatively rough, and most of them are cut with grinding wheels. Cloak will be produced after cutting, which needs further pruning. In addition, band saw cutting is more accurate, and cloak heat treatment is also available. For special purpose pipes, bright heat treatment is needed to make the ductility of pipes reach a higher level.

correct

The roundness and symmetry of individual produced pipes are slightly poor, so it needs to be extruded again with a die to make it symmetrical.

straightening

The common fault of stainless steel welded pipe is pipe bending. There are many reasons for this phenomenon, and the basic treatment is to correct it again.

Trim the end

Due to the lack of cutting technology, there are many burrs on the stainless steel nozzle, so it is necessary to finish the bottle mouth with a flat mouth machine and correct the port with a corneal machine.

Suitable for pickling

For industrial and mechanical pipelines, another pickling process is needed to passivate the surface and form a new protective film.

shine

There are several surface treatments for product pipes and decorative pipes, including grinding, which are divided into 400#, 600# and 800#, while drawing sand is divided into round sand and straight sand, which are 180#, 240#, 400#, 600# and 800# respectively, which are suitable for different levels of customer needs.

test

Inspection, mainly to check whether the pipe diameter and thickness meet the standards, whether the surface treatment meets the standards and whether the welding process meets the standards.

parcel

At present, the most common packaging of stainless steel pipes is plastic bags. For those with strict surface requirements, sponge packaging, bubble bag packaging, woven bag packaging and other packaging technologies can be selected.