First, rolling and annealing white fire

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 Improve or eliminate all kinds of structural defects and residual stresses produced in the process of casting, forging, rolling and welding of steel, and 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.

Second, the article

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.

Third, welding.

The most important processes of stainless steel 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. ..

Fourth, bead grinding

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.

V. 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 by the die.

Six, cutting

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.

Seven. revise

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 customers at different levels.

Eight, check

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.