What is the production process of stainless steel pipe?

The whole process of stainless steel pipe production;

1. Calendering and annealing

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.

Extended data:

Hardness testing of stainless steel pipe;

W-B75 Wechsler Hardness Tester can be used for annealed stainless steel pipes with inner diameter greater than 6.0mm and wall thickness less than13 mm. The test is very fast and simple, and it is suitable for rapid nondestructive qualification inspection of stainless steel pipes. The HRB hardness and HRC hardness of stainless steel pipes with inner diameter greater than 30mm and wall thickness greater than 65438±0.2mm were measured by Rockwell hardness tester.

For stainless steel pipes with inner diameter greater than 30mm and wall thickness less than 65438±0.2mm, the hardness of HRT or HRN is measured by surface Rockwell hardness tester. For stainless steel pipes with inner diameter less than 0mm and greater than 4.8mm, the hardness of HR 15T was tested by Rockwell hardness tester. When the inner diameter of stainless steel pipe is greater than 26 mm, the hardness of the inner wall of the pipe can also be detected by Rockwell or Surface Rockwell Hardness Tester.

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