//Stainless Steel Precision Seamless Tube Quality Determination Method

Stainless Steel Precision Seamless Tube Quality Determination Method

Stainless steel precision seamless tubes are generally used in precision instruments or medical devices. They are not only expensive, but are also commonly used in critical equipment and instruments. Therefore, the precision and surface finish requirements of precision stainless steel tubes are extremely high.
Commonly used stainless steel precision seamless pipes are 301 stainless steel, 304 stainless steel, 316 stainless steel, 316L stainless steel, 310S stainless steel.
The method of selecting stainless steel precision seamless pipe:
When selecting stainless steel precision seamless pipe, it can be judged from the packaging of stainless steel precision seamless pipe, the appearance: rough, uniform thickness, and whether the surface is stained.

In the daily mechanical equipment and production process, the application range of the special-shaped steel pipe (shaped pipe) is very wide. Let me introduce you to the production molding method of the special-shaped steel pipe (shaped pipe).
Various methods of forming shaped tubes include:
Cold drawing method, cold rolling method, cold bending method, cross rolling method, extrusion method, pushing method, rolling method, roll drawing method, push rolling method, continuous rolling method, rolling method (spinning or cross rolling method) ), hot rolling method, and joint molding method.

Different product shapes, tolerance requirements, surface requirements, hardness requirements, etc., the production molding methods are different, and various methods have various production processes.
The meaning of the right-angle precision tube and rectangular tube right angle (sharp angle):
Shaped steel tubes, rectangular tubes, square tubes, traditional welded stainless steel square rectangular tubes, usually produced with a Turkish head roller with several square rectangular rolls.
The production is mainly based on flat roll rolling, because the flat roll is a two-roller construction method, there are doubts that the four corners of the square rectangular tube are not uniform and the corner force is not common, resulting in four corners of the square rectangular tube. Not sharp, R = 1.2t, the rectangular ruler is the radius of the fillet, and f is the wall thickness. Although it is in line with the company’s specifications, it is not satisfied with the high quality requirements of the users.

The new plan adopts the first four-roller rolling type of Turkey, because the four-roller structure of the Turkish head is the same, the roll gaps of the four corners are flat, and the corners are in the same condition. When the rolling force is large enough, the corners are plasticized. The deformation causes the metal to fill the corners, and the outer and outer surfaces of the tube form the intersection between the plane and the curved surface, that is, the sharp corner.
Right angle (sharp angle) shaped steel tube, rectangular tube, square tube deformation mechanism is the cross section of the tube blank at the center line of the first four rolls of Turkey. The mechanism of the sharp corner of the rectangular tube is different from the meandering rectangular tube by the meandering angle. Relying on the rolling force of the roll, the pressing force F is generated through the curved arch, so that the corner portion of the steel strip is plastically deformed, so that the shaped steel pipe, the rectangular pipe and the square pipe are filled with the corner portion.
The pressure of the arc-shaped arch is filled diagonally. The four heads of the Turkish head act on the same cross-section of the steel strip on a certain arc surface. Under satisfactory conditions, the corner metal can be plastically deformed by the roll pressure to form a sharp corner.

By | 2018-11-24T00:27:40+00:00 November 24th, 2018|Industry News|0 Comments

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