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Stainless steel square tube definition

A square tube of stainless steel is a long hollow piece of steel, called a square because of its square section. A large number of pipelines used for conveying fluid, such as oil, natural gas, water, gas, steam, etc., in addition, bending, torsional strength at the same time, the weight is relatively light,

so it is also widely used in the manufacture of mechanical parts and engineering structures.

Stainless steel square pipe classification: square pipe divided seamless pipe and welded pipe (welded pipe) two categories. By section shape can be divided into square and rectangular tube, widely used is circular steel tube, but there are some semicircle, hexagon, equilateral triangle, octagonal

shaped shaped steel tube.

To bear the fluid pressure of the stainless steel square pipe to carry out hydraulic test to check its pressure capacity and quality, in the specified pressure does not leak, soaking or expansion is qualified, some steel pipe also according to the standard or requirements of the buyer for rolling edge

test, flaring test, flattening test.

Specification: 5*5~150*150 mm thickness :0.4~6.0 mm

Material of square pipe: 304, 304L, TP304, TP316L, 316, 316L, 316Ti, 321, 347H, 310S

The production process

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A. Round steel preparation; B. Heating; C. Hot rolling perforation; D. Cutting head; E. Pickling. F. Grinding; G. Lubrication; H. Cold rolling; I. Degreasing; J. Solid solution heat treatment; K. Straightening; L. Pipe cutting; M. Pickling. N. Inspection of finished products.

Performance analysis

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The metal can react with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on the ordinary carbon steel will continue to oxidize, making the rust continuously expand and finally form holes. It is possible to protect the surface of carbon steel by electroplating it

with paint or a metal resistant to oxidation. Whether the stainless steel tube is corroded is related to the content of chromium in the steel, when the content of chromium in the steel reaches 12%, in the atmosphere, the surface of the stainless steel tube generated a layer of passivation, dense rich

chromium oxide and protect the surface, can prevent further oxidation. This oxide layer is extremely thin, through which the natural luster of the steel surface can be seen, giving stainless steel a unique surface. If the chromium film is destroyed, the chromium in the steel and oxygen in the

atmosphere regenerated passivation film, continue to play a protective role. In some special circumstances, stainless steel will also appear some local corrosion and failure, but stainless steel and carbon steel different, will not appear uniform corrosion and failure, so corrosion allowance for

stainless steel tube is not meaningful.

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