For what purpose are controlled by the dimensions of profile pipes and from which they depend

Hot shaped tubes

Monitoring the dimensional characteristics of shaped pipes are extremely important because they are used for the construction of steel structures, and any deviation from the rules can affect the strength of the building or structure.Custom tube may behave unpredictably - to weaken the structure or in the best case, to increase the estimated mass of the structure.Designers in the design of steel structures based on the normative dimensions inherent in the guest on the profile tubes.If the dimensional characteristics of the same will not be, all the design calculations will be wrong and fatal error can be tolerated.Therefore, the size and cause them control over the very existence of metal.

The dimensions of the pipe, ie,its height, width, radius of curvature, wall thickness, etc. depend on the method of production of these products.Industrial metallurgical production uses only three processes that are used for the manufacture of tubular profile steel.

1. hot deformation of a conventional round tube.
2. cold deformation of a circular tube, followed by heating the metal to relieve stress.
3. Profile Forming sheet metal with a welding seam.Method

process affects the wall thickness of the calibration method, for other dimensional characteristics.

According to GOST output of production have a tube with a square cross-section, the dimensions of which must not exceed 60 mm.If a pipe with a rectangular cross section, its height must correspond to 60 mm.Range GOST 8645-68 for rectangular tubes defines up to two dozen sizes.A similar amount is also contained in GOST 8639-82 pipe with a square cross-section.For one and other standard model sectional dimensions will vary between 60x60 up to 230h100 mm.

Next GOST 8639-82 specifies what should be the thickness of the walls of profile pipes.The minimum thickness of 4 mm, maximum 14 mm.Dimensional segment length - is also a parameter specified in the standards, and it does not depend on whether the final product is supposed to be.The minimum interval is 4 meters and a maximum length of 12.5 m.

Cold pipe

The output of finished cold rolled shaped tubes are more subtle characteristics than that of a hot option.The dimensional characteristics - the wall section, the thickness is much smaller.According to the guests at the tubes cold rolled section equal to the brink of not less than 10 mm and not more than 120 mm, ie from 10x10 to 120x120 mm.GOST 8639-82 is 17 sizes to meet these requirements, and GOST 8645-68 has 16 sizes.Cold pipes can have a wall thickness of 1 mm and up to 8 mm.Therefore, the conclusion is that if you want the product without connecting seam and with thin walls, it is necessary to purchase cold-profile.Length dimensional segments ranges from 4.5 m to 11 m. Off-gauge lengths can be at least 1.5 m and a maximum of 9m.

welded profile pipes

physical characteristics of the products made by this technology, do not differ from seamless counterparts, except that the weld can weaken the pipe stiffness by 5-10%.These products can be manufactured with walls 1-5 mm thick, and at the same time with the impressive dimensions of 10x10 to 100x100.The length can be dimensional and unmeasured.Measuring are from 5 to 9m, off-gage from 1.5 to 9 m.

welding method can be obtained not only square products, but also oval and round.Dimensions of welded profile pipes are determined by GOST 8642-68.According to this oval cross section equal to 90h32 16h10 mm mm with a wall thickness of not more than 2.5 mm and not less than 1 mm.