Stainless steel tubes - harmony of power and beauty

The popularity of stainless steel pipes is justifiably deserved. The areas of application of these products are so varied that it is necessary to choose the appropriate parameters. GOST on stainless steel pipes can be the right guide in this matter.

Wear resistance, fantastic resistance to adverse environmental conditions and aggressive substances, coupled with resistance to mechanical loads, makes such pipes almost unique.

Each pipe has its own place

Corrosion-resistant pipes are used for internal and external pipelines, erection of monumental and light structures, in the design of design projects. In accordance with the future loads that the structure will assume, the appropriate working material is selected.

The range of stainless steel pipes contains basic information on all types of rolled products (profile pipe, with a circular cross section). In the case of rolled sections, cross-sectional views are diverse, it can be multi-faceted, square, rectangular, segment, etc.

The shape of the section and operation depend on the nature of the intended loads. If the pipeline transporting liquids has a usual circular section, then for the supporting elements of the framework the best option is a square or rectangular section.

Surface types

Surfaces made of stainless steel t differ from each other in appearance due to finishing with abrasives or during an electrochemical reaction. The output is smooth or rough, matte or mirror, which will be either a hidden part of the supporting structure or a turnstile.

Types of pipe rolled

The technological process of producing seamless pipes involves two options.

1. Hot hire - includes 2 basic operations: heating a round billet to plasticity and processing it on a piercing mill. The resulting hollow sleeve is crimped, stretched, rolled. Finished products in accordance with the wall thickness are cut according to GOST 9940 81 into fragments from 300 mm of the minimum multiple length to 1.5–10 m of unmeasured length.

1. Cold and warm hire performed by a similar technology. Only after flashing the product is cooled with water. The minimum length is limited to 300 mm, the maximum - 12.5 m, the dimension can be clarified according to GOST 9941 81, depending on the wall thickness

For the manufacture of pipelines used sheet blanks. They are cut and rolled in the forming mill, changing the shape of the section from round to square / rectangular. In parallel with this, weld seam welding takes place.

Specifications - business card stainless steel pipes

In general, GOST 9941 81 and 9940 81 are in solidarity, making the main demands on the assortment of a round pipeline in questions.

According to GOST 9941 81 the following requirements for cold and warm rolled products should be observed:

• maximum deviations in outer diameter - from 0.3 mm to 1%;
• wall thickness deviation - from 0.05 mm to 10%;
• pipe curvature on the 1-meter section - 1–2 mm;

• the use of steel grade and the quality of the finished product depending on this.

According to GOST 9940 81 seamless hot rolled. The outer diameter of such a pipeline varies in the range of 57 - 325 mm.

Tolerances differ depending on the thickness of the metal. For example, with a wall thickness of 8–20 mm, the maximum deviation is ± 15%.

The quality of the weld and defects are carried out in accordance with GOST 11068-81. The main technical requirements for the rolled products are determined by GOST 8639-82 - deviation from the right angle (± 1.5 °), curvature (up to 2 mm per 1 m), twisting.

Note! If you need to know the theoretical weight of the pipeline, but there is no GOST, you can use a simple formula - weight 1 p / m = D * t * 0.025 kg, where D is the external diameter (mm), t is the wall thickness (mm).

Types and methods of mounting systems of stainless pipes

The range of products made of corrosion-resistant steel allows you to create structures for various utilitarian purposes. Installation of stainless steel pipes with a circular cross section is perfect for systems that transport liquids and gases without reacting with them.

Profile pipes, on the contrary, are most relevant in architectural structures, as supports, fences, etc. Stiffeners make it possible to withstand torsional, mechanical, and vibration loads.

Installation of round tubes

Pipeline systems of stainless steel products are in demand in the food, chemical and medical industries. A stable surface does not change the taste of food and is not destroyed by exposure to poisonous liquids. Installation of stainless steel pipelines depends on the conditions of its operation.

Permanent connections

The instruction for this type of pipeline docking looks simple - you just need to connect the pipes and weld / braze / glue them.

I distinguish these types of permanent connections:

• welding (butt and to the socket) is made by argon-arc welding, the seams are cleaned with acid or abrasives;
• soldering (hard and soft);
• bonding (anaerobic, cyanoacrylate adhesives).

Split connectors

The most convenient way to connect, this type of joint can easily be made by hand:

• collet;
• threaded;
• coupling;
• crimping;
• choke.

Diopter - a look into the essence

In the food industry, it is customary to equip pipelines with diopters (glass windows) - devices that allow to observe what is happening in the pipeline itself. These devices most often need dairy and confectionery enterprises.

The stainless steel pipe diopter is represented by two models - pipe and nut (double porthole), each of which has its own advantages.

1. At pipe viewing angle of 360 °, quick-detachable Clamp-connection sight glass.

1. The wrench has a backlighting of the internal space, the glass withstands a temperature drop from 230 ° to 20 ° C for a minute. Connection method welding.

Structures from profile pipelines

The installation of pipes of stainless steel of rectangular and square sections is used in the erection of various types of metal structures - supermarket framework, foundation skeleton, supports. The determining factor here will be the thickness of the walls of the profile.

A lighter pipeline is best suited for sheds, railings, billboards, furniture frames and decorative elements. Connection methods also range from welding and bonding to fittings.

In conclusion

Resisting aggressive chemical attack, mechanical strength and presentable appearance are the three whales that underpin the popularity of stainless steel rolled stock. The main pipeline or conduit in the apartment, the supporting structure or a piece of furniture - the price recedes into the background when it comes to durability and safety.

The video in this article describes the process of production of stainless steel pipes.