Hot Rolled Square and Rectangular Pipes

Steel profile pipes: types and their characteristics

Profile pipes are atypical steel rolled products, which are characterized by a square or rectangular (less often oval) cross-section. Profile pipes are used in almost all industrial sectors - from construction to furniture production.

Depending on the cross-sectional shape, profile pipes are divided into two large categories:

• rectangular shaped pipes - perfect as a load-bearing element where the load vector is precisely known;
• square shaped tubes - perfect as a load-bearing element for steel structures with lateral loads.

For the manufacture of a profile pipe of square or rectangular cross-section, carbon steel grades are used that are characterized by high physical and mechanical properties, for example, S235JR / 1.0038, S275J2 / 1.0145, S355J0 / 1.0553, S355J2 / 1.0577, S355NL / 1.0546, S355ML / 1.8834, S00355JR / 1. , S275J0 / 1.0143, S275NL / 1.0491, S275ML / 1.8819 etc.

The production of shaped pipes is carried out using several technologies, as a result of which the following finished metal products are obtained:

• Seamless shaped pipes are metal products that are obtained by hot forming a steel billet, which is a seamless pipe. Depending on which seamless pipe was used as a workpiece, shaped products can be divided into cold-rolled and hot-rolled seamless shaped pipes. Seamless profile pipes are characterized by increased tightness and strength due to the absence of a welded seam. Recommend seamless shaped pipes for use in difficult working conditions with high internal pressure and high / low temperature of the transported medium;
• welded shaped pipes are metal products that require a blank (strip or sheet steel) to be manufactured. The workpiece is alternately driven through the cutting and welding line, obtaining a steel strip of the required width. Then this tape is placed in a special drum and passed through the rollers, which form the required profile (rectangular or square). The joint of the edges of the workpiece is welded with a straight or spiral seam. Welded shaped tubes can be calibrated. Calibrated shaped tubes are characterized by well-defined dimensional tolerances and a specified maximum surface roughness.

Tolerances, materials, markings, delivery conditions, production methods, as well as the dimensions of shaped pipes are regulated by the following standards:

• EN 10210 - Hot rolled pipes of unalloyed and fine-grained structural steels;
• EN 10225 - Profiled steel pipes for offshore structures;
• EN 10219 - Cold-rolled section tubes of unalloyed and fine-grained structural steels;
• EN 10305-5 - Welded calibrated shaped tubes.

The dimensions of the profile pipes are set as follows:

• pipe width - from 15 to 600 mm;
• pipe height - from 10 to 500 mm;
• wall thickness - from 1 to 25 mm.

Like any pipe metal rolling, steel profile seamless and welded pipes undergo a number of tests:

• hydrotesting;
• control of geometric parameters;
• impact bending, tensile tests;
• surface quality control.

Also, square or rectangular pipes pass through a mandatory visual inspection for cracks, burrs, bends, etc. If any defects are found, they are immediately subjected to mechanical treatment.
The welded seam also undergoes mandatory control by means of an X-ray examination.

Properties and Applications of Steel Profile Pipes

Steel grades that are used as raw materials for the production of square or rectangular pipes in accordance with regulatory standards are characterized by high performance properties. So, these steels lend themselves well to welding, while they do not require preheating of the flange section and do not need heat treatment after welding. They have high strength and hardness, as well as high resistance to cracking and have a low cold brittleness threshold.

Steel shaped pipes are characterized by such technical properties as:

• high structural strength;
• the reliability of the welded seam;
• light weight;
• good weldability;
• affordable cost;
• resistance to deformations and loads;
• long service life

The main industrial consumers of shaped pipes are:

• civil and industrial construction;
• light and heavy industry;
• mechanical engineering and machine tool building;
• housing and agricultural sector;
• bridge building and organization of offshore structures;
• furniture manufacturing;
• manufacturing of stairs, frames, supports, etc.

Where to buy a profile pipe
You can order and buy a square or rectangular profile pipe in our company by calling the indicated numbers or filling out the online application form. We supply high-quality European ferrous steel products directly to the CIS countries. The quality and compliance of each delivered item of rolled metal with the requirements of regulatory standards is confirmed by a complete package of documentation.