Alexandria steel square, key, square calibrated st20, st45, 40X, 30HGSA (Metallobaza)

Alexandria steel square, key, square calibrated st20, st45, 40X, 30HGSA (Metallobaza)

Steel square, manufactured in accordance with GOSTs, is one of the popular products of rolled metal products. Differs in square section, let out it in the form of a bar or a wire. In everyday life, it is often called square rolled.
The product is most actively used in construction and industry. Its assortment is wide due to the needs indicated by the consumer.
Manufacturing methods and GOSTs
They produce square products by hot and cold rolling methods in accordance with GOSTs. So:

     GOST 2591 88 - hot-rolled steel square;
     GOST 1133-71 - forged steel square;
     GOST 8559-75 - calibrated steel square.

Still, the steel version of the products is more popular: the consumer is impressed by strength, resistance to deformation, and wear. A steel square (GOST 2591 88) made of stainless steel, for example, is indispensable as a basic element of supporting structures that operate in aggressive environments at high temperatures.
Steel square is widely classified:

     According to the manufacturing method (squares hot-rolled or cold-rolled). Calibration is often used - a process in which a hot-rolled steel billet is compressed to specified dimensions.
     By lenght. It can be dimensional, a multiple of dimensional, non-dimensional.
     By length and variety of raw materials. For products 1-6 m long, high-alloy steel is used, 2-6 m - high-quality alloy or carbon steel, and for a square 2-12 m long - low-alloy, carbon steel of ordinary quality.
     According to the surface condition and the accuracy of the cross-sectional dimensions, steel squares can be of high and ordinary accuracy, while having curvature deviations acceptable by GOSTs.

The metal square is also classified depending on the raw materials used, which helps buyers navigate the choice and purchase a product with the desired performance characteristics.
Hot-rolled square st3 is made of steel 3 by hot rolling. Raw materials are usually used for the production of non-critical structures, simple parts, spare parts (in mechanical engineering), various connecting elements. The product is a blank for forged elements, "participates" in the installation of various barriers, gratings.
Hot-rolled steel square 09g2s is distinguished by good weldability and, at the same time, strength, which makes it indispensable in construction and mechanical engineering. Get it using the method of hot rolling. The raw material is structural low-alloy steel.
Square hot-smoked steel 20 is a product of increased strength and wear resistance, “ready to endure” operating conditions at high temperatures. Many construction companies, machine-building plants buy this square. Rolled metal produced from high-quality steel grades using the hot rolling method is also in demand in aircraft and shipbuilding.
Square st 45 is distinguished by a peculiar section of the cut. For its manufacture (by hot rolling), high-quality structural steel grade 45 is required, which usually serves to obtain products with an increased level of strength subjected to thermal hardening.
The scope of these well-welded products, resistant to various deformations and wear, is no less wide.
Calibrated square is a rolled metal product made by the cold-drawn method. It is necessary where exact dimensions and a smooth, even surface are needed. This is the production of blanks, and urban planning, and the production of transport, and interior design.
Characteristic:

The calibrated square differs in standard sizes, length of whips, steel grade, delivery status, surface quality groups.
In accordance with the State Standard, a calibrated square is manufactured with side sizes from 3 to 100 mm.
By agreement between the manufacturer and the consumer, calibrated steel can be produced in intermediate sizes not specified in GOST 8559-75.
The length of the square calibrated from 2 to 6 m and can correspond to the lengths:

     md (measured length);
     nd (random length);
     cd (multiple measured length).

The remainder is considered a whip from 1.5 to 2 meters.
By agreement of the parties, the calibrated square can be supplied in coils (bays).
As a rule, a calibrated steel square is made from high-quality structural steel grades: art. 10; art.20; Art. 35; Art. 45 and others.
Rolled square calibrated is supplied:

     T - in a heat-treated state (annealed, hardened, etc.);
     H - in the hardened state.

Surface quality groups:

     A - the highest quality of the surface;
     B - small defects, residues of scale, traces of cleaning are allowed on the surface;
     B is the average depth of defects;
     G - group with the greatest depth of defects.

Defects can be removed from the surface by grinding.
Application:

Due to the increased dimensional accuracy and surface quality, calibrated steel (calibration) is widely used in mechanical engineering for the manufacture of machine parts and spare parts.astey.
Sectioned calibrated steel differs from ordinary hot-rolled steel in higher accuracy and surface quality of bars, which makes it in demand for use in cold heading equipment and automatic machines, due to a significant reduction in metal consumption during its further processing.
A calibrated square is used as a blank for the production of products with high requirements for accuracy and surface quality, for example, such machine parts as axles, shafts, spindles, bushings, pushers, plungers.
  Stainless steel square calibrated as hot rolled, has such characteristics as heat resistance, non-magnetic, corrosion resistance and looks quite attractive. There are several ways to classify this item. but the main one is the method of manufacture.
In production, a stainless steel square can be obtained in two ways:

• hot-rolled squares are produced in accordance with GOST 2591-88. An indicator of the thickness of this product is the size of the side and it can reach 6-20 mm;
• cold-formed or calibrated squares. Their production is regulated by GOST 8559-75. The side of such a square can be 3-100 mm, and the length is from 2 to 6 m.

In this case, the following parameters are important for calibrated squares:

• rolling accuracy. They produce squares of ordinary (grade B) and increased accuracy (grade B);
• release form. The product is supplied by manufacturers in the form of coils, with a sheet thickness of up to 3-5 mm, and in the form of bars, with a thickness of 5-10 mm;
• method of surface treatment. There are squares hardened and heat-treated.

Manufacturers offer squares calibrated measured length, multiple measured, measured and multiple measured length with a remainder of 15%, unmeasured length. According to the requirements of GOST, the difference in the diagonals of wire rod in one section should be no more than twice the sum of the maximum deviations on the side of the product. The curvature of the steel bars of a calibrated stainless steel square cannot exceed 0.2% of the product length. The curvature index is measured over a length of 1 m, while the distance from the ends must be at least 150 mm. For the manufacture of a calibrated square, ordinary and structural steels of different grades are used. This significantly expands the scope of the product, so they are widely used both in everyday life and in the field of heavy engineering.
Application of steel calibrated square

Stainless steel, which is the basis for this product, has unique characteristics, thanks to which the product can be used in a variety of fields. The calibrated steel square has a regular geometric shape and is resistant to twisting, which, in fact, predetermines the scope of its application:

• machine and aircraft building;

Due to its unique properties, the square has become widespread and used in various fields. The calibrated square, in contrast to the usual one, is made with increased accuracy of rolled products, which makes it possible to use it in the production of dowels and other products, where increased accuracy is of particular importance. It is used as a blank for further processing of shaped and long products and for the production of automotive parts (axles, plungers, bushings, pushers, shafts, spindles). In the petrochemical industry, metal structures and parts for units are made from it. It can be used on body parts as a welded stiffener and local reinforcement, which makes it possible to form a flanged surface.
The chemical industry, automotive industry and construction are the areas where the calibrated square finds its application. It is able to withstand high thermal, mechanical and chemical loads, and this endurance directly depends on the quality and grade of steel. Rolled steel is a universal material for solving many problems, therefore it is one of the most popular materials.