Among the most common types of metal rolling sorting species, A1 reinforcement is especially allocated. This type of product belongs to the number of hot rolled, it is distinguished by a round cross section, it can be manufactured as smooth and with a rifer for better clutch with concrete. This type of reinforcement variety from high-quality low-alloyed carbon steel, or wire made by the cold broach method is produced.
Due to good qualities regarding the strength and resistance to the loads of all types, the A1 reinforcement has been widely used in construction, and even in the sphere of pre-intense structural elements. Otherwise, to find facilities in which the A1 fittings are used in industrial complexes, when strengthening ceilings, fences, walls, in high-altitude construction. Such an extensive sphere of application promotes light welding in steel reinforcement frames, high strength with relatively low weight. Due to small chemical activity, it is also worth buying an A1 reinforcement for use in aggressive environments, including natural gas and chlorine. This factor allowed us to expand the scope of the A1 reinforcement to the oil and gas and coal industry. In addition, its wide distribution contributes to a relatively affordable price of A1 reinforcement.
Such shortcomings are allowed as ovality of the cross section of the A1 reinforcement. At the same time, it should fit into tolerances for minus and positive value of the diameters of the finished product.
The cutting of the A240 reinforcement into individual rods is also regulated in relation to the maximum permissible deviations. If the supply has a rods up to 6 meters long, then with normal accuracy, the difference in + 50mm is allowed, and with elevated - +25. If large segments of A240 fittings are realized, then for them, assumptions in + 70 and 35 mm are used accordingly.
It should be emphasized that the finished rods should be direct, technological requirements are allowed to deviate in this regard by no more than 0.6% of the length of the measured segment of the A1 reinforcement.
In addition to controlling the manufacturing process, the A1 GOST 5781 reinforcement is subjected to tests after the completion of the batch manufacturing. One of the most common types of such checks is the bending of the product in order to identify its relative elongation in the deformation process. The standard regulates that this parameter in the quality of the A240 reinforcement products should not exceed 25 percent.
In general, the verification is as follows: hire in a cold condition bends 180 degrees around the mandrel. Naturally, high-quality A1 reinforcement and past all stages of production in accordance with the requirements of regulatory documents should take these tests. Various types of A240 fittings suggest the use of various mandrels for testing. So for sections up to 20 millimeters, the mandrel equal to the diameter is used, for large rods - 4 times large.
But it is possible to buy A1 valves A1 of proper quality, guided by other parameters. There are a number of aspects, the monitoring of which is carried out visually, so small foci of rust, traces from rolled defects, such as bubbles and prints, as well as ripples and scaly are allowed to rent this class. At the same time, the rods of fittings A1 with captives, sunsets and tension cracks are immediately braked.
According to the requirements of the same state standards, the manufacturer of high-quality products is obliged to bring their products in accordance with the standards at least 95 percent.
Compare reinforcement A1 and A3
Any specialized market offers an extensive product range, including a variety of fittings. For example, not every consumer will be able to distinguish A1 and, for example, A3, however, these types of products have many differences, both in technical terms and in terms of application. Compare two of these types of construction fittings.
Visually, these two types of rental are not difficult to distinguish if the A1 fittings have a smooth surface, then the A3 reinforcement is produced exclusively with the rifrance. These subtlety of the appearance with the specifics of the application are associated, in particular, the A3 should ensure the maximum possible adhesion with the concrete mixture during reinforcement.
The second important aspect is strength. The composition of A3 adds a large number of alloying elements that significantly increase the strength of the rental. Of course, the A1 is inferior in this, however, doping complicates some types of rod treatments, such as welding. In this regard, the valve A1 GOST 5781 significantly exceeds A3.
If we consider the weaknesses of A3, this is its exposure to aggressive media. Armature A1 in this regard is much rushing, and therefore suitable for various conditions with the most severe features, for example, in the extreme north A3 will significantly give way to reinforcement A240. The first one in such a medium can crack and deform.
Another advantage of the type of rental under consideration is the price of A1 reinforcement. Since in production it is most simple and gives a minimal waste output, it turns out to be almost the most popular material of this class.
This page you can familiarize yourself with the variety of reinforcement prices A1, which provide manufacturers of A240 reinforcement in city Moscow and the region. Prices of reinforcement more than 20 different firms are specified in a constantly updated comparative table.