Armature classification

The manufacturing process consists of hot rolling carbon or low alloy steel. So as to diminish grain size, enhance the structure and raise the strength of the armatures, additives from titanium or zirconium are introduced into its composition. As a result, the principal element of reinforced concrete structures becomes reliable enough to withstand the effects of sudden temperature drops, excessive humidity and loads. This makes manufacturing and construction companies the main consumers of armatures.

For the manufacture of such rolled products, steel is selected in accordance with GOST 5781-82. The blanks are delivered in the form of rods, the diameter of which varies from 6 to 80 mm, the length is 6–12 meters. Provided that the cross-section of rolled products for the production of the armature does not exceed 12 mm, it may be supplied in coils.

Armature classification:

by profile type - smooth and corrugated;

by technology - cold-drawn and hot-rolled;

by application - functioning, structural or anchor;

by type of load - strained and not.

Note! Marking type A-l, A-ll is no longer used. According to GOST standards, it was superseded by the designations А240, А300, etc.

Prior to purchasing armatures, it is necessary to clarify the meaning of additional indices:

"C" - sustainability for welding;

"K" - corrosion resistance;

"At" is a thermally hardened material.

Modern building armatures are classified according to a number of criteria:

• material used (steel and non-metallic);

• production technology (rod, wire and rope);

• profile (round with periodic profile and smooth);

• functionality (tense and non-tense);

• purpose (assembly, working and distributional);

• assembly technology (knitted - frame and mesh, welded).

Depending on the physico-mechanical properties, the reinforcement is subdivided into classes, for each of which is used a certain steel grade: