Thermally strengthened periodically profiled steel rods of the diameter 6-40mm - the so called thermic is used for the construction of strategic reinforced concrete structures, GOST 10884-81. According to the standard this rebar is made out of these types of steel:
AtIII - St (sp, ps);
AtIV, AtIVK - 20GS, 25G2S, 35GS, 28S, 10GS2, 08G2S, 25S2P;
AtV(K and SK) - 20GS, 20GS2, 08G2S, 10GS2, 28S, 25G2S, 35GS, 25S2R, 20HGS2;
AtVII - 30HS2.
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