REINFORCEMENT BAR FOR FABRICATION OF METAL GRIDS AND FRAMES Russian patent published in 2017 - IPC C21D8/08 E04C5/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy. To improve operational properties reinforcement bar of strength class 500–600 N/mm², diameter 5.5–22 mm, spooled in bundle, is made of hot-rolled steel with carbon content of no more than 0.24 wt%, reinforced by cold non-monotonic deformation accumulated by sign-variable flexure. Rolled section has actual yield strength no less than 500 N/mm², but does not exceed standardized one by more than 1.2 times, rupture strength to yield point 1.15–1.35, relative uniform elongation at maximum force gap no less than 7.0 %, tolerance for linear mass in negative field from rated value up to 6 % and rolling surface without scale, wherein bundle is formed by power line winding with relative density of 65–80 % and weight of 1.5–8.0 t.

EFFECT: invention is aimed at creation of hardened reinforcing bar for making gauzes and frames for reinforcing concrete structures of low-carbon steel.

1 cl, 4 tbl