METHOD OF ROLLING DOUBLE-TEE FROM LOW-ALLOY STEEL Russian patent published in 2013 - IPC B21B1/00 B21B1/08 

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Double-tee section is made from low-alloy steel and has flanges with parallel faces and wall. Optimum distribution of steel over beam cross-section is ensured by section flexibility equal to wall height-to-wall thickness ratio does not exceed limit flexibility λ_{wall lim} that ensures wall stability without intermediate stiffness ribs and equals 65 while wall thickness, height and limit flexibility are specified by mathematical relations. Note here that section cross-section is distributed as follows: 50% - section wall, 25% - each flange. Besides, wall width-to-wall thickness does not exceed limit ratio that ensures local flange stability to add to strength That is, moment of resistance W_x cm³ and stiffness are increase.

EFFECT: decreased metal input

1 dwg, 2 tbl