Steel tubes of square cross section

The tubes are generally used. They are tailored from steels 1.2 acc. to DSTU 2651-94, steels 0.8 kp acc. to GOST 1050-88.

Tubes of square cross section. Size range. GOST 8639-82 / GOST 13663-86
Outer size A, mm	Wall thickness, mm	Length of tubes, m
20x20	2.0; 2.5; 3.0	According to the length of tube the random length from 4 to 9 m are tailored
25x25	2.0; 2.5; 3.0
30x30	2.0; 2.5; 3.0; 3.5
40x40	2.0; 2.5; 3.0; 3.5; 4.0
50x50	3.0; 3.5; 4.0
60x60	3.0; 3.5; 4.0
80x80	3.0; 3.5; 4.0

According to the agreements between consumer and manufacturer other thicknesses tube manufacture are possible.

Tolerances in sizes for tubes of square cross section
Name of parameters	Limited deviations in strict tailoring for tubes
Outer sizes:	Normal	High
Welded steel tubes with size up 30 mm	± 0.3 mm	± 0.25 mm
Welded steel tubes with size over 30 up to 50 mm	± 0.4 mm	± 0.3 mm
Welded steel tubes with size over 50 mm	± 0.8%	± 0.8%
Wall thickness	± 10%	± 10%
Concavity of sides
up to 50 mm	0.5 mm	0.5 mm
over 50 mm	0.75 mm	0.5 mm

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