Page 7 - square pipe
P. 7
SQUARE PIPE
Size and Properties
Grade : STKR400
B
T
H
SIAZES 21 x 21 x t
H x A x C
( mm. )
Thickness Section Area Weight Moment of inertia Radious of Gyration Modulus of Section
( Unit : mm ) ( Unit : cm .) 2 ( Unit : kg./m.) ( Unit : cm .) 4 ( Unit : cm.) ( Unit : cm .) 3
t Area cm 2 kg./m l x l y i x i y z x z y
1.2 0.91 0.72 0.58 0.58 0.80 0.80 0.56 0.56
1.4 1.05 0.82 0.66 0.66 0.79 0.79 0.62 0.62
1.7 1.24 0.97 0.75 0.75 0.78 0.78 0.71 0.71
2.0 1.42 1.11 0.83 0.83 0.76 0.76 0.79 0.79
% Chemical Composition (Max) Mechanical Properties (Min)
Grade
C Si Mn P S Yield Strength Tensile Strength Elongation
%
MPa
MPa
STKR290 - - - 0.050 0.050 - 290 -
STKR400 0.25 - - 0.040 0.040 245 400 23
STKR490 0.18 0.55 1.50 0.040 0.040 325 490 23
