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<Welded carbon steel tubes>Square Welded carbon steel square pipes for general structural purposes
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Welded carbon steel square pipes for general structural purposes

JIS No. G3466
Grade STKR400 , STKR490

Standard sizes and Unit weights

(Unit : kg/m)
Side length\W.t
(mm)
1.6 2.3 3.2
40×40 1.88 2.62 3.58
50×50 2.38 3.34 4.50
60×60 2.88 4.06 5.50
60×30 2.13 2.98 3.99
75×45 2.88 4.06 5.50

Chemical components

(Unit : %)
Grade C
max
Si
max
Mn
max
P
max
S
max
STKR400 0.25 - - 0.040 0.040
STKR490 0.18 0.55 1.50 0.040 0.040

Mechanical properties

Grade Tensile strength, min N/mm2 Yielding point or proof stress, min N/mm2 Elongation %
No.5, min
STKR400 400 245 23
STKR490 490 325 23

Dimensional Tolerance

(Unit : mm)
Item Tolerance
Side length ±1.5
Unevenness of flat
surface on each side
0.5 or less
Squareness ±1.5゚
Dimension of each section : s 3W.t or less
Length +20
0
Straightness 3% or less of over all length
Wall thickness W.t<3 ±0.3
W.t≥3 ±10%
寸法図
  • Flat surfaces are indicated by the shaded areas in the figure below.
  • The straightness tolerance applies to major bends up and down and to the right and left.
  • The thickness tolerance applies to flat surfaces.

Examples

Pallets
Pallets

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