JIS G 3466 SS400 STKR 400 STKR490 galvanized square hollow section 40x40x2.5
Special shape : Square and retangle shape seamless steel tubes
JIS G 3466 Carbon Steel Square and Rectangle tubes for general structure
Standard JIS G 3466
Deminsion 420mm*420mm upon requests
Wall thickness 0.5-50mm
Length 12m max
Application :for general structural purposes
Produce method:
- Forming welded steel tubes
- Seamless steel tubes into square
- Forming a steel sheet in coil into square section or into one pair of channel section followed by a continuous electric ressistance welding or automatic arc welding process.
|
CHEMICAL COMPOSITION % max
|
|
Steel grade
|
C
|
Si
|
Mn
|
P
|
S
|
|
STKR 400
|
0.25
|
-
|
-
|
0.04
|
0.04
|
|
STKR 490
|
0.18
|
0.55
|
1.5
|
0.04
|
0.04
|
|
MECHANICAL PROPERTIES min
|
|
Steel Grade
|
Tensile strength Mpa
|
Yeild point or proof stress Mpa
|
Elongation %
|
|
STKR 400
|
400
|
245
|
23
|
|
STKR 490
|
490
|
325
|
23
|
|
Dimensional tolerance
|
|
Specified item and dimension
|
Dimensional tolerance
|
|
length of side
|
100mm or under
|
±1.5mm
|
|
over 100mm
|
±1.5%
|
|
Unvenness of flat plate portions
|
side length 100mm or under
|
0.5mm max
|
|
side length over 100mm
|
within 0.5% of side length
|
|
Angularity made by adjacent flat plate portions
|
±1.5°
|
|
Dimension at corner:s
|
3t max
|
|
Length
|
+ not specified
0
|
|
Un-straightness
|
Within 0.3%
|
|
Wall thickness :t
|
Square steel tube manufacture by welding
|
under 3 mm ±0.3mm
3mm or over ±10%
|
|
Seamless square steel tube
|
under 4mm ±0.6mm
4mm or over ±15%
|
More: Torich JIS G3444 3466 Standard STK400 STKR 400 STKR490 Square Steel Pipe 20x20x2 used as table leg Square and rectangle Weight:
W=0.0157t(A+B-3.287t)
Coating: Hot dip zinc coating
Electrolytic zinc coating
Hot dip aluminium -coated
Hot dip zinc-5% aluminium alloy-coated
Hot dip 55% aluminium alloy coated
End: plain or charmfering
