JIS G3466 Carbon Steel Square for General Structure Purposes.

This Japanese Industrial Standard specified the carbon steel square pipes, used for civil engineering architecture and other structures.


Chemical Compostion

Grade Chemical Compostion
C Si Mn P S
STKR 400 0.25max - - 0.040max
0.040max
STKR 490 0.18max 0.55max 1.50max 0.040max 0.040max

Mechanical Properties

Grade Mechanical Properties(min)
Tensile Strength(N/mm²)
Yield Strength(N/mm²)
Elongation(%)
STKR 400
400 245 23
STKR 490
490 325 23

The tolerances on dimensions are established in accordance with JIS G 3466.

Characteristics
Tolerances
Outside dimensions of side
(H,B100mm) 1.5mm
H : Longest side
(100mmH,B) 1.5%
B : Shortest side
-
Wall thickness(T)
(T3mm) 0.3mm

(3mmT) 10% in thickness
Unevenness of the flat portions of each side
(H,B100mm) 0.5mm

(100mmH,B) 0.5%
Squareness of sides
90°±1.5°
Corner dimension(S)
S≤3T
Straightness
0.3% in total length
Length
0, +50mm

Note:

1)The outside dimensions are measured across the flats at positions at least 50mm from the end of the HSS. (Private standard tolerance)