TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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JIS G 3444 STK290,STK400 STK500 STK490 STK540 Carbon Steel Tubes for General Structural Purposes
JIS G 3444 Carbon Steel Tubes for general structural purposes
Standard :JIS G 3444
Size range:OD 5-420mm * WT 0.5-50mm *12000mm max
Application:for general structural purposes
Steel Grade:STK290,STK400 STK500 STK490 STK540 or per customer's request.
Relevant standard :KS D 3566 ASTM A500,A252, A501, BS 6323
Tube manufacture method:
1. Seamless
2. butt-welded
3. Automatic arc welded
4. electric resistance welded
Finishing method:Hot finished,cold finished,As electric resistance welded
NOTE:Heat treatment: If necessary,appropriate heat treatment may be applied to the tube.
CHEMICAL COMPOSITION % max | |||||
Steel grade | C | Si | Mn | P | S |
STK290 | - | - | - | 0.05 | 0.05 |
STK400 | 0.25 | - | - | 0.04 | 0.04 |
STK490 | 0.18 | 0.55 | 1.65 | 0.035 | 0.035 |
STK500 | 0.24 | 0.35 | 0.30-1.30 | 0.04 | 0.04 |
STK540 | 0.23 | 0.55 | 1.50 | 0.04 | 0.04 |
Notes:1. if necessary,alloying elements other than specified in the above table may be added | |||||
MECHANICAL PROPERTIES min | ||||||
Steel grade | Tensile strength Mpa | Yield point or proof stress Mpa | Tensile strength in weld zone Mpa | Flattening | Bendability | |
Distance between plates(H) | Bend angle | Inside radius | ||||
Applied outside diameter | ||||||
All outside diameter | All outside diameter | All outside diameter | All outside diameter | 50mm max | ||
STK290 | 290 | - | 290 | 2/3D | 90° | 6D |
STK400 | 400 | 235 | 400 | 2/3D | 90° | 6D |
STK490 | 490 | 315 | 490 | 7/8D | 90° | 6D |
STK500 | 500 | 355 | 500 | 7/8D | 90° | 6D |
STK540 | 540 | 390 | 540 | 7/8D | 90° | 6D |
Note 1 D of this table is the outside diameter of the tubes.
Note 2 Standard of bend angle be the start point of bending
