Tianjin Lefin Industrial Co., Ltd is one of the most experienced manufacturers and suppliers of stkr400 stkr490 structural hollow section in China. Please feel free to buy high quality stkr400 stkr490 structural hollow section from our factory. Good service and reasonable price are available.
STKR400 STKR490 Structural Hollow Section
Material: Carbon Steel
Steel Grade: STKR400 (STKR41)，STKR490 (STKR50)
Standard: JIS G 3466 Carbon Steel Square and rectangle tubes for general structure
Shape: Square And Rectangle
Application: For General Structural Purposes
Key Words: Structural steel tubing, cold formed steel tube
Side Length: 10-1500mm
Wall thickness: 0.5-60mm
Length: In random lengths or exact length.
Producing method:
1. Forming welded steel tubes
2. Seamless steel tubes into square
3. 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 Strength Mpa |
Elongation % |
|
STKR 400 |
400 |
245 |
23 |
|
STKR 490 |
490 |
325 |
23 |
|
Wall thickness Tolerance |
Welded Hollow Section |
under 3 mm ±0.3mm |
|
Seamless Hollow Section |
under 4mm ±0.6mm |
External Corner Radius: Max 3T
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