The square and rectangular hollow section tubes made from mild steel Q235 are often used in building construction, support structures, and architectural applications. These tubes are known for their durability, ease of fabrication, and suitability for various welding and forming processes. The Q235 designation indicates that the steel is made from mild carbon steel.
| Product | Square and Rectangular Steel Pipe |
| Material | Carbon Steel |
| Grade | Q195 = S195 / A53 Grade A Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2 Q355 = S355JR / A500 Grade B Grade C |
| Standard | DIN 2440, ISO 65, EN10219, GB/T 6728,
JIS G3444 / G3466, ASTM A500, A36 |
| Surface | Bare/Natural BlackPainted
Oiled with or without wrapped |
| Ends | Plain ends |
| Specification | OD: 20*20-500*500mm ; 20*40-300*500mm
Thickness: 1.0-30.0mm Length: 2-12m |
| Chemical composition | Mechanical properties, WT≤16mm | ||||||||
| Standard | Steel grade | C (max.)% | Si (max.)% | Mn (max.)% | P (max.)% | S (max.)% | Minimum yield strength MPa |
Tensile strength MPa |
Minimum elongation % |
| GB/T 700-2006 | Q235A | 0.22 | 0.35 | 1.4 | 0.045 | 0.05 | 235 | 370-500 | 26 |
| GB/T 700-2006 | Q235B | 0.2 | 0.35 | 1.4 | 0.045 | 0.045 | 235 | 370-500 | 26 |
Application:
Construction / building materials steel pipe
Structure pipe
Fence post steel pipe
Solar mounting components
Handrail pipe
Strict Quality Control:
1) During and after production, 4 QC staffs with more than 5 years experience inspect products in random.
2) National accredited laboratory with CNAS certificates
3) Acceptable inspection from third party appointed/paid by buyer, such as SGS, BV.
4) Approved by Malaysia, Indonesia, Singapore, Philippines, Australia, Peru and UK. We own UL /FM, ISO9001/18001, FPC certificates
Packing and Delivery:
Packing Details : in hexagonal seaworthy bundles packed by steel strips, With two nylon slings for each bundles.
Delivery Details : Depending on the QTY, normally one month.
About us:
Tianjin Youfa was founded on July 1st, 2000. There are totally about 9000 employees, 11 factories, 193 steel pipe production lines, 3 national accredited laboratory, and 1 Tianjin government accredited business technology center.
31 square and rectangular steel pipe production lines
Factories:
Tianjin Youfa Dezhong Steel Pipe Co.,Ltd;
Handan Youfa Steel Pipe Co.,Ltd;
Shanxi Youfa Steel Pipe Co., Ltd
