| Product | Square and Rectangular Steel Pipe |
| Material | Carbon Steel |
| Standard | DIN 2440, ISO 65, EN10219, GB/T 6728, JIS G3444 /3466, ASTM A53, 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 |
S355 and Q355 are both designations for structural steel, but they come from different standards and have some differences in their specifications and applications.
S355 Steel
Standard: EN 10025-2 (European Standard)
Grade: S355
Description: S355 is a high-strength, low-alloy structural steel with a minimum yield strength of 355 MPa. It is commonly used in construction and structural applications due to its good weldability and machinability.
Common Subgrades:
S355JR: General structural steel with a minimum yield strength of 355 MPa and impact energy of 27J at room temperature.
S355J0: Minimum impact energy of 27J at 0°C.
S355J2: Minimum impact energy of 27J at -20°C.
Q355 Steel
Standard: GB/T 1591 (Chinese Standard)
Grade: Q355
Description: Q355 is a high-strength structural steel with a minimum yield strength of 355 MPa, similar to S355. The "Q" stands for "Qu" (yield point), and "355" refers to the minimum yield strength in MPa.
Common Subgrades:
Q355B: Minimum impact energy of 27J at 20°C.
Q355C: Minimum impact energy of 27J at 0°C.
Q355D: Minimum impact energy of 27J at -20°C.
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 8000 employees, 9 factories, 179 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
