Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
Available in stock sizes ranging from 40×40mm to 500×500mm with comprehensive material options and surface treatments.
| Product Type | Size Range | Thickness | Length |
|---|---|---|---|
| Round Pipe | OD 10mm - 1000mm | 4mm - 30mm | Custom lengths available |
| Square Pipe | 10×10mm - 1000×1000mm | 1.2mm - 30.0mm | Standard and custom |
| Rectangle Pipe | 20×40mm - 400×700mm | 1.2mm - 30.0mm | Standard and custom |
| L/T/Z Window Section | 28mm/38mm | 0.5mm - 1.5mm | Standard profiles |
SS400, S235JR, S275JR, S355JR, 1020, 1045, 4140, and equivalent standards
Black, galvanized, or painted finishes available
Export standard packing with bundles, seaworthy packaging, container shipment
Port: Shanghai, China
Lead Time: Within 30 days after deposit/L/C
Production Capacity: 10,000 MT per month
Main Markets: Europe, America, Africa, Southeast Asia
S355 structural steel offers superior mechanical properties compared to S235 and S275 grades, with enhanced yield strength and tensile strength characteristics.
- S - Structural steel designation
- 355 - Minimum yield strength (N/mm²) for thickness ≤16mm
- JR - 27J impact energy at 20°C
- J0 - 27J impact energy at 0°C
- J2 - 27J impact energy at -20°C
- K2 - 40J impact energy at -20°C
| Steel Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cu (%) | Deoxidation |
|---|---|---|---|---|---|---|---|
| S355JR | ≤0.24 | ≤0.55 | ≤1.60 | ≤0.035 | ≤0.035 | ≤0.55 | Rimmed steel not allowed |
| S355J0 | ≤0.20 | ≤0.55 | ≤1.60 | ≤0.030 | ≤0.030 | ≤0.55 | - |
| S355J2 | ≤0.20 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.025 | ≤0.55 | Fully killed |
| S355K2 | ≤0.20 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.025 | ≤0.55 | Fully killed |
| Thickness (mm) | d≤16 | 16< d ≤40 | 40< d ≤63 | 63< d ≤80 | 80< d ≤100 | 100< d ≤150 | 150< d ≤200 | 200< d ≤250 |
|---|---|---|---|---|---|---|---|---|
| S355 Grades | 355 | 345 | 335 | 325 | 315 | 295 | 285 | 275 |
| Thickness (mm) | d<3 | 3 ≤ d ≤ 100 | 100 < d ≤ 250 |
|---|---|---|---|
| S355JR | 510-680 | 470-630 | 450-600 |
| Thickness (mm) | 3≤d≤40 | 40< d ≤63 | 63< d ≤100 | 100< d ≤150 | 150< d ≤250 |
|---|---|---|---|---|---|
| S355JR | 22 | 21 | 20 | 18 | 17 |
| S355K2 | 20 | 19 | 18 | 18 | 17 |
Our square tubes are widely used in structural applications across multiple industries:
Steel structures, large venues, exhibition centers, bridge supports, airport construction
Lifting machinery, storage shelves, mining support, three-dimensional garages
Shipbuilding, railway vehicles, vehicle manufacturing, transportation facilities
Wind power equipment, medical equipment, sport equipment, home furniture, ornamental uses
Strategic partnerships with steel manufacturers ensure lowest market prices while maintaining strong financial stability and diversified operations.
Professional quality control from procurement to sales with comprehensive auditing and reliable steel mill quality tracking.
24-hour distribution services via multiple transport methods with simplified ordering processes and comprehensive product range.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.