Premium Carbon Steel Square Pipe Supplier | Q235B, Q355B, ASTM A500 | Various Sizes Structural Tubing for Sale
Thickness： 0.8-30mm or customized
Length： 0-12m or as customized
Surface：Bare, Black Painted, Varnish Coating, galvanized etc
Standard：ASTM，AISI，JIS,GB， DIN,EN
Products can be customized
Email: [email protected]
WhatsApp/WeChat/Mobile：+86-18753135285
Carbon Steel Square Pipe performance parameters
| Product Name | Carbon Steel Square Pipe |
|---|---|
| Material | Q195 = S195 / A53 Grade A |
| Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2 | |
| Q355 = S355JR / A500 Grade B Grade C | |
| Model | Thickness: 0.8-30mm or customized |
| Length: 0-12m or as customized | |
| Standard | DIN 2440, ISO 65, EN10219 |
| GB/T 6728 | |
| JIS G3466 | |
| ASTM A53, ASTM A500/A500M, ASTM A36 | |
| Place of Origin | Shandong, China |
| Delivery time | 7-15 days |
| Surface finishing | Bare, Black Painted, Varnish Coating, galvanized etc. |
| Certificate | ISO 9001,ISO14001,ISO45001,ISO50001.CE,LR,ICC,SGS.BV etc |
| Supply capacity | 2500 ton/monthly |
| MOQ | 1 ton |
| Trade Terms | FOB, CIF, CFR, EXW, FCA, FAS, etc. |
| Payment | TT, LC, We can negotiate |
| Tests | squash test, extension test, hydrostatic test, crystal decay test, heat resistance |
| Application | Construction / building materials steel pipe Fence Post |
| Solar Mounting Component | |
| Advantages | 1. Quick Respond |
| 2. Reasonable Price | |
| 3. Abundant stock and prompt delivery | |
| 4. Flexible payment terms | |
| 5. Rich experiences in manufacturing and exporting | |
| 6. Excellent Quality |
Advantages of Our Carbon Steel Square Pipe
Superior Geometric Structure and Torsional Strength
Our carbon steel square pipes feature a symmetrical closed-section design, offering higher torsional strength and longitudinal bending resistance compared to round pipes of equal weight. This structural stability makes them the ideal choice for building frames, tower cranes, and heavy machinery supports, ensuring structural integrity while optimizing material usage.
Precise Tolerance Control and Ease of Fabrication
Thanks to advanced ERW (Electric Resistance Welding) production lines and precision sizing processes, our square pipes offer excellent dimensional tolerances and surface flatness. The flat sides make welding, bolting, and layout fabrication exceptionally easy, significantly boosting efficiency in on-site construction or factory assembly while reducing labor costs.
Excellent Cost-Effectiveness and Versatile Surface Finishes
As a cost-effective structural material, mild steel square tubing significantly reduces material budgets while ensuring engineering quality. We offer various surface finish options, including black pipe, oiling, primer, and hot-dip galvanizing, to meet different anti-corrosion requirements. Its versatility ensures superior performance across applications ranging from furniture manufacturing to large-scale bridge engineering.
Packaging style of Carbon Steel Square Pipe
FAQs
How can I determine the required wall thickness of the square pipe to ensure structural safety?
Load capacity depends on tensile strength (e.g., Q355B vs. Q235B), span, and wall thickness. We provide recommendations based on your engineering drawings. For high-load projects, heavy-wall square tubing is recommended. We provide a Mill Test Certificate (MTC) for your engineers to perform structural mechanical calculations.
When performing 45-degree miter welding, is the weld seam strong and resistant to deformation?
Our square pipes are made of premium mild steel with excellent weldability. Due to uniform forming and flat surfaces, they achieve tight fit-up for miter joints, minimizing welding distortion and ensuring joint strength. High yield rates can be achieved through both manual and robotic automatic welding.
Should I choose the lower-priced black pipe or a pre-galvanized square pipe?
If your project requires later powder coating or extensive welding, black pipe is a more economical and flexible choice. If the tubing will be exposed outdoors and requires no further surface treatment, pre-galvanized pipe offers immediate rust protection, saving the cost of post-production manual painting.
Will the internal weld bead affect my telescoping or sleeve installation?
By default, there is a slight internal weld bead. If your application involves telescoping or sleeve assembly, please inform us in advance. We can provide “flash removed” treatment to ensure a smooth inner wall, meeting precision nesting requirements.
How do you ensure the four corners of the pipe are a standard 90 degrees?
We utilize a multi-pass sizing roll process to strictly control the corner radius and diagonal tolerances. Our products comply with ASTM A500 or EN 10219 standards, ensuring excellent squareness and preventing cumulative errors caused by angular deviations during large-scale frame assembly.
Ready to Secure Your Next Project?
Whether you need a bulk wholesale quote or a custom engineering solution, our technical team is here to help. Fill out the form and we will get back to you within 24 hours.