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ASTM A53 ERW / Seamless Square Steel Tubing – Custom Sizes Available
| ASTM A53 Square Steel Pipe Detail | |||
| Material Standard | ASTM A53 Grade A/B | Length | 6m/20ft、12m/40ft, and custom lengths available |
| Wall Thickness Tolerance | ±10% | Wall Thickness | 1.2mm-12.0mm, Customized |
| Side Tolerance | ±0.5mm/±0.02in | Quality Certification | ISO 9001, SGS/BV Third-Party Inspection Report |
| Side | 20×20 mm, 40×40 mm, 50×50 mm,60×60 mm,70×70 mm,75×75 mm,80×80 mm,Customized | Applications | Steel structure frames, various structural components and special-purpose supports for multiple fields |
| ASTM A53 Square Steel Pipe – Chemical Composition by Grade | |||||
| Grade | Carbon (C) % Max | Manganese (Mn) % Max | Phosphorus (P) % Max | Sulfur (S) % Max | Notes |
| A | 0.25 | 1.2 | 0.05 | 0.05 | Suitable for low-pressure and general structural applications. |
| B | 0.3 | 1.2 | 0.05 | 0.05 | Higher strength; widely used for pressure and structural applications. |
| ASTM A53 Square Steel Pipe – Mechanical Properties | |||||
| Grade | Type | Yield Strength (MPa / ksi) | Tensile Strength (MPa / ksi) | Elongation % (in 50 mm) | Notes / Typical Applications |
| A | ERW / Seamless | 205 MPa / 30 ksi | 240–350 MPa / 35–50 ksi | 30% | Suitable for low-pressure, general structural applications. |
| B | ERW / Seamless | 240 MPa / 35 ksi | 415 MPa / 60 ksi | 25% | Higher strength; widely used in structural and pressure applications. |
ASTM steel pipe refers to carbon steel pipe used in oil and gas transmission systems. It is also used to transport other fluids such as steam, water, and mud.
ASTM A53 Square Steel Tube Manufacturing and Welding Quality
ASTM A53 square steel tubes are available in both welded and seamless forms. The most common welded form is resistance welded (ERW) steel tube, widely used in structural and industrial applications.
Welded Tube Type
Manufacturing Process: Resistance Welding (ERW)
Standard: Conforms to ASTM A53 standard
Quality Inspection: Welds are subjected to non-destructive testing (NDT) to ensure integrity and consistency
Performance: Reliable strength, dimensional accuracy, and stable mechanical properties
ERW Steel Pipes are commonly used in steel structures, building columns, support frames, trusses, warehouses, and other load-bearing applications, providing reliable performance and cost-effective project solutions.
| ASTM A53 Square Steel Pipe – Typical Wall Thickness / Gauge | |||
| Nominal Size (in / mm) | Schedule / Gauge | Wall Thickness (mm) | Notes |
| 1″ (25 mm) | Sch 10 / 16 Ga | 2.77 mm | For light-weight working conditions & low-pressure service |
| 1½″ (38 mm) | Sch 40 / 14 Ga | 3.68 mm | General-purpose structural service scenarios |
| 2″ (50 mm) | Sch 40 / 11 Ga | 3.91 mm | Structural usage under medium load capacity |
| 3″ (76 mm) | Sch 40 / 10 Ga | 5.49 mm | Heavy-load frameworks with medium bearing pressure |
| 4″ (102 mm) | Sch 40 / 8 Ga | 6.02 mm | Widely adopted in construction & mechanical frame fabrication |
| 6″ (152 mm) | Sch 40 / 6 Ga | 7.11 mm | Ideal for large-scale structural and industrial projects |
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ASTM A53Square Steel Pipe - Core Scenarios & Specification Adaptation
| Category | Parameter / Scenario | Options / Details | Notes / Application |
| Core Application Scenarios | Structural Construction Works | – | Applied for steel frameworks, pillars, girders, scaffolding and conventional building load-bearing structures. Grade B material with enhanced strength is prioritized for most building projects. |
| Industrial Machinery & Facility Fabrication | – | Used for machine base frames, conveyor fixing brackets and customized mechanical structures that demand high-precision square hollow sections. | |
| Pipeline & Medium Conveyance | – | Suitable for low-pressure delivery of water, natural gas and steam, adopting ERW welded pipes or seamless steel pipes for conveyance systems. | |
| Automotive Manufacturing & Metal Processing | – | Applied to vehicle chassis brackets, fixing supports and tailored metal components made of carbon steel square tubes. | |
| Civil Infrastructure & Outdoor Facilities | – | Fit for boundary fences, roadside safety rails and outdoor supporting frames; hot-dip galvanized finish is optional for anti-rust performance. | |
| Custom Specification Options | Material Grade | Grade A / Grade B | Grade A fits light-load and low-pressure working conditions; Grade B delivers better bearing capacity for heavy structural and pressure-bearing scenarios. |
| Pipe Processing Type | ERW / F / Seamless | Electric Resistance Welded (ERW) pipes feature cost advantages for regular use; seamless pipes serve high-pressure scenarios requiring superior mechanical toughness. | |
| Outer Dimension Size | 25 mm – 200 mm (1″ – 8″) | Non-standard customized sizes are available; tube dimensions are determined by on-site load parameters and engineering design standards. | |
| Pipe Wall Thickness | Sch 10 – Sch 80 / 6 Ga – 16 Ga | Wall thickness shall be selected based on actual structural load, working pressure and local official construction regulations. | |
| Surface Treatment | Black Finished / Galvanized | Galvanized coating is recommended for outdoor and corrosive working sites; black bare steel is applicable for indoor structural installation. | |
| Delivery Length | 6 m / 12 m standard length | On-site cutting service is supported per client demands; extended customized lengths are provided for large-scale industrial projects. | |
| Core Product Advantages | Wide Application Compatibility | – | ASTM A53 square steel pipes can satisfy structural building, industrial equipment and fluid conveyance multi-scenario demands. |
| Full Customization Support | – | Tube size, wall thickness, steel grade, processing type and surface finish can be modified to match personalized project demands. | |
| High Structural Stability | – | Grade B steel grade and seamless tubular structures guarantee outstanding strength and long-term service stability. | |
| Reliable Anti-corrosion Performance | – | Galvanized finished pipes are prioritized for outdoor exposure, humid and salt-rich corrosive service environments. |
Protective Packaging:
The entire package is wrapped in heavy-duty waterproof tarpaulin and filled with desiccant. An additional waterproof outer layer protects the product from damage during sea transport and long-term storage.
Secure Strapping:
The bundled goods are securely fastened with 12-16 mm steel straps, with a standard bundle weight of 2-3 tons, ensuring safe and efficient loading and unloading at seaports.
Product Labeling:
The entire package is labeled with bilingual (English and Spanish) labels detailing product information, including material grade, customs code, batch number, and inspection report reference information.
Reliable Shipping Network:
Long-term partnerships with major shipping companies such as MSK, MSC, and COSCO ensure the safe and stable delivery of your goods worldwide.
1. Are you a manufacturer or a trader of ASTM A53 square steel tubing?
Up to now, Royal Steel Group is specialized in offering A53 Steel Pipe ERW and seamless square steel tubing in the integrated factory supply chain for world construction and industry with one hand.
2. Could you tell me the sizes you can supply?
We have a wide range of sizes, wall thicknesses and lengths of square tubing available. We could also do custom specifications according to your project requirements.
3. Do you have quality certificates?
Yes. We deliver MTC, EN10204 3.1 certificates, SGS/BV inspection reports and more quality documents if you need.
4. Do you provide customized processing services?
Yes. We also provide value-added processing services, such as cutting, drilling, punching, galvanizing, painting, and more.
5. Royal Steel Group is your best square steel tubing supplier?
We provide reliable supply, strict quality control, competitive prices, professional export expertise and global logistics support for long term project procurement.
Contact Details
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Phone
Hours
Monday-Sunday: 24-hour Service
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