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ASTM A53 Steel Square Tube – Industrial, Mechanical & Construction Applications
| 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.
The ASTM STEEL PIPE specification covers both welded and seamless fabrication types.
Welded Types: ERW Pipe
Welding Compliance and Inspection for ASTM A53 Square Steel Pipe
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Welding Method: ERW (Electric Resistance Welding)
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Standards Compliance: Fully conforms to ASTM A53 welding process requirements
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Weld Quality: 100% of welds pass non-destructive testing (NDT)
Note: ERW welding ensures strong, uniform seams, meeting structural performance and safety standards for columns, trusses, and other load-bearing applications.
| 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 | Light-duty, low-pressure applications |
| 1½″ (38 mm) | Sch 40 / 14 Ga | 3.68 mm | Standard structural applications |
| 2″ (50 mm) | Sch 40 / 11 Ga | 3.91 mm | Structural, moderate load |
| 3″ (76 mm) | Sch 40 / 10 Ga | 5.49 mm | Heavy-duty structures, moderate pressure |
| 4″ (102 mm) | Sch 40 / 8 Ga | 6.02 mm | Common in construction, mechanical frames |
| 6″ (152 mm) | Sch 40 / 6 Ga | 7.11 mm | Large structural or industrial use |
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ASTM A53Square Steel Pipe - Core Scenarios & Specification Adaptation
| Category | Parameter / Scenario | Options / Details | Notes / Application |
| Core Scenarios | Structural Construction | – | Steel frames, columns, beams, scaffolding, and general building support structures. High-strength Grade B often preferred. |
| Industrial Machinery & Equipment | – | Machine frames, conveyor supports, mechanical structures requiring precision square tubing. | |
| Pipeline & Fluid Transport | – | Low-pressure water, gas, and steam transportation using ERW or seamless pipes. | |
| Automotive & Fabrication | – | Frames, supports, and custom fabrication parts where carbon steel square tubing is required. | |
| Infrastructure & Outdoor Installations | – | Fencing, guardrails, support structures; can be galvanized for corrosion resistance. | |
| Specification Adaptation | Grade | A / B | Choose Grade A for light-duty or low-pressure use; Grade B for higher structural load or pressure. |
| Type | ERW / F / Seamless | ERW (Electric-Resistance Welded) for cost-effective solutions; Seamless for high-pressure or mechanical strength requirements. | |
| Size / Dimensions | 25 mm – 200 mm (1″ – 8″) | Custom sizes available; square tube dimensions depend on load and design requirements. | |
| Wall Thickness / Gauge | Sch 10 – Sch 80 / 6 Ga – 16 Ga | Adapt thickness according to structural load, pressure requirements, or local building codes. | |
| Surface Finish | Black / Galvanized | Galvanized recommended for outdoor or corrosive environments; black for indoor structural use. | |
| Length | 6 m / 12 m standard | Can be cut to customer specifications; longer lengths available for industrial projects. | |
| Key Takeaways | Versatile | – | ASTM A53 square steel pipe covers structural, industrial, and fluid transport applications. |
| Customizable | – | Dimensions, wall thickness, grade, type, and surface finish can all be adapted to project requirements. | |
| Durable | – | Grade B pipes and seamless types ensure higher strength and long-term reliability. | |
| Corrosion Protection | – | Galvanized pipes recommended for outdoor or humid environments. |
Basic Protection: Each bale is wrapped with tarpaulin, 2-3 desiccant packs are put in each bale, then bale is covered with heat sealed waterproof cloth.
Bundling: The strapping is 12-16mm Φ steel strap, 2-3 tons / bundle for lifting equipment in American port.
Conformance Labeling: Bilingual labels (English + Spanish) are applied with a clear indication of material, spec, HS code, batch and test report number.
Stable cooperation with shipping companies such as MSK, MSC, COSCO efficiently logistics service chain, logistics service chain are we to your satisfaction.
We follow the standards of quality management system ISO9001 in all procedure, and have strict control from packaging material purchase to transport vehicle scheduling.
Q: What standards do your Steel Pipe comply with for Central American markets?
A: Our products meet ASTM A53 Grade A/B standards, which are widely accepted in Central America. We can also provide products compliant with local standards.
Q: How long is the delivery time?
A: The total delivery time (including production and customs clearance) is 45-60 days. We also offer expedited shipping options.
Q: Do you provide customs clearance assistance?
A: Yes, we cooperate with professional customs brokers in Central America to help customers handle customs declaration, tax payment and other procedures, ensuring smooth delivery.
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Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
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