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Mechanical/Structural Steel Square Tube

Mechanical/Structural Steel Square Tube

Steel square tubing is an excellent candidate for most processing. Square steel tubing is available in A500 grade B or A513. Steel square tubes have a non-coated, semi-smooth grey finish. Mechanical/structural steel square tubing ?¡ãwall thickness± has a tolerance of +/- 10%. Common applications include trailers, frames, shelves, and structural support. ASTM A500 is the standards specification for cold-formed welded and seamless carbon steel structural tubing in rounds and shapes. ASTM A513 is the standard specification for electric-resistance-welded carbon and alloy steel mechanical tubing.

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Technical Specifications

Product Overview

Technical Description:

Mechanical/Structural Steel Square Tube is manufactured from high-quality carbon steel designed for structural and mechanical applications. These hollow structural sections (HSS) provide excellent strength-to-weight ratio and are ideal for construction, fabrication, and engineering projects.

Key Features:

  • High strength and durability for structural applications
  • Excellent weldability and machinability
  • Cost-effective solution for construction projects
  • Uniform wall thickness and dimensional accuracy
  • Available in multiple grades and finishes

Manufacturing Process: Produced using Electric Resistance Welding (ERW) or Submerged Arc Welding (SAW) processes, ensuring consistent quality and structural integrity. All tubes undergo rigorous quality control testing.

Applications: Building construction, structural frameworks, mechanical components, agricultural equipment, furniture manufacturing, architectural applications, and general fabrication projects requiring reliable structural performance.

🧪 Chemical Composition

Chemical Composition:
Element Min % Max % Typical % ASTM A500 Requirement
Carbon (C) - 0.26 0.18 ≤ 0.26
Manganese (Mn) - 1.35 0.90 ≤ 1.35
Phosphorus (P) - 0.035 0.020 ≤ 0.035
Sulfur (S) - 0.035 0.018 ≤ 0.035
Silicon (Si) - 0.40 0.25 ≤ 0.40
Copper (Cu) 0.20 - 0.25 ¡Ý 0.20 (when specified)
Chromium (Cr) - 0.15 0.08 ≤ 0.15
Nickel (Ni) - 0.15 0.08 ≤ 0.15
Iron (Fe) Balance Balance 98.2 Balance

⚙️ Mechanical Properties

Mechanical Properties:
Property ASTM Requirement Typical Value Test Method Temperature
Tensile Strength 400 MPa min 450 MPa ASTM A370 Room Temp
Yield Strength 315 MPa min 350 MPa ASTM A370 Room Temp
Elongation 23% min 28% ASTM A370 Room Temp
Hardness (Brinell) - 140 HB ASTM E10 Room Temp
Hardness (Rockwell B) - 78 HRB ASTM E18 Room Temp
Modulus of Elasticity - 200 GPa ASTM E111 Room Temp
Impact Energy (Charpy V) - 80+ J ASTM E23 Room Temp

🔬 Physical Properties

Physical Properties:
Property Value Unit Temperature Test Standard
Density 7.85 g/cm3 20¡ãC ASTM B311
Melting Point 1510-1540 ¡ãC - DSC Analysis
Thermal Conductivity 50.2 W/m·K 100¡ãC ASTM E1461
Specific Heat 460 J/kg·K 0-100¡ãC ASTM C351
Linear Expansion 11.7 μm/m·K 0-100¡ãC ASTM E228
Electrical Resistivity 170 nΩ·m 20¡ãC ASTM B193
Magnetic Permeability High μ/μ₀ Room Temp ASTM A342
Curie Temperature 770 ¡ãC - Ferromagnetic

📏 Product Specifications

Product Specifications:
Specification Available Range Standard Size Custom Available Tolerance
Outside Dimensions 20mm x 20mm - 400mm x 400mm Various Yes ±0.5mm
Wall Thickness 1.5mm - 16mm Various Yes ±10%
Length 1m - 12m 6m Yes +50mm/-0mm
Surface Finish Black, Galvanized, Painted Black Yes SSPC standards
Manufacturing Method ERW, SAW ERW Both ASTM standard
End Preparation Plain, Beveled, Threaded Plain Yes ANSI B16.25
Standards Compliance ASTM A500, A501, A618 A500 Multiple Full compliance
Grade Options Grade A, B, C Grade B Yes Per specification
Test Certificate Mill TC, EN 10204 3.1 Mill TC Yes Standard
Packaging Bundles, Crates, Containers Bundles Custom Export standard

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Our Advantages in Processing Mechanical/Structural Steel Square Tube

Precision Cold-Forming Technology

Precision Cold-Forming Technology

Our square tubes are manufactured through advanced cold-forming processes that maintain tight dimensional tolerances and superior surface finish.

Seamless Welding Integration

The uniform geometry and controlled chemical composition of our square tubes enable excellent weldability with minimal heat-affected zones. The precise corner radii and flat surfaces provide optimal access for welding equipment, allowing for strong, clean joints that maintain the structural integrity of the overall assembly.

Seamless Welding Integration
Multi-Stage Quality Control

Multi-Stage Quality Control

Each tube undergoes rigorous inspection processes including dimensional verification, surface quality assessment, and mechanical property testing. Our streamlined manufacturing process incorporates real-time monitoring systems that detect and correct variations immediately, ensuring every product meets or exceeds industry standards for strength, straightness, and surface quality.

YOUR TRUSTED STEEL

MANUFACTURING PARTNER

20
Years Experience
Leading Steel Manufacturing & Distribution
1000+
Brand Partners
Trusted by Global Industry Leaders
Full
Customization
Tailored Solutions for Every Project
50M+
Tons Delivered
High-Quality Steel Products Worldwide
95%
Client Retention
Long-term Partnership Success
ISO 9001
Certified Quality
International Standards Compliance
20
Years Experience
Leading Steel Manufacturing & Distribution
1000+
Brand Partners
Trusted by Global Industry Leaders
Full
Customization
Tailored Solutions for Every Project
50M+
Tons Delivered
High-Quality Steel Products Worldwide
95%
Client Retention
Long-term Partnership Success
ISO 9001
Certified Quality
International Standards Compliance
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Industries We Serve

Professional steel solutions across major industries

Construction

High-rise Buildings • Infrastructure • Commercial Real Estate

Oil & Gas

Pipeline Systems • Storage Equipment • Refinery Facilities

Manufacturing

Precision Machinery • Industrial Equipment • Automation Systems

Automotive

Body Structure • Chassis Components • Engine Parts

Shipbuilding

Hull Structure • Marine Engineering • Port Equipment

Energy & Power

Power Generation • Transmission Towers • Renewable Energy

Aerospace

Aircraft Materials • Precision Components • Special Alloys

Railway

Track Systems • Vehicle Manufacturing • Infrastructure

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