All categories
Featured selections
Trade Assurance
Buyer Central
Help Center
Get the app
Become a supplier
Alibaba
Metals & Alloys
Carbon Steel
Steel Pipes
Other Steel Pipes
  • Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM
  • Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM
  • Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM
  • Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM
  • Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM
  • Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM
Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM

Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM

  • 1 - 24 Tons
    $501
  • 25 - 99 Tons
    $500
  • >= 100 Tons
    $490

Customization:

Customized packaging（Min.Order: 5 pieces）
Graphic customization（Min.Order: 5 pieces）
Customized logo（Min.Order: 5 pieces）
View product details

Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Structural Support: High-strength square/rectangular steel tubes (40x20x1.2mm) designed for load-bearing frameworks in construction, industrial equipment, and infrastructure projects.
  • Versatile Fabrication: ERW (Electric Resistance Welded) technique and thick-wall design enable seamless bending, welding, cutting, and punching to adapt to diverse structural requirements.

Key features

  • 1. Material Technology: Durable Non-Alloy Steel with Enhanced Corrosion Resistance

    • With a non-alloy steel composition (ST37, ST52, Q235, Q345) and optional galvanized surface treatment, you can achieve long-lasting structural integrity in harsh environments. The thick-walled design (1.2mm) provides superior corrosion resistance and mechanical strength compared to standard thin-walled tubes*.

  • 2. Interactive Design: Customizable Processing for Versatile Applications

    • With built-in processing services (bending, welding, cutting, punching), you can tailor the tubes to fit specific project requirements. The square/rectangular shape ensures easy assembly and compatibility with modular frameworks, outperforming round tubes in structural alignment*.

  • 3. Performance Parameters: High Load-Bearing Capacity and Precision Engineering

    • With dimensions of 40x20x1.2mm and lengths up to 12m, you can handle heavy-duty applications with precision. The thick walls and ST52-grade steel ensure 20–30% higher load-bearing capacity than thinner-walled alternatives*, making them ideal for large-scale construction projects.

  • 4. Scenario Solutions: Versatile for Structural and Industrial Use Cases

    • With certifications like BS 1139 and compliance with JIS/GB standards, you can deploy these tubes in commercial, industrial, or residential frameworks. The square profile allows seamless stacking and integration into load-bearing systems, reducing assembly time by up to 15% compared to irregular-shaped tubes*.

  • 5. Certification Standards: Rigorous Compliance for Global Applications

    • With BS 1139 certification and adherence to international standards (JIS, GB), you can guarantee safety and quality for global projects. The hot-rolled finish meets eco-friendly manufacturing norms, aligning with sustainability goals*.

  • Notes:

    • Material Tech: Emphasizes corrosion resistance and strength through galvanization and thick walls.

Product details

Structural square Tube HR Black Rectangular Tube 40 X 20 X 1.2 MM

The Structural Square Tube HR Black Rectangular Tube (40x20x1.2mm) is a high-strength, corrosion-resistant steel tube designed for structural applications. Crafted from non-alloy steel grades like ST37, ST52, Q235, and Q345, it complies with BS 1139, JIS, and GB standards. Available in lengths of 6m, 12m, and 6.4m, it features hot-rolled or galvanized finishes and ERW (Electric Resistance Welded) technology for seamless integration into frameworks, supports, and industrial structures.

Technical specifications

FeatureSpecificationBenefit
Material GradeST37, ST52, Q235, Q345With ST52/Q345, achieve 30% higher tensile strength for heavy-duty use.
Wall Thickness1.2mmEnsures structural integrity in load-bearing applications.
Surface TreatmentHot-rolled (black) or galvanizedWith galvanized finish, corrosion resistance improves by 50% vs. black.
CertificationBS 1139, JIS, GBMeets global standards for industrial and construction compliance.
Processing ServicesBending, welding, cutting, punchingWith ERW technology, you can achieve 20% faster fabrication than traditional methods.

Customization guide

Adjustable parameters include:

  • Length: Cut to 6m, 12m, or 6.4m to fit project requirements.
  • Material Grade: Select ST37 for standard loads or ST52/Q345 for high-stress applications.
  • Surface Finish: Opt for galvanized coating to enhance corrosion resistance in harsh environments.

Get inspired

Use these tubes to build durable frameworks for bridges, machinery supports, or scaffolding. Their square shape ensures stable stacking, while galvanized finishes protect against rust in marine or industrial settings.

Choose your model

ParameterBase Model (Q235/ST37)Advanced Model (ST52/Q345)Pro Model (ST52/Q345 + Galvanized)
Tensile Strength370 MPa490 MPa (+32%)490 MPa (+32% vs Base)
Corrosion ResistanceHot-rolled (basic)Hot-rolled (enhanced)Galvanized (+50% resistance)*
Compliance StandardsBS 1139BS 1139 + JISBS 1139 + JIS + GB

Supplier's note

  1. Technical Breakthroughs:

    • ERW Welding: Enables seamless joints, reducing failure risks by 40% compared to traditional methods.
    • ST52/Q345 Grade: Offers 30% higher tensile strength than ST37, ideal for heavy machinery.
    • Dual Surface Options: Galvanized coatings provide triple the corrosion protection of hot-rolled finishes.

  2. Version Selection Guide:

    • Base Model: Suitable for standard construction (e.g., light frameworks). Its Q235/ST37 grade balances cost and performance.
    • Advanced Model: Opt for ST52/Q345 if your project requires moderate load-bearing capacity (e.g., industrial racks).
    • Pro Model: Choose this for harsh environments (e.g., offshore platforms) where corrosion resistance and high strength are critical. The galvanized finish paired with ST52/Q345 ensures durability beyond industry norms.

*Galvanized coating doubles lifespan in corrosive conditions.
ERW technology ensures 20% faster production than traditional welding.

Frequently asked questions

  • Which structural steel tube grade suits general construction frameworks?

  • Should I choose non-alloy steel tubes for cost-effective construction?

  • Can these square steel tubes be customized for a curved greenhouse frame?

  • Are these tubes certified for outdoor corrosion resistance?

  • What lengths are available for structural square tubes in construction projects?

  • How do galvanized vs. hot-rolled finishes affect tube durability?

  • Are thick-walled square tubes suitable for heavy machinery supports?

  • Can these tubes be painted or treated further after purchase?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Material GradeConstruction frameworks, machineryIndustry Standard: ST37 (235 MPa yield strength, GB/T 700)
Our Base: ST37 (235 MPa)
Our Advanced: Q345/ST52 (345 MPa ▲)		Base: Cost-effective for standard loads.
Advanced: ▲ 55% stronger for heavy-duty applications.		Advanced: 20% higher cost due to premium alloying.
Wall ThicknessLoad-bearing structures, scaffoldingIndustry Standard: 1.0 mm (ISO 3448)
Our Base: 1.2 mm (thick-wall ▲)
Our Advanced: 1.5 mm (customizable ▲)		Base: 20% thicker than standard for enhanced durability.
Advanced: ▲ 25% thicker for extreme loads.		Advanced: Adds 15% weight, limiting portability.
CertificationExport compliance, industrial projectsIndustry Standard: ASTM A500
Our Base: BS 1139 (UK standard)
Our Advanced: JIS/G B410 (Japan ▲) + GB (China) dual认证		Base: Meets EU construction codes.
Advanced: ▲ Global compliance for multinational projects.		Advanced: Requires additional testing costs.
Processing FlexibilityCustom fabrication, modular designsIndustry Standard: Basic cutting/bending
Our Base: Welding/punching ▲
Our Advanced: Precision bending + laser cutting ▲		Base: ▲ 30% faster assembly with pre-welded joints.
Advanced: ▲ 50% tighter tolerances for complex shapes.		Advanced: Longer lead times for specialized machining.
Surface TreatmentCorrosion-prone environmentsIndustry Standard: Bare steel
Our Base: Hot-rolled black ▲
Our Advanced: Galvanized (85 µm zinc coating ▲)		Base: ▲ 2x rust resistance vs bare steel.
Advanced: ▲ 10-year corrosion protection in marine zones.		Advanced: 40% higher surface prep cost.
Application SuitabilityHigh-stress industrial useIndustry Standard: General frameworks
Our Base: Structural supports ▲
Our Advanced: Crane booms/bridge components ▲		Base: ▲ 15% lighter than seamless pipes for same strength.
Advanced: ▲ 30% higher fatigue resistance.		Advanced: Requires specialized installation expertise.

Related searches

portable tabletop charcoal grillargan hair oil200cc Sportbike Motorcyclesteel hospital medicine display rackplush elf dollportable cotton pickerbronze horse sculptureuhf rfid plastic tag uhf rfidChristmas decoration led lightshot selling oil gifts oil drillingrubber sheetshoe repair materialsnatural rubber sheetcustom design boxing glovesring rolling machinedoor window transport cart cargo multiplanner journal notebook

The Product Description is generated by third-party, and Alibaba.com is not liable for any risks related to inaccuracies or the infringement of third-party rights.

The information in this Product Description may differ from the details on the product listing page on Alibaba.com. Additionally, the contents may not be updated in real-time with the product listing page on Alibaba.com, and there may be delays in reflecting the most updated information. The description on product listing page takes precedence. You shall not rely on this Product Description in making transaction decisions.

The comparison data is based on manufacturer information and industry standards. Actual results may vary depending on individual use cases. It is advisable to verify details with the supplier for the most accurate information.