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4″ Stainless Steel Rectangular Tube 304
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Size: 4
Product Type: Stainless Steel Rectangular Tube
Grade: 304 Stainless Steel
UOM: FT
Product Overview
304 stainless steel rectangular tube (AISI 304) is an austenitic alloy renowned for its balanced mechanical properties, corrosion resistance, and affordability. Composed of 16–18% chromium, 8–10.5% nickel, and trace carbon, it forms a stable passive chromium oxide layer on the surface, resisting oxidation in mild to moderate environments. As a leading provider of stainless steel rectangular tube stock, we offer seamless, welded, or extruded tubing in custom dimensions, ideal for bridges, furniture, and automotive frames. Our 304 stainless steel rectangular tube is certified to ASTM A513, ISO 6385, and GB/T 12771 standards, ensuring global compatibility.
Key Specifications & Technical Attributes
Table 1: Core Specifications of 304 Stainless Steel Rectangular Tube
| Specification | Details |
|---|---|
| Material | AISI 304 stainless steel (16–18% Cr, 8–10.5% Ni, ≤0.08% C) |
| Wall Thickness | 1.2mm – 120mm (standard), Custom thickness available |
| Outer Diameter | 15mm – 600mm (standard), Up to 1,200mm for specialized projects |
| Length | 3m – 12m (standard), Custom lengths per order |
| Hardness | Rockwell B 85–95, Brinell 190–220 (annealed or cold-worked states) |
| Corrosion Resistance | Resistant to atmospheric corrosion, water, and organic acids |
| Heat Resistance | Sustainable up to 870°C (continuous exposure), Ideal for moderate-temperature systems |
| Density | 8.03 g/cm³ |
| Young’s Modulus | 193 GPa |
Mechanical Properties & Performance
1. Tensile Strength & Bending Strength
304 stainless steel rectangular tube delivers tensile strength (515–700 MPa) and bending strength (420–570 MPa), making it suitable for load-bearing structures like bridge railings, warehouse shelving, and vehicle frames. Its ductility allows seamless forming through welding, cutting, or bending, while its fatigue resistance ensures longevity in dynamic environments such as conveyor belts or exhaust systems.
2. Corrosion Resistance Mechanism
The chromium oxide layer in 304 stainless steel acts as a self-healing barrier against rust and corrosion. However, its performance degrades in highly corrosive environments (e.g., seawater, chlorides, or strong acids). For such scenarios, upgrading to 316 stainless steel rectangular tube (with molybdenum) is recommended.
3. Weight Calculation
The weight of a stainless steel rectangular tube is calculated using:
Weight (kg/m) = (Outer Diameter – Wall Thickness) × Wall Thickness × Density / 1000
Example: A 100mm × 6mm tube weighs 3.85 kg/m. Custom calculations are provided for bulk orders, including logistics and handling fees.
4. Common Rusting Issues & Solutions
Even 304 stainless steel rectangular tube may rust under specific conditions:
- Chloride Exposure: Saltwater, road salts, or cleaning agents containing chlorine can degrade the passive layer. Regular maintenance and coatings (e.g., epoxy) mitigate risks.
- Mechanical Damage: Scratches or weld spatter exposes bare metal. Proper handling and post-processing (e.g., passivation) reduce this likelihood.
- Carbon Contamination: Low-carbon variants (304L) minimize sensitization during welding, preventing intergranular corrosion.
Manufacturing Process & Quality Assurance
Table 2: Production Workflow
| Step | Process | Purpose |
|---|---|---|
| Raw Material | High-purity chromium, nickel, and carbon | Ensures alloy composition accuracy |
| Hot Rolling | Controlled heating at 1,050°C | Achieves uniform microstructure |
| Extrusion or Welding | Precision forming into rectangular cross-sections | Maintains dimensional accuracy |
| Annealing | Solution annealing at 850°C | Removes internal stresses |
| Pickling & Passivation | Acid treatment to remove impurities | Restores corrosion resistance |
| Quality Control | UT, MT, and chemical analysis | Compliance with ASTM/ISO standards |
Applications Across Industries
- Construction: Steel frames, staircase railings, and façade cladding due to sleek appearance and low maintenance.
- Food Processing: Sanitary tubing for conveyor systems and equipment resistant to FDA-approved cleaning agents.
- Automotive: Exhaust components, chassis supports, and interior trim panels requiring hygiene and durability.
- Marine: Boat hulls (limited to freshwater exposure), dock structures, and freshwater piping.
- Energy: Solar panel frameworks and wind turbine supports in non-corrosive environments.
Why Choose Our Stainless Steel Rectangular Tube?
- Competitive Pricing: As a leading stainless steel rectangular tube stock provider, we offer unbeatable prices for bulk orders, ideal for budget-conscious projects.
- Customization: Tailored wall thickness, outer diameter, and surface finishes (polished, brushed, matte).
- Rapid Delivery: State-of-the-art facilities ensure prompt delivery, with global logistics partnerships.
- Technical Expertise: Free CAD drawings, material selection guidance, and compliance certificates (ISO, ASTM).
- Sustainability: Eco-friendly production practices and recycling programs align with ESG standards.
Frequently Asked Questions (FAQs)
Q: How does 304 stainless steel tube compare to 316?
A: 304 lacks molybdenum, making it less resistant to chlorides and acids. Opt for 316 in marine/chemical environments.
Q: Can 304 stainless steel tube be welded?
A: Yes, compatible with TIG, MIG, and plasma welding. Use 304L for thinner gauges to avoid weld decay.
Q: What is the maximum service temperature?
A: Up to 870°C for continuous use (e.g., industrial ovens). Short-term exposure to 925°C is possible with proper cooling.
Q: How do I prevent rust on 304 stainless steel tube?
A: Regular cleaning, avoid abrasive tools, and apply protective coatings for harsh environments.
Q: What industries use 304 stainless steel tube?
A: Construction, food processing, automotive, marine, and energy sectors due to its balance of cost and performance.
Conclusion
304 stainless steel rectangular tube remains a go-to material for industries prioritizing cost-effectiveness, durability, and versatility. At [Your Company Name], we specialize in delivering premium 304 stainless steel rectangular tube with precision, reliability, and sustainability. Partner with us to unlock the full potential of this alloy for your next project!
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