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5/16″ Stainless Steel Seamless Tube 304
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Size: 5/16
Product Type: Stainless Steel Seamless Tube
Grade: 304 Stainless Steel
UOM: FT
Product Overview
Stainless steel seamless tube 304 (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 leading seamless stainless steel tube manufacturers, we deliver precision-cast tubing in custom dimensions, compliant with ASTM A513, ISO 15614-1, and GB/T 13296 standards, ensuring global project compatibility. Our seamless stainless steel tube sizes range from 15mm to 1,200mm in outer diameter, catering to infrastructure, construction, and manufacturing demands.
Key Specifications & Technical Attributes
Table 1: Core Specifications of 304 Stainless Steel Seamless 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
Stainless steel seamless tube 304 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 seamless design ensures uniform stress distribution, enhancing durability in dynamic environments such as conveyor belts or exhaust systems. The high ductility allows seamless forming through welding, cutting, or bending, while its fatigue resistance ensures longevity in cyclic loading applications.
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 seamless tube (with molybdenum) is recommended. Key resistance mechanisms include:
- Chromium Oxide Formation: Passivation layer prevents oxygen diffusion.
- Nickel Addition: Enhances ductility and stabilizes the austenitic structure.
3. Weight Calculation
Determining the weight of a stainless steel seamless tube is straightforward:
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 stainless steel seamless tube 304 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 |
| Electroslag Casting | Melted material is poured into a water-cooled mold | Creates seamless hollow sections |
| Hot Rolling | Controlled heating at 1,050°C | Refines microstructure and dimensions |
| 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 Seamless Tube?
- Competitive Pricing: As leading seamless stainless steel tube manufacturers, 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 seamless tube 304 differ from welded tube?
A: Seamless tube has no weld lines, reducing stress concentrations and enhancing durability for high-pressure applications.
Q: Can it be used in extreme temperatures?
A: Short-term exposure to 925°C is feasible (e.g., industrial ovens), while continuous use up to 870°C is recommended.
Q: What industries benefit most from seamless 304 tubing?
A: Construction, food processing, automotive, marine, and energy sectors due to its balance of cost and performance.
Q: How do I prevent rust on seamless tube 304?
A: Regular cleaning, avoid abrasive tools, and apply protective coatings for harsh environments.
Q: What certifications do we provide?
A: ASTM A513, ISO 15614-1, GB/T 13296, and custom certifications per client requirements.
Conclusion
Stainless steel seamless tube 304 remains a go-to material for industries prioritizing cost-effectiveness, durability, and versatility. At [Your Company Name], we specialize in delivering premium stainless steel seamless tube with precision, reliability, and sustainability. Partner with us to engineer robust solutions for your next project!
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