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5/16″ Stainless Steel Seamless Tube 316
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Size: 5/16
Product Type: Stainless Steel Seamless Tube
Grade: 316 Stainless Steel
UOM: FT
Product Overview
Stainless steel seamless tube 316 (AISI 316) is an advanced austenitic alloy engineered with molybdenum (2–3%) to enhance resistance to chlorides, acids, and pitting corrosion. Its seamless construction eliminates weld lines, making it ideal for high-pressure environments where structural integrity is paramount. As a leading stainless steel seamless tube suppliers, we deliver precision-cast tubing in custom dimensions, compliant with ASTM A513, ISO 15614-1, and GB/T 13296 standards, ensuring global project compatibility.
Key Specifications & Technical Attributes
Table 1: Core Specifications of 316 Stainless Steel Seamless Tube
| Specification | Details |
|---|---|
| Material | AISI 316 stainless steel (16–18% Cr, 10–14% Ni, 2–3% Mo, ≤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 | Superior resistance to seawater, chlorides, and organic acids |
| Heat Resistance | Stable up to 1,600°C (short-term exposure), Ideal for high-temperature systems |
| Density | 8.03 g/cm³ |
| Young’s Modulus | 193 GPa |
Mechanical Properties & Performance
1. Tensile Strength & Bending Strength
Stainless steel seamless tube 316 exhibits exceptional tensile strength (515–700 MPa) and bending strength (420–570 MPa), making it suitable for high-stress applications like pipelines, hydraulic cylinders, and aircraft structures. Its seamless design ensures uniform stress distribution, reducing the risk of cracks or failures under pressure.
2. Corrosion Resistance Mechanism
The chromium oxide layer in 316 stainless steel forms a self-healing barrier against oxidation, while molybdenum enhances resistance to pitting corrosion caused by chlorides. This dual defense makes it ideal for:
- Oil & gas pipelines: Resisting sour gas and seawater contamination.
- Marine applications: Boat hulls, propeller shafts, and tidal energy systems.
- Chemical processing: Tanks and reactors exposed to corrosive fluids.
3. Weight Calculation
The weight of a stainless steel seamless tube is calculated using:
Weight (kg/m) = (Outer Diameter – Wall Thickness) × Wall Thickness × Density / 1000
Example: A 100mm × 10mm tube weighs 7.7 kg/m. Custom calculations are provided for bulk orders, including logistics and handling fees.
4. Common Rusting Issues & Solutions
Even stainless steel seamless tube 316 may rust under specific conditions:
- Chloride Exposure: Saltwater or de-icing salts can degrade the passive layer. Regular cleaning 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.
- High Temperatures: Prolonged exposure to extreme heat may weaken the oxide layer. Cooling systems and thermal insulation are recommended.
Manufacturing Process & Quality Assurance
Table 2: Production Workflow
| Step | Process | Purpose |
|---|---|---|
| Raw Material | High-purity chromium, nickel, molybdenum | Ensures alloy composition accuracy |
| Electroslag Casting | Melted material is poured into a water-cooled mold | Creates seamless hollow sections |
| Hot Rolling | Controlled heating at 1,150°C | Refines microstructure and dimensions |
| Annealing | Solution annealing at 1,040°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
- Oil & Gas: High-pressure pipelines, drilling rods, and storage tanks in corrosive environments.
- Aerospace: Structural components for aircraft frames and satellite launch systems.
- Hydraulic Systems: Cylinders, pistons, and valves requiring leak-free performance.
- Marine: Ship propulsion shafts, anchor chains, and tidal energy converters.
- Construction: Steel skeletons for skyscrapers and bridges.
Why Choose Our Stainless Steel Seamless Tube?
- Superior Alloy Composition: Guaranteed 16–18% chromium, 10–14% nickel, and 2–3% molybdenum for unmatched corrosion resistance.
- Seamless Integrity: Eliminates weld defects, ideal for high-pressure and explosive environments.
- 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.
- Cost Efficiency: Bulk order discounts and competitive pricing without compromising quality.
- Technical Support: Free CAD drawings, material selection guidance, and compliance certificates (ISO, ASTM).
Frequently Asked Questions (FAQs)
Q: How does seamless tube 316 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 1,600°C is feasible (e.g., aerospace), while continuous use up to 870°C is recommended.
Q: What industries benefit most from seamless 316 tubing?
A: Oil & gas, aerospace, and marine sectors due to its corrosion resistance and pressure-bearing capacity.
Q: How do I prevent rust on seamless tube 316?
A: Regular maintenance, 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 316 is a cornerstone of modern industry, combining seamless durability, corrosion resistance, and mechanical excellence. 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 most demanding projects!
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