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12″ Stainless Steel Square Tube 316
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Size: 12
Product Type: Stainless Steel Square Tube
Grade: 316 Stainless Steel
UOM: FT
Product Overview
316 stainless steel square tube (AISI 316) is a premium austenitic alloy celebrated for its molybdenum content (2–3%), which enhances resistance to chlorides, acids, and pitting corrosion. Ideal for marine, chemical, and high-humidity environments, it combines strength, flexibility, and low maintenance into a single solution. Our 16 stainless steel square tube sizes range from 15mm to 600mm in outer diameter, with wall thicknesses customizable from 1.2mm to 120mm. As a leading supplier of stainless steel square tube, we adhere to ASTM A513, ISO 6385, and GB/T 12771 standards, ensuring global compatibility for bridges, pipelines, furniture, and automotive frames.
Key Specifications & Technical Attributes
Table 1: Core Specifications of 316 Stainless Steel Square 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
316 stainless steel square tube delivers exceptional tensile strength (515–700 MPa) and bending strength (420–570 MPa), making it suitable for load-bearing structures like bridge supports, railings, and industrial frames. Its seamless design ensures uniform stress distribution, reducing the risk of cracks or failures under pressure. The high 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 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:
- Marine applications: Boat hulls, dock structures, and tidal energy systems.
- Chemical processing: Tanks, reactors, and piping exposed to corrosive fluids.
- High-humidity environments: Outdoor furniture, roofing, and ventilation systems.
3. Weight Calculation
The weight of a stainless steel square 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 316 stainless steel square 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.
- 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 |
| Hot Rolling | Controlled heating at 1,150°C | Achieves uniform microstructure |
| Extrusion or Welding | Precision forming into square cross-sections | Maintains dimensional accuracy |
| 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
- Infrastructure: Bridge supports, railway tracks, and highway guardrails.
- Construction: Steel frames, staircase railings, and façade cladding.
- Marine: Shipbuilding components, offshore platforms, and buoy structures.
- Automotive: Exhaust systems, chassis supports, and interior trim panels.
- Aerospace: Aircraft structural components and satellite housings.
Why Choose Our Stainless Steel Square Tube?
- Superior Alloy Composition: Guaranteed 16–18% chromium, 10–14% nickel, and 2–3% molybdenum for unmatched corrosion resistance.
- 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 316 stainless steel square tube compare to 304?
A: 316 contains molybdenum, enhancing corrosion resistance to chlorides and acids—ideal for marine/chemical use.
Q: Can it be welded?
A: Yes, compatible with TIG, MIG, and plasma welding. Pre-heating may be required for thick walls.
Q: What is the maximum service temperature?
A: Up to 1,600°C for short-term exposure (e.g., aerospace applications).
Q: How do I prevent rust on 316 stainless steel square tube?
A: Regular cleaning, avoid abrasive tools, and apply protective coatings for harsh environments.
Q: What industries benefit most from 316 square tubing?
A: Marine, chemical, aerospace, and construction sectors due to its corrosion resistance and strength.
Conclusion
316 stainless steel square tube remains a cornerstone of modern industry, combining seamless durability, corrosion resistance, and mechanical excellence. At [Your Company Name], we specialize in delivering premium stainless steel square tube with precision, reliability, and sustainability. Partner with us to engineer robust solutions for your most demanding projects!
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