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Stainless Steel Pipes | AISI 304/316L High-Temp Corrosion Resistance ⚡

Stainless Steel Pipes | AISI 304/316L High-Temp Corrosion Resistance ⚡

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Stainless Steel Pipes | AISI 304/316L High-Temperature Corrosion Resistance

Technical Specifications

Property AISI 304 AISI 316L
Material Grade UNS S30400 UNS S31603
Chemical Composition 18% Cr, 8% Ni, ≤0.08% C 16% Cr, 10% Ni, 2% Mo, ≤0.03% C
Tensile Strength 520–750 MPa 500–680 MPa
Yield Strength 215 MPa 290 MPa
Hardness (Rockwell B) 70 B 79 B
Temperature Resistance -196°C to 800°C -196°C to 843°C
Corrosion Resistance Good (general use) Excellent (chloride/marine)
Standard Compliance ASTM A312, A240, EN 1.4301 ASTM A312, A240, EN 1.4404
Dimensions (OD) 6–2500 mm 6–2500 mm
Wall Thickness 0.5–150 mm 0.5–150 mm
Surface Finish 2B, BA, No.4, Mirror 2B, BA, No.4, Mirror

Key Attributes

  1. High-Temperature Performance

    • AISI 304: Maintains structural integrity up to 800°C with oxidation resistance.
    • AISI 316L: Enhanced stability in extreme environments (e.g., chemical processing) up to 843°C.

  2. Mechanical Strength

    • Tensile Strength: stainless steel pipes made from 316L exhibit superior stress resistance in chloride-rich settings.
    • Bend Strength: Both grades withstand deformation under load, ideal for stainless steel pipes and fittings in HVAC and structural applications.

  3. Corrosion Resistance

    • 304: Resists atmospheric and mild chemical corrosion.
    • 316L: Molybdenum content combats pitting in marine/acidic environments.

Weight Calculation

The weight of stainless steel pipes is calculated using:

Where:

  • : Outer Diameter (mm)
  • : Wall Thickness (mm)

Example: A 100 mm OD pipe with 5 mm wall thickness weighs 11.69 kg/m.

 

Identification & Marking

  • Laser Etching/Stamping: ASTM/EN standards, heat number, and grade (e.g., "316L").
  • Color Coding: Optional bands for quick identification in industrial settings.

Why Do Stainless Steel Pipes Rust?

Despite "stainless" properties, corrosion may occur due to:

  1. Chloride Exposure: Coastal or de-icing salt environments accelerate pitting in 304.
  2. Intergranular Corrosion: Improper welding of 304 without post-annealing.
  3. Surface Contamination: Iron particles or grease disrupt the passive oxide layer.
  4. Low-Quality Alloys: Substandard Cr/Ni ratios reduce corrosion resistance.

Why Choose Our Stainless Steel Pipes?

  1. Premium Material Sourcing: Strict adherence to ASTM/EN standards for stainless steel pipes and fittings.
  2. Customization: Tailored dimensions, surface finishes, and stainless steel pipe clamps for unique projects.
  3. Certified Quality: ISO 9001, SGS, and third-party inspections ensure reliability.
  4. Global Applications: Proven performance in offshore platforms, pharmaceuticals, and food processing.
  5. Sustainable Choice: 100% recyclable material with minimal lifecycle costs
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