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Stainless Steel Pipes | Precision-Polished 304/316L Surface Finish

Stainless Steel Pipes | Precision-Polished 304/316L Surface Finish

$498.00 SGD
$498.00 SGD
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Stainless Steel Pipes | Precision-Polished 304/316L Surface Finish

Technical Specifications

Property AISI 304 AISI 316L
Material Grade UNS S30400 / EN 1.4301 UNS S31603 / EN 1.4404
Chemical Composition 18–20% Cr, 8–12% Ni, ≤0.08% C 16–18% Cr, 10–14% Ni, 2–3% Mo
Tensile Strength 485–685 MPa 515–750 MPa
Yield Strength 170 MPa 205 MPa
Hardness (Rockwell B) 70–90 HRB 85–95 HRB
Temperature Resistance Up to 870°C Up to 925°C
Surface Finish Mirror Polished (Ra ≤0.2μm) Electropolished (Ra ≤0.1μm)
Standard Compliance ASTM A312, A269, EN 1.4301 ASTM A312, A249, EN 1.4404
Dimensions (OD) sch 40 stainless steel pipe: 6–2500 mm 6–2500 mm
Wall Thickness 0.5–150 mm 0.5–150 mm
Process ERW/Seamless, Cold Drawn TIG Welded, Seamless

Key Attributes

  1. Industrial-Grade Durability

    • AISI 304: Ideal for stainless steel chimney pipe systems in residential and industrial settings, offering oxidation resistance at high temperatures.
    • AISI 316L: Enhanced molybdenum (2–3%) combats pitting in chloride-rich environments, perfect for coastal and chemical processing plants.

  2. Mechanical Performance

    • Tensile Strength: AISI 316L outperforms 304 in high-stress applications, with tensile strength up to 750 MPa, suitable for sch 40 stainless steel pipe systems in oil refineries.
    • Bend Strength: Both grades support cold forming and welding, critical for custom fabrication in HVAC and structural frameworks.

  3. Surface Finish Excellence

    • Mirror Polishing: Achieves a reflective surface (Ra ≤0.2μm) ideal for hygienic applications in food processing and pharmaceuticals.
    • Electropolishing: Removes surface impurities and enhances corrosion resistance for stainless steel chimney pipe exposed to acidic flue gases.

Weight Calculation

The weight of stainless steel pipes is calculated using:

Where:

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

Example: A sch 40 stainless steel pipe with 100 mm OD and 5 mm wall thickness weighs 11.69 kg/m.

 

Identification & Marking

  • Laser Etching: ASTM/EN standards, heat number, and grade (e.g., "304" or "316L").
  • Color Coding: Optional bands for inventory management in industrial settings.

Why Do Stainless Steel Pipes Rust?

Despite their corrosion resistance, rust can occur due to:

  1. Chloride Exposure: Coastal or industrial environments degrade passive oxide layers, especially in welded joints without post-weld cleaning.
  2. Intergranular Corrosion: Improper welding of 304 without nitrogen stabilization leads to chromium carbide formation at grain boundaries.
  3. Surface Contamination: Iron particles from cutting tools or grease disrupt the protective chromium oxide layer.
  4. Low-Quality Alloys: Substandard nickel/molybdenum ratios reduce resistance to reducing acids like hydrochloric.

Applications

  • AISI 304: Food processing, stainless steel chimney pipe, and architectural handrails.
  • AISI 316L: Offshore platforms, desalination plants, and chemical reactors.

Why Choose Our Stainless Steel Solutions?

  1. Factory-Direct Pricing: Eliminate middlemen—pipe stainless steel suppliers ensure competitive rates and faster delivery.
  2. Certified Quality: ISO 9001, ASTM, and EN compliance, backed by SGS/TUV certifications.
  3. Customization: Tailored sch 40 stainless steel pipe dimensions and surface finishes for unique projects.
  4. Global Inventory: 10,000+ tons in stock, ready for stainless steel chimney pipe and industrial projects.
  5. Sustainability: 100% recyclable with 50+ year lifespans, reducing environmental impact.
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