1 1

StockSteel

Stainless Steel Pipe | 304L/316L HVAC Ducting Solutions

Stainless Steel Pipe | 304L/316L HVAC Ducting Solutions

$1,760.00 SGD
$1,760.00 SGD
Sale Sold out
Taxes included. Shipping calculated at checkout.
Quantity
Thickness

Stainless Steel Pipe | 304L/316L HVAC Ducting Solutions

Product Specifications

Material Grades: 304L (UNS S30403) / 316L (UNS S31603)
Standards: ASTM A312 (seamless/welded), ASTM A554 (architectural tubing), ASME B36.19
Certifications: ISO 9001, PED 2014/68/EU, TÜV

Property 304L 316L
Outer Diameter (OD) 12.7 mm – 610 mm 12.7 mm – 610 mm
Wall Thickness 0.5 mm – 12.7 mm 0.5 mm – 12.7 mm
Hardness (Rockwell B) ≤90 HRB ≤95 HRB
Hardness (Vickers) ≤200 HV ≤220 HV
Surface Finish Annealed, Pickled, Mirror Polish Annealed, Electropolished
Tolerance OD ±0.1%, WT ±10% OD ±0.1%, WT ±10%

Technical Attributes

Tensile & Bend Strength

304L and 316L stainless steel pipes exhibit tensile strengths of ≥485 MPa and yield strengths of ≥170 MPa, ensuring structural integrity in HVAC systems under high airflow pressure and thermal cycling. Their ductility (≥40% elongation) allows bending into complex duct layouts without cracking, critical for custom HVAC installations. For stainless steel schedule 40 pipe applications, these grades maintain dimensional stability at temperatures up to 870°C, making them ideal for industrial exhaust systems.

 

Weight Calculation Formula

Weight per meter (kg/m) = (OD – Wall Thickness) × Wall Thickness × 0.0248
Example: A stainless steel schedule 40 pipe with OD 114.3 mm (4 inches) and thickness 6.02 mm:
Weight = (114.3 – 6.02) × 6.02 × 0.0248 ≈ 16.3 kg/m.

 

Identification Marking

All pipes are laser-etched with:

  • ASTM/ASME standard (e.g., ASTM A312).
  • Grade (304L/316L), OD, thickness, heat number, and manufacturer’s logo.
  • Traceability codes compliant with EN 10204 3.1 standards.

Why Does Stainless Steel Rust?

Although 316L offers superior corrosion resistance due to 2-3% molybdenum, both grades may corrode under extreme conditions:

  1. Chloride exposure: Prolonged contact with coastal air (>500 ppm chloride) or de-icing salts degrades the passive chromium oxide layer.
  2. Mechanical damage: Improper use of stainless steel pipe tape during installation or abrasive cutting tools exposes unprotected metal to oxidation.
  3. Galvanic corrosion: Direct contact with carbon steel or copper in humid environments accelerates rust formation.

Manufacturing & Customization

Processes:

  • Cold drawing: Enhances surface smoothness (Ra ≤0.5 μm) for HVAC airflow efficiency.
  • TIG welding: Seamless joints for stainless steel seamless pipe systems in high-pressure ducts.
  • Solution annealing: Heated to 1,040–1,100°C to eliminate carbide precipitation during welding.

Custom Options:

  • Threading: NPT or BSPT threads for secure connections using stainless steel pipe tape.
  • Sizing: Stainless steel schedule 40 pipe available in SCH 5S to SCH 160 for variable pressure requirements.

Applications

  • HVAC ducting: Corrosion-resistant airflow systems for commercial buildings.
  • Industrial exhausts: High-temperature stainless steel seamless pipe for fume extraction.
  • Sanitary ventilation: Electropolished 316L pipes for pharmaceutical cleanrooms.

Why Choose Our Stainless Steel Pipes?

  1. Material Integrity: Full traceability with Mill Test Certificates (EN 10204 3.1) and third-party SGS/BV inspections.
  2. Custom Solutions: Tailored stainless steel schedule 40 pipe and seamless variants for ASTM/ASME compliance.
  3. Global Inventory: 5,000+ tons of ready stock, including SCH 10S to 160XXS schedules.
  4. Technical Support: 24/7 guidance on welding, cutting, and corrosion prevention.
  5. Sustainability: 100% recyclable material with ISO 14001-certified production.
View full details