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Stainless Steel Pipe | 304L/316L Eco-Friendly Recycled Tubes
Stainless Steel Pipe | 304L/316L Eco-Friendly Recycled Tubes
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Stainless Steel Pipe | 304L/316L Eco-Friendly Recycled Tubes
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, ISO 14001, 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 | Electropolished, Satin Finish |
| Tolerance | OD ±0.1%, WT ±10% | OD ±0.1%, WT ±10% |
| Recycled Content | ≥85% | ≥80% |
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 high-pressure and high-temperature environments like 8 inch stainless steel stove pipe systems. The elongation (≥40%) allows seamless bending into complex layouts without cracking. For 304 stainless steel exhaust pipe applications, these grades maintain stability at temperatures up to 870°C, resisting deformation in industrial furnaces and automotive exhausts. The addition of molybdenum in 316L enhances resistance to chloride-induced stress corrosion cracking (SCC), making it ideal for coastal or marine environments.
Weight Calculation Formula
Weight per meter (kg/m) = (OD – Wall Thickness) × Wall Thickness × 0.0248
Example: A 2.5 inch stainless steel exhaust pipe (OD 63.5 mm, thickness 1.5 mm):
Weight = (63.5 – 1.5) × 1.5 × 0.0248 ≈ 2.3 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.
- Recycled content percentage and ISO 14001 certification code.
Why Does Stainless Steel Rust?
Despite their corrosion resistance, rust can occur under extreme conditions:
- Chloride exposure: Prolonged contact with seawater (>500 ppm chloride) or de-icing salts degrades the passive chromium oxide layer.
- Mechanical damage: Scratches from abrasive tools or improper handling expose unprotected metal to oxidation.
- Galvanic corrosion: Direct contact with carbon steel in humid environments accelerates rust formation.
- High-temperature oxidation: Sustained use above 870°C causes scaling in non-annealed pipes.
Manufacturing & Sustainability
Processes:
- Cold drawing: Enhances dimensional precision for 304 stainless steel exhaust pipe applications.
- TIG welding: Seamless joints for high-pressure systems.
- Solution annealing: Heated to 1,040–1,100°C to eliminate carbide precipitation during welding.
Eco-Friendly Features:
- Recycled material: 80–85% of raw material sourced from post-industrial scrap.
- Low-carbon production: Energy-efficient furnaces reduce CO₂ emissions by 30% compared to conventional methods.
- Zero-waste policy: 99% of manufacturing byproducts (e.g., slag, metal dust) are recycled.
Applications
- Industrial exhausts: High-temperature 8 inch stainless steel stove pipe for chemical plants.
- Automotive systems: Corrosion-resistant 2.5 inch stainless steel exhaust pipe for performance vehicles.
- Renewable energy: SCH 10S pipes for geothermal and solar thermal systems.
Why Choose Our 304L/316L Stainless Steel Pipes?
- Material Integrity: Full traceability with EN 10204 3.1 Mill Test Certificates and third-party SGS/BV inspections.
- Custom Solutions: Tailored 304 stainless steel exhaust pipe and SCH 40S variants for ASTM/ASME compliance.
- Global Inventory: 5,000+ tons of ready stock, including 8 inch stainless steel stove pipe and SCH 5S–160 schedules.
- Technical Support: 24/7 engineering guidance on welding, cutting, and corrosion prevention.
- Sustainability: 100% recyclable material with ISO 14001-certified production and carbon-neutral shipping options.
