304 VS 316 Stainless Steel Seamless Pipe
Products Description
304 VS 316 Stainless Steel Seamless pipe
Specification Parameter | 304 Stainless Steel Seamless Pipe | 316L Stainless Steel Seamless Pipe |
Outer Diameter (OD) | 6 mm - 830 mm (Φ6-Φ830) | 6 mm - 1220 mm (Φ6-Φ1220) |
Wall Thickness | 0.5mm -60mm | 1 mm - 50mm |
Length Options | 4,000 mm, 5,800 mm, 6,000 mm, 12,000mm or custom | 4,000 mm, 6,000 mm, 12,000mm or custom |
Tolerance (OD) | ±0.5% (min ±0.10 mm) - per D4 grade (GB/T 14976) | ±0.5% (min ±0.10 mm) - per D4 grade (ASTM A312) |
Tolerance (Wall Thickness) | ± 10% | ± 10% |
Surface Finish | Polished, Annealed, Pickled, Bright | Polished, Annealed, Pickled, Bright |
Manufacturing Process | Hot rolled, Cold drawn | Hot rolled, Cold drawn |
Common Standards | ASTM A312, A213, GB/T 14976, JIS G3459 | ASTM A312, A213, GB/T 14976, ASME BPE, EN 10216 |
Pressure Rating (SCH) | SCH 5S-XXS (up to 1500 psi for small diameters) | SCH 5S-XXS (up to 2500 psi for small diameters) |
Theoretical Weight Formula | (OD - Wall Thickness) × Wall Thickness × 0.02491 = kg/m | (OD - Wall Thickness) × Wall Thickness × 0.02491 = kg/m |
Price Comparison
304 VS 316 Stainless Steel Seamless pipe
Parameter | 304 Stainless Steel Seamless Pipe | 316L Stainless Steel Seamless Pipe |
Base Price (per ton) | ¥ 15,200 - ¥ 19,300 | ¥ 27,200 - ¥ 31,700 |
Price Driver | Chromium + Nickel (no molybdenum) | High-cost molybdenum (2-3%) inclusion |
Market Volatility | Moderate (linked to Ni prices) | High (Mo prices are unstable and scarce) |
Cost Premium | - | +70% to +80% higher than 304 |
Regional Variation | ±¥1,000 (due to logistics & local supply) | ±¥1,500 (limited production capacity) |
Performance Comparison
304 VS 316 Stainless Steel Seamless pipe
Performance Aspect | 304 Stainless Steel | 316L Stainless Steel |
Corrosion Resistance | Good in mild environments | Excellent in chloride-rich conditions (e.g., seawater, de-icing salts) |
Pitting Resistance | Moderate (susceptible to rust in salt air) | High (PREN > 24) due to Mo addition |
High-Temperature Strength | Stable up to ~800°C | Superior stability above 800°C |
Weldability | Excellent (low carbon variants like 304L) | Excellent (316L designed for welding) |
Mechanical Strength | Tensile ≥ 515 MPa, Elongation ≥ 40% | Similar tensile, but better creep resistance |
Hygiene & Biocompatibility | Widely used in food processing | Preferred for medical devices & implants |
Chemical Composition Comparison
Element | 304 Stainless Steel | 316L Stainless Steel |
Chromium (Cr) | 18% | 16-17% |
Nickel (Ni) | 8-10.5 percent | 10-14% |
Molybdenum (Mo) | 0% | 2-3% (key differentiator) |
Carbon (C) | ≤ 0.08% (≤ 0.03% for 304L) | ≤ 0.03% (low carbon for welding stability) |
Iron (Fe) | Balance | Balance |
Other Elements | Mn, Si, N (trace) | Mn, Si, N, Cu (trace) |
Application & Use Case Comparison
Application Field | 304 Stainless Steel | 316L Stainless Steel |
Architecture & Decoration | Railings, facades, indoor fixtures | Coastal buildings, seaside structures |
Food & Beverage | Tanks, pipelines, kitchenware | High-sanitation processing lines |
Medical Devices | General equipment | Surgical tools, implants, lab instruments |
Marine & Offshore | Not recommended | Ship components, offshore platforms |
Chemical Processing | Mild chemical handling | Acid tanks, reactors, chlorinated systems |
Water Systems | Freshwater pipes | Seawater desalination, brine handling |
Energy & Power | General support structures | Heat exchangers, boiler tubes in harsh zones |
Advantage Comparison
Feature | 304-Focused Suppliers | 316L-Capable Suppliers |
Production Scale | Large-scale, high-volume output | Smaller batches, specialized lines |
Certifications | ISO 9001, basic material traceability | ISO 9001, ASTM/ASME, full material certs |
Customization | Standard sizes, fast delivery | Custom alloys, non-standard dimensions |
Regional Strength | Domestic China, Southeast Asia | Global exports (Middle East, Europe, NA) |
Value Proposition | Low cost, fast turnaround | High reliability, long-term performance |
Export Project Suitability Comparison
Project Type | 304 Suitability | 316L Suitability |
Middle East Desalination Plants | Low (fails in saline environment) | High (standard material) |
Southeast Asia Coastal Infrastructure | Moderate (short-term use) | High (long-term corrosion resistance) |
European Food Processing Lines | High (EU-compliant hygiene) | Also high, but overkill for non-corrosive use |
North American Medical Equipment | Acceptable for external parts | Preferred for implantable/contact parts |
African Municipal Water Projects | High (cost-effective, adequate life) | Overqualified, too expensive |
Arctic Industrial Piping | Limited (cold brittleness risk) | Better performance in extreme cold corrosion mix |
Pipe photos
