UNS S44660 Ferritic Stainless Steel Seamless Pipe
Grade: UNS S44660
Dimension: OD 12.7 - 1422mm, WT 1 - 45mm, Length: 5 - 12m
Type: Seamless and Welded.
UNS S44660 is a premium super ferritic stainless steel that delivers exceptional chloride and acid resistance at a fraction of duplex steel costs. With 30% chromium and 4% molybdenum, this UNS S44660 Ferritic Stainless Steel Seamless Pipe outperforms 316L by 8-10x in harsh environments like seawater and chemical processing.
Key Advantages:
✔ Zero nickel - Eliminates stress corrosion cracking risk
✔ Seamless construction - Ideal for high-pressure systems
✔ Cost-effective - 50% cheaper than super duplex alternatives
✔ Easy fabrication - Excellent weldability and machinability
Pro Tip: When 316L fails but duplex is overkill - S44660 is the perfect balance!
Specifications & Dimensions
| Parameter | Range | Tolerance |
|---|---|---|
| Outer Diameter | 6mm - 600mm | ±0.1mm (<50mm) |
| Wall Thickness | SCH10S - SCH80 | ±10% |
| Length | 3m - 12m | +100mm/-0mm |
| Surface Finish | Pickled/Passivated/EP | Ra≤0.8μm (EP) |
Standards Compliance:
ASTM A268
ASME SA268
EN 10216-5
Chemical Composition of UNS S44660 Ferritic Stainless Steel Seamless Pipe
| Element | Content (%) | Role |
|---|---|---|
| Cr | 28.0 - 30.0 | Corrosion resistance |
| Mo | 3.5 - 4.2 | Pitting resistance |
| Nb | 0.3 - 0.5 | Stabilizes welds |
| C | ≤0.025 | Prevents sensitization |
| N | ≤0.035 | Strength enhancement |
Key Metric:
PREN ≥42 (Cr + 3.3Mo + 16N) - Better than 6Mo alloys!
Mechanical Properties of UNS S44660 Ferritic Stainless Steel Seamless Pipe
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength | ≥620 MPa | ASTM A370 |
| Yield Strength | ≥450 MPa | ASTM A370 |
| Elongation | ≥20% | ASTM A370 |
| Hardness | ≤95 HRB | ASTM E18 |
| Impact Toughness | ≥40J @ -20°C | ASTM A370 |
Real-World Performance:
0.002 mm/year corrosion in 10% HCl
15+ years of service in seawater environments
Applications
1. Marine & Offshore
Seawater piping systems
Desalination plant high-pressure lines
2. Chemical Processing
HCl and H₂SO₄ storage tanks
Bleach plant equipment
3. Energy Sector
Flue gas desulfurization (FGD) systems
Geothermal brine handling
4. Specialized Uses
Pharmaceutical CIP systems
Food processing with acidic cleaners
Heat Treatment Process
Critical Steps for Optimal Performance:
- Annealing
Temperature: 790-830°C (1454-1526°F)
Cooling: Rapid air or water quench
- Stress Relieving (for welded components)
Temperature: 595-620°C (1103-1148°F)
Hold Time: 1 hour per 25mm thickness
- Passivation
Nitric acid (20-50% by vol.)
Temperature: 20-50°C (68-122°F)
Note: Improper heat treatment can reduce corrosion resistance by up to 70%!
Fabrication Guidelines
- Welding Best Practices
Filler Metal: ER44660 (AWS A5.9)
Shielding Gas: 98% Ar + 2% N₂
Interpass Temp: <150°C (302°F)
- Machining Tips
Use carbide tools with positive rake
Maintain cutting speeds of 30-50 m/min
Ordering Information
Why Choose Our UNS S44660 Ferritic Stainless Steel Seamless Pipe?
✔ Mill-direct pricing (No middlemen)
✔ Full traceability (Heat number tracking)
✔ Same-day shipping on standard sizes
Special Offer: Order >5 tons and get FREE PMI testing (Value $350)
📞 Contact our materials experts today for a customized solution!
Mob: +86-13772502581
Email: judesteel@juqing.hk
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