Alloy 59 (UNS N06059) is an ultra-low carbon nickel-chromium-molybdenum alloy, showcasing top-tier corrosion resistance. It thrives in harsh acids and high-temperature halides. Thus, Alloy 59 stands out as the go-to choice for stainless steel pipes and fittings in chemical and marine industries.
Chemical Composition of Alloy 59
| Element | Ni | Cr | Mo | Fe | C | Mn | Si | P | S | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| Content (%) | Balance | 22.0-24.0 | 15.0-16.5 | ≤1.5 | ≤0.01 | ≤0.5 | ≤0.1 | ≤0.015 | ≤0.005 | 0.1-0.4 |
Core Advantages of Alloy 59
PRE value hits 75, perfect for acidic stainless steel pipes.
No preheating needed, cutting costs for pipe fittings.
≥690 MPa tensile strength, ≥40% elongation ensure pipe safety.
Performs well in high heat, ideal for heat exchanger pipes.
High durability lowers maintenance for stainless steel systems.
Standards of Alloy 59
- UNS: N06059
- EN: 2.4605
- ASTM: B622 (seamless pipes), B626 (welded pipes)
What We Do
KAYSUNS provides a package solutions for piping materials such PIPES, FITTINGS, FLANGES, VALVES in stainless steel, duplex steel and alloy steel etc. We will customize the most suitable products for you. If you have any questions about our company and products, please feel free to contact us.
Applications of Alloy 59
- Chemical Gear: PTA reactors last 15 years in bromide-rich acetic acid.
- Environmental Use: Scrubbers resist pH 0.5-2 acidic condensate.
- Marine Systems: Deep-sea pipes stay tough at 3000m depth.
- Stainless Steel Pipes and Fittings: Alloy 59 boosts durability in extreme settings.
Mechanical Properties of Alloy 59
| Property | Tensile Strength (Rm) | Yield Strength (Rp0.2) | Elongation (A) | Hardness (HB) |
|---|---|---|---|---|
| Value | ≥690 MPa | ≥310 MPa | ≥40% | ≤230 |
Processing Features
- Hot Forming: Use 1050-1200°C, with 1150°C ideal for rolling.
- Cold Working: Hardening coefficient n=0.35 outperforms similar alloys.
- Heat Treatment: Quench at 1120-1170°C for solid solution.
Phase Composition Features
- Matrix: Single-phase austenite avoids intermetallic precipitation risks.
- Corrosion Shield: Cr₂O₃/MoO₃ film stays stable from pH 0 to 14.
- PRE Value: 71-75, surpassing industry-leading alloys.
Corrosion Resistance in Extreme Conditions
- Hydrochloric Acid: Corrosion rate stays below 0.1 mm/a at 40°C, 40% concentration.
- Sulfuric Acid: Rate drops to 0.03-0.05 mm/a at 80°C, 93-98% concentration.
- Chlorides: Pitting temperature exceeds 100°C, with crevice corrosion CL=85.
Welding Techniques
- Top Method: GTAW with ERNiCrMo-13 wire works best.
- Key Tips:
- Keep interpass temperature below 150°C.
- Skip preheating and post-weld treatment.
- Use argon shielding, oxygen below 50ppm.
Alloy 59 VS. Competitors
| Alloy | PRE Value | CPT (°C) | CL | Tensile Strength (MPa) |
|---|---|---|---|---|
| Alloy 59 | 71-75 | >100 | 85 | ≥690 |
| Alloy 625 | 50 | 80 | 60 | ≥760 |
| Alloy C276 | 69 | 90 | 75 | ≥690 |
| 316L | 24 | 20 | 10 | ≥485 |
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