Liga 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
| Elemento | Ni | Cr | Mo | Fe | C | Mn | Si | P | S | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| Content (%) | Equilíbrio | 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
- PT: 2.4605
- ASTM: B622 (seamless pipes), B626 (welded pipes)
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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: Liga 59 boosts durability in extreme settings.
Mechanical Properties of Alloy 59
| Propriedade | Tensile Strength (Rm) | Yield Strength (Rp0.2) | Elongation (A) | Hardness (HB) |
|---|---|---|---|---|
| Valor | ≥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.
- Tratamento térmico: 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.
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