Alloy 20 Pipe Manufacturer, Supplier. Contact us to get free quote and sample!
The core value of Alloy 20 pipes in the chemical industry lies in its irreplaceable mixed acid tolerance and excellent economic balance. Especially in the 40-95% sulfuric acid concentration window, it achieves the optimal solution for material cost and life through the golden ratio of copper-molybdenum-niobium. HT PIPE is a Alloy 20 Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!
Alloy N08020 Pipe Applicated in Chemical industry
n08020 material in Sulfuric acid industrial system
- The drying tower circulation pipeline carries 93-98% concentrated sulfuric acid (80-100℃), and the Alloy 20 pipe can suppress the corrosion rate to less than 0.12mm/year through the copper oxide passivation film formed on the surface.
- The heat exchange network of the conversion system faces the challenge of dew point corrosion containing SO₂/SO₃. However, in the temperature range of 120-180℃, the critical corrosion rate of Alloy 20 pipes is 85% lower than that of 316L stainless steel.
uns n08020 astm in PTA (purified terephthalic acid) unit
- In the acid recovery system of acetic acid, in the environment of bromine catalyst (135℃), electrolytic polishing of Alloy 20 pipes (Ra≤0.3μm) can eliminate the enrichment of bromide ions at surface defects, and the corrosion rate is stable at 0.05mm/year.
- The feed unit of the oxidation reactor transports acetic acid-hydrogen bromide mixed medium (pH=1.5). The bimetallic composite pipe (carbon steel outer layer + 3mm Alloy 20 lining) can achieve safe operation at a pressure of 0.8MPa, and the cost is 40% lower than that of the integral alloy pipe.
sch 20 stainless steel pipe in Chlor-alkali production unit
- In the chlorine environment containing trace moisture (0.1%), Alloy 20 is combined with constant potential anode protection (+250mV vs SCE) to increase the upper limit of the operating temperature to 100℃.
- In the sodium hypochlorite circulation system, Alloy 20 welded pipe can maintain a corrosion rate of 0.03mm/year in 15% NaClO solution (60℃). The key is to use 95%Ar+5%N₂ protective gas in the weld area to inhibit the precipitation of σ phase in the heat-affected zone, so that the corrosion resistance of the joint reaches 98% of the parent material.
carpenter 20 steel in Preparation of new energy materials
- Lithium hexafluorophosphate electrolyte pipeline transports organic solutions containing HF. The corrosion rate of Alloy 20 in the LiPF₆-EC/DMC system at 50°C is only 0.08mm/year, and the critical crevice corrosion temperature reaches 85°C.
- The electronic-grade hydrofluoric acid delivery system must meet NAS Class 5 cleanliness. Electrolytically polished Alloy 20 pipeline (EP grade) is combined with automatic orbital welding, and the inner surface roughness Ra≤0.25μm. The particle release is controlled at＞0.2μm particles＜5/mL, which meets the requirements of semiconductor-grade medium transportation.
n08020 alloy in Environmental protection facilities
- The centrifugal casting composite pipe has outstanding anti-erosion and corrosion performance under the conditions of pH=4.5 and Cl⁻=50,000ppm for the flue gas desulfurization (FGD) slurry pipeline. The bend section is lined with a tungsten carbide wear-resistant layer (WC 15%), which reduces the scouring rate from 8mm/year to 0.5mm/year.
- The pickling wastewater treatment system transports mixed acid media containing heavy metals (H₂SO₄ 15%+HNO₃ 5%). The corrosion rate of Alloy 20 pipes in a 50℃ environment is 0.15mm/year.
alloy 20 uns in Organic Chemical Plants
- The fuming sulfuric acid pipeline (containing 25% SO₃) in caprolactam production adopts anode protection technology, and the constant potential is controlled at +0.25V (SCE). The platinum/niobium composite reference electrode is combined with the MMO titanium anode to reduce the corrosion rate from 1.2mm/year (silicon cast iron) to 0.08mm/year.
- In the organic medium containing hydrogen chloride, the Sch40 pipeline is matched with the optimized support spacing design (DN200 pipe support distance 3.8m), and the vibration amplitude is controlled below 30μm. Stress analysis shows that the maximum alternating stress is less than 80MPa, which is far lower than the fatigue limit of 120MPa.
