Hey, if you’re in the chlor-alkali business, you already know the pain. Those massive evaporators run day and night turning dilute brine into 50% or 73% caustic soda, and the equipment takes a beating. That’s exactly why we at DLX Company pour everything into making top-tier Nickel 200 seamless tubes. These aren’t just pipes—they’re the backbone that keeps your plant producing high-purity caustic without constant shutdowns for repairs.
Let’s start with what makes our Nickel 200 seamless tube special. It’s 99% pure nickel, cold-worked and annealed to perfection under ASTM B161 specs. No welds, no seams, just one continuous piece of metal that laughs at hot, concentrated sodium hydroxide. The secret is that protective nickel oxide layer that forms instantly and keeps repairing itself. In real evaporator service, corrosion stays ridiculously low—under one mil per year—even when temperatures hit 150°C and concentrations climb past 50%. Compare that to other materials and you’ll see why plants keep coming back to us.
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Now, the chlor-alkali industry is changing fast, and our tubes are right there keeping up. Global demand is climbing at around 4–4.75% CAGR, heading toward an $80–88 billion market by the early 2030s. Membrane-cell technology is taking over because it uses less power and produces cleaner caustic with fewer impurities. That’s great for the environment and your bottom line, but it also means evaporators run hotter and longer. Older diaphragm and mercury cells are being retired, and new high-efficiency lines need materials that won’t crack or corrode under the new conditions. Nickel 200 seamless tubes deliver exactly that reliability.
Think about a typical multiple-effect evaporator setup. You’ve got falling-film or forced-circulation units concentrating caustic from 10–12% all the way to 50% or higher. Our tubes go into the heater bundles, tube sheets, and piping where they see constant flow, boiling, and occasional chlorate spikes. Because they resist both general corrosion and stress-corrosion cracking, you get years of steady operation. One customer told us their previous tubes lasted maybe three seasons before pitting forced a retube. After switching to DLX Nickel 200, they’re on year seven and still going strong. That kind of longevity translates straight into saved downtime and lower total cost of ownership.
Chemical Composition
| Grade | Nickel (Ni)+ Cobalt (Co) | Copper (Cu) | Silicon (Si) | Manganese (Mn) | Carbon (C) | Magnesium (Mg) | Sulfur (S) | Phosphorus (P) | Iron (Fe) |
| 99.9% | ≤0.015 | ≤0.03 | ≤0.002 | ≤0.01 | ≤0.01 | ≤0.001 | ≤0.001 | ≤0.04 | |
| 99.6% | 0.1 | 0.1 | 0.05 | 0.1 | 0.1 | 0.005 | 0.002 | 0.1 |
Physical & Mechanical Properties
| Grades | N4/Ni201 | N6/Ni200 |
| Density | 8.9g/cm³ | 8.9g/cm³ |
| Melting Point | 1455°C | 1445-1470℃ |
| Coefficient of Thermal Expansion | 13.0µm/m·°C | 13.3×10⁻⁶/℃ |
| Thermal Conductivity | 10.1W/m·K | 90.7 W/m·K |
| Electrical Resistivity | 0.103×10⁻⁶Ω·/m (at 20℃) | |
| Electrical Conductivity | 14.6% IACS | |
| Tensile Strength | ≥450MPa | ≥450 MPa |
| Yield Strength | ≥200MPa | ≥150 MPa |
| Elongation at Break | ≥40% | ≥40% |
| Hardness | ≤150 |
Applications go beyond just evaporators, too. You’ll find our tubes in salt settlers, caustic storage and transfer lines, heat exchangers for brine preheating, and even anhydrous caustic finishing units. In membrane plants, where purity specs are tighter than ever, the minimal nickel pickup from our tubes keeps your product on-spec without extra polishing steps. And because nickel has excellent thermal conductivity, heat moves faster through the tube wall, so your evaporators run more efficiently and use less steam. Small gains there add up to big energy savings over a year.
What really sets DLX apart in the market is how we make these tubes. We start with high-purity nickel ingots and control every step of the cold-drawing and annealing process in-house. That gives us tighter wall-thickness tolerances and smoother internal surfaces than the industry average. Less roughness means less fouling, easier cleaning, and better flow. Every batch gets ultrasonic testing, hydrostatic pressure checks, and full chemical analysis so you know exactly what you’re installing. We also offer custom lengths, U-bends, and special finishes to match your exact evaporator design—no more cutting and welding on site.
Comparison Parameter Table
| Parameter | DLX Nickel 200 Seamless Tube | Typical Austenitic Stainless Steel Tubes (316L equivalents) |
|---|---|---|
| Nickel Content | 99.0% min | 10–14% |
| Corrosion Rate in 50% NaOH @ 150°C | <0.025 mm/y (<1 mpy) | 0.1–0.5 mm/y + pitting/SCC risk |
| Max Recommended Temp in Caustic | Up to 315°C ( Nickel 201 variant) | ~150°C before SCC risk |
| Thermal Conductivity | ~70 W/m·K | ~16 W/m·K |
| Tensile Strength (annealed) | 380–520 MPa min | 515–620 MPa |
| Yield Strength (0.2% offset) | 105 MPa min | ~205 MPa |
| Resistance to Caustic SCC | Excellent – immune up to 290°C | Susceptible above 150°C |
| Heat Transfer Efficiency | Superior | Moderate |
| Product Purity Impact | Minimal nickel pickup | Higher risk of iron/chromium contamination |
| Typical Service Life in Evaporators | 5–12+ years | 1–4 years |
When you compare us to other suppliers, you’ll notice the difference in the details. Many tubes on the market meet the minimum ASTM requirements, but ours consistently hit the upper end of mechanical properties while staying well below corrosion limits in plant trials. Our customers report 20–30% longer service intervals and far fewer unexpected leaks. That reliability matters when a single evaporator outage can cost tens of thousands per day. Plus, we back every order with technical support from engineers who’ve spent years in chlor-alkali plants. Need help picking the right schedule or calculating expected life under your exact chlorate levels? We’ve got the data and the experience.
Looking ahead, the industry trends all point toward more Nickel 200 use. Asia is adding millions of tons of new capacity, Europe is pushing hard on sustainability and zero-liquid-discharge, and North America is upgrading older plants to membrane tech. All of these moves increase the need for proven, high-temperature caustic-resistant tubing. At the same time, tighter environmental rules mean plants can’t afford leaks or frequent replacements that generate waste. Our tubes help you meet those goals while keeping production humming.
We also make sure the supply chain works for you. Whether you need a few hundred feet for a repair or thousands of meters for a new build, DLX has the inventory and production capacity to deliver on time. We’ve invested in modern drawing benches and annealing furnaces so lead times stay short even when the market heats up.
Bottom line: if you want caustic soda evaporators and chlor-alkali systems that just work—year after year, through temperature swings, concentration changes, and whatever the process throws at them—DLX Nickel 200 seamless tubes are the smart choice. We’ve helped plants across the globe cut maintenance budgets, boost output, and sleep better at night knowing their critical equipment is protected by the best material for the job.
Ready to talk about your next project? Drop us your specs and let’s build something that lasts. At DLX, we don’t just supply tube—we help keep your plant profitable and reliable for the long haul.
For more details, pls directly contact us.
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.
For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
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1. What exactly is Nickel 200 and why is it the go-to material for seamless tubes in caustic soda evaporators?Nickel 200 is commercially pure wrought nickel (99.0% min Ni + Co) with very low carbon and impurities. At DLX, we cold-draw it into seamless tubes that form a tough, self-healing nickel oxide film in hot caustic environments. This film shrugs off attack even in boiling 50% NaOH or higher concentrations, keeping product purity high and equipment running for years without contamination.
2. How does Nickel 200 handle the aggressive conditions inside chlor-alkali plants?In chlor-alkali production, you’re dealing with hot, concentrated NaOH mixed with chlorides and chlorates. Our Nickel 200 seamless tubes resist general corrosion at rates under 0.025 mm/year (1 mpy) up to 73% caustic and stay immune to stress-corrosion cracking up to about 290°C (550°F). That’s why they’re standard for evaporator tubing, tube sheets, and circulation piping—downtime drops dramatically compared to less resistant materials.
3. What are the key mechanical properties of DLX Nickel 200 seamless tubes?Annealed condition gives minimum tensile strength of 380 MPa (55 ksi), yield strength 105 MPa (15 ksi), and elongation 40% minimum. The tubes stay ductile at cryogenic temps and hold good strength up to 315°C. High thermal conductivity (around 70 W/m·K) makes heat transfer in evaporators super efficient, while the seamless construction eliminates weld seams that could become weak points.
4. What temperature and concentration limits can these tubes actually take in real-world caustic service?You can run them confidently in 50% caustic at evaporator temperatures around 150°C, all the way up to 73% and even anhydrous caustic with Nickel 201 variant above 315°C. Corrosion stays negligible; the only thing that speeds it up is high chlorate levels (we help customers manage that with proper process controls). Field data from chlor-alkali plants shows service life of 5–12 years depending on operating conditions.
5. How does Nickel 200 compare to typical stainless steel tubes in caustic soda duty?Stainless options like 316L start pitting and cracking in hot concentrated caustic above 150°C, with corrosion rates jumping 10x or more. Nickel 200 keeps rates under 1 mpy and shows zero SCC risk in the same service. Plus, our tubes transfer heat better and maintain product purity—huge wins for evaporator efficiency and downstream product quality.
6. What industry trends are driving more demand for Nickel 200 seamless tubes right now?The global chlor-alkali market is growing at about 4% CAGR toward $80+ billion by 2032, with massive shifts to membrane-cell technology for lower energy use and cleaner caustic. That means higher operating temperatures and tighter purity specs—exactly where our Nickel 200 tubes shine. Asia’s capacity boom and stricter environmental rules are pushing plants to replace aging equipment with longer-lasting, corrosion-proof solutions like ours.
7. Are there special fabrication or installation tips for these tubes?They fabricate just like mild steel but need a bit more force for cold forming. We recommend annealing at 705–925°C in a reducing atmosphere after heavy work. For evaporator tube sheets, our tubes expand beautifully without cracking. At DLX we supply them in exact lengths with tight OD/ID tolerances per ASTM B161 so installation is fast and leak-free.
8. Why should I choose DLX Company for my Nickel 200 seamless tubes?Because we don’t just sell tube—we deliver peace of mind. Our material meets or exceeds ASTM B161 with extra cleanliness checks, tighter tolerances, and full traceability. Customers tell us our tubes last longer, foul less, and cut maintenance costs. Plus, we offer fast custom quotes, technical support from people who actually understand chlor-alkali plants, and reliable global delivery.
