Yes, Alloy C-2000 tubes can be used in seawater applications as they resist crevice corrosion in seawater effectively at 29°C in still and flowing conditions.
ASTM B622 Alloy C2000 Seamless Tube Manufacturer in China
We are Zhejiang Xintongda Special Steel (XTD), a reliable Alloy C2000 Seamless Tube manufacturer in China and a global supplier. This tube, also known as UNS N06200 tube, is a high-performance, nickel-chromium-molybdenum alloy. It has a unique chemistry of 22.00–24.00% chromium, 15.00–17.00% molybdenum, and 1.6% copper with strictly controlled carbon (≤0.010%) and silicon (≤0.08%). We manufacture this tube using advanced seamless forming and solution annealing processes in compliance with the ASTM B622 standards. Its deliberate copper addition provides superior resistance to reducing acids. This makes it a preferred choice in mixed acid environments when compared to standard grades such as C276. Alloy C2000 tube offers improved protection against oxidising chemicals and stress corrosion cracking, which makes it ideal for chemical processing and other corrosive service environments. With multiple international certifications, we subject every batch to strict quality checks. We have an annual supply capacity of 25,000 tons and deliver stock orders within a week.
As a trusted Alloy C2000 seamless tube supplier, we ensure our tubes meet the following specifications:
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Standard ASTM B622 -
OD Range 6-457 mm 
Thickness 1-65 mm -
Length ≤ 22 m
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Technical Data
Technical Data
Alloy C-2000 Seamless Tube Manufacturing Process
The manufacturing process of C2000 seamless nickel alloy tube begins by heating a high-quality solid billet before hot extruded it to create a hollow shell. This shell is cold drawn and pilgered multiple times to get the precise size and a smooth finish. To restore its corrosion resistance, the tube is solution-annealed and water-quenched. Visit here to learn in detail about the manufacturing process of these tubes.
What are the key Features of Alloy C2000 Tubes?
Alloy C2000 tubes have 4 main characteristics. These include high-chromium protection, strong oxidising resistance, superior SCC & pitting resistance, and broad corrosion resistance. Each feature is explained below in detail.
- Strong oxidising resistance: The tube contains chromium, which creates a stable protective film on the surface. This high chromium level allows the tube to withstand strong oxidising environments better than most other nickel alloys.
- High-chromium protection: The high-chromium content of the tube not only provides strong oxidation resistance, but also solid solution strengthening. It contributes to the overall strength and hardness of the alloy, improving its mechanical properties.
- Superior SCC & Pitting Resistance: The high molybdenum and nickel content of the C2000 tube helps it resist stress corrosion cracking and localised pitting. These elements ensure the tube does not develop deep holes or cracks in stagnant, chloride-rich water.
- Broad Corrosion Resistance: By adding copper to the nickel-chromium-molybdenum system, the alloy resists both oxidising and reducing acids. This makes the tube a versatile choice for plants that handle a wide variety of different chemicals.
ASTM B622 UNS N06200 Nickel Alloy Seamless Tube Tolerance
The table below outlines the standard dimensional tolerances for Alloy C2000 tubes as specified by the ASTM B622 standard.
| Standard | OD (D) mm | OD Tolerance (mm) | Thickness Condition | Thickness Tolerance | Length | Length Tolerance |
| ASTM B622 (Cold-worked Tube) |
D≤10 | ±0.13 | S (Ave) | ±15% | Random / Cut Length |
OD≤50.8 : +3.2 / 0 OD≥50.8 : +4.8 / 0 Details refer to B829 |
| 10<D≤16 | ±0.13 | S (Ave) | ±10% | |||
| 16<D≤38 | ±0.19 | S (Ave) | ±10% | |||
| 38<D≤76 | ±0.25 | S (Ave) | ±12.5% | |||
| 76<D≤114 | ±0.38 | S (Ave) | ±12.5% | |||
| 114<D≤168 | ±0.51 | S (Ave) | ±15% |
C2000 Seamless Nickel Alloy Tube Equivalent Material
The equivalent designation of C2000 seamless nickel alloy tube is UNS N06200. It is also known as Werkstoff Nr. 2.4675. The other global equivalents are explained in the table below.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Alloy C2000 | N06200 | — | — | — | — | 2.4675 | — |
What is the difference between Alloy C2000 and C276 Tubes?
The main difference between Alloy C2000 and C276 tubes is that C2000 has more copper in it. This Ni-Cr-Mo-Cu balance makes it better at resisting reducing acids like sulfuric acid. C276 is a standard for many industries, but C2000 is more versatile when it comes to mixed acid environments.
| Alloy C2000 (UNS N06200) | Alloy C276 (UNS N10276) | |
|
Chemical Composition |
Ni-Cr-Mo + Copper. Contains 22-24% Chromium and 1.6% Copper. |
Ni-Cr-Mo + Tungsten. Contains ~16% Chromium and ~4% Tungsten. |
|
Environmental Versatility |
Dual-Resistance: Highly versatile; offers broad corrosion resistance across both oxidising and reducing environments. |
Reducing Specialty: Best known for resisting reducing agents and aggressive chlorides. |
|
Core Performance Strengths |
Exceptional resistance to Sulfuric Acid (due to copper) and localised corrosion (pitting/crevice). |
Superior resistance to pitting and stress-corrosion cracking in chloride-rich media. |
|
Acidic Resistance Focus |
Excels in Hydrofluoric, Sulfuric, and Hydrochloric acids across wide temperature ranges. |
Primarily used for Ferric/Cupric chlorides, wet chlorine gas,organic/inorganic contaminated media, and reducing acids (HCl, H₂SO₄), especially at high temperatures. |
|
Primary Industrial Use |
Chemical reactors, heat exchangers for mixed-acid processes, and sulfuric acid plants. |
Pollution control (stack liners), pulp & paper bleaching, and marine environments. |
|
Thermal & Weld Stability |
Excellent; resists grain boundary precipitation, meaning no post-weld heat treatment is needed. |
High stability; designed to minimise carbide precipitation during welding to maintain corrosion resistance. |
|
Mechanical Strength |
Slightly higher tensile strength (approx. 690-760 MPa) and better ductility (40-45% elongation). |
Standard high-strength superalloy (approx. 655-700 MPa) with 30-40% elongation. |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
What Industries Commonly use Alloy C2000 Tubes?
Alloy C2000 tubing is commonly used in 5 demanding industries. These include:
Desalination Plants
This tube handles high-pressure salt water and concentrated brine without corroding. It is used in heat exchangers to convert seawater into fresh drinking water safely.
Furnaces and Gas Turbines
The Alloy C2000 tube is used in structural components that face extreme heat. It resists carburisation and oxidation. This ensures the equipment lasts longer in high-temperature environments.
Chemical Processing
This tube is used to move strong acids and chlorides in reaction vessels and piping systems. When working with complex chemical mixtures the tube prevents leaks and equipment from breakdowns.
Marine Engineering
Ships and offshore platforms use DIN 2.4675 tube for hardware exposed to constant salt spray and submerged conditions. It prevents the rapid metal loss usually caused by the harsh oceanic environment.
Nuclear Power Plants
The tube is used in cooling systems and waste handling areas where high reliability is mandatory. It provides a safe barrier against corrosive fluids used in the power generation cycle.
Frequently Asked Questions
-
Can Alloy C-2000 Tube be used in seawater applications?
-
What standards apply to Alloy C2000 tubes?ASTM B622 standards apply to Alloy C2000 tubes.
- Alloy C-2000 Seamless Tube Manufacturing Process
- What are the key Features of Alloy C2000 Tubes?
- ASTM B622 UNS N06200 Nickel Alloy Seamless Tube Tolerance
- C2000 Seamless Nickel Alloy Tube Equivalent Material
- What is the difference between Alloy C2000 and C276 Tubes?
- 100% Certified Testing & Documentation
- What Industries Commonly use Alloy C2000 Tubes?
- Frequently Asked Questions