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1. Material Overview
Nickel 200 (UNS N02200, W.Nr. 2.4066, domestic grade N7) and Nickel 201 (UNS N02201, W.Nr. 2.4068, domestic grade N5) are standard wrought commercially pure nickel alloys. Both grades contain a minimum 99.0% combined nickel and cobalt, manufactured in full compliance with ASTM and ASME pressure equipment specifications. They are globally recognized for exceptional alkaline corrosion resistance, superior thermal and electrical conductivity, and excellent ductility across cryogenic to medium-high temperatures.
The key difference lies in carbon content control:
- Nickel 200 has a standard carbon limit for ambient-temperature service.
- Nickel 201 uses an ultra-low-carbon design to prevent graphitization embrittlement at high temperatures.
Both grades excel in reducing environments, dry halogens, and strong alkaline media, offering far better caustic corrosion resistance than stainless steel and super-austenitic alloys.
- Nickel 200 is rated for continuous service ≤ 315°C, ideal for ambient chemical and electrical components.
- Nickel 201 is approved for long-term operation up to 677°C, making it the primary material for high-temperature caustic, hydrogen reforming, and fluorochemical systems.
We supply a complete range of UNS N02200 and N02201 products, including seamless pipes, forged fittings, anchor flanges, plates, sheets, bars, and custom pressure forgings.
2. Nickel 200 & Nickel 201 Chemical Composition (wt%)
All data strictly follows UNS registration and ASTM B160 / B161 / B162 / B564 standards, ensuring batch stability and industrial consistency.
| Element | Nickel 200 (N02200) | Nickel 201 (N02201) |
|---|---|---|
| Ni+Co (min) | 99.00 | 99.00 |
| C (max) | 0.15 | 0.02 |
| Fe (max) | 0.40 | 0.40 |
| Mn (max) | 0.35 | 0.35 |
| Si (max) | 0.35 | 0.35 |
| Cu (max) | 0.25 | 0.25 |
| S (max) | 0.01 | 0.01 |
Critical Note: The low carbon in UNS N02201 eliminates graphite precipitation, ensuring structural integrity up to 677°C. Trace impurities are tightly controlled to preserve pure nickel’s high conductivity and alkaline resistance.
Alloy 200 & Alloy 201 Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|---|
| Nickel 200 | 8.9 g/cm3 | 1446 °C (2635 °F) | Psi – 67000 , MPa – 462 | Psi – 21500 , MPa – 148 | 45 % |
| Nickel 201 | 8.9 g/cm3 | 1446 °C (2635 °F) | Psi – 67000 , MPa – 462 | Psi – 21500 , MPa – 148 | 45 % |
UNS N02200 & UNS N02201 Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| Nickel 200 | 2.4066 | N02200 | NW 2200 | NA 11 | НП-2 | N-100M | Ni 99.2 |
| Nickel 201 | 2.4068 | N02201 | NW 2201 | NA 12 | НП-2 | – | NLC-Ni 99 |
3. Heat Treatment & Mechanical Properties
3.1 Standard Heat Treatment
Products are delivered in stress-relieved or fully annealed condition at 700–870°C with static air cooling. This removes residual stress, homogenizes grain structure, and maximizes ductility and weldability without harming corrosion resistance. Thick forgings and welded components receive secondary stress relief. Full heat treatment records, PMI reports, and mechanical certifications accompany each batch.
3.2 Room-Temperature Mechanical Properties (Annealed, ASTM Standards)
Nickel 200 (UNS N02200 / N7)
- Tensile Strength: ≥ 380 MPa
- 0.2% Offset Yield Strength: ≥ 145 MPa
- Elongation: ≥ 35%
- Brinell Hardness: ≤ 95 HB
Nickel 201 (UNS N02201 / N5)
- Tensile Strength: ≥ 345 MPa
- 0.2% Offset Yield Strength: ≥ 138 MPa
- Elongation: ≥ 40%
- Brinell Hardness: ≤ 90 HB
3.3 Physical & Service Characteristics
- Density: 8.89 g/cm³
- Mean linear expansion coefficient (20–300°C): 13.3 × 10⁻⁶ /°C
- High electrical and thermal conductivity, stable ferromagnetic properties, excellent cryogenic toughness
- ASME max continuous service temperature: ≤ 315°C (N02200), ≤ 677°C (N02201)
4. Core Performance Advantages
4.1 Superior Alkaline Corrosion Resistance
Forms a dense, self-stabilizing nickel oxide passive film in full-concentration alkaline media. Completely immune to caustic stress corrosion cracking, a common failure in stainless steels. Ideal for chlor-alkali and alkaline concentration industries.
4.2 Reducing & Dry Halogen Resistance
Stable performance in reducing atmospheres, dry chlorine, dry fluorine, and hydrogen halide gases. Low-carbon Nickel 201 provides extra structural stability for high-temperature fluorochemical systems.
4.3 High-Temperature Stability of Low-Carbon N02201
Nickel 200 may suffer graphite embrittlement above 315°C. N02201’s ultra-low carbon eliminates this risk, preventing thermal fatigue cracking in cyclic high-temperature service.
4.4 Outstanding Fabricability & Weldability
Annealed pure nickel exhibits excellent cold bending, deep drawing, stamping, and machining. Weldable via GTAW, GMAW, and SMAW with matched filler metals. No post-weld hardening or sensitization, ensuring reliable on-site assembly of large vessels and piping.
4.5 Electrical & Thermal Functional Properties
High conductivity makes both grades suitable for electrical components, vacuum equipment, and heat exchangers. Stable ferromagnetic properties meet precision electromagnetic instrument requirements.
5. Product Range & Specifications
We provide full-series ASTM/ASME UNS N02200 and N02201 finished products, plus additional corrosion-resistant alloys:
- Forged Pipe Fittings & Anchor Flanges: Elbows, tees, reducers, caps, alkaline-resistant anchor flanges; sizes NPS 1/2–60, wall thicknesses SCH10–SCH160, custom heavy-wall forgings available.
- Seamless Pipes & Tubes: Hot-finished or cold-drawn, OD 16 mm–720 mm, WT 3 mm–90 mm, with custom cutting and non-standard processing.
- Plates, Sheets & Bars: Thick plates, thin sheets, round and flat bars, custom forging blanks, CNC precision parts.
- Standard Flanges & Custom Forgings: WN, SO, blind flanges and special load-bearing forgings for chlor-alkali, high-temperature chemical, and new energy projects.
- High-Alloy Specialty Items: We also manufacture ASME B16.11 socket-weld fittings in UNS N08926 (super austenitic stainless steel). Example specifications include:
- C&N ASME B16.11 2″ × 1″ 3000LB coupling, UNS N08926, with precise OD measurement control.
- C&N ASME B16.11 2″ 3000LB socket-weld elbow, UNS N08926, complete dimensional inspection per code.
Factory Quality Assurance: Full-batch PMI, mechanical and hardness testing, 100% UT/MT NDT, dimensional verification. All products supplied with EN 10204 3.1 mill test certificates.
6. Main Application Fields
6.1 Nickel 200 (N02200, ≤315°C)
- Ambient-temperature chlor-alkali storage tanks and caustic piping
- Electronic components, conductive terminals, vacuum equipment, battery materials
- Food, pharmaceutical, and distilled water anti-corrosion equipment
- Marine auxiliary and seawater cooling systems
6.2 Nickel 201 (N02201, ≤677°C)
- High-temperature caustic evaporators, alkali concentration furnaces, chlor-alkali high-pressure piping
- Hydrogen reformer furnaces, hydrogenation reactors, high-efficiency heat exchangers
- Fluorochemical dry halogen processing, high-purity chemical devices
- Nuclear cooling pipelines, pharmaceutical high-temperature purification, industrial furnace structures
7. Quality Control & Product Marking
All UNS N02200 and N02201 products are manufactured under ISO 9001. Unified full-process inspection: raw material PMI re-check → hot forging and standardized heat treatment → mechanical testing → NDT (UT/MT) → dimensional calibration → laser permanent marking → vacuum moisture-proof packaging.
Finished products are free from surface cracks, inclusions, overlaps, and oxidation. Laser marking includes brand, grade, UNS number, standard, heat number, size, and wall thickness for full traceability.
8. Industry Trends
- Green Hydrogen & Chlor-Alkali Growth: Low-carbon Nickel 201 is becoming the core material for high-temperature alkaline electrolysis hydrogen production.
- Semiconductor-Grade Purification: Ultra-low-impurity N02200/N02201 is increasingly used in electronic chemical and wet processing systems.
- Standardized Fitting Packages: Matched anchor flanges, special forgings, and valve parts are supplied as one-stop piping solutions for EPC contractors.
- Green Manufacturing: Near-net-shape forging and eco-friendly passivation replace high-consumption processes, aligning with global carbon neutrality standards.
- Digital Simulation: FEA analysis enables lightweight yet safe designs for pressure vessels and furnace components, reducing project costs.
Why Choose us？
Choose C&N / HONGCHENG for your full lifecycle Nickel 200 (UNS N02200) and Nickel 201 (N02201) needs — from ambient to 677 °C caustic and fluorochemical service. We supply a complete ASTM/ASME range of seamless pipes, forged fittings, anchor flanges, plates, and custom pressure forgings, all with full traceability, EN 10204 3.1 certification, and fast non‑standard delivery. Contact us today for inventory, technical support, and one‑stop EPC solutions.
