Nickel 201 Product Introduction
Product Overview
Nickel 201 (UNS N02201) is a low-carbon high-purity nickel alloy (99.6%+ nickel content) engineered to combine the intrinsic corrosion resistance of pure nickel with enhanced high-temperature stability. Unlike low-expansion Invar (Ni-Fe), nickel-copper Monel, or high-temperature Nimonic (Ni-Cr-Co), Nickel 201 is defined by its ultra-low carbon content (≤0.02%)—a critical upgrade from its counterpart Nickel 200 (C≤0.15%). This low-carbon design eliminates intergranular corrosion risk at temperatures up to 650℃, while retaining pure nickel’s exceptional resistance to media (e.g., dilute hydrochloric acid, sulfuric acid) and excellent ductility. It operates stably from cryogenic temperatures (-269℃) to 650℃, with good thermal/electrical conductivity, making it ideal for chemical processing, low-temperature engineering, and high-purity applications—where “high nickel purity + low-temperature toughness + high-temperature anti-intergranular corrosion” are core requirements.
International Grade Comparison
Standard System | Grade | Description |
ASTM (USA) | N02201 | UNS Unified Numbering System Grade (exclusive for Nickel 201) |
EN (EU) | Ni201 | EN 10088-1 Standard Grade (low-carbon high-purity nickel) |
JIS (Japan) | NW02201 | JIS G4902 Standard Grade (equivalent to Nickel 201) |
DIN (Germany) | 2.4068 | DIN 17750 Standard Grade (low-carbon variant of Nickel 200’s 2.4066) |
ISO (International) | Ni201 | ISO 6363 Standard Grade (high-purity low-carbon nickel alloy) |
Physical Properties (Room Temperature & Key Performance Highlights)
Property Indicator | Typical Value (Room Temp) | Unit | Performance Advantage |
Tensile Strength | ≥380 | MPa | Retains ≥240 MPa at 600℃; no brittle failure at -196℃ |
Yield Strength (0.2% Offset) | ≥140 | MPa | 600℃ yield strength: ≥110 MPa; maintains ductility at high temps |
Elongation (50mm Gauge Length) | ≥40 | % | Exceeds 50% elongation at cryogenic temps (-200℃) |
Density | 8.89 | g/cm³ | Consistent with pure nickel; higher than Ni-Fe/Ni-Cu alloys |
Melting Point | 1435-1455 | ℃ | Stable liquidus/solidus; no phase transformation in service range |
Thermal Conductivity (20℃) | 90.9 | W/(m·K) | 30% higher than stainless steel; ideal for heat transfer components |
Electrical Resistivity (20℃) | 0.082 | μΩ·m | Low resistivity for electrical applications (e.g., bus bars) |
Magnetic Property | Ferromagnetic | — | Weak magnetism; negligible impact on most applications |
Chemical Composition (Mass Fraction, High-Purity & Low-Carbon Focus)
Chemical Symbol | Composition Range (%) | Role in Performance |
Ni | ≥99.6 (Balance) | Core matrix; delivers pure nickel’s corrosion resistance and ductility |
C | ≤0.02 | Ultra-low content prevents intergranular corrosion at 300-650℃ (key difference from Nickel 200) |
Mn | ≤0.35 | Improves hot workability; reduces hot cracking during forging |
Fe | ≤0.40 | Trace impurity control; avoids reducing corrosion resistance |
Si | ≤0.35 | Minimizes oxide inclusions; maintains material uniformity |
S | ≤0.01 | Ultra-low sulfur prevents brittle fracture in cold working |
Cu | ≤0.25 | Trace addition to enhance low-temperature toughness |
Product Characteristics
1.Superior High-Temperature Anti-Intergranular Corrosion: Ultra-low carbon (≤0.02%) eliminates carbide precipitation at grain boundaries, avoiding intergranular corrosion in 300-650℃ environments (e.g., high-temperature chemical reactors)—a key advantage over Nickel 200;
2.Excellent Resistance to Reductive Media: Pure nickel matrix resists dilute hydrochloric acid, sulfuric acid, phosphoric acid, and organic acids (e.g., acetic acid) in reducing conditions; suitable for chemical processing of non-oxidizing acids;
3.Exceptional Low-Temperature Toughness: Maintains high ductility and impact strength at cryogenic temperatures down to -269℃ (liquid helium temp); no brittle transition—ideal for LNG storage and cryogenic equipment;
4.Good Thermal & Electrical Conductivity: Thermal conductivity (90.9 W/(m·K)) and electrical resistivity (0.082 μΩ·m) close to pure nickel; suitable for heat exchangers and electrical components (e.g., battery tabs);
5.Versatile Processability: Compatible with cold/hot working (rolling, forging, deep drawing) and all welding methods (TIG/MIG, resistance welding); post-weld heat treatment optional due to low carbon content.
Metallographic Structure
At room temperature, Nickel 201 features a single-phase face-centered cubic (FCC) austenitic matrix with uniform fine grains (ASTM 5-8 grades). The ultra-low carbon content ensures no carbide (Ni₃C) precipitation at grain boundaries—even after long-term exposure to 650℃. No secondary phases or brittle intermetallics form in the service range (-269℃ to 650℃), ensuring consistent mechanical properties and corrosion resistance across the material. The high-purity nickel matrix also minimizes impurity inclusions, further enhancing structural stability.
Product Forms and Executive Standards
