Cr30Ni70
Cr30Ni70 (also known as Ni70Cr30) is a high-performance nickel-chromium-based electrical heating alloy. With an optimized chromium (Cr) to nickel (Ni) ratio (30% Cr, 70% Ni), it combines excellent oxidation resistance, high-temperature stability, and uniform resistivity, making it widely applicable in industrial electric furnaces, household appliances, and high-temperature heating equipment.
Nickel-Chromium Electrical Heating Alloy Cr30Ni70 Product Introduction
Product Overview
Cr30Ni70 (also known as Ni70Cr30) is a high-performance nickel-chromium-based electrical heating alloy. With an optimized chromium (Cr) to nickel (Ni) ratio (30% Cr, 70% Ni), it combines excellent oxidation resistance, high-temperature stability, and uniform resistivity, making it widely applicable in industrial electric furnaces, household appliances, and high-temperature heating equipment.
Key Features
Superior High-Temperature Performance
Maximum Operating Temperature: 1250°C (long-term stable operation up to 1150°C).
Oxidation Resistance: High chromium content forms a dense Cr₂O₃ oxide layer, effectively resisting high-temperature corrosion.
Stable Electrical Properties
Resistivity: 1.18 μΩ·m (20°C), with low temperature coefficient for stable power output.
Thermal Fatigue Resistance: Resistivity change rate <2% under thermal cycling.
Excellent Mechanical Strength
Tensile Strength: ≥750 MPa, maintaining good toughness at high temperatures.
Processability: Suitable for wire drawing, strip rolling, winding, and other complex forming processes.
Recommended Applications
Precision Industrial Heating: Semiconductor sintering furnaces, vacuum heat treatment equipment.
Household Appliances: High-end electric ovens, coffee machine heating tubes.
Harsh Environments: Scenarios requiring frequent start-stop cycles or ±1°C temperature control accuracy.
Selection Guidance
Cr30Ni70 is an upgraded choice over Cr20Ni80 for users prioritizing long lifespan and low maintenance costs with sufficient budget. For ultra-high temperatures (>1300°C), consider combining with FeCrAl alloys.
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Performance Comparison with Similar Alloys
|
Property |
Cr30Ni70 |
Cr20Ni80 |
FeCrAl(0Cr21Al6) |
|
Max Temp |
1250°C |
1200°C |
1400°C |
|
Oxidation Resistance |
Excellent (Cr-based) |
Good |
Moderate (Al-based, prone to pulverization) |
|
Resistivity (μΩ·m) |
1.18 |
1.09 |
1.45 |
|
Cost |
High |
Medium |
Low |
|
Applications |
Precision heating |
General heating |
Ultra-high-temp furnaces |
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