Durable Type N Thermocouple Alloy Strip NP/NN 0.20×25mm for Thermal Engineering and Test Instruments

Price Negotiable

Price: Negotiable

MOQ: 10KG

Delivery Time: 5-21 days

Brand: Huona

Product Description

Type N Thermocouple Alloy Strip (NP/NN, 0.20×25mm)

Type N thermocouple alloy strip (NP/NN, 0.20mm × 25mm) from Huona New Material is a precision cold-rolled alloy strip designed for high-stability Type N thermocouple sensors and industrial temperature probes. Composed of NP (Nicrosil, positive pole) and NN (Nisil, negative pole) alloy pairs, it delivers superior thermoelectric stability, excellent oxidation resistance, and consistent performance across high-temperature industrial environments.

Standard Designations & Core Specifications

Product Name: Type N Thermocouple Alloy Strip (NP/NN)
Alloy Composition:
- NP (Positive Pole): Nicrosil (Ni: ~84%, Cr: ~14.2%, Si: ~1.4%, Mg: ~0.1%)
- NN (Negative Pole): Nisil (Ni: ~95.5%, Si: ~4.4%, Mg: ~0.1%)
Dimensions:
- Thickness: 0.20mm (tolerance: ±0.005mm)
- Width: 25mm (tolerance: ±0.1mm)
- Form: Coil (standard: 100m/roll; custom cut-to-size sheets available)
Key Thermoelectric Performance:
- Thermoelectric power (at 100℃): ~27.7μV/℃ (meets IEC Class 1 accuracy)
- Operating temperature range: -270℃ ~ 1300℃ (continuous; short-term up to 1350℃)
Compliant Standards: IEC 60584-1, ASTM E230, GB/T 4989, ISO 9001, RoHS 2.0
Manufacturer: Huona New Material (Shanghai) Co., Ltd.

Key Core Advantages

Superior Thermoelectric Stability

Minimal Drift at High Temperatures: Compared to Type K, Type N alloy exhibits significantly lower thermoelectric drift at >1000℃, ensuring long-term measurement accuracy in industrial furnaces and power plants.
Wide Temperature Compatibility: Performs reliably from cryogenic (-270℃) to ultra-high-temperature (1300℃) environments, outperforming Type K in high-temperature stability.

Excellent High-Temperature Oxidation Resistance

Dense Protective Oxide Layer: NP/NN alloys form a stable SiO₂-rich oxide layer at high temperatures, preventing internal oxidation and extending service life in oxidizing atmospheres.
Resistance to Green Rot: Avoids the "green rot" degradation issue common in Type K thermocouples at 800-1000℃, making it ideal for long-term high-temperature monitoring.

Uniform Mechanical & Thermoelectric Consistency

Precision Cold Rolling: Tight thickness/width tolerances ensure uniform thermoelectric response across the entire coil, critical for batch production of consistent sensors.
Vacuum Annealing: Removes residual stress and refines grain structure, ensuring stable mechanical properties and preventing warping during thermal cycling.

Versatile Formability & Joining

Balanced Strength & Ductility: Tensile strength ≥600MPa, elongation ≥25%, enabling easy stamping, bending, and laser cutting into complex probe shapes.
Weldability: Compatible with resistance welding, laser welding, and brazing, ensuring reliable junction formation for industrial sensors.

Harsh Environment Durability

Corrosion Resistance: Excellent resistance to atmospheric corrosion, flue gas, and mild chemical exposure, suitable for petrochemical, power generation, and waste incineration applications.
Fatigue Resistance: Withstands repeated thermal cycling without cracking or performance degradation, ideal for dynamic industrial processes.

Technical Specifications

Attribute	Value (Typical)
Alloy Grade	NP (Nicrosil) / NN (Nisil)
Thickness	0.20mm (±0.005mm)
Width	25mm (±0.1mm)
Form	Coil (100m standard) / Cut-to-size sheets
Thermoelectric Power (100℃)	~27.7μV/℃ (IEC Class 1)
Operating Temperature	-270℃ ~ 1300℃ (continuous)
Tensile Strength	≥600MPa (NP/NN)
Elongation	≥25% (NP/NN)
Density	~8.2g/cm³ (NP), ~8.0g/cm³ (NN)
Surface Finish	Bright pickled (standard)

Product Specifications

Item	Specification
Supply Form	Coil (100m/roll); custom cut-to-size sheets available
Dimensions	0.20mm (T) × 25mm (W)
Surface Treatment	Bright pickled / electro-polished (optional)
Packaging	Anti-oxidation paper + wooden reel (vacuum-sealed for long-term storage)
MOQ	50kg (small batches for R&D available)
Customization	Thickness (0.08-3.0mm), width (5-300mm), coil length, annealing condition
Processability	Stamping, bending, laser cutting, resistance welding, laser welding, brazing

Typical Application Scenarios

Power Generation Monitoring: Temperature probes for boiler superheaters, turbine exhaust, and waste heat recovery systems.
Industrial Furnace Control: Long-term high-temperature measurement in steel reheat furnaces, annealing furnaces, and glass melting kilns.
Petrochemical & Refining: Temperature sensors for catalytic crackers, reformers, and flue gas monitoring.
Aerospace & Cryogenics: Temperature sensing in rocket engine components, satellite thermal control, and cryogenic storage systems.
Laboratory R&D: Precision high-temperature measurement in material testing, thermal analysis, and scientific research instruments.