Product Description

6J13 Manganin Alloy Strip

Product Overview

6J13 manganin alloy strip, a high-precision resistance alloy product independently developed and manufactured by Tankii Alloy Material, is a typical copper-manganese-nickel (Cu-Mn-Ni) based precision resistance alloy. Crafted via advanced vacuum smelting, multi-pass cold-rolling, and controlled atmosphere annealing processes, this strip achieves ultra-tight dimensional tolerances and consistent electrical properties. It integrates the core advantages of manganin alloys: stable high resistivity, low resistance temperature coefficient (TCR), and excellent corrosion resistance —making it the preferred material for high-stability resistors, precision current shunts, and electrical measuring components in industrial instrumentation, automotive electronics, and precision equipment fields.

Standard Designations & Material Foundation

Key Advantages (vs. Common Resistance Alloys)

The 6J13 manganin strip stands out for its balanced precision performance and processability:

Resistivity is stably maintained at 0.44±0.04 μΩ·m (20℃) , and the average resistance temperature coefficient (TCR) ranges from -20×10⁻⁶/℃ to +20×10⁻⁶/℃ within -50℃ to 150℃ , which is lower than that of constantan (6J40: ±40×10⁻⁶/℃ ). After 1000 hours of operation at 120℃, the resistance drift is less than 0.01%, ensuring long-term measurement accuracy of precision instruments.

The alloy’s uniform microstructure (grain size ≤25μm) enables excellent cold working performance. In half-hard temper, its tensile strength reaches 550-650 MPa, and elongation is 15-20% , which can withstand high-precision stamping and bending (minimum bending radius ≥2× thickness) without cracking. The bright annealed surface (Ra ≤0.2μm) is suitable for ultra-fine chemical etching, with a minimum etched line width of 0.03mm.

The Cu-Mn-Ni alloy system forms a dense passive film, which can resist atmospheric corrosion, freshwater, and mild chemical environments (pH 4-10). It passes 1000-hour ASTM B117 salt spray testing with no obvious corrosion. Meanwhile, it has low thermoelectric potential (≤2μV/℃ vs. copper), effectively reducing measurement interference in low-voltage circuits .

Compared with 6J12 manganin alloy (resistivity 0.47±0.03 μΩ·m ), 6J13 has slightly lower resistivity but more stable batch consistency and lower production cost. It is a cost-effective choice for mid-to-high precision resistance components, balancing performance and economy.

Technical Specifications

Attribute	Value (Typical)
Chemical Composition (wt%)	Cu: 82.0-86.0% (余量); Mn: 12.0-13.0%; Ni: 2.0-3.0%; Fe: ≤0.5%; Si: ≤0.15%; C: ≤0.10%
Thickness	Customizable: 0.05mm-2.0mm (tolerance: ±0.002mm)
Width	Customizable: 10mm-300mm (tolerance: ±0.1mm)
Length per Roll	50m – 300m (cut-to-length available: ≥100mm)
Resistivity (20℃)	0.44±0.04 μΩ·m
Temperature Coefficient of Resistance (TCR)	-20×10⁻⁶/℃ to +20×10⁻⁶/℃ (-50℃ to 150℃)
Thermoelectric Potential (vs Cu)	≤2 μV/℃ (0℃ to 100℃)
Operating Temperature Range	-50℃ to 120℃ (continuous); Short-term: up to 150℃ (≤1 hour)
Tensile Strength	Soft (annealed): 450-550 MPa; Half-hard: 550-650 MPa; Hard: 650-750 MPa
Elongation (25℃)	Soft: ≥25%; Half-hard: 15-20%; Hard: ≤10%
Hardness (HV)	Soft: 130-150; Half-hard: 180-200; Hard: 230-250
Surface Roughness (Ra)	≤0.2μm (bright annealed finish)

Product Specifications

Item	Specification
Surface Finish	Bright annealed (oxide-free, oil-free) – optimal for precision etching; matte finish (customizable)
Flatness	≤0.05mm/m – ensures uniform processing and resistance consistency
Machinability	Compatible with CNC stamping, laser cutting, and chemical etching; no edge burrs after processing
Weldability	Suitable for spot welding and TIG welding – welded joints have resistance variation ≤0.1%
Packaging	Vacuum-sealed in anti-oxidation aluminum foil bags with desiccants; wooden spools (150mm diameter) to prevent deformation
Customization	Temper adjustment (soft/half-hard/hard); width slitting; anti-tarnish passivation treatment; pre-etching patterns

Typical Applications

Tankii Alloy Material implements strict quality control for 6J13 manganin alloy strips: each batch undergoes XRF chemical composition analysis, high-precision TCR testing (temperature-controlled resistance tester with accuracy ±0.1 ppm/℃), laser dimensional inspection, and 1000-hour thermal stability testing. Free samples (100mm×100mm) and detailed material test reports (MTR) are available upon request. Our technical team provides tailored support—including etching parameter optimization and temper selection for stamping processes—to help customers maximize the performance of 6J13 in precision applications.