3J21
Co-Ni-Cr-Mo high-elasticity alloy for precision springs, diaphragms and watch hairsprings.
Introduction
§01 — General3J21 is a cobalt-nickel-chromium-molybdenum elastic alloy combining high elastic limit, excellent fatigue resistance and non-magnetic behavior. It is used for precision instrument springs, pressure sensor diaphragms, watch hairsprings and elastic sensing elements where high elastic performance and long-term dimensional stability are required.
Quick Facts
- Density
- 8.3 g/cm³
- Max Service Temp
- 350°C
- Series
- Precision
Available Product Forms
§02 — FormsKey Characteristics
§03 — FeaturesTypical Uses
§04 — ApplicationsFrequently Asked Questions
3J21 FAQWhat is 3J21 used for?
3J21 is a Precision alloy used in Precision instrument hairsprings and Pressure sensor diaphragms. It offers High elastic limit and Excellent fatigue life.
What is the chemical composition of 3J21?
3J21 is a controlled-composition Precision alloy supplied to GB/T 14986 and YB/T 5253. Contact us for full mill test certificate with heat-specific chemistry.
What forms is 3J21 available in?
3J21 is regularly supplied in Wire, Strip, Bar & Rod. Custom forms and dimensions available on request.
What is the maximum service temperature of 3J21?
3J21 is rated for service up to 350°C. Contact our metallurgy team for specific application recommendations.
Need 3J21 material?
Request a quote with your specification — grade, form, dimensions and quantity.