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 — ApplicationsExplore Related Alloys
Frequently Asked Questions
3J21 FAQWhat is 3J21 used for?
3J21 is a Precision alloy used in Precision instrument hairsprings, Pressure sensor diaphragms, Elastic sensing elements. 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. We provide the full mill test certificate with heat-specific chemistry on request.
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.