Elastic alloy

Precision elastic alloys are a class of functional materials that combine extremely high strength, excellent elastic properties and excellent durability. These alloys (such as cobalt-based elastic alloys, beryllium bronze and constant elastic alloys, etc.) can maintain stable elastic modulus in harsh environments and are widely used in various precision instruments, sensors, aerospace components and medical devices.

3J21 Precision Elastic Alloy

Jiangsu DZX Technology Co., Ltd. specializes in supplying high-quality 3J21 cobalt-based elastic alloy, providing 3J21 wire, strip, plate and pipe. The products have the characteristics of high elasticity, high strength, corrosion resistance and weak magnetism, and are widely used in aerospace and precision instruments. Direct sales from Jiangsu manufacturers, ready supply, and fast delivery nationwide.

Cobalt-Based Elastic Alloy

3J21

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✓ ISO 9001 Quality
✓ COC & Test Certificates
✓ Established in 2002
✓ OEM & Custom Sizes

Specifications

Plate / Sheet
Thickness: 0.1mm-5.0mm
Width: 50mm-1000mm
Length: 500mm-3000mm
Strip
Thickness: 0.02mm-1.5mm
Width: 3mm-500mm
Delivery Forms: Bright shiny, cold rolled or hot rolled
Rod
Diameter: Ø5mm-Ø80mm
Length: 100mm-2000mm
Wire
Diameter: Ø0.03mm-Ø5mm
Delivery Forms: Bright shiny, supplied in spools
Tube
Outer Diameter: Ø3mm-Ø100mm
Wall Thickness: 0.5mm-10mm
Length: 100mm-6000mm

Chemical Composition

Carbon (C)	Sulfur (S)	Phosphorus (P)	Manganese (Mn)	Silicon (Si)	Nickel (Ni)	Chromium (Cr)	Titanium (Ti)	Aluminum (Al)	Cobalt (Co)	Molybdenum (Mo)	Tungsten (W)	Iron (Fe)	Other Elements
Not greater than
0.07-.12	0.015	0.015	1.70-2.30	0.6	14.0-16.0	19.0-21.0	–	–	39-41	6.5-7.5	–	Rest	–

Physical & Mechanical Properties

Alloy Grade	Density (g/cm³)	Electrical Resistivity (10⁻⁶ Ω·cm)	Thermal Conductivity (W/m·K)	Modulus of Elasticity (GPa)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation at Break (%)	Elastic Limit (MPa)	Fatigue Life (cycles)	Working Temperature Range (°C)	Temperature Coefficient
3J21 (High Elasticity)	8.1	80	11	144	800	1000	10	800	>10⁷	-60-200	Extremely low temperature coefficient of elasticity

Supply Capability

Item	Details
Lead Time	Samples 5-10 days; production 15-30 days
MOQ	Small trial orders accepted
Samples	Available on request
Packaging	Export-standard coil spools / wooden cases
Certificate	COC with chemical composition analysis
Payment	T/T, L/C

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Project Support

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Frequently Asked Questions (FAQ)

How is the chemical composition of 3J21 formulated? Why is it called cobalt-based elastic alloy?

In the composition table, cobalt is the largest item, 39-41%, nickel 14-16%, chromium 19-21%, molybdenum 6.5-7.5%, manganese 1.70-2.30%, the balance of iron is carbon 0.07-0.12%, sulfur and phosphorus ≤0.015%. The cobalt base brings high elastic limit and extremely low elastic temperature coefficient. The page is classified as a cobalt-based high-strength elastic alloy, which is a high-elasticity grade among precision elastic alloys.

What are the strength and fatigue life data for 3J21?

Is the elasticity of 3J21 greatly affected by temperature? What are the key indicators?

How thin and fine can the strips and wires of 3J21 be supplied? What are the delivery statuses?

According to the page specification system: foil thickness 0.02-1.5 mm, width 3-500 mm, cold-rolled bright or hot-rolled; wire diameter 0.03-5 mm bright into coils; plate thickness 0.1-5.0 mm, width 50-1000 mm; rod diameter 5-80 mm; tube outer diameter 3-100 mm. It can be delivered in soft state, hard state, and time-sensitive state, and supports striping according to drawings.

How to distinguish procurement between 3J21 and QBe2, 3J1, and according to what standards?

Remember to make the right purchase: 3J21 cobalt-based high elasticity, elastic limit 800 MPa, -60~200℃; QBe2 beryllium bronze constant elasticity, extremely low temperature sensitivity; 3J1 wide temperature and high strength, -200~500℃, elastic limit 1100 MPa. 3J21 implements the corresponding standards of the GB/T 14992 series and can provide material certification. Ribbon specifications will be verified as soon as they are reported.