3J21 Cobalt Based Alloy

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3J21 Cobalt Based Alloy

Physical and Mechanical Properties

Density

8.30g/cm³

Melting point

1427°C

Elongation

5-30%

Tensile strength

970Mpa

Yield strength

480MPa

Product Form and Standard Specification

Bar

YB/T 5253-2011

Plate

ASTM F1058 Grade 1

Strip

AMS5833

Wire

AMS5834

Forging

AMS5876

3J21 is a high-performance cobalt-based alloy, distinguishing itself with a unique composition and exceptional performance characteristics, making it essential in aviation, aerospace, precision instrument manufacturing, and other demanding fields. Renowned for its superior elasticity, corrosion resistance, high-temperature stability, and non-magnetic properties, 3J21 is an indispensable material in modern industrial applications.

Features

Non-magnetic performance: Ideal for magnetically sensitive environments, 3J21 alloy is frequently used in magnetic sensors, magnetic shielding, and precision instruments where magnetic interference must be avoided.
Excellent corrosion resistance: The alloy resists oxidation, vulcanization, and chemical corrosion across a variety of media, making it suitable for chemically aggressive environments.
High elasticity and fatigue resistance: 3J21 alloy maintains mechanical stability under repeated deformation, making it suitable for elastic elements and high-precision components.

Application

Precision instruments: Used in components such as tension wires and spiral springs requiring high elasticity, precision, and long-term stability.
Aerospace and aviation: Applied in engine blades, precision bearings, and elastic structural components with high-temperature and fatigue resistance.
Magnetic sensors and shielding: The alloy’s non-magnetic nature and material sensitivity make it ideal for sensor components in magnetic detection systems.
Chemical and petrochemical industries: Suitable for producing corrosion-resistant pipelines and equipment that must operate in harsh chemical or high-temperature environments.
Medical devices: Used in applications such as artificial joints and implantable medical components, where biocompatibility and corrosion resistance are essential.

Chemical compositions

Element	Min. %	Max. %
C	-	0.15
Mn	1.5	2.5
Si	-	1.2
P	-	0.015
S	-	0.015
Cr	19	21
Ni	14	16
Co	39	41
Mo	6	8
Be	-	0.1
Fe	-	Bal

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