1J22 (1J252) Permendur-Type Soft Magnetic Alloy

1J22 (also designated 1J252) is a Chinese high-saturation-induction cobalt-iron-vanadium soft-magnetic alloy, corresponding to 2V Permendur (Co50V2 / UNS R30005 / ASTM A801 Alloy 1). It combines the highest saturation induction among commercial soft-magnetic alloys with a very high Curie point and large magnetostriction, making it the material of choice for electromagnet pole pieces, magnetostrictive transducers and high-performance aerospace magnetic components.

Overview

• Material: 1J22 (1J252) — high-Bs Co-Fe-V soft-magnetic alloy
• Close equivalents: Co50V2 / 2V Permendur / UNS R30005 / ASTM A801 Alloy 1
• Standards: GB/T 14986.3-2018; ASTM A801-14 Alloy 1
• Available forms: Bar, plate, thin strip, fine wire, forgings and custom profiles

Chemical Composition

The vanadium content (typically ~1.4–1.8 % in 2V Permendur) is not stated on the source page. Confirm the full composition against your mill certificate before publication.

Physical & Magnetic Properties

• High saturation induction and high Curie point;
• High initial permeability, low hysteresis loss and low coercivity.

Mechanical Properties

• Relatively high tensile strength and hardness, with good ductility and toughness;
• Able to withstand substantial pressure and impact loading.

Key Features

• Good thermal stability and corrosion resistance;
• Relatively high electrical conductivity;
• Retains high magnetic properties at elevated temperature;
• Note: the alloy oxidises readily and has relatively poor machinability.

Heat Treatment

• Final heat treatment requires slow cooling;
• After rapid quenching from about 880 °C, the alloy can be processed into thin strip and fine wire.

Typical Applications

• Electromagnet pole pieces;
• End-seal tubes in magnetrons;
• Telephone earphone diaphragms;
• Large rotors of torque motors;
• Cores of magnetostrictive transducers;
• Aerospace electrical components — microelectronic rotors, electromagnet pole pieces, relays and transducers.

For detailed datasheets, magnetic-protocol test reports or inquiries on specific sizes and tolerances, please contact our sales & engineering team.