China ramps up CHSN01 fusion magnet jacket for cryogenic reactors

Tokyo, Japan (SPX) Jan 06, 2026

China has produced 30 tons of cryogenic jacket material made from its CHSN01 steel in continuous lengths of about 5 km for use in Cable-in-Conduit Conductors for future fusion reactors. The jacket is designed for magnets that must endure strong fields and very low temperatures in advanced fusion devices.

Mechanical tests at 4.2 K show the CHSN01 jacket reaches an average yield strength of