E-Brite (also sold as E-Brite 26-1) was the first commercially produced superferritic stainless steel and remains the benchmark grade for the family. It is registered as UNS S44627 and covered by ASTM A240 (plate, sheet, strip) and A268 (tubing) under the alloy designation XM-27. What sets E-Brite apart from ordinary ferritic grades like 430 is the combination of high chromium (25-27.5%) and molybdenum (0.75-1.5%) with extremely tight control of carbon and nitrogen — the interstitial elements that make conventional high-chromium ferritics brittle and prone to sensitization. Modern AOD and vacuum melting practice keeps combined C+N low enough that E-Brite retains useful ductility and weldability despite its very high alloy content.

That combination gives E-Brite corrosion resistance that rivals or exceeds many austenitic grades — including strong resistance to chloride pitting, crevice attack, and, because it is ferritic rather than austenitic, complete immunity to chloride stress corrosion cracking. It is specified for heat exchanger tubing, condensers, and process equipment handling chlorides, seawater, and high-purity or ultra-pure water where austenitic grades would be at risk of SCC. Because it is a lean-nickel ferritic, it is also significantly less expensive to alloy than comparable superaustenitic grades while matching much of their corrosion performance in chloride service.

E-Brite is sometimes cross-referenced against ASTM B625, but that specification actually covers Ni-Fe-Cr-Mo nickel alloy plate/sheet/strip, not ferritic stainless — A240 (plate/sheet/strip) and A268 (tubing) are the correct governing ASTM specifications for UNS S44627.

Per ASTM A240/A268 UNS S44627. The very low C+N ceiling (combined interstitials) is what distinguishes this superferritic grade from ordinary high-chromium ferritic stainless steels.

As a ferritic stainless, E-Brite does not work-harden nearly as aggressively as an austenitic grade, and it does not require the same obsessive avoidance of dwell that a 304 or 316 job does. That said, the 25-27.5% chromium and molybdenum content make it considerably more abrasive on the flank face than a plain 430-type ferritic, and its low thermal conductivity still concentrates cutting heat at the tool tip rather than carrying it off in the chip. Expect flank wear to be the dominant failure mode rather than built-up edge or work-hardening related chipping.

Rigid setups, sharp positive geometries, and steady, adequate feed rates produce the best results — light finishing passes at reduced feed tend to rub rather than shear and accelerate wear without improving surface finish. Coolant is recommended both to control heat and to help evacuate chips, since the ductile ferritic matrix produces long, continuous chips that need active breaking. Because E-Brite is typically supplied and used in the annealed condition, hardness variation between lots is modest, but stock condition should still be confirmed before setting speeds on critical work.

Turning

Parting / Grooving

Milling