Jethete X19 is a high-alloy chromium-molybdenum-niobium-vanadium martensitic creep-resisting stainless steel, registered under EN 10269 as X19CrMoNbVN11-1, Wnr. 1.4913. It sits in the same 11-12% chromium martensitic family as Jethete M152 and X20 but is alloyed specifically for continuous service at higher temperature, adding niobium alongside vanadium to form fine, thermally stable carbonitride precipitates that pin grain boundaries and resist creep deformation at elevated temperature far better than a simple Cr-Mo-V composition would.

Like its Jethete siblings, X19 is supplied and used in the hardened-and-tempered condition, with typical tensile strength in the 900-1050 MPa range after heat treatment. It is a standard material for steam and gas turbine blading and other power-generation hardware operating continuously up to around 600°C (1110°F), where its combination of creep-rupture strength, fatigue resistance, and corrosion resistance from the chromium content outperforms lower-alloy Cr-Mo steels.

Nominal composition per EN 10269 for grade 1.4913 / X19CrMoNbVN11-1.

X19 is one of the more demanding martensitic stainless grades to machine because it is designed to resist exactly the kind of deformation cutting tools rely on — the same niobium and vanadium carbonitrides that give it creep resistance in service also make it highly abrasive to a cutting edge, and it is always machined in the hardened-and-tempered condition rather than annealed. Expect elevated cutting forces, faster flank wear than on a simple 12Cr martensitic grade, and a real risk of edge chipping if feed is too light and the tool rubs instead of shearing.

A rigid machine, rigid workholding, and a sharp, positive cutting edge are non-negotiable. Coolant is important both to manage heat concentration at the tip (thermal conductivity is low, as with all high-chromium stainless) and to help control tool temperature during longer cuts. Because tempering temperature directly controls final hardness, always confirm the certified hardness of the specific lot before setting speeds — the same nominal grade can vary meaningfully in machinability depending on the temper selected by the heat treater.

Turning

Parting / Grooving

Milling