1.4021 - Martensitic stainless steel / X20Cr13 / AISI 420 / Z20C13 / S42000

Description

Material 1.4021 is a martensitic stainless steel according to EN 10088 with the EN designation X20Cr13 and the international equivalents AISI 420, UNS S42000 and AFNOR Z20C13. The material 1.4021 or X20Cr13 belongs to the group of martensitic chromium stainless steels. The designations 1.4021, X20Cr13, AISI 420, UNS S42000 and Z20C13 are used in standards and material catalogues for this martensitic stainless steel.

 

The chemical composition of 1.4021 according to EN 10088 includes 0.16 to 0.25 percent carbon, 12.0 to 14.0 percent chromium, a maximum of 1.0 percent silicon, a maximum of 1.5 percent manganese, a maximum of 0.040 percent phosphorus, a maximum of 0.015 percent sulphur and a maximum of 0.11 percent nitrogen. The chromium content enables the formation of a passive chromium oxide layer responsible for the corrosion resistance of stainless steel. The material 1.4021, also designated X20Cr13, AISI 420 and UNS S42000, develops a martensitic microstructure after appropriate heat treatment and is magnetic.

 

The martensitic stainless steel 1.4021 or X20Cr13 is hardenable by heat treatment. For material 1.4021, hardening followed by tempering is documented as heat treatment. The material 1.4021, X20Cr13, AISI 420 and UNS S42000 is magnetic in the hardened and tempered condition and exhibits high mechanical strength.

 

Typical applications for material 1.4021, X20Cr13, AISI 420 and UNS S42000 include cutlery, surgical instruments, machine components, pump parts, valve components as well as shafts and axles manufactured from martensitic stainless steel.