X20Cr13, 1.4021, 1.4022 – Stainless steel
X20Cr13, 1.4021, 1.4022, ASTM 420 – martensitic stainless steel with high tensile strength with good corrosion properties. Steel is machinable and well suited for the production of parts of higher structural units with good resistance to, for instance, water steam, fresh water in general, certain alkaline solutions and other slightly aggressive chemicals. It is completely unsuitable for the use in salty or in other chloride environment. It is used in pumps, shafts, spindles, piston rods, agitators, screws etc. This material is good to weld, provided the use of welding electrodes of a very similar material. This steel is generally easier to process than the “conventional” austenitic steels. The heat treatment condition of the 1.4021 material is QT700 and should be hot formed, in the temperature range between 1100-800 °C. Slow cooling after hot forming.