Stainless steel can be made in various ways, depending on the manufacturing process, the steel has a different structure and thus other properties.
Basically, steels can be subdivided into the following categories:
- Precipitation hardening
In the AISI system, steels are classified with a 3-digit number, which generally distinguishes the 200, 300, 400, 500 and 600 series.
AISI 400 Series > Ferritic and martensitic chromium alloys
These main categories are each divided into further subcategories. For example, the AISI 400 series is still divided into AISI 405, AISI 408, AISI 409, AISI 410, AISI 430 and AISI 440.
AISI 420, for example, is a carbon-rich stainless steel with a chromium content of at least 12%. When annealed, AISI 420 has good ductility and excellent corrosion resistance.
The AISI 420 class has the highest hardness - 50HRC - among all stainless steels with 12% chromium.
When talking about AISI 420 in German-speaking countries will be quality grade 1.4021 generally refers to the chemical name X20Cr13.
Since the German system for designating the material numbers according to DIN EN 10027-2 is structured more precisely or more specifically, several German material numbers fall under the designation AISI 420. For example, the materials 1.4021 – 1.4028 – 1.4031 – 1.2083 and – 1.2316 are also covered by the AISI standardization AISI 420.
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