What are the material numbers and their designation system according to DIN EN 10027-2?
Material numbers uniquely identify material compositions and follow a set designation system. Each number consists of digits for the main group and chemical composition, making it internationally recognized in standards such as the DIN-EN classification.
Listing of material numbers and their designation system according to DIN EN 10027-2
The EN material numbers serve to uniquely designate a material. They are usually composed of five digits.
Stainless steel 1.4571 (ASTM designation 316Ti) is used as a standard at ACI Industriearmaturen GmbH unless otherwise agreed, therefore we will consider this chemically highly resistant stainless steel as an example.
1.4571(+AT)
| 1. | 45 | 71 | Main material group |
| 1. | 45 | 71 | Steel group number |
| 1. | 45 | 71 | Steel grade number |
| | +AT | Additional symbols (usually heat treatment or surface condition) |
The main material group is separated from the steel group number and the steel grade number by a point. In general, the material number provides information about the chemical composition, technological properties, heat treatment condition, or surface quality of a metallic material. These properties are determined according to standardized testing methods.
Next, we will look at the breakdown of stainless steel 1.4571 as an example.
| 1. | Steel or steel casting | |
| 45 | Stainless steels with special additives | |
| 71 | Within a steel group, each grade receives its own numbering | |
| +AT | Heat treatment in the delivery state: Solution annealed |
Further information is provided by the material short name. For 1.4571, this is:
X6CrNiMoTi 17-12-2
| X | denotes a high-alloy steel, where the proportion of at least one alloying element is more than 5%. | For high-alloy steels, the mass fraction of the alloying elements is always calculated as 1. (Exception: Carbon) |
| 6 | Mass fraction of carbon: | 6/100 = 0.06% (The mass fraction for carbon is always divided by 100) |
| Cr | Mass fraction of chromium: | 17% |
| Ni | Mass fraction of nickel: | 12% |
| Mo | Mass fraction of molybdenum: | 2% |
| Ti | Mass fraction of titanium: | not stated (here 0.3 - 0.7% according to DIN EN 10088-3) |
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