is the definitive trilingual (English, German, French) cross-reference guide for over 75,000 steel designations. To find data without a full purchase: ASM International Official Leaflets : The publisher, Verlag Stahlschlüssel
While the PDF is hard to find safely, the data inside it is widely available for free through online cross-reference tools. These are often faster than a PDF because they are searchable. stahlschlussel key to steel pdf free