Detailed classification by chemical composition (boundaries for non-alloying elements).
Here is the pdf link to EN 10020:2000 which you could access here en 10020 pdf
Expect to pay between €70 and €150 for a single-user PDF, depending on the country. and other specialized materials.
Understanding EN 10020: The Essential Guide to Steel Classification en 10020 pdf
This residual category encompasses all steel grades that contain specific alloying elements in amounts exceeding the limits for non-alloy steels but do not necessarily meet the chromium threshold for stainless steel. This includes high-strength low-alloy (HSLA) steels, tool steels, and other specialized materials.