Steels where the content of any individual element does not reach a specific threshold limit (e.g., Manganese < 1.65%, Silicon < 0.60%, or Chromium < 0.30%).
For any professional dealing with steel—whether you are negotiating a contract, preparing a welding procedure specification (WPS), or simply trying to understand a material certificate—EN 10020 is the Rosetta Stone of steel grades. en 10020 pdf
Typically €50 to €120 (approximately $55–$130 USD), depending on the country and format (watermarked PDF vs. printable). EN 10020:2000 - A European Standard for Non-Alloy