ISO/TS 4949:2016 PDF

Overview

ISO/TS 4949:2016 is an international Technical Specification that defines rules for abbreviated steel names based on letter symbols. It provides a consistent system to designate steel grades by combining letters and numbers that express application and principal characteristics (mechanical, physical, chemical). The document ensures a unique, unambiguous steel name for each standardized steel grade and can be applied internationally or at national/regional levels.

Key Topics

• Unique steel names: one distinct designation per steel; symbols written without spaces.
• Groups of designation:
  • Group 1 - steels designated by application and mechanical/physical properties (e.g., S = structural, P = pressure, L = linepipe, E = engineering). Numbers indicate specified minimum yield or tensile strength (MPa) or other relevant metrics.
  • Group 2 - steels designated by chemical composition, subdivided into:
    • Sub-group 2.1: Non-alloy steels (C prefix) - carbon indicated as 100 × %C.
    • Sub-group 2.2: Non-alloy/alloy steels with minor alloying (