EN ISO 683-5:2021 PDF

Overview

EN ISO 683-5:2021 (adopting ISO 683-5:2017) specifies the technical delivery requirements for nitriding steels. It covers semi‑finished products (blooms, billets, slabs), bars, wire rod, hot‑rolled plates (including wide flats), and hammer/drop forgings manufactured from the nitriding steels listed in the standard. The steels are generally intended for fabrication of quenched‑and‑tempered, subsequently nitrided machine parts. The document is published by CEN and aligns with the international ISO text.

Key topics and requirements

• Scope of products: semi‑finished products, bars, wire rod, hot‑rolled plates and forgings supplied in specified heat‑treatment and surface conditions (see Tables 1–3 in the standard).
• Heat‑treatment & surface condition: defined delivery conditions (normal and particular) for different product types; traceability of cast and heat treatment requirements.
• Chemical composition and mechanical properties: mandatory chemical analyses and mechanical property limits for specified sizes (sizes referenced in Table 6).
• Hardness & machinability: hardness verification, machinability guidance and limits applicable to nitriding steels.
• Quality attributes: rules on grain size, non‑metallic inclusions (microscopic and macroscopic), internal soundness, decarburization, and surface quality.
• Inspection and testing: prescribed test methods for chemical analysis, hardness, mechanical tests and impact tests, frequency of testing and conformity documents (inspection certificates).
• Marking and documentation: marking, ordering information (mandatory purchaser information and options), and examples for ordering.
• Flexibility by agreement: special or supplementary requirements may be agreed at enquiry/order stage (see Clause 5.2 and Annex B).
• Normative and informative annexes: include ruling sections for mechanical properties, supplementary requirements, cross‑references to European steel numbers and applicable dimensional standards.

Applications and users

• Who uses it: steel producers, raw material suppliers, heat‑treatment shops, forging and rolling mills, OEMs, procurement and quality engineers, metallurgists, and testing laboratories.
• Practical value:
  • Ensures consistent material quality and traceability for components intended for nitriding.
  • Supports correct material selection for manufacturing nitrided machine parts (shafts, gears, fasteners, tool holders).
  • Facilitates procurement and inspection by defining test methods, delivery conditions and acceptance criteria.
  • Reduces risk of performance issues related to decarburization, inclusions or improper heat treatment.

Related standards

• ISO 683-5:2017 (original international text)
• ISO 404 (general technical delivery requirements applicable in addition)
• Normative references to dimensional and testing standards listed in the document (e.g., EN 10017, EN 10204).

Keywords: EN ISO 683-5:2021, nitriding steels, technical delivery requirements, heat‑treatable steels, ISO 683-5:2017, nitriding, mechanical properties, heat treatment, surface condition.