EN ISO 683-2:2018 PDF

Overview

EN ISO 683-2:2018 (adoption of ISO 683-2:2016) specifies the technical delivery requirements for a range of heat‑treatable alloy steels for quenching and tempering. Published by CEN, this part of ISO 683 covers semi‑finished products (blooms, billets, slabs), bars, wire rod, finished flat products and hammer/drop forgings manufactured from the alloy steels listed in the standard. The steels are generally intended for manufacture of quenched and tempered or austempered, and flame‑ or induction‑hardened machine parts. The document sets requirements for chemical composition, mechanical properties (within the sizes given in the standard), surface and heat‑treatment conditions, inspection and testing, and marking.

Key topics and requirements

• Scope of products: semi‑finished products, bars, wire rod, finished flat products, hammer/drop forgings (with specific exclusions for bright products and cold‑heading stock).
• Heat‑treatment and surface conditions: defined delivery conditions (see Tables 1 and 2 in the standard) for tempering, hardening and surface treatment.
• Chemical composition and mechanical properties: requirements tied to the alloy steels listed (Table 3) and to mechanical property ruling sections (Table 8); sizes for which mechanical properties apply are specified.
• Hardenability and hardness: verification procedures for hardenability and surface hardness; testing methods and sample locations are described.
• Inspection and testing: chemical analysis, tensile and impact testing, hardness tests, non‑destructive testing and frequency of testing; test documentation per EN/ISO practices.
• Traceability, marking and documentation: cast traceability, marking rules and inspection certificates (e.g., EN 10204).
• Options and special requirements: purchaser/supplier agreements can modify delivery requirements (see Annex B).
• Normative and informative annexes: designation cross‑references, applicable dimensional standards and bibliographic references.

Applications

EN ISO 683-2:2018 is used to specify and supply alloy steels intended for components that require controlled quenching and tempering or induction/flame hardening, such as machine parts requiring high strength, wear resistance and predictable mechanical performance. Typical uses include shafts, gears, forged components and other engineered parts subjected to heat treatment.

Who should use this standard

• Steel manufacturers and mills for product specification and delivery
• Heat‑treatment and forging shops for acceptance and processing criteria
• OEMs and procurement teams writing material specifications
• Quality, inspection and testing laboratories ensuring compliance
• Design and materials engineers selecting steels for quenched/tempered parts

Related standards

• ISO 683‑18, ISO 4954 (bright products / cold‑heading stock)
• ISO 404 (general technical delivery requirements)
• EN 10204 (inspection documents), plus referenced dimensional and NDT standards listed in the bibliographic annexes

Keywords: EN ISO 683-2:2018, alloy steels for quenching and tempering, heat‑treatable steels, technical delivery requirements, hardenability, chemical composition, mechanical properties.