Overview
ISO 11692:1994 specifies technical delivery requirements for ferritic‑pearlitic engineering steels supplied as billets and bars intended for hot working and for precipitation hardening from hot‑working temperatures. The standard covers required heat‑treatment conditions on delivery (untreated, treated to improve shearability, precipitation‑hardened), surface conditions (e.g., hot‑worked), chemical composition and mechanical property verification, inspection documentation and marking. It is intended to be used together with the general delivery requirements of ISO 404.
Key topics and requirements
- Product scope: Billets and hot‑rolled bars for forging and bars for machining; products supplied in specified heat‑treatment and surface conditions.
- Steel types and chemical composition: Steel grades and cast analysis ranges are listed in tables (see tables 3 and 4). Elements not listed must not be intentionally added without purchaser agreement.
- Mechanical properties: Tensile and yield/0.2% proof stress, elongation and reduction of area requirements for precipitation‑hardened bars are defined (table 5). Testing follows ISO 6892.
- Microstructure and quality: Steels are to have a ferritic‑pearlitic structure after controlled cooling from hot‑working; limits on non‑metallic inclusions can be agreed (Annex A).
- Manufacturing and treatment: All steels must be fully killed. Heat‑treatment conditions on delivery are defined (TU, TS, TP symbols). Surface discontinuity repair by welding is not permitted; other removals require agreement.
- Inspection and testing: Sampling and test piece preparation per ISO 377‑1/2; cast and product chemical analyses; Brinell hardness limits where relevant (ISO 6506); ultrasonic testing and other nondestructive checks may be required (Annex A).
- Documentation and marking: Inspection documents conform to ISO 10474; marking must allow traceability to cast, steel type and delivery origin.
Applications and users
- Practical uses: specification for raw steel billets and bars destined for hot forging, cold machining, and components that undergo precipitation hardening from hot‑working temperatures.
- Typical users:
- Steel producers and rolling mills preparing deliveries
- Purchasing and procurement teams specifying raw material requirements
- Metallurgists and heat‑treatment shops controlling hardening cycles
- Quality engineers and inspectors performing chemical, mechanical and NDT verification
- Fabricators and forging shops requiring material traceability and agreed surface/size tolerances
Related standards
- ISO 404 (general technical delivery requirements)
- ISO 1035‑1/3/4 (hot‑rolled bar dimensions and tolerances)
- ISO 10474 (inspection documents)
- ISO 377‑1/2 (sample selection/preparation)
- ISO 6892 (tensile testing), ISO 6506 (Brinell hardness)
- ISO 9443 (surface quality for hot‑rolled round bars)
- ISO/TR 9769, ISO 4948 (classification and analysis guidance)
ISO 11692:1994 is a prescriptive reference when ordering or producing ferritic‑pearlitic steels intended for hot working and subsequent precipitation hardening, ensuring consistent composition, mechanical performance and traceability.