Overview
ISO 9725:2017 - Nickel and nickel alloy forgings specifies requirements for nickel and nickel‑alloy forgings intended for general purposes. The standard defines alloy identification rules, required purchaser information, composition limits, mechanical properties, heat‑treatment conditions and factory and purchaser responsibilities for testing, sampling, marking and certification. It is the second edition (2017) and replaces the 1992 edition with technical revisions.
Key topics and technical requirements
- Alloy identification and composition: Principles for alloy designation are given (Annex A). Composition limits and density data are referenced in Table 1; composition must be verified by chemical analysis (one analysis per heat).
- Information to be supplied by the purchaser: Buyers must specify ISO 9725, quantity, alloy name/number, temper, drawing/tolerances, heat‑treatment responsibility and any optional requirements (e.g., hardness acceptance, sample types, surface condition).
- Heat treatment and temper: Forgings are normally supplied annealed, solution‑treated or solution‑and‑precipitation‑treated unless hot‑finished temper is required. Precipitation‑hardenable alloys have specific solution and ageing instructions (Table 3).
- Mechanical properties and testing: Tensile, creep and stress‑rupture properties are specified (Table 2 and Table 4). Tensile tests follow ISO 6892‑1/6892‑2; creep/stress‑rupture follow ISO 204. One mechanical test per lot is typical; tensile specimens should not exceed 15 mm diameter.
- Sampling options: Separate test samples, integral extensions, or specimens machined from forgings are permitted; sampling location is usually at supplier’s option unless otherwise specified.
- Quality acceptance and retest rules: Hardness may be used as an alternate acceptance criterion if agreed. Retest procedures are defined when initial tests fail. Rounding rules for reporting results are specified.
- Marking, inspection and conformity: Marking and shipping‑container information, purchaser/third‑party inspection arrangements, and declaration of conformity (including heat‑treatment and test results) are covered.
Applications
ISO 9725:2017 is applicable to general‑purpose nickel and nickel‑alloy forgings used where corrosion resistance, high‑temperature strength or specific metallurgical properties are required. Typical practical uses include components for chemical processing, oil & gas, power generation and other industrial sectors needing reliable forged nickel alloys.
Who uses this standard
- Forging manufacturers and metallurgical engineers
- Procurement and quality managers specifying forgings
- Third‑party inspectors and testing laboratories
- Design and R&D teams working with nickel alloys
Related standards
ISO 9725 references and aligns with normative test methods including:
Keywords: ISO 9725:2017, nickel forgings, nickel alloy forgings, forgings specification, material composition, tensile properties, heat treatment, chemical analysis, grain size, quality control.
