ISO 2892:2007

Overview - ISO 2892:2007 (Austenitic cast irons - Classification)

ISO 2892:2007 specifies the classification and requirements for austenitic cast irons. The standard defines material grades by graphite form (flake/lamellar or spheroidal/nodular), matrix structure (austenitic), chemical composition, and mechanical properties obtained from representative test samples. It is intended for high-alloy cast irons used where heat resistance, corrosion resistance, low-temperature performance, special physical or wear properties are required.

Key topics and technical requirements

• Grade designation and identification
  • Material symbols and grade names are defined (see Tables 1–4). Designations follow ISO TR 15931 guidance.
• Graphite form and matrix
  • Distinguishes flake (lamellar) and spheroidal (nodular) graphite in an austenitic matrix.
• Chemical composition
  • Composition limits for engineering and special-purpose grades are given (nickel, manganese, silicon, chromium, copper, phosphorus and optional elements such as niobium or molybdenum).
  • Tables specify allowable ranges for each grade.
• Mechanical properties and testing
  • Tensile strength, 0.2% proof stress, elongation and Charpy impact values are prescribed and must be determined from separately cast test samples (unless otherwise agreed).
  • Tensile testing is to follow ISO 6892 and Charpy impact testing is referenced (ISO 148-3).
• Sampling and test-piece production
  • Guidance on sample types: separately cast samples, cast-on samples, or samples cut from castings depending on casting mass/thickness.
  • Frequency of sampling is based on manufacturer QA or agreement with purchaser.
• Manufacture and heat treatment
  • Production methods and heat treatments are generally at the manufacturer’s discretion unless purchaser specifies otherwise. Annex B provides typical heat treatments.
• Ordering information
  • Purchasers must specify complete grade designation and any special requirements at order acceptance.

Applications and intended users

• Typical users:
  • Foundries, casting engineers, material specifiers, procurement professionals, design engineers in oil & gas, chemical processing, power generation, and cryogenics.
• Typical applications:
  • Components requiring corrosion resistance, heat resistance, low-temperature toughness, or specific wear/physical properties (see Annex A for grade-specific recommendations).
• Benefits:
  • Ensures material interchangeability, quality verification, and suitable performance for pressure and specialty applications.

Related standards and references

• ISO 6892 - Metallic materials - Tensile testing
• ISO 148-3 (referenced) - Charpy pendulum impact test procedures
• ISO TR 15931 - Designation system for cast irons and pig irons

For specification or procurement, reference ISO 2892:2007 to select the correct austenitic cast-iron grade and to align testing, sampling and documentation with international practice.