ISO/TR 15608 Material Group 72.3

Material Group 72.3 ISO/TR 15608: Spheroidal graphite cast iron, EN-GJS-500-7 and EN-GJS-450-10 (if > 20% perlite) or specified Brinell hardness

Features

Spheroidal graphite cast iron also known as ductile iron, ductile cast iron, nodular cast iron, or spheroidal graphite iron. While most varieties of cast iron are brittle, spheroidal graphite cast iron has much more impact and fatigue resistance, due to its nodular graphite inclusions.

Micro structure

The ferritic microstructure consists of body-centered cubic α-iron. This phase is very tough and ductile, but is characterised by limited strength and low hardness. Perlite is a lineal microstructure consisting of alternating layers of ferrite and cementite (Fe₃C). In contrast to ferrite, this phase is very strong and characterised by high hardness and high wear resistance. However, its malleability is low.

Ferrite forms the basis of the ductile, lower-strength cast iron grades, while the higher-strength grades are predominantly perlitic. The different transition qualities are created by combining different proportions of both structures (ferritic/perlitic or perlitic/ferritic).

Typical materials in group 72.3

Name	Number	Standards	Remarks
EN-GJS-350-22-LT	EN-JS1015	EN 1563	AD 2000 EN 13445-6 EN 12953: Valve DN ≤200, PS≤40 bar, TS≤350°C
EN-GJS-400-15	EN-JS1030	EN 1563	AD 2000 EN 12953: Valve DN ≤200, PS≤40 bar, TS≤350°C
EN-GJS-400-18-LT	EN-JS1025	EN 1563	AD 2000 EN 13445-6 EN 12953: Valve DN ≤200, PS≤40 bar, TS≤350°C
EN-GJS-450-10	EN-JS1040	EN 1563	–
EN-GJS-500-7	EN-JS1050	EN 1563	AD 2000
EN-GJS-600-3	EN-JS1060	EN 1563	AD 2000
EN-GJS-700-2	EN-JS1070	EN 1563	AD 2000