Spheroidal graphite iron (GJS)

Spheroidal graphite iron (GJS): excellence in the tradition of Zanardi Fonderie

Spheroidal graphite iron (GJS): quality guaranteed by ongoing investment in research and innovation

Ductile iron castings by Zanardi Fonderie have forever been recognised in the market as products par excellence and are used to manufacture mechanical parts for agricultural and earth moving machinery, for off-road and on-road vehicles, railroad cars (barber bogies), hydraulic and fluid power applications.

Our company successfully manufactures all grades of spheroidal graphite iron according to international standards (ISO 1083, EN 1563, FIAT 52215, ASTM A536), and also ferritic ductile iron with guaranteed resistance at low temperatures (in grades EN-GJS-400-18LT and GGG40.3).

In accordance with the most up-to-date version of EN 1563, we also offer the market new grades of solid-solution strengthened ferritic ductile iron, also known as high silicon ductile iron.

Characteristics of spheroidal graphite iron GJS

Spheroidal graphite iron (GJS) is characterised by the spherical shape of the graphite nodules offering the material enhanced mechanical strength and toughness, which over the past few decades has allowed its broad-ranging use in the most varied fields of application and market sectors. Thanks to the controlled microstructure, the family of ductile irons produced by Zanardi Fonderie is characterised by an exceedingly broad range of grades, thus satisfying all design requirements.

Benefits and mechanical and dynamic properties of spheroidal graphite iron GJS

Resistance and ductility are two of the most important characteristics of ductile iron (GJS). Thanks also to the spheroidal shaped graphite nodules, spheroidal graphite iron (GJS) not only boasts superior mechanical properties with respect to grey cast iron, but is also higher performing and more ductile. Unlike the flake-like structure of grey cast iron, the spheroids of ductile iron GJS inhibit the spread of cracks, thus making it possible to obtain parts that are more resistant and high-performing over time.

Applications in spheroidal graphite iron GJS

Parts in ductile iron (GJS) are used in many mechanical applications such as the undercarriages of earth moving machinery and agricultural machinery, planetary gear reducers, transmissions, off-road and on-road vehicle suspension systems, railroad cars (barber bogies) and hydraulic and fluid power applications.

Spheroidal graphite iron GJS: a valid alternative to hardened steels

Thanks to melting technology and excellent castability, the use of ductile iron (GJS) represents a valid alternative to steel because it allows the material to be applied only where needed, thus limiting the number of processes necessary to obtain the desired complex design shapes, while at the same time allowing considerable cost and material savings.

Many years of experience, proven reliability and investments in the search for innovative solutions have led to the development of a solid, integrated process, allowing us to supply clients with cast parts in ductile iron ready for use.

Mechanical properties Spheroidal graphite iron GJS

Mechanical properties – Spheroidal graphite iron

EN 1563:2018
EN-GJS-350-22-LT
EN-GJS-350-22-RT
EN-GJS-350-22
EN-GJS-400-18-LT
EN-GJS-400-18-RT
EN-GJS-400-18
EN-GJS-400-15
EN-GJS-450-10
EN-GJS-500-7
EN-GJS-600-3
EN-GJS-700-2
EN-GJS-800-2
EN-GJS-900-2
Tensile strength Rm
(N/mm2 min)
350
350
350
400
400
400
400
450
500
600
700
800
900
Proof Strenght
Rp0,2 (N/mm2 min)
220
220
220
240
250
250
250
310
320
370
420
480
600
Elongation A5
(% min)
22
22
22
18
18
18
15
10
7
3
2
2
2
Brinell Hardness
<160
<160
<160
130-175
130-175
130-175
135-180
160-210
170-230
190-270
225-305
245-355
270-360

The values reported into the table are relative to separately cast samples and having relative wall thickness 30 mm.

Mechanical properties – solid-solution strengthened ferritic spheroidal graphite cast irons

EN 1563:2018
EN-GJS-450-18
EN-GJS-500-14
EN-GJS-600-10
Tensile strength Rm
(N/mm2 min)
450
500
600
Proof Strenght
Rp0,2 (N/mm2 min)
350
400
470
Elongation A5
(% min)
18
14
10
Brinell Hardness
170-200
185-215
200-230

The values reported into the table are relative to separately cast samples and having relative wall thickness 30 mm.

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