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UNE FG25 grey iron is a common material, and its application is very wide, but its total production volume is not large compared with other cast iron materials.
It is because its hardness is difficult to control in production. If the brinell hardness is higher than 200, then it will bring difficulty to drill and milling machining. Lower than 200 will cause the grade reduced to FG20.
Therefore, if FG20 could meet your requirements of application, then it will be the better choice than FG25.
Equivalent Grades for UNE FG25 Gray Cast Iron:
This material has equal cast iron grades in other countries, such as EN-GJL-250 in European, GG25 in Germany, HT250 in China, FC250 in Japan, ASTM A48 CLASS 35 in USA, G25 in Italy, FGL250 in France, T250 in Australia, O125 in Sweden or ISO GRADE 250.
The Chemical Composition for UNE FG25 Gray Cast Iron:
According to the related standards, the mechanical properties are the inspection standard. The iron foundries can adjust the chemical components according to their own experience.
Mechanical Properties for UNE FG25 Gray Cast Iron:
We summarize the mechanical properties of UNE FG25 gray cast iron according to EN-GJL-250 in European standard EN 1561.
Mechanical properties (measured on separately cast test pieces, Ø 30mm) |
Material designations as per UNE |
FG25 |
Matrix |
|
Pearlite |
Tensile strength |
N/mm2 |
250 to 350 |
Brinell hardness |
HBW |
180 to 255 |
0.1% proof strength |
N/mm2 |
165 to 228 |
Elongation to fracture |
% |
0.8 to 0.3 |
Compressive strength |
N/mm2 |
840 |
Flexural strength |
N/mm2 |
340 |
Modulus of elasticity (load-dependent) |
kN/mm2 |
103 to 118 |
Fatigue strength under reversed bending stress |
N/mm2 |
120 |
Compression-tention fatigue strength |
N/mm2 |
60 |
Fracture toughness |
MPa√m |
20 |
Application for UNE FG25 Gray Cast Iron:
Industrial parts, machinery parts, development components, valve elements, train, craft, hydraulic stress, agricultural machinery, maritime components, car elements, electric electricity fittings, food machinery, harness fittings, instruments, mining equipment parts. |
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