EN-GJL-250, CAST IRON GG25
EN-GJL-250 is a high material grade of
grey cast iron in European
standard EN 1561, it is also named as cast iron GG25 in standard DIN
1691 by Germany and Austria.
The followings are its equivalent grades, chemical composition,
mechanical properties, and some photos of grey iron castings made by
EN-GJL-250, GG25 Equivalent Grades
Besides GG25 in standard DIN 1691,
this grade is also equivalent to the following grades:
ISO 185 - Class 250
GB 9439 - HT250 in China
ASTM A48 - Class 35 in USA
UNI 5007 - G25 in Italy
UNF - FG25 in Spain
AS 1830 - T250 in Australia
NS11 100 - SJG250 in Norway
EN-GJL-250, GG25 Chemical Composition
The normal chemical composition should be C = 2.8-3.3, Si = 1.2-1.7,
Mn = 0.8-1.2, P ≤ 0.15, S ≤ 0.12.
Please notice, the chemical composition can not be taken as material
quality inspection standard. In all standards, the chemical
composition is just for reference. The grey iron foundries could
adjust their composition according to their own production condition
and experience, as long as they could guarantee to meet the
mechanical properties, which is the only inspection standard.
However, if the iron castings need to meet special application, so
will require the specific chemical composition, then the buyers
should denote this requirement clearly, and the grey iron foundries
should take it as the quality standard.
EN-GJL-250, GG25 Mechanical Properties
Tensile Strength ≥ 250 Mpa
Yield Strength: No Requirement.
Hardness Range: 190 to 240 BH
Only the tensile strength is the quality inspection standard. Other
mechanical properties are only for reference unless the buyers have
EN-GJL-250, GG25 Grey Iron Castings
This grade has comparatively high
tensile strength, and will not need additional heat treatment, so
its production cost is still kept low. However, its hardness is
comparatively high, so as for the castings parts with thin wall
thickness, the hardness for some positions will be very high, over
200 BH, therefore, will cause difficulty to machining, especially to
drilling and milling.
Moreover, will cause the casting parts more crispy. So, if the lower
tensile strength could meet your use, better to choose lower grade