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  DIN 1691 GG25 Gray Cast Iron  
 

The followings are the chemical composition, material properties and main application of gray cast iron DIN1691 GG25.

Characteristics of DIN 1691 GG25 Gray Cast Iron:
DIN 1691 GG25 Gray Cast Iron is the most commonly used cast iron alloy. This material offers a good combination of strength and wear resistance, while still possessing good machinability and produces excellent surface finishes. Noise and vibration damping are excellent in this grade.

Chemical Composition of DIN 1691 GG25 Gray Cast Iron:

Carbon

C

3.00-3.25

[%]


Silicon

Si

1.85-2.10

[%]


Manganese

Mn

0.40-0.70

[%]


Sulphur

S

0.12 max

[%]


Phosphorus

P

0.25 max

[%]


Iron

Fe

Balance

As for normal grey iron, the chemical composition is not important comparatively. The iron foundries could adjust the compositions according to their experience as long as they could meet the physical and mechanical requirements.

Physical Properties of DIN 1691 GG25 Gray Cast Iron:
Density ρ 7.2 g/cm³ at 20 °C
Thermal Specific heat capacity cp 460 J/(kg.K) at 200 °C
Electrical resistivity ρel 7.3E-7 Ω.m at 20 °C

Mechanical Properties of DIN 1691 GG25 Gray Cast Iron:

Tensile strength

σ B

250

[N/mm2]


Elongation

A

0.3-0.8

[%]


Permanent limit of elongation

σ bB

450

[N/mm2]


Compressive Strength

σ dB

950

[N/mm2]


Brinell hardness

HB30

180-240

[Kg/mm2]


Elasticity modulus

Eo

110

[kN/mm2]


Shear stress

σaB

290

[N/mm2]

Main Applications of DIN 1691 GG25 Gray Cast Iron:

  • Sliding parts
  • Pulleys and hydraulic distribution blocks (good machinability)


Worldwide equivalents of DIN 1691 GG25 Gray Cast Iron:

EU
EN

USA
-

Germany
DIN,WNr

Japan
JIS

France
AFNOR

England
BS

Italy
UNI

Belgium
NBN

Spain
UNE

China
GB

Sweden
SS

Bulgaria
BDS

Hungary
MSZ

EN-GJL-250 (EN-JL1040)

250/275
35
35B
40
40B

0.6025
GG25

FC250

FGL250
Ft25D

250
260
Grade220
Grade260

G25

FGG25

FG25

HT25-47
HT250

01-25-00
0125

Vch25

OV25


Poland
PN

Romania
STAS

Austria
ONORM

Australia
AS

Norway
NS

Russia
GOST

Inter
ISO

India
IS

Netherlands
NEN

Denmark
DS

Taiwan
-

Luxembourg
-

COPANT
-

Z125

FC250

GG25

T260

SJG250

SCH25

250
JL250

FG260

GG25

GG30

FC250

FGG25

FG250

 

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