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ISO 185 JL 250 is a type of gray cast iron with good combination of strength and wear resistance.
This material grade possesses reasonable machinability and excellent surface finish. Noise and vibration damping are good in this grade.
Chemical Components of ISO 185 JL 250
Gray Iron Casting, no any standard mentioned the chemistry composition, so we only suggest the following chemistry based on actual production.
Carbon (C): 3.15-3.3%
Silicon (Si): 1.6-1.9%
Manganese (Mn): 0.6-0.8%
Phosphorus (P): 0.3% max
Sulfur (S): 0.12% max
The characteristics of ISO 185/JL/250 cast iron depend on the dimensions and shape of the graphite flakes.
Technological properties of ISO 185 JL 250 |
Machinability |
Excellent |
Wear resistance |
Excellent |
Induction or flame-hardening capacity |
Good |
Nitriding capacity |
Good |
Damping |
Excellent |
Weldability |
Only weldable using special electrodes |
Mechanical properties of ISO 185/JL/250 in separately cast test pieces with 30 mm as-cast diameter - from ISO 185:2020(E)
Characteristic |
Symbol |
SI-unit |
Material designation |
ISO 185/JL/250 |
Matrix structure |
Ferritic/pearlitic |
Tensile strength |
Rm |
MPa |
250 to 350 |
0,1% proof strength |
Rp0.1 |
MPa |
165 to 228 |
Compression strength |
|
MPa |
840 |
0,1% compression proof strength |
|
MPa |
325 |
Bending strength |
|
MPa |
415 to 580 (1,66 x Rm) |
Shear strength |
|
MPa |
290 |
Torsional strength |
|
MPa |
290 |
Modulus of elasticity |
E |
GPa |
103 to 118 |
Poisson’s ratio |
v |
- |
0,26 |
Bending fatigue strength |
|
MPa |
115 to 160 (0,46 x Rm) |
Fatigue limit under reversed tension-compression stresses |
|
MPa |
85 to 120 (0,34 x Rm) |
Torsional fatigue strength |
|
MPa |
95 to 135 (0,38 x Rm) |
Physical properties of ISO 185/JL/250 in separately cast test pieces with 30 mm as-cast diameter - from ISO 185:2020(E)
Characteristic |
Symbol |
SI-unit |
Material designationa |
ISO 185/JL/250 |
Density |
ρ |
kg/dm3 |
7,20 |
Specific heat capacity
between 20℃ and 200℃ |
c |
J/(kg K) |
460 |
between 20℃ and 600℃ |
535 |
Linear expansion coefficient
between -100℃ and +20℃ |
α |
µm/(m K) |
10,0 |
between 20℃ and 200℃ |
11,7 |
between 20℃ and 400℃ |
13,0 |
Thermal conductivity
at 100℃ |
λ |
W/(m K) |
48,5 |
at 200℃ |
47,5 |
at 300℃ |
46,5 |
at 400℃ |
45,0 |
at 500℃ |
44,5 |
Resistivity |
ρ |
Ω mm2/m |
0,73 |
Coercivity |
HO |
A/m |
560 to 720 |
Maximum permeability at room temperature |
μ |
μH/m |
220 to 330 |
Hysteresis losses at B = 1 T |
|
J/m3 |
2500 to 3000 |
Approximate cross-reference of ISO 185/JL/250 grade designations to other standard grades of grey cast irons - from ISO 185:2020(E)
Wordwide cast iron equivalent grades for ISO 185 JL250
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) |
35
35B |
0.6025
GG25 |
FC250 |
FGL250
Ft25D |
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 |
FG260 |
GG25 |
GG30 |
FC250 |
FGG25 |
FG250 |
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