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ISO 185 JL 300 cast iron is a grey iron which contains graphite in the form of flakes.
Gray iron is more brittle than SG iron but offers good compressive strength and also good damping characteristics.
In common with all grey iron grades, ISO 185 JL 300 has good machinability. The graphite offers lubricating properties which has advantages in sliding wear applications.
Chemical Components of ISO 185 JL 300
Gray Iron Casting, no any standard mentioned the chemistry composition, so we only suggest the following chemistry based on actual production.
Carbon 2.9-3.1%
Silicon 1.8-2.0%
Mangenese 0.7-0.9%
Sulphur 0.10% max
Phosphorous 0.10% max
Cu or Ni 0.3-0.5%
Technological properties of ISO 185 JL 300 |
Machinability |
Excellent |
Wear resistance |
Excellent |
Induction or flame-hardening capacity |
Excellent |
Nitriding capacity |
Excellent |
Damping |
Excellent |
Weldability |
Only weldable using special electrodes |
Mechanical properties of ISO 185/JL/300 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/300 |
Matrix structure |
pearlitic |
Tensile strength |
Rm |
MPa |
300 to 400 |
0,1% proof strength |
Rp0.1 |
MPa |
195 to 260 |
Compression strength |
|
MPa |
960 |
0,1% compression proof strength |
|
MPa |
390 |
Bending strength |
|
MPa |
480 to 640 (1,60 x Rm) |
Shear strength |
|
MPa |
345 |
Torsional strength |
|
MPa |
345 |
Modulus of elasticity |
E |
GPa |
108 to 137 |
Poisson’s ratio |
v |
- |
0,26 |
Bending fatigue strength |
|
MPa |
140 to 185 (0,46 x Rm) |
Fatigue limit under reversed tension-compression stresses |
|
MPa |
100 to 135 (0,34 x Rm) |
Torsional fatigue strength |
|
MPa |
115 to 150 (0,38 x Rm) |
Physical properties of ISO 185/JL/300 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/300 |
Density |
ρ |
kg/dm3 |
7,25 |
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) |
47,5 |
at 200℃ |
46,0 |
at 300℃ |
45,0 |
at 400℃ |
44,0 |
at 500℃ |
43,0 |
Resistivity |
ρ |
Ω mm2/m |
0,70 |
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/300 grade designations to other standard grades of grey cast irons - from ISO 185:2020(E)
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