The classification, chemical composition, mechanical properties,
hardness, technological properties,physical
properties,Equivalent steels, specification of grey cast iron
grade SCH25, СЧ25.
Grade: |
SCH25 ( СЧ25 ) |
Classification: |
Gray cast iron |
Chemical composition in % for grade SCH25 (
СЧ25)
C |
Si |
Mn |
S |
P |
3.2-3.4 |
1.4-2.2 |
0.7-1 |
max 0.15 |
max 0.2 |
Mechanical properties under Т=20oС for grade
SCH25 ( СЧ25)
Assortment |
Dimension |
Direct |
sB |
sT |
d5 |
y |
KCU |
Heat treatment |
- |
mm |
- |
MPa |
MPa |
% |
% |
KJ/m2 |
- |
Casting,GOST1412-85 |
|
|
250 |
|
|
|
|
|
Brinell hardness for SCH25 ( СЧ25
) GOST 1412-85 |
HB 10 -1= 156 - 260 MPa |
Technological properties of the material
SCH25 ( СЧ25 )
Physical properties for grade SCH25 ( СЧ25 )
T |
E 10- 5 |
a 10 6 |
l |
r |
C |
R 10 9 |
Grade |
MPa |
1/Grade |
Watt/(m·Grade) |
kg/m3 |
J/(kg·Grade) |
Ohm·m |
20 |
1 |
|
50 |
7200 |
|
|
100 |
|
10 |
|
|
500 |
|
Equivalent steels for grade SCH25 ( СЧ25 )
USA |
- |
A48-40B |
Class35B |
No.35 |
Germany |
DIN,WNr |
GG25 |
Japan |
JIS |
FC25 |
FC250 |
|
France |
AFNOR |
|
FGL250 |
|
England |
BS |
250 |
260 |
|
Italy |
UNI |
G25 |
Belgium |
NBN |
FGG25 |
Spain |
UNE |
FG25 |
China |
GB |
HT250 |
Sweden |
SS |
0125-00 |
O125 |
|
Poland |
PN |
Z125 |
ZI250 |
|
Czechia |
CSN |
422425 |
Austria |
ONORM |
GG25 |
GG250 |
|
Inter |
ISO |
250 |
Taiwan |
- |
FC250 |
COPANT |
COPANT |
FG250 |
Specification:
Mechanical properties:
sв - Tensile strength, [MPa]
sT - Yield stress, [MPa]
d5 - Specific elongation at fracture [%]
y - Reduction of area, [%]
KCU - Impact strength, [kJ/ m2]
HB - Brinell hardness, [MPa]
Physical properties:
T - Test temperature, [Grade]
E - Young modulus, [MPa]
a - Coefficient of linear expansion (range 20o - T) , [1/Grade]
l - Termal (heat) condition coefficient, [Watt/(m·Grade)]
r - Density, [kg/m3]
C - Specific heat (range 20o - T), [J/(kg·Grade)]
R - Electrical resistance, [Ohm·m]
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