BS1452 Grade 250 gray cast iron is suited for applications requiring good wearing characteristics and good strength.
This material has higher tensile strength than Grade 200, so it will be a good choice if your castings need high tensile strength.
Chemical Analysis of BS1452 250 Grey Cast Iron(mass fraction)(%)
Carbon |
2.90-3.65% |
Phosphorous |
0.30% max |
Manganese |
0.40-0.70% |
Sulphur |
0.10% max |
Silicon |
1.80-2.90% |
Iron |
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.
Typical Properties of BS1452 250 Grey Cast Iron
Typical Tensile range of material (subject to section) N/mm² 155-195
Typical Hardness HB 145-240
Mechanical properties shown are typical and may vary subject to the size and section of this cast iron grade.
Tensile Strength of Gray Iron Casting in BS 1452 Grade 250
Grade |
Wall Thickness of Casting
/mm |
Tensile Strength σb≥/Mpa |
Test Bar with Casting |
Casting |
250 |
5~10
10~20
20~40
40~80
80~150
150~300 |
—
—
210
190
170
160 |
250
225
195
170
155
— |
Equivalent Grades of BS1452 250 Gray Cast Iron:
Country |
Standard |
Material Grade |
|
ISO |
ISO 185 |
GRADE 250 |
|
China |
GB 9439 |
HT250 |
|
USA |
ASTM A48 |
CLASS 35 |
|
Germany / Austria |
DIN 1691 |
GG25 |
|
European |
EN 1561 |
EN-GJL-250 |
|
Japan |
JIS G5501 |
FC250 |
|
Italy |
UNI 5007 |
G25 |
|
France |
NF A32-101 |
FGL250 |
|
UK |
BS 1452 |
250, 260 |
|
Spain |
UNF |
FG25 |
|
Belgium |
NBN 830-01 |
FGG25 |
|
Australia |
AS 1830 |
T250, T260 |
|
Sweden |
SS 14 01 |
O125 |
|
Norway |
NS11 100 |
SJG250 |
|
