250 / BS 1452
250
BS 1452
General
GRADE 250 IS A GREY CAST IRON, ALSO KNOWN AS FLAKE GRAPHITE IRON, DUE TO THE PRESENCE OF GRAPHITE IN FLAKE FORM THROUGHOUT ITS STRUCTURE. THIS MATERIAL OFFERS GOOD COMPRESSIVE STRENGTH AND EXCELLENT DAMPING CHARACTERISTICS, MAKING IT IDEAL FOR REDUCING VIBRATION AND NOISE.LIKE ALL GREY IRON GRADES, EN-GJL-250 IS READILY MACHINABLE. THE GRAPHITE CONTENT ALSO PROVIDES NATURAL LUBRICATING PROPERTIES, OFFERING ADVANTAGES IN SLIDING WEAR APPLICATIONS.
Uses
GLASS & PLASTIC INDUSTRIES, PISTONS, MOULDS, DIES, BEARINGS, CAMS, BUSHES & GEARS
Heat Treatment & Condition
-
Chemical Analysis
C
·
2.90-3.65
Mn
·
0.40-0.70
P
·
0.30 MAX
Si
·
1.80-2.90
S
·
0.10 MAX
| C | Mn | P | Si | S |
|---|---|---|---|---|
| 2.90-3.65 | 0.40-0.70 | 0.30 MAX | 1.80-2.90 | 0.10 MAX |
Typical Mechanical Properties (EXAMPLE ONLY)
TEN. STRENTH
250-350 MPa
YIELD STRESS
300 N/MM2
ELONG
21%
HARDNESS
145-240 HB
| TEN. STRENTH | YIELD STRESS | ELONG | HARDNESS |
|---|---|---|---|
| 250-350 MPa | 300 N/MM2 | 21% | 145-240 HB |