FLAKE GRAPHITE / GREY IRONS

The Metallurgy of MEEHANITE Flake (Grey/Lamellar) Iron

In the production of Meehanite flake graphite castings, the composition of the iron, whilst important, is only a part of the process for achieving a definite metal structure. The more important factor is mass, ie wall section thickness, and its effect on cooling rates. For normal cast iron, slow cooling (as in thick sections) produces a coarse open-grained, low strength structure, whereas fast cooling (as in thin sections) results in a hard, brittle, unmachinable structure. Thus in Meehanite practice, the structure of the metal and properties required are related to the section thickness of the casting.

For more information on this subject why not email us and ask for a copy of the brochure:
"MEEHANITE Flake Graphite Irons for General Engineering Applications"
 
   


Typical Mechanical and Physical Properties
(from separately cast test bars of 30mm diameter)
MEEHANITE
TYPE
Tensile Strength (min) N/mm² 0.1% Proof Stress (min) N/mm² Elongation % Brinell Hardness HB30 Strength N/mm²
Compressive Bending
GF150

GE200

GE225

GD250

GC275

GB300

GA350

GM400
150-250

200-300

225-325

250-350

275-375

300-400

350-450

400+
98-165

130-195

147-212

165-228

180-244

195-260

228-285

260+
0.8-0.3

0.8-0.3

0.8-0.3

0.8-0.3

0.8-0.3

0.8-0.3

0.8-0.3

0.8-0.3
160-190

180-220

185-225

190-230

195-235

200-240

210-250

210-260
600

720

780

840

900

960

1080

1200
250

290

315

340

365

390

490

590

Technical Data on Strength v. Section

MEEHANITE
TYPE
Tensile Strength in Separately cast 30mm test bars N/mm² Approximate values in relation to wall section
Wall Section mm

from/to
Tensile Strength in cast-on test bars N/mm² Tensile Strength N/mm² Brinell Hardness HB30
GF150 150 2.5 / 5
5 / 10
10 / 20
20 / 40
-
-
-
-
210
180
140
120
250
225
205
185
GE200

GE225
200

225
2.5 / 5
5 / 10
10 / 20
20 / 40
-
-
-
180
240
220
190
170
270
245
220
200
GD250 250 5 / 10
10 / 20
20 / 40
40 / 80
-
-
230
210
275
240
220
200
270
250
230
215
GC275


GB300
275


300
10 / 20
20 / 40
40 / 80
80 / 150
150 / 300
-
280
250
230
210
290
265
235
210
190
260
240
230
215
205
GA350 350 10 / 20
20 / 40
40 / 80
80 / 150
150 / 300
-
320
300
275
250
340
310
275
250
225
275
260
240
225
215
GM400 400 15 / 20
20 / 40
40 / 80
80 / 150
150 / 300
-
370
350
325
300
390
350
315
280
255
285
270
250
235
225

 


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