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    BS 1452, Flake Graphite Cast Iron Properties

 
This British standard specifies minimum tensile strengths of eight grades of flake graphite cast iron as determined on test pieces from separately cast test samples. It does not specify the properties of castings made in the material.

When tested in accordance with appendix A the minimum tensile strength of the specimen shall be as given in table 1.

 

Table 1. Minimum tensile strengths of test pieces machined from separately cast test samples

grade

Minimum tensile strength Rm(min)


100
150
200
220
250
300
350

N/mm2
100
150
180
200
250
300
350

Note. The results obtained against any particular grade may be deemed acceptable if the specified minimum strength is exceeded by up to 100 N/mm2

 

 

The dimensions of the test piece are as given in table 2.

 

Table2. Dimensions of tensile test pieces ( see figure 2)

Dimension

size

Machining tolerance

Minimum parallel length (Lc)

mm 55

mm none

Gauge diameter ( d0 )

20

±0.5

Radius ( R )

25

+5

-0

Plain ends

Minimum diameter (d1)

25

none

Minimum length ( Lp)

65

none

Threaded ends

Minimum diameter at root of thread (d2 )

25

none

Minimum length (Ls)

30

none

 

The cooling rate of cast-on samples will be more representative of the cooling rate of a casting than a separately cast test sample when the casting thickness is greater than 20mm and its mass greater than 20kg.

 

Table 3 Expected tensile strengths of test pieces machined from cast- on test samples and from the castings

Grade

Casting section thickness

Tensile strength

over

Up to and including

Cast-on test samples

castings

100

mm
2.5
10

mm
10
20

N/mm2
-
-

N/mm2
120
90

150

2.5
10
20
40
80
150

10
20
40
80
150
300

-
-
120
110
100
90

155
130
110
95
80
-

180

2.5
10
20
40
80
150

10
20
40
80
150
300

-
-
150
135
125
100

185
160
135
115
100
-

200

2.5
10
20
40
80
150

10
20
40
80
150
300

-
-
170
150
140
130

205
180
155
130
115
-

220

2.5
10
20
40
80
150

10
20
40
80
150
300

-
-
175
165
150
140

220
195
170
145
130
-

250

5
10
20
40
80
150

10
20
40
80
150
300

-
-
210
190
170
160

250
225
195
170
155
-

300

10
20
40
80
150

20
40
80
150
300

-
250
220
210
190

270
240
210
195
-

350

10
20
40
80
150

20
40
80
150
300

-
290
260
230
210

315
280
250
225
-

 

The expected ranges of Brinell hardness for various casting section sizes are given in table 4.

 

Table 4 Expected brinell hardness ranges for different casting section sizes

Grad

Section thickness (in mm)

Expected brinell hardness ranges

100

2.5-5
5-10
10-20
20-40
40-80

210
185
170
160
150

150

2.5-5
5-10
10-20
20-40
40-80

260 to 170
225 to 140
205 to 125
185 to 110
170 to 100

200

2.5-5
5-10
10-20
20-40
40-80

280
260 to 170
230 to 150
210 to 135
190 to 120

250

2.5-5
5-10
10-20
20-40
40-80

-
280 to 200
250 to 180
235 to 160
220 to 145

300

2.5-5
5-10
10-20
20-40
40-80

-
-
280 to 200
255 to 180
240 to 165

350

2.5-5
5-10
10-20
20-40
40-80

-
-
-
280 to 200
260 to 185

 

 

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