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ISO 185 : 1988 for Gray Cast Iron

ISO 185 is a standard for gray cast iron. It includes the tensile strength and hardness of gray iron. This standard can be a good reference for designers, buyers and suppliers to gray iron castings.  

The grade of gray cast iron and the tensile strength of Cast integral test bar and castings

 
Grade

Tensile strength of Cast integral test bar
σb≥/Mpa

Castings

Thickness
/mm

Tensile strength
σb≥/Mpa

100

100

2.5~10
10~20

120
90

150

150

2.5~10
10~20
20~30
30~50

155
130
115
105

200

200

2.5~10
10~20
20~30
30~50

205
180
160
145

250

250

4.0~10
10~20
20~30
30~50

250
225
205
185

300

300

10~20
20~30
30~50

270
245
225

350

350

10~20
20~30
30~50

315
290
270

 
Tensile strength of test bar made from attached specimen of gray cast iron

Grade

Thickness of cross section of castings
/mm

Tensile strength
σb≥/Mpa

Attached specimen

On castings
parameter

 

φ30mm

φ50mm

100

150

20
40
80
150

40
80
150
300

120
110
 

 
 
100
90

110
95
80

200

20
40
80
150

40
80
150
300

170
150
 

 
 
140
130

155
130
115

250

20
40
80
150

40
80
150
300

210
190
 

 
 
170
160

195
170
155

300

20
40
80
150

40
80
150
300

250
220
 

 
 
210
190

240
210
195

350

20
40
80
150

40
80
150
300

290
260
 

 
 
230
210

280
250
225

 
Hardness range of gray cast iron

Hardness grade

Hardness range on castings
HBS

H145
H175
H195
H215
H235
H255

≤170
150~200
170~220
190~240
210~260
230~280

 

Cross-references of ISO 185 grade designations to other standards

Table 1 provides a selection of approximate cross-references of ISO 185 grade designations to standard grades of cast iron according to the previous (1988) edition of ISO 185 and to standard grades from current EN, ASTM, JIS, and SAE specifications for grey cast iron.

Because SAE specifies grey cast-iron grades by a combination of minimum test-bar tensile-strength-to-hardness ratio and minimum casting hardness, SAE J431 grades, in addition to those shown, may also be produced to meet a grade specified only by tensile strength. Because SAE hardness grades specify minimum casting hardness, a direct correlation between SAE J431 and ISO 185 hardness grades is not possible;

Table D.1 shows SAE grades which have minimum hardness values approximately the same as ISO grades.

Because ISO 185:1988 hardness grades did not differentiate between expected values for different relevant wall thickness, it is possible that more than one of the previous ISO hardness grades may satisfy the requirements of the current grades.

Table D.1 - Approximate cross-references of ISO 185 grade designations to other standard grades of grey cast iron

ISO 185:2004

ISO 185:1988

EN 1561

ASTM A48

JIS G5501

SAE J431

ISO 185/JL/150

150

EN-GJL-150

150

FC150

G9H12

ISO 185/JL/200

200

EN-GJL-200

200

FC200

G10H18

ISO 185/JL/225

 - 

 - 

225

 - 

G10H21 G11H18

ISO 185/JL/250

250

EN-GJL-250

250

FC250

G11H20

ISO 185/JL/275

 - 

 - 

275

 - 

G12H21 G13H19

ISO 185/JL/300

300

EN-GJL-300

300

FC300

G13H22

ISO 185/JL/350

350

EN-GJL-350

350

FC350

G13H24

ISO 185/JL/HBW155

H145

EN-GJL-HB155

 - 

 - 

H10

ISO 185/JL/HBW175

H175

EN-GJL-HB175

 - 

 - 

H11

ISO 185/JL/HBW195

H175 H195

EN-GJL-HB195

 - 

 - 

H13 H14

ISO 185/JL/HBW215

H175 H195 H215

EN-GJL-HB215

 - 

 - 

H16

ISO 185/JL/HBW235

H195 H215 H235

EN-GJL-HB235

 - 

 - 

H18

ISO 185/JL/HBW255

H215 H235 H255

EN-GJL-HB255

 - 

 - 

H20

 

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