|
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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