ISO 3755 1991 cast
carbon steels for general engineering purposes
This international standard specifies
requirements for eight grades of heat-treated cast carbon steels for
general engineering purposes. They are grade 200-400, 200-400W,
230-450, 230-450W, 270-480, 270-480W, 340-550 and 340-550W. Four of
the grades have a restricted chemical composition to ensure uniform
weld ability.
Steel used for castings shall conform to the mechanical property
requirements given in the following table.
Either reduction of area or impact strength shall be determined and
shall conform to the requirements given for the grade in this table.
The choice of test will be at the discretion of the manufacturer,
unless it is specified by the purchaser at the time of ordering.
Mechanical Property Requirements of Cast Steel Grades on ISO
3755:
|
Grades |
Specimen/mm |
Mechanical
Properties |
|
σs /MPa |
σb /MPa |
δ ≥ (%) |
φ ≥(%) |
A KV / J |
|
200-400
200-400W |
28
28 |
200
200 |
400~500
400~500 |
25
25 |
40
40 |
30
45 |
|
230-450
230-450W |
28
28 |
230
230 |
450~600
450~600 |
22
22 |
31
31 |
25
45 |
|
270-480
270-480W |
28
28~40
28
28~40 |
270
260
270
260 |
480~630
500~650
480~630
500~650 |
18
-
18
- |
25
-
25
- |
22
-
22
- |
|
340-550
340-550W |
28
28~40
28
28~40 |
340
300
340
300 |
550~700
570~720
550~700
570~720 |
15
-
15
- |
21
-
21
- |
20
-
20
- |
The steel
used for castings shall conform to the chemical composition
requirements in this following table.
The choice
of chemical composition in the non-wieldable grades shall be left to
the discretion of the manufacturer. For each 0.01% reduction of
carbon below 0.25%, an increase of 0.04% manganese above the maximum
specified will be permitted, to a maximum of 1.20% for grade
200-400W and to 1.40% for grade 270-480W.
Maximum
content of residual elements, the sum of which shall not exceed
1.00%.
Chemical
Composition Requirements of Cast Steel Grades on ISO 3755:
|
Grades |
C |
Si |
Mn |
P ≤ |
S ≤ |
Cr |
Ni |
Mo |
Others |
|
200-400
200-400W |
-
≤0.25 |
-
≤0.60 |
-
≤1.00 |
0.035
0.035 |
0.035
0.035 |
-
≤0.35 |
-
≤0.40 |
-
≤0.15 |
-
Cu≤0.40
V≤0.05 |
|
230-450
230-450W |
-
≤0.25 |
-
≤0.60 |
-
≤1.20 |
0.035
0.035 |
0.035
0.035 |
-
≤0.35 |
-
≤0.40 |
-
≤0.15 |
-
Cu≤0.40
V≤0.05 |
|
270-480
270-480W |
-
≤0.25 |
-
≤0.60 |
-
≤1.20 |
0.035
0.035 |
0.035
0.035 |
-
≤0.35 |
-
≤0.40 |
-
≤0.15 |
-
Cu≤0.40
V≤0.05 |
|
340-550
340-550W |
-
≤0.25 |
-
≤0.60 |
-
≤1.50 |
0.035
0.035 |
0.035
0.035 |
-
≤0.35 |
-
≤0.40 |
-
≤0.15 |
-
Cu≤0.40
V≤0.05 |
Other related standard:
ISO 9477
1992 High strength cast steels for general engineering and
structural purposes
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