SG Iron is known as Spheroidal Graphite Iron, and also known as Ductile Cast Iron, Nodular Cast Iron, or Spherulitic Graphite Cast Iron.
SG Iron is a type of cast iron that has been treated while molten with an element such as magnesium or cerium to induce the formation of free graphite as nodules or spherulites.
The followings are the grade requirement to the chemical components and physical properties, and also grade comparison chart. At the same time, we listed the main content of material standards using in USA, China, Germany, Europe and International.
Please notice that the chemical components are only a reference, not a strict standard to the material. The foundry could adjust its chemical components according to their experience in order to meet the physical properties. So, physical properties should be the only standard to materials.
Chemical Components of SG Cast Iron
USA |
Germany |
ISO |
C % |
Si % |
Mn % |
P % |
S % |
Mg % |
Cu % |
Sn % |
60-40-18 |
GGG40 |
400-18 |
3.50-3.78 |
2.80-2.85 |
0.2-0.5 |
0.03-0.06 |
0.02-0.035 |
0.020-0.060 |
- |
- |
65-45-12 |
GGG40 |
450-10 |
3.30-3.80 |
2.40-2.90 |
0.2-0.5 |
0.03-0.06 |
0.02-0.040 |
0.020-0.060 |
- |
- |
70-50-05 |
GGG50 |
500-7 |
3.20-3.60 |
2.30-2.90 |
0.4-0.6 |
0.03-0.06 |
0.02-0.040 |
0.030-0.055 |
<0.4 |
- |
80-60-03 |
GGG60 |
600-3 |
3.00-3.50 |
2.40-2.80 |
0.3-0.5 |
0.03-0.06 |
0.02-0.040 |
0.035-0.050 |
0.30-0.40 |
- |
100-70-03 |
GGG70 |
700-2 |
3.65-3.90 |
1.70-1.90 |
0.3-0.5 |
<0.06 |
<0.03 |
0.035-0.050 |
0.30-0.40 |
0.03-0.06 |
120-90-02 |
GGG80 |
800-2 |
- |
- |
- |
- |
- |
- |
- |
- |
Equivalent Grades of SG Iron (Ductile Iron / Nodular Graphite Iron Casting)
Country |
Standard |
Equivalent Grades of Ductile Iron (SG Iron, Nodular Graphite Iron) |
ISO |
ISO 1083 |
400-15
400-18 |
450-10 |
500-7 |
600-3 |
700-2 |
800-2 |
900-2 |
China |
GB 1348 |
QT400-18 |
QT450-10 |
QT500-7 |
QT600-3 |
QT700-2 |
QT800-2 |
QT900-2 |
USA |
ASTM A536 |
60-40-18 |
60-42-10
65-45-12 |
70-50-05 |
80-55-06
80-60-03 |
100-70-03 |
120-90-02 |
— |
Germany
Austria |
DIN 1693 |
GGG40 |
— |
GGG50 |
GGG60 |
GGG70 |
GGG80 |
— |
European |
EN 1563 |
EN-GJS-400-15
EN-GJS-400-18 |
EN-GJS-450-10 |
EN-GJS-500-7 |
EN-GJS-600-3 |
EN-GJS-700-2 |
EN-GJS-800-2 |
EN-GJS-900-2 |
Japan |
JIS G5502 |
FCD400 |
FCD450 |
FCD500 |
FCD600 |
FCD700 |
FCD800 |
— |
Italy |
UNI 4544 |
GS370-17 |
GS400-12 |
GS500-7 |
GS600-2 |
GS700-2 |
GS800-2 |
— |
France |
NF A32-201 |
FGS370-17 |
FGS400-12 |
FGS500-7 |
FGS600-2 |
FGS700-2 |
FGS800-2 |
— |
UK |
BS 2789 |
400/17 |
420/12 |
500/7 |
600/7 |
700/2 |
800/2 |
900/2 |
India |
IS 1865 |
SG370/17 |
SG400/12 |
SG500/7 |
SG600/3 |
SG700/2 |
SG800/2 |
— |
Spain |
UNF |
FGE38-17 |
FGE42-12 |
FGE50-7 |
FGE60-2 |
FGE70-2 |
FGE80-2 |
— |
Belgium |
NBN 830-02 |
FNG38-17 |
FNG42-12 |
FNG50-7 |
FNG60-2 |
FNG70-2 |
FNG80-2 |
— |
Australia |
AS 1831 |
300-17
400-12 |
— |
500-7 |
600-3 |
700-2 |
800-2 |
— |
Sweden |
SS 14 07 |
0717-02 |
— |
0727-02 |
0732-03 |
0737-01 |
0864-03 |
— |
Norway |
NS11 301 |
SJK-400.3
SJK-400 |
— |
SJK-500 |
SJK-600 |
SJK-700 |
SJK-800 |
— |
DUCTILE IRON GRADE CHART
ASTM A536 1993 (USA)
Grade |
Tensile Strength
σ≥/Mpa |
Yield Strength
σ≥/Mpa |
Elongation
δ≥（%） |
ANSI/ASTM |
UNS |
60-40-18 |
F32800 |
414 |
276 |
18 |
65-45-12 |
F33100 |
448 |
310 |
12 |
80-55-06 |
F33800 |
552 |
379 |
6.0 |
100-70-03 |
F34800 |
689 |
483 |
3.0 |
120-90-02 |
F36200 |
827 |
621 |
2.0 |
Special Purpose |
|
|
|
|
60-42-10 |
|
415 |
290 |
10 |
70-50-05 |
485 |
345 |
5.0 |
80-60-03 |
555 |
415 |
3.0 |
GB/T 1348 1998 (China)
Grade |
Tensile strength
σb≥/MPa |
Yield strength
σ0.2≥/MPa |
Elongation
δ5≥(％) |
Hardness
HBS |
QT400-18
QT400-18-LT * |
400 |
250 |
18 |
130~180 |
QT400-15 |
400 |
250 |
15 |
130~180 |
QT450-10 |
450 |
310 |
10 |
160~210 |
QT500-7 |
500 |
320 |
7 |
170~230 |
QT600-3 |
600 |
370 |
3 |
190~270 |
QT700-2 |
700 |
420 |
2 |
225~305 |
QT800-2 |
800 |
480 |
2 |
245~335 |
QT900-2 |
900 |
600 |
2 |
280~360 |
* Low temperature V notch impact tested (-20±2℃)
DIN 1693 1997 (Germany)
Grade |
Material No
W-Nr. |
Tensile strength
σb≥/Mpa |
Yield strength
σ0.2≥/Mpa |
Elongation
δ≥（％） |
GGG-40 |
0.7040 |
400 |
250 |
15 |
GGG-50 |
0.7050 |
500 |
320 |
7 |
GGG-60 |
0.7060 |
600 |
380 |
3 |
GGG-70 |
0.7070 |
700 |
400 |
2 |
GGG-80 |
0.7080 |
800 |
500 |
2 |
EN 1563 1997 (European Standard)
Grade |
Tensile Strength
σ≥/Mpa |
Yield Strength
σ≥/Mpa |
Elongation
δ≥（%） |
Symbol |
Number |
EN GJS 350-22 |
EN JS1010 |
350 |
220 |
22 |
EN GJS 350-22-LT* |
EN JS1015 |
350 |
220 |
22 |
EN GJS 400-18 |
EN JS1020 |
400 |
250 |
18 |
EN GJS 400-18-LT* |
EN JS1025 |
400 |
240 |
18 |
EN GJS 400-15 |
EN JS1030 |
400 |
250 |
15 |
EN GJS 450-10 |
EN JS1040 |
450 |
310 |
10 |
EN GJS 500-7 |
EN JS1050 |
500 |
320 |
7 |
EN GJS 600-3 |
EN JS1060 |
600 |
370 |
3 |
EN GJS 700-2 |
EN JS1070 |
700 |
420 |
2 |
EN GJS 800-2 |
EN JS1080 |
800 |
480 |
2 |
EN GJS 900-2 |
EN JS1090 |
900 |
600 |
2 |
* Low temperature V notch impact tested (-20±2℃)
ISO 1083 1987 (International)
Grade |
Tensile strength
σb≥/Mpa |
Yield strength
σ0.2≥/Mpa |
Elongation
δ≥（%） |
Hardness
HBS |
900-2 |
900 |
600 |
2 |
280~360 |
800-2 |
800 |
480 |
2 |
245-335 |
700-2 |
700 |
420 |
2 |
225~305 |
600-3 |
600 |
370 |
3 |
190~270 |
500-7 |
500 |
320 |
7 |
170~230 |
450-10 |
450 |
320 |
10 |
160~210 |
400-15 |
400 |
250 |
15 |
130~180 |
400-18
400-18 AL* |
400 |
250 |
18 |
130~180 |
350-22 |
350 |
220 |
22 |
≤150 |
* Low temperature V notch impact tested (-20±2℃) |
