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  SG Iron Casting Grades and Standards  
 

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 

170~230 

QT600-3 

600 

370 

190~270 

QT700-2 

700 

420 

225~305 

QT800-2 

800 

480 

245~335 

QT900-2 

900 

600 

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 

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℃)

 

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