As Chinese professional casting supplier, we provide all familar Ductile Iron casitngs per clients’ design and drawings.
Ductile iron was invented in 1948 and patented by the International Nickel company.
Property and Applicaition
Ductile Iron Castings
What is Ductile Iron?
Ductile iron, also named as spheroidal graphite (SG) iron or nodular iron, because the graphite is in the form of small spheres or nodules. By adding magnesium to the molten metal under controlled condition, the graphite structure becomes spherical or nodular. Ductile iron is preferred since it’s also describes one of its characteristics, it show significant improvement of mechanical properties compared with gray iron.
What is the ductile iron casting made from?
Generally ductile iron castings will be made from pig iron, but to save the cost some pearlitic-ferritic ductile iron will be made from steel or iron scraps.
How to produce Ductile Iron Castings?
Sand Casting (Green Sand and Resin Sand)
Sand Casting is the most popular process for ductile iron castings. Green sand casting only can produce small ductile iron castings because the green sand will be not strong in big size. But resin sand casting can produce big size to several hundred tons.
Lost Foam Casting
Lost Foam Casting mainly produce ductile iron pipe and fittings, and now it also produces valve bodies and automobile parts. And sometime foam pattern will be used for resin sand casting for small order but big parts, it will save the wooden pattern cost.
Shell Casting
Shell casting is a good choice for big requirement with small size, it can acheive better apperance and quality. it’s wide used for bulk production of small parts. But its mold is little expensive.
And shell casting also used to produce the core for sand casting.
Centrifugal Casting
Centrifugal casting only produces ductile iron pipe now, such as EN545/ISO2531/ISO9347.
Investment Casting
Only some special designed ductile iron castings will be made by investment casting because investment casting is really terrible expensive. Investment Casting can acheive the best dimension tolerance, it can save the machining cost.
From parts to CAD
Why choose Ductile Iron as engineering material?
The ductile iron “bridged the gap” between grey iron and steel, it can offer the processing advantages of gray iron and combine the many of engineering advantages of steel.
Ductile iron VS Grey Iron
Ductile iron has similar processing advantages as gray iron: low melting point, good fluidity and castablility. But ductile iron has better mechanical property than gray iron, it has yield strength and elongation but grey iron doesn’t have it.
Ductile Iron VS Steel
The ductile iron has similar mechanical property as steel, – high strength, ductility and wear resistance. for example, ductile iron GG40 compared with carbon steel BS3100 A1, their property is similar, but ductile iron is cheaper much than steel. High grade pearlitic ductile iron can achieve very high tensile strength max to 900MPa.
| Metal Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) | Chaprgy |
| DIN 1693 GGG40 | 400 | 250 | 15 | – |
| BS3100 A1 | 430 | 200 | 22 | 27 J |
Ductile iron EN-GJS-400-18LT has good property in low temperature, it’s impact resistance value is 12J at -20℃, this ductile iron is widely used in wind powder industry.
Ductile iron has low melting point, good fluidity and castablility characters.
From parts to CAD
Ductile Iron Standards
ASTM A536: Standard Specification for Ductile Iron Castings
ASTM A897/897M: Standard Specification for Austempered Ductile Iron Castings
ASTM A439: Standard Specification for Austenitic Ductile Iron Castings
DIN 1693 part 1: Cast Iron with Nodular Graphite Unalloyed and Low Alloy Grades.
DIN 1693 Part 2: Cast Iron with Nodular Graphite Unalloyed and Low Alloy Grades Properties in Cast on Test Piece
BS EN 1563: Founding. Spheroidal graphite cast irons
SAE J434: Automotive Ductile (Nodular) Iron Castings
GB/T 1348: Spheroidal graphite iron castings
JIS G 5502: Spheroidal graphite iron castings
As 1831: Ductile Cast Iron
Ductile Iron Mechanical Property
Popular ductiel iron as below:
| Casting Grade | Tensile Strength, min | Yield Strength, min | Elongation in 2in or 50mm, %, min | Uses | ||
| psi, | MPa | psi | MPa | |||
| A536 Gr 60-40-18 | 60 000 | 414 | 40 000 | 276 | 18 | For maximum shock resistant parts |
| A536 Gr 65-45-12 | 65 000 | 448 | 45 000 | 310 | 12 | Most widely used grade for normal service |
| A536 Gr 80-55-06 | 80 000 | 552 | 55 000 | 379 | 6.0 | Suitable for flame and induction hardening |
| A536 Gr 100-70-03 | 100 000 | 689 | 70 000 | 483 | 3.0 | Best combination of strength, ware resistance and surface hardening |
| A536 Gr 120-90-02 | 120 000 | 827 | 90 000 | 621 | 2.0 | Max strength and wear resistance |
| Casting Grade | Tensile Strength, min | Yield Strength, min | Elongation in 2in or 50mm, %, min | ||
| psi, | Mpa | psi | Mpa | ||
| A536 Gr 60-42-10 | 60 000 | 415 | 42 000 | 290 | 10 |
| A536 Gr 70-50-05 | 70 000 | 485 | 50 000 | 345 | 5 |
| A536 Gr 80-60-03 | 80 000 | 555 | 60 000 | 415 | 3 |
| Grade | Guaranteed Properties from separately parts | Reference data | |||
| Symbol | Material Number | Tensile Strength, N/mm2, min | 0,2% proof Strength, N/mm2, min | Elongation %, min | Structure |
| GGG-40 | 0.7040 | 400 | 250 | 15 | Predominantly Ferritic |
| GGG-50 | 0.7050 | 500 | 320 | 7 | Ferritic/Pearlitic |
| GGG-60 | 0.7060 | 600 | 380 | 3 | Pearlitic/Ferritic |
| GGG-70 | 0.7070 | 700 | 440 | 2 | Predominantly pearlitic |
| GGG-80 | 0.7080 | 800 | 500 | 2 | Pearlitic |
Ductile Iron Grade Comparison
| Index | Country | Ductile Iron Grade | |||||||
| 1 | China | QT400-15 | QT400-18 | QT450-10 | QT500-7 | QT600-3 | QT700-2 | QT800-2 | QT900-2 |
| 2 | Japanese | FCD400 | — | FCD450 | FCD500 | FCD600 | FCD700 | FCD800 | — |
| 3 | USA | 60-42-10 | 60-40-18 | 65-45-12 | 70-50-05 | 80-60-03 | 100-70-03 | – | 120-90-02 |
| 4 | Russia | BЧ40 | — | BЧ45 | BЧ50 | BЧ60 | BЧ70 | BЧ80 | BЧ100 |
| 5 | Germany | GGG40 | — | — | GGG50 | GGG60 | GGG70 | GGG80 | — |
| 6 | Italy | GS370-17 | GS400-12 | GS500-7 | GS600-2 | GS700-2 | GS800-2 | — | |
| 7 | France | FGS400-15 | FGS400-18 | FGS450-10 | FGS500-7 | FGS600-3 | FGS700-2 | FGS800-2 | FGS900-2 |
| 8 | England | 400/18 | 450/10 | 500/7 | 600/3 | 700/2 | 800/2 | 900/2 | |
| 9 | Poland | ZS3817 | ZS4012 | ZS4505/5002 | ZS6002 | ZS7002 | ZS8002 | ZS9002 | |
| 10 | India | SG370/17 | SG400/12 | SG500/7 | SG600/3 | SG700/2 | SG800/2 | — | |
| 11 | Romania | — | — | — | — | FGN70-3 | — | — | |
| 12 | Spanish | FGE38-17 | FGE42-12 | FGE50-7 | FGE60-2 | FGE70-2 | FGE80-2 | — | |
| 13 | Belgium | FNG38-17 | FNG42-12 | FNG50-7 | FNG60-2 | FNG70-2 | FNG80-2 | — | |
| 14 | Australia | 300-17 | 400-12 | 500-7 | 600-3 | 700-2 | 800-2 | — | |
| 15 | Sweden | 0717-02 | — | 0727-02 | 0732-03 | 0737-01 | 0864-03 | — | |
| 16 | Hungary | GǒV38 | GǒV40 | GǒV50 | GǒV60 | GǒV70 | — | — | |
| 17 | Bulgaria | 400-12 | 380-17 | 450-5 | 500-2 | 600-2 | 700-2 | 800-2 | 900-2 |
| 18 | ISO | 400-15 | 400-18 | 450-10 | 500-7 | 600-3 | 700-2 | 800-2 | 900-2 |
| 19 | COPANT | — | FMNP45007 | FMNP55005 | FMNP65003 | FMNP70002 | — | — | |
| 20 | Finland | GRP400 | — | GRP500 | GRP600 | GRP700 | GRP800 | — | |
| 21 | Holland | GN38 | GN42 | GN50 | GN60 | GN70 | — | — | |
| 22 | Luxemburg | FNG38-17 | FNG42-12 | FNG50-7 | FNG60-2 | FNG70-2 | FNG80-2 | — | |
| 23 | Austria | SG38 | SG42 | SG50 | SG60 | SG70 | — | — | |
| 24 | Europa-Norm | 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 |
The Application for Ductile Iron Casting
- Ductile iron pipe and fittings for water industry
- Machinery parts. Automobile industry, Gear, Turbine industry
- Building industry
- Pump casing
- Valve body/disc, butterfly valve, gate valve, strainer and etc.
- Manhole cover
How to Purchase Ductile Iron Casting?
Drawing is necesary, such as 3D drawing and CAD drawing.
3D drawings can be IGS/STEP. CAD can be AutoCAD/PDF documents.
If no drawings or design, send us the phicical sample, our 3D Scanner can get 3D drawings from sample.
Valve Parts Casting
Keyword: Sand Casting, Investment Casting, Valve Casting, Steel Casting, Metal Casting As professional Supplier of casting products in China, We are specialized in producing valve parts products, such as valve body, valve disc, valve bonnet , valve hand-wheel, valve flange and valve seat. Generally, the valve products include gate valve , check valve, butterfly valve, […]