As Chinese professional casting supplier, we provide all grade Grey Iron casitngs per clients’ design.
The matearil cover Chinese iron grade HT100/150/HT200/HT250/HT300, Germany grade GG20/GG25/GG30/GG40, and American grade No 20 to No 60.
Property and Applicaition
Grey Iron Castings
What is Grey Iron?
Grey iron, is also named as Gray Iron. It’s so called because of the color of the fracture face. it’s a metal grade with 1.5-4.3% carbon and 0.3-5% silicon plus manganese, Sulphur and phosphorus. It has low tensile strength but it’s easy to cast. And grey iron is the cheapest metal material too.
Gray iron castings have been produced since the sixth century B.C. During solidification, when the composition and cooling rate are appropriate, carbon will precipitate in the form of graphite flakes that are interconnected within each eutectic cell. The cooling rate of the iron casting while it solidifies plays a major role in the size and shape of the graphite flakes.
What is the grey iron casting made from?
Generally grey iron castings will be made from pig iron, but mostly it will be made from steel or iron scraps now because pig iron is little expensive. The additional alloy should be added when adopt steel scraps, especially the Carbon content. Another problem is the harmful alloy such as Chrome and Nickel should be controlled because some alloy steel will have those alloy.
How to produce Grey Iron Castings?
Sand Casting (Green Sand and Resin Sand)
Sand Casting is the most popular process for grey iron castings, green sand casting can produce small iron castings but resin sand casting can produce big size to several hundred tons.
Lost Foam Casting
Lost Foam Casting is suitable for big requirement in small size, such as valve body 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 Casitng is a good process for iron part, it can acheive better apperance and quality. it’s wide used for bulk production of small parts. But its mold is little expensive.
Centrifugal Casting
Centrifugal casting only produces the round shape such as cast iron Soil pipe and fittings, EN877/ISO6594, ASTM A888
Investment Casting
Only some special designed 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 Grey Iron as material?
- Good melting property.
Grey iron can be melt in low temperature around 1500 ℃, and melted grey iron has very good liquid property, it means that grey iron casting can be designed as thin thickness 4.0mm only, but ductile iron will be difficult for 4mm thickness wall.
- Cheap material.
Grey iron is the cheapest material in all metal grade. It’s widely used in many usual application, such as Fence, solid pipe, lathe bed and others.
- Good property.
Grey/Gray Iron tensile strength normally ranges from 20,000 to 60,000 lb/in2 and is a function of chemistry, graphite morphology, and matrix microstructure. And yield strength or elongation is not normally required in Standard.
The most important property is that grey iron is very stable, it’s a good property for lathe bed and press machine body, and it also widely used as guide rail for lathe.
Grey iron also have good corrosion resistance property, it’s suitable for sewer system which don’t have pressure, such as EN877 soil pipe, gully grating.
Common Grey Iron Grades
| Country | Grey Iron Grade | ||||||
| China | — | HT350 | HT300 | HT250 | HT200 | HT150 | HT100 |
| Japanese | — | FC350 | FC300 | FC250 | FC200 | FC150 | FC100 |
| USA | NO.60 | NO.50 | NO.45 | NO.35/ NO.40 | NO.30 | NO.25 | NO.20 |
| Russia | CЧ40 | CЧ35 | CЧ30 | CЧ24/CЧ25 | CЧ18/CЧ20/CЧ21 | CЧ15 | CЧ10 |
| Germany | GG40 | GG35 | GG30 | GG25 | GG20 | GG15 | GG10 |
| Italy | — | G35 | G30 | G25 | G20 | G15 | G10 |
| France | FGL400 | FGL350 | FGL300 | FGL250 | FGL200 | FGL150 | — |
| England | 400 | 350 | 300 | 260 | 180/220 | 150 | 100 |
| Poland | Z140 | Z135 | Z130 | Z125 | Z120 | Z115 | — |
| India | FG400 | FG350 | FG300 | FG260 | FG200 | FG150 | — |
| Romania | FC400 | FC350 | FC300 | FC250 | FC200 | FC150 | — |
| Spanish | — | FG35 | FG30 | FG25 | FG20 | FG15 | — |
| Belgium | FGG40 | FGG35 | FGG30 | FGG25 | FGG20 | FGG15 | FGG10 |
| Australia | T400 | T350 | T300 | T260 | T220 | T150 | — |
| Sweden | O140 | O135 | O130 | O125 | O120 | O115 | O110 |
| Hungary | OV40 | OV35 | OV30 | OV25 | OV20 | OV15 | — |
| Bulgaria | — | Vch35 | Vch30 | Vch25 | Vch20 | Vch15 | — |
| ISO | — | 350 | 300 | 250 | 200 | 150 | 100 |
| COPANT | FG400 | FG350 | FG300 | FG250 | FG200 | FG150 | FG100 |
| Taiwan(China) | — | — | FC300 | FC250 | FC200 | FC150 | FC100 |
| Holland | — | GG35 | GG30 | GG25 | GG20 | GG15 | — |
| Luxemburg | FGG40 | FGG35 | FGG30 | FGG25 | FGG20 | FGG15 | — |
| Austria | — | GG35 | GG30 | GG25 | GG20 | GG15 | — |
| Europa-Norm | EN-GJL-350 | EN-GJL-300 | EN-GJL-250 | EN-GJL-200 | EN-GJL-150 | ||
The Application for Grey Iron Casting
- Soil pipe and fittings, EN877/ISO6594, ASTM A888
- Lathe bed, press machine body
- Fence fittings
- Counterweight for elevator and forklift
- Pump casing and impellers
- Valve body/disc, butterfly valve, gate valve, strainer and etc.
- Automobile industry,
- Gearbox casing/body
- Gully grating
- Others industry doesn’t need elongation and yield strength.
How to Purchase Grey 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.
Cast Iron Automobile Part
Method: Sand Casting Material: Gray Iron, Ductile Iron A drum brake is a brake in which the friction is caused by a set of shoes or pads that press against the inner surface of a rotating drum. The drum is connected to a rotating wheel. Brake drum castings are made up of S.G. cast iron […]
High Silicon Cast Iron Anode
Method: Resin Sand Casting Material: High Silicon Cast Iron This is a kind of product of cathode protection. Its theory is that connects the current of negative metal material or alloy with the protected metal body, with the exhausting and dissolving of negative metal material or alloy, protective current is transfused to protected metal body, this […]
Decelerator Body Casting
Method: Sand Casting Material: Carbon Steel Casting, Ductile Iron Casting, Gray Iron Casting Surface Finish: Oiled, blasting, Anti-rust Weight: Max to 150kgs Pls inquiry us with your detailed drawings , we will supply you a good price.If the products need to be machinined, we also have CNC and NC Lathe equipment to finish it.
gully grating
Method: Sand Casting, Green Sand Casting or Resin Sand Casitng Material: Cast Ductile Iron, Cast Gray Iron. Standards: En124 General Road gullies, which require a hinged grating on top are designed to collect surface water from roads, parks, etc. Because of the high outlet position, the gully collects any silt or debris as the water […]
Round Manhole Cover
Method: Sand Casting, Green Sand Casting , lost foam casting or Resin Sand Casitng Material: Cast Ductile Iron, Cast Gray Iron. Standards: En124 LOAD CLASSES En 124 A15KN test load Areas which can be used by pedestruabs and pedal cylists En 124 B125KN test load For use in footways, car parks and parking decks. En […]
Manhole Cover
Mothed: Sand Casting, Green Sand Casting or Resin Sand Casitng Material: Cast Ductile Iron, Cast Gray Iron. Standards: En124 LOAD CLASSES En 124 A15KN test load Areas which can be used by pedestruabs and pedal cylists En 124 B125KN test load For use in footways, car parks and parking decks. En 124 C250KN test load […]