Cast Iron Part Ductile Cast Iron GGG40 Material Sand Casting Foundry China
Product Description and Process
Cast Iron Part Ductile Cast Iron GGG40 Material Sand Casting Foundry China
Production process:
greensand casting process
pre-coated sand casting process
resin sand casting process
Weight range: from 50 grams to 2,000 kilograms for ductile iron casting product
Sand mold production:
Automatic molding machine
Z145 molding machine
Z146 molding machine
Z148 molding machine
Handwork molding, though most parts can achieve the molding by machine, for some complex structure parts, the hand molding is still needed.
Machining process:
CNC machine, machining center, lathe, mill machine, drill machine, etc.
Surface treatment process:
paint coating, electrophoretic paint coating, electro galvanizing coating, black oxide coating, phosphate treatment, powder coating, etc.
Product Material and Uses
Normally production with gray iron HT200, HT250, ductile iron 65-45-12, 60-40-18, 80-55-06, 80-60-03, 100-70-03, etc.
The ductile iron casting products are widely used for Auto-cars, trains, trucks, vehicle components, mining machinery components, agricultural machinery parts, textile machinery parts, construction machinery parts, etc.
How Ductile Iron is Made?
Most of the magic in making ductile iron happens in the furnace with molten iron. You start with the iron (of course) and then add more carbon than the iron would normally be able to absorb into the structure. Explaining the iron-carbon relationship in another way is like adding so much salt to your water that you reach a point no more salt will dissolve. By the way, this is what makes ductile iron different than steel. Steel only has as much carbon as iron can absorb.
Silicon, Sulphur, manganese, and oxygen all do their part in the mix to help the carbon form into spherical graphite structures as the iron cools. This, admittedly, is an oversimplification of the process (after all, we are not training you for a metallurgical degree, though if you want one, we like the Engineering Degrees found in Wisconsin, don’t mind our geographic bias).
Properties of Ductile Iron
To create different grades of ductile iron, one must control the matrix structure around the graphite during the casting process or through subsequent heat treatment. The minor compositional differences between the different grades of ductile iron exist in order to create the desired matrix (microstructures).
Ductile iron can be considered as steel with graphite spheroids dispersed throughout its matrix. The qualities of the metallic matrix in which the graphite spheroids are suspended have a significant effect on ductile iron’s properties, but the graphite spheroids themselves do not.
There are several matrices found within ductile iron, the most common being
Ferrite – a pure, ductile, flexible iron with little strength. This matrix has poor wear resistance, but high impact resistance and good machinability.
Pearlite – a mechanical mixture of ferrite and iron carbide (Fe3C). It is relatively hard, with moderate ductility. It has high strength, good wear resistance, moderate impact resistance, and good machinability.
Pearlite/Ferrite – a structure consisting of a mixture of pearlite and ferrite, and the most common matrix for commercial grades of ductile iron.
Common Ductile Iron Grates
While there are many different ductile iron specifications, foundries routinely offer 3 common grades;
Physical and Mechanical Properties |
ASTM A536, Grade 60-40-18 |
ASTM A536, Grade 65-45-12 |
ASTM A536, Grade 80-55-06 |
Tensile Strength, min, psi |
60,000 |
65,000 |
80,000 |
Tensile Strength, min, MPa |
414 |
448 |
552 |
Yield Strength, min, psi |
40,000 |
45,000 |
55,000 |
Yield Strength, min, MPa |
276 |
310 |
379 |
Elongation in 2 in. or 50 mm, min % |
18 |
12 |
6 |
Density lb/in3 |
0.256 |
0.256 |
0.256 |
Density g/cm3 |
7.1 |
7.1 |
7.1 |
Melting Temperature (Degrees F) |
2,100 – 2,190 |
2,100 – 2,190 |
2,100 – 2,190 |
Melting Temperature (Degrees C) |
1,150 - 1,200 |
1,150 - 1,200 |
1,150 - 1,200 |
Compressive Strength Ksi |
429 |
429 |
429 |
Compressive Strength MPa |
2960 |
2960 |
2960 |
UNS |
F32800 |
F33100 |
F33800 |
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