<strong>What’s the difference between Ductile Iron and Cast Iron? </strong>

Iten Cast iron Ductile ironDurability Cast iron is a strong material that can handle higher pressures. Ductile iron also has impressive structural integrity. It can handle high pressures and temperatures without flinching. Price Lower more expensive Cast iron is brittle and it breaks when bent.Ductile iron can be bent without breaking. Cast iron is not flexibleDuctile iron is flexible,ApplicationsCast iron is mainly seen in the construction industry.Ductile iron is mainly used in the automobile industry such as trucks, tractors and oil pumps.difference between Ductile Iron and Cast Iron Table

<strong>What’s the difference between Ductile Iron and Grey Iron? </strong>

Itemductile iron Grey iron Physical property higher tensile strength and yield strength, elongation rate. more durable, reliable and tough.has good abrasive resistance and cast ability. lower tensile strength and elongation. Production process more complex and difficultSimple process Microstructure has many graphite ballshas many graphite flakes Application Casting parts for machinery, tractors, trucks, automotiveStove parts, boiler parts, machinery bases lower pricesCasting ProdcutsDuctile iron castings are the products. Ductile iron is just a material.Grey iron castings are the products. Grey iron is just a material.

What Is Ductile Iron | Grade

What is Ductile Iron?

Ductile iron is also known as spheroidal graphite iron, ductile cast iron. The inner structure occurs as spheroids, so it is sometimes referred to as spheroidal graphite. It is a durable, fatigue-resistant metal. The ductile iron was invented in 1943, First patented in 1948. Ductile iron and cast iron have contrasting physical properties caused by differences in their microstructures. The carbon contained in ductile iron is held in the form of nodules. This unique microstructure causes ductile iron to withstand bending and shock loading better than cast iron.

What is Ductile Iron made from?

Ductile iron is mainly made from pig iron.

Pig iron refers to the crude iron that’s produced by smelting ore in a blast furnace. It is about 90% iron with high carbon content. Its chemical properties are very stable. Using a blast furnace, the pig iron is melted down and has carbon forced into the material beyond its normal capacity. Silicon, sulfur, and manganese help the excess carbon from the spherical graphite nodules as the metal cools in its cast. This process creates a durable, wear-resistant metal.

Ductile Iron Advantages

The ductile iron provides advantages for designers:

Easily to be cast and machine.
Excellent strength to weight ratio.
Lower cost than steel.
Great castability and machinability.

Ductile iron provides a designer with an exceptional combination of toughness, low-cost manufacturing and reliability.

Ductile Iron Properties

There are several matrices found within ductile iron. The most common graphite microstructure is below. The unique microstructure of each metal can cause its physical properties

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 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. The most common matrix for commercial grades of ductile iron.

World Ductile Iron Grades List

1	China	QT400-18	QT450-10	QT500-7	QT600-3	QT700-2	QT800-2	QT900-2
2	Japan	FCD400	FCD450	FCD500	FCD600	FCD700	FCD800	—
3	USA	60-40-18	65-45-12	70-50-05	80-60-03	100-70-03	120-90-02	—
4	Russia	B Ч 40	B Ч 45	B Ч 50	B Ч 60	B Ч 70	B Ч 80	B Ч 100
5	Germany	GGG40	—	GGG50	GGG60	GGG70	GGG80	—
6	Italy	GS370-17	GS400-12	GS500-7	GS600-2	GS700-2	GS800-2	—
7	France	FGS370-17	FGS400-12	FGS500-7	FGS600-2	FGS700-2	FGS800-2	—
8	England	400/17	420/12	500/7	600/7	700/2	800/2	900/2
9	Poland	ZS3817	ZS4012	ZS5002	ZS6002	ZS7002	ZS8002	ZS9002
10	India	SG370/17	SG400/12	SG500/7	SG600/3	SG700/2	SG800/2	—
11	Romania	—	—	—	—	FGN70-3	—	—
12	Spain	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	400-12	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	380-17	400-12	450-5, 500-2	600-2	700-2	800-2	900-2
18	ISO	400-18	450-10	500-7	600-3	700-2	800-2	900-2
19	COPANT	—	FMNP45007	FMNP55005	FMNP65003	FMNP70002	—	—
20	China Taiwan	GRP400	—	GRP500	GRP600	GRP700	GRP800	—
21	Holland	GN38	GN42	GN50	GN60	GN70	—	—
22	Luxembourg	FNG38-17	FNG42-12	FNG50-7	FNG60-2	FNG70-2	FNG80-2	—
23	Austria	SG38	SG42	SG50	SG60	SG70	—	—

What is Ductile Iron Usage?

Because of ductile iron strength and malleability, it is used widely in many different industries. Including

Pipes and pipe fittings.
Automotive industry engine connecting rods, cylinders, crankshafts, truck axles, and gears
Machine Parts, machine frames, and cable drums.

When you are looking for a strong, stable material that can withstand tough conditions over a long period of time, ductile iron will be a great choice

Common Ductile Iron Grades used in JC Casting

While there are many different ductile iron specifications, JC CASTING 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 %

Density lb/in3

0.256

Density g/cm3

7.1

Melting Temperature (Degrees F)

2,100 – 2,190

Melting Temperature (Degrees C)

1,150 – 1,200

Compressive Strength Ksi

429

Compressive Strength MPa

2960

UNS

F32800

F33100

F33800

Custom Ductile Iron Casting Services

JC Casting Foundry is a Ductile Iron Casting manufacturer and supplier in China. Get a quote details on our service to meet your projects. Email us: info@jccasting.comF

FAQ

Iten	Cast iron	Ductile iron
Durability	Cast iron is a strong material that can handle higher pressures.	Ductile iron also has impressive structural integrity. It can handle high pressures and temperatures without flinching.
Price	Lower	more expensive
	Cast iron is brittle and it breaks when bent.	Ductile iron can be bent without breaking.
	Cast iron is not flexible	Ductile iron is flexible,
Applications	Cast iron is mainly seen in the construction industry.	Ductile iron is mainly used in the automobile industry such as trucks, tractors and oil pumps.

difference between Ductile Iron and Cast Iron Table

Item	ductile iron	Grey iron
Physical property	higher tensile strength and yield strength, elongation rate. more durable, reliable and tough.	has good abrasive resistance and cast ability. lower tensile strength and elongation.
Production process	more complex and difficult	Simple process
Microstructure	has many graphite balls	has many graphite flakes
Application	Casting parts for machinery, tractors, trucks, automotive	Stove parts, boiler parts, machinery bases lower prices
Casting Prodcuts	Ductile iron castings are the products. Ductile iron is just a material.	Grey iron castings are the products. Grey iron is just a material.

What is Ductile Iron