QT450-12 Casting

QT450-12 Casting

ASTM A536 Grade 65 45 12 Ductile Iron Products Exporter China Product Description and Process ASTM A536 Grade 65 45 12 Ductile Iron Products Exporter China Production process includes: green sand casting process pre-coated sand casting process resin sand casting process Weight range: from 50...

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ASTM A536 Grade 65 45 12 Ductile Iron Products Exporter China

Product Description and Process

ASTM A536 Grade 65 45 12 Ductile Iron Products Exporter China


Production process includes:

green sand casting process

pre-coated sand casting process

resin sand casting process

Weight range: from 50 gram to 2,000 kilograms for ductile iron casting product


Machining process:

CNC machine, machining center, lathe, mill machine, drill machine, etc.


Surface treatment process:

paint coating, electrophoretic paint coating, electrogalvanizing 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.


What is in Ductile Iron? (Composition)

If you were to do a chemical analysis of ductile iron, this is what you would normally find:

Iron ~94%

Carbon 3.2 – 3.60%

Silicon 2.2 – 2.8%

Manganese 0.1 – 0.2%

Magnesium 0.03 – 0.04%

Phosphorus 0.005 – 0.04%

Sulfur 0.005 – 0.02%

Copper <= 0.40%

To improve the strength of ductile iron, additional tin or copper can be added.  To improve corrosion resistance, copper, nickel, or chromium can replace anywhere from 15-30% of the iron.


What are the Benefits of Ductile Iron?

Ductile iron castings are very strong compared to regular cast iron (gray iron).  The tensile strength of cast iron is 20,000 – 60,000 psi while ductile iron starts at 60,000 psi and can go to 120,000 psi.  The yield strength for ductile iron is generally 40,000 – 90,000 psi but the yield strength of cast iron is so low it is considered not measurable.

Let us put strength in a different way.  We have seen gray iron parts break when they hit the ground after falling ten feet.  With a ductile iron casting, you can hit the part all day long with an eight-pound sledge hammer and it is not likely to crack.

What causes the problem for gray iron is those graphite flakes which encourage fractures along the flakes, while the nodules in ductile iron work at keeping the iron together.  Given the exact same scenario of the same part made from the two different metals, while the brittle gray iron wants to crack, the ductile iron wants to bend.

Ductile iron also has what is called excellent wear resistance because of the graphite in the iron.  When you have something rubbing against ductile iron, the ductile iron wears away much slower than many other metals.  The wear resistance is partly from the graphite structures that can act like a dry lubricant on the iron.

Ductile iron also dissipates (gets rid of) heat very well and can be machined fairly easily, though ductile iron is harder to work with than regular gray cast iron.  Ductile cast iron dampens vibration and sound much better than steel would making ductile iron a good match for use on large machines.


Common Ductile Iron Grades

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/in 3

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


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


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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