ASTM A395 Ductile Iron

ASTM A395 Ductile Iron

ASTM A395 Ductile Iron Castings Custom CNC Machining Parts Product Description and Process ASTM A395 Ductile Iron Castings Custom CNC Machining Parts Production process includes: green sand casting process pre-coated sand casting process resin sand casting process Weight range: from 50 gram to...

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ASTM A395 Ductile Iron Castings Custom CNC Machining Parts

Product Description and Process

ASTM A395 Ductile Iron Castings Custom CNC Machining Parts


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.


How Ductile Iron is Made?

Most of the magic in making ductile iron happens in the furnace with the 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, it 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 the iron can absorb.

Silicon, Sulphur, manganese, and oxygen all do their part in the mix to help the carbon to 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).


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.


Ductile Iron Grade Chart

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℃).


GB/T 1348 1998 (China)

Grade

Tensile strength

σb≥/MPa

Yield strength

σ0.2≥/MPa

Elongation

δ5≥(%)

Hardness

HBS

QT400-18

QT400-18-LT*

400 

250 

18 

130~180 

QT400-15 

400 

250 

15 

130~180 

QT450-10 

450 

310 

10 

160~210 

QT500-7 

500 

320 

170~230 

QT600-3 

600 

370 

190~270 

QT700-2 

700 

420 

225~305 

QT800-2 

800 

480 

245~335 

QT900-2 

900 

600 

280~360

*Low temperature V notch impact tested (-20±2℃).


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