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The Application of Ductile Iron in Pump

Pumps have playing an important role in many areas: agriculture, industry and transportation etc. As a necessary branch of cast iron, ductile iron have such advantages as good heat resistance, a certain degree of corrosion resistance, good mechanical strength at high temperature, good impact resistance, in addition to the characteristics of ordinary cast iron. Iron foundries often combine pump with ductile iron, producing more pump parts of high quality.

1. The Contrast between Similar foreign brands at the table below

Country

U.K

Japan

International standard

USA

HB

Standard

BS2789-85

JISG5502-82

ISO1083-87

ASTM A536-77

 

QT400-18

400/18

FCD37

400-18

60-40-18

130-180

QT450-10

450/10

FCD45

450-10

65-45-12

160-210

QT500-7

500/7

FCD50

500-7

70-50-05

170-230

QT600-3

600/3

FCD60

600-3

80-60-03

190-270

2. Specific application

2.1 ASTM A536 60-40-18 for pump

ASTM A536 60-40-18 is a kind of ferritic ductile iron. The strength, elongation and impact value of this material is higher than malleable iron. It has the capacity of withstand large energy impact loads at room temperature. Its capacity of withstanding of smaller impact resistance many times at room and low temperature are both better than malleable iron. What's more, it also has the anti-corrosion. It can be used to manufacture the wheel of axial flow pump and turbine pump.

2.2 ASTM A536 65-45-12 for pump

ASTM A536 65-45-12 is a kind of ferritic ductile iron. Its characteristic is similar with low-carbon steel which has a high toughness and ductility. It has toughness - brittle transition temperature and high impact value at low temperature. This kind of ductile iron also has the performance of anti-corrosion and heat resistance. It is mainly used to manufacture some parts which require high toughness, plasticity and a certain shock value at low temperature. In the pump field, it is used to manufacture the coupling of Multi-stage centrifugal pumps, inlet flange of pump block, and the wheel of axial vortex pump and joint of Submersible pump etc.

2.3 ASTM A536 70-50-05 for pump

ASTM A536 70-50-05 is a kind of ferrite matrix ductile iron with comprehensive mechanical properties. It can withstand dynamic load and static load. It is used to manufacture the pump, Pump cover, and pump frame and bearing body of centrifugal impurities pump, the skeleton parts of plastic pump and marine electric reciprocating pump rod.

2.4 ASTM A536 80-60-03 for pump

ASTM A536 80-60-03, this material has high strength, hardness wear resistance, a certain degree of plasticity and toughness. Yield ratio is higher than 45 steel. In pump field. It is used to make crankshaft and connecting rods electric reciprocating pump, metering pump rod and disks etc.

In conclusion, different kinds of ductile iron have their own advantages and disadvantages, iron foundry should makes use of the difference to produce more useful products. This is the experience from Dandong Foundry in China for your reference.

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