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alloy steel investment casting using floor tie down used for military vehicle
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alloy steel investment casting using floor tie down used for military vehicle

Retainer, floor tie down is a vehicle part which is designed to be used for medium heavy army vehicle. It is a retainer on floor of vehicle so that the container can be tied down and fixed. So it must be required strictly mechanical properties.
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Retainer, floor tie down is a vehicle part which is designed to be used for medium heavy army vehicle. It is a retainer on floor of vehicle so that the container can be tied down and fixed. So it must be required strictly mechanical properties.


The retainer is produced by alloy steel investment casting, but not forging and other technique, because of its complex construction and strict dimension requirements. The alloy steel investment casting also called lost wax casting which is separate into two kinds of foundry technique. One is sodium silicate/water glass and another is silica sol foundry technique. This part is just adopted by silica sol foundry technique. This process is adopted wax pattern which is covered shell pattern contained silica sol and sand. Silica sol foundry process mainly named the shell pattern contained the silica sol composition. This process makes the casting have fine surface and exact dimension. In generally, the surface roughness can get to 6.4um-12.5um and the dimension accuracy can get CT4-CT6 grade.


Retainer, floor tie down is designed and take the material called high strength low carbon construction alloy steel ZGD345-570. We purchase raw material and melt followed the material test. We can added some metal make the material comply with composition requirements. when Alloy steel investment casting is pouring, the temperature is required strictly according to casting’s construction in order to avoid lost wax casting defect. The test piece was required follow to each furnace batch. The chemical composition as below table.

Element

ZGD345-570

Min.

Max

Carbon

Silicon

Manganese

Phosphorus

Sulfur

Chromium

Cuprum

Aluminum

0.3

0.5

0.6

--

--

0.5

--

--

0.4

0.7

1.2

0.03

0.03

0.8

0.33

0.01

This material is required heat treatment by tempered and hardened condition according to furnace batch number and test piece number and get the requirements of mechanical properties as below table.

property

grade

 

ZGD345-570

Tensile strength, MPa Min

Yield strength, Mpa Min

Elongation, Percent, Min

570

345

14

As refer to special usage of this steel investment casting retainer, floor tie down, it required 100% X-RAY test each order batch. The casting must reach 1 grade level of X-ray test.
alloy steel investment casting Main picture.


alloy steel investment casting Dimension

Keyword:
steel investment casting
lost wax casting
silica sol foundry
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