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