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Winnington Casting CO.,LTD

[Province: Guangdong ]

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custom alloy steel Investment casting parts with electro polishing / hand polishing

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custom alloy steel Investment casting parts with electro polishing / hand polishing

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PED certificated Investment casting parts with electro polishing and hand polishing,CNC machining capacity in house.

Quick Detail:

Investment casting part of a valve body;
Material: EN 1.4517 (GX2CrNiMoCuN25-6-3-3) stainless steel /alloy steel;
Weight: 1.32kg;
Casting type: silical sol lost wax process;
PED and ISO9001:2008 certificated foundry;
Chemical composition inspected operated before each casting process;
X ray and other NDT service are available.

Description:

Investment Casting parts manufactured by lost wax casting process, for valves in water solution industry, and other pump impeller, valve body, pipe fittings for flow control industry.

Specifications:

Maximum Casting Size	500500350mm
Casting weight	10g~80kg
Wall thickness	1.5-2mm Min
Casting process type	silica sol lost wax casting using medium temperature wax technology
Machining	CNC machining, CNC lathe
Surface finish	Pickled,passivated, zinc plating, black phosphating ,vibration polishing, electro polishing, satin polishing, hand polishing
Tolerances	According to VDG P690
Physical performance	Tensile test, Impact test, Hardness test
Chemical component test	Spectrometer
NDT test	Dye test, X ray test etc

Overview of Lost Wax Method

The model of the part is made of wax from an aluminum die, then the wax patterns are welded onto the runner system which is also made of wax - it forms a pattern tree or called pattern assembly. Next, the pattern tree will be dipped into ceramic slurry of sand or stucco, with drying process between each coating until the shell is thick enough to hold the weight of molten metal which will be poured later.

Then the Pattern tree with wax in it is going to a high pressure oven which melt the wax out. It forms a hollow in the shell. The shell is preheated before pouring to help fluidity of melton metal. A sand bed is always aside to hold the hot poured shell.

In the following process, the shell is broken and removed, so the castings can be seen now. The castings are then cut off from the metal tree and shot blast/polished/machined to get better tolerance and surface.

Alloys that we cast:

Winnington Casting has rich experience pouring a variety of stainless steel, carbon steel, nickel based alloys. The most common alloys we have poured are listed below:

AUSTENITIC STAINLESS STEELS

Specification	Cast Grade	Wrought Equivalent
ASTM A-743, MIL-S-81591	CF16F, IC 303	303
ASTM A-351, A-743, A744	CF20	302
ASTM A-351, A-743, A-744 ASME SA-351	CF3M	316L
ASTM A-351, A-743, A-744 ASME SA-351	CF8	304
ASTM A-351, A-743, A-744 ASME SA-351	CF8M	316