Stainless steel investment castings from China foundry

Stainless steel has a minimum chromium content of 10.5%, making it more resistant to corrosive liquid environments and to oxidation. It is highly corrosion resistant and wear resistant, provides excellent machinability, and is well-known for its aesthetic appearance. Stainless steel investment castings are "corrosion-resistant" when used in liquid environments and vapors below 1200°F (650°C) and "heat-resistant" when used above this temperature. The base alloy elements of any nickel-base or stainless steel investment casting are chromium, nickel, and molybdenum (or "moly"). These three components will determine the casting's grain structure and mechanical properties and will be instrumental in the casting's ability to combat heat, wear, and corrosion.

Commonly, the stainless steel should be cast by the investment precision casting process with the silica sol as the bond. The stainless steel silica sol castings have a very high grade of precision surface and performance.

Due to its unique physical properties, stainless steel castings are popular in a wide range of applications, especially those in harsh environments. Common markets for stainless steel investment castings include oil and gas, fluid power, transportation, hydraulic systems, food industry, hardware and locks, agriculture...etc.

Investment Casting Material at RMC Foundry
Martensitic Stainless Steel	100 Series: ZG1Cr13, ZG2Cr13 and more
Ferritic stainless steel	200 Series: ZG1Cr17, ZG1Cr19Mo2 and more
Austenitic stainless steel	300 Series: 304, 304L, CF3, CF3M, CF8M, CF8, 1.4304, 1.4401...etc.
Duplex Stainless Steel	400 Series: 1.4460, 1.4462, 1.4468, 1.4469, 1.4517, 1.4770; 2205, 2507
Precipitation Hardening Stainless Steel	500 Series: 17-4PH, 15-5PH, CB7Cu-1; 1.4502
Carbon Steel	C20, C25, C30, C45; A216 WCA, A216 WCB,
Low Alloy Steel	IC 4140, IC 8620, 16MnCr5, 42CrMo4
Grey Cast Iron; Ductile Cast Iron	GG15 ~ GG35; EN-GJL-150 ~ EN-GJL-250; GGG40 ~ GGG80; EN-GJS-400 ~ EN-GJS-800
Super Alloy and Special Alloys	Heat Resistant Steel, Wear Resistant Steel, Tool Steel,
Aluminum Alloy	A355, A356, A360, A413
Copper Alloy	Brass, Bronze. C21000, C23000, C27000, C34500, C37710, C86500, C87600, C87400, C87800, C52100, C51100
RMC can meet material specification acc. to ASTM, SAE, AISI, ACI, DIN, EN, ISO, GB standards.

The investment casting is also called precision casting because it have much better surface and higher accuracy than any other casting process. Especially for the silica sol casting process, the finished castings could reach the CT3 ~ CT5 in geometrical casting tolerance and CT4 ~ CT6 in dimensional casting tolerance. For the casings produced by investment, there will be less or even no need to make the machining processes. To some extent, the investment casting could replace the rough machining process.

Investment Casting Technical Data at RMC Foundry
R & D	Software: Solidworks, CAD, Procast, Pro-e
R & D	Lead Time for Development and Samples: 25 to 35 days
Molten Metal	Ferritic Stainless Steel, Martensitic Stainless Steel, Austenitic stainless steel, Precipitation Hardening Stainless Steel, Duplex Stainless Steel
	Carbon Steel, Alloy Steel, Tool Steel, Heat Resistant Steel,
	Nickle-base Alloy, Aluminium Alloy, Copper-base Alloy, Cobalt-base Alloy
Metal Standard	ISO, GB, ASTM, SAE, GOST EN, DIN, JIS, BS
Material for Shell Building	Silica Sol (Precipitated Silica )
	Water Glass (Sodium Silicate)
	Mixtures of Silica Sol and Water Glass
Technical Parameter	Piece Weight: 2 gram to 200 kilo gram
	Max Dimension: 1,000 mm for Diameter or Length
	Min Wall Thickness: 1.5mm
	Casting Roughness: Ra 3.2-6.4, Machining Roughness: Ra 1.6
	Tolerance of Casting: ISO8062; VDG P690, D1/CT5-7
	Tolerance of Machining: ISO 2768-mk/IT6
	Inner Core: Ceramic Core, Urea Core, Water Soluble Wax Core
Heat Treatment	Normalizing, Tempering, Quenching, Annealing, Solid Solution, Carburization.
Surface Treatment	Polishing, Sand / Shot Blasting, Zinc Plating, Nickel Plating, Oxidation Treatment, Phosphating, Powder Painting, Geormet, Anodizing
Dimension Testing	CMM, Vernier Caliper, Inside Caliper. Depth Gauge, Height Gauge, Go/No go Gauge, Special Fixtures
Chemical Inspection	Chemical Compostion Analysis (20 chemical elements), Cleanliness Inspection, X-ray Radiographic Inspection, Carbon-Sulfur Analyser. 3.1 Material Certificate is Available
Physical Inspection	Dynamic Balancing, Static Blancing, Mechanical Properties (Hardness, Yield Strength, Tensile Strength), Elongation
Production Capacity	More than 250 tons per month, more than 3,000 tons annually.