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CategoriesLost Wax Castings
BrandOBT casting part Manufacturer
Cast SteelGray Cast Iron
Casting ProcessLost Wax Investment Casting
Surface TreatmentShot Blasting + Machining + Painting
Heat TreatmentAnnealing + Tempering + Quenching
Update TimeMarch 28,2023
Detail Information

Cast iron, mainly including the gray cast iron and ductile (nodular) cast iron are mainly used for casting by processes of sand casting, shell moulding casting, coated sand casting or lost foam casting. However, for some special situation, the lost wax investment casting process is also used due to their fine surface and higher accuracy. At OBT, we also have tha ability of casting gray iron and ductile with precision lost wax investment casting using silica sol and water glass for shell building.    When cast iron is slowly cooled, the cementite decomposes into iron and carbon in the form of graphite which is called graphitization. Cast irons where a large percentage of cementite is decomposed by graphitization are called grey cast irons. Cas t iron in which graphitization has not taken place, i. e, all the carbon is in the combined form, is called white cast iron. The graphitization process requires time and therefore, when liquid cast iron is cooled rapidly, white cast iron would result. White cast iron is comparable in properties to that of high carbon steels. However, it is highly brittle and as such is not used for structural parts. It is useful for parts where abrasive wear is present. Tensile strength varies between 170 to 345 MPa and is usually about 240 MPa. The hardness ranges from 350 to 500 BHN. In view of the very high hardness, the machinability is poor and is commonly finished by grinding.

Gray Iron ComparisonCasting Thickness/mmChemical Composition(%)
China(GB/T 9439-1988)ISO 185:1988USA ASTM A48/A48M-03(2008)Europe(EN 1561:1997)CSiMnP        ≦S        ≦
HT100 (HT10-26)100No.20 F11401GJL-100 JL-1010-3.4-3.92.1-2.60.5-
HT150 (HT15-33)150No.25A F11701GJL-150 JL-1020<30     30-50     >503.3-3.5 3.2-3.5 3.2-3.52.0-2.4 1.9-2.3 1.8-2.20.5-0.8 0.5-0.8 0.6-
HT200 (HT20-40)200No.30A F12101GJL-200 JL-1030<30     30-50     >513.2-3.5 3.1-3.4 3.0-3.31.6-2.0 1.5-1.8 1.4-1.60.7-0.9 0.8-1.0 0.8-
HT250 (HT25-47)250No.35A F12401 No.40A F12801GJL-250 JL-1040<30     30-50     >523.0-3.3 2.9-3.2 2.8-3.11.4-1.7 1.3-1.6 1.2-1.50.8-1.0 0.9-1.1 1.0-
HT300   (HT30-54)300No.45A F13301GJL-300 JL-1050<30     30-50     >532.9-3.2 2.9-3.2 2.8-3.11.4-1.7 1.2-1.5 1.1-1.40.8-1.0 0.9-1.1 1.0-
HT350   (HT35-61)350No.50A F13501GJL-350 JL-1060<30     30-50     >542.8-3.1 2.8-3.1 2.7-3.01.3-1.6 1.2-1.5 1.1-1.41.0-1.3 1.0-1.3 1.1-

Investment casting (or lost wax casting) refers to the formation of ceramic around the wax patterns to create a multi or single part mold to receive molten metal. This process utilizes an expendable injection molded wax pattern process to achieve complex forms with exceptional surface qualities. Precision investment castings can achieve exceptional accuracy for both small and large casting parts in a wide range of materials.

To create a mold, a wax pattern, or cluster of patterns, is dipped into ceramic material several times to build a thick shell. De-wax process is then followed by the shell dry process. The wax-less ceramic shell is then produced. Molten metal is then poured into the ceramic shell cavities or cluster, and once solid and cooled, the ceramic shell is broken off to reveal the final cast metal object.

Investment Casting Technical Data at OBT
R&DSoftware: Solidworks, CAD, Procast, Pro-e
Lead Time for Development and Samples: 25 to 35 days
Molten MetalFerritic 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
Material for Shell BuildingSilica Sol (Precipitated Silica )
Water Glass (Sodium Silicate)
Mixtures of Silica Sol and Water Glass
Technical ParameterPiece 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: VDG P690, D1/CT5-7
Tolerance of Machining: ISO 2768-mk/IT6
Inner Core: Ceramic Core, Urea Core, Water Soluble Wax Core
Heat TreatmentNormalizing, Tempering, Quenching, Annealing, Solution, Carburization.
Surface TreatmentPolishing, Sand / Shot Blasting, Zinc Plating, Nickel Plating, Oxidation Treatment, Phosphating, Powder Painting, Geormet, Anodizing
Dimension TestingCMM, Vernier Caliper, Inside Caliper. Depth Gage, Height Gage, Go/No go Gage, Special Fixtures
Chemical InspectionChemical Compostion Analysis (20 chemical elements), Cleanliness Inspection, X-ray Radiographic Inspection, Carbon-Sulfur Analyser
Physical InspectionDynamic Balancing, Static Blancing, Mechanical Properties (Hardness, Yield Strength, Tensile Strength), Elongation
Production CapacityMore than 250 tons per month, more than 3,000 tons annually.
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