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CategoriesLost Wax Castings
BrandOBT casting part Manufacturer
MetalsCF8 / AISI 304 Stainless Steel
ManufacturingLost Wax Precision Investment Casting
ApplicationAuto Parts
Heat TreatmentAnnealing, Solution
TestingCMM, Mechanical Properties, Chemical Compositions
Update TimeMarch 28,2023
Detail Information

OEM custom cast stainless steel casting product by precision investment casting + CNC machining. Available further process: heat treatment, surface treatment, testing and assembly. 

Stainless steel is the abbreviation of stainless and acid-resistant steel. It is called stainless steel that is resistant to weak corrosive media such as air, steam, and water. Corrosion resistant steel is called acid-resistant steel.

Investment Casting Technical Data at OBT Foundry
R&D1Software: 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.

Due to the difference in chemical composition between the ordinary stainless steel and acid-resistant steel, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical media corrosion, while acid-resistant steel is generally non-corrosive. The term "stainless steel" not only refers to a single type of stainless steel, but also refers to more than one hundred industrial stainless steels. Each stainless steel developed has good performance in its specific application field.

Stainless steel is often divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenitic-ferritic (duplex) stainless steel and precipitation hardening stainless steel according to the state of microstructure. In addition, according to the chemical compositions, it can be divided into chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel, etc. CF8M stainless steel equals to SS316/F316 and Chinese Standard 0Cr17Ni12Mo2.

In casting production, most of the stainless steel castings are completed by investment casting. The surface of stainless steel castings produced by investment casting is smoother and the dimensional accuracy is easier to control. Of course, the cost of investment casting stainless steel parts is relatively high compared to other processes and materials.

Investment casting, also called precision casting or lost wax casting, is widely used as it offers asymmetrical casting with very fine details to be manufactured relatively inexpensively. The process involves producing a metal casting using a refractory mould made from a wax replica pattern. 

Applications of Our Custom Casting and Machining Parts:
1. Automobile Parts: Brake Disc, Connect Rod, Drive Axle, Drive Shaft, Control Arm, Gearbox Housing, Gearbox Cover, Clutch Cover, Clutch Housing, Wheels, Filter Housing, C.V. Joint Housing, Lock Hook.
2. Truck Parts: Rocker Arms, Transmission Gearbox, Drive Axles, Gear Housing, Gear Cover, Towing Eye, Connect Rod, Engine Block, Engine Cover, Joint Bolt, Power Takeoff, Crankshaft, Camshaft, Oil Pan.
3. Hydraulic Parts: Hydraulic Cylinder, Hydraulic Pump, Gerotor Housing, Vane, Bushing, Hydraulic Tank, Hydraulic Cylinder Head, Hydraulic Cylinder Triangle Bracket.
4. Agricultural Machinery and Tractor Parts: Gear Housing, Gear Cover, Connect Rod, Torque Rod, Engine Block, Engine Cover, Oil Pump Housing, Bracket, Hanger, Hook, Bracket.
5. Rail Trains and Freight Cars: Shock Absorber Housing, Shock Absorber Cover, Draft Gear Housing, Draft Gear Cover, Wedge and Cone, Wheels, Brake Systems, Handles, Guids.
6. Construction Machinery Parts: Gear, Bearing Seat, Gear Pump, Gearbox Housing, Gearbox Cover, Flange, Bushing, Boom Cylinder, Support Bracket, Hydraulic Tank, Bucket Teeth, Bucket.
7. Logistics Equipment Parts: Wheels, Caster, Bracket, Hydraulic Cylinder, Forklift Spare Parts, Lock Case.
8. Valve and Pump Parts: Valve Body (Housing), Butterfly Valve Disc, Ball Valve Housing, Flange, Connector, Camlock, Open Impeller, Close Impeller, Pump Housing (Body), Pump Cover.


Equivalent Grade of Stainless Steel
Martensitic and Ferritic Stainless Steel 420 C1,4034X43Cr16    
440 B/11,4112X90 Cr Mo V18    
-1.2083X42 Cr 13-2314F.5263-
4031.4000X6Cr13403 S 172301F.3110X6Cr13
(410S)1.4001X7 Cr 14(403 S17)2301F.3110X6Cr13
4051.4002X6 CrAl 13405 S 17-F.3111X6 CrAl 13
4161.4005X12 CrS 13416 S 212380F.3411X12CrS13
4101.4006X 10 Cr 13410 S212302F.3401X12Cr13
4301.4016X6 Cr 17430 S 172320F.3113X8Cr17
4201.4021X20 Cr 13420 S 372303F.3402X20Cr13
420F1.4028X30 Cr 13420 S 45(2304)F.3403X30Cr13
(420)1.4031X39Cr13420 S 45(2304)F.3404-
4311.4057X20 CrNi 17 2431 S 292321F.3427X16CrNi16
430F1.4104X12 CrMoS 17-2383F.3117X10CrS17
4341.4113X6 CrMo 17434 S 172325-X8CrMo17
430Ti1.4510X6 CrTi 17---X6CrTi17
4091.4512X5 CrTi 12409 S 17--X6CrTi12
Austenitic Stainless Steel3041.4301X5 CrNi 18 9304 S 152332F.3551X5CrNi18 10
3051.4303X5 CrNi 18 12305 S 19--X8CrNi19 10
3031.4305X12 CrNiS 18 8303 S 212346F.3508X10CrNiS 18 09
304L1.4306X2 CrNiS 18 9304 S 122352F.3503X2CrNi18 11
3011.4310X12 CrNi 17 7-2331F.3517X12CrNi17 07
3041.4350X5 CrNi 18 9304 S 312332F.3551X5CrNi18 10
3041.4350X5 CrNi 18 9304 S 312333F.3551X5CrNi18 10
304LN1.4311X2 CrNiN 18 10304 S 622371--
3161.4401X5 CrNiMo 18 10316 S 162347F.3543X5CrNiMo17 12
316L1.4404-316 S 12/13/14/22/242348 X2CrNiMo17 12
316LN1.4429X2 CrNiMoN 18 13-2375--
316L1.4435X2 CrNiMo 18 12316 S 12/13/14/22/242353-X2CrNiMo17 12
3161.4436-316 S 332343-X8CrNiMo 17 13
317L1.4438X2 CrNiMo 18 16317 S 122367-X2CrNiMo18 16
3291.4460X3 CrNiMoN 27 5 2-2324F.3309-
3211.4541X10 CrNiTi 18 9321 S 122337F.3553X6CrNiTi18 11
3471.4550X10 CrNiNb 18 9347 S 172338F.3552X6CrNiNb18 11
316Ti1.4571X10 CrNiMoTi 18 10320 S 172350F.3535X6CrNiMoTi 17 12
3091.4828X15 CrNiSi 20 12309 S 24--X16 CrNi 24 14
3301.4864X12 NiCrSi 36 16----
Duplex Stainless SteelS327501.4410X 2 CrNiMoN 25 7 4-2328--
S315001.4417X 2 CrNiMoSi 19 5-2376--
S318031.4462X 2 CrNiMoN 22 5 3-2377--
S327601.4501X 3 CrNiMoN 25 7----

Capabilities of Investment Casting Foundry:

• Max Size: 1,000 mm × 800 mm × 500 mm
• Weight Range: 0.5 kg - 100 kg
• Annual Capacity: 2,000 tons
• Bond Materials for Shell Building: Silica Sol, Water Glass and their mixtures.
• Tolerances: On Request.

Advantages of Investment Casting Components:
- Excellent and smooth surface finish
- Tight dimensional tolerances.
- Complex and intricate shapes with design flexibility
- Capability to cast thin walls therefore a lighter casting component
- Wide selection of cast metals and alloys (ferrous and non-ferrous)
- Draft is not required in the molds design.
- Reduce the need for secondary machining.
- Low material waste.


Materials for Investment Casting Process at OBT Foundry
CategoryChina GradeUS GradeGermany Grade
Ferritic Stainless Steel1Cr17, 022Cr12, 10Cr17, 430, 431, 446, CA-15, CA6N, CA6NM1.4000, 1.4005, 1.4008, 1.4016, GX22CrNi17, GX4CrNi13-4
Martensitic Stainless Steel1Cr13, 2Cr13, 3Cr13, 4Cr13, 410, 420, 430, 440B, 440C1.4021, 1.4027, 1.4028, 1.4057, 1.4059, 1.4104, 1.4112, 1.4116, 1.4120, 1.4122, 1.4125
Austenitic stainless steel06Cr19Ni10, 022Cr19Ni10,
06Cr25Ni20, 022Cr17Ni12Mo2, 03Cr18Ni16Mo5
302, 303, 304, 304L, 316, 316L,   329, CF3, CF3M, CF8, CF8M, CN7M, CN3MN1.3960, 1.4301, 1.4305, 1.4306, 1.4308, 1.4313, 1.4321, 1.4401, 1.4403, 1.4404, 1.4405, 1.4406, 1.4408, 1.4409, 1.4435, 1.4436, 1.4539, 1.4550, 1.4552, 1.4581,
1.4582, 1.4584, 
Precipitation Hardening Stainless Steel05Cr15Ni5Cu4Nb, 05Cr17Ni4Cu4Nb630, 634, 17-4PH, 15-5PH,  CB7Cu-11.4542
Duplex Stainless Steel022Cr22Ni5Mo3N, 022Cr25Ni6Mo2NA 890 1C, A 890 1A, A 890 3A, A 890 4A, A 890 5A,
A 995 1B, A 995 4A, A 995 5A, 2205, 2507
1.4460, 1.4462, 1.4468, 1.4469, 1.4517, 1.4770
High Mn SteelZGMn13-1, ZGMn13-3, ZGMn13-5B2, B3, B41.3802, 1.3966, 1.3301, 1.3302
Tool SteelCr12A5, H12, S51.2344, 1.3343, 1.4528, GXCrMo17,   X210Cr13, GX162CrMoV12
Heat Resistant Steel20Cr25Ni20, 16Cr23Ni13,
309, 310, CK20, CH20, HK301.4826, 1.4828, 1.4855, 1.4865
Nickle-base Alloy HASTELLY-C, HASTELLY-X,  SUPPER22H, CW-2M, CW-6M, CW-12MW, CX-2MW, HX(66Ni-17Cr), MRE-2, NA-22H, NW-22,  M30C, M-35-1, INCOLOY600,
2.4815, 2.4879, 2.4680
ZL101, ZL102, ZL104ASTM A356, ASTM A413,  ASTM A360G-AlSi7Mg, G-Al12
Copper AlloyH96, H85, H65, HPb63-3,
HPb59-1, QSn6.5-0.1, QSn7-0.2
C21000, C23000, C27000, C34500, C37710, C86500,  C87600, C87400, C87800,  C52100, C51100CuZn5, CuZn15, CuZn35, CuZn36Pb3, CuZn40Pb2, CuSn10P1, CuSn5ZnPb, CuSn5Zn5Pb5
Cobalt-base Alloy UMC50, 670, Grade 312.4778


stainless steel investment casting products


Up to 0.500±.004"Up to 12.0± 0.10mm
0.500 to 1.000”±.006"12.0 to 25.0± 0.15mm
1.000 to 1.500”±.008"25.0 to 37.0± 0.20mm
1.500 to 2.000”±.010"37.0 to 50.0± 0.25mm
2.000  to 2.500”±.012"50.0 to 62.0± 0.30mm
2.500 to 3.500”±.014"62.0 to 87.0± 0.35mm
3.500 to 5.000”±.017"87.0 to 125.0± 0.40mm
5.000 to 7.500”±.020"125.0 to190.0± 0.50mm
7.500 to 10.000”±.022"190.0 to 250.0± 0.57mm
10.000 to 12.500”±.025"250.0 to 312.0± 0.60mm
12.500 to 15.000±.028"312.0 to 375.0± 0.70mm


Value Added Services on Engineering and Manufacturing: 

Services Description
Surface Treatment ServicesPowder Coating, Anodization, Electrophotesis, Chrome Plating, Painting, Sand blasting, Nickel Plating, Zinc Plating, Blacking, Polishing, Bluing, Geormet, Zintek, etc.
CNC Precision Machining ServicesLathing, Milling, Turning, Honing, Drilling, Boring, Tapping, Wire Electrode Cutting, Grinding...etc.
Inspection and Quality ControlSpectrum Analyzer, CMM, Hardness Tester, Tensile Strength Tester, Yild Strentgh Testor, Sealing Pressure Tester, Carbon Sulfur Analyzer, Metallurgical Microscopy, Press Force Tester...etc.
China stainless steel castings
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