precision CNC machined investment casting stainless steel part
We specialize in the production of cnc machined investment casting part solutions engineered to the most demanding dimensional and surface finish requirements. As a dedicated manufacturer of cnc machining stainless steel part components, we deliver fully finished investment castings produced from 304, 316, 17-4 PH, duplex stainless steel and other high-performance alloys. Every cnc machined precision investment casting stainless steel part from China is manufactured according to customer drawings, samples and technical specifications, with full traceability and consistent quality across prototype, low-volume and high-volume production runs.
Our integrated production flow combines silica sol investment casting, precision CNC machining, surface treatment and final inspection under one roof. This vertical integration allows us to control every step of the manufacturing process, reduce lead times, optimize material properties and deliver cost-effective solutions for industries including fluid control, medical equipment, food processing, marine hardware, automotive, aerospace, pump and valve, and general industrial machinery.
Our Core Capabilities
Investment Casting Process
We produce cnc machined investment casting part components using the silica sol investment casting process, which delivers exceptional surface smoothness, tight dimensional tolerances and excellent replication of complex geometries. The process is suitable for thin-wall structures, intricate internal passages and near-net-shape parts that minimize subsequent machining operations. Wax patterns are produced from aluminum or 3D-printed dies, assembled into trees, coated with multiple ceramic layers, dewaxed, sintered and poured under controlled temperature and atmosphere conditions.
Precision CNC Machining
Every cnc machining stainless steel part is processed on 3-axis, 4-axis and 5-axis CNC machining centers with live tooling capabilities. We perform milling, turning, drilling, tapping, boring, reaming, threading and contour machining to achieve tight tolerances down to IT6–IT7 grade, surface roughness as low as Ra 0.8 μm and precise positioning accuracy. Our machining department is equipped with vertical machining centers, horizontal lathes, Swiss-type turning centers and secondary finishing equipment to handle parts from a few grams up to 50 kg in weight.
Custom Design & Engineering
We support customers from the earliest design stages through full production. Our engineering team reviews drawings for castability, suggests design modifications to reduce cost and improve quality, and provides DFM (Design for Manufacturing) recommendations. We work directly from your 2D drawings, 3D CAD models (STEP, IGES, SolidWorks), physical samples or reverse-engineered reference parts. Prototypes can be delivered in short lead times using rapid tooling and 3D printed wax patterns, allowing functional testing before committing to production tooling.
Material Selection
Our cnc machined precision investment casting stainless steel part from China is available in a wide range of stainless steel and alloy materials. Standard grades include AISI 304, 304L, 316, 316L, 321, 410, 420, 430, 17-4 PH, 2205 duplex stainless steel, CF8, CF8M, CF3 and CF3M. We also cast heat-resistant alloys, corrosion-resistant alloys, carbon steels, low alloy steels and nickel-based alloys according to customer specifications. All materials are supplied with mill test reports and verified by spectrometer analysis.
Production Volume Flexibility
We manufacture according to your requirements from single prototype pieces and small batch runs all the way to large-scale mass production. Whether you need one-off custom components, spare parts, pilot production or annual volume releases of tens of thousands of pieces, we scale our production accordingly. Our flexible production planning system ensures consistent quality, on-time delivery and competitive pricing across all order quantities. There is no minimum order quantity for custom projects, and we maintain dedicated cells for both low-volume and high-volume production.
Surface Finishing Options
We offer a comprehensive range of surface finishes to meet functional and aesthetic requirements. Available finishes include as-cast, shot blasting, glass bead blasting, pickling and passivation, electropolishing, mechanical polishing, mirror polishing, grinding, sanding, vibratory finishing and various coating options. Stainless steel parts can be supplied with food-grade surface finishes suitable for dairy, beverage and pharmaceutical applications. All finishing processes are controlled to ensure consistent appearance, corrosion resistance and dimensional compliance.
CNC Machined Investment Casting Stainless Steel Parts
The following examples represent our typical range of cnc machined investment casting part products. We manufacture fully custom cnc machining stainless steel part components based entirely on your drawings and samples. Every cnc machined precision investment casting stainless steel part from China is produced to your exact specifications with consistent quality and repeatable dimensions.
Manufacturing and Inspection Process
Our precision cnc machined investment casting stainless steel part production is supported by a complete in-house machining and quality inspection system. We combine advanced CNC equipment with rigorous metrology and testing procedures to ensure every part meets dimensional accuracy, material integrity and performance requirements.
CNC Milling
Our CNC milling centers produce complex 3D geometries, flat surfaces, pockets, slots, holes and contoured features with high precision. 3-axis and 5-axis milling capabilities allow us to machine investment castings from all sides in a single setup, reducing handling errors and improving positional accuracy. We process stainless steel castings with solid carbide tooling, high-pressure coolant and optimized cutting parameters to achieve excellent surface finish and tight tolerances.
CNC Turning
CNC turning operations produce cylindrical features, external and internal threads, grooves, tapers and precision bores on investment cast stainless steel parts. Our turning department includes horizontal lathes, vertical lathes and Swiss-type turning machines equipped with live tooling for combined milling and turning operations. We maintain strict control over dimensional tolerances, concentricity, runout and surface finish throughout the turning process.
2D Projector Measurement
Optical profile projectors are used for non-contact dimensional inspection of complex profiles, contours, angles, radii and stamped features. This equipment allows rapid and accurate measurement of 2D geometries by projecting a magnified silhouette of the part onto a measurement screen. We use profile projectors for first-article inspection, in-process checks and final verification of intricate shapes that are difficult to measure with conventional calipers and micrometers.
CMM Testing
Coordinate Measuring Machines (CMM) provide high-precision 3D dimensional verification of complex machined castings. Our CMM equipment measures geometric features, positions, distances, angles, form tolerances and positional tolerances with sub-micron accuracy. We perform full CMM inspection reports for first-article approval, critical dimensional features and periodic process capability studies. All measurement equipment is calibrated and traceable to international standards.
Stainless Steel Grades, Tolerances and Surface Quality
Every cnc machined investment casting part is produced from stainless steel grades conforming to major international standards. Our silica sol investment casting process delivers industry-leading dimensional accuracy and surface integrity, which are further refined through cnc machining stainless steel part operations. Below is a detailed reference of standard material grades and achievable tolerances for every cnc machined precision investment casting stainless steel part from China.
Stainless Steel Investment Casting Grades by Standard
We manufacture investment castings in austenitic, martensitic, ferritic, duplex and precipitation hardening stainless steels, with full cross-reference to Chinese, American, European, British and Japanese material standards. All grades are available in cast form and can be supplied as raw castings or fully finished machined components.
Austenitic Stainless Steels
China GB/T: ZG06Cr19Ni10, ZG022Cr19Ni10, ZG06Cr17Ni12Mo2, ZG022Cr17Ni12Mo2, ZG06Cr18Ni11Ti USA ASTM / ACI: CF8, CF3, CF8M, CF3M, CF8C; AISI / ASTM 304, 304L, 316, 316L, 321, 347 EU EN / DIN: GX5CrNi19-10 (1.4308), GX2CrNi19-11 (1.4309), GX5CrNiMo19-11-2 (1.4408), GX2CrNiMo19-11-2 (1.4409) UK BS: 304C15, 304S11, 316C16, 316S11, 321S12 Japan JIS: SCS13, SCS14, SCS16, SCS19, SUS304, SUS304L, SUS316, SUS316L, SUS321
Martensitic & Ferritic Stainless Steels
China GB/T: ZG20Cr13, ZG30Cr13, ZG10Cr17 USA ASTM / ACI: CA15, CA40, CB7Cu-1, 410, 420, 430 EU EN / DIN: GX20Cr14 (1.4027), GX40Cr14 (1.4029), GX7CrNi14 (1.4008) Japan JIS: SCS1, SCS2, SUS410, SUS420J1, SUS430
Duplex & Precipitation Hardening Steels
Duplex grades: 2205 (EN 1.4462, ASTM S31803 / S32205), 2507 super duplex, CD4MCu Precipitation hardening: 17-4 PH (EN 1.4542, ASTM A564 630, SUS630), 15-5 PH, 17-7 PH These grades provide higher strength, improved corrosion resistance and superior wear resistance compared to standard austenitic stainless steels, and are widely used for valve components, pump parts, marine hardware and high-load mechanical components.
We also supply custom alloy modifications and special chemistries according to customer specifications. All melts are verified by optical emission spectrometry and supplied with full chemical composition reports. Heat treatment is performed to achieve the required mechanical properties including tensile strength, yield strength, elongation and hardness.
Investment Casting Tolerances and Surface Quality
The dimensional accuracy and surface finish of a cnc machined investment casting part depend on part geometry, size, wall thickness, alloy type and production process. Our silica sol investment casting process achieves tighter tolerances and finer surface finishes than conventional sand casting or water glass investment casting processes.
As-Cast Dimensional Tolerances
Standard as-cast dimensional tolerances follow ISO 8062-3 CT6 to CT8 grade for silica sol investment castings. For nominal dimensions up to 100 mm, typical linear tolerances range from ±0.20 mm (CT6) to ±0.40 mm (CT8). For dimensions between 100 mm and 200 mm, tolerances range from ±0.30 mm to ±0.55 mm. Wall thickness tolerances are typically ±0.20 mm to ±0.30 mm for sections up to 10 mm, and ±0.30 mm to ±0.50 mm for thicker sections. Angular tolerances are generally within ±0.5° to ±1.0° depending on feature size and geometry.
CNC Machined Tolerances
After precision machining, cnc machining stainless steel part components can achieve much tighter tolerances. Standard machined linear tolerances are IT6 to IT7 grade, with critical features held within ±0.01 mm. Hole diameters are typically held to H7 tolerance, and shaft diameters to h6 or h7. Position tolerances for holes and features are held within ±0.02 mm to ±0.05 mm, concentricity within 0.02 mm to 0.05 mm, and flatness within 0.01 mm to 0.03 mm over 100 mm. Threads are produced to ISO, UNC, UNF, NPT, BSP and G standards with appropriate class of fit.
Surface Roughness and Surface Integrity
As-cast surface roughness from silica sol investment casting typically ranges from Ra 1.6 μm to Ra 6.3 μm, depending on alloy and part size. After shot or glass bead blasting, surface roughness ranges from Ra 3.2 μm to Ra 12.5 μm. CNC machined surfaces achieve Ra 0.8 μm to Ra 3.2 μm for standard milling and turning operations, and Ra 0.2 μm to Ra 0.8 μm for ground and polished surfaces. Electropolished surfaces can reach Ra 0.1 μm to Ra 0.4 μm with a smooth, reflective, corrosion-resistant finish suitable for sanitary and food-grade applications.
Surface quality requirements are defined according to customer specifications and include acceptance criteria for surface porosity, inclusions, shrinkage, cold shuts and other casting defects. We perform visual inspection, dimensional verification and non-destructive testing as required to ensure every cnc machined precision investment casting stainless steel part from China meets the specified quality standards before shipment.
Technical Specifications
Casting Specifications
Our cnc machined investment casting part production covers a weight range from approximately 5 grams up to 50 kilograms per piece, with maximum overall dimensions suitable for most industrial applications. Wall thicknesses can be as thin as 1.5 mm in selected areas, depending on alloy selection and part geometry. Standard casting dimensional tolerances follow CT6–CT8 grade according to ISO 8062, with tighter tolerances achieved through subsequent CNC machining. Casting surface roughness typically ranges from Ra 1.6 to Ra 6.3 μm in the as-cast condition, and can be improved to Ra 0.8 μm or better through machining and polishing operations.
We use silica sol ceramic shell systems for superior surface finish and dimensional stability. Wax injection is performed under controlled temperature and pressure conditions to ensure consistent pattern quality. Shell building, dewaxing, preheating, pouring and shakeout are all carried out according to documented process parameters. Heat treatment is performed as required, including solution annealing, quenching, tempering, aging and stress relieving to achieve the specified mechanical properties.
Machining Specifications
Every cnc machining stainless steel part is produced to the dimensional tolerances specified on customer drawings. Standard machining tolerances include linear dimensions within ±0.01 mm for critical features, hole diameter tolerances of H7, position tolerances of ±0.02 mm, concentricity within 0.02 mm and surface roughness down to Ra 0.8 μm for turned and milled surfaces. Threads are produced to ISO, UNC, UNF, NPT, BSP and other standard thread forms, with class of fit as specified. We can also achieve tighter tolerances through grinding, honing and lapping operations for high-precision applications.
All machining programs are verified before production, and first-article inspection is performed on every new setup. In-process inspection is conducted at defined intervals throughout the production run to ensure process stability and conformance. Final inspection includes dimensional verification, visual examination, surface finish assessment and any additional tests requested by the customer.
Applications and Industries
Fluid Control & Valve Industry
Our cnc machined precision investment casting stainless steel part from China is widely used in the valve and fluid control industry. Typical applications include valve bodies, bonnets, discs, seats, stems, manifolds, pump housings, impellers and fittings for ball valves, gate valves, globe valves, check valves, butterfly valves and control valves. Investment cast stainless steel components offer excellent corrosion resistance, pressure containment and dimensional stability required for industrial piping systems, oil and gas, water treatment and chemical processing applications.
Food, Beverage & Pharmaceutical
We manufacture sanitary-grade cnc machining stainless steel part components for food processing, dairy, beverage, brewery and pharmaceutical equipment. Applications include pump bodies, valve components, fittings, manifolds, process equipment parts and custom hardware produced from 304 and 316L stainless steel with electropolished or mechanically polished surfaces. These parts meet the highest hygiene requirements and are designed for cleanability, corrosion resistance and compliance with food contact requirements.
Marine & Offshore Equipment
Marine and offshore applications demand superior corrosion resistance and mechanical strength in harsh saltwater environments. Our investment cast stainless steel parts are used for deck hardware, rigging components, valve bodies, pump parts, propulsion system components, structural fittings and custom marine hardware. We supply 316, 316L, duplex stainless steel and other corrosion-resistant alloys suitable for prolonged exposure to seawater, humidity and corrosive atmospheres.
Automotive & Industrial Machinery
We produce custom investment cast and machined components for automotive, commercial vehicle, construction machinery, agricultural equipment and general industrial applications. These include engine components, exhaust system parts, turbocharger components, brackets, housings, gears, shafts, couplings and custom structural parts. Our ability to produce complex geometries in stainless steel and high-alloy materials makes us a preferred supplier for parts that require both strength and corrosion resistance.
How We Work
Quotation & Review
Send us your drawings, 3D models, samples or part specifications along with quantity requirements and target delivery schedule. Our engineering team reviews the design for castability and manufacturability, and provides a detailed quotation with lead time, pricing and process description.
Tooling & Sampling
Upon order confirmation, we produce tooling and wax patterns according to your design. First sample castings are produced, machined and inspected according to drawing requirements. First article inspection reports and sample parts are submitted for your approval before mass production.
Production & Machining
Full production begins after sample approval. Investment casting, heat treatment, CNC machining, surface finishing and inspection are performed according to the approved process plan. We maintain full traceability throughout production and conduct in-process quality checks at every stage.
Delivery & Support
Finished parts are carefully packaged and shipped according to your requirements. We provide ongoing technical support and can accommodate design changes, repeat orders, blanket orders and scheduled releases. Our quality team is available to address any questions or concerns.
Why Choose Our CNC Machined Investment Casting Solutions
As an experienced manufacturer of cnc machined investment casting part components, we combine advanced casting technology, precision CNC machining and comprehensive quality control to deliver high-quality stainless steel parts at competitive prices. Every cnc machining stainless steel part is produced with strict attention to dimensional accuracy, material properties and surface finish. Our cnc machined precision investment casting stainless steel part from China serves customers worldwide with reliable quality, flexible production and responsive service.
Whether you need a single custom component or large-scale serial production, we have the capabilities, expertise and equipment to meet your requirements. We work directly from your drawings and samples, manufacture to your exact specifications and deliver finished parts ready for assembly. Our integrated production approach ensures consistent quality, shorter lead times and cost-effective solutions for all your stainless steel investment casting and CNC machining needs.