What is Post-Investment-Casting Machining?

Post-investment-casting machining refers to precision CNC processing of near-net-shape stainless steel investment castings to achieve final dimensional accuracy, improve surface quality, and add functional features such as threaded holes, sealing surfaces, slots, and precision mating interfaces. Investment casting enables the production of complex, thin-walled stainless steel parts with excellent surface finish and minimal draft; subsequent CNC machining ensures that critical dimensions, tolerances, and surface integrity meet demanding industrial standards. This integrated approach is widely used in valves, pumps, medical instruments, food processing equipment, and chemical processing components.

Our Capabilities in Machining Investment-Cast Stainless Steel

We specialize in machining a wide range of stainless steel investment-cast grades, including 304, 316, 17-4PH, and duplex alloys. Our workshop is equipped with multi-axis CNC centers, precision grinding machines, and corrosion-resistant fixturing systems to handle cast stainless parts with high dimensional stability and surface consistency—from prototypes to production batches.

From Investment Casting to Finished Part

Submit your stainless steel casting design or sample for a comprehensive manufacturability and machining review. We provide integrated DFM feedback covering both casting design optimization and CNC machining strategy to ensure cost-efficiency, performance, and on-time delivery.

Common Stainless Steel Investment-Cast Materials We Machine

▪ 304 Stainless Steel – General-purpose, corrosion-resistant

▪ 316 Stainless Steel – Enhanced corrosion and chemical resistance

▪ 17-4PH – Precipitation-hardening, high-strength Duplex & Super

▪ Duplex Stainless Steels – For high-strength, chloride-resistant applications

▪ Other Austenitic & Martensitic Grades upon request

We can source cast blanks or machine your supplied castings.

Finishing & Surface Treatment Options

▪ Passivation – Restores corrosion resistance after machining

▪ Electropolishing – Improves surface smoothness and cleanliness

▪ Plating – Nickel, chrome, or other functional/decorative coatings

▪ Polishing – Mechanical or manual polishing to specified Ra levels

▪ Coating – PVD, ceramic, or FDA-approved food-grade coatings

▪ Heat Treatment – Solution annealing, aging, or stress relieving as needed

CNC Machining Service

At Xinchenda Metal, we use advanced equipment to offer you a variety of CNC machining services including CNC Machining,CNC Milling,CNC Turning,5-Axis CNC Machining Service,Swiss-type CNC Machining Services,Surface Finishing,Parts Assembly Service and much more. Using our imported 3, 4 and 5-axis CNC machining centers, our skilled machinists can make turned and milled parts using a wide range of plastic and metal materials.

From Concept to Production

We support your project from initial design to final part delivery. Upload your drawings to start a free project review and receive expert DFM feedback.

Available Materials

▪ Metals: Steel, aluminum, stainless steel, brass, copper, and more

▪ Plastics: Acrylic, PC, PEEK, PEI, Nylon, PP, PVC, and other engineering grades
Contact us for full material specifications

Advantages of CNC Machining

▪ High accuracy and repeatability

▪ Low tooling investment

▪ Broad material compatibility

▪ Efficient material removal

▪ Cost-effective for prototypes to mid-volume runs

▪ Fast turnaround and scalable production

Surface Finishing Options

We provide a range of finishes to meet aesthetic and functional requirements, including anodizing, painting, bead blasting, polishing, pad printing, and custom color matching.

Investment Casting+CNC Parts