Stainless Steel CNC Machining Services
Send us your drawings and specifications for custom stainless steel parts. JeaSnn provides drawing-based CNC machining for prototypes and production orders, with material grade, dimensional requirements, and part features reviewed according to each project.
Stainless Steel for CNC Machined Parts
Selecting stainless steel for a machined part requires more than specifying corrosion resistance. The appropriate grade depends on the service environment, mechanical requirements, operating temperature, and how the material behaves during machining. These factors should be evaluated against the drawing and the actual conditions in which the part will be used.
Corrosion Resistance & Environment
Corrosion resistance varies by grade and service environment. Consider what the part will be exposed to, including moisture, chemicals, chlorides, and other corrosive conditions, before selecting a stainless steel grade.
Mechanical Requirements
Different stainless steel families, grades, and material conditions provide different levels of strength, hardness, ductility, and toughness. Select the material according to the loads and mechanical demands the finished part must withstand.
Temperature & Service Conditions
If the part will operate at elevated or low temperatures, material performance should be evaluated under those conditions rather than at room temperature alone. Temperature can affect both mechanical performance and corrosion behavior.
Machining Behavior
Stainless steel grades can behave differently during CNC machining. Cutting forces, heat generation, chip control, and work-hardening tendency may affect machining strategy, especially for parts with tight tolerances or detailed features.
Stainless Steel Grades for CNC Machining
Stainless steel grades differ in corrosion resistance, mechanical properties, and machining behavior. Use the comparison below as an initial material reference, then confirm the grade, material condition, and any applicable heat-treatment requirements against your drawing and service conditions.
| Grade | Key Characteristics | Machining Considerations | Consider When |
|---|---|---|---|
| 303 | Good machinability with moderate corrosion resistance | Sulfur improves machinability and chip breaking, but reduces corrosion resistance compared with 304 | Machinability is important and the service environment does not require the corrosion resistance of 304 or 316 |
| 304 | General-purpose corrosion resistance with balanced mechanical properties | Austenitic structure can cause work hardening during machining, requiring appropriate cutting conditions | The part requires a practical balance of corrosion resistance and mechanical performance |
| 316 | Greater resistance to pitting and crevice corrosion than 304 in many chloride-containing environments | Similar to 304 in machining behavior, with attention required for work hardening and cutting heat | The service environment requires greater corrosion resistance than 304 can provide |
| 316L | Low-carbon version of 316 with similar general corrosion resistance | Machining behavior is broadly similar to 316; the low-carbon content is more relevant to welding and sensitization | The drawing specifies 316L or subsequent welding makes the low-carbon grade relevant |
| 420 | Martensitic stainless steel that can be hardened by heat treatment | Machinability varies with material condition and hardness; the required heat-treatment condition should be defined | Hardness, wear resistance, or heat-treatable mechanical properties are important |
| 430 | Ferritic stainless steel with useful corrosion resistance in suitable environments | Machining behavior differs from austenitic grades and varies with material condition | A ferritic stainless steel is specified and its corrosion and mechanical properties meet the part requirements |
| 17-4PH | Precipitation-hardening stainless steel combining high strength with corrosion resistance | Mechanical properties and machining behavior depend strongly on heat-treatment condition | Higher strength and corrosion resistance are required with a defined material or heat-treatment condition |
Stainless Steel Parts We Machine
Explore stainless steel parts manufactured by JeaSnn based on customer drawings and specifications.
Surface Finishes for Stainless Steel Parts
Stainless steel parts can be finished to meet different appearance, surface, and functional requirements. JeaSnn offers multiple finishing options for custom stainless steel parts. The appropriate finish should be selected according to the material grade, drawing requirements, and intended service conditions.
Polishing
Creates a smoother stainless steel surface and reduces visible machining marks. The required polishing level should be defined according to the specified appearance or surface-finish requirement.
Passivation
Removes free iron and surface contamination introduced during manufacturing, helping maintain the corrosion-resistant condition of the stainless steel surface.
Brushing
Creates a controlled directional grain on the stainless steel surface, typically selected when a consistent linear texture and appearance are required.
Sandblasting
Produces a uniform matte or textured surface. Abrasive media and process control should be suitable for stainless steel to minimize the risk of unwanted surface contamination.
PVD Coating
Applies a thin deposited coating when the part requires a specified color, appearance, wear-related property, or other functional surface characteristic.
Powder Coating
Adds a cured coating when color, appearance, or additional surface protection is required beyond the exposed stainless steel surface.
Applications of Stainless Steel Machined Parts
Stainless steel machined parts are used across a range of applications where material performance, durability, and service conditions need to meet specific part requirements. Explore examples of stainless steel parts manufactured for different applications below.
Stainless Steel CNC Machining FAQ
1. What information should I provide for a stainless steel machining quote?
Please provide your drawing or CAD file, stainless steel grade, quantity, required tolerances, surface finish, and any applicable material or heat-treatment condition. Critical dimensions and special requirements should be clearly identified so they can be reviewed before production.
2. Can tight tolerances be achieved on stainless steel parts?
Yes, but achievable tolerances depend on the part size, geometry, material grade and condition, feature relationships, and machining requirements. Critical tolerances should be identified on the drawing and reviewed for the specific part rather than applying one tolerance value to every feature.
3. What if I am not sure which stainless steel grade to specify?
Start with the part’s service environment and functional requirements, including corrosion exposure, mechanical requirements, temperature, and any subsequent manufacturing processes. If the material has not been finalized, provide these requirements with your drawing so the available grade options can be reviewed for the project.
4. Should stainless steel parts be heat treated before or after machining?
There is no single sequence for every stainless steel grade. The appropriate sequence depends on the grade, required material condition, final hardness or mechanical properties, and dimensional requirements. For heat-treatable grades, the required condition and process sequence should be established before production.
5. Can critical dimensions be controlled after surface finishing?
They can be planned for, but the effect depends on the finishing process and the feature involved. If dimensions, threads, bores, or mating surfaces are critical in the finished condition, identify them on the drawing and specify whether the requirement applies before or after finishing.
Cost-efficient Machined Parts at Any Quantity
Upload your CAD file and get a quote with free DFM feedback within 24 hours. From rapid prototypes to mass production — flexible volumes to fit your project.