Mild Steel CNC Machining Services
Custom mild steel CNC machining service for OEM low carbon steel components. All parts meet ±0.01 mm tolerance verified by CMM inspection, with complete surface treatment options. Submit CAD drawings for a fast, accurate quotation.
- Competitive Prices & DFM
- Tolerances up to ±0.01 mm
- 3-axis, 4-axis, and 5-axis CNC machining
- Parts delivered in as fast as 3 days
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Mild Steel CNC Machining
Mild Steel CNC Machining Services cover precision manufacturing of low-carbon steel components with carbon content typically below 0.25%, composed primarily of iron with small amounts of carbon and trace alloying elements. It offers a balanced combination of strength, ductility, and weldability, along with low hardness and a stable material structure, resulting in good machinability and predictable cutting behavior during CNC milling, turning, and drilling operations.
Mild Steel CNC Machining Services support stable machining cycles, efficient material removal, and consistent dimensional accuracy, making them suitable for both CNC prototyping and scalable production with relatively short lead times. Its cost efficiency and processing stability enable reliable batch manufacturing for industrial components such as automotive parts, machinery structures, and general engineering assemblies. As a carbon steel, mild steel is prone to oxidation and typically requires surface protection depending on the application environment.
CNC Machining Capability in Mild Steel
| Feature | Detail |
|---|---|
| Price Level | $$ |
| General Tolerances | ±0.01 mm |
| Smallest Roughness | Ra1.6μm |
| Maximum Part Size | 4000 mm×1500 mm×600 mm |
| Sample Lead Time | 3–5 business days, rush service available |
| Small Batch Lead Time | 10–15 business days |
| Supported Mild Steel Grades | A36, 1018, S235JR Low Carbon Steel |
1018 mild steel is the most widely used low carbon steel for CNC machining. It features great machinability, ductility and weldability with low material cost. It can be carburized for surface hardness, suited for jigs, brackets, shafts, flanges and general industrial structural components.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 310 | 170 | 30 | 126 | 7.87 |
A36 mild steel is a general structural low-carbon steel widely stocked in plate and bar stock. It offers stable mechanical performance and excellent weldability, mainly used for large machine bases, support frames, flanges and low-load structural parts without high wear resistance demands.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 250 | 140 | 23 | 110 | 7.87 |
S235JR follows EN 10025 European structural steel standard, the direct equivalent to A36 for EU markets. It balances machinability and welding performance, fully meeting European material certification requirements for automation frames, equipment bases and welded mechanical assemblies exported to Europe.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 235 | 130 | 25 | 105 | 7.87 |
Instant & Accurate Quotes
Submit your CAD files and get an instant, engineering-accurate quote. Plan your projects efficiently with reliable cost and production estimates for OEM or batch orders.
Surface Finishing Options for Mild Steel
We provide a full lineup of customizable surface finishing services for mild steel CNC machined parts. Every finish optimizes visual appearance, surface texture, rust prevention and coating adhesion, catering to varied technical requirements from European and North American OEM, automation and general machinery manufacturers.
As Machined
Original untreated surface with machining tool marks, economical choice for invisible internal structural components.
Black Oxide
Forms thin black rust-proof coating without altering part sizes, widely applied on precision functional steel parts.
Polishing
Removes machining traces to achieve smooth glossy finish, great for exterior decorative mild steel workpieces.
Sand Blasting
Creates consistent matte texture, clears surface imperfections and greatly improves adhesion for follow-up coatings.
What Is Mild Steel CNC Machining
Mild steel CNC machining refers to the computer numerical control subtractive manufacturing process that cuts, drills, mills and turns low-carbon mild steel blanks into custom mechanical components. Mild steel contains low carbon content, featuring good ductility, excellent weldability and affordable raw material cost, making it the most widely used metal for general industrial parts across European and North American OEM industries.
Our CNC equipment accurately shapes mild steel stock including round bars, flat plates and blocks to tight dimensional tolerances. Finished mild steel parts can be matched with multiple surface treatments such as sand blasting, polishing, black oxide and zinc plating to enhance appearance and anti-rust performance, covering applications in automation frames, equipment bases, fixture blocks, standard structural fittings and low-load mechanical assemblies.
Advantages of Mild Steel CNC Machining
1.Cost-Effective Raw Material: Mild steel features competitive raw material pricing, delivering significant cost savings for prototype iterations, small-batch orders and high-volume structural component manufacturing.
2.Superior Machinability: Low carbon composition enables smooth chip removal during turning, milling and drilling, minimizing cutting tool abrasion, shortening cycle times and sustaining consistent dimensional accuracy.
3.Excellent Formability & Weldability: High ductility eliminates cracking risks during post-process bending, welding and secondary forming, ideal for integrated welded assemblies.
4.Broad Compatibility with Surface Treatments: Fully adaptable to standard finishing processes including sand blasting, mechanical polishing, black oxide coating and zinc plating to satisfy corrosion resistance and aesthetic specifications.
5.Balanced Mechanical Performance: Sufficient tensile strength and rigidity to fulfill low-to-medium load working conditions, applicable to equipment frames, support bases, custom fixtures and general mechanical fittings.
6.Stable Material Supply Chain: Readily stocked blanks cover 1018 cold-drawn bars, A36 hot-rolled plates and S235JR structural steel, enabling rapid order fulfillment and shortened production lead times.
Applications of Mild Steel CNC Machined Parts
1.Automation Equipment：Custom frames, support bases, mounting brackets, fixture blocks, conveyor connecting plates and positioning jigs for automated production lines.
2.General Industrial Machinery：Bearing housings, pump valve bodies, transmission supports, low-load connecting parts and tool base blocks.
3.Automotive Auxiliary Components：Chassis brackets, fixed mounting supports, internal structural frames and non-stress assembly fittings.
4.Testing & Measurement Instruments：Equipment bases, adjustable stands, sensor mounting frames and protective structural shells.
5.Medical Auxiliary Devices：Light-duty support frames, instrument bottom bases and adjustable positioning brackets.
6.Welded Assemblies & Tooling：Weld-ready blanks, welding fixtures, assembly holders and custom jig components.
7.Aerospace Non-Critical Parts：Low-load auxiliary brackets, cabinet structural frames and assembly positioning blocks.
Frequently Asked Questions
A: Mild steel is relatively easy to machine due to its low carbon content and stable ferrite-pearlite structure. Its machinability allows CNC machining and CNC prototyping with minimal tool wear, consistent dimensional accuracy, and repeatable results for both prototypes and production parts.
A: For mild steel CNC machining, tolerances typically range from ±0.05 mm to ±0.1 mm depending on part geometry and process. CNC milling and turning at ZH Precision maintain tight tolerances across both prototypes and mass production components.
A: Costs depend on part complexity, size, quantity, and tolerance requirements. Mild steel’s excellent machinability reduces machining time and tool wear. ZH Precision provides detailed quotations based on drawings, optimizing pricing for both CNC prototyping and OEM production.
A: Yes. Mild steel supports CNC prototyping and full-scale manufacturing due to stable cutting performance and consistent mechanical properties. This ensures repeatable quality from initial design validation to large production runs.
A: Its good ductility, low cutting resistance, and weldability reduce tool wear and machining time. This improves CNC machining efficiency and ensures reliable repeatability for prototypes and production parts alike.