Carbon Steel CNC Machining Service
XC Machining machines custom carbon steel parts for US product teams, from one-off prototypes to repeat production runs. We cut 1018, 1020, 1045, 1215, 12L14 and A36 for brackets, shafts, housings, fixtures, manifolds and other precision parts.
Carbon Steel in CNC Machining
Carbon steel gives you high strength, rigidity and durability at a low material cost. Low-carbon grades such as 1018 and 1020 machine and weld well. Medium-carbon grades such as 1045 give higher strength and can be heat treated for demanding mechanical parts.
Unlike stainless steel, carbon steel does not resist corrosion on its own. Exposed parts need black oxide, nickel plating, paint, powder coating or another protective finish. XC cuts carbon steel by CNC milling, CNC turning, drilling, threading and precision finishing. Our materials page lists every other metal and plastic we cut.
| Property | Carbon steel CNC machining |
|---|---|
| Grades | 1018, 1020, 1045, 1215, 12L14, A36 |
| Price | Low |
| Lead time | 5 to 10 business days |
| Minimum wall thickness | 0.8 mm |
| Standard tolerance | ±0.125 mm (±0.005 in) |
| Tighter features | Down to ±0.005 mm where geometry allows |
| Maximum part size | Up to 2000 × 1500 × 800 mm |
| Finishes | As-machined, black oxide, nickel plating, brushing, painting, powder coating |
Carbon Steel Grades
Each card gives the use first and the figures after it. The figures keep the labels on XC’s own table, and the units are MPa, Brinell hardness and g/cm³. Ask for the mill certificate of your grade and condition before you lock a design to them.
1018 Carbon Steel CNC Machining
1018 is our go-to mild steel for general-purpose machined parts. It balances strength, machinability, weldability and cost. It works well for shafts, pins, fixtures, brackets, spacers and machine components.
1020 Carbon Steel CNC Machining
1020 is another low-carbon steel that forms, welds and machines well. Teams pick it for bushings, shafts, mounting parts, structural parts and general machinery where extreme hardness is not needed.
1045 Carbon Steel CNC Machining
1045 holds more carbon than 1018 and 1020, which gives it higher strength and better wear resistance. It suits shafts, gears, axles, studs and machine components. It also fits parts that need flame, induction or conventional heat treatment.
1215 Carbon Steel CNC Machining
1215 is a free-machining carbon steel made for fast cutting and good chip control. It suits CNC turning and high volume runs of fittings, bushings, spacers, threaded parts, fasteners and other small precision parts.
12L14 Carbon Steel CNC Machining
12L14 is one of the easiest steels to machine. It is a strong option for high volume turned parts with fine threads, grooves and small features. Uses include fittings, bushings, couplings, fasteners and automatic screw-machine parts.
A36 Carbon Steel CNC Machining
A36 is an economical structural steel supplied as plate, bar and structural sections. It is a practical pick for large brackets, machine bases, mounting plates, welded fixtures and frames. Choose it where cost and weldability matter more than tight control of material properties.
Advantages and Limitations of Carbon Steel
Carbon steel is a strong, low cost choice for machined parts, but it is not the right material for every job. Here is where it performs well and where it falls short.
- High strength and rigidity. — It suits structural and load-bearing mechanical parts.
- Cost effective. — It costs less than stainless steel and most specialty alloys.
- Good machinability. — Grades such as 1018, 1215 and 12L14 cut especially well.
- Good weldability. — Low-carbon grades including 1018, 1020 and A36 weld particularly well.
- Heat-treatable options. — Medium-carbon grades such as 1045 can be hardened for more strength and wear resistance.
- Widely available. — Common grades come in plate, bar, tube and other stock forms.
- Broad finishing options. — Black oxide, plating, paint and powder coating improve looks and corrosion protection. Our surface finishing page lists the full menu.
- Low natural corrosion resistance. — Unfinished carbon steel rusts when it meets moisture.
- Higher weight than aluminum. — It is a poor fit when low mass is the main goal. Aluminum weighs about a third as much.
- Harder grades add machining time. — Higher-carbon and heat-treated steel wears tools faster.
- Hot-rolled stock may carry scale. — A36 and similar steel can need extra facing or finishing.
- Not every grade welds well. — Free-machining steels such as 1215 and 12L14 are poor choices for welded structures.
- Heat treatment can change dimensions. — Critical features may need finish machining or grinding after hardening.
- 12L14 contains lead. — That can limit its use in regulated or environmentally sensitive applications.
Bring Your Designs to Life with XC Machining
Experience precision engineering with XC Machining. From detailed prototypes to high-volume production, we’re here to turn your concepts into reality. Contact us today to discuss your project needs!
- 50+ CNC machines in-house
- 60+ materials in stock
- 120+ countries shipped
- 15+ DFM engineers on staff
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Carbon Steel CNC Machining FAQs
Why is carbon steel used for CNC machining?
Carbon steel combines mechanical strength, durability and low cost. That mix makes it a common base for precision shafts, gears, brackets, fasteners and industrial machinery parts that need reliable structural performance. It also machines well, welds in most grades and takes a range of finishes, so one material covers a wide range of jobs.
Which carbon steel grade is best for CNC machining?
The best grade depends on the job. AISI 1018 offers good machinability and weldability for general-purpose parts. AISI 1045 gives higher strength and wear resistance. AISI 12L14 is a frequent pick for high-speed precision turning because it cuts so easily. If you are unsure, send the drawing and we will suggest a grade.
Is carbon steel easy to CNC machine?
Most carbon steel grades machine well, but cutting performance depends on carbon content, hardness and material condition. Low-carbon and free-machining steels cut more easily. Higher-carbon or hardened grades need harder tooling and tuned cutting parameters. Tell us the hardness you need, because it changes both lead time and cost.
Can carbon steel be CNC machined to tight tolerances?
Yes. Our standard tolerance is ±0.125 mm (±0.005 in), and tighter features can reach ±0.005 mm where the geometry allows. What we can hold depends on the grade, part shape and heat treatment. Call out the critical features on the drawing so we can plan the setup around them.
What are the common applications of carbon steel CNC machined parts?
Carbon steel parts go into automotive systems, industrial machinery, construction equipment, agricultural equipment and mechanical assemblies. Parts include shafts, gears, bushings, mounting brackets, fasteners and custom precision parts. Send a drawing for any of these and we will quote the grade and finish that fit your load and budget.