Steel

1018 steel cnc material

At a Glance

Process

Lead Time

Finish Options

Tolerance

Price

Applications

As fast as 3 days
Depending on the alloy, electropolishing, media blasting, and powder coating are options.
With drawing: as low as +/- 0.005 mm
No drawing: ISO 2768 medium
$$$
fixtures and mounting plates; draft shafts, axles, torsion bars

About the Material

1018 Steel is a mild, low carbon steel that is machinable, weldable and useful where high-strength is not required, such as fixtures and mounting plates. It is magnetic and heat treatable.

4140 alloy steel is generally harder and stronger than carbon steel. Additionally, it provides high impact resistance, fatigue strength, and torsional strength, which makes 4140 a great choice for drive shafts, axles, and torsion bars. In terms of hardening, 4140 can be hardened using a variety of methods such as cold working, or heating and quenching.

1045 Carbon Steel is stronger than low carbon steel (1018 Steel) but is easy to machine. It is heat treatable and can be used for bolts, studs and shafts.

4130 Alloy Steel is similar to 4140 Alloy Steel but offers better weldability and has a slightly lower carbon content. It is best suited for gears and other structural applications.

Zinc-Galvanized Low-Carbon Steel has an outer coating of zinc to improve corrosion resistance. It is important to note that the coating will only be present on non-machined areas.

A514 Alloy Steel is a high strength, low alloy steel that is used mainly in structural applications. It is weldable, heat treatable and is best suited for supporting heavy loads.

4340 Alloy Steel is a medium carbon, low alloy steel that is highly useful in environments involving extreme impact, heat, and wear.

Material Properties

1018 Low Carbon Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

60,000 psi
15%
Rockwell B90
7.87 g/㎤
0.284 lbs / cu. in.

4140 Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

60,000 psi
21%
Rockwell C15
7.87 g/㎤
0.284 lbs / cu. in.

1045 Carbon Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

77,000 psi
19%
Rockwell B90
7.87 g/㎤
0.284 lbs / cu. in.

4130 Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

122,000 psi
13%
Rockwell C20
7.87 g/㎤
0.284 lbs / cu. in.

Zinc-Galvanized Low-Carbon Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

30,000 psi
23%
Rockwell B65
7.87 g/㎤
0.284 lbs / cu. in.

A514 Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

100,000 psi
18%
Rockwell C20
7.87 g/㎤
0.284 lbs / cu. in.

4340 Steel

Yield Strength (tensile)

Elongation at Break

Hardness

Density

122,000 psi
13%
Rockwell C20
7.87 g/㎤
0.284 lbs / cu. in.

Material Finish

Design Recommendations

Min Wall Thickness

Min End Mill Size

Min Drill Size

Max Part Size

Undercuts

Radii : Depth

0.5 mm
0.8 mm
(0.03 in)
0.5 mm
(0.02 in)
1200 x 500 x 152 mm [x,y,z] (mill) 

152 x 394 mm 
[d,h] (lathe)
Square profile, full radius, dovetail profiles
Depth must not exceed 12x drill bit diameter.
For end mills, depth must not exceed 10x tool diameter.

Cost Saving Tip

To reduce costs, limit the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii.

Related Resources

Engineer's Guide to CNC Machining for Prototyping Hardware
Fictiv CNC Material Datasheet