Features	Info
Subtypes	4140, 4130, A514, 4340
Process	CNC machining, injection molding, sheet metal fabrication
Tolerance	With drawing: as low as +/- 0.005 mm No drawing: ISO 2768 medium
Applications	Fixtures and mounting plates; draft shafts, axles, torsion bars
Finishing Options	Black Oxide, ENP, Electropolishing, Media Blasting, Nickel Plating, Powder Coating, Tumble Polishing, Zinc Plating

Subtypes	Yield Strength	Elongation at Break	Hardness	Density
1018 Low Carbon Steel	60,000 psi	15%	Rockwell B90	7.87 g/㎤ 0.284 lbs / cu. in.
4140 Steel	60,000 psi	21%	Rockwell C15	7.87 g/㎤ 0.284 lbs / cu. in.
1045 Carbon Steel	77,000 psi	19%	Rockwell B90	7.87 g/㎤ 0.284 lbs / cu. in.
4130 Steel	122,000 psi	13%	Rockwell C20	7.87 g/㎤ 0.284 lbs / cu. in.
A514 Steel	100,000 psi	18%	Rockwell C20	7.87 g/㎤ 0.284 lbs / cu. in.
4340 Steel	122,000 psi	13%	Rockwell C20	7.87 g/㎤ 0.284 lbs / cu. in.

Steel, alloy of iron and carbon in which the carbon content ranges up to 2 percent (with a higher carbon content, the material is defined as cast iron). By far the most widely used material for building the world’s infrastructure and industries, it is used to fabricate everything from sewing needles to oil tankers. In addition, the tools required to build and manufacture such articles are also made of steel. As an indication of the relative importance of this material, iThe main reasons for the popularity of steel are the relatively low cost of making, forming, and processing it, the abundance of its two raw materials (iron ore and scrap), and its unparalleled range of mechanical properties.