Steel for CNC machining

CNC Metal Materials List

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Steel 1018

Generally referred to as mild steel, 1018 is highly weldable and well suited to surface hardening processes such as carburizing. Once carburized, this material is typically used for gears, worms, and mold components.

Steel 1018 Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
31078201317.87

Steel 4130

This type is often known as alloy steel due to its increased levels of alloying elements when compared to normal mild steel. This alloy contains chromium and molybdenum as strengthening elements. These elements significantly improve its mechanical properties. Applications can include taps, drills, and aircraft engine mountings.

Steel 4130 Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
4608021.52177.85

Steel 4140

Steel 4140 is very similar to 4130 but has an increased carbon content. The bonus carbon improves its strength and allows for better hardening properties. Extra chromium is also added for corrosion resistance. Applications can include thin-walled pressure vessels, spindles, and high-strength bolts.Steel 4140 Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
6558025.71977.85

Steel 4140 PH

This grade of steel is a pre-hardened version of standard 4140 steel that exhibits excellent mechanical strength and hardness properties. Its pre-hardening eliminates the need for heat treatment after machining. This is ideal if the heat treatment will cause unacceptable distortion in the finished part. Typical applications include shafts, arbors, and molds.Steel 4140 PH Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
124180144297.8

Steel A36

This grade of steel is inexpensive and easy to weld, so it is a very common grade of low carbon steel. It is generally used in fabrication applications and structural supports.Steel A36 Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
25079.3201197.85

Steel 1215

This grade of steel is considered a free machining steel due to its high sulfur content. However, the weldability of this material is poor. Typical applications can include studs, screws, pins, and, in general, components that require large amounts of machining.Steel 1215 Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
41580101677.87

Steel 4340

This steel is a high-strength, low-alloy metal. It exhibits impressive toughness and strength and maintains these properties at relatively high temperatures. Typical applications can include gears, shafts, and other structural parts.Steel 4340 Properties

Tensile Strength, Yield (MPa)Shear Modulus (GPa)Elongation at Break (%)Hardness (Brinell)Density (g/cm^3)
47074222177.85

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