4140 Steel

4140 Steel is a verstatile alloy used in the tooling and other high-strength applications.

4140 steel

4140 is commonly used for a variety of applications in the oil and gas sector. 

4140 is composed of chromium, molybdenum, and manganese. This low alloy steel is ideal where its high fatigue strength, torsional strength, abrasion resistance, and toughness make it ideal for a number of applications.

Here at Wisconsin Metal Tech, we supply Tyee 4140 for many applications. Contact us for the most competitive prices. You can read more about 4140 here

440 Stainless Steel Properties and Specifications

4140 Properties and Specifications

4140 steel is a chromium-, molybdenum-, and manganese-containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.

  • 4140 steel hex bar has an unpolished surface with standard tolerance.
  • SAE 4140 grade is low-alloy steel that contains chromium and molybdenum as strengthening agents.
  • Its characteristics include high strength and good machinability and can be heat treated for higher hardness.
  • This steel alloy is very versatile and has good atmospheric corrosion resistance and maintains its strength up to 600º F.
  • Used throughout many industries including automotive, agricultural, and defense industries.
  • This steel is often used in gears, shafts, spindles, fixtures, jigs, and collars.
  • Readily machinable.
  • Simple shapes are easily machined following a normalizing treatment while more complex shapes may require annealing.
  • This steel grade’s carbon level may require a structure of coarse lamellar pearlite to coarse spheroidite for optimum machinability.
  • Heat treatment allows for a higher hardness and renders the steel suitable for machining.
  • There are several ways to heat treat a given steel part, Wisconsin Metal Tech’s steel specialists have many years of experience with this process.
  • Forgings may be annealed by transferring parts from forge to a furnace held at a suitable temperature before furnace cooling.
  • This heat treatment is best used for parts with simple shapes.
  • Normalizing heats the 4140 to a temperature above the ferrite to austentite transformation range before cooling it in the air to a temperature below the transformation range.
  • This is often performed as a conditioning treatment before final heat treatment.
  • Hardening results in the formation of martensite after quenching, to produce a greater hardness and tensile strength with some loss of ductility.
  • Should be austenitized at 1500º to 1550º F.
  • Often, tempering is then carried out to relieve stresses from the hardening process and primarily used to bring the 4140 to its required properties.