Alloy Steel 4140

4140 Chromium-Molybdenum Steel

Supplied in the annealed or prehardened condition. 4140 PREHARD is heat treated to a medium hardness (HRC 28/32) and is designated as 4140 HT. 4140 annealed is supplied in the soft condition and can be hardened to RC 40. 4140 HT is supplied in many forms such as hot rolled or turned, ground and polished rounds and DCF plate to be used as a holder material for high strength structural components. 4140 Prehard is stocked in a DCF, ground finished 4140 HT is available in plate, flat bar, or rounds Large Diameter 4140 HT in stock 4140 Prehard and Annealled Hollow Bar Tube Available.

We sell our trademark material Durelloy that is made to last and perform better than standard 4140

4140 Composition

  • Element Weight %
  • C 0.38-0.43
  • Mn 0.75-1.00
  • P 0.035 (max)
  • S 0.04 (max)
  • Si 0.15-0.30
  • Cr 0.80-1.10
  • Mo 0.15-0.25

4140 Mechanical Properties

4140 Hot Rolled:

Typical Tensile Strength: 89 KSI

Typical Yield Strength: 62 KSI

4140 Cold Rolled:

Typical Tensile Strength: 102 KSI

Typical Yield Strength: 90 KSI

4140 HT Oil Quenched & Tempered:

Typical Tensile Strength: 153 KSI

Typical Yield Strength: 131 KSI

Not sure what you are looking for? Contact Ameralloy Steel an ISO 9001 certified supplier that specializes in finding hard-to-find Stainless and Alloys. Along with our proprietary grades Amera-Braze, Durelloy, and Dura-Krome. Our knowledgeable sales team will help you find what you are looking for. With many shapes, sizes, and material grades available, we can help you find what you are looking for. The most common items stocked are Tube, Pipe, Sheet, Plate, Hex bar, Square bar, Round bar, Threaded bar, Pump Shaft, and Millimeter sizes. We offer added fabrication services. Contact us now for the current price and delivery.

Ameralloy Steel Corporation is a prime supplier of speciality steel bar products and wear-resistant high-impact steel plate. Our full catalogue features speciality steels and standard AISI alloys to meet your demanding applications.

Ameralloy’s precision-forged speciality steels and standard alloys are shipped worldwide with reliable on-time service.

Ameralloy provides engineering services for your steel products. From forging to machining and finishing, our Chicago based steel service centre will manufacture, ship, and deliver your order with unrivalled quality and service


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