8740 Alloy Round Bar Stock

8740 Alloy bar stock is a nickel-chromium-molybdenum low-alloy steel that has incredibly good hardenability, strength, and toughness properties.

8740 alloy bar stock that has incredibly good toughness properties

8740 Alloy bar stock is a nickel-chromium-molybdenum low-alloy steel that has incredibly good hardenability, strength, and toughness properties. 8740 alloy round bar stock finds its uses in a number of applications where strength, toughness, and wear resistance are taken into high consideration as it plays vital importance when forging this kind of metal. This alloy is particularly used as high-forged fasteners. The chemical composition of 8740 alloy bar stock consists of Carbon 0.38 – 0.43. Manganese 0.75 – 1.00, Phosphorus 0.035 max, Sulfur 0.040 max, Silicon 0.20 – 0.35, Nickel 0.40 – 0.070, Chromium 0.80 – 1.10, and Molybdenum 0.15 – 0.25. Based on its chemical analysis alone it is fair to see why this metal is forged at a starting temperature of around 2200F (1205C) and can be forged down to approximately 1700F (925C).

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Advance Grinding has the right kind of steel that you need to help you keep up with your business or latest venture. Our 8740 alloy round bar stock is the perfect alloy steel metal that’s best for forging things that carbon steel cannot provide. If you want to acquire the best metal forged in the industry, then you’ll be happy to know that Advance Grinding can provide you with just that. Our Alloys are influenced by both the thermal treatment and the alloying elements that are present during their production. We understand the value of supplying our clients with quality metal, which is precisely why you should trust us, to supply you with top-tier, high-quality metals. Contact us today so that you can get a quote on the alloy that you need. We’ll make sure that you’re equipped to take on any project you have to face by providing you with hardy material that you can rely on.


As such, it is now understandable why this type of alloy steel is sought after getting a quick review of its components.

Consequently, its high machinability is highlighted as it is commonly combined with sulfur to further improve its machinability and make carburizing processes more effective.

With its excellent machinability, this even elevated this alloy steel’s prominence among industries.

Fortunately, Advance Grinding Services never runs out of 4140 alloy steel bars and can very much supply your needs especially if you are operating in the Illinois area!


Density 7.7-8.0
Tensile Strength 95000 psi
Yield Strength 60200 psi
Hardness (Brinell) 197
Hardness (Knoop) 219
Hardness (Rockwell) 92
Hardness (Vickers) 207
Machinability 65


With excellent toughness, high fatigue strength, and outstanding machinability, 4140 Alloy Steel has indeed become a staple for most industries in the Midwest.

For the automotive industry, 4140 alloy steel is used in the creation of engine gears, bolts and nuts, and crankshafts while for the oil and gas industry, 4140 alloy steel is utilized in the creation of spindles, couplings, and other mechanical parts.

Whatever industry you are from, rest assured that Advance Grinding Services can provide you with a 4140 alloy steel round bar stock for all your specific industry applications.

Give us a call or simply request a quote from our website and acquire a high-quality 4140 alloy steel round bar stock today!