8740 Alloy Round Bar Stock

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8740 Alloy Round Bar Stock

8740 Alloy is low-alloy nickel-chromium-molybdenum steel with excellent hardenability, strength, and toughness.

8740 ALLOY

This alloy is forged at a starting temperature of around 2200oF and can be forged as low as 1700oF(925oC).

After forging, the alloy should be slowly cooled, but it can also be transported to a furnace at a temperature close to the forging finishing temperature, soaked, and air-cooled.

A microstructure consisting of coarse lamellar pearlite to coarse spheroidite is regarded as ideal for this alloy’s machinability. Austenitizing at 1525oF, furnace cooling to 1340oF, then cooling to 1180oF at 20oF/hr can produce such a structure. An iso-anneal at 1225°F is another option.


AISI 8740 | UNS# G87400 is roughly equal alloy steel to AISI 4140. This alloy is being used in applications that require a high level of strength, hardness, and wear resistance. It’s extensively utilized as forged fasteners with great strength.

If you are one that requires this alloy steel material, Forte Precision Metals guarantees that you will receive the best 8740 Alloy bar stocks and 8740 Alloy round bar stocks that meet your requirements.

8740 Alloy Commonly Used for;

  • aircraft fasteners
  • tool joints 
  • engine bolts
  • axles
  • piston rods

8740 Alloy Properties

Physical Properties

Tensile Strength 

Yield Strength 


Hardness bhn





bhn 229

8740 Alloy Chemical Elements

Properties Imperial

Carbon .38 -.43%

Chrome 0.40-0.60 %

Manganese 0.75-1.00 %

Molybdenum 0.20 – .30%

Nickel 0.40 -0.70%

Phosphorus .035% max

Sulphur 0.04% max

Silicon 0.15- 0.30%


38 -.43%

0.40-0.60 %

0.75-1.00 %

0.20 – .30%

0.40 -0.70%

035% max

0.04% max

0.15- 0.30%

Forte Precision Metals is here for you if you need an efficient alloy steel round bar supplier and a centerless ground bar supplier who provides you with quality 8740 alloy bar stocks! We work closely with our clients to ensure that their precision ground bars are delivered to the correct specifications.

Get your 8740 Alloy bar stocks and 8740 Alloy round bar stocks now! Call us or request a quote!

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Contact info

Forte Precision Metals provide Precision Ground Bars & Centerless Ground services nationally and worldwide
Forte Percision Metals, Inc.
9234 Parklane Ave. Franklin Park, IL 60131
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