Technical Memo

4330 VANADIUM MODIFIED

We don’t compromise your Gear or Pinon Service Life by selecting the more popular and more economical 1045, 4140, 4130, 4340, or 4350 shelf steels.

HMC  uses 21st Century Advanced Technology Forged and Cast Steels when Large Critical Open Gearing is required.

Our Gear & Pinon Materials offer increased hardness and strength, (Tensile and Yields), and improved wear resistance, without sacrificing any of their abilities to Deform and Absorb Stress. All of this is achievable with our 4330 plus Improved Wear Resistance, even when operating temperatures drop to – 40 Degrees Farenheit.

4330 modified –vs- 4140 and 4340

Chemical and Alloy Composition Range

Charpy impact values

4330 mod             impact values upto 25 ft-lbs at -40 degrees

4340                     impact values upto 12 ft-lbs at 70 degreesF

4140                     impact values upto 15 ft-lbs at 70 degrees F

HMC’s Seamless Forged 4330 Vanadium Modified and 4330 Ladel Injected Modified Cast Steel offer longer lasting Gear Life due to the increased contents of nickel, chromium, molybdenum, and vanadium; alloys and chemicals necessary for Advanced Technology Longer Lasting Gear and Pinion Life.

A Steels ability to deform and absorb stress is referred to as its Impact Ability. The higher the Impact Values the tougher the steel. Higher Impact Values also decrease the probability of cracks as well slowing the rate of a cracks propagation. This is especially important when steel becomes brittle during severe long lasting cold temperatures.

Open Gearing intended for heavy loading requires design by Experience. HMC has 35 Years of that experience. We increase the Cross Section Thicknesses and Radii at every  transition point on our Gears. This is our Trademark, you will find these differences on all HMC Designed Gears.

Our 21st century Designs and Material Selections further enhance our Advanced Technology Replacement Gears. We guarantee with confidence that an HMC Forged Fabricated or Cast Gear; when manufactured to our Design, Specifications, and Material Selection, and Installed and Aligned adequately, can and will offer as good an Advanced Technological Solution as there is available anywhere.

For over 35 years we have demonstrated that ability by proving that our Gears pass the True Test; “THE TEST OF TIME”.

 And that is why our Warranties surpass that of our Competitors!