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Steel
gears play a vital role in many of the important gear applications. Steel
gears can be of plain carbon type and the alloy type. The carbon steels can
offer the end user the advantage of low cost, easy machining and an ability
to be easily hardened. However a major disadvantage being the power to fight
corrosion. Alloy steels on the other hand covers a wide gamut from typically low-grade
types to very special high grade alloys. They offer high strengths. Stainless steel
gears have solved many of the problems associated with stripping and
cracking.| Case Hardened Gears For making case-hardened gears, four general types of steel are used. They are a) straight-carbon b) nickel (c) chrome-vanadium (d) chrome-nickel steel. In each of these types there can be several modifications. But considering every thing the steels that has chromium area good option. It is worth while to note hear that prior to being carbonized, the carbon content of the steels that are mentioned here should be around 0.20 per cent. It should never exceed 0.25 per cent. This only can avoid brittleness in the gear teeth. The following image is of a Boring machine that is using helical case hardened steel gears. |
![]() (Boring machine that uses helical case hardened steel gears) |
| Tempered Gears Tempered gears in comparison to casehardened gears have uniform carbon content. Also they have an uniform hardness on the entire tooth section. Steels for tempered gears are of three types a) silico-manganese, b) chrome-vanadium c) chrome-nickel steel. It is the nickel steel that is generally used. The range of carbon content for the different types is between 0.40 to 0.60 per cent. The following image shows a pipe bending machine that utilizes tempered steel gears. |
![]() (Pipe Bending machine that uses Tempered Steel gears) |



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Effectively sums up all that is happening in the
world of gears.
·Gear Blank ·Gear Cutting ·Gear Hobbing ·Heat Treatment of Gears |
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