Steel Spur Gear

Material for M3 spur gear: 

Medium carbon steel shall be selected for general M3 spur gears with light load, low or medium speed, small impact force and low precision.For example, it is made of Q235, Q275, 40, 45, 50, 50Mn and other steels. It is usually made into soft tooth surface gear by heat treatment such as normalizing or quenching and tempering, and the normalizing hardness hbs160 ~ 200; General quenching and tempering hardness hbs200 ~ 280. Due to the moderate hardness, the fine cutting tooth profile can be carried out after heat treatment, with simple process and low cost. If the hardness of the tooth surface is not high, it is easy to run in, but the bearing capacity is not high. This kind of gear is mainly used for standard series reduction gearbox gears, metallurgical machinery, medium load machinery and some secondary gears in machine tools.  

Medium carbon steel or alloy quenched and tempered steel shall be selected for gears with medium load, medium speed, bearing certain impact load and relatively stable movement. For example, 45, 50Mn, 40Cr, 42SiMn and other steels, 55tid, 60tid and other low hardenability steels can also be used. The final heat treatment adopts high-frequency or medium frequency quenching and low-temperature tempering to make the hard tooth surface gear, which can reach the tooth surface hardness HRC50 ~ 55, and the gear core maintains the normalized or quenched and tempered state, with good toughness. Due to the small deformation of induction heating surface quenched gear, if the accuracy requirement is not high (such as below grade 7), it is not necessary to grind the gear. Most gears in machine tools are of this type. For case hardened gears, attention should be paid to controlling the depth of the hardened layer and the reasonable distribution of the hardened layer along the tooth profile.

SST machinery make good quality M3 spur gear.

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