CIC invited client’s inspector to witness the semi-finished machining after heat treatment of M42 girth gear.

In the beginning of Nov 2023, CIC invited client’s inspector to witness the semi-finished machining after heat treatment of M42 girth gear.

Heat treatment includes the normalizing, quenching and tempered. Quenching and high temperature tempering is a comprehensive heat treatment process that combines quenching and high-temperature tempering.

Most quenched and tempered parts work under relatively large dynamic loads, bearing the effects of tension, compression, bending, torsion, or shear. Some surfaces also have friction, requiring certain wear resistance, and so on. In short, the parts work under various composite stresses. These types of parts are mainly structural components of various machines and mechanisms, such as shafts, connecting rods, bolts, gears, etc., and are widely used in manufacturing industries such as machine tools, automobiles, and tractors. Especially for large components in heavy machinery manufacturing, quenching and tempering are more commonly used. Therefore, quenching and tempering treatment plays a very important role in heat treatment.

The performance requirements for quenched and tempered parts in mechanical products are not exactly the same due to their different stress conditions. Generally speaking, various quenched and tempered parts should have excellent comprehensive mechanical properties, that is, a suitable combination of high strength and high toughness, to ensure the long-term smooth operation of the parts.