12.9 Class Carbon steel High Strength Carburizing surface treatment weld pin.

Description

Welding pin is a kind of high-strength rigid connection fasteners. Welding pins are cylindrical heads for arc stud welding, which is short for Cheese head studs for arc stud welding. The specifications of welding pins are nominal diameter Ф10～Ф25mm. The length is 40～300 mm. Welding pins have the manufacturer's identification mark made by embossing on the top surface of the head, and the welding pins have a wide range of uses.

Carburizing: It is a kind of metal surface treatment.

The carburized steel is mostly low-carbon steel or low-alloy steel. The specific method is to place the workpiece in an active carburizing medium and heat it to a single phase at 900-950 degrees Celsius. In the austenite area, after holding for sufficient time, the activated carbon atoms decomposed in the carburizing medium can penetrate into the surface of the steel part, thereby obtaining high carbon in the surface layer, and the core part still maintains the original composition.

Carburizing refers to the process of infiltrating carbon atoms into the surface layer of steel. It also makes the low-carbon steel workpiece have a high-carbon steel surface layer, and then after quenching and low-temperature tempering, the surface layer of the workpiece has high hardness and wear resistance, while the center part of the workpiece still maintains the toughness and toughness of low-carbon steel. Plasticity.

The material of the carburized workpiece is generally low-carbon steel or low-carbon alloy steel (with a carbon content of less than 0.25%). After carburizing, the chemical composition of the surface of the steel can be close to that of high-carbon steel. After carburizing, the workpiece needs to be quenched to obtain high surface hardness, high wear resistance and fatigue strength, and to maintain the strength and toughness of low carbon steel in the core after quenching, so that the workpiece can withstand impact loads

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