Low Carbon Steel Pipe Manufacturer Aging Tendency

Low Carbon Steel Pipe Manufacturer Aging Tendency

Low carbon steel pipe has a large aging tendency, which means low carbon steel pipe has both quenching aging tendency and deformation aging tendencies. When the steel from the rapid cooling of high temperature, ferrite scraping carbon, nitrogen supersaturation, the formation of iron carbon nitrogen started slowly at room temperature. Which leads to the increase of strength and hardness, and the decrease of plasticity and toughness. This penomenon known as quenching aging. Low carbon steel pipe will produce aging even if not quenched and air cooled.

Carbon steel pipe and nitrogen atoms interact with dislocations, and carbon and nitrogen atoms gather around the dislocation lines. This combination of carbon and nitrogen atoms and dislocation lines is called the Koch's air mass. It will increase the strength and hardness of steel and plasticity and toughness reduced, a phenomenon known as deformation aging.

Compared with quenching, deformation of low carbon steel pipe has a greater harm on plasticity and toughness. From the upper yield point occurs until the extension of the end of the yield, the surface of the sample due to uneven deformation of the surface formed by the surface wrinkles, known as the Ryders zone. Many stamping parts are often scrapped.

There are two ways to prevent it. A high pre-deformation method, pre-deformation of the steel placed for a period of time after the stamping will produce Rüders belt, so the pre-deformation of the steel before the stamping time should not be placed too long. The other is the addition of aluminum or titanium steel to form a stable compound with nitrogen, to prevent the formation of Kel's air-induced deformation of the aging.