Treatment method of ERW Casing quenched and tempered

Quenched and tempered: erw casing quenched after the high temperature tempering known as quenching and tempering treatment. High temperature tempering refers to tempering between 500-650 ° C. Quenching and tempering can make the performance of erw casing, material to a large degree of adjustment, its strength, plasticity and toughness are better, with good comprehensive mechanical properties. After tempering treatment to get tempered sorbite. Tempered sorbite is formed by tempering martensite and is magnified by more than 500 to 600 times under an optical microscope microscope. It is characterized by the distribution of carbides in the ferrite matrix Carbon body) pellets of the composite organization. It is also a tempering organization of martensite, a mixture of ferrite and granular carbides. At this point the performance of erw casing in the ferrite has been basically no carbon supersaturation, carbide is also a stable carbide. At room temperature is a balanced organization.

ERW casing tempering is high temperature tempering, tempering and low temperature tempering three categories.
High temperature tempering: 500 ℃ ~ 650 ℃
Medium temperature tempering: 300 ℃ ~ 450 ℃
Low temperature tempering: 150 ℃ ~ 250 ℃