1, Cold drawn steel pipe can lead to material lattice dislocations and other microscopic defects and surface roughness is increased, and precipitation-induced martensite and carbides. Such as cold austenitic steels exhibit increased magnetic phenomena.
2, Resulting in the material lattice dislocations or phase transition occurs at the surface, it will become localized corrosion pitting and other originating location. This phenomenon occurs tube drawing direct adverse effect on the degree of deformation of 20% rate reduction section.
3, Cold drawn steel after cold working will leave a residual stress in the material, the residual stress on stress corrosion cracking of materials (SCC) is extremely unfavorable. Tube drawing any degree of cold working of the material tube drawing will increase the susceptibility to SCC.
4, The degree of cold have an adverse effect on the high temperature creep rupture strength cold drawn steel tubes. Cold drawn steel pipe is generally higher operating temperatures or rupture life requires higher amounts of cold work permit also lower.
Post time: Nov-16-2020