Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Purpose. Experimental study on microstructure, mechanical properties of pipe diversity a new type cold rolling pipe, which has the ability to perform different modes supply and rotation. Methodology. Research method is an experimental one modern industrial equipment using devices. The was conducted when pipes made steel 08Cr18Mn10Ti CRP 6-20 mills. Rolling route often 25 × 2.5 mm ® 16 1.5 mm, used in production. carried out mills four feed rotation: mode 1 – performed before forward stroke, rotation return stroke stand; 2 reverse 3 feeding front rear position stand 4 turn are stand. Findings. Metallographic studies microstructures showed that for 1, grain size outer surface less than inner surface. difference reaches value 1–2 points. For 4, opposite true. grains larger This can be explained by fact most compression rather stroke. And these crimps close smaller 2. Originality. New data have been obtained first time state-of-the-art mill small-diameter riveted cross-sectional longitudinal sections surfaces between them possible turning modes. time, values strength limit, yield ultimate elongation at as well. Practical value. from set quality parameters metal properties, transverse differences packages allow choose production cold-formed ensure compliance with regulated pipes.