Multiphase structure of bainite and M/A constituent can be obtained for X80 oil-gas pipeline through a novel heat online partitioning (HOP) technology. The effects of partitioning temperature on the microstructure and mechanical properties of the experimental steels were researched by means of mechanical properties test. microscopic analysis. and X-ray diffraction. https://fitnessgravesyardes.shop/product-category/right-crank-arm/