C-beam belongs to Q345 carbon steel, while Z-beam is a common cold-formed thin-walled steel and also belongs to carbon steel.
Structures made of various cold-formed steel sections. Cold-formed thin-walled section steel is formed by cold-working (cold-bending, cold-pressing or cold-drawing) a steel plate or steel strip with a thickness of 1.5 ~ 6 mm, and the same section has the same thickness, and the top of each corner of the section is an arc. In industrial, civil and agricultural buildings, thin-walled steel can be used to make roof truss, rigid frame, grid, purlin, wall beam, wall column and other structures and components.