Mass fraction of carbon structural steel

Carbon structural steel generally does not undergo heat treatment, but is directly used in the supply state. Usually Q195, Q215, Q235 steel carbon quality fraction is low, good welding performance, plasticity, toughness, a certain strength, often rolled into thin plate, reinforcement, welded steel pipe, etc., used in bridge, building and other structures and the manufacture of ordinary screws, nuts and other parts. Q255 and Q275 steel has a slightly higher carbon mass fraction, higher strength, better plasticity and toughness, can be welded, usually rolled into steel, strip steel and steel plate for structural parts and the manufacture of simple mechanical links, gears, couplings, pins and other parts.