Is the ordinary carbon steel Q235 - General panel is what we often call the A3 round regular fixture for the production of riveting a steel material. Q represents the yield of this material degree, behind the 235, the yield refers to the value of this material, in the 235 or so. As the material thickness will increase its yield value decreases. Because carbon is moderate, better overall performance, strength, ductility and welding, with good performance, the most versatile.