Q690E steel plate grade introduction:
"690": indicates that the steel plate thickness greater than or equal to 16mm minimum yield strength value of 690, unit MPa
"E": indicates the quality of steel plate, E grade steel plate impact of -40 degree C.
Q690E can be called the yield strength of 690Mpa low-temperature resistant high-strength steel.
Q690E steel plate surface quality: Q690E steel plate surface is not allowed to exist cracks, bubbles, scars, folding and doping and other defects, such as the above surface defects, allowed to clean up, clean up the depth from the steel plate from the standard of practice, shall not exceed the thickness of the steel plate half of the thickness tolerance, and should be guaranteed to ensure that the minimum thickness of steel plate, defects clean up the place should be smooth and no edges, the steel plate shall not be delaminated, other defects allowed to exist, the depth from the steel plate practice standards. Depth from the steel plate practice standards, shall not exceed half of the thickness tolerance of the steel plate, and should ensure that the defects at the thickness is not less than the allowable thickness of the steel plate.
Q690E steel steel plate use: Q690E steel is adapted to electric power pylons, all kinds of lifting cranes, heavy vehicles, oil derricks, high-temperature fans, large electric shovels, dump trucks and drilling rigs, hydraulic supports in coal mines, steel structures and so on.
