Q refers to yield strength, 550 yield strength value, unit MPA; E quality level is E grade (grades are divided into C, D, E). When the purchaser requires the steel plate to have the performance in the thickness direction, a symbol representing the performance level in the thickness direction (Z direction) shall be added after the grade, for example: Q550DZ15.
Q550E steel plate is a high-strength structural steel plate delivered in a quenched and tempered (quenched + tempered) state. The technical standard of Q550E steel plate is GB/T 16270-2009.
The thickness of Q550E steel plate is less than or equal to 150mm, and the thickness direction properties can be required to be Z15, Z25, Z35, such as: Q550E-Z15, Q550E-Z25, Q550E-Z35, etc.
Q550E steel plate is mainly used to manufacture steel structural parts such as coal mine hydraulic supports, heavy vehicles, construction machinery and wear-resistant structures that require good weldability.
