Q690D steel is a high-strength welded structural steel grade. Q—the first letter of the Chinese spelling of “Qu” for the yield strength of steel; 690 represents the yield strength value, the unit is MPa, and D represents the grade of the steel plate; -20 ℃; common steel plate quality grade steel plates are Q690A, Q690B, Q690C, Q690D, Q690E.
When the client needs the
Q690D steel plate to have the performance in the thickness direction, the symbol representing the performance level in the thickness direction (Z direction) is added after the above specified grade, for example: Q690D-Z15. Q690D plates can be called low temperature resistant high strength steel with yield strength of 690Mpa.
Q690D smelting method: the steel is smelted by converter or electric furnace, if necessary, it is refined outside the furnace, and delivered in the condition of quenching and tempering
Q690D executive standard: GB / T1591-2008, GB / T16270-2009
The packaging, marking and quality certificate of 0690D high strength steel plate comply with: GB / T247, GB / T2101.
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