H-BEAM เหล็กเอฃบีม เหล็กโครงสร้างรูปพรรณรีดร้อนตามมาตรฐาน มอก.1227:2558 TIS STANDARD : 1227-2558 GRADE SS400, SM520.
#STEEL #เหล็กเอฃบีม #BEAM
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