What materials are GL and MS?
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The drawings indicate 50*50*6 thk MS ANGLE IRON and 150*6mm thk MS FLAT BAR; it is known that these are angle iron and flat bar respectively, but the material type is unknown. MS stands for carbon steel, but nothing more specific is known
MS = Mild Steel = Plain-Carbon Steel refers to ordinary carbon steel, not low-carbon or high-carbon steel; the carbon content ranges from 0.16–0.29%. GL: Glass-Lined Steel means steel with a glass lining. Providing context would help in addressing the issue more effectively.