Steel I-beam 1.Grade:Q235B,Q345,SS400,A36,etc. 2. ... bellows,Standard AISI,ASTM,GB,etcGrade201, 304, 316, 321, 316LDescriptionStianless steel I-beam, I-stee l ,H-steelSurfaceBright, polished ,peeled, cold ... drawn, hot rolledLength6 meter or as your requirementHight10-40mmWaist high100-400mmWidth12-200mmThickness4 ...