... 3. delivery time:3-10days High frequency welded light gauge H Sections for contruction 1.standardGB/T 1591, GB/T700, ... ASTM, EN, DIN2. Steel gradeST37, A36, SS400, ST52, SM490, SM5703. Length6METER, 9 METERS, 12METERS or customized.4 ... all kinds of architecture and engineering structure, such as the beam, Bridges, transmission tower, lifting transportation machinery, the ships, the ...