... structural steel Q235B and High Frequency Welded Light Gauge H sections 2. Size:70*50-500*250 High frequency welded light gauge H ... Sections for contruction 1.standardGB/T 1591, GB/T700, ASTM, EN, DIN2. Steel gradeST37, A36, ... 7. applicantWidely used in all kinds of architecture and engineering structure, such as the beam, Bridges, transmission tower, lifting ...