Recently, the Q355B grade 200*26mm ultra-thick angle steel developed specially by HBIS Group Tangsteel Company for a large domestic construction machinery and equipment company was produced successfully for the first time by the medium-sized production line, achieving a breakthrough in the limit of angle steel thickness specifications. All the indicators of the product meet the customer's needs, and the batch of product has been smoothly delivered to the customer's site, which will be applied to the key parts of tower crane base.