德国采购需求：镀锌钢管、热轧钢管、方钢管、矩形钢管、热轧方钢管、石油天然气管道

We're looking to procure several structural and metal products with specific requirements. For structural channels, we need a type with specified dimensions in carbon steel (grade S355J2) and a length of 12 meters, with a total quantity of 13 pieces. Additionally, we require sheet metal in galvanized steel, off-white color with pre-painted PVC treatment. The thickness is set at 0.5 mm, with dimensions of 1m width and 2m length; a total of 158 sheets is needed. Furthermore, we're interested in square hollow section tubing made from carbon steel (grade S355J2), measuring 100 mm with a wall thickness of 4 mm and 6 m in length, requesting 45 pieces. Also, we seek two types of metallic line pipes: one with a nominal size of 1 inch and schedule XXS, and another with a nominal size of 3 inches and schedule 80, both in carbon steel (API 5L and ASTM A106 Grade B). The quantities required are 3 pieces for the first and 8 pieces for the second, both at specified lengths.