阿富汗采购需求：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

I'm looking for information on long structure beams and square beams for an upcoming project. Please provide details on your available options, including dimensions, weight capacities, and any relevant specifications. Additionally, I'd appreciate a quote for bulk orders and any lead times I should be aware of. If you have any recommendations based on industry standards or typical applications, that would be great. Looking forward to your prompt response!