Detailed Product Description Square pipesMaterial: Q195, Q215, Q235Specification: 15*25~150*250, 25*25-200*200Production Technology: High frequency welding, Production Quality: Follow the standard of GB/T13793-92GB6728-88 and in accordance with Japan JISG3445G3446 standards We supply all types of steel structure products. We can also produce square steel pipe, rectangular steel tube and specially ...