Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.

Carbon steel pipes are made by piercing steel ingots or solid round steel into capillary tubes, which are then hot-rolled, cold-rolled or cold-rolled. Carbon steel pipes play an important role in China's steel pipe industry.