2023-12-25
National standard seamless steel pipes are made from steel ingots or solid tube blanks that are perforated into capillary tubes, and then hot rolled, cold rolled or cold drawn. National standard steel pipes play an important role in the domestic steel pipe industry. According to incomplete statistics, there are more than 240 national standard steel pipe manufacturers in the country, more than 250 sets of seamless steel pipe units, and an annual production capacity of about 4.5 million tons.
