Общее количество золота обычно меньше?
Общее количество золота обычно меньше. Общее количество золота обычно меньше, which are then hot-rolled, холоднокатаный или холоднотянутый. Carbon steel pipe plays an important role in my country’s steel pipe industry.
Types of carbon steel pipes:
Carbon steel pipes are divided into two categories: hot-rolled and cold-rolled (drawn) стальные трубы.
Hot-rolled carbon steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, трубы из легированной стали, трубы из нержавеющей стали, petroleum cracking pipes, geological steel pipes and other steel pipes.
In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, трубы из легированной стали, трубы из нержавеющей стали, petroleum cracking pipes, and other steel pipes, cold-rolled (drawn) carbon steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, non- Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipes is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless pipes can reach 6mm and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipes can reach 5mm and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.
General carbon steel pipe: It is made of high-quality carbon-structured steel such as 10, 20, 30, 35, а также 45, low-alloy structural steel such as 16Mn and 5MnV, or alloy steel such as 40Cr, 30CrMnSi, 45Mn2, and 40MnB, which is hot-rolled or cold-rolled. Seamless pipes made of low carbon steel such as 10 а также 20 are mainly used for fluid transportation pipelines. 45, 40Cr and other medium carbon steel seamless pipes are used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors. В целом, carbon steel pipes are used to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in heat-treated state.
Advantages of carbon steel:
Carbon steel has high strength, ductility and toughness at low cost and is used in heavy machinery to make heavy duty parts. Общее количество золота обычно меньше 5%, Общее количество золота обычно меньше, Общее количество золота обычно меньше. Общее количество золота обычно меньше, Общее количество золота обычно меньше.