1. 20 steel thick-walled steel pipe: outer diameter is 219 mm, wall thickness is 9 mm. This kind of steel pipe is often used in transportation pipelines and various structural parts in the fields of chemical industry, petroleum, electric power, etc.
2. 25 steel thick-walled steel pipe: outer diameter is 219 mm, wall thickness is 10 mm. This kind of steel pipe has high strength and hardness and is often used to manufacture mechanical parts and engineering structures that bear large loads.
3. 30 steel thick-walled steel pipe: outer diameter is 219 mm, wall thickness is 12 mm. This kind of steel pipe has good toughness and fatigue resistance and is suitable for manufacturing mechanical parts and engineering structures that bear complex stress.
4. 35 steel thick-walled steel pipe: outer diameter is 219 mm, wall thickness is 14 mm. This kind of steel pipe has high strength and hardness, and also has a certain degree of toughness. It is often used to manufacture mechanical parts and engineering structures that bear large loads.
5. 40 steel thick-walled steel pipe: outer diameter is 219 mm, wall thickness is 16 mm. This kind of steel pipe has good toughness and fatigue resistance and is suitable for manufacturing mechanical parts and engineering structures that bear complex stress.
6. 45 steel thick-walled steel pipe: outer diameter is 219 mm, wall thickness is 18 mm. This kind of steel pipe has high strength and hardness, and also has a certain degree of toughness. It is often used to manufacture mechanical parts and engineering structures that bear large loads.
7. Q345B seamless pipe: Available in a variety of specifications for outer diameter and wall thickness, this steel pipe has good toughness and impact resistance and is often used to manufacture mechanical parts and engineering structures that bear complex stress.
8. 16Mn seamless pipe: Available in a variety of specifications for outer diameter and wall thickness, this steel pipe has good toughness and fatigue resistance and is suitable for manufacturing mechanical parts and engineering structures that bear complex stress.
