BACKSeamless steel pipe
Seamless steel pipe production technology
Description:Hot rolling (extrusion) process
Tube preparation and heating: The solid round steel billet (tube billet) is prepared and inspected to ensure that its quality meets the requirements. Then, the tube blank is heated to a certain temperature so that it becomes soft and easy to shape.
Perforation: The heated tube blank is fed into the perforator for perforation, forming a hollow thick wall capillary. During the perforation process, the tube blank will constantly rotate and advance to ensure that the resulting capillary wall is smooth.
Rolling: The perforated tube is rolled by hot rolling mill, and the wall thickness is gradually reduced through multiple rolling to form a rough tube close to the finished size. In the process of hot rolling, it is necessary to strictly control the heating temperature, rolling speed and other parameters to prevent the deterioration of material properties or crack.
Sizing (reducing) : According to the need, the rolled pipe after the sizing or reducing treatment, in order to achieve the required dimensional accuracy.
Heat treatment: Heat treatment of steel pipes to eliminate residual stress, improve organizational structure, improve mechanical properties.
Finishing and inspection: After heat treatment, the steel pipe is cut, deburring, straightening and other finishing treatment. Finally, through ultrasonic testing, eddy current testing, hardness testing and other means to carry out a comprehensive quality inspection of seamless steel pipe to ensure that the product meets the standard.
parameters
Because of its high strength, corrosion resistance and long life, seamless steel pipes are widely used in many fields:
Mechanical manufacturing: Used to manufacture bearing tube, drive shaft and other mechanical parts.
Geological drilling: as drill pipe, drill collar, core pipe and other drilling tools.
Shipbuilding: Used in the manufacture of pressure piping, boilers and superheaters for ships.
Boiler manufacturing: manufacturing boiler superheated steam pipe, boiling water pipe and other components.
Automobile manufacturing: Used in the manufacture of automobile axle bushing and drive axle housing axle tube.
Petrochemicals: Pipelines for conveying fluid media such as oil, natural gas, gas, water, and certain solid materials.
In addition, seamless steel pipes are also widely used in fertilizer equipment, hydraulic and pneumatic cylinders, diamond core drilling and other fields.
introduction
Hot rolling process features:
High production speed, suitable for mass production.
The product size range is large, can meet a variety of needs.
The mechanical properties of the material can be improved by recrystallization in the process of hot rolling.
Cold rolling (drawing) process characteristics:
The product has high dimensional accuracy and good surface quality.
Suitable for the production of small diameter thin wall, precision and shaped pipe.
During the process of cold rolling (drawing), work hardening occurs in the material structure, which can improve the strength and hardness of the material.
