The hot-rolled seamless steel pipe production line mainly includes a series of equipment and process flow for producing high-quality hot-rolled seamless steel pipes. The following is a detailed introduction about the hot-rolled seamless steel pipe production line:

1.Main equipment

(1) Heating furnace: It is used to heat solid billets to a suitable temperature for piercing and rolling. Heating furnaces usually adopt a stepping-type or rotating type, which can uniformly heat the tube billet and improve production efficiency.

(2) Piercing machine: Piercing machine is one of the key equipment in the production line of hot-rolled seamless steel pipes. It uses conical cross rollers and protective covers to pierce the heated tube billet, and then it will form a pierced tube. During the piercing, the billet continuously rotates and moves forward to ensure piercing quality and efficiency.

(3) Rolling mill: The rolling mill is used to further roll the pierced tube into seamless steel pipes that meet the specifications. The production line for hot-rolled seamless steel pipes usually adopts multi stand 3-high rolling mill, such as the Danieli FQM limited motion mandril continuous steel pipe mill. During the rolling process, the cylindrical mandril moves at a constant controlled speed to ensure uniform wall thickness and diameter of the steel pipe.

(4) Sizing machine: The sizing machine is used to perform final sizing on rolled steel pipes to meet specification requirements. The sizing machine usually adopts a multi stand 3-high sizing unit, which can accurately control the diameter and wall thickness of the steel pipe.

(5) Cooling equipment: Steel pipes need to be cooled after rolling to ensure that their structure and properties meet the requirements. Cooling equipment usually adopts a stepping beam type cooling bed or water cooling device, which can cool steel pipes uniformly and quickly.

2.Process flow

(1) Preparation of pipe billet: Firstly, check the quality of the pipe billet and remove any surface defects. Then cut the billet into the required length. It will be punched in the center at the pierced end.

(2) Heating: Send the prepared tube billet into the heating furnace for heating to reach the appropriate temperature range.

(3) Piercing: The heated tube billet is fed into the piercing machine for piercing. Then, the tube billet will change to pierced billet.

(4) Rolling: The pierced tube is fed into a rolling mill for rolling. Through continuous rolling by a multi stand 3-high rolling mill, the wall thickness and diameter of the steel pipe gradually meet the specification requirements.

(5) Sizing and cooling: The rolled steel pipe is finally sized by a sizing machine and then sent to a cooling equipment for cooling.

(6) Quality inspection: Conduct quality inspection on the cooled steel pipes, including testing of wall thickness, diameter, surface quality, etc., to ensure that the product quality meets the standards.

3.Characteristics of production line

(1) Efficiency: The hot-rolled seamless steel pipe production line adopts advanced equipment and technology, which can achieve efficient production and improve production efficiency.

(2) Flexibility: The production line can produce seamless steel pipes of various specifications and materials that meet the demand of customers.

(3) High level of automation: The production line is equipped with automated control systems and testing equipment, which can achieve automated production and quality testing. It also improves production accuracy and product quality. In summary, the hot-rolled seamless steel pipe production line is a complex and efficient system, including main equipment such as heating furnace, piercing machine, rolling mill, sizing machine, cooling equipment, and a series of process flows. These devices and processes work together to ensure high quality and production efficiency of hot-rolled seamless steel pipes.