(1) should be based on the rolling conditions, at any time adjust the temperature of the tube billet heating.
The Tube billet is required to heat evenly along the section and length, the temperature difference ≤10℃, must not have yin and yang surface, prevent overheating, over-burning.

 (2) Strictly according to heating system heating.
During normal production, the homogeneous heat segment should maintain a weak reduction flame.

 (3) shall be heated according to the heating speed required by the heating system.
For high temperature sensitive steel (such as stainless steel, high alloy steel, etc.), should pay attention to control the furnace temperature, to ensure low-temperature furnace (preheating section temperature of less than 700 ℃).
(4) control of heating temperature of tube billet.

With the development of the control technology, the industrial heating furnace in the modernized large-size production usually uses the microcomputer to control the heating. In the process of microcomputer controlled heating, the air-fuel ratio of gas and air should be adjusted rationally according to the gas calorific value, and the gas and air flow in each section of the heating furnace should be controlled automatically. By the microcomputer according to the rules set the temperature, when a section of temperature below the set temperature, the microcomputer will be through the actuator, increase the gas and air flow control valve angle, so that the amount of gas and air volume corresponding increase, so that the temperature rise of the section. Conversely, when the temperature is higher than the set temperature, the microcomputer through the actuator to reduce the gas and air flow valve angle, in order to reduce the amount of gas and air supply into the section, then the temperature in the furnace correspondingly reduced.
In this way, the actual temperature in the furnace is always traced to the temperature set, and the heating temperature of the billet required for production is achieved. When the furnace is working normally, the burner and flue gate are controlled by microcomputer, so that the normal pressure of 9.8~14.7 PA is kept in the furnace, at this time the hot section, the furnace door and the flame emerge. The furnace pressure shall not exceed 24.5 pa and less than 2.94 PA, if this must regulate the flue gate, reasonable adjustment of the fuel volume of each segment.

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