heating production line process for square steel billets

Detailed explanation of the heating production line process for square steel  billets

The core of the Billet induction heating machine is to prepare for subsequent hot rolling, forging, or quenching heat treatment. The complete production process is as follows:

Core Process

The square steel billet is smoothly fed into the roller conveyor through the feeding mechanism, and passes through the stepper heating furnace/induction heating square furnace at a constant speed. Using electromagnetic induction eddy current effect or gas combustion, it is quickly and uniformly heated to the austenitization range of 1050-1280 ℃. The infrared temperature measurement system is used for real-time closed-loop temperature control to ensure uniform internal and external heat transfer and no oxidation or decarburization. After heating, the square steel is subjected to high-pressure descaling to remove oxide scale, and then sent to the rolling or quenching station of the rolling mill. The entire process is automated and continuously produced, with precise temperature control, energy saving and environmental protection, providing stable and qualified billets for subsequent processing.

Core Structure and Principle of Production Line

1. Composition of core equipment

-Conveyor system: Long distance roller conveyor+stepper mechanism in the picture, responsible for uniform feeding of square steel to ensure even heating

-Heating furnace body: two types: stepwise gas heating furnace (traditional hot rolling) and medium frequency induction heating machine (modern high-efficiency heat treatment)

-Temperature control system: infrared thermometer+power closed-loop control, precise control of heating temperature

-Auxiliary equipment: descaling machine, overhead crane (bridge crane above in the picture), operating room (control room on the right)

2. Comparison of two mainstream heating methods

Heating method principle, applicable scenarios, advantages

Step by step gas furnace for gas combustion radiation heating of large-sized square steel billets, with high heating capacity and low cost before hot rolling

Intermediate frequency induction furnace electromagnetic induction eddy current heating for small and medium-sized square steel quenching/forging, fast heating before quenching/forging, accurate temperature control, energy-saving and environmentally friendly

Key process points

1. Temperature control: Heating before hot rolling should reach 1050-1280 ℃ to ensure complete austenitization; Quenching heating should be precisely controlled at 850-950 ℃ to avoid overheating and overburning

2. Uniformity guarantee: By using roller conveyor rotating feed and multi zone heating design, the problem of temperature difference between the corners and core of square steel is solved

3. Oxidation control: Using a protective atmosphere or rapid heating to reduce the formation of oxide scale and improve the surface quality of the product