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P235GH steel plate process design and rolling process

The production process of P235GH steel plate is: blast furnace hot metal—hot metal pretreatment—converter smelting—LF furnace refining—slab continuous casting (electromagnetic stirring or light pressing)—billet heating—rolling—straightening and trimming—flaw detection—inspection— storage.

Steelmaking process The reasonable steelmaking and continuous casting process requirements for P235GH steel plate are: hot metal desulfurization pretreatment; alloy and scrap steel clean and dry; converter slag blocking and tapping, slag layer thickness <100 mm;

The LF refining is controlled according to the target composition; the static hydrogen blowing time of the ladle is > 3 minutes before the machine is put on the machine, and the target superheat of the tundish is controlled below 25°C; the whole process of pouring is protected, and electromagnetic stirring or light reduction technology is used.

Rolling process of P235GH steel plate

The rolling-normalizing process is a rolling process in which the final rolling temperature is the normalizing temperature of the P235GH steel plate. The microstructure of the normalized rolled P235GH steel plate is the same as that of the supplemented normalized after rolling, and the mechanical properties of the P235GH steel plate can also meet the standard requirements.