E550 marine steel plate is a high toughness marine steel plate. E550 steel plate has the characteristics of high strength, high toughness, fatigue resistance, lamellar tear resistance and good welding function. It is often used in offshore oil and gas drilling, development and related fields equipped with offshore engineering. Manufacturing of supporting equipment. Can choose the classification society certification, for example: DNV/E550, ABS/E550, etc.
E550 steel plate heat treatment:(1) Quenching and tempering.
(2) Flaw detection requirements, flaw detection level requirements, Z-direction function requirements, additional special alloy element requirements, classification society certification requirements, etc. may also be added as required.
Production process of E550 marine steel plate:The E550 steel plate is delivered in the case of quenching + tempering. The quenching temperature is 920°C and the tempering temperature is 630°C.
In order to satisfy the functional requirements of the steel used in the marine route, control measures such as low P, low S, and low inclusions are selected in terms of exercise quality. In order to ensure the purity of the steel, reduce the number of inclusions in the steel, and improve the shape of the inclusions, the steel-making process uses LF+RH and Ca feeding treatment. The detailed process flow is: KR (hot metal pretreatment)-converter exercise-the essence of the furnace (LF + RH + feeding Ca wire)-continuous casting machine-slab heating-double rack rolling-ACC cooling- Quenching-tempering-inspection.
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