Method of making a weathering grade plate and product therefrom

Details Method of making a weathering grade plate and product therefrom Method of making a weathering grade plate and product therefrom

C - Chemistry, Metallurgy

22

C

C22C 38/28 (2006.01) C21D 8/02 (2006.01) C22C 38/00 (2006.01) C22C 38/14 (2006.01) C22C 38/38 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) C22C 38/48 (2006.01) C22C 38/50 (2006.01) C22C 38/58 (2006.01) C21D 1/84 (2006.01)

Patent

CA 2361714

A method of making a weathering grade steel plate includes the steps of casting, hot rolling, and accelerated cooling using a modified weathering grade alloy composition. The composition employs effective levels of manganese, carbon, niobium, molybdenum, nitrogen, and titanium. After the casting, the slab or ingot is heated and rough rolled to an intermediate gauge plate. The intermediate gauge plate is controlled finish temperature rolled and subjected to accelerated cooling. With the controlled alloy chemistry, rolling and cooling, the final gauge plate exhibits continuous yielding and can be used for applications requiring a 70 KSI minimum yield strengh, a 90- 110 KSI tensile strengh, and a Charpy V-notch toughness greater than 35 ft- lbs. at -10~F in plates up to 4.0" thick.

L'invention concerne un procédé de fabrication d'une plaque en acier résistant aux intempéries, qui consiste à couler, laminer à chaud et à refroidir de manière accélérée, au moyen d'une composition d'alliage modifiée résistant aux intempéries. Ladite composition comprend des taux efficaces de manganèse, carbone, niobium, molybdène, azote et titane. Après le coulage, l'ébauche ou le lingot est chauffé(e) et laminé(e) grossièrement, de sorte qu'une plaque d'écartement intermédiaire soit formée. Ladite plaque est chauffée et laminée à température constante et subit un refroidissement accéléré. Grâce à la chimie d'alliage contrôlée, au laminage et au refroidissement, la plaque de mesure est efficace en continu et peut être utilisée pour des applications dans lesquelles sont requises une limite d'élasticité conventionnelle minimum de 70 KSI, une résistance à la traction de 90-110 KSI, des propriétés de résilience Charpy V supérieures à 35 pieds-livre, à 10 ·F dans des plaques dont l'épaisseur peut atteindre 4,0 ~~.

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