A seamless steel tube for use as a steel catenary riser in...

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 9/08 (2006.01) C22C 38/18 (2006.01) E21B 17/00 (2006.01) F16L 13/02 (2006.01) F16L 23/024 (2006.01)

Patent

CA 2680943

The invention relates to an SCR with upset ends, consisting of a novel chemical composition having a low carbon content and a microstructure, and to a method for producing said SCR. Said method improves the fatigue life of the SCR by creating a single component with the riser pipe section in the touchdown zone. The SCR with upset ends and a low carbon content obtains its desired properties by means of the heat treatment to which it is subjected. The novel chemical composition having a low carbon content and microstructure comprise, in weight percentage, between 0.04 and 0.10 of carbon, between 0.40 and 0.70 of manganese, between 0.15 and 0.35 of silicon, between 0.40 and 0.70 of chrome, between 0.40 and 0.70 of molybdenum, between 0.10 and 0.40 of nickel, a maxiumum of 0.008 of nitrogen, between 0.010 and 0.045 of aluminium, a maximum of 0.005 of sulphur, a maximum of 0.020 of phosphorus, between 0.003 and 0.020 of titanium, between 0.020 and 0.035 of niobium, no more than 0.10 of vanadium, no more than 0.20 of copper, a maximum of 0.020 of tin, and the equivalent of a maximum of 0.43 of carbon and no more than 0.23 of PCM, with a yield strength of at least 4569.5 kg/cm2, an utimate tensile strength of at least 541 3.1 kg/cm2, and a YS/UTS ratio lower than 0.89 in the material forming the body of the pipe, the transition zone and the upset end.

La présente invention décrit un SCR de refoulement d'une composition chimique à faible teneur en carbone innovante et sa microstructure, ainsi qu'un procédé de fabrication assurant une amélioration de l'endurance en raison de sa nature monobloc avec la section de conduite d'élévation dans la zone de contact. Le SCR de refoulement à faible teneur en carbone atteint ses propriétés souhaitées par le traitement thermique auquel il est soumis. La composition chimique à faible teneur en carbone innovante et sa microstructure comprennent, en pourcentage en poids, entre 0,040 et 10 % de carbone, entre 0,40 et 0,70 % de manganèse, entre 0,15 et 0,35 % de silicium, entre 0,40 et 0,70 % de chrome, entre 0,40 et 0,70 % de molibdène, entre 0,10 et 0,40 % de nickel, 0,008 au maximum d'azote, entre 0,010 et 0,045 % d'aluminium, 0,005 % au maximum de soufre, 0,020 % au maximum de phosphore, entre 0,003 et 0,020 % de titane, entre 0,020 et 0,035 % de niobium, pas plus de 0,10 % de vanadium, 0,20 % au maximum de cuivre, 0,43 % au maximum de carbone et pas plus de 0,23 % de PCM, avec une limite élastique d'au moins 4569,5 kg/cm2, une résistance à l'attraction finale d'au moins 541 3,1 kg/cm2 et un rapport de YS/UTS en dessous de 0,89 dans la matière représentant le corps de la tuyauterie, la zone de transition et l'extrémité de refoulement.

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