C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) C22C 38/32 (2006.01)
Patent
CA 2569907
Disclosed is a low alloy steel for oil well pipes which has excellent sulfide stress cracking resistance and is suitable for casing and tubing for oil wells or gas wells. Specifically disclosed is a low alloy steel for oil well pipes containing, in mass%, 0.2-0.35% of C, 0.05-0.5% of Si, 0.05-1.0% of Mn, not more than 0.025% of P, not more than 0.01% of S, 0.005-0.10% of Al, 0.1-1.0% of Cr, 0.5-1.0% of Mo, 0.002-0.05% of Ti, 0.05-0.3% of V, 0.0001-0.005% of B, not more than 0.01% of N, not more than 0.01% of O (oxygen), 0-0.1% of Nb, 0- 0.01% of Ca, 0-0.01% of Mg and 0-0.1% of Zr, and having a half-value breadth (H) and a hydrogen diffusion coefficient (D)(10-6cm2/s) satisfying the following formula (1). 30H + D <= 19.5 (1)
L'invention concerne un acier faiblement allié destiné aux tuyaux pour puits de pétrole possédant une excellente résistance au craquèlement dû à la sulfuration et adapté pour le gainage et le tubing de puits de gaz ou de pétrole. Elle concerne plus particulièrement un acier faiblement allié destiné aux tuyaux pour puits de pétrole contenant, en % de masse, 0,2-0,35 % de C, 0,05-0,5 % de Si, 0,05-1,0 % de Mn, pas plus que 0,025 % de P, pas plus que 0,01 % de S, 0,005-0,10 % de Al, 0,1-1,0 % de Cr, 0,5-1,0 % de Mo, 0,002-0,05 % de Ti, 0,05-0,3 % de V, 0,0001-0,005 % de B, pas plus que 0,01 % de N, pas plus que 0,01 % de O (oxygène), 0-0,1 % de Nb, 0-0,01 % de Ca, 0-0,01 % de Mg et 0-0,1 % de Zr, et possédant une largeur de demi-valeur (H) et un coefficient de diffusion d'hydrogène (D)(10-6cm2/s) qui satisfont à la formule suivante (1). 30H + D = 19.5 (1)
Kobayashi Kenji
Omura Tomohiko
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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