LOW ALLOY STEEL HAVING EXCELLENT RESISTANCE TO GASEOUS CARBON DIOXIDE CORROSION AND HYDROGEN SULFIDE CORROSION AND LOW ALLOY STEEL LINE PIPE

• Main Authors: NOSE KOICHI, ASAHI HITOSHI
• Format: Patent
• Language: English
• Published: 09.10.2002
• Edition: 7
• Subjects: ALLOYS; BLASTING; CHEMISTRY; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

PROBLEM TO BE SOLVED: To provide low alloy steel which has excellent resistance to gaseous carbon dioxide corrosion, and is most suitable for an oil well pipe and a line pipe for producing and transporting gas and petroleum used in the field of energy or for steel for a plant, and to provide a low alloy steel line pipe. SOLUTION: The low alloy steel having excellent resistance to corrosion by gaseous carbon dioxide and hydrogen sulfide has a composition which contains, by mass, <=0.3% C, 2 to 7% Cr, <0.2% Si, 0.02 to 1.5% Mn and 2 to 7% Al and in which the total of the Cr content and the Al content is >=5%, and which further contains, if required, Cu, Ni and Mo, and the balance iron with inevitable impurities. The low alloy steel line pipe uses the low alloy steel.