Abstract: Disclosed is a high strength, high-temperature corrosion resistant martensitic stainless steel characterized by comprising the following chemical elements in percentages by mass: 0<C?0.05%, 0.1-0.2% of Si, 0.20-1.0% of Mn, 11.0-14.0% of Cr, 4.0-6.0% of Ni, 1.5-2.5% of Mo, 0.001%-0.10% of N, 0.03-0.2% of V, 0.01-0.1% of Nb, 0.01-0.04% of Al, and the balance being Fe and inevitable impurities. In addition, also disclosed are tubing and casing manufactured from the above-mentioned high strength, high-temperature corrosion resistant martensitic stainless steel, and a method for manufacturing the tubing and the casing. The high strength, high-temperature corrosion resistant martensitic stainless steel of the present disclosure has an excellent high temperature corrosion resistance to carbon dioxide and chloride ions, as well as excellent low-temperature impact toughness and a high-temperature strength degradation resistance.

Abstract: The invention provides a seamless line pipe with excellent resistance against corrosion by CO2—H2S-SRB. The line pipe comprises, by mass fraction, C: 0.03 to 0.10%, Si: 0.1 to 0.5%, Mn: 0.10% to 1.50%, P: 0.02% or less, S: 0.005% or less, Cr: 1.0 to 4.0%, Ni: 0.1 to 1.5%, Cu: 0.15 to 2.0%, Mo: 0.05 to 0.4%, Ti: 0.01 to 0.05%, RE: 0.05 to 0.1%, and balance of Fe. After smelting, rolling into a billet, and piercing and rolling into a pipe, the resultant steel pipe is heated to 920 to 1000° C. and kept for 0.3 to 1 hour depending on the thickness of the steel pipe wall, and then subjected to rapid cooling and tempering heat treatment. The seamless line pipe can be used in the field of oil and gas fluid transportation and the like.