Abstract: The present invention deals with alloyed steels having yield strength of at least 862 MPa (125 Ksi) and exhibiting outstanding hardness and toughness behavior, especially under stringent conditions which may be subjected to frost-heave and thaw settlement cycles, namely at subzero temperatures. The invention also relates to a seamless pipe comprising said steel and a method of production of said pipe thereof.

Abstract: The invention deals with Steel for seamless pipes comprising the following chemical composition elements in weight percent: 0.04?C? to 0.18, 0.10?Si?0.60, 0.80?Mn?1.90, P?0.020, S?0.01, 0.01?Al?0.06, 0.50?Cu?1.20, 0.10?Cr?0.60, 0.60?Ni?1.20, 0.25?Mo?0.60, B?0.005, V?0.060, Ti?0.050, 0.010?Nb?0.050, 0.10?W?0.50, N?0.012, where the balance is Fe and inevitable impurities. The steel of the invention can be used in offshore applications, line process pipes, structural and mechanical applications, especially where harsh environmental conditions and service temperatures down to ?80° C. occur.

Abstract: The present invention deals with alloyed steels having yield strength of at least 862 MPa (125 Ksi) and exhibiting outstanding hardness and toughness behavior, especially under stringent conditions which may be subjected to frost-heave and thaw settlement cycles, namely at subzero temperatures. The invention also relates to a seamless pipe comprising said steel and a method of production of said pipe thereof.

Abstract: The invention deals with Steel for seamless pipes comprising the following chemical composition elements in weight percent: 0.04?C?to 0.18, 0.10?Si?0.60, 0.80?Mn?1.90, P?0.020, S?0.01, 0.01?Al?0.06, 0.50?Cu?1.20, 0.10?Cr?0.60, 0.60?Ni?1.20, 0.25?Mo?0.60, B?0.005, V?0.060, Ti?0.050, 0.010?Nb?0.050, 0.10?W?0.50, N?0.012, where the balance is Fe and inevitable impurities. The steel of the invention can be used in offshore applications, line process pipes, structural and mechanical applications, especially where harsh environmental conditions and service temperatures down to ?80° C. occur.

Abstract: Provided is martensitic heat-resistant steel for boiler applications with a unique combination of enhanced creep strength and excellent oxidation resistance upon high temperature exposure in steam containing environments contacts (in wt.-%): C: 0.10 to 0.16%, Si: 0.20 to 0.60%, Mn: 0.30 to 0.80%, P?0.020%, S?0.010%, Al?0.020%, Cr: 10.5 to 12.00%, Mo: 0.10 to 0.60%, V: 0.15 to 0.30%, Ni: 0.10 to 0.40%, B: 0.008 to 0.015%, N:0.002 to 0.020%, Co: 1.50 to 3.00%, W: 1.50 to 2.50%, Nb: 0.02 to 0.07%, Ti: 0.001-0.020%, iron and unavoidable impurities. The steel is normalized for about 10 to about 120 minutes at a temperature of 1050-1170° C. and cooled down in air or water to room temperature, and then tempered for at least one hour at a temperature of 750-820° C. The steel has a martensitic microstructure with average ?-ferrite content of less than 5 vol.-%.

Abstract: An alloy steel, includes 0.12 to 0.25 wt. % C, 0.40 wt. % or less Si, 1.20 to 1.80 wt. % Mn, 0.025 wt. % or less P, 0.010 wt. % or less S, 0.01 to 0.06 wt. % Al, 0.20 to 0.50 wt. % Cr, 0.20 to 0.50 wt. % Mo, 0.03 to 0.10 wt. % V, 0.20 wt. % or less Cu, 0.02 wt. % or less N, 0.30 to 1.00 wt. % W, and the balance iron and incidental impurities, for making high-strength, weldable seamless steel tubes for structural application, through a hot rolling process and subsequent quenching and tempering.

Abstract: The invention relates to a process for producing seamless line pipes within the quality grade range X 52 to X 90, with a stable yield strength up to a temperature of use of 200° C., and with an essentially constant stress-strain characteristic, by hot-rolling a pipe blank made from a steel which contains the following alloying elements (% by weight): 1 C 0.06-0.18% Si max. 0.40% Mn 0.80-1.40% P max. 0.025% S max. 0.010% Al 0.010-0.060% Mo max. 0.50% V max. 0.10% Nb max. 0.10% N max. 0.015% W >0.30-1.