How to Raise tempering temperature patent retrieval - Eureka

High-performance hydrogen sulfide corrosion resistant oil drill rocker and its heat treatment process

InactiveCN101117683AGuaranteed hardenabilityGuaranteed sulfur resistanceDrilling rodsFurnace typesMechanical propertyPetroleum

The present invention relates to a high-performance hydrogen sulfide corrosion resistant petroleum drill pipe with a weight percentage of components as follows: C 0.20-0.32 percent, Si 0.1-0.5 percent, Mn 1.0-1.5 percent, Cr 0.5-1.5 percent, Mo 0.8-1.2 percent, P less than or equal to 0.015 percent, S less than or equal to 0.01 percent and the remainders are Fe and unavoidable impurities. The drill pipe of the present invention has a higher content of Mn, which can guarantee an upset end with a thickness of over 30mms to be fully hardened, thereby guaranteeing the sulfur-resistant performance of the upset end. The drill pipe of the present invention has a higher content of Mo, which can improve the backfire-preventive stability of the material, thereby raising the backfire temperature, reducing the residual stress and guaranteeing the sulfur-resistant performance. Simultaneously, the invention can make the pipe body with a different wall thickness and the upset end have the same cooling speed by controlling the outer water injection of the upset end and pipe body of the steel pipe, reducing the water injection outside the pipe body or increasing the water injection outside the upset end of the drill pipe, to ensure that the pipe body and the upset end have the same quenching structure, and the same mechanical property can be achieved after the backfire.

Owner:BAOSHAN IRON & STEEL CO LTD

110Ksi grade CO2 H2S rust-proof oil well-pipe and manufacturing method

ActiveCN101082112AAccelerated corrosionHigh strengthTemperature control deviceHeat treatment process controlTemperingPipe

The 110ksi grade steel resisting CO2 and H2S corrosion for oil well pipe has the components including C 0.20-0.35 wt%, Si 0.10-1.0 wt%, Mn 0.10-1.0 wt%, Cr 1.0-2.5 wt%, Mo 0.1-1.0 wt%, Ni 0.10-1.0 wt%, Nb 0.01-0.1 wt%, Cu 0.10-1.0 wt%, Al 0.01-0.10 wt%, and Fe and inevitable impurities for the rest. It is produced through smelting, casting, cogging, rolling pipe, water or oil quenching at temperature over 850 deg.c, and high temperature tempering at temperature over 650 deg.c for over 2 hr. It has high CO2 and H2S corrosion resistance.

Owner:BAOSHAN IRON & STEEL CO LTD

High-strength high-toughness petroleum drill pipe and production method thereof

InactiveCN103789685AImprove toughnessHigh strengthDrilling rodsDrilling casingsRoom temperatureHigh intensity

The invention relates to a high-strength high-toughness petroleum drill pipe and a production method thereof. The steel composition of the petroleum drill pipe comprises the following components in percentage by mass: 0.22-0.35% of C, 0.17-0.30% of Si, 0.45-0.65% of Mn, 0.9-1.5% of Cr, 0.9-1.5% of Mo, 0.05-0.15% of V, 0.02-0.04% of Al, 0.05-0.20% of Ni, 0.01-0.06% of Ti, 0.001-0.008% of B, less than 0.005% of S, less than 0.008% of P and the balance of Fe. The manufacturing method of the petroleum drill pipe comprises the following steps: decarbonizing and refining the liquid steel containing the components to form steel billets and hot rolling into seamless steel tubes through a mandrel mill, wherein after being rolled into the seamless steel tubes, the steel tubes are needed to be subjected to the heat treatment processes of two-time quenching and high-temperature tempering so as to guarantee the strength and the toughness of the steel tubes. The petroleum drill pipe manufactured by adopting the method has a remarkable characteristic that a certain amount of austenite tough phases are dispersively distributed on a superfine lath martensite matrix so as to increase the strength and toughness of steel. The high-strength high-toughness drill pipe disclosed by the invention has the advantages that the yield strength can be up to 150-165KSI under the pressure of 1034-1138MPA and the room temperature longitudinal full-size impact toughness is greater than or equal to 100J.

Owner:SHANGHAI HILONG DRILL PIPE MATERIALS INST +1

Corrosion resistant and squeezing resistant casing pipe

InactiveCN101984124ARaise tempering temperatureImprove low temperature impact toughnessDrilling rodsFurnace typesAlloy elementCorrosion resistant

The invention discloses a corrosion resistant and squeezing resistant casing pipe which comprises the following components by weight percent: 0.15-0.25% of carbon, 0.15-0.3% of silicon, 0.50-1.0% of manganese, 2.80-3.20% of chromium, 0.01-0.05% of nickel, 0.15-0.35% of molybdenum, 0.01-0.05% of vanadium, 0.01% of aluminum and the balance ferrum. In the invention, a small amount of nickel, molybdenum and vanadium alloy elements are added on the basis of 2Cr3Mo oil casing pipe alloy, so that an oil well pipe with the strength grade reaching 80KSI / 95KSI steel grade is obtained, furthermore, due to the compound addition of the nickel, molybdenum and vanadium, the temper temperature of the steel is improved, and the lower temperature impact toughness of the steel is obviously improved; in addition, in the invention, content of the carbon is controlled, and the elements such as chromium, nickel, molybdenum and vanadium are added and are subject to suitable heat treatment, so that the casing pipe which can resist the corrosion of CO2 and chloridion at 120-150DEG C and resist H2S and squeezing is obtained. Compared with the series oil casting pipe materials such as low carbon, nickel and molybdenum, the casting pipe has the advantages that nickel can be saved by 2-3%, molybdenum can be saved by 1-2% and a certain amount of copper can be saved, thus the cost of the alloy is greatly reduced. The casing pipe can be widely used for occasions capable of CO2 resistance, H2S resistance and squeezing resistance at the same time, such as oil well pipes and the like.

Owner:WUXI SEAMLESS OIL PIPE

Thermal treatment process of low-alloy steel casting

InactiveCN103290182ARaise tempering temperatureImprove toughnessTemperingThermal treatment

The invention relates to a thermal treatment process of a casting, and in particular relates to a thermal treatment process of a low-alloy steel casting. The thermal treatment process comprises the following steps of: normalizing, water quenching, and high-temperature tempering air cooling. By adopting the thermal treatment process of the low-alloy steel casting, the tempering temperature of the low-alloy steel casting is improved, a direct furnace tapping air cooling mode is adopted, the treated low-alloy steel casting can meet requirements on strength and hardness, and the toughness of the casting is improved at the same time; and in the thermal treatment process of the low-alloy steel casting, a water cooling mode is used in a quenching step, so that the production cost is reduced, the environmental pollution is reduced, and potential safety hazards are reduced.

33results about How to "Raise tempering temperature" patented technology

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