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

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.

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.

The invention discloses a compound heat treatment technology for wear-resistant gears. The compound heat treatment technology comprises the following steps: A, washing and drying; B, carburizing; C, carrying out shielding gas air-cooling; D, washing and drying; E, heating and exhausting; F, carrying out intensive carburizing; G, diffusing; H, discharging out of a furnace and air-cooling; and I, carrying out rust prevention. The technology is simple, is environment-friendly and pollution-free in the whole process, can effectively improve the hardness, strength and wear resistance of alloy castings, reduces production cost, saves energy, reduces environmental pollution, is high in tempering temperatures, enables the gears to be resistant to high temperatures, deformation and friction and prolongs the service life.

The invention relates to a heat treatment process for castings, in particular to a heat treatment process for low alloy steel castings, comprising the following steps: normalizing, water quenching, high temperature tempering and air cooling. The heat treatment process of the low-alloy steel castings of the present invention improves the tempering temperature of the low-alloy steel castings, and adopts a direct air-cooling method out of the furnace. The treated low-alloy steel castings not only meet the requirements for strength and hardness, but also improve the toughness of the castings; In the heat treatment process of the low-alloy steel casting of the present invention, water cooling is used in the quenching step, which reduces production costs, reduces environmental pollution, and reduces potential safety hazards.

The invention relates to a processing method for grain refinement of a CrNiMoV high pressure steel forging. The processing method is capable of improving comprehensive mechanical properties of the forging and comprises the following steps: step S01, using steel scrap of grade 2 or above grade 2, nickel remnants, steel cuttings, nickel-containing pig iron and spongy iron as electroslag ingots and controlling the content of each element; step S02, carrying out pre-forging heating on the materials selected in the step S01 to a temperature of 1180 to 1210 DEG C and maintaining the temperature for 15 h; step S03, carrying out wide-anvil compaction and temperature-controlled forging on the electroslag ingots heated in the step S02; step S04, carrying out preheat treatment on a forging obtained after forging in the step S03; and step S05, carrying out quenching on the forging having undergone preheat treatment and then carrying out tempering at a temperature of 600 + / - 10 DEG C. According to the processing method provided by the invention, production efficiency is improved and production cost is reduced through control of chemical composition of raw materials and changing of production technology.

The invention provides 110ksi high steel grade and high CO2 corrosion resistance 13Cr steel for an oil casing, the oil casing made of the same and a method for making the oil casing. The component proportion of the steel for the oil casing has the addition of a few nickel, molybdenum and nitrogen alloy elements based on API L80-13Cr oil casing alloy design. The steel for oil casing comprises the following chemical component by weight: 0.15-0.25 percent of C, 0.2-1.0 percent of Si, 0.20-1.0 percent of Mn, 12.0-14.0 percent of Cr, 0.5-1.5 percent of Ni, 0.2-1.0 percent of Mo, 0.03-0.10 percent of N, and the balance being Fe and inevitable impurities. The oil casing with the CO2-chloridion corrosion resistant strength up 110 steel grade at the temperature over 150 DEG C can be obtained after the steel is smelted, rolled and performed with proper heat treatment. Due to low alloy and production cost and good CO2 corrosion resistance, the 110ksi high steel grade and high CO2 corrosion resistance oil casing can be widely used for oil well pipes and other occasions requiring corrosion resistance.

The invention provides a high strength bolt material and a preparation method thereof. An appropriate amount of microalloy elements of Ti and Nb are added on the basis of 42CrMo steel. The microalloyelements and elements of C and N can form carbon nitride particles to refine austenite grains to form a hydrogen trap, so that material strength and toughness are improved and material resistance to delayed fracture is also improved. The elements of Mo and the like improve the drawing temperature and reduces the content of hydrogen invading from the surface of the material, so that increasing of sensitivity of material delayed fracture is effectively prevented. According to the high strength bolt material, the element of Ni is added. On the one hand, the mechanical property of the material isimproved by the element of Ni cooperating with Ti, Nb and the like. On the other hand, the material resistance to delayed fracture is improved by matching of the element Ni and the element Mo. According to the high strength bolt material, the contents of elements of P, S, Mn and the like are reduced; the amount of non-metallic inclusions in steel is greatly reduced and sensitivity of material delayed fracture is reduced.

The invention relates to a cold-rolled aluminum working roll with good grinding performance. The working roll comprises chemical components which include, by weight percent, 0.85-0.95% of C, 0.25-0.45% of Si, 0.25-0.35% of Mn, 2.50-3.50% of Cr, 0.20-0.40% of Mo, smaller than or equal to 0.25% of Ni, smaller than or equal to 0.025% of P, smaller than or equal to 0.025% of S and the balance Fe and inevitable impurities. According to the cold-rolled aluminum working roll with the good grinding performance, the cold-rolled aluminum working roll with the good grinding performance is obtained, the requirements for surface hardness and roll face roughness of the working roll are met at the same time, and it is verified that effects are good after a user uses the cold-rolled aluminum working roll.

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.

The invention discloses a heat treatment device for a round-link chain and an application method thereof. The device comprises a quenching part and a tempering part which are sequentially arranged, wherein first cooling parts are arranged at the quenching part and the tempering part; the quenching part is provided with a quenching temperature regulating box; the tempering part is sequentially provided with an uniform-temperature tempering heating box, at least one tempering temperature regulating box and a differential-temperature tempering heating box; the quenching temperature regulating box is provided with a second cooling part. The device has the characteristics of being high in integration degree and high in working efficiency; after the round-link chain is quenched, an uniform and small low-carbon lath martensite structure can be obtained; the quenching quality is high; the second cooling part and the first cooling parts are correspondingly connected to a cooling source, so that the cooling quality can be improved, and the requirements of each part of the round-link chain on hardness and toughness can be met.

The present invention relates to production technology of oreochromis mossambicus granulated feed, and belongs to the technical field of fish feed. The production technology includes: conducting an initial quenching and high temperature tempering treatment on raw materials of oreochromis mossambicus feed with a first conditioner, continually conducting a material curing guaranteeing treatment on the raw materials for 130-150 seconds with a material curing guaranteeing device, conducting secondary quenching and high temperature tempering treatment on the raw materials with a second conditioner, and finally placing the raw materials into a granulator, thereby obtaining the oreochromis mossambicus granulated feed. The production technology can not only improve the material quenching and high temperature tempering environment, but also reduce the ring die compression ratio of the granulator in the subsequent granulating process, so that the production technology can not only guarantee product uniformity, water resistance and powder containing ratio requirements, but also improve the production efficiency and the palatability of fish feed.

The present invention discloses a high sulfur resistance petroleum drilling rod heat treatment process. The components of the high sulfur resistance petroleum drilling rod comprise: 0.14-0.18 wt% of C, 0.3-0.5 wt% of Si, 0.7-0.9 wt% of Mn, 1.8-2.2 wt% of Cr, 1.4-1.6 wt% of Mo, 0.2-0.40 wt% of V, 0.07-0.09 wt% of Nb, 0.06-0.08 wt% of Ti, 0.01-0.02 wt% of Ca, 0.05-0.15 wt% of Cu, less than or equal to 0.015 wt% of P, less than or equal to 0.01 wt% of S, and the balance of Fe and unavoidable impurities. The heat treatment process comprises: 1) quenching, wherein the heating temperature is 960-980 DEG C, the thermal insulation time is 0.5-1.5 h, and the obtained material is placed in a water tank with a stirrer, and then is subjected to a cryogenic treatment for 30-40 min at a temperature of -80 DEG C; and 2) tempering, wherein the heating temperature is 510-530 DEG C, and the thermal insulation time is 2-4 h.

The invention discloses a compound heat treatment technology for wear-resistant gears. The compound heat treatment technology comprises the following steps: A, washing and drying; B, carburizing; C, carrying out shielding gas air-cooling; D, washing and drying; E, heating and exhausting; F, carrying out intensive carburizing; G, diffusing; H, discharging out of a furnace and air-cooling; and I, carrying out rust prevention. The technology is simple, is environment-friendly and pollution-free in the whole process, can effectively improve the hardness, strength and wear resistance of alloy castings, reduces production cost, saves energy, reduces environmental pollution, is high in tempering temperatures, enables the gears to be resistant to high temperatures, deformation and friction and prolongs the service life.

The invention provides medium and low temperature oil bath tempering equipment. The medium and low temperature oil bath tempering equipment comprises a furnace body, a vacuumizing protective atmosphere system, a hot oil circulation system and a cold oil circulation system. The vacuumizing protective atmosphere system comprises a tee joint gas pipe, a vacuum pump communicating with an inner cavityof the furnace body through the tee joint gas pipe, and a steel cylinder for storing inert gas, and the steel cylinder is connected with the tee joint gas pipe. The hot oil circulation system comprises a hot oil tank, a first hot oil pump, a heater and a hot oil circulation pipeline with the two ends communicating with the furnace body, and the hot oil tank, the first hot oil pump and the heater are sequentially connected with the hot oil circulation pipeline. The cold oil circulation system comprises a second hot oil pump, a cold oil tank and a cold oil circulation pipeline with the two endscommunicating with the furnace body, and the second hot oil pump and the cold oil tank are both connected with the cold oil circulation pipeline. Tempering oil is heated and subjected to heat preservation under a completely sealed condition, and aging caused by oxidation when the tempering oil makes contact with air is eliminated. Meanwhile, oil fumes are eliminated, and the higher tempering temperature is obtained. After tempering is finished, the hot oil circulation pipeline is closed, the cold oil circulation pipeline is opened, cold oil is injected into the furnace body, a workpiece is cooled through the cold oil, and the recycled cold oil flows back to the cold oil tank.