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3084 results about "Cooling speed" patented technology

Marine engineering large thick steel plate submerged arc welding process method in low-temperature environment

The invention belongs to the field of welding, in particular to a process method applicable to marine engineering large thick steel plate submerged arc welding in low-temperature environment, which comprises a welding method, welding material selection, a welding order, a welding process and the selection and control of various welding process parameters. The method renders with carbon dioxide gas protection welding, and fills and faces through an automatic submerged arc welding; stops welding when the welding reaches more than two thirds of the thickness of a large groove during the welding process, clears chips on the back side and completes the welding of the other side; finally completes the welding of the first side; strictly controls all relevant process parameters of the welding during the welding process, and solves the problems of poorer anti-crack toughness of welding seams and heat affected zones caused by too high cooling speed of the welding seams and too high temperature; can ensure good anti-crack toughness of a welding seam connector without heat treatment after welding; and can meet the requirements of welding of an E36 plate with the thickness of 35 to 77mm under the working environment at the temperature of above -30DEG C, simplifies the production process, shortens the production cycle and reduces the cost.
Owner:PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD

High-strength cold rolling transformation induced plasticity steel plate and preparation method thereof

The invention provides a high-strength cold rolling transformation induced plasticity steel plate and a preparation method thereof. The high-strength cold rolling transformation induced plasticity steel plate comprises the following components by weight percentage: 0.1%-0.5% of C, 0.1%-0.6% of Si, 0.5%-2.5% of Mn, 0.02%-0.12% of P, less than or equal to 0.02% of S, 0.02%-0.5% of Al, less than or equal to 0.01% of N, 0.1%-1.0% of Cu and the rest Fe. The preparation method comprises the following steps of: (a) refining molten steel meeting a component condition, and casting into a blank; (b) rolling, wherein the heating temperature is 1,100-1,250 DEG C, the heat preservation time is 1-4h, the initial rolling temperature is 1,100 DEG C, the final rolling temperature is 750-900 DEG C, the coiling temperature is less than 700 DEG C, the thickness of a hot rolled steel plate is 2-4mm, and the cold rolling accumulated pressing amount is 40-80%; and (c) continuous annealing, wherein the annealing temperature is 700-Ac3+50 DEG C, the heat preservation time is 30-360s, the cooling speed is 10-150 DEG C/s, the aging temperature is 250-600 DEG C, the aging time is 30-1,200s, and the hot roller steel plate is cooled at the speed of 5-100DEG C/s to be at the room temperature. The steel plate disclosed by the invention has the bending strength of 380-1,000 MPa, tensile strength of 680-1,280 MPa and elongation of 15-30%.
Owner:ANGANG STEEL CO LTD

Steel plate for stamping and quenching and manufacturing method thereof

The invention discloses a steel plate for stamping and quenching and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.28 percent of C, less than 0.40 percent of Si, 0.4 to 2.0 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.016 to 0.040 percent of Al, 0.15 to 0.8 percent of Cr, 0.015 to 0.12 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of N, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps of: heating a blank to 1,150 to 1,250 DEG C, preserving heat for 2.5 to 4 hours and performing rough rolling, and then performing finish rolling under multichannel pressure and at the final rolling temperature of between 830 and 950 DEG C, performing laminar cooling, and cooling to the rolling temperature at the cooling speed of more than 10 DEG C/s and the rolling temperature of between 600 and 680 DEG C. The cold-rolled steel plate is obtained by the following steps of: performing cold rolling on a hot rolled steel strip, annealing through a pure hydrogen gas cover furnace, and oiling and packaging. The annealing temperature is 550 to 650 DEG C and the heat preserving time is 3 to 5 hours. The steel has a simple component design and high hardenability. The depth of a hardening layer of more than HRC45 is 10 to 16mm. The steel plate consists of ferrite and pearlite. After thermal stamping and quenching, an all-martensite structure can be obtained. The tensile strength is above 1,300N/mm<2>.
Owner:ANGANG STEEL CO LTD

X80 level large-deformation resistance pipe line steel medium and heavy plate production method

The invention relates to a method for producing an X80 grade large deformation resistant pipeline steel medium plate. The economic component design with low carbon is adopted to perform controlling and rolling stages on ingot, namely rolling the grain refined zone and the non grain refined zone. The method comprises: firstly, air cooling and relaxing after finished rolling is performed so that the temperature of a steel plate before entering water and cooled is reduced below the phase change point Ar3 between 30 and 50 DEG C, and 50 to 70 percent of austenite in the relaxing process is converted into proeutectoid ferrite; and secondly, laminar flow cooling is performed on the steel plate within the range of the cooling speed between 20 and 35 DEG C per second, the finished cooling temperature is controlled within the range of between 250 and 400 DEG C; and in the water cooling process, the remaining austenite is converted into bainite structure, and proeutectoid ferrite + bainite double-phase structure is obtained. The intensity and the plasticity index of the finished product satisfy the following requirements: the yield strength Rt0.5 is 530 to 630MPa, the intensity of tension Rm is 625 to 825 MPa, the yield ratio Rt0.5/Rm is less than or equal to 0.80, and the homogeneous deformation tensile stretch UEL is more than or equal to 10 percent.
Owner:UNIV OF SCI & TECH BEIJING

Frequency converting control method for refrigerator

The invention provides a frequency converting control method for a refrigerator. The method includes that (1) whether the refrigerator meets a refrigeration condition or not is determined after defrosting of the refrigerator is finished; (2) if the refrigerator meets the refrigeration condition, an environment temperature and a setting temperature are detected, and a preset revolution meter is inquired so as to control the operation of a compressor at a corresponding maximum revolution speed until the refrigeration is completed; (3) when the refrigerator meets the refrigeration condition again, the operation of the compressor is controlled at a corresponding minimum revolution speed; (4) whether the compartment temperature of the refrigerator decreases to a preset temperature or not after preset time is determined; (5) if the compartment temperature of the refrigerator does not decrease to the preset temperature, the revolving speed of the compressor is increased by one level, and the step (4) is returned; and (6) if the compartment temperature of the refrigerator decreases to the preset temperature, the compressor is controlled to continue operating until the refrigeration is finished. According to the frequency converting control method for the refrigerator, the revolving speed of the compressor is continuously adjusted according to the environment temperature, interior temperatures of compartments and the like, so that the frequency conversion is achieved, the cooling speed of the refrigerator is improved, waste of cooling capacity of the compressor is reduced, and the energy consumption is lowered.
Owner:HEFEI MIDEA REFRIGERATOR CO LTD

High strength non-quenched and tempered free machining steel for automobile connecting bar and technological process thereof

The invention discloses a high-intensity non-quenching and tempering easy-cutting steel used for a vehicle connection rod and a technical method thereof. The invention starts from the principle of improving the intensity of the non-quenching and tempering easy-cutting steel and leads the anti-tension intensity of the non-quenching and tempering easy-cutting steel containing 0.30 to 0.40 percent of carbon to be 1000MPa and the yield strength to be 750MPa by adjusting the components. The technical scheme of the invention is: the high-intensity non-quenching and tempering easy-cutting steel used for a vehicle connection rod consists of the elements of C, Si, Mn, Al, P, S, Cr, V, N and Fe; the weight percentages of the component elements are: 0.30 to 0.4 percent of C, 0. 50 to 0.70 percent of Si, 0.80 to 1.20 percent of Mn, equal to or less than 0.040 percent of P, 0.030 to 0.060 percent of S, 0.010 to 0.040 percent of Al, 0.10 to 0.40 percent of Cr, 0.10 to 0.30 percent of V, 010 to 0.015 percent of N and the rest is Fe and unavoidable impurities. The heating temperature of a continuous casting blank is 1200 DEG C; the heating time is 160min; the start rolling temperature is 1100 DEG C; the final rolling temperature is 900 DEG C; the pressing volume is 16; the cooling speed after rolling is 40 DEG C/min; after bundling, the components are thrown in a pit and slowly cooled.
Owner:WUHAN IRON & STEEL (GROUP) CORP

Ti microalloyed ultra-fine grained cold rolling dual-phase steel of 1,000MPa level and preparation method thereof

The invention relates to Ti microalloyed ultra-fine grained cold rolling dual-phase steel of a 1,000MPa level and a preparation method thereof, belonging to the technical field of cold rolling ultra-high strength steel for automobiles. The steel comprises the following chemical compositions in percentage by weight: 0.03-0.20 percent of C, 0.20-0.80 percent of Si, 1.2-2.0 percent of Mn, 0.03-0.15 percent of Ti, less than 0.15 percent of S, less than 0.020 percent of P, 0.02-0.15 percent of Als and the balance of Fe. In the invention, C-Si-Mn-Ti is used as a basic alloy system, low-price Ti is adopted, and alloy elements such as Cr, Mo, Nb, V, and the like are not added, thereby reducing the production cost; through a flexible continuous annealing process, the size of a martensite island can be controlled to be 1-2 micrometers or increased to about 5 micrometers under the condition that the quick cooling speed is lower than 50 DEG C/s in continuous annealing so as to obtain the following three different types of dual-phase steel: a high strength type (Rm is 980-1,200MPa, and A50 is 10-13 percent), a high plasticity type (Rm is 980-1,100MPa, and A50 is 14-18 percent) and a synthesizing type (Rm is 980-1,150MPa, and A50 is 12-15 percent); and the yield ratio is 0.47-0.65.
Owner:UNIV OF SCI & TECH BEIJING

Manufacturing method of HB500 grade low-manganese wear-resistant steel plate

The invention discloses a manufacturing method of a HB500 grade low-manganese wear-resistant steel plate. The manufacturing method comprises the specific steps as follows: continuous casting billets meeting the requirements are selected; the rolling process is conducted: the heating temperature is 1100 to 1200 DEG C, the rolling is conducted at a crystallization region and an austenite non-recrystallization region by adopting austenite, the final rolling temperature is 1000 to 1050 DEG C, and the billets are roughly rolled into intermediate billets of 1.7 to 2.0 times the thickness; the finish rolling starting temperature is 850 to 920 DEG C, a laminar cooling manner is adopted, the final cooling temperature is 600 to 700 DEG C, and the cooling rate is 10 to 20 DEG C/S; the quenching process is conducted: the steel plate heating temperature is 860 to 940 DEG C, the heat preservation time is 10 to 30min, and the billets are cooled to a normal temperature at a cooling speed of 40 DEG C/S; and the tempering process is conducted: the quenching steel plate heating temperature is 150 to 300 DEG C, the billets are loaded to a cooling bed to be air-cooled after the heat of the billets is preserved for 1 to 3 hours, and then the HB500 grade low-manganese wear-resistant steel plate is obtained. The HB500 grade low-manganese wear-resistant steel plate has the advantages of high hardness, high strength and high toughness, and is suitable for being used in bulldozers, loaders, excavators, dump trucks and various mining machines.
Owner:NANJING IRON & STEEL CO LTD +1

Grade X80 pipe line steel with low yield ratio and manufacturing method thereof

The invention provides grade X80 pipe line steel with low yield ratio and a manufacturing method thereof, belonging to the technical field of metallurgy; the pipe line steel consists of the following components by weight percent: 0.02-0.06% of C, 0.22-0.29% of Si, 1.6-1.9% of Mn, no greater than 0.002% of S, no greater than 0.012% of P, no greater than 0.045% of Al, 0.15-0.25% of Cu, 0.08-0.26% of Cr, 0.2-0.3% of Ni, 0.07-0.11% of Nb, 0.03-0.057% of V, 0.012-0.022% of Ti, 0.22-0.32% of Mo, no greater than 0.0043% of N, no greater than 0.0018% of Ca and the balance Fe. The manufacturing method comprises the following steps: melting and casting to obtain casting blank; heating and preserving warm; rolling the casting blank in two stages, wherein the start rolling temperature of the first stage of rolling is at 1100-1150 DEG C, the start rolling temperature of the second stage of rolling is at 920-940 DEG C, and the total rolling amount of the second stage is 68.4-72%; and after rolling, quickly cooling the casting blank, cooling the casting blank in the air, and cooling the casting blank to 340-490 DEG C at the cooling speed of 5-30 DEG C/s. The product of this invention has comparatively high strength as well as comparatively low yield ratio, namely excellent large-deformation resistance, can be used for normal transportation and supply of oil gas in earthquake-prone zones and constantly frozen zones, and has wide development prospect.
Owner:NORTHEASTERN UNIV

Ultra quick quenching oil and preparation method thereof

InactiveCN102212662AFast coolingFast medium temperature cooling speedQuenching agentsPolybutyleneAntioxidant
The invention relates to ultra quick quenching oil and a preparation method thereof. The ultra quick quenching oil comprises the following raw materials in percentage by weight: 80 to 97 percent of refined mineral oil, 1 to 10 percent of cooling catalyst, 1 to 5 percent of antioxidant and 1 to 6 percent of anionic surfactant. The kinematic viscosity of the refined mineral oil at the temperature of 40 DEG C is 6 to 9 mm<2>/s; the cooling catalyst is a mixture of oily phenolic resin and polybutylene; the antioxidant is alkylated diphenylamine; and the anionic surfactant is petroleum sodium sulfonate. The preparation method of the ultra quick quenching oil is simple and convenient; the obtained quenching oil has the advantages of ultra high cooling speed, good thermal oxidation stability, long service life and continuous and stable property retention; little peculiar smell, smog and carbon deposit are produced, and the take-out consumption of a workpiece is low; and after the workpiece is quenched by adopting the quenching oil, the workpiece has the advantages of high and uniform surface hardness, deep quenching layer, low deformation, metallographic structure, good mechanical property and good brightness, the surface of the workpiece does not become black, and the workpiece is easily cleaned.
Owner:上海德润宝特种润滑剂有限公司

Low-cost acid resistant pipeline steel hot-rolled plate and manufacturing method thereof

The invention discloses a low-cost acid resistant pipeline steel hot-rolled plate and a manufacturing method thereof. The hot-rolled plate consists of the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.05 to 0.50 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.08 percent of Nb, 0.005 to 0.030 percent of Ti, 0.010 to 0.050 percent of Als, 0.0010 to 0.0040 percent of Ca, less than or equal to 0.0060 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0010 percent of O, and the balance of Fe and inevitable impurities. The nonmetallic inclusions A/B/C/D are less than or equal to grade 2.0, and the pearlite belt tissues are less than or equal to grade 2.0. The manufacturing method for the hot-rolled plate is characterized by comprising the following steps of: directly feeding the components into a heating furnace at the temperature of between 500 and 850 DEG C after continuous casting is finished to perform heating, and discharging the heated product at the temperature of between 1,150 and 1,250 DEG C to perform rolling; controlling rolling of a rough mill and a finishing mill at two stages, wherein the final rolling temperature of rough rolling is between 950 and 1,050 DEG C, the final rolling temperature of finish rolling is between 770 and 870 DEG C, and the finish rolling compression ratio is more than 60 percent; and controlling cooling by adopting a laminar flow cooling device after rolling, wherein the cooling speed is 8 to 20 DEG C per second, and the final cooling temperature is between 550 and 700 DEG C.
Owner:ANGANG STEEL CO LTD
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