3051 results about "Electric furnaces" patented technology

The invention relates to a straightening roll and the manufacturing process thereof, wherein, the composition of the roll includes 0.60wt percent to 1.10wt percent of C, 0.20wt percent to 1.0wt percent of Si, 0.20wt percent to 0.60wt percent of Mn, 0.20wt percent to 1.00wt percent of Ni, 4.00wt percent to 6.00wt percent of Cr, 0.20wt percent to 1.00wt percent of Mo, 0.10wt percent to 0.50wt percent of V, less than or equal to 0.02wt percent of P, less than or equal to 0.02wt percent of S and the rest, Fe and other inevitable impurities; the manufacturing process of the roll includes: electric furnace smelting to secondary refining to ingot casing to electrode rolling to electrode rough machining to electroslag remelting to ingot casing to hydrogen diffusion annealing to forging to conditioning treatment to ultrasonic flaw detection and microscopic and macroscopic test to rough machining to quenching and tempering heat treatment to semifinishing to final heat treatment to finish machining to finished product. The invention increases the service life of the straightening roll and the surface quality of strip steel and eliminates the bottleneck in straightening high strength plate during production.

The invention is about the X70 needle ferrite in-line steel, which has the toughness of crack arrest. The percentage composition is C 0.020-0.060,Mn 1.45-1.75,Si 0.100-0.500,S¿Q0.0020,P0.004-0.012,Nb0.050-0.080,Ti0.005-0.025,V0.010-0.060,Mo0.10-0.30,Cu¿Q0.30,Ni¿Q0.30,Ca0.0015-0.0040,N¿Q0.0080,Altotal0.015-0.045. The process is: a. refining by coverter or electric furnace; b. refined outside of the furnace, vacuum degass by RH, desulfurating by LF, Ca treatment; c. continuous metal cast process; d. hot rolling, the terminal temperature of the coarse crushing is 950-1000 Deg C.,the terminal temperature of finish rolling is 780-880 Deg C., the compression ratio of the non-recrystallized region is above 70%; e. batching, temperature is 480-580 Deg C..

The invention discloses an electric locomotive pantograph copper-impregnated carbon contact strip producing method. The method comprises the steps that 1, pitch coke powder, graphite powder, siliconized graphite powder and high temperature pitch are mixed according to the proportion to be ground into powder; the mixed powder is prepressed into a stage stock column, and then the stage stock column is solidified and squeezed to be molded and roasted, so that a composite carbon contact strip is obtained; 2, the composite carbon contact strip is cleaned and dried, then is cooled and placed into a graphite crucible, and is placed in an electric furnace at temperature of 1300-1400 DEG C to be preheated; copper liquid is poured into the crucible to soak the composite carbon contact strip, then the crucible is placed in an oil press cover, nitrogen is led in, heat preservation is kept for 3-5 min under the specific intensity of pressure, and finally cooling is carried after pressure releasing. According to the electric locomotive pantograph copper-impregnated carbon contact strip producing method, the electroconductibility of the copper-impregnated carbon contact strip is improved, the electrical resistivity is lowered, the mechanical strength of the carbon contact strip and copper impregnated angle can be increased, then the carbon contact strip abrasive resistance and self-lubrication are improved, the copper-impregnated carbon contact strip is more resistant to abrasion, main line damage and block dropping are avoided, the shock resistance is high, and the service life of the copper-impregnated carbon contact strip is prolonged.

The invention discloses a strength determination method for reacted blast furnace coke, which comprises the following steps of: (1) placing a coke sample in a reactor; (2) putting the reactor in an electric heating furnace; (3) inserting a temperature thermocouple into the coke in the reactor;(4) putting an electronic balance on a lifting table and connecting the electronic balance and the reactor through a chain; (5) regulating the electric furnace to heat through a temperature controller and introducing nitrogen when the temperature in the center of a material layer reaches 400 DEG C; (6) introducing carbon dioxide gas when the temperature in the center of the material layer reaches 780 DEG C; (7) cutting the nitrogen and introducing prepared mixed gas when the temperature in the centerof the material layer reaches a certain value, maintaining the temperature of the heating furnace, and when the loss ratio of the coke samples reaches the required value continuously introducing the carbon dioxide gas or the mixed gas, introducing the nitrogen and cooling after the carbon dioxide gas or the mixed gas reaches the specified dissolve loss quantity; and (8) stopping introducing the nitrogen and cooling naturally when below 100 DEG C. The invention more truly reflects the actual conditions of the coke in a blast furnace, and the prediction of the thermal properties of the coke is more accurate.

The invention discloses a preparation method of wear-resistant high-chromium cast iron and belongs to the technical field of metal materials. According to the preparation method, common scrap steel, carburant, ferrochromium, ferromolybdenum, copper plates, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum are smelted in an electric furnace so as to form the wear-resistant high-chromium cast iron. The molten wear-resistant high-chromium cast iron comprises the following chemical components in percentage by mass: 3.0-3.5% of C, 18-25% of Cr, 0.3-0.5% of Mn, 0.3-0.5% of Si, 0.18-0.25% of N, 0.5-0.8% of Mo, 0.2-0.4% of B, 0.08-0.12% of Al, 0.5-1.0% of Cu, less than 0.05% of S, less than 0.05% P and the balance of Fe. Molten iron is treated with an inoculator when taken out from the electric furnace, and is treated with a suspending agent when poured, so as to obtain fine solidification structures. Therefore, the wear-resistant high-chromium cast iron has excellent properties.

A conticasting and tandem rolling technology for manufacturing the high-strength and-weatherability Ti-microalloyed steel plate includes such steps as smelting, refining, conticasting, solidifying, heating, hot rolling, laminar flow cooling and coiling. Its advantages are high strength, high shaping performance, high weatherability and high weldability.

The invention relates to a preparation method of foamed aluminum, in particular to a method for preparing the foamed aluminum by primarily foaming a melt, which can prepare a foamed aluminum product by primarily foaming aluminum. The method comprises the following steps of: starting a thermoelectric furnace for heating to 800 DEG C until the aluminum is fully molten; lowering the temperature to 680 DEG C, adding metal calcium into aluminum liquid and stirring so as to increase the surface viscosity of the melt; pretreating titanium hydride, adding pretreated titanium hydride into the melt and stirring to uniformly distribute the titanium hydride in the melt for full decomposing; and heating a mold, putting the melt into the thermally-treated mold, preserving heat and foaming at the temperature of 650 DEG C, taking a prefabricated member out, performing air cooling to shape the high-temperature foam melt in the mold and taking the prefabricated member out for water cooling so as to obtain the foamed aluminum product. When applied to a filling piece of a regular cavity, the method simplifies a process, greatly lowers production cost, is suitable for diversified development of industrial production and brings convenience to the research of specific technology.

The invention discloses a method for producing high-strength low-carbon bainite steel based on thin slab continuous casting and rolling process. The method includes the following steps: melting by using a rotary furnace or an electric furnace, refining molten steel in an LF furnace after the component analysis, performing the composition adjustment, continuously casting thin slabs, directly heating the thin slabs at the temperature of 950-1100 DEG C in a roller-hearth heating (soaking) furnace at a temperature not less than 1150 DEG C, controlling the tapping temperature of heated thin slabs in a range from 1050 DEG C to1160 DEG C, rolling by using a continuous rolling mill to produce plates, finishing at a temperature of 840-860 DEG C, performing laminar cooling, and coiling with a down coiler at a temperature of 550-600 DEG C to produce the steel coil. The method can produce non-tempered high-strength steel based on thin slab continuous casting and rolling process, and has the advantages of simple metallurgical composition of steel, low cost of alloying production, and stability in high toughness and good forming and welding properties of the steel coil.

The invention discloses high-carbon-chromium bearing steel and a manufacture method thereof. The high-carbon-chromium bearing steel comprises the following chemical compositions by weight percentage: C: 0.90-1.05; Cr: 0.90-1.20; Mn: 0.90-1.25; Si: 0.45-0.75; Al: 0.02-0.04; oxygen is less than or equal to 0.0007; phosphorus is less than or equal to 0.010; sulfur is less than or equal to 0.005; titanium is less than or equal to 0.0025; copper is less than or equal to 0.15; nickel is less than or equal to 0.10; nitrogen is less than orequal to 0.0070; and the balance of unavoidable impurities and Fe. The manufacture method comprises the following steps: smelting in an electric furnace, refining in a ladle arc furnace, degassing in a vacuum furnace, pouring steel liquid into steel ingots, heating steel ingots in a heating furnace, rolling the steel ingots into square billets by a rolling mill, heating the steel ingots in a heating furnace and rolling the steel ingots into round steel by a rolling mill. Compared with the prior art, the invention has high hardenability, high crystal grain size of more than 8 grade, high commonality in technology and wide application.

The invention relates to duplex stainless steel. The duplex stainless steel comprises the following chemical components in percent by weight: 0.01-0.08% of C, 0.2-1.0% of Si, 1.5-3.5% of Mn, 19.0-21.0% of Cr, 1.2-2.8% of Ni, 0.08-0.18% of N, less than or equal to 0.5% of Mo, less than or equal to 1.0% of W, less than or equal to 1.0% of Cu and the balance of Fe and inevitable impurities; PREN (Pitting Resistance Equivalent Number) is 20-24, the martensitic temperature Md formed by strain induction is 60-130 DEG C. A manufacturing method comprises the following steps of: selecting vacuum induction smelting in an electric furnace, argon oxygen decarburization (AOD) or electric furnace, argon oxygen decarburization (AOD), external refining and LF (Ladle Furnace) smelting; carrying out die casting or continuous casting on molten steel, controlling the superheat degree to be 20-50 DEG C in die casting, matching with fast cooling, preventing nitrogen from escaping, and controlling the overheat degree to be 20-50 DEG C and the plate blank casting speed to be 0.8-2m/min; and putting a die-casting blank or a continuous casting blank into a heating furnace for heating to 1100-1250 DEG C, preserving the heat for 0.5-1.5 hours, processing the die-casting blank or the continuous casting blank on a forging production line or a hot-rolling mill group to the needed thickness, then carrying out annealing at the speed of 0.5-2.5min/mm and the temperature of 1030-1150 DEG C. The obtained duplex stainless steel has excellent corrosion resistance and TRIP effect.

The invention provides a high-boron high-speed steel roller material and a smelting process thereof. The smelting process of the high-boron high-speed steel roller material comprises the following steps: firstly, adopting Q235 waste steel, ferrotungsten, ferromolybdenum, ferrovanadium, high carbon ferro-chrome, metal copper, metal aluminum, calcium-silicon alloy, rare earth ferrosilicon magnesium alloy, ferrocolumbium, ferroboron, ferrosilicon, vanadium-nitrogen alloy, zirconium ferrosilicon and ferrotitanium as materials for smelting low-alloy high-speed molten steel in an electric furnace; then, adding the ferrovanadium and part of ferroboron to carry out alloying in a discharging process; finally, adding part of ferroboron and composite modificator in a casting ladle, adding the vanadium-nitrogen alloy, the zirconium ferrosilicon, the ferrosilicon and part of ferroboron in the casting process. The obtained casting piece has a little alloy elements, excellent abrasive resistance and good thermal fatigue resistance. When the high-boron high-speed steel roller material is used as a roller, the service life is prolonged by more than six times relative to a high nickel-chrome infinite cast-iron roller, and prolonged by 20% relative to a high-vanadium high-speed steel roller. Moreover, the roller is safe to use and reliable.

The invention relates to spring steel and a production process thereof, in particular to 55Si2MnVNbN spring steel and a production process thereof. The 55Si2MnVNbN spring steel comprises the following components in percentage by weight: 0.52 to 0.60 percent of C, 1.60 to 1.90 percent of Si, 0.60 to 0.80 percent of Mn, 0.15 to 0.35 percent of Cr, 0.06 to 0.12 percent of V, 0.015 to 0.025 percent of Nb, 0.80 to 1.50 percent of N, less than or equal to 0.0035 of P, less than or equal to 0.0035 percent of S and the balance of Fe and inevitable impurities. The process comprises electric furnace electrosmelting, LF refining, VD furnace vacuum degassing, continuous casting and rolling. The spring steel can meet the requirements of springs on various severe working environments, high strength and long service life and has high tensile strength, high delayed fracture resistance, high corrosion resistance, high fatigue resistance and high elasticity attenuation resistance.

The invention relates to hot-work die steel for an extrusion wheel and a manufacturing method of the die steel. The invention adopts the technical scheme that the manufacturing method comprises the following steps: hot-forging after scrap steel or molten iron and scrap steel are smelted in an electric furnace and are subjected to electroslag remelting or vacuum induction melting and then carry out spheroidizing annealing at a temperature of 700-880 DEG C; quenching at a temperature of 1,020-1,120 DEG C and tempering at a temperature of 530-650 DEG C, wherein the hot-work die steel has a hardness of up to 40-52HRC and a tensile strength of up to 1,850-1,955MPa. The hot-work die steel comprises the following chemical components in percentage by weight: 0.30-0.50wt% of C, 0.80-1.20wt% of Si, 0.2-0.5wt% of Mn, 3.00-5.00wt% of Cr, 1.00-1.50wt% of Mo, 0.70-1.20wt% of V, 0.005-0.03wt% of N and less than 0.030wt% of P, less than 0.030wt% of S and the balances of Fe and inevitable impurities. The steel has the characteristics of low cost, good thermal fatigue property, high heat stability and excellent comprehensive property and can be used for manufacturing the extrusion wheel of a continuously-extrusion-molded coating machine and other hot-work dies.

The invention belongs to the technical field of metal wear-resistant materials and particularly relates to a wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium and a heat treatment method thereof. The wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium comprises the components of the following mass percentages: 0.35 to 0.65 wt percent of C, 5.0 to 7.0 wt percent of Cr, 0.003 to 0.006 wt percent of B, 0.2 to 0.5 wt percent of Si, 0.8 to 1.0 wt percent of Mn, 0.03 to 0.08 wt percent of Y, 0.05 to 0.15 wt percent of Ti, 0.04 to 0.08 wt percent of V, 0.02 to 0.05 wt percent of N, less than 0.04 wt percent of S, less than 0.05 wt percent of P and the balance of ferrite. The wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium can be manufactured by an electric furnace using a sand casting. The invention carries out step quenching by using two types of quenching oils with different temperatures, thus leading to depth of more than 60mm of the quenching full hardening layer of the cast steel, high hardness, good uniformity of the hardness, and no cracks in the heat treatment. The casting steel is free of expensive alloying elements such as molybdenum or nickel, raw materials resource is rich, the manufacture cost is low and economic benefit is good.

The invention provides high-performance ocean platform steel and its production method. When the thickness of a steel plate is 8-40mm, the steel plate is composed of the following chemical components, by weight, 0.11-0.13% of C, 0.20-0.50% of Si, 1.45-1.55% of Mn, 0.012% or less of P, 0.003% or less of S, 0.035-0.045% of V, 0.025-0.030% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities; and when thickness of a steel plate is 40-100mm, the steel plate is composed of the following chemical components, by weight, 0.10-0.12% of C, 0.20-0.50% of Si, 1.50-1.60% of Mn, 0.012% or less of P, 0.003% or less of S, 0.070-0.075% of V, 0.030-0.040% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities. The production method of the steel plate of the invention comprises the steps of electric furnace smelting, LF furnace refining, VD vacuum treatment, continuous casting (or die casting), heating, control rolling, cooling, stacking, and normalizing to prepare the steel plate. Through a reasonable component design and process optimization, the steel plate of the invention has excellent mechanical performances, welding performances and processing performances, and has strong market competitiveness.

Belonging to the technical field of alloy steel preparation processes, the invention relates to an ultrahigh thermal conductivity wear-resistant hot stamping die steel and a manufacturing method thereof. Current hot stamping die steel on the market is mainly various improved H13, H11 and other high alloy hot work die steel. The steel provided by the invention comprises the following components by mass percent: 0.33-0.40% of C; less than 0.30% of Si; less than 0.30% of Mn; 1.0-2.0% of W; 4.0-5.0% of Mo; less than 0.30% of Cr; 0.10-0.20% of V; and the balance Fe and inevitable impurities. And in the impurity elements, S is smaller than or equal to 0.01%; P is smaller than or equal to 0.01%; and O is smaller than or equal to 30ppm. The steel is characterized in that: simple C, Mo and W are adopted as the main elements to coordinate the ratio of carbides; low Mn, low Cr and low Si content are maintained; after electric furnace smelting, electroslag remelting, annealing, high temperature homogenization, forging and annealing, the material has good machining properties; and after heat treatment, the material has excellent impact toughness, tempering stability and thermal fatigue performance. With ultrahigh thermal conductivity, the steel can be more suitable for hot stamping.

The invention provides a martensite precipitation hardening stainless steel for structural member and a manufacturing method thereof. The martensite precipitation hardening stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.05 percent of C, 13.50 to 15.50 percent of Cr, 2.5 to 4.0 percent of Cu, 3.0 to 5.0 percent of Ni, 0.15 to 0.40 percent of Nb and Ta, 0.010 to 0.040 percent of N, 0.050 to 0.15 percent of V, less than or equal to 0.80 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities. The stainless steel is smelted by combining an electric furnace, AOD refining and vacuum self-consuming technology, so the stainless steel has the characteristics of high strength, good plasticity, good corrosion resistance and the like, and can meet the requirements of high-strength components such as high-pressure values, oil drill, efficient heavy-duty machinery and the like on material performance.

The invention discloses a preparation technology of a TC17 titanium alloy wire. The preparation technology is characterized by comprising the following steps of: rolling the TC17 titanium alloy into a disk with specification of (Phi)12mm; performing three times of grinding on the (Phi)12mm disk; after the grinding and when the total working rate reaches 30%, performing heat treatment and stress relief annealing in an electric furnace or a vacuum furnace; when the diameter of the wire is greater than or equal to (Phi)10mm, controlling the stretching temperature at 780+/20 DEG C; when the diameter of the wire is less than (Phi)10mm, controlling the stretching temperature at 730+/-20 DEG C; repeatedly performing annealing-stretching-grinding-annealing of the wire after the heat treatment until the diameter of the wire is greater than or equal to (Phi)5.5mm, and performing vacuum heat treatment; before obtaining the finished product and after performing the vacuum heat treatment, removing the lubricant and scale impurity layer on the material surface by use of a round-blade mould with 0-5 degrees of internal and external taper angles according to the diameter of the finished product, stretching to obtain a bright wire with diameter of less than or equal to (Phi)5.0mm, and checking the finished product; and if the finished product is qualified, delivering as the finished product. The preparation technology disclosed by the invention makes up for the shortcoming that the TC17 titanium alloy wire cannot be produced domestically.

The invention belongs to the field of metallurgy and discloses a smelting process of Cr-Mn series spring steel. The smelting process of Cr-Mn series spring steel comprises the following steps: (1) by taking a low-sulfur molten iron and a high-quality steel scrap as the electric furnace smelting iron and steel materials, controlling the electric furnace end point carbon content to greater than 0.15%; (2) adding active lime and composite refining slag in the electric furnace tapping process, and adding calcium carbide to perform pre-deoxidation in the tapping process; (3) feeding an Al line in an argon station before LF refining; (4) producing high basicity white slag in the refining earlier stage and controlling the basicity of slag in the refining middle and later stages to 1.5-2.5; (5) controlling the ultimate vacuum front argon flow to 15-25 L/min and controlling the ultimate vacuum late argon flow to 30-45 L/min; (6) adding a granular alkaline covering agent and a carbonized rice hull to perform double protection by VD emptying; and (7) stabilizing the speed of continuous casting to 0.8-0.9 m/min, and controlling the degree of superheat to 20-30 DEG C. By adopting the process, the non-metallic inclusion content in the molten steel is reduced.

The invention discloses a method for preparing a magnesium and aluminum dissimilar metal clad plate. The method comprises the following steps: the removing of oxidization films on the surfaces of a magnesium plate material and an aluminum plate material, the stacking of the magnesium plate material and the aluminum plate material together, the continuous firm welding of four sides by a pulsed tungsten argon arc welding method, the placement of a magnesium and aluminum superposition piece in a tank-type electric furnace after four-side welding, the pressing of the superposition piece, the heating of the magnesium and aluminum superposition piece at a temperature of between 460 and 520 DEG C, the implementation of diffusive connection and other steps. The method does not need to adopt vacuum heating equipment with high price, has low connection temperature, can obtain the magnesium-aluminum diffusive welding clad plate of a crack-free brittleness-free compound in a common tank-type electric heating furnace; and the shearing strength of a connecting interface is between 22 and 30 MPa (reaching 50 percent of the shearing strength of a mother aluminum material) and can meet the using requirement of the magnesium and aluminum dissimilar clad plate.

The invention provides a method for recovering valuable metals by cooperatively disposing copper-nickel-cobalt smelting slag and gypsum slag. The method comprises: firstly adding solid or liquid copper-nickel-cobalt smelting slag into a slag-cleaning electric furnace, powering on for heating and constantly keeping a certain temperature scope, taking nitrogen as a carrier and spraying a reducing agent, the gypsum slag and a flux into the slag-cleaning electric furnace, so as to product a metal sulfonium phase and cleaned furnace slag through a reduction sulfuration reaction; and keeping warm, standing, sending the metal sulfonium phase to a fire-process blowing system through a siphon port for further recovering valuable metals, discharging the cleaned furnace slag from a slag discharge port and directly performing water quenching, so as to obtain the water-quenched slag which is applicable as a raw material for producing cement. By cooperatively disposing the copper-nickel-cobalt smelting slag and the industrial byproduct gypsum slag, efficient enriching recovery of copper, nickel, cobalt, gold, silver and other valuable metals in the smelting slag is realized, also an effective comprehensive utilization approach is provided for gypsum slag, and environmental pollution is avoided.

The invention discloses a precipitation-hardened stainless steel for a surgical instrument with excellent corrosion resistance and mechanical performance and a manufacturing method of the precipitation-hardened stainless steel. The indexes of the hardness, the toughness, the corrosion resistance, the mold resistance and the like of the precipitation-hardened stainless steel are all superior to martensitic stainless steel of the same kind. The precipitation-hardened stainless steel comprises the following components of, by weight, 0.005-0.08% of C, less than or equal to 0.05% of N, less than orequal to 1.0% of Si, 0.5-2.5% of Mn, less than or equal to 0.04% of P, less than or equal to 0.01% of S, 11.0-13.0% of Cr, 8.0-10.0% of Ni, greater than or equal to 0.03% and less than or equal to 0.10% of the sum of C and N, 2.0-5.0% of Mo, 1.0-4.0% of Cu, 0.5-2.0% of Ti, 0.15-1.5% of Al, less than or equal to (5*10<-4>)% of the product of Ti and N and the balance unavoidable impurities and Fe.The preparation method comprises the steps that (1) the set components are subjected to alloy smelting by adopting an electric furnace and an external refining mode, so that a steel ingot is formed; (2) the steel ingot is forged to be a steel slab after scalping is conducted, the heating temperature of the forging process is 1050-1250 DEG C, the heating time is 2-5 hours, and the finish forging temperature is 900-980 DEG C; (3) the steel slab is subjected to hot rolling by using a hot rolling machine, so that a hot rolled steel plate or steel belt is prepared, the hot rolling heating temperature is 1000-1200 DEG C, the heat preservation time is 2-5 hours, and the finish rolling temperature is 850-930 DEG C; (4) high-temperature solution treatment is conducted on the steel plate by adoptingsolid solution annealing furnace equipment, the solid solution temperature is 1000-1200 DEG C, the solid solution heat preservation time is 15-30 min, and a cooling mode is water cooling; and (5) aging treatment is conducted on the steel plate which is subjected to solid solution by adopting a heat treatment technology scheme at the temperature of 300-650 DEG C, the aging time is 2-8 hours, and the cooling mode is air cooling after ageing is conducted.

The invention relates to a method for producing an Mo-free low-Nb X80 pipeline steel hot rolled steel plate. The method comprises the following steps of: preparing raw materials in a ratio; smelting the raw materials by using a converter or an electric furnace; refining the smelted raw materials out of the furnace; casting the refined raw materials; reheating a plate blank; and performing controlled rolling and controlled cooling. The method is characterized in that: the heating temperature of the plate blank is of between 1,100 and 1,250 DEG C; the starting temperature of the controlled rolling in a recrystallization zone is of between 1,080 and 1,200 DEG C; the final temperature of the controlled rolling in the recrystallization zone is of between 950 and 1,080 DEG C; the starting temperature of the controlled rolling in a non-recrystallization zone is of between 860 and 950 DEG C; the compression ratio of the controlled rolling in the non-recrystallization zone is more than or equal to 75 percent; the final rolling temperature is of between 730 and 860 DEG C; the final cooling temperature is of between 300 and 550 DEG C; the cooling rate is of between 10 and 35 DEG C/s; produced steel has acicular ferrite and bainite structures and meets the requirement of API SPEC 5L on the performance of X90 pipeline steel; and production-manufacturing is low.