996 results about "Ladle furnace" patented technology

The invention discloses a manufacturing method of low-cost and high-purity medium-carbon bearing steel used for automobile hubs; the manufacturing method comprises the following steps: (a) the mass percentage of the components of the bearing steel is as follows: C: 0.55 percent to 0.58 percent, Si: 0.15 percent to 0.35 percent, Mn: 0.80 percent to 0.85 percent, P: less than or equal to 0.030 percent, S: less than or equal to 0.015 percent, Cr: 0.10 percent to 0.20 percent, Ni: less than or equal to 0.25 percent, Cu: less than or equal to 0.20 percent, Mo: less than or equal to 0.08 percent, Al: 0.008 percent to 0.015 percent, Ti: less than or equal to 30ppm, O: less than or equal to 15ppm, and the rest are Fe and inevitable impurities; (b) smelting, electric furnace initial melting+ ladle furnace refined melting+ vacuum degassing; (c) continuous casting into steel billet; (d) rolling. Compared with the prior art, the technological process has obviously shorter process and lower production cost; the impact resistance, torsion resistance, wear resistance and fatigue endurance of the produced automobile hub bearing are good.

The invention discloses bridge structure steel and a production method thereof. The production method comprises: pretreating molten iron; smelting in a top and bottom combined blown converter; refining in a ladle furnace (LF); performing Ruhrstahl Heraeus (RH) refining; continuously casting plate blanks; rolling wide and thick plates; and performing normalizing heat treatment. The produced bridge structural steel comprises the following chemical components in percentage by weight: 0.11 to 0.16 percent of C, 0.10 to 0.45 percent of Si, 1.35 to 1.70 percent of Mn, less than or equal to 0.010 percent of S, less than or equal to 0.020 percent of P, 0.025 to 0.060 percent of Nb, 0.008 to 0.030 percent of Ti, 0.025 to 0.080 percent of V, 0.10 to 0.50 percent of Ni, 0.015 to 0.060 percent of Als, less than or equal to 40*10<-6> of N, less than or equal to 40*10<-6> of O, less than or equal to 2*10<-6> of H and the balance of iron and inevitable impurities, wherein Als represents Alsol. The lower yield strength of the steel plates produced by the method is not less than 370MPa, the tensile strength of the steel plates is not less than 510MPa, the yield to strength ratio of the steel plates is not more than 0.75, the percentage elongation after fracture of the steel plates is not less than 30 percent, the longitudinal AKv of the steel plates at -40 DEG C is not less than 240J, and the steel plates meet the requirements for manufacturing high-speed multi-track railway bridges and can be promoted to be used in engineering structures such as building, transport and ocean platforms.

The invention discloses high-toughness medium-carbon quenched and tempered round steel of the grade 120 KSI. The high-toughness medium-carbon quenched and tempered round steel of the grade 120 KSI comprises, by mass, 0.35%-0.50% of C, 0.15%-0.40% of Si, 0.60%-1.30% of Mn, equal to or less than 0.015% of P, equal to or less than 0.040% of S, 0.75%-1.30% of Cr, 0.15%-0.35% of Mo, equal to or less than 0.25% of Ni, equal to or less than 0.25% of Cu, 0.015%-0.040% of Alt, equal to or less than 0.10% of V, equal to or less than 0.10% of Nb, equal to or less than 0.05% of Ti, equal to or less than 0.008% of N, equal to or less than 0.0010% of B and the balance Fe and unavoidable impurity elements, wherein the content of V, the content of Nb and the content of Ti are not equal to or less than 0.010% at the same time. The round steel with the maximum specification reaching 260 mm is manufactured through Kanbara reactor (KR) pretreatment, basic oxygen furnace (BOF) smelting, ladle furnace (LF) refining, Ruhrstahl Heraeus (RH) vacuum degassing, continuous casting, heating, continuous rolling, and hardening and tempering, so that the requirements for high specifications and toughness are met.

A method for manufacturing high-cleaning and high carbon complex bearing steel includes: 1) choosing charging mixture 2) first steel making molten steel by is greater than or equal to 30ton electric furnace a. smelting furnace burden b. running out foaming slag and adding lime c. alloying when steel tapping with 92% tap and >90% level 3) refining molten steel by steel ladle furnace a. cleaning steel ladle and furnace cleaning b. through bottom blowing argon mixing with 60 min, earlier stage argon blowing intensity 0.4Mpa and later stage 0.3Mpa, material adding amount is less than or equal to 8Kg/ton steel c. precipitating and deoxidizing by two-stage aluminum feeding method, adding crystallized silicon powder, fluorite(content of calcium is greater than or equal to 98%) into slag face, and dispersing deoxidizing 4) vacuum furnace treating a. bottom blowing argon 0.3Mpa, 25min, vacuum content is less than or equal to 140Pa b. bottom blowing argon mixing 15min, 0.1Mpa without materials after treating 5) molten steel mould casting under inactive gas a. ingot moulding temperature 70deg.C, runner brick coating b. pouring speed 5.1ton steel/min of ingot body and mouth. It achieves high yield.

The method relates to an 800 MPa-grade low-yield-ratio structural steel plate and a production method thereof. The steel comprises the chemical components in percentage by weight: 0.045 to 0.075 percent of C, 0.30 to 0.55 percent of Si, 1.55 to 1.95 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.0025 percent of S, 0.012 to 0.035 percent of Al, 0.15 to 0.25 percent of Cr, 0.15 to 0.3 percent of Mo, 0.2 to 0.4 percent of Cu, 0.2 to 0.4 percent of Ni, 0.008 to 0.04 percent of Nb, 0.008 to 0.04 percent of V, 0.008 to 0.03 percent of Ti, 0.0008 to 0.0015 percent of B, and the balance of Fe and inevitable impurities. The steel is subjected to RH vacuum treatment, ladle furnace (LF) external refining, full protection casting, a thermo mechanical control process (TMCP), and tempering heat treatment to form the steel plate with low yield ratio, high strength and high work hardening rate. The steel plate has the thickness specification of between 10 and 40 mm, the yield strength of more than or equal to 550MPa, the tensile strength of more than or equal to 800 MPa and the yield ratio of less than 0.70, and has excellent low temperature compact performance, cold forming performance and welding performance.

The invention relates to a hardening and tempering high-strength steel plate for wood based panel equipment and a production method of the steel plate, and belongs to the field of manufacturing low-alloy high-strength structural steel. The steel plate consists of the following chemical components in percentage by weight: 0.18 to 0.24 percent of C, 0.20 to 0.50 percent of Si, 0.80 to 1.20 percent of Mn, more than or equal to 0.02 percent of P, more than or equal to 0.01 percent of S, 0.20 to 0.50 percent of Mo, 0.20 to 0.50 percent of Ni, 0.70 to 1.00 percent of Cr, more than or equal to 0.003percent of B, 0.017 to 0.030 percent of Nb, 0.040 to 0.050 percent of V, 0.017 to 0.026 percent of Ti, and the balance of Fe and inevitable impurities. The production method of the steel plate comprises the following steps of: electric furnace smelting, vacuum decarburization /vacuum arc decarburization (VD/VOD) furnace vacuum decarburization, ladle furnace (LF) furnace refining, continuous casting (die casting), billet steel (ingot) clearing, heating, plate rolling, hardening and tempering, steel plate checking and polishing, tempering, sampling inspection, and warehousing. The hardening andtempering high-strength steel plate for the wood based panel equipment adopts Cr-Ni-Mo-B system micro-alloy elements for composite strengthening, and acquires good obdurability matching through a reasonable heat treatment process, and simultaneously the welding performance of a thick plate is not reduced.

The invention relates to a low-carbon bainitic steel for engineering machinery, which is prepared from the following chemical components in percentage by weight: 0.05-0.10% of C, 0.20-0.50% of Si, 1.50-1.80% of Mn, at most 0.010% of S, at most 0.018% of P, at most 0.10% of Nb, at most 0.10% of Mo, 0.010-0.040% of Ti, 0.0010-0.0030% of B, 0.20-0.50% of Cr, 0.015-0.050% of Al and the balance of Fe and trace impurity. The existing equipment is utilized; molten iron pretreatment, reblowing converter smelting, LF (ladle furnace) refining, RH refining, and plate blank continuous casting are carried out; and the contents of part of elements are adjusted, microalloying treatment, TMCP (thermomechanical rolling process) production, controlled rolling and water cooling are carried out, and no heat treatment is required, thereby obtaining the bainitic steel for engineering machinery, which has the advantages of high strength and favorable low-temperature toughness. The bainitic steel for engineering machinery is widely used in the fields of engineering machinery manufacturing and the like, such as large-size load-bearing steel structures, large-size earth mover, autocranes, excavators, mining machines, hydraulic supports, electric wheel dump trucks, mine cars and the like.

The invention relates to a process for smelting ultra-low-carbon steel, which comprises melted iron pretreatment desulfuration, converter smelt, LF furnace refining, RH vacuum process and continuous casting procedure in turn. Converter smelt tapping adopts non deoxidization tapping, steel which is tapped off is refined by LF ladle furnace before carried out melt iron vacuum decarburization processing, wherein refining is mainly used to proceed modifying property processing and further desulfuration and heating for top slag of melted iron, and the melted iron is reinforced with positive oxygen blowing decarburization after shifted into a RH vacuum container. The process can control carbon, nitrogen and sulfur in steel to preset objects which are required, and has excellent castability when a casting machine casted, thereby realizing casting by several furnaces.

The invention relates to quake-proof construction steel with lamellar tearing resistance and excellent performance and a production method thereof. The steel is suitable for steel plates of which the thicknesses are between 20 and 100 millimeters and comprises the following chemical components: less than or equal to 0.015 percent of C, less than or equal to 0.015 percent of Si, less than or equal to 0.015 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.02 to 0.04 percent of Nb, 0.005 to 0.020 percent of Ti, 0.010 to 0.060 percent of Als and the balance of Fe. The method comprises the following steps of: performing the pretreatment of molten iron; performing desulfuration treatment; controlling target components of a smelting terminal point, wherein the target components comprise 0.05 to 0.07 percent of [C] and less than or equal to 0.015 percent of [P]; refining through a ladle furnace, and feeding aluminum wires and blasting argon; performing relative humidity (RH) vacuum treatment, and introducing the argon before the treatment; adding SiCa wires; casting continuously and performing the pouring of full-process protection; heating casting blanks; performing rough rolling; performing precision rolling; and cooling. The steel of the invention has the excellent quake-proof performance (ReH/Rm is less than or equal to 0.77); and the contractibility rate of a cross section in the full-thickness direction is between 40 and 70 percent, so the steel meets the requirements of key stressed points of major constructions such as steel structure work and the like fully.

The invention discloses a production technology of a non-modulated plastic die steel thick plate. The production technology comprises the following steps: converter smelting and ladle furnace (LF) and Ruhrstahl Heraeus (RH) refining are adopted to pour a continuous cast billet; the heating temperature is 1150-1200 DEG C, the precision rolling temperature is 900-950 DEG C, the finish rolling temperature is 860-900 DEG C; the cooling control of the steel plate is performed after the steel plate is rolled, the phase transformation strengthening and the precipitation strengthening of the microalloyed carbon nitride are utilized to ensure that when the section of the steel plate is not modulated, the structure and performance are uniform along the section, the plastic die steel of which section hardness is 300-340 is obtained; the rolled steel plate is tempered to eliminate the stress and avoid sawing crack, the hardness of the steel plate is uniform after tempering, and the section has granular bainite structure. In the production technology, the alloy component is controlled, Ni is not added, a small amount of Mo, B and V are added and the Cr content is increased properly, thus the steel plate has higher hardenability; and the cooling control of the rolled steel plate is performed to ensure that the large-section steel plate has bainite structure. The production technology is suitable for the production of the non-modulated plastic die steel thick plate, which is prepared from the 320mm continuous cast billet and of which thickness is less than 120mm.

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 relates to low temperature-resisting H-shaped steel and a preparation method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.12-0.22 percent of C, 0.10-0.40 percent of Si, 1.1-1.50 percent of Mn, not more than 0.025 percent of P, not more than 0.025 percent of S, 0.02-0.05 percent of Nb and the balance of iron and trace impurities. The preparation method of the low temperature-resisting H-shaped steel comprises the following steps of: desulfurizing, smelting by using a 120-ton top and bottom combined blown converter, refining by using an LF (Ladle Furnace), continuously casting shaped blanks and rolling large H-shaped steel, wherein after the refinement outside the furnace, the oxygen content in molten steel is not more than 10ppm, and in the continuously-casting process, the superheat degree is controlled to be 20-30 DEG C, the specifications of casting blanks are 555*440*90, 750*370*90 and 1024*390*90, the soaking temperature of a heating furnace is 1200-1300DEG C, the initial rolling temperature at the outer side of a flange is 1100-1180 DEG C, the temperature at the center of a web plate is 1100-1170 DEG C, the final rolling temperature at the outer side of the flange is 850-960 DEG C, the temperature at the center of the web plate is 800-880 DEG C, and the H-shaped steel with the specification of H250-H900 isrolled.

The invention discloses a 120mm low temperature pressure vessel 16MnDR steel thick plate. The thick plate comprises the following chemical components by weight percent: 0.10-0.17% of C, 0.25-0.45% of Si, 1.10-1.40% of Mn, 0.015% or less of P, 0.005% or less of S, 0.015-0.055% of Als, 0.015-0.045% of Nb, 0.010-0.020% of Ti and the balance Fe and residual elements. The carbon equivalent [Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15] is no more than 0.40. The production method comprises the following technologies: KR molten iron pretreatment, converter smelting, argon-blowing treatment, ladle furnace (LF) refining, vapor deposition (VD) refining, die casting, heating, controlled rolling and controlled cooling, stack cooling and heat treatment. On the basis of ensuring the 16MnDR components, the content of harmful elements in the steel such as P and S which can influence the plasticity and toughness of the steel plate can be strictly controlled; the heating cycle of steel rolling is strictly controlled, the finish rolling temperature, re-reddening temperature and the cooling rate are strictly controlled in the rolling process; and by adopting the methods such as steel plate stacking and slow cooling, each performance index of the 120mm steel plate of the 16MnDR steel can meet the standard requirement.

The invention relates to hot rolling ferrite/bainite high strength steel and a manufacturing method thereof. The hot rolling ferrite/bainite high strength steel comprises the following main chemical components by mass percentage: 0.05-0.10% of C, 0.20-0.50% of Si, 0.80-1.30% of Mn, 0.02-0.06% of Alt, 0.40-0.8% of Cr, less than or equal to 0.09% of P, less than or equal to 0.010% of S, less than or equal to 0.006% of N, and the balance of Fe and unavoidable impurities. The manufacturing method of the hot rolling ferrite/bainite high strength steel comprises the steps of molten iron pretreatment, converter smelting, alloy fine adjustment and argon blowing, LF (ladle furnace) refining, a continuous casting heating technology, a rolling technology, a cooling technology and a rolling technology. According to the steel and the method, C and Mn contents are strictly controlled based on the composition of C-Mn steel, an Si content is reduced, Cr and P are added appropriately, Nb, V and Ti microalloy elements are not added, noble alloys such as Mo and Ni are not added, the cost is lowered greatly, the hot rolling ferrite/bainite dual phase steel with the tensile strength reaching 550-650MPa is obtained by adopting an appropriate rolling and cooling control technology, a hole expansion rate is high, and the forming property is excellent.

The invention discloses a method for smelting tire cord steel and a method for continuously casting tire cord steel; the methods comprise the following steps of: (1), carrying out primary smelting on molten iron or semi-steel by converter top-bottom blowing, and tapping into a steel ladle without deoxidization; (2), carrying out recarburization and pre-alloying on the molten steel in the tapping process, so on the basis of the total weight of the molten steel, the activity oxygen content in the molten steel is 0.004-0.008wt%, the C content is 0.64-0.68wt% and the Al content is less than 0.4wt%; (3), blowing argon to the molten steel in the steel ladle after tapping, and carrying out vacuum refining and alloy fine adjustment; and (4), carrying out ladle furnace refining on the molten steel which is subjected to the vacuum refining by using the manner of bottom blowing argon, adding refining slags batch by batch and adding deoxidizing agents batch by batch, so the total content of FeO and MnO in the steel ladle top slag is less than or equal to 10wt%. In the methods, the tire cord steel is produced by using the technological process consisting of converter primary smelting, vacuum refining and steel ladle furnace refining and cogged ingot continuous casting pouring, and thus the clean production of tire cord steels is achieved.

The invention relates to an utilization method of steel slag, which includes the following steps: slagging materials are added into an LF ladle refining furnace for slagging and refining and 20kg to 50kg/t of the slagging materials are added into each ton of molten steel; then in the moulding process, the slags of the ladle furnace and remanent molten steel after moulding are returned to an electric furnace for smelting; the slagging materials are added into the electric furnace and 50kg to 70kg/t of the slagging materials are added into one ton of the molten steel; in the smelting process of the electric furnace, the adding amount of the slagging material lime and the power supply volume of the electric furnace are decreased; as for steel grades which need to be deaerated, after the LF ladle refining furnace is refined and slags are made after the slagging materials are added, the molten steel is sent to a VD vacuum degassing furnace for deaeration; then moulding is carried out; and the slags of the ladle furnace and remanent molten steel after moulding are returned to the electric furnace for smelting. The utilization method of the steel slag is lower in cost and can avoid sulfur enrichment in the ladle refining process.

The invention relates to a method for additionally adding an electric field in a ladle furnace to deoxidate and refine without pollution and a device of the method, which belong to the technical field of the refining technology. The method is characterized in that the method comprises: additionally adding the electric field between molten steel or molten metal and molten slag in the ladle furnace, taking the molten slag as a channel which transmits dissolved oxygen in the molten steel or the molten metal outwards, applying a direct current pulse electric field between the molten steel or the molten metal and the molten slag which is on the molten steel or the molten metal, controlling the transmitting direction and the speed of oxygen atoms from a system between the molten steel or the molten metal and the molten slag, simultaneously reinforcing the mass transfer process of the dissolved oxygen in the molten steel or the molten metal, and thereby realizing deoxidation of the molten steel or the molten metal without pollution. The invention has the advantages of simple technology, convenient operation, rapid and effective deoxidation and the like.

The invention discloses a steel plate smelting method for improving high heat input welding performance. The method comprises the following process flows of converter steel smelting, ladle furnace refining, vacuum furnace refining and continuous casting; and steel comprises the following chemical components in percentage by mass: at most 0.10% of C, 0.1-0.3% of Si, 1.3-1.7% of Mn, at most 0.015% of P, at most 0.005% of S, 0.01-0.12% of Ti, at most 0.5% of Ni, at most 0.5% of Cu, at most 0.3% of Cr, at most 0.3% of Mo, 0.0001-0.005% of Mg, 0.0005-0.002% of B, 0.005-0.025% of Al, 0.001-0.003% of Ca, at most 0.005% of N, at most 0.005% of O and the balance of Fe. A proper deoxidizing agent adding sequence is adopted, the oxygen content is precisely controlled, small and dispersed nano-level occluded foreign substances are formed in molten steel, and the growth of austenite crystals in a welding heat affected zone is effectively pinned, thus the requirements for steel plates for high heat input welding can be met.

The invention discloses a 100-150mm alloy structural steel 4140 thick plate and a production technique thereof. The 100-150mm alloy structural steel 4140 thick plate comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.20-0.30% of Si, 0.85-0.95% of Mn, at most 0.010% of P, at most 0.003% of S, 0.020-0.040% of Als, 0.9-1.0% of Cr, 0.17-0.23% of Mo, and the balance of Fe and residual elements. KR molten iron pretreatment, converter smelting, argon blowing, LF (ladle furnace) refining, VD (vacuum degasser) refining, die casting, steel ingot slow cooling, steel ingot conditioning, heating, controlled rolling, cooling in pile, heat treatment and slow cooling are utilized to strictly control the contents of P, S and other harmful elements capable of influencing the plasticity and toughness of the steel plate, thereby ensuring the minimized internal residual stress of the 4140-grade 100-150mm-thick steel plate; and the internal quality is acceptable, and various performance indexes satisfy the standard requirements. The reasonable quenching and tempering technique is utilized to ensure that various properties of the 4140 steel plate satisfy the requirements.

The invention relates to a ladle furnace use nitrogen gas nitrogen alloying process. The process comprises the following steps: a) smelting nitrogen-contained stainless steel, controlling the components of the molten steel except the nitrogen to the targeted components, and controlling a nitrogen flush initial temperature at 30 to 50 DEG C above a refining treatment out-station temperature; b) during the nitrogen bottom blowing for the smelting of the nitrogen-contained stainless steel in the LF furnace, adding 1 to 20 ppm of nitrogen to each standard cube of nitrogen; c) during the nitrogen bottom blowing for the micro-alloying treatment, controlling the nitrogen flow at 6 to 120m<3>/h and the nitrogen flush pressure at 0.60 to 0.80 MPa; and d) when the nitrogen bottom blowing is finished, carrying out the argon bottom blowing for 4 to 6 minutes with the argon flow of 2 to 20 m<3>/h so as to average the stainless steel components and temperature. The process adds the nitrogen alloying function through the nitrogen bottom flowing to the ladle furnace (LF) in the prior stainless steel production process so as to replace a nitro alloy, make the nitrogen-contained stainless steel carry out continuous and stable nitrogen alloying in the ladle furnace, improve the purity of the molten steel, and consequently improve the molten steel quality and reduce the production cost.

The invention discloses a control method for nitrogen content of molten steel of wear-resistant steel. By virtue of optimization of a converter tapping technology, improvement of orders of deoxidizing slagging and alloying of an LF (Ladle Furnace), as well as rational control on ladle bottom argon blowing flow rate and pressure in different smelting stages, and complete protective casting of continuous casting process, the nitrogen content of the molten steel can be controlled within 0.0030% after converter tapping, nitrogen adding in molten steel during LF+RH (Ladle Furnace process +Ladle Furnace process) is steadily controlled within 0.0010%, nitrogen adding in molten steel in the continuous casting process is steadily controlled within 0.0005%, and finally, nitrogen content in a high alloy wear-resistant steel continuous casting billet is controlled within 0.0045%, therefore, internal quality and surface quality of the casting billet are improved greatly.