15 results about "Steelmaking" patented technology

The invention discloses a high-surface-quality hot-galvanized transformation induced plasticity (TRIP) steel plate and a manufacturing method thereof. The hot-galvanized TRIP steel plate is prepared from chemical components in percentage by weight as follows: 0.10%-0.15% of C, 1.20%-1.80% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 1.20%-2.40% of Als and the balance of Fe and inevitable impurities. The manufacturing method of the TRIP steel plate comprises the steps as follows: continuous casting steelmaking-hot rolling-cold rolling-continuous annealing and hot galvanizing. The structure form of the hot-galvanized TRIP steel plate prepared with the method includes ferrite, bainite, retained austenite and martensite, the grain size grade ranges from Grade 10.5 to Grade 11, the tensile strength ranges from 640 MPa to 670 MPa, the yield strength ranges from 395 MPa to 465 MPa, the ductility is higher than or equal to 30%, the strength and ductility product can be 23GPa% or above, and the plate has the high surface quality, mechanical performance and corrosion resistance.

The invention relates to a steelmaking production method of ultra-low silicon peritectic steel, and belongs to the technical field of iron and steel smelting. The production method comprises the working procedures of molten iron desulphurization, converter smelting, RH treatment and slab continuous casting; in the mass percent of the peritectic steel composition of the finished product, Si content is not more than 0.010%, C content is equal to 0.08-0.10%. In the invention, the production technology procedures of molten iron desulphurization, converter smelting, RH treatment and slab continuous casting are adopted, and high-quality ultra-low silicon peritectic steel of which the Si content is not more than 0.010% is produced; the technical problems that the Si content is easy to be out of limits, the inclusion control capability is insufficient, and the continuous casting slab quality is poor in the existing production technology are solved.

The invention discloses a method for producing high-temperature alloy by adopting induction heating vacuum refining, which is realized through the following steps that: in a 1 to 3-ton induction steelmaking furnace, induction is utilized to heat molten steel; the temperature of the molten steel is increased to 1380 DEG C to 1650 DEG C; 20 to 80 kg of CaO-Al2O3 (5 to 30 percent of Al2O3) refining slag series is added to the surface of the molten steel, wherein, CaO-Al2O3 contains 5 percent to 30 percent of Al2O3; after melting and refining slag, vacuum treatment is carried out by being covered with a vacuum cover; during the vacuum treatment, on one hand, argon gas is fed into the furnace through a porous plug at the bottom of the induction steelmaking furnace, and the flow of argon gas is kept at 5 to 20 liters/minute; on the other hand, the vacuum pressure in the induction steelmaking furnace is kept between 0 and 10Pa; the heating power of the induction steelmaking furnace is kept between 100 and 600KW; the refining time is kept between 15 and 45 minutes; after refining and vacuum treatment, slagging-off is carried out; under the protection of argon gas, tapping and ingot teeming are carried out; by adopting the method of the invention, gas contained in finished product and impurity contained in molten steel are greatly reduced; chemical compositions are very much uniform; product performance is greatly improved; besides, the production cost is greatly reduced.

The invention discloses a low-aluminum and low-silicon welding wire steel low-sulfur-control smelting method. After an electric furnace steelmaking is completed, alloying is carried out, the tapping quantity is controlled during the electric furnace tapping, and the electric furnace retains steel; stirring is carried out after tapping, and slags are poured out after stirring; the slags are placedin a refining furnace, after active lime and fluorite are added in batches, power supply slugging refining is carried out, after refining is carried out, active lime and fluorite are re-added, a deoxidizing slag-forming agent is added for diffusion deoxidation, metal manganese is added for supplementary for adjusting manganese content after sampling and analysis are carried out, after the power supply heating is carried out, the deoxidizing slag-forming agent is used to continue to diffuse and deoxidize to maintain white slag, when the temperature reaches 1615-1630 DEG C, sampling and analysisare carried out, when the mass percentage content of aluminum is small than or equal to 0.010%, the mass percentage content of silicon is small than or equal to 0.05, the mass percentage content of sulfur is small than or equal to 0.003%, and the manganese content is qualified, pure calcium rod cored wires are fed, and after the calcium is fed, static stirring is carried out for more than or equal to 15min; and after the temperature reaches 1595-1610 DEG C, continuous pouring is carried out, and thus low-aluminum and low-silicon welding wire steel is obtained.

The invention relates to the field of steel production, and discloses a steel billet testing method, device and system. The steel billet testing method includes the steps of carrying out releasing testing on steel billets according to steel billet production data, steelmaking chemical components, steelmaking releasing chemical component codes, steelmaking chemical component standard data and steel billet testing standard data so as to judge whether the steel billets meet the releasing conditions or not, when the steel billets meet the releasing conditions, sending a steel billet releasing indication to enable the steel billets to be released and enter a next production process, and when the steel billets do not meet the releasing conditions, carrying out transferring processing on the steel billets. Automatic processing of steel billet testing is achieved, and the steel billet testing efficiency is effectively improved.

The invention relates to the technical field of steelmaking equipment, and particularly to an efficient furnace maintenance method, which includes the following operating steps: step 1, shaking liquidslag to a large-area damaged position of a converter lining after tapping of the former heats; step 2, adding 2-3 tons of raw dolomite into the furnace; step 3, forwards shaking the converter flat, enabling the raw dolomite and the slag to be in full contact and paving the mixture into the large-area damaged position; step 4, sintering for about 3 minutes, shaking the converter to a slag-splashing furnace maintenance position, and splashing drying the slags; step 5, pouring out residual slag, adopting a slag retaining operation if less slags are left and directly adding the slags into steel scrap. The method provided by the invention is high in repairing efficiency and low in cost.

The invention discloses a system and method for preparing sulfuric acid by recycling waste crude ferric sulfate salt in iron and steel industry through pickling. In the preparation system, a rotary kiln, a bag-type dust collector, a filler absorption tower and an induced draft fan are sequentially connected through a connecting pipeline, and the induced draft fan provides suction force for the system, so the system runs in a negative pressure state. The waste crude ferric sulfate salt in iron and steel industry recycled through pickling is subjected to the following steps: (1) drying crude ferric sulfate salt crystals; (2) heating and decomposing the ferric sulfate crystal powder to obtain sulfur trioxide, sulfur dioxide and ferric oxide, wherein the ferric oxide can be used as a raw material for steelmaking and can also be used as a raw material for producing iron oxide red; (3) conducting gas filtration and dust removal; and (4) performing gas absorption, wherein sulfur trioxide is dissolved in water to directly generate sulfuric acid, sulfur dioxide is dissolved in water to generate sulfurous acid, and sulfurous acid is in the absorption liquid is oxidized into sulfuric acid by hydrogen peroxide. The system for preparing sulfuric acid from ferric sulfate has the advantages of adjustable scale, low investment, quick effect, high acceptable degree and strong applicability.

The invention relates to a center water-cooling convertor oxygen lance spraying head which is good in water-cooling effect, long in service life, and simple in manufacturing process. The spray head comprises an inner pipe, a middle-layer pipe and an outer pipe, wherein the inner pipe is a water entry, the water entry is arranged at the center of the oxygen lance spraying head, the lower side of the water entry is communicated with a water return channel, the circumferential seam between the middle-layer pipe and the outer pipe is the water return channel, the circumferential seam between the inner pipe and the middle-layer pipe is an oxygen channel, the oxygen channel is communicated with oxygen spray holes, the oxygen spray holes are formed at the periphery of the inner pipe, and the number of the oxygen spray holes is 3, 4, 5, 6, 7, 8, 9 or 10. The spraying head is suitable for various convertor oxygen steelmaking equipment, can carry out low-gun-position operation, is strong in oxygen penetrating capacity, good in stirring effect, rapid in slagging and low in splashing, prolongs the furnace life, lowers the FeO content in the slag, and lowers the steel consumption.

The invention relates to the technical field of steelmaking, in particular to a converter smelting method which comprises the steps that molten iron is subjected to converter smelting, and bottom blowing is conducted on the molten iron under the atmosphere of inert gas and carbon dioxide; wherein the flow of the inert gas and the bottom blowing time meet a first quadratic function relationship; the flow of the carbon dioxide and the bottom blowing time meet a second quadratic function relation, the flow of different gases in the bottom blowing mixed gas is changed along with the smelting progress in each ton of molten steel, and the flow of the carbon dioxide is controlled to be high in the middle stage of bottom blowing, so that high T.Fe can be guaranteed, slagging and dephosphorization are facilitated, and the dephosphorization efficiency is improved; in the later stage of bottom blowing, the oxidability of bottom blowing gas is reduced, and T.Fe is used for reducing the iron content (T.Fe) in slag and the end-point oxidability of molten steel.

The invention relates to a method for treating various steel slags by a tipping hot disintegration process, which belongs to the technical field of steel slag treatment and comprises a tipping deslagging stage and a hot disintegration stage. The tipping slag pouring stage comprises the steps that liquid molten steel slag and semi-solid steel slag in a steelmaking workshop are conveyed to a steel slag hot disintegration treatment workshop and mixed in a slag bed after being poured through a tipping car, a dust collection cover is arranged above the slag bed, and a closed space is formed by the dust collection cover and the slag bed; the hot disintegration stage comprises the following steps: starting a spraying facility arranged around a slag bed, spraying cold water by the spraying facility to cool various mixed steel slag, carrying out pulverization reaction on the steel slag when the steel slag meets the cold water, and repeatedly spraying the cold water until the steel slag is stable after being pulverized; the device and the method have the advantages that the device and the method are suitable for various enterprises with different steel slag yields and various steel slag types, the steel slag treatment efficiency is guaranteed, and the environment-friendly requirement is met.

The invention discloses a steelmaking continuous casting cutting torch with good cooling effect on the cutting nozzle, high cutting quality, fast cutting speed, low energy consumption, long service life, simple structure and small volume. It includes a torch body with an air distribution seat, a cutting nozzle located in the air distribution seat, and a water jacket on the outer wall of the air distribution seat. The cutting nozzle includes a core rod, a core seat connected with the core rod and its surrounding wall The core head is provided with several grooves, and the nozzle core sleeve is matched with the core head veneer. The core head is composed of a cylindrical section and a circular platform section. Several gas holes and preheating oxygen holes are respectively provided on the core seat, corresponding to several gas mixing holes connected to the corresponding gas holes and preheating oxygen holes. There is a high pressure oxygen hole composed of a frustum-shaped converging section, a cylindrical expansion section and an accelerating section.