15 results about "Continuous casting" 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 relates to a production method of welding rod steel H08A and belongs to the technical field of ferrous metallurgy. The technical problems to be solved are that the continuous casting time is short in the production process of the welding rod steel H08A and a casting billet has obvious air bubble defects. According to the technical scheme, the production method of the welding rod steel H08A comprises steps of rotary furnace smelting, LF refining and continuous casting, wherein in the LF refining, a refining slag adjusting agent with principal components being Al, Al2O3 and CaO isadded for diffusion deoxidation, the degree of activity of oxygen in molten steel is controlled at 0.0020-0.0040%, the content of Als is 0.001-0.005%, silicoferrite is added with the content of Si controlled at 0.02-0.03%, and then calcium treatment is carried out. By establishing a reasonable molten steel control system, welding rod steel H08A continuous casting billets without internal defectscan be stably and continuously produced.

The invention belongs to the technical field of refractory materials, and mainly provides a preparation method of a low-carbon aluminum-carbon refractory material for use in continuous casting. Polyborosilazane is taken as an additive, so that the high-temperature strength, oxidation resistance and erosion resistance of the low-carbon aluminum-carbon refractory material are improved; phenolic resin is taken as a bonding agent, and the adding amount of the phenolic resin is 4-6 percent by weight based on the total weight of the raw materials of the low-carbon aluminum-carbon refractory material; polyborosilazane is added into phenolic resin, and the adding amount of polyborosilazane is 3-7 percent by mass of phenolic resin. By adopting the method, the high-temperature strength, oxidation resistance and slag erosion resistance of a continuous cast low-carbon refractory material can be improved remarkably.

The invention provides a method for relieving pattern segregation of spring steel. The method for relieving pattern segregation of the spring steel comprises the following steps of (1) conventional smelting and control over the temperature of an upper continuous casting platform; (2) the process of two-time fire cogging of a square billet with the dimension being 185*185 mm; and (3) the process of high-speed rolling for steel products the diameter of 14 mm, wherein the heating temperature is 1020-1150 DEG C, the temperature of a soaking zone is 1020-1080 DEG C, and the temperature difference between an upper fracture surface and a lower fracture surface is smaller than or equal to 15 DEG C; the time in the furnace is 120-150 min, the start rolling temperature is 930-960 DEG C, the inlet temperature of a finishing mill is 870-900 DEG C, the inlet temperature of a reducing sizing mill is 830-850 DEG C, the finish rolling temperature is 820-850 DEG C, the outlet speed for pre-finishing is not greater than 8 m/s, and the largest roller speed of a Stelmor controlled cooling line is not greater than 33 m/s; and a 1# fan, a 2# fan are opened by 35%, and other fans and a heat preservation cover are completely opened. Compared with the prior art, by adoption of the method, the problem that pattern segregation exceeds the standard, and consequentially judgment amending is caused can be completely solved, and the production cost is greatly reduced.

The invention provides the high-strength 23Mn2CrNiMnVERA steel for railway train connection and a preparation method thereof. The 23Mn2CrNiMnVERA steel comprises the following components of carbon, silicon, manganese, vanadium, aluminum, chromium, molybdenum, nickel, cerium, copper, phosphorus, sulfur, Fe and non-removable impurities; the preparation method comprises the steps of molten iron pretreatment, converter smelting, LF refining, VD vacuum refining and continuous casting tapping. The high-strength 23Mn2CrNiMoVREA steel for connection has the advantages of being easy to weld, high in tensile property and high in yield strength at low temperature (-60 DEG C); and the preparation method of the high-strength 23Mn2CrNiMnVERA steel for the railway train connection has the advantages of being easy to control in the process and suitable for popularization.

The invention provides a pouring stream protecting device for pouring molten steel through a large ladle in continuous casting. The pouring stream protecting device comprises a shell and a channel, wherein the channel is located in the shell and penetrates through the shell, and ladle filler sand and the molten steel can pass through the channel. The channel comprises a connector part, a narrow straight barrel part and a wide straight barrel part, wherein the connector part is used for being matched with an upper nozzle of the large ladle for sealing, and the upper nozzle of the large ladle is sleeved with the connector part; one end of the narrow straight barrel part is communicated with the connector part, and the inner diameter of the narrow straight barrel part is smaller than that of the connector part; the wide straight barrel part is communicated with the other end of the narrow straight barrel part, and the inner diameter of the wide straight barrel part is larger than that of the narrow straight barrel part. Through the pouring stream protecting device, the nature of large-ladle pouring protection can be improved, and the large-ladle pouring protection effect is prominent; besides, the pouring stream protecting device is easy to mount, convenient to use and high in operability.

The invention relates to a continuous casting molding machine of rotary castings. The continuous casting molding machine is composed of a distribution box positioning section, a die assembly sending section, rotation mould bases and portal frames, wherein the distribution box positioning section and the die assembly sending section are in mirror symmetry, the two symmetrical rotation mould bases are fixedly installed at an intermediate shaft portion between the distribution box positioning section and the die assembly sending section, and the portal frames are fixedly installed on two sides of the position between the rotation mould bases and the die assembly sending section. The continuous casting molding machine is high in intelligentization degrees and production efficiencies, uniform in processed product shapes, wide in application ranges, good in application prospects, high in degrees of intelligence and automation and capable of manufacturing various rotary castings and effectively guaranteeing qualities of rotary civilian castings.

The invention discloses a large-plate-blank carbon-free and silicon-free baking-free long water gap, which consists of a long water gap substrate and an inner liner, wherein the long water gap substrate consists of a zirconium carbon outer layer and an aluminum carbon inner layer, the zirconium carbon outer layer consists of following substances in parts by weight: 70 to 80 parts of zirconium, 12 to 14 parts of C (carbon) and 2 to 4 parts of CaO (calcium oxide), the aluminum carbon inner layer consists of the following substances in parts by weight: 60 to 80 parts of Al2O3 (aluminum oxide) and 10 to 30 parts of C, and the inner liner consists of the following ingredients in parts by weight: 74 to 76 parts of aluminum magnesium spinel, 14 to 16 parts of anti-explosion fiber and 8 to 10 parts of phenolic resin. Through the use of the baking-free long water gap for large-plate-blank continuous casing low-carbon and low-silicon steel, impurity pollution and steel blank carbon increase and silicon increase phenomena caused by secondary oxidization of large-ladle molten steel and molten steel sputtering can be prevented, the continuous casting efficiency can be continuously improved, the continuous casting blank quality is ensured, and more economic benefits are created for enterprises.

The invention discloses a production method of a large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate, comprising the steps of smelting and continuous casting, heating, rolling, cooling, and straightening; in the step of smelting and continuous casting, a casting blank from the continuous casting comprises, by weight, 0.03-0.07% of C, </=0.10% of Si, 1.5-1.7% of Mn, </=0.015% of P, </=0.002% of S, 0.015-0.045% of Als, 0.20-0.30% of Cr, 0.055-0.070% of Nb, 0.010-0.030% of Ti, and the balance of Fe and unavoidable impurities. A large-wall-thickness pipeline steel base product produced via the method has uniform mechanical properties at 0/4, 2/4 and 4/4 along its thickness in directions perpendicular to and parallel to the rolling direction, with small differences in metallographic structure type and grain size; after production, a difference between maximum diameter and minium diameter of end ports of a steel pipe is 0.1-1.2 mm, end roundness deviations of the steel pipe range from 0.5 mm to 4.5 mm, and roundness index is increased by 55-70%. The large-wall-thickness straight-seam submerged-arc-welded pipeline steel plate produced via the method has the advantages such as high uniformity of mechanical properties, and small roundness deviation and high index after subsequent pipe forming.

It is intended to carry out continuous casting of zinc into a rod form under most suitable temperature condition. Zinc casting apparatus (2) comprises vessel (10) to be filled with molten zinc (L); opening (31) passing through the vessel (10) at an inferior position of the vessel (10); and mold part (11) for cooling of the molten zinc (L) to the solidification temperature or below, disposed outside the vessel (10) so as to communicate with the opening (31). Further, sleeve (45) made of a first heat insulation material and sleeve (46) made of a second heat insulation material are disposed in sequence from the side of the vessel (10) between the opening (31) and the mold part (11).

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.