63results about How to "Reduce the difficulty of smelting" patented technology

Eutectic cermet materials include at least two carbides and a refractory metal, wherein the carbide is selected from the group of TiC, VC, ZrC, HfC, WC, NbC and TaC, and the refractory metal is tungsten. The disclosed eutectic cermet material prepared is by smelting the carbide and the refractory metal together at a temperature lower than melting temperatures of the carbide and the refractory material. The melting temperature lowered by forming a eutectic composition is to prepare the eutectic cermet materials having a fine lamellar structure. The prepared eutectic cermet materials improve hardness and toughness at use.

The invention provides non-magnetic stainless steel with high strength and toughness, a manufacturing method and application thereof. The stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.04 percent of C, 0.35 to 0.65 percent of Si, 17.00 to 22.00 percent of Mn, 13.00 to 17.00 percent of Cr, 0.30 to 0.50 percent of Mo, 0.15 to 0.45 percent of Ni, 0.30 to 0.80 percent of N, less than or equal to 0.03 percent of P, less than or equal to 0.005 percent of S, and the balance being Fe and inevitable impurities. The steel improves the rust resistance and corrosion resistance of the stainless steel by adopting a low-carbon and high-chromium content design, reduces the nickel content by replacing the nickel with manganese and nitrogen at the same time, and reduces production cost. The steel is smelted by adopting an EAF, AOD and LF method, the forging process is divided into two temperature stages, the steel is treated by adopting different deformation amounts, and the method is simple and convenient to apply and has good effect. The invention also provides application of the stainless steel in a petroleum drill.

The invention discloses a cake-shaped crystal grain deep-draw double-phase steel plate and a preparation method thereof, belonging to the field of a metal material rolling technology. The cake-shaped crystal grain deep-draw double-phase steel plate comprises the chemical components by weight percent: 0.01-0.05% of C, 0.1-0.4% of Si, 1.2-1.7% of Mn, 0.1-0.4% of Cr, 0.03-0.07% of Als, 0.003-0.006% of N, less than or equal to 0.02% of P, less than or equal to 0.01% of S and the balance of Fe and unavoidable trace impurities. The preparation method of the steel plate comprises the steps of firstly, smelting raw material and refining the raw material in a heating steel ladle; casting the refined raw material into a plate blank by continuous casting, and then carrying out hot rolling on the plate blank; carrying out acid pickling and then rolling the plate blank into a sheet by cold rolling; carrying out cover annealing, cooling to the room temperature and then carrying out continuous annealing; finally, carrying out overaging treatment and cooling the product to the room temperature to obtain the cake-shaped crystal grain deep-draw double-phase steel plate. Compared with a piece of equiaxed grain double-phase steel with the same performances, the cake-shaped crystal grain deep-draw double-phase steel plate has better stamping forming property. Compared with the existing deep-draw double-phase steel, the cake-shaped crystal grain deep-draw double-phase steel plate is low in production cost, higher in practicability and better in plate shape and surface quality.

The invention relates to a smelting furnace and a smelting method for extracting valuable metals from laterite-nickel ore. The smelting furnace comprises a furnace body with a furnace chamber, the furnace body is sequentially divided into a hearth section, a furnace body section and a furnace top section from bottom to top; the bottom side of the hearth section is in communication with an electricheating fore well, the electric heating fore well is provided with a deslagging port and a siphon port, the position of the inner end of the siphon port is lower than the position of the inner end ofthe deslagging port, and the bottom area of an inner cavity of the electric heating fore well is 1 / 2-3 / 2 of the bottom area of an inner cavity of the hearth section; the inner bottom face of the hearth section inclines in the direction where the electric heating fore well is located, and the included angle between the inner bottom face of the hearth section and the horizontal plane is 5degrees-20degrees. After the laterite-nickel ore, the additive, the flux and the like are mixed, the mixture can be directly smelted in a smelting furnace, pelletizing treatment is not needed, and the smeltingprocess is simplified. The smelting furnace can be used for carrying out direct, efficient and low-energy-consumption oxygen-enriched smelting on the low-grade laterite-nickel ore to generate nickelmatte, nickel matte and the like with economic values.

The invention discloses an axle housing steel for cold stamping with a thickness of 590 MPa and a preparation method thereof, and belongs to the technical field of hot continuous rolling strip production. 590MPa grade axle housing steel for cold stamping, its chemical composition is: C0.07‑0.10%, Si0.05‑0.10%, Mn1.50‑1.60%, P≤0.020%, S≤0.008%, Nb0. 030‑0.040%, V0.07‑0.10%, N0.010‑0.015%, Als 0.015‑0.050%, and the balance is Fe and inevitable impurities. The preparation method is as follows: smelting into slabs according to the chemical composition of the axle housing steel for cold stamping with a thickness of 590 MPa, and sequentially heating the slabs, rough rolling, finishing rolling, coiling and cooling, to obtain a slab for cold stamping with a thickness of 590 MPa. Axle steel. The product of the invention has yield strength ≥460MPa, tensile strength ≥590MPa, elongation after fracture ≥20%, full-size-40°C impact energy KV2 ≥80J, and can effectively solve the problem of high production cost of existing high-strength axle housing steel .

This invention discloses a biomedical titanium alloy and a preparation method thereof. The titanium alloy contains three elements of Ti, Nb and O, and the composition includes 31-39wt% Nb, 0.4-0.8wt% O and the balance of Ti and other components. Inevitable impurities; through heat treatment, the content of α-phase in the alloy structure is finally controlled to be no more than 15%, and the Nb content of β-phase is 38-40%; the elastic modulus of the alloy is 50-65GPa, and the tensile strength is above 900MPa. The low-modulus and high-strength titanium alloy of the invention has high oxygen content, can reduce the cost of deoxygenation in the smelting preparation process, has excellent mechanical properties, and has important theoretical significance and engineering value.

The invention relates to a smelting method of medium carbon stainless steel. The method includes steps of electric furnace smelting and refining and vacuum processing. During the electric furnace smelting, the tapping P is controlled not larger than 0.015 percent; the electric furnace outputs the steel without slag; the temperature of a large ladle is controlled between 1580 DEG C and 1630 DEG C;the ladle is excellent in argon blowing; after a stationary ladle is refined, the temperature of the molten steel is raised simultaneously when deoxidation and the temperature is controlled between 1580 DEG C and 1650 DEG C; ferrochrome iron is added by 4 to 6 batches; during the refining process, large argon blowing is carried out until the alloy is completely smelt and uniformed, the other components are adjusted to the target values; the slag amount is enlarged during refining, white slag is maintained; then the medium carbon stainless steel is obtained through post treatment. In the method, the chromium recycling rate of the molten steel can reach more than 97 percent; the [P] content of the molten steel is controlled within 0.015 percent. Simultaneously the method is simply operated,convenient and practical, reduces the smelting difficulty, shortening the smelting period and reducing the production cost; besides, the method has a certain reference meaning to the smelting of a plurality of steel with high alloy.

The invention relates to a method for eliminating an edge fault of aluminium killed steel with low manganese-sulfur ratio and low carbon, belonging to the technical field of steel rolling. The method comprises the following technological steps of: cooling an offline plate blank in an insulating pit, or slowly cooling by stacking; controlling the atmosphere in a heating furnace and the residence time in each stage, the temperature and the total residence time in the furnace of the plate blank; rolling in an equivalent width mode or widening mode; and adjusting a scale removing mode and a layercooling mode. The invention has the advantage of eliminating the influence of Mn / S on the quality of steel edges by optimizing heating and rolling technologies under the premise of not increasing extra equipment and investment. Compared with the prior art for eliminating the influence of Mn / S on the quality of band steel edges by increasing the content of Mn or reducing the content of S in the plate blank, the invention can greatly reduce production cost and smelting difficulty. The method is economical and effective, meets the requirements of low carbon and economy of green steel, and is especially applicable to the production of low-carbon aluminium killed steel with 10-30 Mn / S.

The invention provides cold-rolled low-alloy high-strength air-cooled strengthened steel for an automobile and a preparation method, and belongs to the technical field of alloy steel preparation. Thestrengthened steel comprises, by mass percent, 0.05%-0.15% of C, 1.0%-2.0% of Mn, 0.05%-0.25% of Si, 0.20%-1.0% of Cr, 0.05%-0.3% of Mo, 0.01%-0.06% of Al, 0.01%-0.10% of Nb, 0.01%-0.10% of V, 0.01%-0.10% of Ti, 0.001%-0.006% of B, smaller than 0.03% of P, smaller than 0.03% of S and the balance Fe and unavoidable impurities. The strengthened steel is obtained through the steps that after raw material preparing, smelting and pouring are conducted to obtain a plate blank, the plate blank is heated, multiple passes of hot rolling deformation is conducted after homogenization treatment is conducted, air cooling is conducted till the temperature reaches rolling temperature, rolling is conducted till the temperature reaches the room temperature, cold rolling is conducted after acid pickling, and finally annealing treatment is conducted. The obtained cold-rolled annealing plate has the yield strength of being lower than 350 MPa and the tensile strength of being lower than 500 MPa, has the good cold forming performance and can be machined into complex automobile parts.