56results about How to "Improve cold working performance" patented technology

The invention provides a non-vacuum melting horizontal continuous casting production technology for a high-strength high-conductivity Cu-Cr-Zr alloy rod and belongs to the technical field of metallic material preparation and processing. According to the horizontal continuous casting production technology provided by the invention, the measures, such as, atmosphere protection and addition of a covering agent and a refining agent, are taken in a non-vacuum melting furnace, so that the problem of easy oxidization of molten Cu-Cr-Zr can be effectively solved and the problems of high equipment cost and limited melting capacity brought by a conventional vacuum furnace can be solved. Besides, the application of the horizontal continuous casting production technology provided by the invention for producing the Cu-Cr-Zr alloy rod is favorable for discharging impurities and solidified separated gas in the molten alloy into a liquid phase and promoting the rod tissue compactness; high-axial oriented columnar crystals can be acquired, and the subsequent cold processing performance of the alloy rod can be promoted; and the production technology can realize the high-quality continuous casting for the high-strength high-conductivity copper alloy rod characterized by heavy weight and long size and having easily oxidized and segregated elements.

The invention relates to a heat-resistant aluminum-alloy conductor material for cables and a manufacture method thereof. The aluminum-alloy conductor material is prepared from the following components in percentage by weight: 0.3-1.0 percent of Fe, 0.01-0.3 percent of Cu, 0.01-0.3 percent of Mg, 0.01-0.3 percent of one, two or three of Mg, Ca, Mo and Sb and 0.05-0.8 percent of one or more rear-earth elements of Sc, Y and Er, not larger than 0.1 percent of Si, not larger than 0.15 percent of other impurities and the balance of Al. The aluminum-alloy conductor material has excellent conductivity, tensile performance, flexible performance and excellent heat resistance, can be used as insulated cable cores of wires and cables and is particularly suitable for overhead insulated conductor wire cores.

The invention provides a chemical conversion film on the surface of a magnetism alloy and a preparation method thereof. Rare earth cerium ions are injected in the surface of the magnesium alloy in anion injecting mode to form anchoring points so as to improve the adaptation between a conversion film layer and the surface of the magnesium alloy; meanwhile, a surface treating agent with metallic oxysalt and sulfydryl-contained silane as a film forming agent is applied to the surface of the magnesium alloy; the type and the components of the surface treating agent are screened; the treatment process is improved to finally prepare the conversion film layer with high compactness and excellent corrosion resistance; and the conversion film layer can achieve excellent lubricity, alkali resistanceand coating property in subsequent cold working.

The invention discloses an electrode wire used for slow feed electric spark corrosion processing and a preparation method thereof. The electrode wire comprises the following components by weight percentage: 51%-59.5% of Cu, 40%-48% of Zn, 0.1%-4.0% of M1, 0.002%-0.2% M2 and the remaining part consists of unavoidable impurities brought in by raw materials; wherein, M1 comprises two optional metalsselected from Mn, Sn, Al and Mg and content ranges of the two metals are both 0.05%-2.0% in the electrode wire; M2 comprises two optional metals selected from Zr, La, Ce, B, Fe and content ranges of the two metals are both 0.001%-0.1% in the electrode wire. The preparation manner adopts a shock chilling method which can refine the micro-structure of the electrode wire. The invention is characterized in that the method has simple preparation process and low product cost and effectively enhances electric spark corrosion processing speed of the electrode wire, thereby having strong market competitiveness.

The invention relates to a method for producing hot rolled steel coils. The method comprises the following steps: 1) designing the components, pretreating molten iron, then carrying out converter smelting, carrying out nitrogen / argon changing over and carrying out tapping to obtain molten steel; 2) continuously casting the molten steel to obtain slabs, controlling the weight of the molten steel in the tundish to be 8-15t when casting of the continuous casting tundish is stopped, ensuring the liquid level to be 200-350mm; carrying out protective casting in the whole course and ensuring the insertion depth of the long nozzle to be 300-400mm; 3) heating the slabs; and 4) finally rolling and curling the heated slabs, thus obtaining the hot rolled steel coils. The method has the following beneficial effects: the TMCP (thermo-mechanical control process)+RPC (relaxation-precipitation-controlling phase transformation) rolling processes are adopted and the contents of C and Mn are substantially reduced by utilizing micro-niobium treatment, thus reducing the production cost; and the Q345R hot rolled steel coils obtained by the method have excellent plasticity and toughness, the elongation of the hot rolled steel coils is improved by more than 8%, and at the same time, the welding property of the materials is improved and good surface quality of the continuous casting slabs is ensured.

The invention provides a method for manufacturing a high-nitrogen, low-nickel, copper-free austenitic stainless steel. The components of the high-nitrogen, low-nickel, copper-free austenitic stainless steel are: C: 0.12-0.16%wt%, Si: 0.40- 0.50%wt%, Mn: 8.0~10.0%wt%, P: ≤0.045%wt%, S≤0.005%wt%, Cr: 14.5~15.0%wt%, Ni: 1.0~1.3%wt%, N: 0.18 ~0.20%, the rest is Fe and unavoidable impurity elements. The present invention solves the problem of serious transformation hardening degree of nickel-saving austenite cold-worked martensite while reducing the production cost of the enterprise, optimizes the cold-working performance of the product and improves the limit reduction ratio of the first cold rolling, and reduces the risk of cold-rolling cracking quality and economical efficiency. loss.

The invention relates to a high-iron cupronickel alloy pipe and a short-process production method thereof, and belongs to the technical field of metal materials. Compared with a BFe10-1-1 alloy, the cupronickel alloy BFe10-2-1 provided by the invention is increased in alloy iron element content from 1.0wt%-1.5wt% to 1.6wt%-2.5wt%, thereby greatly enhancing the corrosion-resistant property and mechanical property of the alloy. According to the short-process production method, a pipe billet with high inner-outer surface quality and high-axial orientation columnar crystal structure is prepared by adopting a heat-cold combined casting horizontal continuous casting technology, so that the cold machining property of high-iron cupronickel is greatly enhanced; the continuous casting pipe billet is directly subjected to cold rolling and / or cold-draw forming, a pipe is subjected to finished product annealing by adopting a proper annealing schedule to eliminate microsegregation, the average size of a recrystallized grain is controlled to 20-40 micrometers, the volume fraction of a precipitated phase is reduced to be less than 2%, so that the cupronickel pipe with excellent mechanical property and corrosion-resistant property is obtained. Compared with a BFe10-1-1 pipe produced through the traditional method, the BFe10-2-1 high-iron cupronickel pipe disclosed by the invention has the advantages of more excellent integral using property, short production process and high production efficiency and finished product rate.

The invention provides a high-nitrogen, low-nickel, copper-free austenitic stainless steel. The components are: C: 0.12-0.16%wt%, Si: 0.40-0.50%wt%, Mn: 8.0-10.0%wt%. , P: ≤0.045%wt%, S≤0.005%wt%, Cr: 14.5-15.0%wt%, Ni: 1.0-1.3%wt%, N: 0.18-0.20%, and the rest are Fe and unavoidable impurity elements. The present invention solves the problem of serious transformation hardening degree of nickel-saving austenite cold-worked martensite while reducing the production cost of the enterprise, optimizes the cold-working performance of the product and improves the limit reduction rate of the first cold rolling, and reduces the risk of cold-rolled cracking quality and economical efficiency. loss.

The invention discloses Mo-containing ferritic stainless steel, which comprises the following chemical elements in percentage by mass: less than or equal to 0.025 percent of C, less than or equal to 0.025 percent of N, less than or equal to 1.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, more than 20.0 percent and less than or equal to 22.0 percent of Cr, more than 0 percent and less than or equal to 1.0 percent, less than or equal to 1.3 percent of (Ni+Cu), more than or equal to 0.5 percent and lessthan or equal to 1.2 percent of Mo, more than or equal to 10(C+N) and less than or equal to 0.8 percent of (Ti+Nb), less than or equal to 0.015 percent of O, and the balance of Fe and other inevitable impurities. Correspondingly, the invention also discloses a manufacturing method for the steel. Compared with the conventional SUS444 and SUS436L steel, the Mo-containing ferritic stainless steel has the advantages of greatly reducing manufacturing cost, maintaining pitting corrosion resistance and chlorine-ion stress corrosion resistance, and being suitable for water system medium environments.

The invention relates to a method for producing a hot rolled steel coil. The method comprises the following steps of: 1) designing components, pretreating molten iron, smelting in a converter, switching between nitrogen and argon, and performing tapping to obtain molten steel; 2) performing continuous casting on the molten steel to obtain a plate blank, controlling tundish molten steel amount to be between 8t and 15t and liquid level to be between 200mm and 350mm when a continuous casting tundish stops pouring, and pouring under protection in the entire process, wherein the length of an inserted part of a long nozzle is between 300mm and 400mm; 3) heating the plate blank; and 4) finally rolling the heated plate blank and winding to obtain the hot rolled steel coil. In the method, a thermomechanical control process (TMCP) and a relaxation-precipitation-control (RPC) rolling process are adopted, and C content and Mn content are greatly reduced by micro niobium treatment, so that production cost is reduced; the Q345q-E hot rolled steel coil produced by the method has high plasticity and toughness, and the elongation rate of the hot rolled steel coil is improved by more than 8 percent; meanwhile, the welding properties of materials are improved, and high surface quality of a continuous casting blank is guaranteed.