31results about How to "Easy to segregate" patented technology

The invention discloses hot rolling container steel without a punctiform surface defect, which is characterized in that the hot rolling container steel is manufactured from the following elements in percentage by weight: 0.05-0.20 of C, 0.05-1.00 of Si, 0.2-2.0 of Mn, 0.05-0.20 of P, 0.05-0.60 of Cu, 0.20-0.80 of Cr, 0-0.60 of Ni, no more than 0.010 of S, 0.015-0.060 of Als, no more than 0.020 percent of Sn, no more than 0.020 percent of As, and the remaining is iron and non-avoidable residue. The manufacturing method of the hot rolling container steel is as following: firstly, the raw material steel plate base of the hot rolling container steel is obtained by desulfurization, converting and blowing, and continuous casting of molten iron, and then heating, rough rolling after scaling, primary rolling, refine rolling, laminar flow cooling and coil treating are carried out on the raw material steel plate base. The problems that container steel generates punctiform and salix-leaf-shaped defects on the surface after being heated in a heating furnace for 180 minutes or after being heated in a normal heating condition for 60-180 minutes are solved by the manufacturing method disclosed by the invention.

The invention relates to a high-entropy alloy coating resistant to high-temperature abrasion and a preparation process and application thereof. The preparation process comprises the following steps: (1) the surface of a titanium alloy sample is polished and washed; (2) metal powder, a ceramic hard phase and rare earth oxide are evenly mixed, and cladding material powder is formed to be flatly laidon the washed surface of a titanium alloy; and (3) the titanium alloy coating is prepared through laser cladding, wherein the metal powder includes Ti, Ni, Al, Si and V, a ceramic phase material is B4C or TiC or TiN, and the rare earth oxide is Y2O3. According to the high-entropy alloy coating, the hardness of a titanium alloy part can be remarkably improved, abrasion resistance of the titanium alloy part is improved, and the using range of the titanium alloy part is enlarged.

The invention discloses a method and device for preparing a high-strength and high-conductivity copper-carbon nano-tube composite material under a magnetic field. A dispersing agent is added to enable a bilayer structure to be formed on a carbon nano-tube particle surface, an outer-layer dispersing agent polar end and a plating solution have the higher affinity, the wetting degree of carbon nano-tube particles by the plating solution is improved, and uniform dispersion distribution of the particles is facilitated; in the plating process, the exerted magnetic field and an electric field interact to generate the magnetohydrodynamic effect caused by Lorentz force, so that the mass transfer effect of the planting solution is enhanced, and the uniformity of the plating solution is improved; the nano-tube particles are stretched in the axial direction under the effect of the Lorentz force, and are orderly arranged in an orientation manner under the effect of the magnetic field; meanwhile, adhesive force between the composite electrodeposition nano-tube particles and a metal belt base plate is increased due to the effect of the magnetic field, and compactness and stability of a copper-carbon nano-tube composite plating layer are improved; and due to the fact that the phenomenon that copper ions are wrapped with a nano-tube exists, the contact resistance between the nano-tube and a metal base plate is reduced, and therefore the conductivity of the copper-carbon nano-tube composite material is effectively improved.

The invention provides a hot delivery and hot charging production method of micro-alloyed steel. The micro-alloyed steel comprises the component of Fe, and further comprises C, Si, Mn, P, S, Al, Nb, Ti, Cr, Mo, Ni, Cu, B, N, O, and unavoidable impurity elements, wherein O is less than or equal to 0.002%, Nb is less than or equal to 0.11%, Ti is 0.08%-0.020%, and Ti / N is greater than or equal to 3.4, B is 0.001%-0.004%. The hot delivery and hot charging technology comprises the following steps that (1)when a continuous casting slab is subjected to straightening, surface temperature is 850-950 DEG C, and when hot delivery and hot charging are carried out, the surface temperature is 500-850 DEG C; a casting blank is preferentially and directly sent and delivered by using a roller way, or after number spraying is carried out, the casting blank is lifted off a line, but not stacked, and then delivered onto a furnace after natural cooling; (2)and during the heating process, the temperature of a preheating section hearth is greater than the surface temperature of the casting blank when the casting blank is subjected to hot delivery and hot charging. The hot delivery and hot charging production method of the micro-alloyed steel effectively avoids the star shake of steel plate surface caused by hot delivery and hot charging at two phase regions of micro-alloyed steel continuous castingslab, so that the industrial production of the micro-alloyed steel by hot delivery and hot delivery is possible, the production cost is reduced, and the hot delivery and hot charging technology is simple.

The invention discloses a bismuth-containing free-cutting pre-hardened plastic mold steel and a preparation method thereof. The chemical composition of the mold steel is as follows according to mass percentage: C: 0.32-0.40%, Si: 0.15-0.30%, Mn: 1.50-1.70 %, Cr: 1.70~2.00%, Ni: 0.85~1.15%, Mo: 0.25~0.40%, P≤0.015%, S≤0.005%, V: 0.05~0.10%, Bi: 0.05~0.15%, and the balance is Fe; its preparation method includes: smelting and casting into ingots according to the set chemical composition, forging the ingots into forging billets after high-temperature homogenization treatment, performing offline normalizing treatment to refine grains after forging, and finally undergoing quenching and tempering heat treatment, A uniform structure with a hardness of 32-48HRC is obtained. The bismuth-containing easy-cutting pre-hardened plastic mold steel of the present invention, through reasonable chemical composition design, adds bismuth element to replace the traditional easy-cutting elements sulfur and lead. It solves the thermal embrittlement phenomenon and the anisotropy caused by sulfur, and at the same time solves the problem that lead is harmful to the human body and pollutes the environment.

The invention discloses a preparation method of a silver tin oxide electrical contact material, which comprises the following steps: (1) putting raw materials into a smelting furnace for smelting, and atomizing with water to obtain alloy powder; (2) putting the alloy powder into Drying in a microwave oven, and then oxidizing the alloy powder in a microwave oven to obtain an oxidized alloy powder; (3) The oxidized alloy powder is made into an ingot; (4) The ingot is sintered in an oxygen pressure atmosphere to obtain a sintered ingot (5) The sintered ingot is pressed into wire, the wire is used for cold heading rivet contact, the sheet is rolled and punched to produce sheet contact, and silver tin oxide electrical contact material is obtained. The silver tin oxide electrical contact material prepared by the invention has low arc energy, long electrical life, simple designed process route, high material utilization rate and short production cycle, is suitable for large-scale production, and can be vigorously popularized and applied.

The invention discloses a high-toughness and low-yield-ratio quenched and tempered steel plate used in a low-temperature environment. The high-toughness and low-yield-ratio quenched and tempered steel plate comprises, by weight, 0.045-0.068% of C, 0.13-0.25% of Si, 1.55-1.74% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.0015% of S, 0.25-0.33% of Cr, 0.14-0.21% of Cu, 0.18-0.25% of Ni, 0.035-0.044% of Nb, 0.033-0.049% of V, 0.010-0.016% of Ti and the balance Fe and inevitable impurities. The invention further discloses a manufacturing method of the high-toughness and low-yield-ratio quenched and tempered steel plate used in the low-temperature environment. A proper number of alloy elements such as Cu, Cr and Ni are added to the steel plate on the basis of a low-C and high-Mn system, and Nb, V and Ti are adopted for microalloying. Due to a pass reduction schedule and an offline heat treatment regime in the hot rolling process are optimized, quenched and tempered type pipeline steel which is high in low-temperature-environment toughness and low in yield ratio and is used for a straight seam welded pipe is finally obtained.