34results about How to "No occurrence" patented technology

This invention relates to nanoscale silicate anti-oxidation coating for steel billet annealing. The coating is composed of: composite binder 20-30 wt.%, composite phosphate curing agent 8-12 wt.%, and composite aluminosilicate filler 58-72 wt.%. The coating can resist 1500 deg.C high temperature. The coating does not need any surface treatment, and can be directly sprayed onto the surface of steel billet, and cured at normal temperature for 10 min. Before annealed and hot-rolled, the coated steel billet is water-quenched for several seconds so that the coating layer is removed without any trace, and the surface quality is improved. The coating can reduce the loss-on-ignition of various steels, thus can be used for surface protection of refractory materials used as furnace kiln lining. Besides, the coating can also be used as inner and outer wall coating, and metal surface (bridge, bridge pier and dam) coating with water, corrosion and oxidation resistance.

The invention discloses a preparation method of low-viscosity microcapsule-wrapped APP. The method comprises the steps as follows: in a reaction kettle, a melamine formaldehyde resin pre-polymer and APP are dispersed in a solvent; a curing agent solution is dripped; after dripping, a backflow reaction is performed for 0.5-5 h; the temperature is decreased to 40-50 DEG C; an end-sealing agent is dripped; after dripping, a heat preservation reaction is performed for 0.5-3 h; the mixture is cooled to a room temperature; then the mixture is filtered, washed with a solved and pumped; a rake type drier is used; and the mixture is dried for 6-24 h under a pressure reduction condition, so that microcapsule-wrapped APP powder is obtained. Compared with un-wrapped APP, the microcapsule-wrapped polyphosphate powder has the characteristics of low viscosity and water solubility, excellent flowing property and compatibility, high-temperature soaking resistance, precipitation resistance, excellent electrical property and the like. The APP can be applied to high polymer materials such as polyolefin and the like and can also be applied to fabrics, epoxy and coatings.

The invention relates to a covering-type silt prevention cover plate of an immersed tunnel gravel foundation bed. The covering-type silt prevention cover plate of the immersed tunnel gravel foundation bed comprises a frame, wherein a plurality of ballast water tank bodies into which water can be filled and from which water can be drained are arranged in the frame, and lifting points are arranged on the frame. A plurality of canvas bags for containing silt are arranged above the ballast water tank bodies, a cover plate installation vessel comprises two floating bodies, the tops of the floating bodies are connected through a portal frame, lifting hooks are arranged on the portal frame, a lifting machine is arranged on the floating bodies, and desilting equipment is arranged on the cover plate installation vessel. By adopting the cover plate covering-type silt prevention scheme, the foundation bed can be fully covered, the complete isolation between the silt and the foundation bed is realized and the quality of the foundation bed is guaranteed; foreign objects falling onto the foundation bed during construction directly fall onto the cover plate and can be prevented from occurring on the foundation bed; since full-coverage silt prevention is adopted, the flattening operation of the foundation bed can be performed in advance and the construction progress is accelerated; no destruction is caused to the foundation bed and the integrity of the foundation bed is guaranteed.

The invention relates to Chinese wolfberry fruit powder and a preparation method thereof. The preparation method of the Chinese wolfberry fruit powder comprises the following steps of: (1) selecting fresh and matured Chinese wolfberry fruits or dried Chinese wolfberry fruits, spraying with water, and removing silt, pesticide residue and other residues attached to the surfaces of the Chinese wolfberry fruits; (2) directly drying and sterilizing the cleaned fresh (dried) Chinese wolfberry fruits by adopting tunnel microwave; and (3) immediately crushing the dried Chinese wolfberry fruits by using a pulverizer to obtain a Chinese wolfberry fruit product with particle size of 80-300 meshes. In the invention, drying and crushing operations are carried out at low temperature, so that the obtained products have favorable quality, maintain the original cluster and nutrients of the fresh Chinese wolfberry fruits and have high quality. Therefore, the Chinese wolfberry fruit powder has the efficacy of tonifying the kidney, protecting liver, improving eyesight, beautifying skin, strengthening brain, expelling toxin, reducing sugar and fat, preventing osteoporosis, nourishing blood vessels and skin, prolonging life and delaying ageing after being used for a long time, which are also endowed by Chinese wolfberry.

The invention discloses a high-strength antiseptic steel plate for a shuttle car shelf. The steel plate comprises the following components: 0.77-0.79% of C, 0.17-0.19% of Mn, 0.14-0.16% of Si, 0.006-0.008% of P, 0.002-0.004% of S, 0.083-0.085% of Nb, 0.03-0.05% of V, 0.86-0.89% of Ti, 0.53-0.57% of Al, N not more than 0.006%, H not more than 0.00020%, 0.17-0.19% of Cu, 4.7-4.9% of Cr, 0.13-0.15% of Mo, 0.11-0.013% of lanthanum, 0.06-0.08% of cerium, 0.02-0.04% of praseodymium, and the balance of Fe. The steel plate is strong in corrosion resistance, high in transverse yield strength and excellent in low-temperature toughness.

The invention discloses a medicament for treating breast cancer. The medicament comprises an orally-taken medicament and an externally-applied medicament, wherein the orally-taken medicament is prepared from the following material medicines: ginseng, prepared rehmannia root, lucid ganoderma, Chinese yam, schisandra chinensis, selfheal, oldenlandia diffusa, herba houttuyniae, brucea javanica, typhae pollen, cowherb seed, astragalus membranaceus, radix burpleuri, thunberg fritillary bulb, corydalis tuber, caulis spatholobi, caulis spatholobi, fruit of immature citron, edible tulip, curcuma zedoary, ligusticum wallichii, Chinese angelica, frankincense, herba leonuri, eclipta, citron peel and liquorice which are decocted in water; the externally-applied dug is prepared from the following material medicines: stiff silkworm, curcuma zedoary, ligusticum wallichii, Chinese angelica, thunberg fritillary bulb, platycodon grandiflorum, radix curcumae, turtle shell, achyranthes bidentata, caulis spatholobi, borneol, bee wax and sesame oil which are prepared into ointment. The effective rate for treating the breast cancer by the medicament disclosed by the invention is 100%.

The invention discloses a polyethylene glycol / hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material. The phase change material is prepared from polyethylene glycol (PEG),isocyanate (MDI) and hydroxypropyl cellulose (HPC) through a chemical grafting reaction. The phase change material is subjected to phase change at 80-120 DEG C, and after the temperature is kept for1-2 h, the stable solid state is still kept, and small molecule leakage is avoided; and the phase change process of the phase change material is solid-solid phase change, the phase change temperatureis 32-54 DEG C, the phase change enthalpy value is 99.5-130.8 J / g, and the thermal conductivity is 0.2494-0.5239 W / m. A preparation method of the phase change material comprises the following steps: (1) preparing an NCO-PEG prepolymer; 2) preparing a cross-linked polymer; and 3) preparing the composite phase change material. The preparation method has the following advantages: 1, the problem of leakage in the phase change process is solved; 2, the synthetic route is simple and has no pollution; 3, the phase change mateirla has good thermal energy storage characteristic and good thermal stability; and 4, the thermal conductivity of the phase change material is effectively improved, and the thermal conductivity is increased from 0.2494 W / m.K to 0.5239 W / m.K, and the utilization rate of heatis improved.

The invention relates to a high-strength anti-corrosive steel plate of a heavy-duty storage rack, which comprises the following components by mass percent: 0.45-0.49% of C, 0.27-0.29% of Mn, 2.8-3.9% of Cr, 0.18-0.21% of Si, 0.083-0.085% of Nb, 0.03-0.05% of V, 0.66-0.79% of Ti, 0.53-0.57% of Al, 0.09-0.15% of Cu, 0.13-0.15% of Mo, 0.035-0.043% of lanthanide rare earth, and the balance of Fe and inevitable impurities, wherein the lanthanide rare earth comprises the following components by mass percent: 4-11% of cerium, 5-10% of europium, 10-13% of terbium, 15-22% of gadolinium, 12-15% of praseodymium, 0-4% of holmium, 15-20% of erbium, and the balance of lanthanum. The steel plate has high corrosion resistance, high transverse yield strength and excellent low temperature toughness.

The invention discloses an anti-acid steel plate for steel structure work. The anti-acid steel plate for the steel structure work comprises, by weight, 0.27%-0.29% of C, 0.35%-0.37% of Mn, 0.17%-0.19% of Si, 0.006%-0.008% of P, 0.002%-0.005% of S, 0.03%-0.05% of Nb, 0.04%-0.06% of V, 0.15%-0.17% of Ti, 0.018%-0.019% of Al, equal and less than 0.06% of N, equal and less than 0.00020% of H, 0.022%-0.024% of Cu, 1.65%-1.67% of Ni, 0.54%-0.56% of Cr, 0.13%-0.15% of Mo, and the balance is Fe and inevitable impurities. The heating processing technology of normalizing-secondary normalizing-tempering is adopted to carry out heating processing, and the good toughness and the anti-acid property are provided.

The invention provides an anti-acid steel plate for storage equipment and a preparation method of the anti-acid steel plate. The steel plate is prepared from the following components in percentage by mass: 0.31-0.33% of C, 0.45-0.47% of Mn, 0.07-0.09% of Si, 0.006-0.008% of P, 0.002-0.005% of S, 0.06-0.08% of Nb, 0.07-0.09% of V, 0.05-0.07% of Ti, 0.08-0.1% of Al, less than or equal to 0.006% of N, less than or equal to 0.00020% of H, 0.012-0.015% of Cu, 0.4-0.6% of Cr, 0.23-0.25% of Mo and the balance of Fe. According to the anti-acid steel plate, a reasonable two-phase ratio as well as fine ferrite and dispersively distributed pearlite of the steel plate can be obtained and the formation of banded structure is avoided; and without the banded structure, the acid resistance is improved.

The invention discloses a method for controlling no soft strip at an end part of a roller body of a large forged steel support roller after quenching. The method comprises the following steps: (1) the length allowance of the roller body is controlled; (2) in the heating process, the surface temperature uniformity of the roller body is controlled within +-10 degrees; (3) the precooling is performed by 5-15 minutes after heating and before spraying cooling; and (4) a spraying cooling mode of uniformly spraying the surface of the large forged steel support roller by water mist formed by combined action of compressed air and compressed water is adopted; and the spraying covering length is greater than the total length of the roller body by 50-100 mm to guarantee the water mist to cover the whole roller body. In the quenching process of the large forged steel support roller, the large forged steel support roller obtained by the control method is better in roller body surface hardness and uniformity, and is free of soft strips.

The invention relates to a room temperature water solution growth type stannous selenium nanorod cone monocrystal and a method thereof. The method comprises the following steps of using stannous chloride as a stannous source, using selenium powder as a selenium source, and dissolving the stannous chloride and a chelating agent into water, so as to obtain a solution A; dissolving the selenium powder into a potassium hydroxide water solution, so as to obtain a solution B; mixing the solution A and the solution B to react, so as to obtain the stannous selenium nanorod cone monocrystal. The method has the advantages that by adopting a water solution method, the growth of the stannous selenium nanometer crystal is completed through three phases of nucleating, aging and crystal nuclear growth of the nanometer crystal, finally the stannous selenium nanorod cone monocrystal is obtained through separating, the reaction temperature is room temperature, the operation is simple, the reaction time is short, and the control is easy; the grown stannous selenium is in a nanorod cone shape and is nanometer monocrystal, the nanometer tip end is sharp, and the purity of the obtained stannous selenium nanorod cone monocrystal is high.

The invention discloses high-strength load-bearing steel for a storage rack. The steel plate comprises the following components by mass percent: 0.27-0.32% of C, 0.21-0.33% of Mn, 0.05-0.07% of Si, 0.006-0.008% of P, 0.002-0.004% of S, 0.09-0.11% of Nb, 0.04-0.06% of V, 0.36-0.39% of Ti, 0.05-0.07% of Al, N less than or equal to 0.006%, H less than or equal to 0.0002%, 0.17-0.19% of Cu, 1.7-1.9% of Cr, 0.33-0.35% of Mo, 0.02-0.04% of lanthanum, 0.01-0.02% of cerium, 0.05-0.07% of praseodymium, and the balance of Fe and unavoidable impurities. According to the high-strength load-bearing steel disclosed by the invention, the transverse yield strength of the steel plate is greater than or equal to 230 MPa, and the steel plate is high in strength and excellent in low-temperature toughness.

The invention discloses an anti-corrosion steel plate for a shelf heavy beam. The anti-corrosion steel plate is prepared from the following components: 0.7-0.9 percent of C, 0.1-0.3 percent of Mn, 0.07-0.09 percent of Si, 0.006-0.008 percent of P, 0.002-0.004 percent of S, 0.043-0.045 percent of Nb, 0.07-0.09 percent of V, 0.5-0.7 percent of Ti, 0.13-0.15 percent of Al, smaller than or equal to 0.006 percent of N, smaller than or equal to 0.00020 percent of H, 0.07-0.09 percent of Cu, 3.7-3.9 percent of Cr, 0.43-0.45 percent of Mo, 0.07-0.09 percent of lanthanum, 0.03-0.05 percent of cerium, 0.05-0.07 percent of praseodymium and the balance of Fe. The anti-corrosion steel plate is strong in corrosion resistance, high in plasticity and excellent in low-temperature toughness and has the transverse yield strength to be larger than or equal to 220 MPa.

The invention discloses a medicament for treating breast cancer. The medicament comprises an orally-taken medicament and an externally-applied medicament, wherein the orally-taken medicament is prepared from the following material medicines: ginseng, prepared rehmannia root, lucid ganoderma, Chinese yam, schisandra chinensis, selfheal, oldenlandia diffusa, herba houttuyniae, brucea javanica, typhae pollen, cowherb seed, astragalus membranaceus, radix burpleuri, thunberg fritillary bulb, corydalis tuber, caulis spatholobi, caulis spatholobi, fruit of immature citron, edible tulip, curcuma zedoary, ligusticum wallichii, Chinese angelica, frankincense, herba leonuri, eclipta, citron peel and liquorice which are decocted in water; the externally-applied dug is prepared from the following material medicines: stiff silkworm, curcuma zedoary, ligusticum wallichii, Chinese angelica, thunberg fritillary bulb, platycodon grandiflorum, radix curcumae, turtle shell, achyranthes bidentata, caulis spatholobi, borneol, bee wax and sesame oil which are prepared into ointment. The effective rate for treating the breast cancer by the medicament disclosed by the invention is 100%.

The invention relates to a preparation method of a raw material of a polished tile blank, and belongs to the technical field of construction material preparation. According to the preparation method, plants are subjected to hyper-accumulation to obtain mixed metal ions; maleic anhydride is used to modify the surface of organic bentonite; the obtained mixed metal ions is combined to the surface of the organic bentonite through the action of a silane coupling agent; then the organic bentonite is carbonized to increase the strength; finally, the aluminum content is increased by adding aluminum ash; the condensation polymerization between silane happens in a high temperature environment in the presence of quartz sand and aluminum ash; a three dimensional net structure of bonds is formed, the high temperature viscosity is increased, the sintering temperature is raised; the problem that conventional polish tiles usually have defects such as deformations, pores, cavities, and the like is solved; the sintering temperature of polished tile prepared from the provided raw material is 1050 to 1150 DEG C, the sintering temperature is largely reduced and enlarged, and at the same time, the prepared polished tile does not have the defects (deformations, pores, or cavities), and can be widely applied to industrial production.

The invention discloses a composite cross-linked structure reinforced sludge coagulation modifier. The composite cross-linked structure reinforced sludge coagulation modifier comprises, by mass, 100 parts of a structural material, 1-3 parts of a reinforcing agent, 15-20 parts of a dehydrating agent, 1-3 parts of a coagulation agent, 0.5-3.5 parts of an accelerant, 2-4 parts of a dispersing agent and 0.5-1 part of a biocide. The invention also discloses application of the composite cross-linked structure reinforced sludge coagulation modifier in sludge treatment. All the components have strictaddition and mixing sequences in the application, and the sludge treatment effect is seriously influenced by improper addition. The composite cross-linked structure reinforced sludge coagulation modifier provided by the invention has good sludge reinforcement and modification effects on sludge, is simple and convenient in application method, and easy to construct, has no secondary pollutants in the application process, has good application and popularization value, meets various application requirements of sludge recycling, and has important significance in green treatment and application of sludge.

The invention provides an anti-acid steel plate for storage equipment and a preparation method of the anti-acid steel plate. The steel plate is prepared from the following components in percentage by mass: 0.31-0.33% of C, 0.45-0.47% of Mn, 0.07-0.09% of Si, 0.006-0.008% of P, 0.002-0.005% of S, 0.06-0.08% of Nb, 0.07-0.09% of V, 0.05-0.07% of Ti, 0.08-0.1% of Al, less than or equal to 0.006% of N, less than or equal to 0.00020% of H, 0.012-0.015% of Cu, 0.4-0.6% of Cr, 0.23-0.25% of Mo and the balance of Fe. According to the anti-acid steel plate, a reasonable two-phase ratio as well as fine ferrite and dispersively distributed pearlite of the steel plate can be obtained and the formation of banded structure is avoided; and without the banded structure, the acid resistance is improved.

The invention discloses high-strength load-bearing steel for a storage rack. The steel plate comprises the following components by mass percent: 0.27-0.32% of C, 0.21-0.33% of Mn, 0.05-0.07% of Si, 0.006-0.008% of P, 0.002-0.004% of S, 0.09-0.11% of Nb, 0.04-0.06% of V, 0.36-0.39% of Ti, 0.05-0.07% of Al, N less than or equal to 0.006%, H less than or equal to 0.0002%, 0.17-0.19% of Cu, 1.7-1.9% of Cr, 0.33-0.35% of Mo, 0.02-0.04% of lanthanum, 0.01-0.02% of cerium, 0.05-0.07% of praseodymium, and the balance of Fe and unavoidable impurities. According to the high-strength load-bearing steel disclosed by the invention, the transverse yield strength of the steel plate is greater than or equal to 230 MPa, and the steel plate is high in strength and excellent in low-temperature toughness.

The invention discloses an anti-acid steel plate for steel structure work. The anti-acid steel plate for the steel structure work comprises, by weight, 0.27%-0.29% of C, 0.35%-0.37% of Mn, 0.17%-0.19% of Si, 0.006%-0.008% of P, 0.002%-0.005% of S, 0.03%-0.05% of Nb, 0.04%-0.06% of V, 0.15%-0.17% of Ti, 0.018%-0.019% of Al, equal and less than 0.06% of N, equal and less than 0.00020% of H, 0.022%-0.024% of Cu, 1.65%-1.67% of Ni, 0.54%-0.56% of Cr, 0.13%-0.15% of Mo, and the balance is Fe and inevitable impurities. The heating processing technology of normalizing-secondary normalizing-tempering is adopted to carry out heating processing, and the good toughness and the anti-acid property are provided.

The invention relates to a nano-silicate anti-oxidation coating used for annealing a series of steel billets. The coating is composed of 20-30% composite binder, 8-12% composite phosphate curing Aluminosilicate filler composition. Its characteristics: 1. Temperature resistance 1500 ℃; 2. No surface treatment in any way. The surface of the direct-sprayed steel billet is solidified at room temperature for ten minutes, collides and rubs against each other, making it difficult to be soft and hard; 3. All kinds of steel billets sprayed are quenched in water for a few seconds before annealing and hot rolling. Bell paint is self-detaching, self-departing without leaving paint traces, and improves the surface quality; 4. It can reduce the loss on ignition of various steels; 6. It can also be used for surface protection of refractory materials for furnace linings in various fields; industrial and civil fields as internal and external Wall coatings; bridges, piers, dams and other metal structures in the field of cement construction are waterproof, anti-corrosion, anti-oxidation, and have the unique performance of seawater resistance.

The invention provides a steel plate for a storage rack to bear load. The steel plate is prepared from such components as 0.37-0.39% of C, 0.41-0.43% of Mn, 0.05-0.07% of Si, 0.006-0.008% of P, 0.002-0.004% of S, 0.09-0.11% of Nb, 0.04-0.06% of V, 0.7-0.9% of Ti, 0.05-0.07% of Al, less than or equal to 0.006% of N, less than or equal to 0.00020% of H, 0.17-0.19% of Cu, 1.7-1.9% of Cr, 0.33-0.35% of Mo, 0.02-0.04% of lanthanum, 0.01-0.02% of cerium, 0.05-0.07% of praseodymium, and the balance of Fe and inevitable impurities. The transverse yield strength of the steel plate is greater than or equal to 220MPa; and the steel plate is high in ductility and excellent in low-temperature toughness.

The invention discloses a method for preparing ammonium polyphosphate wrapped in low-viscosity microcapsules. After the addition, reflux reaction for 0.5~5h, then lower the temperature to 40~50°C, then add the end-capping agent dropwise, after the dropwise addition, keep the temperature for 0.5~3h reaction, cool to room temperature, then filter, wash with solvent, drain, and use Rake dryer, drying under reduced pressure for 6~24h to obtain ammonium polyphosphate powder wrapped in microcapsules. Compared with the uncoated ammonium polyphosphate, the microcapsule-coated ammonium polyphosphate prepared by the present invention has low viscosity, excellent fluidity and compatibility, low water solubility, high temperature immersion resistance, precipitation resistance, excellent electrical properties, etc. features. It can be used in polymer materials such as polyolefins, and can also be used in fabrics, epoxies and coatings.

The invention relates to a solid-phase extraction material, a preparation method and application thereof, and belongs to the field of solid-phase extraction. The preparation method comprises the steps of prepolymerizing monomers N-vinylpyrrolidone and divinylbenzene in the presence of a chain transfer agent, and then adding dropwise to monodisperse seed microparticles. In the emulsion of the spheres, the steps of swelling and reacting to prepare white spheres are further carried out, and the white spheres are subjected to the reaction of introducing functional groups to obtain the solid phase extraction material. The solid phase extraction material prepared by the reaction has good spherical shape, large specific surface area and high ion exchange capacity. The prepared solid-phase extraction material works together with various forces in the process of separating and enriching PPCPs, and the extraction efficiency is high. At the same time, adjusting the pH of the eluent during the elution process can control the ionization degree of the substance or the extraction material. The substances are then selectively separated. The extraction experiment results show that the extraction recovery rate of the prepared solid phase extraction material is basically maintained between 85% and 105%, and acidic, basic, neutral and amphoteric substances can be selectively separated.

The invention provides a variable diameter telescopic pipe device of a knitter, belonging to knitters. The device comprises an up-and-down reciprocating device, a passing thread supporting and positioning device, a core fixing base and a rack, wherein the up-and-down reciprocating device is connected with the passing thread supporting and positioning device; the lower end of a core pipe of the passing thread supporting and positioning device passes through the core fixing base and the rack and is connected with the rack by the core fixing base; a motor of the up-and-down reciprocating device is connected with a moving part by a moving rod lifter; a thread passing convex cap is connected at the upper end of the core pipe of the passing thread supporting and positioning device; a core sleeve is arranged below the thread passing convex cap; a core fixing rod is connected in a blind hole at the upper end of the moving rod; the core sleeve is arranged in the core pipe and is connected outside the moving rod in a sleeving manner; the core fixing rod is connected in the blind hole of the moving rod in a sleeving manner; and a fastener pushes against the core fixing rod by passing through the core pipe, the core sleeve and a sliding chute of the moving rod. The device has the advantages that the device replaces manual operation and has the effect of saving manpower and raw materials; the variable diameter pitch is uniform, no wastes appear, and the product randomly extends or shrinks without deformation; and the product quality and yield are increased.

The invention relates to a covering-type silt prevention cover plate of an immersed tunnel gravel foundation bed. The covering-type silt prevention cover plate of the immersed tunnel gravel foundation bed comprises a frame, wherein a plurality of ballast water tank bodies into which water can be filled and from which water can be drained are arranged in the frame, and lifting points are arranged on the frame. A plurality of canvas bags for containing silt are arranged above the ballast water tank bodies, a cover plate installation vessel comprises two floating bodies, the tops of the floating bodies are connected through a portal frame, lifting hooks are arranged on the portal frame, a lifting machine is arranged on the floating bodies, and desilting equipment is arranged on the cover plate installation vessel. By adopting the cover plate covering-type silt prevention scheme, the foundation bed can be fully covered, the complete isolation between the silt and the foundation bed is realized and the quality of the foundation bed is guaranteed; foreign objects falling onto the foundation bed during construction directly fall onto the cover plate and can be prevented from occurring on the foundation bed; since full-coverage silt prevention is adopted, the flattening operation of the foundation bed can be performed in advance and the construction progress is accelerated; no destruction is caused to the foundation bed and the integrity of the foundation bed is guaranteed.

The invention discloses a dedicated wear-resisting anticorrosion steel plate for a storage rack platform and a preparation method of the steel plate. The steel plate comprises the following components by mass percent: 0.28-0.31% of C, 0.45-0.47% of Mn, 0.09-0.12% of Si, 0.006-0.008% of P, S less than or equal to 0.004%, 0.07-0.09% of V, 0.08-0.12% of Ti, 0.10-0.13% of Al, N less than or equal to 0.006%, 0.012-0.015% of Cu, 0.4-0.6% of Cr, 0.33-0.36% of Mo, 0.015-0.032% of rare earth trace elements, and the balance of Fe and unavoidable impurities; the rare earth trace elements comprise the following chemical components in mass percent: 8-12% of Nd, 11-16% of Ce, 3-5% of Er, 2-6% of Pr, 1-4% of Pm, 0-5% of Dy, and the balance of La. The preparation method of the steel plate disclosed by the invention can be used for achieving a reasonable two-phase ratio, small ferrites and dispersed pearlites, avoids banded structures, and further improves the acid resistance due to lack of the banded structures.