950 results about "Pearlite" patented technology

The invention discloses a steel plate for stamping and quenching and a thermoforming method of the steel plate. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.28% of C, less than 0.40% of Si, 0.4-2.0% of Mn, less than or equal to 0.010% of P, less than or equal to 0.004% of S, 0.016-0.040% of Al, 0.15-0.8% of Cr, 0.015-0.12% of Ti, 0.0001-0.005% of B, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities. The thermoforming method comprises the following steps: blanking by shearing the steel plate, and heating at Ac3 to (Ac3+80) DEG C to carry out austenization; after insulating for 5-10 minutes in the heating furnace, immediately transferring the steel plate to a metal mold the inside of which is cooled by introducing water, and stamping at the high temperature of 650-850 DEG C; cooling the formed workpiece in the closed mold, and cooling the mold by water circulation in the mold, wherein the cooling rate is greater than the critical cooling rate when austenite forms martensite, and the temperature of the workpiece leaving the hot stamping production line is below 150 DEG C; and carrying out air-cooling to room temperature. The steel plate has the advantages of simple component system and favorable hardenability; and the substrate tissues, which are ferrite and pearlite, are processed by hot stamping andquenching to obtain the all martensitic structure. The tensile strength of the steel plate can be higher than 1300 N/mm<2>.

The invention discloses a corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance, belonging to the technical field of heavy rail steel. A fundamental alloy system comprises the following alloy elements by weight percent: 0.55%-0.72% of C, 0.35%-1.1% of Si, 0.7%-1.40% of Mn, 0.2%-0.65% of Cr, 0.2%-0.65% of Cu and Fe as the balance; on the basis of the above fundamental ingredients, one or more than one microalloy elements are simultaneously added, including: 0.01%-0.055% of Nb, 0.05%-0.10% of V, 0.001%-0.05% of Ti, 0.1%-0.3% of Ni and 0.15%-0.3% of Mo. The heavy rail steel has the advantage that: mechanical properties of steel rail including strength, toughness, fatigue resistance, abrasive resistance, fracture toughness property and welding property are remarkably enhanced, so that superfine pearlite can be obtained without the need of adopting complex production technology such as rail end quenching. And simultaneously, the steel includes corrosive resistance so as to greatly enhance the service property and the service life of steel rail in corrosive environment.

The purpose of the present invention is to provide a high strength thin steel sheet that has high hydrogen embrittlement resisting property. In order to achieve the above purpose, a high strength thin steel sheet having high hydrogen embrittlement resisting property comprises: C: 0.10 to 0.25%; Si: 1.0 to 3.0%; Mn: 1.0 to 3.5%; P: 0.15% or less; S: 0.02% or less; and Al: 1.5% or less (higher than 0%) in terms of percentage by weight, with balance of iron and inevitable impurities; and the metal structure comprises: residual austenite; 1% by area or more in proportion to the entire structure; bainitic ferrite and martensite: 80% or more in total; and ferrite and pearlite: 9% or less (may be 0%) in total, while the mean axis ratio (major axis/minor axis) of said residual austenite grains is 5 or higher, and the steel has tensile strength of 1180 MPa or higher.

The invention provides a pearlite steel rail of high internal hardness type which is excellent in both wear resistance and fatigue failure resistance and a process suitable for the production of the rail. Specifically, a pearlite steel rail which has a composition containing by mass C: 0.73 to 0.85%, Si: 0.5 to 0.75%, Mn: 0.3 to 1.0%, P: 0.035% or below, S: 0.0005 to 0.012% and Cr: 0.2 to 1.3% with the balance consisting of Fe and unavoidable impurities and having a ¢%Mn!/¢%Cr! ratio of 0.3 or above and below 1.0 (wherein ¢%Mn! is Mn content and ¢%Cr! is Cr content) and whose railhead exhibitsan internal hardness of Hv380 or above and below Hv480 in terms of Vickers hardness (Hv)in a depth range of at least 25mm from the railhead surface.

The invention provides a hot-rolled high-strength steel sheet for static enameling and a manufacturing method for the steel sheet. The main components by weight of the steel sheet are: C: 0.02-0.1%, Si<=0.1%, Mn: 0.2-1.5%, P: <=0.035%, S<=0.035%, Al: 0.01-0.1%, N: 0.001-0.01%, Ti: 0.01-0.1 %, Nb: 0.001-0.1%, and the remainder are iron and unavoidable foreign matters. The structure of the steel sheet comprises ferrite and pearlite, an the average particle diameter of the ferrite is not more than 11 micrometer. The manufacturing method of the steel sheet is, rolling twice the continuously cast or steel blanks after heating to 1100-1250 DEG C with total pressure-down amount <=50%, and final rolling temperature >=800 DEG C, then cooling section by section to coiling temperature 550-700 DEG C, and finally leveling the sheet. The hot-rolled high-strength steel sheet is applicable for pressure vessels such as bladders of water heaters, liquid-storing tanks and water buckets, etc. that are manufactured by static enameling process, is of high strength and good plasticity, high resistance to scaling bursting and air tightness.

The invention discloses a light ecological concrete brick and a preparation method thereof. The light ecological concrete brick is formed by that cement, gravel, pearlite or expanded vermiculite, saw dust (or straw dust, paper scrap and the like), mixed microorganism and water are mixed at certain ratio, are shaped by a mould and are naturally hardened, wherein the mixed microorganism comprises six floras, i.e. bacillus, nitrobacteria, photosynthetic bacteria, saccharomycete, lactic acid bacteria and actinomycete. The light ecological concrete brick of the invention has favourable and long-lasting water purification function because of containing multiple microorganisms and can suspend and even float on the water because of containing light and porous pearlite or expanded vermiculite components with strong adsorption force, which is more favourable for the apposition growth of the microorganism and enlarges contact area with water. The invention can be widely applied on purifying various kinds of water, such as rivers, lakes, ditch water, swimming pools, aquariums and the like.

The present invention provides a high strength steel used for spring steel that has excellent hydrogen embrittlement resistance. The high strength steel which spring steel having excellent hydrogen embrittlement resistance comprises 0.20 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, higher than 0% and not higher than 1.5% of Al, 0.15% or less P, 0.02% or less S, and balance of iron and inevitable impurities and the structure includes: 1% or more residual austenite; 80% or more in total of bainitic ferrite and martensite; and 10% or less (may be 0%) in total content of ferrite and pearlite in the proportion of area to the entire structure, and also the mean axis ratio (major axis/minor axis) of the residual austenite grains is 5 or higher and the steel tensile strength is 1860 MPa or higher.

The invention relates to a material for a niobium alloy cast iron braking disc and a production technology thereof, and belongs to the field of production technology of high-carbon equivalent hypereutectic gray cast iron. The material for the niobium alloy cast iron braking disc comprises the following chemical compositions in weight percentage: 3.7 to 3.9 percent of carbon, 1.8 to 2.2 percent of silicon, 0.5 to 0.8 percent of manganese, less than or equal to 0.08 percent of sulfur, less than or equal to 0.60 percent of copper, less than or equal to 0.20 percent of nickel, less than or equal to 0.05 percent of vanadium, less than or equal to 0.05 percent of stannum, less than or equal to 0.05 percent of titanium, less than or equal to 0.25 percent of chrome molybdenum, 0.08 to 0.3 percent of niobium, and the balance being iron, wherein the iron is melted by an intermediate frequency furnace. The structure of the material is characterized by comprising pearlite, graphite (A3-5), and a small amount of ferrite The performance characteristics of the material are as follows: the hardness HB is more than or equal to 150 and the tensile strength is more than or equal to 170 N/mm<2>. The material is suitable for braking discs for medium-to-high grade sedans made of gray cast iron, and has the advantages of stable performance, low cost, longer service life, and convenient processing.

The invention provides tensile strength more than or equal to 780MPa grade hot-rolled dual phase steel. The dual-phase steel comprises the following components in percentage by weight: 0.05-0.08 percent of C, not more than 0.5 percent of S, 0.6-1.2 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.006 percent of N, 0.01-0.1 percent of Als, 0.05-0.25 percent of Ti, less than or equal to 0.6 percent of Cr or less than or equal to 0.003 percent of B or mixture of Cr and B. The production method by using CSP comprises the following steps: melting and continuously casting to form a slab; heating the continuous cast slab; rolling; carrying out laminar cooling; reeling; and naturally cooling to room temperature. The hot-rolled dual phase steel has the tensile strength of more than or equal to 780MPa, elongation of more than or equal to 15 percent and yield ratio of less than or equal to 0.70. An insulation cover additionally covers the intermediate insulation section, and the band steel cooling speed is reduced, so that generation of pearlite phase change can be effectively prevented. Production of hot-rolled dual phase steel with thickness of 1.2-4.0mm can be realized, the product has the advantages of uniform structure, small molding resilience and no cracking, existing equipment is utilized without adopting ultra fast cooling and other equipment, the production efficiency is high, and the investment is small.

A gypsum-based mortar for plastering is prepared from semi-hydrated gypsum, quartz sand, Ca(OH)2, powdered coal ash, slag, lime stone, hoolamite, volcanic dregs, haydite, polystyrene foam, expanded pearlite, zeolite, and ethene-vinyl acetate copolymer resin. Agypsum-based mortar for automatic leveling is prepared from semi- hydrated gypsum, quartz sand, Ca(OH)2, powdered coal ash, slag, lime stone, ethene-vinyl acetate copolymer resin, methyl hydroxyethyl (or hydroxypropyl) cellulose ether, sulfonated cyanuramide-formaldehyde resin and gluconate.

The invention provides a method which uses hot-finished non-anneal rod to produce 8.8-grade high-strength cold heading steel. The invention still utilizes general ultra-liner rolling device in the process of rolling medium carbon cold heading steel and utilizes general temperature of 950-1050Deg. C in the rough, middle and pre-finished rolling steps. The finished rolling step utilizes heat engine rolling process which is characterized in that the rolled piece is recovered via water cooling and long channel after the pre-finished rolling, and it is fed into finished-rolling machine when the temperature is reduced to the low-temperature area of 730-830Deg. C, and the steel is transformed at dual-phase (ª†+ª‡) region with large transformation valve; the accumulated draft can reach 35-82%; then the rolled piece is quickly water cooled to 800-620Deg. C to be kept temperature for 600-2400 second and natural cooled to room temperature. The invention can reduce the proportion of pearlite via increasing the proportion of ferrite, to spheroidize a part of pearlite and reduce the strength and rigidity and improve the ductility of material, therefore it can realize the purpose of beating bolt without anneal before cold heading.

There are provided a hot rolled steel sheet that has superior hot press forming property and high tensile strength and is used for structural members and their parts of automobiles and the like, a formed article, and a method for manufacturing the hot rolled steel sheet and the formed article. The hot rolled steel sheet having superior hot press forming property and high tensile strength includes, by weight: C: 0.1 to 0.5%, Mn: 1.0 to 3.0%, Si: 0.5% or less, W: 0.1% or less, N: 0.01 to 0.1%, Al: 0.01 to 0.1%, S: 0.03% or less, P: 0.1% or less and B: 0.001 to 0.01%, at least one element selected from the group consisting of Ti: 0.001 to 0.1%, Nb: 0.001 to 0.1% and V: 0.001 to 0.1%, at least one element selected from the group consisting of Mo: 0.01 to 1.5%, Cr: 0.01 to 1.5%, Cu: 0.005 to 1.0% and Ni: 0.005-2.0%, and the balance of iron (Fe) and other inevitable impurities, wherein a structure of the hot rolled steel sheet includes 10% or less of proeutectoid ferrite, 10% or less of pearlite and the balance of bainite, or includes 10% or less of proeutectoid ferrite, 10% or less of pearlite and the balance of bainite and martensite.

A modified adsorbent for adsorbing oil from water features that the organic silicon substance chosen from sodium methylsilicate, methyl silicon oil, phenyl silicon oil, methylethyl silicon oil, ethyl oil, hydrogen contained methyl silicon oil, etc is used to modify the surface of the adsorbent chosen from montmorillonite, bentonite, diatomite, pearlite, powdered coal ash, etc to generate a lipophilic film layer, so increasing its oil adsorptivity.

A low-alloy high-strength steel plate with high yield strength (460 MPa) contains C (0.13-0.20 wt.%), Si (0.2-0.5), Mn (1.3-1.7), Nb (0.01-0.02) Ti (0.005-0.01), Al (0.005-0.015) and Fe (rest). Its preparing process features that two-stage rolling at 1200-1250 deg.C and quick cooling. Its advantages are multi-phase structure including polygonal and acicular ferrite, pearlite and bainite, high yield strength and low cost.

The invention relates to a production process of a high-cleanliness non-quenched and tempered plastic mold thick steel plate. The high-cleanliness non-quenched and tempered plastic mold thick steel plate is chemically composed of, by weight percentage, 0.25-0.45% of carbon, 0.20-0.50% of silicon, 0.70-1.50% of manganese, 0.70-2.00% of chromium, 0.15-0.55% of molybdenum, less than 0.01% of phosphorus, less than 0.005% of sulfur, 0.0010-0.030% of calcium, balanced iron and inevitable impurities. The chemical composition is simple in design; by means of the C-Mn-Cr-Mo alloying technology, the content of Mn and Cr can be improved;, by adding a certain amount of Mo, conversion of austenite to ferrite and pearlite can be inhibited, so that the high-cleanliness non-quenched and tempered plastic mold thick steel plate can have high hardenability and obtain a bainite structure; without the elements of Ti and V which are prone to generating inclusions, relatively clean steel can be obtained. The high-cleanliness non-quenched and tempered plastic mold thick steel plate has the advantages of being internally clean and compact, low in content of inclusions and capable of fundamentally eliminating pores, can meet the requirements of advanced plastic molds on internal high quality of steel and can be applied to the plastic mold industries such as automobile and electric appliances.

The invention relates to an annealing-free medium-high carbon steel plate making technology, and belongs to the technical field of steel rolling technologies. A technical scheme adopted in the invention is characterized in that the technology comprises the operations of heating furnace heating, vertical roll rolling, roughing scale removal, roughing rolling, intermediate cooling, precision rolling scale removal, precision rolling, laminar cooling, reeler reeling and concentrated pile cooling, the intermediate cooling operation is carried out after the roughing rolling operation and before the precision rolling scale removal operation and is realized through cooling plate blanks by a cooling device, and the cooling capability of the cooling device makes the temperature of the plate blanks decrease to below 840DEG C. The technology has the following beneficial effects: the elongation rate after fracture of produced products obviously rises, the hardness of the products decreases by 7.2-21%, the proportion of ferrite in the structure of the products is above 60%, ferrite crystal grains are appropriately coarsened, the pearlite colony is small and dispersed, and the cementite sheet in pearlite is attenuated, fragmented and partially granulated. An annealing operation after rolling can be avoided because of the low hardness and high plasticity in order to reach an online softening purpose.

The present invention discloses on-line medium carbon steel nodularizing and rolling process. The process includes low temperature finish rolling at 680-850 deg.c and accumulated cross section deformation of 50 %-80 %, controlled cooling after rolling at 3-15 deg.c/s to 660-720 deg.c, isothermal course, and naturally cooling to room temperature. The said technological scheme results in metallographic structure of the rolled piece with high ferrite component, less pearlite component, small and dispersed pearlite and granular cementite, lowered strength and hardness, raised plasticity and excellent cold machining performance.

Super Bainite Steel is described comprising between 90 % and 50 % bainite, the rest being austenite, in which excess carbon remains within the bainitic ferrite at a concentration beyond that consistent with equilibrium; there is also partial partitioning of carbon into the residual austenite. Such bainite steel has very fine bainite platelets (thickness 100nm or less). In this specification the expression 'Super Bainite Steel' is used for such steel. In particular, the impact of varying the manganese content to achieve fast transformation times, and hence low manufacturing costs without the presence of expensive alloying materials is discussed. In one embodiment of the invention a Super Bainite Steel comprises in weight percent: carbon 0.6 to 1.1 %, silicon 1.5 to 2.0 %, manganese 0.5 to 1.8 %, nickel up to 3 %, chromium 1.0 to 1.5 %, molybdenum 0.2 to 0.5 %, vanadium 0.1 to 0.2 %, balance iron save for incidental impurities. In particular it was noted that excellent properties were obtained if the manganese content is about 1% by weight. Various processes for making the Super Bainite Steel are discussed, but a particularly useful process includes the step of cooling the steel from an austenite quickly enough to avoid transformation to pearlite and transforming the steel to bainite at a temperature in the range 190 DEG C to 2500 DEG C. The patent discusses the impact of changing the transition temperature on hardness, and conclude that the invention can provide a very hard steel (>630HV). It is also noted that suitable pearlite can be produced for cutting drilling and shaping, before final transformation to Super Bainite Steel.

The invention discloses a Q345GJ series structural steel plates for an ultra-thick building and a production method thereof. In the Q345GJ series steel plate, the yield strength is controlled at 335-420MPa, the tensile strength is controlled at 505-585MPa, the elongation ratio is controlled at 25-29%, the V-shaped shock power at 0 DEG C is controlled at 156-190J, the yield ratio is 0.62-0.81 and is 0.69 in average, the single lamellar tearing resisting capacity is 32-48% and is 40.2% in average, and the performance indexes completely satisfy the Q345GJCZ35 development requirement. In addition, the steel plate tissues subjected to controlled rolling are ferrite and pearlite and has the grain size up to 8-9 level. After normalizing treatment, the ferrite and pearlite tissues in the steel plate are more uniform, and the grains are refined to reach 10.5 level.

The invention discloses an intermediate temperature thick wall WB36/1Cr18Ni9Ti heterogenous steel welding technique relating to a pearlite(P)/ austenite (A) welding technique. The A technique of the invention includes: {1}buttering three layers first at a WB36 steel side by A307 welding rod as an insulating layer; not preheating when welding and carrying through dehydrogenation treatment after welding; a Phi 3.2mm welding rod must be adopted when buttering a first layer to carry through small current welding with a current range of 70 to 90A for reducing dilution on the welding rod; {2} polishing the surface of the buttering layers to 8mm to form a WB36/1Cr18Ni9Ti butt joint form according with the requirement of criterion; {3} using the A307 or A 137 welding rod to fill and the diameter of the welding rod is Phi 3.2mm or Phi 4.0mm; {4} canceling the heat treatment after welding. The invention reduces the manufacture cost and improves the manufacture efficiency simultaneously when ensuring and improving the joint quality of welding. The invention is suitable for intermediate temperature thick wall WB36/1Cr18Ni9Ti heterogenous steel welding.

The invention relates to a bainite isothermal quenching thermal treatment process for medium-carbon bearing steel. The process comprises the following steps of: performing normalizing treatment to obtain a flaky pearlite structure; then performing spheroidizing annealing treatment to obtain a fine and uniform spheroidized structure; and performing bainite isothermal quenching and low-temperature tempering treatment on a spheroidized steel member. The bearing treated by the process method has high hardness, high impact toughness, high wear resistance and long fatigue life, meets the requirements of bearing performance of impact-resistant and heavy-load metallurgical mines, petroleum and the like well, and has better economic benefit.

The invention discloses a nutrient slowly-released type substrate block for vegetable seedling. The substrate block comprises the following components: peat, vermiculite, pearlite, spent mushroom composts, chopped straws, coated controlled-release urea and coated controlled-release compound fertilizers. The substrate block is prepared by such natural materials as peat, vermiculite and pearlite, and agricultural organic wastes and polymer-coated controlled-release fertilizers. The substrate block is especially suitable for seedling of the vegetables planted with seeds. The main nutrients in the substrate are provided by the polymer-coated controlled-release fertilizers and the content of the nutrients is improved by more than 10 times over the common seedling substrates; meanwhile, the substrate can be matched with the controlled-release fertilizers with different release speeds according to the needs of the cultivated plants so as to ensure the release speed of the nutrients in the substrate to meet the nutrient needs of different cultivated plants. Being used for crop seedling, the substrate block can realize that additional fertilizers are not needed in the seedling stage and even the early growth stage.

The invention discloses hot rolled dual-phase steel sheets with high stretch-flangeability and a manufacturing method thereof. The manufacturing method has the following advantages: (1) the contents of C and Si are reduced, Mo is eliminated and defined amount of Cr and P are added, thus substantially lowering the cost and being beneficial to improvement of the surface quality and welding properties of the steel sheets; (2) the continuous casting slabs with medium thickness are adopted, and the walking beam furnace is used as buffer, thus realizing connection of casting machines and rolling machines, which are subjected to confluence and direct hot charging rolling; and high temperature rolling, water cooling+air cooling+water cooling stepped cooling path control technology and medium temperature coiling are adopted, so the sheet shapes are obviously improved, thus improving the stability of the steel sheet properties; and (3) the pearlites are effectively restrained by the advanced thermo mechanical control process and P and Cr microalloying paths, thus promoting generation of soft and hard phase structures of ferrites and bainites (or containing fewer martensites); the crystallite dimensions of the ferrites are 4-10mu m; and the hot rolled dual-phase steel with high stretch-flangeability and tensile strength being not less than 580MPa, stretch rate being not less than 26% and hole-expansion rate being not less than 75% is manufactured.

A high-strength cold rolled steel sheet of low YP with less material quality fluctuation, comprising, by mass, 0.01 to 0.12% C, 0.2% or less Si, less than 2% Mn, 0.04% or less P, 0.02% or less S, 0.3%or less sol. Al, 0.01% or less N and more than 0.3 to 2% Cr so that the relationships 2.19<(¢%Mn!+1.3OE%Cr))<3 and 0.24=¢%Cr!/¢%Mn! are satisfied (¢%Mn! and ¢%Cr! represent the contents of Mn and Cr,respectively) and comprising the balance iron and unavoidable impurities, which steel sheet has ferrite and the second phase of 2 to 25% area ratio. In the second phase, the area ratio of pearlite orbainite is less than 20%, and the average grain diameter of the second phase is in the range of 0.9 to 7 ¢mu!m. In the second phase, the area ratio of grains of less than 0.8 ¢mu!m grain diameter isless than 15%.

The invention relates to a method for vermicular cast iron by using a mixed vermiculizer, which comprises the following steps: 1) proportioning; 2) preparing the mixed vermiculizer; 3) vermiculizing; 4) carrying out secondary inoculation; 5) carrying out test sprue and quick metallographic examination; 6) removing slag for coverage; and 7) casting. The molten iron sulfur content detection determines that when a vermiculizer formed by mixing a rare-earth magnesium-calcium vermiculizer and a low-silicon magnesium conglomeration nodulizer in different ratios is used for vermiculization, after carrying out primary inoculation with a silicon-barium inoculator and secondary inoculation with a 75 iron-silicon alloy, the vermicular percentage of the prepared vermicular cast iron is greater than or equal to 85%, the pearlite content in the base is greater than or equal to 50%, the tensile strength sigma b is greater than or equal to 420Mpa, the hardness is HB175-210, and the elongation percentage delta is greater than or equal to 1.5%.

Provided is a steel wire rod for a high strength and high toughness spring having excellent cold workability, the steel wire rod having a composition comprising: in weight %, C: 0.4 to 0.7%, Si: 1.5 to 3.5%, Mn: 0.3 to 1.0%, Cr: 0.01 to 1.5%, Ni: 0.01 to 1.0%, Cu: 0.01 to 1.0%, B: 0.005 to 0.02%, Al: 0.1% or less, O: 0.0020% or less, P: 0.02% or less, S: 0.02% or less, N: 0.02% or less, remainder Fe, and other unavoidable impurities, having a microstructure formed of ferrite and pearlite, and in which a prior (before cooling) austenite grain size is 8 μm or less.

The invention discloses casting thick large-section pearlite nodular cast iron and a casting method thereof. The nodular cast iron comprises the following components in percentage by weight: 3.4%-3.7% of C, 2.1%-2.6% of Si, 0.4%-0.8% of Mn, at most 0.04% of P, at most 0.02% of S, 0.03%-0.05% of Mg, 0.4%-1.0% of Cu, 0.01%-0.02% of Sb, 0.01%-0.03% of rare earth, other microelement the total content of which is at most 0.1%, and the balance of iron. The casting method comprises the following traditional technology steps: blending, smelting, balling treatment, inoculation treatment and pouring. As for the casting thick large-section pearlite nodular cast iron, the tensile strength is more than or equal to 592MPa, the yield strength is more than or equal to 357MPa, the specific elongation is more than or equal to 4%, Brinell hardness is HB224-HB240, the pearlite content is more than or equal to 85%, and the casting thick large-section pearlite nodular cast iron has a favorable mechanic property.

The invention discloses a green fertilizer capable of improving soil and a preparation method thereof. The green fertilizer is prepared from the following raw materials in parts by weight: 30-50 parts of animal giblets, 15-20 parts of wheat bran, 12-18 parts of furfural residue, 10-15 parts of bark, 14-22 parts of Chinese medicine residue, 11-19 parts of manioc waste, 8-16 parts of flax seed meal, 5-10 parts of manganese slag, 5-10 parts of plant ash, 6-12 parts of oyster-shell powder, 10-15 parts of leaf mould, 5-10 parts of crushed crude pearlite, 4-8 parts of cologne acid mother liquor, 10-15 parts of tung greensand, 5-10 parts of stone fine grain, 10-15 parts of modified attapulgite, 3-5 parts of chitin oligosaccharide, 2-4 parts of alum powder, 15-20 parts of ammonium sulfate, 10-15 parts of monopotassium phosphate,1-2 parts of ferrous sulfate, 0.5-1 part of sodium borate, 1-2 parts of zinc sulfate and 0.5-1 part of ammonium molybdate. By adopting the green fertilizer capable of improving soil disclosed by the invention, the organic matter of the soil can be increased, the soil fertility is improved, meanwhile, the soil structure also can be improved, the soil pests are prevented and treated, the phenomena of soil degradation, soil fertility reduction and soil hardening are effectively improved, and healthy and quick growth of green plants is facilitated.

The invention discloses a novel industrial breeding matrix, which comprises the following components in percentage by weight: 13.8 to 14.2 percent of mycorrhizal fungi, 66 to 69 percent of turf, 3.4 to 4.6 percent of amino acid organic fertilizer, 6.9 to 8.1 percent of pearlite, 6.5 to 7.5 percent of vermiculite, and 0.25 to 0.48 percent of trianum. The mycorrhizal fungi, the trianum and the amino acid organic fertilizer are added into the traditional matrix, so that the breeding matrix can better promote crops to absorb nutrient elements, such as water, phosphorus, potassium, Zn, Cu and the like, and cultures high quality strong seedlings without germs and poisons, and has the advantages of high livability of the seedlings, short seedling stage of the seedlings, greater economic benefit, capability of saving cost of the seedlings and seeds.

The invention discloses a manufacturing method of low-yield-ratio carbon-manganese low-temperature steel. The chemical components of the low-yield-ratio carbon-manganese low-temperature steel comprises, by weight, 0.05-0.09% of C, 0.10-0.40% of Si, 1.30-1.50% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, less than or equal to 0.010% of Nb, 0.030-0.060% of Al, and thebalance Fe and inevitable impurities. By adopting the design of low-carbon, high-manganese and high-aluminum components, fine quasi-polygonal ferrites and a few acicular ferrites and pearlitic structures through cooperation of the dynamic soft reduction control technology during the continuous casting process and high-temperature heavy reduction and fast cooling control process after rolling during the rolling process. Compared with steel for liquefied petroleum gas tankers, the low-yield-ratio carbon-manganese low-temperature steel has the characteristics of being pure in steel quality, lowin yield ratio, high in toughness and excellent in low-temperature welding performance. The ductile-brittle transition temperature of a steel plate in the thickness direction is lower than minus 80 DEG C, and the postwelding welding performance at minus 70 DEG C is excellent. Moreover, there is no need to add microalloy elements such as Cu and Cr, and the manufacturing cost is low.