32results about How to "Good yield ratio" patented technology

The invention relates to a microbe germ composition, a cyanophyte biological germ leaven which contains the microbe germ, a cyanophyte fermentation nutrient, a cyanophyte biological organic fertilizer and a method for preparation, wherein the microbe germ composition contains plant lactobacillus, bacillus subtilis and swamp Rhodopseudomonas, the cyanophyte biological germ leaven is prepared by microbe germ composition and base, the cyanophyte fermentation nutrient is prepared by cyanophyte biological germ leaven and cyanophyte, the cyanophyte biological organic fertilizer is prepared by cyanophyte fermentation nutrient, organics base and water-loss reducer. The microbe germ composition is provided with the ability for fermenting solid cyanophyte, which can transform nutriment in the cyanophyte into the material for crops. The cyanophyte fermentation nutrient can be superior animal feed. The cyanophyte biological organic fertilizer is provided with crop pest control effect, which adds the soil organics content and improves nutrient utility to accelerate the plant growth belonging to natural superior organics fertilizer.

The invention discloses a producing method of hot rolled round steel used for a high-rise building structure. The composition weight percentage of the steel is 0.12-0.18 % of C, 0.25-0.50% of Si, 1.20-1.70% of Mn, no more than 0.025% of P, no more than 0.015% of S, no less than 0.020% of Al, 0.41-0.45% of carbon equivalent, and the balance Fe and unavoidable impurities; the key process steps include smelting, LF furnace forging, VD furnace forging, continuous casting, heating, rolling, and cooling; the tensile strength of the produced steel is at 470-630 Mpa, the yield strength is at 315-455 Mpa, the yield ratio is below 0.80, the elongation rate is above 22%, and the welding crack sensitivity coefficient is below 0.28%, the impact Akv at minus 20 DEG C is above 47 J. The hot rolled roundsteel used for the high-rise building structure has high strength, high yield ratio, elongating performance, low temperature impact performance, welding performance, seismic performance and the like and can well meet the using demands of the seismic, refractory, welding performances of the hot rolled round steel of various high-rise building structures.

The invention discloses pickling cold-formed steel and a manufacturing method thereof, and belongs to the technical field of steelmaking. The pickling cold-formed steel comprises the following chemical components in percentage by weight: less than or equal to 0.07% of C, less than or equal to 0.05% of Si, less than or equal to 0.45% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.060% of Als, less than or equal to 0.0100% of N, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following specific processing steps of: step 1, converter smelting; step 2, RH furnace refining; step 3, continuous casting; step 4, heating; step 5, rolling; step 6, cooling; step 7, coiling; step 8, pickling; and step 9, wetleveling. The microstructure of a hot-rolled steel plate manufactured by the manufacturing method is ferrite and pearlite, the yield strength of the product is 230-300 MPa, the tensile strength is 300-420 MPa, the elongation A50 is 38-45%, the 180-degree longitudinal bending test D =0a is qualified, the surface roughness of strip steel is 0.6-1.5, the surface whiteness of the strip steel is 55-65,the yellowness is 0.5-3.0, and the product has good yield ratio, elongation performance and cold bending performance, and has high-level roughness and surface gloss.

The invention discloses a casting technique of a high-strength high-speed train track. The high-strength high-speed train track is cast from 10-20% of iron chip, 60-65% of carbon steel and 20-25% of 310s stainless steel. The carbon steel comprises the following chemical components in percentage by mass: 0.30-0.37% of C, 0.70-1.00% of Mn, 0.60-0.90% of Si, 0.033-0.035% of P, 0.032-0.035% of S, 0.040-0.090% of Cr, 0.60-0.90% of Ni, 0.40-0.50% of Mo, 0.04-0.06% of Ni, 0.005-0.02% of Ti, 0.03-0.06% of Alt, 0.03-0.05% of Nb, 0.03-0.05% of V, and the balance of Fe and impurities. The technique ensures the cast steel rail to have excellent mechanical properties, favorable yield-tensile ratio and favorable low-temperature toughness, and obviously enhances the mechanical properties of steel.

The invention relates to a seamless flux-cored wire for high-manganese low-temperature steel of a LNG storage tank. The seamless flux-cored wire comprises low-carbon steel belt skin with mass percentage being 60-70% and a flux core with mass fraction being 30-40%; the flux core comprises the following components in percentage by mass: 65%-75% of electrolytic manganese metal, 8%-14% of nickel powder, less than 1.0% of silicon powder, less than 1.0% of sodium carbonate, 2%-8% of high-carbon ferrochrome and 4%-8% of sintering powder, and the balance iron powder; and the sintering powder comprises25%-30% of novel potassium titanate, 20%-25% of aluminum oxide, 10-15% of graphite, 25%-30% of magnesite and the balance bonding agent. The seamless flux-cored wire can be used for manufacturing theLNG storage tank, and has good impact toughness and base material matching strength at an ultra-low temperature, has good welding process property, can be suitable for multi-position welding, has chemical components matched with the base material, and is smoothly transited with the base material without cracks.

The invention discloses a marine high-strain welded steel pipe based on a double-phase structure and a preparing method thereof. The marine high-strain welded steel pipe is made by a wide and thick steel plate having the double-phase structure, the steel grade of the high-strain welded steel pipe is L485MO, the thickness is larger than or equal to 25.4mm, the width of the steel plate is pi(1-epsilon)D-2t, D refers to the outer diameter of the steel pipe, t refers to wall thickness, epsilon refers to a cold expanding rate, the radius-to-thickness ratio is smaller than or equal to 30, the yield-to-strength ratio Rt0.5/Rm is smaller than or equal to 0.85, A is larger than or equal to 25%, and UEL is larger than or equal to 7%. The manufactured steel pipe has the characteristics of high strength, high tenacity, high strain capability, low yield-to-strength ratio, low strain aging influence, H2S corrosion resistance, large wall thickness, small radius-thickness ratio, high diameter precision, small outer diameter error and small out-of-roundness error, can fully meet the technical requirements of marine service on the high-strain thick-walled delivery steel pipe, can be used for deep-sea oil and gas exploitation and saves marine development cost.

The invention discloses J55-grade low-yield-ratio steel for an electric resistance welding casing pipe and a manufacturing method of the J55-grade low-yield-ratio steel. The J55-grade low-yield-ratio steel comprises chemical components including, by weight percent, 0.090%-0.128% of C, 0.10%-0.35% of Si, 1.02%-1.25% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S, 0.01%-0.03% of Nb, 0.010%-0.030% of Ti, 0.30%-0.40% of Cr, 0.02%-0.06% of Als, smaller than or equal to 0.008% of N and the balance Fe and inevitable elements. The method is characterized in that a continuous casting sheet billet is heated to 1160-1200 DEG C through a heating furnace, and the final rolling temperature in the first stage is larger than 980 DEG C; the rolling starting temperature in the second stage ranges from 980 DEG C to 1020 DEG C, and the final rolling temperature ranges from 810 DEG C to 865 DEG C; laminar flow intermittent cooling is adopted for a rolled steel strip, and the cooling speed ranges from 12 DEG C/s to 18 DEG C/s; and coiling is conducted at the temperature ranging from 590 DEG C to 680 DEG C. The J55-grade low-yield-ratio steel has the beneficial effects that the carbon content is relatively low, and weldability and the impact toughness are good; and a proper number of Cr alloy is added, the safety of a steel pipe is good, and it is ensured that the yield strength and the tensile strength meet the standard requirement.

The invention relates to the technical field of metal material processing, in particular to a hot-rolled steel plate for a submarine conveying pipe and a preparation method thereof. The chemical components of the hot-rolled steel plate include 0.03-0.05% of C, 0.15-0.25% of Si, 1.40-1.60% of Mn, 0.02-0.04% of Al, 0.02-0.04% of Nb, 0.010-0.020% of Ti, 0.40-0.50% of Ni, 0.15-0.25% of Cr, 0.10-0.20%of Mo, 0.008% or less of P, 0.001% or less of S and the balance Fe and inevitable impurity elements. By innovating the chemical composition, the production process and the microstructure, the preparedhot-rolled steel plate has excellent mechanical properties and good welding performance, reduces the risk of deformation and fracture failure of the submarine conveying pipe under the influence of ocean waves, ocean currents, submarine earthquakes, faults and seabed collapse, and has good application prospects.

The invention discloses an automobile hot rolled steel plate with the good broaching performance and the low yield ratio and a manufacturing method thereof. Steel comprises 0.03%-0.06% of C, 0.80%-1.50% of Si, 1.0%-2.0% of Mn, 0.02%-0.06% of Als, 0.50%-0.80% of Mo, 0.03%-0.06% of Nb, 0.02%-0.05% of V, less than or equal to 0.010% of P, less than or equal to 0.003% of S, and the balance iron and inevitable impurities. The manufacturing method comprises the steps of heating a plate blank to 1220-1250 DEG C and then conducting heat preservation for 1-2 h; keeping the total reduction rate of a non-recrystallization region greater than 90% and the finished rolling temperature at 750-800 DEG C; cooling a steel plate to 620-650 DEG C at the laminar cooling rate of 10-15 DEG C/s in the laminar cooling and rapid cooling mode after finished rolling, conducting rapid cooling at the cooling rate greater than 50 DEG C/s to 500-550 DEG C and then reeling the steel plate. The finished steel plate hashigh strength and good yield ratio and hoe expansion rate for matching and is suitable for an automobile chassis, a seat or other parts.

The invention discloses a high-strength steel submerged-arc stranded wire. The high-strength steel submerged-arc stranded wire comprises the following components of, by mass percentage, 0.08-1.2% of carbon, 0.4-0.8% of manganese, 0.05-0.1% of copper, 0.1-0.2% of nickel, 0.1-0.2% of zirconium, 0.11-0.18% of silicon, 0.02-0.08% of molybdenum, 0.01-0.02% of titanium, 0.2-0.4% of boron, less than 0.01% of phosphorus, not larger than 0.005% of sulfur and the balance iron and inevitable impurities. The invention discloses a welding method of the high-strength steel submerged-arc stranded wire. The welding method comprises the steps that a steel plate to be welded is pretreated, then the inner side welding and the outer side welding are carried out, and then heating, heat preservation and air cooling are carried out. A welding seam formed by welding has the beneficial effects of being good in low-temperature impact toughness, low in yield ratio, high in strength, attractive in forming and thelike; and moreover, the welding spatter is small, and the welding process performance is excellent.

The invention discloses a large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and a production method thereof, and belongs to the technical field of metallurgy. The steel plate comprises the following chemical components in percentage by weight: 0.12-0.14% of C, 0.06-0.08% of Si, 0.4-0.6% of Mn, 0.007-0.009% of P, less than or equal to 0.004% of S, 2.2-2.5% of Cr, 1.0-1.1% of Mo, 0.28-0.35% of V, 0.1-0.2% of Ni, less than or equal to 0.05% of Nb, less than or equal to 0.2% of Cu, less than or equal to 0.003% of Sb, less than or equal to 0.004% of Sn, less than or equal to 0.005% of As and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting and carrying out die casting, annealing cast ingots, cogging and annealing, carrying out mechanical treatment, annealing steel billets, carrying out hot rolling and carrying out heat treatment. According to the large-thickness and high-piece-weight vanadium-chromium-molybdenum steel plate and the production method thereof, the risk of generation of cracks on the surface of the steel plate can be reduced; and the steel plate is excellent in cold bending performance and can be widely used in equipment such as a hydrogenation reactor and the like.

The invention relates to a low-temperature-resistant and easy-to-weld ultra-low-carbon steel thick plate and a preparation method thereof. The low-carbon steel is prepared from the following components in percentage by weight: 0.04% to 0.07% of C, 0.15% to 0.35% of Si, 0.10% to 0.30% of Cr, 1.20% to 1.60% of Mn, 0.10% to 0.20% of Mo, 0.03% to 0.07% of Nb, 0.01% to 0.04% of V, 0.002% to 0.010% of Ti, 0.05% to 0.30% of Cu, 0.01% to 0.02% of Ni, 0.01% to 0.03% of Al, 0.0015% to 0.0050% of Ca and the like, and the balance of Fe and inevitable impurities; and steel making, continuous casting, heating, rough rolling, finish rolling and multi-stage cooling are adopted, the low-carbon steel with a ferrite and bainite dual-phase structure and small grain size is obtained, and the low-carbon steel has the advantages of being high in low-temperature strength, high in crack arrest toughness, low in yield ratio and the like.