52results about How to "Increased impact value" patented technology

The invention discloses a pile main bolt manufacturing technique of a million kilowatt grade nuclear power station. The manufacturing technique includes material-selecting, melting, heating, forging, cooling, after-forging heat treatment, defect-detecting, and forging capability heat treating. When selecting the material, the microelement content of the materials is controlled, the heat preserving duration in the intermediate temperature stage is prolonged, the heat raising and the heat preserving duration in the high temperature stage are reduced, the distortion volume in the course of the forging is controlled between 30 percent and 70 percent, the forging rate reaches 5 above; after-forging heat treatment, ultrasonic defect detecting, and forging capacity heat treating are conducted when the forging is finished. The main bolt produced according to the manufacturing technique of the invention can improve the impact value under the circumstance that the intensity keeps unchanged, theproduct can meet the RCC-M standard requirements completely, and the reliability and the safety of the pile pressure container using the main bolt of the million kilowatt grade nuclear power station can be ensured.

The invention discloses martensitic stainless steel, which comprises the following components in percentage by mass: 0.10-0.15 percent of carbon, 0.20-0.50 percent of silicon, 0.50-1.50 percent of manganese, 2.00-4.00 percent of nickel, 15.00-17.00 percent of chromium, 0.03-0.30 percent of molybdenum, 0.020-0.200 percent of nitrogen, 0.01-0.10 percent of rare earth, less than or equal to 0.25 percent of copper, less than or equal to 0.025 percent of sulfur, less than or equal to 0.040 percent of phosphorous and the balance of Fe and inevitable impurities. The martensitic stainless steel has strength and plasticity, high low-temperature impact ductility and corrosion resistance, and can be applied to a hydraulic cylinder shaft for manufacturing a ship. The invention also discloses a manufacturing method of the martensitic stainless steel.

A fillet rolling nodular cast iron crankshaft is made of QT800-6 nodular cast iron materials and has a high elongation rate and a higher impact value. Rolling force can be effectively improved, transition fillets of a main journal, a rod journal and a crank arm are of undercutting groove structures, critical sizes such as linearity and cylindricity of the main journal and the rod journal can be effectively ensured, and swelling of journal surfaces caused by flow of parts of materials is prevented in the rolling process. By the aid of the strengthening technology of 'journal quenching and fillet rolling', the fillet rolling nodular cast iron crankshaft can obtain high fatigue bending moment performance, the fatigue bending moment performance of the fillet rolling nodular cast iron crankshaft exceeds that of a forged steel nitriding crankshaft and approaches to the level of a forged steel quenching crankshaft, reliability can be ensured, and cost can be remarkably reduced.

The invention discloses a series-connected double-wire type combined welding wire for CO2 gas shield high-speed flat fillet weld. The series-connected double-wire type combined welding wire for the CO2 gas shield high-speed flat fillet weld comprises an antecedent electrode welding wire and a posterior electrode welding wire, the antecedent electrode welding wire and the posterior electrode welding wire are connected in series, the antecedent electrode welding wire is formed by a first steel-tape sheath and metal cored powder contained inside the first steel-tape sheath, the weight of the metal cored powder is 10-30% of the total weight of the antecedent electrode welding wire, the antecedent electrode welding wire is high in deposition rate, the quantity of generated slag is small in a welding process, and a small amount of added fluoride enables the electric arc to be more stable. The posterior electrode welding wire is formed by a second steel-tape sheath and welding flux powder contained inside the second steel-tape sheath, the weight of the welding flux powder is 10-30% of the total weight of the posterior electrode welding wire, the content of the diffusible hydrogen of deposited metal can be reduced to be lower than 5ml/100g through the posterior electrode welding wire, and CO released by combustion of an undercoat can be reduced by Al and Mg in the welding process. A small amount of titanium and boron are added in both the metal cored powder and the welding flux powder, and the impact value of the deposited metal can be improved greatly. When welding is carried out at the welding speed higher than 1.5m/min, the combined welding wire is excellent in welding process, and good paint resistant performance can be obtained.

The invention discloses a steel plate with excellent low-temperature toughness. The steel plate comprises the following chemical elements in percentage by mass: 0.02-0.15% of C; 0.10% to 0.5% of Si; 0.30% to 1.60% of Mn; 0.10% to 1.00% of Cr; 0.30% to 1.00% of Ni; 0.005% to 0.10% of Ti; 0-0.60% of Mo; 0.10% to 0.80% of Cu; 0.01% to 0.06% of Al; 0.003-0.06% of Nb, 0-0.08% of V, and 0 < N < = 0.035%; and the balance of Fe and other inevitable impurities. In addition, the invention also discloses a manufacturing method of the steel plate with excellent low-temperature toughness, which comprises the following steps: (1) smelting and casting; (2) heating; (3) rolling; and (4) cooling.

The invention discloses an all-position flux-cored wire for alkaline gas protection, which has both strong impact toughness and strong crack resistance and is suitable for protection of gas such as CO2 or CO2+Ar. The flux-cored wire is manufactured by drawing SPCC (steel plate cold commercial) steel strips or similar mild-carbon steel strips wrapping flux core in specific component proportion. By adopting an alkaline slag system, weld metal can be purified, hydrogen and oxygen contents of the weld metal can be reduced, so that excellent impact toughness and cracking resistance can be obtained. Desulphuration capacity of the alkaline slag system is utilized so as to further purify the weld metal and improve the cracking resistance.

The invention relates to a high-tenacity wear-resisting overlaying alloy welding wire for a cold-rolling support roller, and the overlaying alloy welding wire provided by the invention has excellent tenacity and suitable hardness. The alloy welding wire comprises the following chemical components by weight percent: 0.2-0.4% of C, 1.0-2.0% of Mn, 0.5-1.5% of Si, 3.0-6.0% of Cr, 0.5-2.0% of Mo, 1.0-3.0% of Ni, less than or equal to 0.02% of P, less than or equal to 0.01% of S, and impurities, wherein the impurities comprise mineral substances and alloy powder; the mineral substances, the content of which is 2-5%, comprises one or more than one of CaF2, CaCO3, Na3SiF6 and LiF2; the alloy powder, the total content of which is 0.3-2.0%, comprises one or more than one of vanadium, tungsten, niobium, titanium, aluminum, and the like; and 0.1-0.5% of rare earth is additionally added. The welding wire is matched with a suitable welding process, thereby acquiring the hardness of HRC (Rockwell hardness) 48-53. A low-carbon steel belt is used for wrapping the alloy powder and the mineral substances and then rolling and drawing are performed, thereby forming the welding wire. A reasonable component design is matched with HJ107, grains are refined and sulfur-removing components are added, so that the high-tenacity wear-resisting overlaying alloy welding wire is free from hot crack in an overlaying process, has the hardness and tenacity suitable for cold-rolling rollers, and meets the demand of overlaying a cold roller.

The invention discloses a low-alloy medium-silicon vermicular graphite cast iron glass mold material and a preparation method thereof. The low-alloy medium-silicon vermicular graphite cast iron glassmold material comprises, by mass, 87.5-92.12% of iron, 2.8-2.89% of silicon, 3.4-3.6% of carbon, 0.4-0.5% of manganese, 0.2-0.29% of chromium, 0.1-0.15% of vanadium, 0.08-0.1% of titanium, 0.4-0.5% ofnucleating agent and 0.5-0.6% of vermiculizer. Through the optimized formula, the oxidation resistance and wear resistance of a mold are greatly improved. Meanwhile, through the mutual cooperative effect of the added materials, the toughness, oxidation resistance and wear resistance of the glass mold are greatly improved. Thus, the service life of the mold is prolonged.

The invention discloses a high-toughness steel plate used in an extremely cold environment. The high-toughness steel plate comprises the following chemical elements in percentage by mass: 0.05-0.16% of C; 0.60%-1.2% of Si; 0.40% to 1.20% of Mn; 0.30% to 1.00% of Cr; 0.40% to 1.00% of Ni; 0.01% to 0.10% of Ti; 0% to 0.60% of Mo; 0.30% to 0.80% of Cu; 0.01% to 0.06% of Al; 0.003%-0.06% of Nb, 0%-0.08% of V and the balance Fe and other inevitable impurities. In addition, the invention also discloses a manufacturing method of the high-toughness steel plate, which comprises the following steps: (1)smelting and casting; (2) heating; (3) rolling; and (4) quenching and tempering. The high-toughness steel plate has the characteristics of high strength, high toughness, excellent weldability, good surface quality and stable whole plate performance.

The invention discloses a biopsy forcep head and a preparation method thereof. The biopsy forcep head comprises carbon, chromium, molybdenum, manganese, niobium, copper, silicon and iron. The preparation method includes the steps that alloy powder particles are prepared; the alloy powder particles and an organic matter binder are mixed to prepare feed; the feed is formed into a forcep head green body on an injection forming machine; the binder in the forcep head green body is removed to obtain a degreasing green body; and the degreasing green body of the forcep head is sintered, insulated andcooled and then the biopsy forcep head can be obtained. The material density of the forcep head prepared through the method is larger than 96%, the hardness is not lower than 480HV0.2, the tensile strength is not lower than 1000MPa, the impact value is higher than 10J/cm<2>, the dimensional accuracy of the product is +/-0.2%, and a neutral salt spray test is carried out for over 20h. Moreover, nonickel composition harmful to human bodies is contained in the forcep head material. By means of the biopsy forcep head and the preparation method thereof, high-efficiency and low-cost production of the biopsy forcep head can be achieved.

The invention provides an efficient grinding ball special for an environment-friendly mill of a cement plant and a manufacturing method of the efficient grinding ball and relates to the technical field of wear-resistant material production. The efficient grinding ball is characterized by comprising 1.9% to 3.1% of C, 0.3% to 0.9% of Si, 0.2% to 0.8% of Mn, 11.5% to 13.5% of Cr, not larger than 0.10% of S, not larger than 0.10% of P, 0.5% to 1.5% of Mo, 0.05% to 0.15% of V, 0.1% to 1.0% of Ti, 0.3% to 1.0% of Cu and the balance Fe. The method includes the following steps that firstly, raw materials are smelted at the temperature from 1490 DEG C to 1550 DEG C; secondly, constant-temperature casting is performed at the temperature from 1440 DEG C to 1500 DEG C; and thirdly, thermal treatment is performed, wherein the raw materials are heated at the temperature from 700 DEG C to 720 DEG C for 7 hours to 10 hours, the temperature is increased to 960 DEG C to 990 DEG C, and the raw materials are quenched for 7 minutes to 15 minutes in quenching oil at the temperature from 110 DEG C to 145 DEG C and annealed for 8 hours to 10 hours at the temperature from 330 DEG C to 380 DEG C. The efficient grinding ball is resistant to impact, long in service life and good in abrasion resistance, so that the efficient grinding ball adapts to the severe ball-milling working condition environment, and the HRC ranges from 60 to 65; the impact value is larger than or equal to 6.5 J/cm<2>; the fallen ball impact fatigue service life is larger than 40000 times; and strong corrosion and ultra-high temperature are resisted.

Provided is a prehardened steel material containing: 0.05≤C≤0.25 mass %, 0.01≤Si≤1.00 mass %, 0.40≤Mn≤1.80 mass %, 0.0002≤S≤0.3000 mass %, 0.30≤Cu≤1.80 mass %, 2.00≤Ni≤3.90 mass %, 0.05≤Cr≤3.20 mass %, 0.05≤Mo≤0.80 mass %, and 0.30≤Al≤1.50 mass %, with a balance being Fe and unavoidable impurities, in which the prehardened steel material has: a cross-sectional size of 350 mm or more in width and 350 mm or more in height, a hardness of 34 to 43 HRC, an average value of prior austenite grain size being 85 μm or less, and an average value of impact value being 18 J/cm² or higher.

The invention belongs to the technical field of welding rod preparation, and discloses a heat-resistant steel hand welding rod for ultra-supercritical CB2 steel and a preparation method thereof. The heat-resistant steel hand welding rod is composed of a special H08Cr9MoV alloy core wire (produced by Jiangsu Yonggang Group Co., Ltd.) with low content of impurities such as phosphorus and sulfur and a coating wrapping the surface of the special H08Cr9MoV alloy core wire. The main components of cladding metal are 9% of Cr, 1.5% of Mo, 1% of Co, 1% of Ni and 0.2% of V, and meanwhile, trace alloy elements such as Nb, N and B are added, so that the weld joint deposited metal has good mechanical properties, especially impact energy performance after heat treatment, and the impact energy is larger than or equal to 47J in a normal temperature state. The tensile strength of the deposited metal and a welding joint is 630-750MPa under the heat treatment condition of 730-740 DEG C and time of 12h. According to the hand welding rod manufactured by the method, electric arcs are stable in the welding process, splashing is small, welding slag is uniform in covering, slag removal is good, weld joint forming is attractive, all-position welding can be carried out, and the welding process performance is good.

The invention discloses a metal flux-cored wire containing Ti and B for carbon dioxide gas shielded welding. The metal flux-cored wire is suitable for backing welding of thick plates and high-speed flat fillet welding of high film thickness primer steel plates. According to the metal flux-cored wire, the weight of metal cored powder accounts for 10-30% of the total weight of the flux-cored wire, wherein a steel tape sheath comprises, by total weight percentage, 0.001-0.025% of C, 0.001-0.030% of Si, 0.01-0.35% of Mn, 0.001-0.030% of Al, 0.001-0.020% of P, 0.001-0.020% of S and the balance Fe; the metal cored powder comprises, by total weight percentage, 0.1-5.0% of fluoride, 0.01-0.5% of C, 8-20% of Mn, 2-8% of Si, 0.1-5.0% of Ti, 0.01-0.1% of B, 0.01-2.0% of Zr and the balance Fe. The metal flux-cored wire is less in splashing quantity and can achieve crack resistance the same as that of a solid welding wire when backing welding is carried out on the thick plates, excellent gas porosity resistance can be achieved when high-speed flat fillet welding is conducted on the primer steel plates coated with high film thicknesses of 30-40 microns, and deposited metal has good mechanical properties.