5086 results about "Impact toughness" patented technology

The present invention provides a weather resistant steel plate, which comprises components of, by mass percent, 0.02 to 0.10 of C, 0.10 to 0.40 of Si, 1.0 to 1.6 of Mn, less than or equal to 0.025 of P, less than or equal to 0.015 of S, 0.20 to 0.50 of Cu, 0.30 to 0.60 of Cr, 0.10 to 0.50 of Ni, less than or equal to 0.40 of Mo, less than or equal to 0.060 of Nb, less than or equal to 0.060 of V,0.010 to 0.035 of Ti, less than or equal to 0.0030 of B, less than or equal to 0.0050 of Ca, 0.015 to 0.050 of Al, and the balance Fe and other unavoidable impurities. Correspondingly, the present invention also provides a manufacturing method of the weather resistant steel plate. Through reasonable distribution ratio of alloy components, the method provided in the invention can obtain a high-strength and high-toughness weather resistant steel plate with good corrosion resisting performance, high yield strength and tensile strength, and excellent low temperature impact toughness. The steel plate also possesses good weldability, being able to carry out welding without preheating or employ lower preheating temperature welding. The steel plate provided in the invention can be widely applied to large-scale steel structure engineering such as building structures, bridges, etc.

Disclosed is a low alloy steel drug core welding wire used in the carbon dioxide arc welding. The components of the drug core and the content occupying the total weight of the welding wire(percent ratio) are as following: Ti01 3-6, Si 0.3-0.5, Mn 1.5-3.2, Si02 0.1-0.8,Zr02 0.1-0.5, Fe 2-7, Al plus Mg 0.5-1.2, Ni 0.5 -5, B 0.002-0.015, Ti 0.1-0.3; oxide or fluoride of alkali metal K, Na and Li is converted into the content of K, Na and Li, that is, 0.1-0.35; the content of fluoride F is 0.05-0.2; fluoride or oxide of rare earth metal is converted into the content of the rare earth metal, that is, 0.005-0.2; the product of the contents of C, Si and Mn in the welding wire is 0.058-0.11. The invention has good process property for the whole position welding of high strength low alloy steel, and can keep good stability of electric arc and welding operating property in the conditions of large current and fast-speed welding with smooth welding seam, high connecting intensity, good impact toughness minus 40 DEG C low temperature and good crack resistance.

The invention discloses a manufacturing method of a multilayer shell-core composite structural part, which comprises the following steps of: (1) respectively preparing feed for injection forming of a core layer, a transition layer and a shell layer, wherein powder in the feed of the core layer and the powder in the feed of the shell layer are selected from one or a mixture of some of metal powder, ceramic powder, or toughened ceramic powder and are different from each other, and the powder in the feed of the transition layer is gradient composite powder; (2) respectively manufacturing blanks of the multilayer shell-core composite structural part layer by layer with a powder injection forming method; (3) degreasing the blanks; and (4) sintering the blanks to obtain the multilayer shell-core composite structural part. The multilayer shell-core composite structural part is manufactured with the powder injection forming method, and has the advantages of high surface hardness, abrasion resistance, uniform thickness of the shell layer, stable and persistent performance, strong binding force between the shell layer and the core layer due to the transition layer, good integral bending strength and good impact toughness and is difficult to crack.

The invention provides a hot rolled steel plate with excellent low-temperature toughness for a thick submerged pipeline and a production method of the hot rolled steel plate. The hot rolled steel plate comprises the following chemical components by weight percentage: 0.02%-0.07% of C, 0.15%-0.40% of Si, 1.0%-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.003% of S, less than or equal to 0.06% of Nb, less than or equal to 0.025% of Ti, less than or equal to 0.06% of V, less than or equal to 0.20% of Mo, less than or equal to 0.25% of Cu, 0.10%-0.30% of Ni, less than orequal to 0.25% of Cr, less than or equal to 0.008% of N, 0.010%-0.040% of Al, more than or equal to 2 of Al/N and the rest Fe and inevitable impurities. According to the steel for the submerged pipeline with the thickness being over 28mm, disclosed by the invention, the transversal and longitudinal bending strength can reach over 480MPa or 510MPa, the transversal and longitudinal tensile strengthcan reach over 560MPa or 600 MPa, the transversal impact toughness at the temperature of 60 DEG below zero is larger than or equal to 400 J, the transversal DWTT (Drop-Weight Tear Test) shearing areaat the temperature of 25 DEG C below zero is larger than or equal to 85%, simultaneously, the corrosion resistant of the steel plate is excellent, and the result of a 96-hour HIC (Hydrogen Induced Cracking) test conforms to the requirements of the standard 0284 of the NACE (National Association of Corrosion Engineers). The hot rolled steel plate is suitable to be as a raw material for manufacturing a pipeline for submerged oil and gas transmission.

The invention relates to high strength easily forming atmospheric corrosion resistant steel. The invention provides the high strength easily forming atmospheric corrosion resistant steel aiming at the problems in existing steel that the weatherability is bad and the service life is lowered under the condition that the thickness is thinned. The high strength easily forming atmospheric corrosion resistant steel is composed of components of following weight percent: C: 0.04-0.09%, Si: 0.10-0.50%, Mn: 1.20-1.70%, P: <=0.020%, S: < =0.010%, Cu: 0.20-0.60%, Cr: 0.40-0.80%, Ni: 0.20-0.50% and Nb: 0.03-0.07%, and also comprises one or a plurality of Mo: <=0.20%, Ti: <=0.03% and Als: <=0.035%, and allowance is Fe and unavoidable impurity. The yield strength of the steel of the invention is more than or equal to 550MPa, the tensile strength is more than or equal to 650MPa, the percentage elongation is more than or equal to 18%, the corrosion resistance is equivalent to SPA-H steel which is used for previous containers, and the steel has excellent welding performance, cold roll forming performance and low temperature impact toughness, which is beneficial for extending and applying.

The invention relates to a tough-elastic material based on starch, which on the one hand has high impact toughness at low humidities, and on the other hand still has a high modulus of elasticity at high humidities and has a high elongation capacity in a broad range of humidities and on account of its property profile is suited to use as moulded elements such as for example for foils, films, fibres, injection-moulded articles, in particular as edible film and for the packaging of active ingredients, chemicals, aromas and perfumes as well as high-quality substitution of gelatine in the area of soft and hard capsules. The tough-elastic material can be obtained transparent and adjusted such that it dissolves on swelling in water or respectively disintegrates or remains intact.

The X65 pipeline steel for use in acid condition consists of C 0.02-0.05 wt%, Mn 1.20-1.50 wt%, Si 0.10-0.50 wt%, S not more than 0.0020 wt%, P 0.004-0.012 wt%, Nb 0.05-0.07 wt%, Ti 0.005-0.025 wt%, Mo 0.050-0.195 wt%, Cu not more than 0.35 wt%, Ni not more than 0.35 wt%, N not more than 0.0080 wt%, Ca 0.0015-0.0045 wt% and Ca/S not less than 2.0 except Fe. Its making process includes the following steps: smelting in a converter or an electric furnace; secondary steel making including LF desulfurizing + RH vacuum deairing and Ca treatment; continuous casting; rolling with initial rolling termination temperature of 940-1020 deg.c and finish rolling termination temperature of 780-840 deg.c; and winding at 500-580 deg.c. The X65 pipeline steel has low manufacture cost, high HIC resistance, high dynamic tear resistance and high impact toughness.

Embodiments of the present disclosure are directed to methods of manufacturing steel tubes that can be used for mining exploration, and rods made by the same. Embodiments of the methods include a quenching of steel tubes from an austenitic temperature prior to a cold drawing, thereby increasing mechanical properties within the steel tube, such as yield strength, impact toughness, hardness, and abrasion resistance. Embodiments of the methods reduce the manufacturing step of quenching and tempering ends of a steel tube to compensate for wall thinning during threading operations. Embodiments of the methods also tighten dimensional tolerances and reduce residual stresses within steel tubes.

The invention relates to a high strength wear resistant steel plate, which comprises the following chemical components by weight percentage: 0.12 to 0.16 percent of C, 0.10 to 0.70 percent of Si, 0.90 to 1.50 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.05 to 0.30 percent of Ni, 0.03 to 0.08 percent of V, 0.01 to 0.06 percent of Nb, 0.020 to 0.08 percent of Al, 0.20 to 0.70 percent of Cr, 0. 1 to 0.50 percent of Mo, 0.010 to 0.060 percent of Ti, 0.0005 to 0.0030 percent of B, and the balance being Fe and inevitable impurities. The steel plate manufactured through reasonable design of alloy components and main control of quenching and temper processes has the thickness of 60mm, ball hardness number between 360 and 440, even hardness distribution, tensile strength not less than 1,220MPa, good welding performance, good cold bending performance, good impact toughness, excellent steel plate shape, and wide application prospect, and can be widely applied to engineering machinery manufacturing.

The invention relates to ultrahigh-malleability tunnel supporting anchor pile steel of converter continuous cast billet and a production method, which belongs to the technical field of a mine anchor rod. The anchor rod steel comprises the following components by weight percent: 0.5 to 0.70 percent of carbon, 0.15 to 1.20 percent of silicon, 0.5 to 2.5 percent of manganese, less than or equal to 0.045 percent of phosphorus, less than or equal to 0.045 percent of sulfur, 0 to 1.00 percent of chrome, 0 to 1.00 percent of nickel, 0 to 1.00 percent of molybdenum, 0 to 0.30 percent of copper, 0.03 to 0.40 percent of vanadium, 0.01 to 0.2 percent of aluminum, 0 to 0.10 percent of titanium, 0 to 0.10 percent of boron, 0.001 to 0.0 percent of niobium, 0.004 to 0.020 percent of nitrogen, and iron for the surplus; the yield strength Rel is larger than or equal to 600 MPa, the percentage elongation delta 5 is larger than or equal to 20 percent, the impact strength is 20 DEG C, Akv is larger than or equal to 27 J, and the breaking load is larger than or equal to 300 KN. By adopting the production process flow of converter crude metallurgy, LF furnace fine metallurgy and full protection continuous casting, the steel grade has the advantages that the purity is high, the structure is dense, the grain is fine, the physical chemistry properties of the steel are stable, the over-all mechanical property is good, the production operation and process flow are simple, and the rolled metal finished product can be directly used without heat treatment to the rear part.

The invention discloses wind power flange alloy steel and a preparation technology of parts thereof. The alloy steel comprises the following chemical compositions: carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, vanadium, nickel, copper, nitrogen, oxygen, hydrogen, rare earth and the balance of iron and the inevitable impurities. The preparation technology of the alloy steel parts comprises the following steps: pretreating molten iron, smelting in a converter, performing external refining, casting steel ingots, performing flame cleaning, heating, forging, slowly cooling, performing heat treatment, machining, performing flaw detection, inspecting, packaging and warehousing. Compared with the existing alloy steel used in the wind power generation at home and aboard, the alloy steel disclosed by the invention has higher tensile strength, yield strength, elongation after fracture and reduction of area, particularly higher low-temperature impact toughness. The atmosphere corrosion resistance and the sea atmosphere corrosion resistance are increased by two levels.

The invention relates to nylon engineering plastics and a manufacture method thereof, in particular to nylon engineering plastics for high-speed transit railway tracks and a manufacture method thereof. The nylon engineering plastics comprise the following components in percentage by weight: 35 to 60 percent of nylon resin, 20 to 35 percent of glass fibre, 0 to 10 percent of inorganic mineral, 16 to 30 percent of compatilizer, 0.3 to 0.5 percent of light stabilizer, 0.1 to 0.3 percent of coupling agent, 0.1 to 0.5 percent of antioxygen and 0.4 to 1 percent of lubricant, wherein the compatilizer is one kind of or a mixture of two kinds of Maleic anhydride grafted EPDM (Ethylene Propylene Diene Monomer) rubber and maleic anhydride grafted POE (Polyolefin Elastomer), and the melt flow rate of the compatilizer is 0.5 to 1.5g/10min. The manufacture method comprises the steps of: adding the compatilizer into an extruder in a lateral feeding addition method under the condition that the melt temperature is 220 to 280 DEG C and the mixing time is 1-5min; and controlling the rotate speed of a screw between 300 and 450rpm. According to the invention, the tensile strength, the impact toughness and the size stability can all meet the requirements for the operation of high-speed trains with running speed more than 300km/h.

The invention relates to the field of bamboo production, in particular to recomposed bamboo board producing process. The recomposed bamboo board producing process uses renewable bamboo as raw materials, the utilization rate of bamboo is high and can reach more than 90%, and resource waste is reduced. The density of recomposed bamboo boards manufactured in the recomposed bamboo board process is high as 1200kg/m<3> and is more than 1.6 times of the density of ordinary bamboo floors. The recomposed bamboo boards have the advantages of being high in hardness, high in strength, high impact toughness and wearproof. The recomposed bamboo boards manufactured in the recomposed bamboo board producing process further have the advantages of being capable of resisting to water absorption, free of deformation and the like. Tests show that the thickness expansion rate is only 0.4% after the recomposed bamboo boards absorb water for 24 hours and is far better than and smaller than the European standard of 2.0%. The free formaldehyde emission of the recomposed bamboo boards manufactured in the recomposed bamboo board producing process is below 0.4mg/L, so that harm of formaldehyde to people is reduced.

The invention provides ultra-strength, high toughness and low yield ratio steel, which comprises the following chemical components: 0.05 to 0.12 weight percent of C, 0.15 to 0.50 weight percent of Si,1.0 to 1.5 weight percent of Mn, less than or equal to 0.025 weight percent of P, less than or equal to 0.015 weight percent of S, 0.20 to 0.50 weight percent of Cu, less than or equal to 0.25 weightpercent of Ni, 0.015 to 0.05 weight percent of Nb, 0.015 to 0.045 weight percent of V, 0.010 to 0.050 weight percent of Ti, less than or equal to 0.55 weight percent of Cr, less than or equal to 0.30weight percent of Mo, 0.015 to 0.05 weight percent of Al and the balance of Fe and inevitable impurities. The invention also provides a steel plate manufactured by using the ultra-strength, high toughness and low yield ratio steel and a manufacturing method thereof. The steel plate has excellent mechanical property, has a yield strength of more than or equal to 460 Pa and a yield ratio of less than or equal to 0.80. Moreover, the steel plate has good low-temperature impact toughness and weldability, and is suitable for high steel-structure buildings and other large-scale steel structure fields with low yield ratio requirements.

The invention discloses a postweld heat treatment method of a welded joint of a bainite steel rail. The postweld heat treatment method comprises the following steps: carrying out primary cooling on the welded joint of the bainite steel rail to be cooled obtained by welding to a first temperature, then heating the welded joint subjected to primary cooling to a second temperature, and carrying out secondary cooling, wherein the first temperature is not higher than 450 DEG C, and the second temperature is higher than the first temperature and is not higher than 510 DEG C. The postweld heat treatment method of the welded joint of the bainite steel rail, which is disclosed by the invention, is simple to operate and capable of obviously improving the impact toughness of the welded joint of the bainite steel rail and reducing the content of a martensitic structure in the welded joint of the bainite steel rail, thus the safe operation of railways is ensured.

The invention relates to a low water absorption polyamide composite and preparation method thereof. 10-90 parts by weight of polyamide and 3-10 parts by weight of phyllo-silicate clay and less than 2 parts by weight of additive are placed into a high speed mixer to be premixed for 20min and then are added into a double screw extrusion machine, and conveying, melting, cutting, extrusion, cooling and granulation are carried out, thus obtaining polyamide/phyllo-silicate master batch, then the polyamide/phyllo-silicate master batch, 10-60 parts by weight of styrene resin, 2-10 parts by weight of compatilizer and 5-20 parts by weight of short glass fiber are placed into the high speed mixer to be premixed for 20min, temperature is controlled to be 40-60 DEG C, and finally extrusion granulationis carried out in the double screw extrusion machine, thus obtaining the low water absorption polyamide composite. Compared with prior art, the invention has the advantages of solvent resistance, high tenacity and easy processability of polyamide and the advantage of low water absorption of ABS resin; besides, phyllo-silicate clay speeds up crystallization of nylon, degree of crystallization and mechanical strength are improved, extremely low water absorption is obtained, and size stability is greatly improved while impact toughness is maintained.

The invention relates to an alloy for a cutter ring of a disk type hobbing cutter, which comprises the following components in percentage by mass: 0.4-0.46% of C, 0.45-1.0% of Si, 0.48-0.74% of Mn, 1.3-5.4% of Cr, 0.4-1.4% of Mo, 0.86-1.33% of V, 0.06-0.54% of Nb, 0-0.05% of Al, 0-3% of Ni, no more than 0.009% of S, no more than 0.03% of P and the balance of Fe. The preparation method comprises the following steps: performing vacuum induction smelting on the raw materials, casting, forging, performing spheroidal annealing, performing gas carburization, performing vacuum quenching, and performing double tempering. The carburized layer of the prepared cutter ring of a disk type hobbing cutter is 1mm thick, the surface hardness of the carburized layer can be up to 60-63HRC, the internal average hardness is higher than 55HRC, and the impact toughness aku is up to 15-22J/cm<2>; and the shield cutter ring is high in hardness and favorable in toughness.

The invention discloses a low-cost steel plate for a building structure and a manufacturing method thereof. The steel plate comprises the following chemical components: C accounts for 0.14 percent to 0.17 percent, Si accounts for 0.20 percent to 0.50 percent, Mn accounts for 1.30 percent to 1.50 percent, P is equal to or less than 0.012 percent, S is equal to or less than 0.005 percent, Alt accounts for 0.020 percent to 0.060 percent, and the balances are Fe and unavoidable foreign impurities. (1) No noble metal elements such as Nb, V, Ti, Ni, Cr, Mo and the like, are added in the steel, the requirement of Q345GJ strength level is met completely though the chemical components C-Si-Mn-Al, and the cost is low; (2) the steel is purer, P is equal to or less than 0.012 percent, and S is equal to or less than 0.005 percent; (3) the impact toughness is good at the temperature of minus 40 DEG C, and the Charpy impact energy of a V-shaped notch is equal to or higher than 80 J; (4) the earthquake resistance is good, and the actual yield ratio is respectively smaller than 0.78; and (5) the lamellar tearing resistance is excellent, and the actual Z-direction section shrinkage ratio in the total-thickness direction is equal to or higher than 38 percent. The hot-rolling Q345GJEZ35 steel plate used for the building structure and provided with thickness of 20-90 mm can be produced, and the steel plate and the manufacturing method can be applied to the manufacture of the steel structure of the high-rise building, have good comprehensive performance and simple production process, can realize the batch production and have low cost.

The invention provides a TMCP ocean structure thick plate and a method for manufacturing the same. The thick plate comprises the following chemical components: 0.015 to 0.18 weight percent of C, 0.5 to 2.0 weight percent of Mn, less than or equal to 0.6 weight percent of Si, less than or equal to 0.003 weight percent of S, less than or equal to 0.015 weight percent of P, 0.015 to 0.120 weight percent of Nb, 0.00 5 to 0.030 weight percent of Ti, less than or equal to 0.060 weight percent of Al, less than or equal to 0.010 weight percent of Ca, 0.003 to 0.010 weight percent of N, 0.001 to 0.006 weight percent of O, and the balance of Fe and inevitable impurities. The micro alloying design and TMCP rolling process control ensure the thick plate has a less than 120 J low-temperature impact toughness at a temperature of between 20 DEG C below zero and 40 DEG C below zero. Moreover, the thick plate has good welding performance and can be widely used for manufacturing D40 and E40 hull structures and ocean platforms.

The invention relates to a lining plate of cast steel with high strength and abrasion resistance and the fabrication method, belonging to the technical field of metal abrasion-resistant material. The chemical composition of the lining plate (in weight ratio) is that: 0.25 to 0.45 C, 1.0 to 2.0 Mn, 0.8 to 1.5 Cr, 0.003 to 0.008 B, 0.02 to 0.08 Al, 0.04 to 0.15 Ti, 0.02 to 0.10 La, 0.02 to 0.10 Ce, 0.02 to 0.08 Ba, 0.02 to 0.10 Ca and Fe and other inevitable micro impurity retaining; wherein, the sum of Si, Mn and Cr is more than 3.5 and lower than 4.5, while the sum of the La and Ce is more than 0.05 and lower than 0.18. The lining plate of cast steel can be fabricated with an electric stove and a method of sand sell molding. Therefore, the tensile strength of the lining plate is as high as to 1450 to 1600 MPa, the hardness reaches to 50 to 55 HRC; the abrasion resistance is good; and the impact toughness reaches 65 to 80 J/cm2. The lining plate can neither fracture nor peel in use, with much better service performance than the Mn13 high manganese steel lining plate. With the steel cuttings adopted as the main materials, the lining plate has the advantages of simple fabricating technique, low manufacturing cost, and can improve the operating efficiency of ball mill and lower the material-grinding cost, therefore is possessed with good economic benefit.