1501 results about "Hardenability" 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 provides 1,000 MPa cold-rolled hot-dip galvanized dual-phase steel and a manufacturing method thereof, belonging to the technical field of cold-rolled hot-dip galvanized high-strength steel plates. The chemical components in mass percentage of the cold-rolled hot-dip galvanized dual-phase steel are: 0.06 to 0.18 percent of C, less than or equal to 0.1 percent of Si, 1.2 to 2.5 percent of Mn,0.05 to 0.5 percent of Mo, 0.05 to 0.6 percent of Cr, 0.005 to 0.05 percent of Al, 0.01 to 0.06 percent of Nb, 0.01 to 0.05 percent of Ti, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.005 percent of N, the balance being Fe and inevitable impurities. The manufacturing method adopts Cr or Mo to replace Si, so as to enlarge an austenitic and ferritic two-phase region and improve the hardenability of the dual-phase steel, and meanwhile, the manufacturing method improves the strength of toughness of the steel by adding Nb or Ti refined grains, so as to ensure that the steel has good weldability and usability, and the strength grade of the steel can reach over 1,000 Mpa.

The invention discloses a steel plate for stamping and quenching and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.28 percent of C, less than 0.40 percent of Si, 0.4 to 2.0 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.016 to 0.040 percent of Al, 0.15 to 0.8 percent of Cr, 0.015 to 0.12 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of N, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps of: heating a blank to 1,150 to 1,250 DEG C, preserving heat for 2.5 to 4 hours and performing rough rolling, and then performing finish rolling under multichannel pressure and at the final rolling temperature of between 830 and 950 DEG C, performing laminar cooling, and cooling to the rolling temperature at the cooling speed of more than 10 DEG C/s and the rolling temperature of between 600 and 680 DEG C. The cold-rolled steel plate is obtained by the following steps of: performing cold rolling on a hot rolled steel strip, annealing through a pure hydrogen gas cover furnace, and oiling and packaging. The annealing temperature is 550 to 650 DEG C and the heat preserving time is 3 to 5 hours. The steel has a simple component design and high hardenability. The depth of a hardening layer of more than HRC45 is 10 to 16mm. The steel plate consists of ferrite and pearlite. After thermal stamping and quenching, an all-martensite structure can be obtained. The tensile strength is above 1,300N/mm<2>.

The invention relates to a centrifugal combined indefinite chill cast-iron roller and a preparation method thereof, pertaining to steel rolling technical field. The chemical composition of a roll barrel is (weight percent): 3.2-3.8 C, 3.8-4.5 Ni, 1.2-1.8 Cr, 0.2-0.4 Mo, 0.2-0.5Cu, 1.0-1.8 Si, <0.8Mn, 0.10-0.30 Nb, 0.05-0.20 V, 0.05-0.20 Ti, 0.04-0.07Mg, 0.02-0.05 Y, 0.01-0.03 Sb, and the rest are Fe and unavoidable microimpurity. The invention employs a electric stove to produce a roller, and the roller is moulded with centrifugal casting method; the roller is characterized by high strength and hardness, good toughness, hardness uniformity and hardenability, excellent wear resistance and oxidation resistance and the anti-cold shock and heat shock properties are also good; no phenomena like breaking, peeling, crazing and steel sticking are in the operation process; the service performance is apparently better than high nickel-chrome indefinite chill cast-iron roller; the processing technique is simple, high-heat treatment is not needed and the production cost is low. The invented roll has the advantages that: the rolling mill operating rate is significantly improved, the production cost of mill bar is reduced, the surface quality of the mill bar is improved and the economic and social benefits are good.

The invention discloses high-hardness-ductility low alloy abrasion-resistant steel with high hardness, good ductility, high work hardening capacity, favorable comprehensive mechanical property and hardenability. In the invention, as Nb, B and rear-earth elements are added, the high-hardness-ductility low alloy abrasion-resistant steel can be ensured to have better hardenability, better ductility, high initial hardness, high work hardening capacity and better abrasion-resistant performance, thereby enlarging the application of materials. The invention is suitable for preparing wearing parts, in particular to parts used for impacting wearing working conditions.

The invention discloses high-carbon-chromium bearing steel and a manufacture method thereof. The high-carbon-chromium bearing steel comprises the following chemical compositions by weight percentage: C: 0.90-1.05; Cr: 0.90-1.20; Mn: 0.90-1.25; Si: 0.45-0.75; Al: 0.02-0.04; oxygen is less than or equal to 0.0007; phosphorus is less than or equal to 0.010; sulfur is less than or equal to 0.005; titanium is less than or equal to 0.0025; copper is less than or equal to 0.15; nickel is less than or equal to 0.10; nitrogen is less than orequal to 0.0070; and the balance of unavoidable impurities and Fe. The manufacture method comprises the following steps: smelting in an electric furnace, refining in a ladle arc furnace, degassing in a vacuum furnace, pouring steel liquid into steel ingots, heating steel ingots in a heating furnace, rolling the steel ingots into square billets by a rolling mill, heating the steel ingots in a heating furnace and rolling the steel ingots into round steel by a rolling mill. Compared with the prior art, the invention has high hardenability, high crystal grain size of more than 8 grade, high commonality in technology and wide application.

The invention relates to carburizing alloy steel, and a preparation method thereof. The alloy of the carburizing alloy steel comprises, by mass, 0.15%-0.25% of C, less than or equal to 0.30% of Si, 0.30%-1.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.30%-1.50% of Cr, 2.80%-3.80% of Ni, 0.30%-1.00% of Mo, 0.01%-0.08% of Al, at least one selected from 0.05%-0.15% of V and 0.025-0.10% of Nb, and the balance being Fe and inevitable impurities. A mass percentage of V, Nb and Al meets an equation of V+Nb+Al <= 0.30%. The carburizing alloy steel provided by the invention has good anti-fatigue performance, excellent comprehensive properties, good hardenability, high yield ratio, extremely small internal oxidation and the characteristic of resisting grain growth at a high temperature, and is suitable for manufacturing heavy-duty gears.

The invention relates to a novel high strength and toughness titanium alloy which includes (by weight percent): 2.0-5.5 % of Al, 2.0-8.0 % of Mo and 2.0-6.0 % of V, wherein the ratio of Mo to V is 1/3-4. The titanium alloy contains 2.0-5.0 % of Cr or Cr and Fe (at most 0.9 % of Fe), the relationship k beta =CMo/11+CV/14.9+CCr/6.5+CFe/5 is satisfied and the value is 0.85-1.4. The titanium alloy also contains less than or equal to 0.10% of Si, less than or equal to 0.10% of O and less than or equal to 0.01% of H, the content of the rest components is controlled according to that of normal titanium alloy, and the allowance is Ti. The titanium alloy can also contain one or two of the neutral elements of Zr, Hf, Sn, each of which accounts for 0.15-3.5%. The titanium alloy has strong hardenability and good structure stability under high temperature, and segregation and fragile intermetallic compounds can be prevented. The titanium alloy has good pressure workability and welding property and has good tensile ductility and forgeability.

The invention discloses a production technology of a non-modulated plastic die steel thick plate. The production technology comprises the following steps: converter smelting and ladle furnace (LF) and Ruhrstahl Heraeus (RH) refining are adopted to pour a continuous cast billet; the heating temperature is 1150-1200 DEG C, the precision rolling temperature is 900-950 DEG C, the finish rolling temperature is 860-900 DEG C; the cooling control of the steel plate is performed after the steel plate is rolled, the phase transformation strengthening and the precipitation strengthening of the microalloyed carbon nitride are utilized to ensure that when the section of the steel plate is not modulated, the structure and performance are uniform along the section, the plastic die steel of which section hardness is 300-340 is obtained; the rolled steel plate is tempered to eliminate the stress and avoid sawing crack, the hardness of the steel plate is uniform after tempering, and the section has granular bainite structure. In the production technology, the alloy component is controlled, Ni is not added, a small amount of Mo, B and V are added and the Cr content is increased properly, thus the steel plate has higher hardenability; and the cooling control of the rolled steel plate is performed to ensure that the large-section steel plate has bainite structure. The production technology is suitable for the production of the non-modulated plastic die steel thick plate, which is prepared from the 320mm continuous cast billet and of which thickness is less than 120mm.

The invention discloses an alloy cast steel for a high speed train brake disc, a heat treatment method thereof and a high speed train brake disc manufactured by the alloy cast steel. The alloy cast steel is composed of the following components in percentage by weight: 0.18-0.26% of carbon, 0.16-0.50% of silicon, 0.55-1.40% of manganese, not larger than 0.03% of phosphorus, not larger than 0.03% of sulfur, 0.90-2.00% of chromium, 0.71-1.80% of nickel, 0.65-1.20% of molybdenum, 0.20-0.35% of vanadium, not larger than 0.30% of other components, smaller than 0.1% of tungsten and the balance of ferrum; and the heat treatment method comprises two steps of normalizing and tempering. The alloy cast steel disclosed by the invention has the beneficial effects that such alloy elements as manganese, nickel, chromium, molybdenum, vanadium, and the like, and such main components in the cast steel material as carbon, silicon and the like are reasonably mixed and are effectively thermally treated to refine the crystalline grain and improve the hardenability and heat resistant properties of the alloy cast steel material, and the normal temperature strength and the high temperature strength are greatly improved, so that the alloy cast steel material has excellent comprehensive mechanical properties. A brake disc manufactured by the alloy cast steel can meet the application requirements of high speed trains.

The invention discloses a safety evaluating method of pressure equipment containing crack defects, which comprises the following steps: 1, carrying out nondestructive testing and a standard stretching experiment; 2, obtaining a fully plastic solution factor h1 corresponding to the hardenability value n of different materials, and computing 1n(h1/h1(n=1)), wherein h1(n=1) is the value of h1 when nis equal to 1; 3, drawing a relationship curve between (h1/h1(n=1)) and n, fitting the relation curve into a linear relationship, recording the slope rate as B, and computing a defect size influence factor phi according to the formula phi=exp(-B), wherein exp presents an exponential function using a natural logarithm e as a base index; 4, establishing a failure evaluating curve and computing the positions of discontinuities; and 5, determining the plastic damage extent L'r and the fracture failure extent K'r of the pressure equipment, and judging the safety state of the pressure equipment containing the crack defects. In the method of the invention, the influence of the defect size factor phi to the safety is considered so that the evaluation is more accurate; phi is not limited by the material parameter n so that the invention can be simply and easily used for computing any materials.

The invention relates to bainite pre-hardening plastic mold steel and a preparation method and a heat treatment method thereof. Chemical components of the steel are optimized on the basis of P20 steel, the content of manganese (Mn) is appropriately increased, the content of the chromium (Cr) and molybdenum (Mo) is reduced, little niobium (Nb) is added, and no nickel (Ni) and vanadium (V) in expensive price are not contained. The preparation method of the plastic mold steel comprises the following steps of: compounding, smelting and casting; carrying out the multi-directional forging heat machining; carrying out the wind cooling and the air cooling; and finally carrying out the tempering heat treatment. The plastic mold steel has characteristics of large cross section, low cost, high hardenability, good hardness uniformity and the like and also has low susceptibility of flake formation, a diffusion hydrogen annealing process is omitted, in addition the post-forging normalizing is adopted to substitute a thermal refining process, so that the production period is greatly shortened, the domestication of the plastic mold steel with large cross section, long service life, top quality and short period can stride forward for a large step, and the existing domestic manufacturing concept of energy conservation, emission reduction, sustainability and economical type can be met.

The invention relates to a composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof, belonging to the technical field of the steel rolling. The composite roll comprises a roll external layer and a roll core. The chemical components of the materials of the roll external layer in terms of the percentage by weight are as below: 25-28 of alloy scrap iron of a high-nickel-chromium infinite chilled iron roll, 28-30 of carbon ferrochrome, 1.5-2.5 of mid-carbon ferromanganese, 2.5-3.5 of ferroboron, 0.5-0.8 of silicon-calcium-barium alloy, 0.2-0.4 of aluminum, 0.3-0.5 of ferrotitanium, 0.2-0.4 of rare earth ferrosilicon, 0.10-0.15 of zinc, 0.15-0.18 of magnesium and the balance of low-carbon waste steel sheet. The roll core is high-strength alloy cast iron or low-alloy ductile cast iron. The roll external layer and the roll core are formed through centrifugal composite casting. The roll has low production cost, contains a small number of impurities and has high degree of purity; the hardenability, the mechanical performance and the thermal fatigue of the roll can be improved; and the roll has long service life and low production cost.

An aluminum alloy sheet of specific Al-Mg-Si composition, which, owing to preliminary aging treatment under adequate conditions, has a specific metallographic structure in which there are a large number of clusters of specific size (each being an aggregate of atoms) expressed in terms of number density, which, when observed under a transmission electron microscope of 1,000,000 magnifications, appear as dark contrast in the bright field image. It is superior in paint baking hardenability and is invulnerable to room temperature aging during storage for a comparatively long period of 1 to 4 months.

Steel contains each of C, Si, Mn, P, S, Al, N, O, at a range from ⅛ thickness centered around a ¼ sheet thickness from a surface to ⅜ thickness centered around the ¼ sheet thickness from the surface at a base steel sheet, a structure of the base steel sheet contains, in volume fraction, 3% or more of a retained austenite phase, 50% or less of a ferrite phase, and 40% or more of a hard phase, average dislocation density is 5×10¹³/m² or more, solid-solution C amount contained in the retained austenite phase is in mass % 0.70 to 1.00%, X-ray random intensity ratio of FCC iron in an texture of the retained austenite phase is 3.0 or less, ratio between a grain diameter relative to a rolling direction and a grain diameter relative to a sheet width direction of the retained austenite phase is 0.75 to 1.33.

The invention relates to steel which is provided with ultra-fine grains and used for hot stamping forming, a manufacturing process of the steel, a hot stamping forming process and a hot stamping forming component. The steel comprises, by weight, 0.27%-0.40% of C, 0.2%-3.0% of Mn, 0.11%-0.4% of V, 0-0.8% of Si, 0-0.5% of Al, 0-2% of Cr, 0-0.15% of Ti, 0-0.15% of Nb, 0-0.004% of B, less than 2% of the total content of Mo, Ni, Cu and other alloy elements beneficial to improve the hardenability of the steel and other impurity elements.

The invention relates to a carbon-manganese composite microalloyed steel for engineering machinery and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.32-0.37% of C, 0.15-0.30% of Si, 1.20-1.40% of Mn, 0.030% or less of P, 0.030% or less of S, 0.0005-0.0030% of B, 0.10-0.60% of Cr, 0.01-0.07% of Al and the balance Fe and trace impurities,wherein the content of available boron in the steel is not less than 95%. The invention also provides a preparation method of the composite microalloyed steel and the method controls the ratio of Ti to N to be 3-6 and the acid soluble aluminium content to be 0.030-0.050% so as to ensure that boron in the steel is almost available boron. The preparation method of the invention controls the contentof trace element boron and ensures the hardenability of steel so that the steel is suitable to be used for the preparation of important mechanical parts.

The invention belongs to the technical field of alloy steel, and in particular, relates to a manufacturing method of Mn-Cr gear steel. The gear steel comprises the following components: 0.17-0.22% of C, 0.15-0.25% of Si, 1.10-1.40% of Mn, 1.00-1.30% of Cr, Mo not more than 0.08%, B not more than 0.0005%, Cu not more than 0.02%, Ni not more than 0.02%, 0.025-0.055% of Al, P not more than 0.015%, 0.020-0.035% of S, N not more than 130 ppm, and the balance of iron. The method improves the cleanness of molten steel through optimizing the refining process and the slag system control, performs the nitrogen adding treatment through a wire feeding procedure to effectively refine grains of the aluminum deoxidation gear steel, realizes precise control of hardenability alloy elements, solves the deoxidation and sulfur maintaining contradiction, and guarantees excellent pouring performance of the molten steel and excellent cutting performance of the gear steel.

The invention discloses a rolling method of low-banded structure gear steel. The method comprises the following steps of: (1) heating a steel blank within a three-section type heating furnace; (2) carrying out dephosphorization on the heated steel blank by high-pressure water, and sequentially carrying out rough rolling, intermediate rolling, water cooling, and finish rolling; (3) water-cooling and air-cooling the finish-rolled steel blank sequentially; and (4) slowly cooling the cooled round bar steel to be lower than 200DEG C after shearing. Due to the use of the rolling method, the production technology difficulty that the level of the high-end hardenability carburized gear steel banded structure is hard to lower due to the conventional rolling technology can be overcome, so that that the level of the banded structure of the gear steel is lowered to be lower than 1.0 grade from 3.0 grade of the conventional rolling technology, and therefore, the aim of prolonging the fatigue life of the gear can be achieved. The rolling method further has the characteristics of being simple in technical route, low in production cost, high in operability and the like.