230results about How to "Improve hardenability" patented technology

The invention provides low-yield-ratio super-thick maritime work steel with excellent core low-temperature toughness and a manufacturing method of the low-yield-ratio super-thick maritime work steel, and belongs to the field of steel and iron material preparation. The low-yield-ratio super-thick marine steel with the excellent core low-temperature toughness comprises the following chemical components in percentage by mass: 0.10%-0.15% of C, 0.35%-0.45% of Si, 1.20%-1.50% of Mn, 3.00%-3.50% of Ni, 0.30%-0.50% of Mo, 0.15%-0.3% of Cr, 0.01%-0.02% of Ti, 0.030%-0.040% of V, 0.050%-0.060% of Nb, 0.0016%-0.0020% of B, 0.15%-0.25% of Cu, 0.060%-0.070% of Al, less than or equal to 0.010% of P, less than or equal to 0.004% of S, less than or equal to 0.39% of CET and the balance of Fe and inevitable impurities. According to the invention, a component design thought of a low-C, Ni-Nb-Mo-Al-B system is adopted, and a three-section rolling and quenching and tempering heat treatment process is combined. Through strict control of smelting continuous casting, controlled rolling and controlled cooling processes and quenching and tempering heat treatment parameters, the super-thick marine steel with excellent comprehensive mechanical properties is successfully prepared. The steel shows good low-temperature toughness in the core part, and meanwhile, the steel has a relatively low yield ratio. According to the low-yield-ratio super-thick maritime work steel with the excellent core low-temperature toughness, the thickness range is 80-150 mm, the yield strength is larger than or equal to 690 MPa, the tensile strength is larger than or equal to 920 MPa, the percentage elongation after fracture is larger than or equal to 20%, the yield ratio is smaller than or equal to 0.77, and the impact energy KV2 at the temperature of-60 DEG C is larger than or equal to 80 J.

The invention discloses high-toughness cold-rolled dual-phase steel, a preparation method thereof and an automobile part, and belongs to the technical field of alloy production. The high-toughness cold-rolled dual-phase steel comprises the following chemical components in percentage by weight: 0.15%-0.35% of C, 0.10%-0.50% of Si, 0.50%-4.00% of Mn, less than or equal to 0.5% of Mo, Nb, Ti and V, and the balance of Fe and impurity elements, the matrix structure of the dual-phase steel is long lath ferrite and martensite. The high-toughness cold-rolled dual-phase steel with the chemical components and the matrix structure has excellent toughness while having ultrahigh strength, the reaming and cold bending properties of the dual-phase steel are effectively improved, and the high-toughness cold-rolled dual-phase steel can be applied as an excellent automobile part. The preparation method of the high-strength and high-toughness cold-rolled dual-phase steel comprises the following step of preparing raw materials according to preset chemical components of the high-strength and high-toughness cold-rolled dual-phase steel. The method is simple, easy to operate and suitable for industrial production.

The invention discloses hot stamping die steel with high thermal conductivity. The hot stamping die steel comprises the following components: 0.30-0.35% of C; 0.03 to 0.15% of Si; mn: 0.05 to 0.20%; 0.10% to 0.30% of Cr; 3.00% to 3.30% of Mo; 1.10% to 1.30% of W; 2.00% to 2.30% of Ni; 0.70% to 0.90% of Co; 0.15% to 0.20% of Cu; 0.001% to 0.002% of Ce; la: 0.0005% to 0.001%; and the balance of Fe and impurities. According to the method, V is not used, meanwhile, the content of alloy elements such as Si and Cr is greatly reduced, the heat conductivity of steel is improved, the content of elements such as Mo, Ni, Cu, W, Co, La and Ce is improved, the purpose of age hardening is achieved, a special age hardening heat treatment process (namely a solid solution and age hardening mode) is combined, the hardness of the produced hot stamping die steel reaches 47-49 HRC, and the hardness of the produced hot stamping die steel is greatly improved. And the high-temperature strength, the high-temperature wear resistance and the high-temperature thermal fatigue performance of the material are greatly improved.

The invention discloses a 125KSi-grade high-strength corrosion-resistant seamless steel tube and a production method thereof, and belongs to the technical field of seamless steel tubes, the 125KSi-grade high-strength corrosion-resistant seamless steel tube comprises the following main chemical components in percentage by weight: 0.20-0.25% of C, 0.17-0.37% of Si, 0.30-0.40% of Mn, 2.00-4.00% of Cr, 0.20-0.30% of W, 0.10-0.20% of V, 0.010-0.030% of Nb, 50-0.70% of Mo, 0.0005-0.0015% of B, 0.020-0.040% of Al, 0.015-0.025% of Ti, 0.0010-0.0020% of Ca and 0.0003-0.0005% of Mg. The seamless steel tube is excellent in mechanical property and good in corrosion resistance, and can be The seamless steel pipe is a 125KSi-grade high-strength corrosion-resistant seamless

The invention discloses pipeline steel for carbon dioxide conveying and a production method thereof, and relates to the technical field of steel production, and the pipeline steel comprises the following chemical components in percentage by mass: 0.03%-0.07% of C, 0.10%-0.40% of Si, 1.00%-1.40% of Mn, less than or equal to 0.013% of P, less than or equal to 0.0020% of S, 0.030%-0.070% of Nb, less than or equal to 0.010% of V, 0.008%-0.030% of Ti, 0.20%-0.40% of Cr, 0.10%-0.30% of Ni, 0.05%-0.15% of Mo, less than or equal to 0.010% of Cu, 0.015%-0.055% of Al, less than or equal to 0.00050% of B, 0.0006%-0.0030% of Ca, less than or equal to According to the invention, a structure form taking bainite as a main component is realized, and the performance requirement of a product is met.

The invention discloses hot rolled steel for a 500MPa-grade high-ductility hollow anchor rod welded pipe as well as a preparation method and application of the hot rolled steel, and belongs to the technical field of hot continuous rolling plate strip production. The hot rolled steel for the 500MPa-grade high-ductility hollow anchor rod welded pipe is prepared through smelting, casting blank heating, rough rolling, coiling of a hot coiling box, finish rolling, laminar cooling and coiling. The yield strength is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 600 MPa, the percentage elongation after fracture is larger than or equal to 26%, and the maximum force percentage elongation is larger than or equal to 14%. The hot rolled steel is subjected to the machining procedures of heating of a high-frequency electric heating device, three-roller spinning equal-diameter rolling, online heat treatment, saw cutting and slow cooling of a cooling bed, and a hollow anchor rod body is obtained; the yield force is larger than or equal to 150 kN, the tensile resistance is larger than or equal to 200 kN, and the maximum force elongation is larger than or equal to 6%. The method can effectively solve the problem that the ductility of the hollow anchor rod body prepared after heat treatment is poor due to the fact that existing anchor rod steel cannot have strength and ductility at the same time.

The invention discloses hot-rolled air-cooled bainite steel as well as a preparation method and application thereof. The hot-rolled air-cooled bainite steel comprises the following chemical components in percentage by mass: 0.18%-0.28% of C, 1.6%-2.4% of Mn, 0.8%-1.5% of Si, 0.2%-0.6% of Cr, 0.1%-0.2% of Mo, 0.02%-0.08% of V, 0-0.015% of Ti, 0.01%-0.02% of Al (t) and the balance of Fe and residual trace impurities. The preparation process of the hot-rolled air-cooled bainite steel is simple, carbide-free bainite, retained austenite and martensite are formed through natural air cooling and low-temperature tempering of the hot-rolled round steel, the processes of quenching, quenching, medium-high temperature tempering, salt bath treatment and the like are avoided, the heat treatment cost can be saved, and emission of harmful gas is reduced. In addition, the hot-rolled air-cooled bainite steel is excellent in mechanical property and can be used for manufacturing large-size bolts.

The low-alloy high-hardenability ultrahigh-strength steel comprises the following chemical components in percentage by mass: 0.29 to 0.33 percent of C, 1.30 to 1.60 percent of Mn, 1.30 to 1.60 percent of Si, 1.10 to 1.40 percent of Cr, 0.40 to 0.50 percent of Ni, 0.30 to 0.50 percent of Mo, 0.08 to 0.15 percent of V, less than or equal to 0.20 percent of Cu, 0.02 to 0.06 percent of Ti, 0.001 to 0.005 percent of B, 0.01 to 0.06 percent of Al, less than or equal to 0.0060 percent of S, less than or equal to 0.013 percent of P and the balance of Fe. On the basis of 30CrMnSiA, a trace amount of alloy elements Ni, Mo, V, Ti, B and Al are added, and the high-strength steel with the strength of 1600 MPa is obtained in cooperation with a production process; and meanwhile, excellent hardenability is obtained, and the steel can be used as a civil structural material and also can be suitable for the military industry.

The invention belongs to the technical field of ultrahigh strength maritime work steel plate production, and particularly relates to an extra-thick specification 460 MPa grade steel plate for ocean engineering and a preparation method thereof.The steel plate comprises, by mass, 0.08%-0.10% of C, 0.20%-0.40% of Si, 1.50%-1.65% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, 0.030%-0.040% of Nb, 0.010%-0.020% of Ti, 0.26%-0.35% of Cr, 0.35%-0.45% of Ni, 0.15%-0.25% of Cu and 0.020%-0.050% of Al, Pcm is controlled to be smaller than or equal to 0.22%, and Ceq is controlled to be smaller than or equal to 0.46%. According to the 460MPa-grade ultrahigh-toughness maritime work steel plate, the upper yield strength ReH is larger than or equal to 460MPa, the tensile strength Rm ranges from 540 MPa to 720MPa, the percentage elongation after fracture A is larger than or equal to 17%, the core transverse KV2 at the temperature of minus 60 DEG C is larger than or equal to 150J, the CTOD characteristic value of base metal at the temperature of minus 40 DEG C is larger than or equal to 0.25 mm, and the CTOD characteristic value of a welding heat affected zone at the temperature of minus 20 DEG C is larger than or equal to 0.45 mm after 50kJ / cm heat input submerged-arc welding.

The invention belongs to the technical field of high-pressure hydrogen storage containers in the hydrogen energy storage and transportation equipment industry, and particularly relates to a self-reinforced high-pressure hydrogen storage container with an inner steel cylinder and an outer winding steel wire and a manufacturing method thereof. A self-enhancement high-pressure hydrogen storage container with an inner steel cylinder and an outer winding steel wire comprises a lining steel cylinder, a gas inlet and a gas outlet are formed in the two ends of the lining steel cylinder respectively, an enhancement layer is arranged on the outer side of a cylindrical cylinder in the middle of the lining steel cylinder, and annular anti-skid tables are arranged at the junctions of the arc tops of end openings of the outer walls of the lining steel cylinder at the two ends of the enhancement layer and the cylindrical cylinder respectively. And the reinforcing layer is formed by annularly winding a high-strength steel wire prepreg tape and curing the high-strength steel wire prepreg tape through epoxy resin. By means of the structure of the lining seamless steel cylinder and the winding steel wire reinforcing layer, the pressure bearing capacity of the container is effectively improved, the water volume of the hydrogen storage container of 103 MPa or above for the 70 MPa hydrogen refueling station is further increased, meanwhile, due to the fact that the price of high-strength steel wires is far lower than that of carbon fibers, the product manufacturing cost is reduced, and meanwhile the problem that non-metal wire winding materials are prone to aging is solved.

The invention relates to a heat treatment process for a low-temperature application precipitation hardening martensitic stainless steel forge piece. The heat treatment process comprises the following steps: S1, blanking; s2, upsetting and punching are carried out; s3, ring rolling is conducted, specifically, the blank is heated to 1100-1150 DEG C before rolling, heat preservation is conducted, and a forge piece is cooled after rolling is completed; s4, solid solution is conducted, specifically, the forge piece is heated to 830-850 DEG C for heat preservation, and then the forge piece is cooled; and S5, aging is conducted, specifically, the forge piece is subjected to first-step aging firstly, the forge piece is heated and heated to 480-700 DEG C for heat preservation and then cooled to the room temperature, and the forge piece is heated and heated to 480-700 DEG C for heat preservation in the second-step aging. The method has the advantages that the content of inverted austenite is increased through first-step aging, precipitation of NiAl and Ni3Ti is enhanced through second-step aging, and the fracture performance of the material is improved.

The invention discloses a method for improving the interlayer performance uniformity of a large-size high-toughness 7xxx aluminum alloy pre-stretched super-thick plate, and relates to the field of improvement of interlayer performance differences of high-strength aluminum alloy pre-stretched super-thick plates. The method aims at solving the problems that in the subsequent part machining and application process of the 7xxx alloy super-thick pre-stretched thick plate, the performance difference of a plate thickness layer is large, the damage resistance of the position where the performance of the plate is weak is reduced, the part loses efficacy, and the model safety is reduced. The method comprises the steps of controlling the uniformity of cross-section structure components of a large-size cast ingot, performing strong rolling deformation of plate interlayer performance uniformity, and performing strong quenching for improving the hardenability of the plate. According to the plate prepared through the method, the bottleneck that the comprehensive performance of the plate is synergistically improved is broken through, the overall performance of the thick plate is improved, the service life of parts is prolonged, the structural safety is enhanced, and the market competitiveness of products is improved. The method disclosed by the invention is used for controlling the interlayer performance uniformity of the 7xxx large-specification, super-thick and ultrahigh-strength aluminum alloy pre-stretched thick plate.

The invention discloses extra-thick rack steel EQ70 for an ocean platform and a production method of the extra-thick rack steel EQ70, the thickness of a steel plate ranges from 210 mm to 254 mm, the steel comprises, by weight, 0.10%-0.12% of C, 0.10%-0.20% of Si, 1.60%-1.70% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.003% of S, 0.030%-0.050% of Als, 2.00%-2.50% of Ni, 0.40%-0.50% of Cr, 0.50%-0.60% of Mo, 0.030%-0.040% of Nb, 0.0015%-0.0020% of B and the balance Fe and inevitable impurities, and the components of the steel meet the conditions that Ceq is smaller than or equal to 0.76%, Pcm A novel alloy component system is combined with clean steel smelting, water-cooling die casting, a heating temperature control process, a high-pressure rolling and after-rolling cooling process, a high-temperature rapid quenching process and an after-tempering rapid cooling process, and finally the steel plate performance is obtained, ReH is larger than or equal to 690 MPa, Rm is 810-890 MPa, the minus 40 DEG C longitudinal and transverse Charpy impact energy unit value is larger than or equal to 120 J at the 1 / 4 thickness position and the 1 / 2 thickness position of the steel plate, and flaw detection meets the GB / T 2970 first level. By adopting the scheme, the alloy is low in cost, high in yield and high in production efficiency, and has good market competitiveness.

The invention discloses a Ti-V-Zr-Cr-Al series ultrahigh-strength near-beta titanium alloy and a preparation method, and belongs to the technical field of titanium alloy materials, the ultrahigh-strength near-beta titanium alloy comprises, by mass, 5.0%-5.5% of Al, 11.0%-11.5% of V, 2.5%-3.0% of Cr, 4.5%-5.0% of Zr and the balance Ti and inevitable impurity elements; in the preparation process, firstly, an alloy ingot is subjected to blooming forging and cooled to a phase transformation point for upsetting forging, a certain amount of primary alpha phases are formed in the alloy and evenly distributed in beta crystal grains, and a titanium alloy forging stock is obtained; and then the titanium alloy forging stock is sequentially subjected to solution treatment and aging treatment, and the near-beta ultra-high-strength titanium alloy of the double-state structure is obtained. The tensile strength exceeds 1800 MPa, the yield strength reaches 1780 MPa, the elongation at break is larger than 3.2%, and the uniform elongation is larger than 2.8%. Particularly, the tensile strength reaches 1800 MPa, the requirements of the fields of aerospace, the energy industry and the like can be met, and high use value and popularization value are achieved.

The invention relates to the field of titanium alloy materials, in particular to an inactive eutectoid element regulated alpha + beta type titanium alloy and a preparation method thereof. The titanium alloy comprises the following chemical components in percentage by mass: 5.0 to 7.0 percent of Al element, 2.0 to 4.0 percent of Nb element, 1.0 to 3.0 percent of Mo element, 1.0 to 3.0 percent of V element, 1.0 to 2.0 percent of Zr element, 0.5 to 3.0 percent of Fe element and the balance of Ti. The preparation process of the titanium alloy comprises the steps of electrode pressing, cast ingot preparation, high-temperature homogenization treatment, forging, rolling, solution treatment and aging treatment. The strength and toughness of the titanium alloy are adjusted by regulating and controlling the content of the non-active strong beta stable element Fe, the alpha + beta type high-strength and high-toughness titanium alloy with different strength levels is obtained, and the alpha + beta type high-strength and high-toughness titanium alloy can be widely applied to the important fields of aerospace, ocean engineering, weaponry, petrochemical engineering, automobile industry, biomedical treatment and the like.

The invention belongs to the technical field of steel manufacturing in the metallurgical industry, and particularly relates to wind power fastener steel and a production method thereof. The wind power fastener steel comprises the following components in percentage by weight: 0.38 to 0.45 percent of C, 0.50 to 0.80 percent of Mn, 0.17 to 0.37 percent of Si, 0.15 to 0.25 percent of Mo, 0.90 to 1.20 percent of Cr, 0.30 to 0.50 percent of Ni, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.20 percent of Cu and the balance of Fe. The method comprises the steps of smelting, refining, vacuum degassing, continuous casting, continuous rolling and wind power fastener steel machining. The Ni element is creatively added, technological operation is combined, the impact energy of the wind power fastener steel material is 50 J or above, the highest impact energy reaches 72.7 J and far exceeds the low-temperature impact energy of a conventional material, the remarkable technical effect is achieved, and wide market application prospects are achieved.

The invention provides a preparation method of a low-cost, high-strength and high-toughness ADI casting, and mainly relates to the field of casting materials and heat treatment. The invention discloses a preparation method of a low-cost high-strength high-toughness ADI casting. The preparation method comprises the following steps: smelting; 60% of low-manganese steel scrap with the manganese content smaller than or equal to 0.5% and 40% of scrap iron are taken and added into a smelting furnace to be smelted, low-temperature smelting is conducted at the temperature of 1460-1480 DEG C, and then high-temperature standing is conducted for 5-10 min within the range of 1490-1510 DEG C; spheroidizing and inoculating; the spheroidizing bag containing the molten iron is hoisted to a wire feeding spheroidizing machine to be subjected to spheroidizing treatment; casting is conducted; the molten iron obtained after spheroidizing inoculation is subjected to casting molding in a mold; heat treatment is conducted, specifically, the cooled casting is heated to 840 + / -10 DEG C, and then isothermal quenching is conducted under the temperature condition of 370 + / -10 DEG C; the method has the beneficial effects that cost can be reduced, efficiency can be improved, and casting products with higher quality can be prepared with lower cost.

The invention discloses a preparation method of a 700MPa-grade ultra-fine grain aseismic steel bar with ultra-high strength. The 700 MPa grade ultra-high strength ultra-fine grain aseismic steel bar is prepared from the following chemical components in percentage by weight: 0.27 to 0.29 weight percent of C, 0.70 to 0.80 weight percent of Si, 0.60 to 0.70 weight percent of Mn, 1.05 to 1.15 weight percent of Cr, 0.165 to 0.180 weight percent of V, 0.012 to 0.016 weight percent of Nb, less than or equal to 0.030 weight percent of S, less than or equal to 0.030 weight percent of P, less than or equal to 0.0040 weight percent of O, 0.0300 to 0.0350 weight percent of N and the balance of Fe and inevitable impurities. The yield strength of the steel is 710-745 MPa, the tensile strength of the steel is 895-950 MPa, the maximum force total elongation of the steel is larger than or equal to 10.0, and the ferrite grain size of the steel is 12.5-14.0. According to the process, chemical component design, converter smelting, deoxidation alloying, argon station treatment, LF furnace refining, continuous casting, a steel rolling heating schedule, rolling temperature and a controlled cooling process are integrated and innovated, so that multiple strengthening effects of precipitation strengthening, fine grain strengthening, structure strengthening and the like are fully exerted; the produced reinforcing steel bar has the advantages of excellent and stable high-strength performance, fine and uniform microscopic structure, excellent corrosion resistance, excellent anti-seismic performance and the like, and has remarkable economic and social benefits.

The invention relates to the field of metal materials and petroleum machinery, in particular to VBRE low-carbon low-alloy steel for a pressure-bearing part of an ultra-deep well blowout preventer group and a preparation method of the VBRE low-carbon low-alloy steel. The steel comprises the following chemical components in percentage by weight: 0.05 to 0.15 percent of C, 0.05 to 0.35 percent of Si, 0.40 to 0.80 percent of Mn, 2.0 to 3.0 percent of Cr, 0.80 to 1.20 percent of Mo, 0.05 to 0.25 percent of V, 0.0005 to 0.0030 percent of B, 0.0020 to 0.030 percent of RE and the balance of Fe. A series of key technologies such as purification smelting, high-purity rare earth treatment, argon protection pouring, cast ingot high-temperature demolding, high-temperature diffusion annealing, homogeneous forging forming and thermal refining are adopted, and the defects of internal component segregation, shrinkage cavity and porosity, non-metallic inclusion, uneven tissue, unstable performance and the like of the ultra-deep well blowout preventer set pressure-bearing part are greatly reduced; the VBRE low-carbon low-alloy steel for the pressure-bearing part of the blowout preventer group of the ultra-deep well, which has the characteristics of purity, homogeneity, compactness, refinement and the like and excellent obdurability matching, is obtained, and the service performance requirements of high strength, high toughness, heat resistance, corrosion resistance, fatigue resistance and the like are met.

This invention discloses a 440MPa grade steel plate with ultra-low temperature toughness and its preparation method, belonging to the field of steel materials technology. It solves the contradiction between insufficient strength and toughness grades and excessive nickel content in existing low-temperature steels. The composition of the 440MPa grade steel plate with ultra-low temperature toughness, by mass percentage, includes: C: 0.030%–0.085%, Si: 0.18%–0.38%, Mn: 0.95%–1.35%, P: ≤0.010%, S: ≤0.003%, Cr: 0.01%–0.25%, Mo: 0.01%–0.15%, Ni: 3.20%–4.25%, Cu: 0.12%–0.85%, Nb: 0.008%–0.035%, Al: 0.02%–0.036%, Ti: 0.008%–0.022%, with the balance being Fe and other unavoidable impurities. The steel plate of this invention exhibits excellent strength and low-temperature toughness.

The invention discloses 1000MPa-grade hydroelectric steel with optimized low-temperature toughness and a preparation method of the 1000MPa-grade hydroelectric steel, and belongs to the technical field of steel production. The 1000MPa-grade hydroelectric steel with the optimized low-temperature toughness is prepared from the following chemical components in percentage by weight: 0.03 to 0.09 percent of C, 0.80 to 1.40 percent of Mn, 0.10 to 0.15 percent of Si, 0.05 to 0.14 percent of Cu, less than or equal to 0.003 percent of S, less than or equal to 0.01 percent of P, 0.01 to 0.04 percent of Al, 0.03 to 0.10 percent of V, 0.03 to 0.06 percent of Cr, 0.3 to 0.65 percent of Mo, 0.001 to 0.002 percent of B, 0.01 to 0.018 percent of Ti, 0.015 to 0.025 percent of Nb, 0.18 to 0.60 percent of Ni and the balance of Fe and other inevitable impurities. The preparation method comprises a steel-making process, a heating process, a rough phosphorus removal process, a rolling process and a heat treatment process. By optimizing the chemical components and the preparation process of the 1000MPa-grade hydroelectric steel, the low-temperature toughness of the 1000MPa-grade hydroelectric steel is remarkably improved on the basis that the 1000MPa-grade hydroelectric steel with high strength is obtained, and the 1000MPa-grade hydroelectric steel is suitable for industrial application.

The invention belongs to the technical field of aluminum alloy solid phase welding, and particularly relates to an aluminum alloy thick plate single-shaft-shoulder stirring head and a manufacturing and welding method thereof. Comprising a clamping handle, a stirring needle and a shaft shoulder, and two annular inner grooves are formed in the bottom of the shaft shoulder around the center; the stirring needle is integrally conical, the cross section of the stirring needle is of a hexagonal structure, and the hexagonal structure is formed by alternately arranging planes and cambered surfaces; the side walls of the three cambered surfaces of the stirring needle are provided with conical threads, and the side walls of the three planes are smooth surfaces; an aluminum alloy plate with the thickness of 20 mm is adopted for welding, and the downward rolling speed, the rotating speed and the welding speed of a stirring head are determined; continuous and stable welding of the butt joint of the thick aluminum alloy plate with the thickness being 15 mm or above can be achieved; the problems that holes, flashes and burrs exist in welding seams of aluminum alloy thick plates are solved.

The present application relates to a HRB500E earthquake-resistant steel bar and a preparation method thereof, belonging to the technical field of earthquake-resistant steel bar production. The chemical composition of the steel bar comprises: C: 0.20 wt%-0.25 wt%, Si: 0.50 wt%-0.75 wt%, Mn: 1.20 wt%-1.40 wt%, P: ≤0.030 wt%, S: ≤0.030 wt%, V: 0.05 wt%-0.08 wt%, Fe; the metallographic structure of the steel bar is: ferrite and pearlite. The preparation method of HRB500E earthquake-resistant steel bars provided in the present application eliminates the heating step of the heating furnace, and is optimized from the aspects of composition control, continuous casting billet drawing speed control, direct rolling insulation roller conveying control, start rolling temperature, finishing rolling entrance temperature, wire drawing temperature, air cooling process, roller speed, etc. The produced HRB500E earthquake-resistant steel bars have excellent organizational properties, mechanical properties, and earthquake-resistant properties, with performance parameters Rp0.2≥520Mpa, tensile strength Rm≥700Mpa, elongation≥18%, Agt≥9%, strength-to-yield ratio≥1.25, and yield-to-yield ratio≤1.2.

The utility model discloses a low-temperature-resistant GD hanging point fitting which comprises a hanging plate, a left bolt column and a right bolt column which horizontally extend outwards are formed on the left side face and the right side face of the upper portion of the hanging plate, a left pin hole and a right pin hole are formed in the outer end portion of the left bolt column and the outer end portion of the right bolt column, and a connecting hanging hole is formed in the lower portion of the hanging plate. The left fastening nut and the right fastening nut are arranged on the left bolt column and the right bolt column; the closed pin is inserted into the left pin hole and the right pin hole of the left bolt column and the right bolt column; and the hanging plate is formed by forging and processing alloy structural steel 35CrMo. According to the utility model, the main body part, namely the hanging plate, is formed by forging alloy structural steel 35CrMo, so that the quality failure phenomenon of the product in a low-temperature region is effectively prevented.

The invention discloses a low-temperature high-toughness petroleum drill rod and a preparation method thereof, and belongs to the technical field of metallurgy. The petroleum drill rod comprises the following components in percentage by mass: 0.23%-0.28% of C, 0.17%-0.39% of Si, 0.9%-1.10% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 1.05%-1.15% of Cr, 1.05%-1.15% of Ni, 0.24%-0.32% of Mo, 0.03%-0.06% of Nb, 0.01%-0.03% of Ti, 0.003%-0.009% of Re, 0.009%-0.015% of Al, 0.009%-0.015% of Ca, less than or equal to 0.002% of O, less than or equal to 0.00015% of H, less than or equal to 0.003% of N and the balance of Fe and inevitable impurities. Through reasonable design of the components, the minimum yield strength of the pipe body respectively meets the requirements of 105ksi and 135ksi, that is, the room-temperature yield strength is respectively 724-931 MPa (G105L) and 931-1138 MPa (S135L), the tensile strength is respectively 793-1000 MPa (G105L) and 1000-1207 MPa (S135L), and the ductility is greater than or equal to 20%; the weld bearing capacity is higher than that of the pipe body; and the impact energy of the pipe body and the welding seam at-40 DEG C is greater than or equal to 100J and 60J. And the requirement for safe use of the high-strength drill rod of deep oil and gas development under complex extremely-low-temperature working conditions can be met.

The utility model discloses a bearing roller which comprises a roller body, the roller body comprises two circular end faces and a rolling face used for being in contact with a ferrule roller path, grooves are formed in the two circular end faces, and the ratio of the distance between the bottom faces of the grooves to the width of the rolling face is 0.2-0.3. And the structure is simple, the processing is more convenient, the cost is lower, and the use effect is good.

A pre-hardened steel plate for a mirror-surface mold, comprising elements as follows: C: 0.28 to 0.36%, Si: 0.50 to 0.80%, Mn: 1.20 to 1.50%, P ≤ 0.020%, S ≤ 0.010%, Cr: 1.30 to 1.80%, Mo: 0.30 to 0.50%, Ni: 0.65 to 0.90%, V: 0.15 to 0.30%, H ≤ 1.5 ppm, and the balance is Fe and inevitable impurities. A pre-hardened steel plate with high hardenability for a mirror-surface mold having is obtained by using a manufacturing method comprising subjecting continuous casting billets to processes such as rolling, offline slow cooling, normalizing and tempering heat treatments. The advantages of the manufacturing method lie in that the production efficiency of continuous casting is high, the manufacturing costs are low. When not quenched-and-tempered, the hardness of the steel plate having a thickness of 20-180 mm reaches 38-42 HRC, the hardness fluctuation of the entire thickness ≤ 2 HRC, and the level of flaw detection satisfies the requirement of of level I in GB / T2970.

The invention discloses an acid-corrosion-resistant crushing tool bit for crushing blast furnace titanium slag and a preparation method of the acid-corrosion-resistant crushing tool bit, and belongs to the technical field of tool bit manufacturing, the acid-corrosion-resistant crushing tool bit is composed of, by mass, 12.3% of Cr, 5.2% of V, 9.1% of W, 3.3% of Mo, 1.1% of Co, 4.5% of Mn, 5.2% of Ti, 0.5% of Si, 0.3% of C and the balance Fe, the acid-corrosion-resistant crushing tool bit comprises a tool body, and a plurality of tooth tool edges are integrally formed on the tool body. A preparation method of the crushing tool bit comprises the steps that all the components are put into a crucible to be heated and smelted to form a melt, and then casting, normalizing treatment, machining and heat treatment processes are conducted to obtain the crushing tool bit. And other elements can be tightly combined with iron, so that the crushing tool bit with high corrosion resistance, high hardness, high strength and high wear resistance is formed.

The invention discloses a method for producing a high-chromium grinding ball by using an oil-like quenching liquid, which comprises the following steps: austenitizing a high-chromium grinding ball blank, quenching by using the oil-like quenching liquid, and tempering to obtain the high-chromium grinding ball, wherein the oil-like quenching liquid is prepared from the following raw materials in parts by weight: 13 to 15 parts of polyvinylpyrrolidone, 4 to 6 parts of sodium carboxymethyl cellulose, 1 to 2 parts of phytic acid and 77 to 82 parts of water. According to the invention, nano VC, Mo, Ni and oil-like quenching liquid in proper proportion are selected, and a proper heat treatment process is combined, so that the hardness of the grinding ball can be improved, and good toughness can be maintained.

The utility model discloses an oil quenching device for steel ball processing, which relates to the technical field of steel ball processing and comprises a quenching pool, a cooling pool is arranged on one side of the quenching pool, quenching oil is arranged in the quenching pool and the cooling pool and circulates circularly, and a feeding mechanism is soaked in the quenching pool. According to the oil quenching device for steel ball machining, the cooling pool is arranged, quenching oil in the quenching pool is cooled, the quenching effect of steel balls is better, on the other hand, automatic quenching, automatic feeding and automatic discharging of the steel balls are achieved through the feeding mechanism, and the production efficiency is improved.