83 results about "Brinelling" patented technology

The invention belongs to the technical field of aluminum alloy materials and preparation thereof, and relates to a high-strength and high-toughness die-casting aluminum alloy and a preparation technology and application thereof.The aluminum alloy comprises Si, Mg, Cu, Mn, Zn, Fe, Cr, Ti, Zr, Sr, Sb, B, La, Ce, Be, P, smaller than or equal to 0.05% of other single elements, smaller than or equal to 0.15% of other impurity elements in total and the balance Al element, the content of Sr and the content of Sb cannot be larger than or equal to 0.005% at the same time, and the balance Al element. According to a singly-cast sample prepared from the high-toughness die-casting aluminum alloy, the tensile strength at the room temperature is 380-450 MPa, the yield strength is 250-350 MPa, the ductility is 3-8%, the brinell hardness is larger than or equal to 105 HB, the electric conductivity is larger than or equal to 19 MS / m, and the heat conductivity is larger than or equal to 140 W / m.K; and at the temperature of 200 DEG C, the tensile strength ranges from 280 MPa to 350 MPa, the yield strength ranges from 220 MPa to 290 MPa, and the ductility ranges from 5% to 10%.

The invention discloses a tin-copper series high-temperature antioxidant solder with low copper corrosion rate, which comprises the following components in percentage by mass: 1.2-2.5% of Cu, 0.1-1.2% of Bi, 0.03-0.15% of alloy element X and the balance of Sn, X is one or more of Ni, Nd, As, P and Ga, and in the alloy element X, the content of Ni is 0.02-0.1%, the total content of Nd and As is 0.01-0.02%, and the total content of P and Ga is 0.005-0.025%. The solder has low copper corrosion rate, high oxidation resistance and high strength, and the copper corrosion rate at 360 DEG C is reduced by 26.4%-58.7% compared with SnCu 0.7; the liquid surface is kept bright for 40-70 seconds at the temperature of 400 DEG C, and the oxidizing slag rate is only 1%-2.5%; the Brinell hardness is improved by 4.8%-65.3% at the room temperature, the tensile strength is improved by 8.5%-59.4%, and the alloy is particularly suitable for dip soldering and wave soldering scenes with the high welding temperature.

The invention relates to an easy-to-form corrosion-resistant and wear-resistant steel plate for a conveying pipeline and a manufacturing method thereof, and belongs to the field of pipeline steel. The surface Brinell hardness of the wear-resistant steel plate is 370-430 HB, the ductility is larger than or equal to 10%, the Charpy V-shaped impact energy at the temperature of-40 DEG C is larger than or equal to 30 J, d is equal to 4 t, and no crack exists after 180-degree cold bending; the martensite structure is uniform and fine, the grain size is larger than or equal to 7 grades, and the total grade of A, B, C and D fine inclusions in the structure is smaller than or equal to 2.0. And under the working condition that the pH value is 6.0-8.5, the corrosion resistance of the steel can be improved by 40% or above compared with that of Q355 structural steel. A high-cleanliness steelmaking continuous casting process, plate blank hydrogen diffusion, two-stage controlled rolling, high-temperature normalizing pretreatment, off-line quenching and tempering are adopted, control is conducted from the aspects of chemical component design, base metal structure and the like, and the low-temperature toughness, formability, corrosion resistance and weldability of the wear-resistant steel plate for the conveying pipeline are guaranteed; and a solution is provided for the application of the long-service-life wear-resistant pipeline.

The Brinell hardness tester comprises a hardness tester body, a winch, a supporting unit, a pressing unit and a detection pressing head are arranged on one side of the hardness tester body, the winch is rotatably connected with the hardness tester body, the supporting unit is suitable for being supported between the hardness tester body and a to-be-tested pipeline, and the pressing unit is suitable for pressing the detection pressing head on the to-be-tested pipeline; one end of the fixing assembly in the length direction is detachably connected with the durometer main body, the other end of the fixing assembly is wound on the winch, and at least part of the fixing assembly and the detection pressure head are arranged on the same side of the durometer main body; the fixing assembly comprises a bandage and a first fixing piece, the first fixing piece comprises a plurality of fixing plates, the fixing plates are sequentially connected, every two adjacent fixing plates are rotationally connected, and the bandage is sequentially connected with the fixing plates. According to the Brinell hardness tester disclosed by the invention, the space between the fixing assembly and the hardness tester main body is adjusted through rotation of the winch, so that the Brinell hardness tester can adapt to measurement requirements of pipelines of more models.

A tempering-free wear-resistant hot rolled strip, includes components in percentage by weight: 0.08-0.22% of C, 0.1-0.55% of Si, 0.8-1.5% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.01-0.055% of Als, 0.005-0.019% of Ti, and less than or equal to 0.007% of N. A method for producing the same includes: desulfurizing molten iron, smelting desulfurized molten iron, and casting into a blank; heating the casting blank; performing rough rolling; performing finish rolling; performing rapid cooling; performing coiling; and performing conventional temper rolling. According to the present disclosure, on the premise that the tensile strength of a steel plate is greater than or equal to 1100 MPa and the elongation is greater than or equal to 12%, the steel plate has a surface Brinell hardness of 330-390 and a core hardness that is 95% or above of the surface hardness.

Reticle pod inner pods include a cover and a baseplate, with the cover and the baseplate contacting one another at contact surfaces. The contact surfaces of the cover and the baseplate each include different materials. The different materials can each be metals. The different materials can differ in hardness. The difference in hardness can be 50 Brinell hardness or greater. One of the different materials can be a ductile material, having elongation at break of 25% or greater. Methods can include providing the cover and the baseplate each including a first material, and providing a second, different material at the contact surfaces of one of the cover or the baseplate.

The invention relates to a hot-rolled steel flat product with a Brinell hardness in the range of 330 HBW to 485 HBW, preferably in the range of 390 HBW to 485 HBW. It is provided that this steel flat product consists of a steel with the following composition in weight percent: C: 0.05 to 0.35, preferably 0.09 to 0.31, particularly preferably 0.12 to 0.28, Si: 0.20 to 0.60, preferably 0.20 to 0.55, particularly preferably 0.25 to 0.55, Mn: 1.65 to 2.8, preferably 1.80 to 2.6, particularly preferably 2.05 to 2.4, Al: 0.01 to 0.10, and optionally one or more elements from: Mo: up to 0.315, preferably 0.018 to 0.295, particularly preferably 0.040 to 0.265, N: up to 0.018, P: up to 0.020, S: up to 0.010, Cr: up to 1.0, preferably 0.10 to 0.85, particularly preferably 0.15 to 0.75, Cu: up to 1.0, preferably 0.05 to 1.0, Ni: up to 0.30, preferably 0.02 to 0.25, Ti: up to 0.033, preferably 0.01 to 0.031, Note: up to 0.06, preferably 0.005 to 0.06, V: up to 0.10, preferably 0.005 to 0.10, B: up to 0.0004, preferably up to 0.00035, Ca: up to 0.005, preferably 0.0005 to 0.005, W: up to 0.2, Co: up to 0.2, Sn: up to 0.05, Sb: up to 0.05 and Zr: up to 0.010, Residual iron, including usual steel-associated melting impurities, wherein the steel has a microstructure composed of the following proportions: at least 70 volume% martensite, up to 30 volume% bainite, wherein a remaining residue is a proportion of not more than 1.5 volume% and is formed by one or more of the following phases: ferrite, pearlite and retained austenite. The invention further relates to a use of such a steel flat product and a method for producing such a steel flat product.

A high-alloy steel electroslag ingot and its homogenization method are provided, comprising the following steps: S1, electroslag ingot pretreatment: removing surface oxide scale and crack defects, and grinding to a surface roughness Ra≤6.3μm; S2, staged heating: heating to 800-900℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1000-1100℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1200-1300℃ at a rate ≤150℃ / h and holding for 10h. -20h; S3, Stepped cooling: Turn off the heating device and cool with the furnace to 800-1000℃, hold for 2-6h; cool to 500-650℃ at a rate of ≤50℃ / h, hold for 2-6h; open the furnace door and introduce cooling air at a speed of 0.5-3m / s to cool to room temperature, obtaining homogenized high-alloy steel electroslag ingots; S4, Post-homogenization testing: the relative standard deviation of each alloying element is ≤5%; the average grain size is ≤10μm; the Brinell hardness fluctuation range is ≤15HBW. This invention eliminates component segregation, refines grain structure, optimizes process parameters, is highly efficient and energy-saving, easy to promote, and has strong practicality.

The application discloses a kind of gear steel 20CrMnTiH round steel heat treatment process, belong to metal material heat treatment technical field.The process is aimed at gear steel 20CrMnTiH round steel, through the multi-dimensional combination optimization of heating holding parameter, cooling mode and tempering process, realize the hardness and organization uniformity precision control of round steel heart, 1 / 2R place and edge, solve the technical problems that the hardness distribution of the specification round steel is uneven under traditional heat treatment process, organization defect is easy to produce, process adaptability is poor.The application process operation controllability is strong, parameter range adaptability is wide, the Brinell hardness difference of each part of 20CrMnTiH round steel after processing is small, metallographic structure is uniform and dense, without wassermann structure and other defects, comprehensive mechanical properties are excellent, suitable for large-scale industrial production, with higher practical value and popularization prospect.

The invention discloses a production method of a low-alloy normalizing container plate. After normalizing, a steel plate with the thickness of mm is subjected to accelerated cooling through a quenching machine, wherein the density I of gaps 1 and 2 is 8-25, the water ratio is 1.55, 1.55, 1.7 and 1.8, the water feeding amount m < 3 > / h is 200, 200, 140 and 140, and the roll gap is the thickness of the plate; 26-36 high densities I and II are used, the low pressure is 1, the water ratio is 1.7, 1.8 and 2.0, the water feeding amount is 140, and the roll gap is the plate thickness; when the plate thickness is 37-48, the low pressure is 2-9, the water ratio is 2.15, the water feeding amount is 140, and the roll gap is equal to the sum of the plate thickness and the plate thickness; when the plate thickness is 49-64, the low pressure is 2-9, the water ratio is 2.0, the water feeding amount is 135, and the roll gap is the sum of the plate thickness and the plate thickness; 65-89, the low pressure is 1-9, the water ratio is 2.0, the water feeding amount is 120, and the roll gap is the thickness of the plate plus 5. Reasonable matching of the surface Brinell hardness in the delivery state and the pulling force at the 1 / 2 position in the die welding state is achieved, and the flatness of the plate shape is guaranteed.

The invention relates to the field of mechanical fixation, in particular to a hammering type brinell hardness tester fixing system which comprises a mounting mechanism, a connecting mechanism and a positioning mechanism, a first mounting groove, at least three groups of mounting ports with pressing assemblies and anti-inversion assemblies are arranged on the outer edge of a supporting circular ring of the mounting mechanism; the connecting mechanism comprises a connecting block, a magnetic attraction assembly, a connecting ring, a connecting protrusion, a second mounting groove and the like which are slidably connected into the first mounting groove. The positioning mechanism comprises a positioning pipe, a sucker assembly and the like. Various functions are achieved through mutual cooperation of all the mechanisms and arrangement of internal parts. The device achieves the technical effects that the hammering type Brinell hardness tester is more stable in fixation, more accurate in positioning and convenient to use and operate, inversion is effectively prevented, and the use safety and reliability are improved.

The invention provides high-strength steel with low residual internal stress and a preparation method thereof, and the high-strength steel with low residual internal stress comprises the following chemical components in percentage by mass: 0.10-0.16% of C, 0.09-0.18% of Si, 1.0-1.5% of Mn, 0.4-0.6% of Cr, 0.05-0.08% of Cu, 0.05-0.1% of Ni, 0.03-0.05% of Al, less than or equal to 0.008% of P, less than or equal to 0.008% of S, 0.5-0.7% of Mo and the balance of Fe and inevitable impurities. Wherein the Brinell hardness of the high-strength steel with low residual internal stress is 200-350 HB. The preparation method of the low-residual-internal-stress high-strength steel is simple, convenient to operate, capable of reducing the production cost and energy consumption and suitable for large-scale production.

The invention discloses corrosion-resistant high-strength saw blade steel and a manufacturing method thereof, and belongs to the field of metallurgy and metal materials. The steel for the saw blade comprises the following components in percentage by mass: 0.63 to 0.70 percent of C, 0.46 to 0.62 percent of S i, 0.79 to 0.98 percent of Mn, less than or equal to 0.033 percent of P, less than or equal to 0.014 percent of S, 0.15 to 0.35 percent of Cr, 0.44 to 0.68 percent of Cu, 0.23 to 0.35 percent of N i and the balance of Fe and impurities. The manufacturing method comprises the steps of molten iron pretreatment, converter smelting, LF refining, VD vacuum treatment, continuous casting, casting blank slow cooling, steel billet heating, rolling, heat treatment, straightening, inspection and the like. According to the corrosion-resistant high-strength steel for the saw blade, a uniform pearlite structure is obtained, the Brinell hardness of a product is larger than 340 HBW, the tensile strength is larger than 1180 MPa, and the corrosion resistance is improved by 44% or above compared with that of conventional steel for the saw blade.

The invention relates to a low-cost high-hardness high-toughness wear-resistant steel plate and a production method thereof, and belongs to the field of metallurgy. The steel comprises the following chemical components in percentage by mass: 0.42 to 0.50 percent of C, 1.60 to 1.90 percent of Si, 1.40 to 1.60 percent of Mn, 0.025 to 0.050 percent of Al, 1.00 to 1.20 percent of Cr, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, 0.0008 to 0.0025 percent of Ca, less than or equal to 0.0014 percent of O, less than or equal to 0.0030 percent of N, less than or equal to 0.00010 percent of H and the balance of Fe and inevitable impurity elements. The steel plate structure is a fine bainite structure, and the grain size is larger than or equal to 7.5 level. The surface Brinell hardness is 520-580 HBW, the Charpy V impact Akv is larger than or equal to 40 J at the temperature of-20 DEG C, and the production thickness of the steel plate is smaller than or equal to 40 mm. The production process is shorter, alloy element components are lower, and the production cost of the product is remarkably reduced.

The invention relates to low-alloy high-toughness martensite wear-resistant steel with the Brinell hardness grade of 450 as well as a preparation method and application of the martensite wear-resistant steel. The wear-resistant steel comprises the following chemical components in percentage by mass: 0.18 percent to 0.45 percent of C, 0.10 percent to 0.50 percent of Si, 1.0 percent to 1.4 percent of Mn, 0 to 0.03 percent of P, 0 to 0.004 percent of S, 0.05 percent to 0.35 percent of Cr, 0.001 percent to 0.009 percent of La, 0.001 percent to 0.009 percent of Ce and the balance of Fe and inevitable impurities. The wear-resistant steel is low in production cost, good in plasticity, high in hardness, good in wear resistance, good in toughness, particularly excellent in low-temperature toughness and wide in application prospect, and the Brinell hardness can reach 450 hardness level.

The application relates to a high-strength high-thermal-conductivity aluminum alloy and a preparation method thereof. The high-strength high-thermal-conductivity aluminum alloy comprises the following components: Si 9.0-11.0 wt%, Fe 0.5 wt%, Mg 0.5 wt%, Sc 0.4 wt%, Zn 0.005-0.01 wt%, Mn 0.01 wt%, B 0.02-0.04 wt%, Cu 0.02-0.05 wt%, inevitable impurities and the balance of aluminum. The high-strength high-thermal-conductivity aluminum alloy has the properties of high thermal conductivity and high strength, the tensile strength is greater than or equal to 270 MPa, the yield strength is greater than or equal to 173 MPa, the elongation is greater than or equal to 5.3%, the thermal conductivity is greater than or equal to 183 W / (m*K), the forming flowability is greater than or equal to 1330 mm, and the Brinell hardness is greater than or equal to 119 HB. The high-strength high-thermal-conductivity aluminum alloy can be recycled multiple times, and the high-strength high-thermal-conductivity aluminum alloy can still maintain high thermal conductivity, mechanical properties and flow forming properties after multiple recycling. The aluminum alloy has high-strength high-thermal-conductivity comprehensive performance, and the application of a proper amount of scandium elements is innovative on the basis of traditional high-strength aluminum alloys or high-thermal-conductivity aluminum alloys. The alloy is suitable for 3C electronic products with high requirements for heat dissipation and strength, such as mobile phones and notebooks.

The utility model is applicable to the technical field of durometers, and discloses an auxiliary device for metering of a hammering type Brinell durometer, rotating columns are rotationally mounted in the middles of two ends of the side edge of a handheld plate through bearings, a hollow frame is vertically and fixedly mounted on the side edge of each rotating column, and a driving mechanism is arranged in each hollow frame; a transmission frame is fixedly installed between the tops of the outer sides of the two hollow frames, a transmission mechanism is arranged in the transmission frame and is in transmission connection with the driving mechanism, a fixing plate is slidably installed between the outer sides of the two hollow frames, the transmission mechanism is in transmission connection with the outer side of the fixing plate, and a fixing suction cup is fixedly installed at the bottom of the fixing plate. And the fixed sucking disc is positioned below the outer side of the handheld plate. According to the technical scheme, the surface of a sample can be adsorbed and fixed by the fixed suction cup, so that the fixed suction cup can provide corresponding adsorption force for the whole mechanism, the labor consumption required by an operator for stabilizing the sample is reduced, and the detection treatment on the hardness of the sample is improved.

The present invention relates to an HB450 grade wear-resistant and corrosion-resistant steel plate and a production method thereof. The chemical composition of the steel plate is as follows by weight: C: 0.20% to 0.23%, Si: 0.2% to 0.4%, Mn: 0.2% to 0.4%, Nb: 0.10% to 0.20%, Cr: 3.10% to 3.30%, Al: 0.31% to 0.4%, Ni: 1.0% to 1.5%, 1.4%≤Al+Ni≤1.8%, and the balance is Fe and unavoidable impurities; impurity elements in the steel are controlled as follows: P≤0.012%, S≤0.00 2%, [N]≤0.0040%, [H]≤0.00015%, [O]≤0.0010%, and retained austenite content of 5% to 8%; the present invention utilizes Nb to precipitate high-hardness particles to enhance the wear resistance of the steel plate, and utilizes Cr to increase the natural corrosion potential of the steel plate, thereby inhibiting corrosion by fluids such as seawater; adopts smelting, refining, slab continuous casting, heating and slow cooling, slab heating, controlled rolling, steel plate slow cooling, and tempering heat treatment processes to produce a wear-resistant and corrosion-resistant steel plate with a Brinell hardness of 450HB, which has wear resistance and corrosion resistance that is more than 1.2 times that of ordinary low-alloy wear-resistant steel plates with the same hardness.

The invention relates to a large-thickness high-toughness wear-resistant steel plate and a manufacturing method thereof, and belongs to the technical field of metallurgy. The high-strength steel comprises the following elements in percentage by mass: 0.27%-0.33% of C, 0.20%-0.35% of Si, 0.80%-1.05% of Mn, 0.025%-0.045% of Al, 0.010%-0.022% of Nb, less than or equal to 0.010% of V, 0.010%-0.022% of Ti, 0.40%-0.60% of Ni, 0.70%-0.90% of Cr, 0.40%-0.60% of Mo, 0.0015%-0.0030% of B, 0.0008%-0.0030% of Ca, less than or equal to 0.010% of P, less than or equal to 0.0015% of S, less than or equal to 0.0015% of O, less than or equal to 0.0030% of N, less than or equal to 0.00010% of H and the balance of Fe. The steel plate has a microstructure of tempered troostite; the surface Brinell hardness is 420 to 480 HBW; the core hardness reaches 90% or above of the surface hardness, the percentage elongation after fracture is greater than or equal to 12%, and the Charpy impact energy at-40 DEG C is greater than or equal to 30J. And the production thickness is 120 to 150 mm.

The invention relates to the technical field of aluminum alloy processing and manufacturing, in particular to an aluminum alloy plate strip for an automobile reversing radar and a preparation method of the aluminum alloy plate strip. The content of Fe is less than or equal to 0.50%; the content of Cu is less than or equal to 0.10%; the content of Mn is 0.40 to 1.00 percent; the content of Mg is 0.60 to 1.20 percent; the content of Cr is less than or equal to 0.25%; the content of Zn is less than or equal to 0.20%; the content of Ti is less than or equal to 0.10%; the weight percentage ratio of Si to Mg to Mn is (1.5-2.5): (1.5-2.5): 1. The plate strip is excellent in mechanical property and Brinell hardness, and orange peel lines and annealing oxidation color spots are not generated on the surface of the plate strip.

1. The name of the design product: portable Brinell hardness tester (with load display). 2. The use of the design product: the design product is used for measuring the hardness of metal materials, especially suitable for detecting metal workpieces with low hardness, coarse or uneven organization. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The asymmetrical magnet actuator comprises an asymmetrical shell, a rotatable permanent magnet, a control knob, a gear handle and a detachable sealing cover, the asymmetrical shell is of a hollow structure with an opening part and comprises a bottom plate and a top plate which are oppositely arranged, the bottom plate comprises a cambered surface plate in the middle and surface plates on the two sides, and the top plate is arranged on the cambered surface plate. The thickness of the cambered plate is smaller than that of the plane plate, and the thickness of the top plate is smaller than that of the cambered plate. The rotatable permanent magnet is rotatably contained in the hollow structure, one end of the control knob is connected with the rotatable permanent magnet, the other end of the control knob is connected with the gear handle, the gear handle can swing clockwise or anticlockwise around the axial direction of the rotatable permanent magnet, and the detachable sealing cover is matched with the opening part and detachably installed on the asymmetric shell. According to the scheme, the shell is of an asymmetric structure, magnetic lines converge at the top in a working state, the attraction force of the magnet is multiplied, a steel workpiece is easily lifted away in a non-working state, and the requirement for the Brinell hardness test force can be well met.

The present invention relates to an HB400 grade wear-resistant and corrosion-resistant steel plate and a production method thereof. The chemical composition of the steel plate is as follows by weight: C: 0.16% to 0.19%, Si: 0.9% to 1.10%, Mn: 0.2% to 0.4%, Nb: 0.10% to 0.20%, Cr: 2.80% to 3.00%, Al: 0.2% to 0.3%, 1.1%≤Si+Al≤1.4%, and the balance is Fe and unavoidable impurities; the impurity elements in the steel are controlled as follows: P≤0.012%, S≤0.002 %, [N]≤0.0040%, [H]≤0.00015%, [O]≤0.0010%, and retained austenite content of 5% to 8%; the present invention adopts a new wear-resistant and corrosion-resistant concept, utilizes Nb to precipitate high-hardness particles to enhance the wear resistance of the steel plate, utilizes Cr to increase the natural corrosion potential of the steel plate, and plays a role in inhibiting corrosion by fluids such as seawater; adopts a unique smelting, rolling and heat treatment production process to produce wear-resistant and corrosion-resistant steel plates with a Brinell hardness of 400HB, which have wear resistance and corrosion resistance that is more than 1.3 times that of ordinary low-alloy wear-resistant steel plates with the same hardness.

This invention discloses a method for preparing high-performance rare-earth wear-resistant steel with low rare-earth content, comprising: composition design: the chemical composition of the wear-resistant steel by mass fraction is: C 0.20-0.25%, Mn 1.2-1.5%, Si 0.4-0.6%, Cr 0.8-1.0%, Mo 0.2-0.3%, Ni 0.1-0.2%, rare earth (Ce+La, mass ratio 1:1) 0.03-0.05%, S≤0.005%, P≤0.015%; converter smelting; rare earth microalloying treatment; LF refining; continuous casting; controlled rolling and controlled cooling. This invention achieves a rare earth addition of ≤0.05%, a Brinell hardness ≥500HB, an impact toughness of -20℃ ≥120J / cm², and a wear resistance performance 1.8 times higher than traditional wear-resistant steel, while improving the product qualification rate to ≥98.5%, enabling large-scale stable production.

Reticle pod inner pods include a cover and a baseplate, with the cover and the baseplate contacting one another at contact surfaces. The contact surfaces of the cover and the baseplate each include different materials. The different materials can each be metals. The different materials can differ in hardness. The difference in hardness can be 50 Brinell hardness or greater. One of the different materials can be a ductile material, having elongation at break of 25% or greater. Methods can include providing the cover and the baseplate each including a first material, and providing a second, different material at the contact surfaces of one of the cover or the baseplate.

The application relates to the technical field of hardness detection, and discloses a Brinell hardness detection device and method for fasteners. The Brinell hardness detection device for fasteners comprises a pressure head, an indentation collection device, a middle groove body, a bottom groove body connected to the groove bottom of the middle groove body, an upper groove body connected to the opening, a lifting mechanism with a driving element and a movable supporting arm, the supporting arm being provided with a slot, a pressure sensing device arranged in the slot, a pressure control device arranged on the supporting arm, the pressure control device being electrically connected to the driving element, and the pressure head being detachably inserted into the slot or the indentation collection device being detachably inserted into the slot. The Brinell hardness detection device for fasteners and the Brinell hardness detection method relying on the same can accurately and quickly obtain the hardness value of a small fastener on site, and solve the defect that the accurate hardness value cannot be obtained due to the limitation of the size and shape of the fastener in the Rockwell hardness on-site detection.

The invention relates to the technical field of heat treatment of wear-resistant flat steel, and discloses a heat treatment and hardness regulation and control process for arc flat steel of a wear-resistant plate of a high-wear-resistant excavator bucket, which comprises the following steps: S1, a pretreatment process, S2, a quenching process, S3, a tempering process, S4, a post-treatment process and S5, a hardness and performance detection process. Two quenching intervals of high hardness emphasis (1040-1080 DEG C) and toughness balance emphasis (850-890 DEG C) are set, and corresponding tempering parameters are matched, so that the surface Brinell hardness of 450-490 HBW is precisely regulated and controlled, the hardness difference value of the same workpiece is smaller than or equal to 20 HBW, the hardness requirement of a high-wear-resistance scene can be met, the method can be suitable for an operation environment with the requirement for toughness, and the service life of the workpiece is prolonged. The problem of single hardness regulation and control in the traditional process is solved.

The application discloses a steel plate material resistant to 500 DEG C and hydrogen sulfide environment, which comprises the following components in percentage by weight: C: 0.06%-0.10%, Si: 0.20%-0.50%, Mn: 0.30%-0.60%, Cr: 4.0%-6.0%, Mo: 0.40%-0.80%, V: 0.05%-0.10%, and N: 0.010%-0.030%. The preparation method comprises the following steps: smelting, casting, heating, rolling, and decomposing bainite through tempering after normalizing, and then stabilizing treatment. The steel plate material prepared by the application has the tensile strength of 380-410 MPa at 500 DEG C, the transverse elongation of 34.0-36.5%, the longitudinal elongation of 36.5-38.5%, the Brinell hardness of 160-170, the yield strength ratio of 0.73-0.75, and the SSCC four-point bending test continuous loading of 720h without fracture.

The application discloses a Brinell hardness block marking method and an indentation measuring method, and comprises the following steps: planning and calculating the maximum available points, planning is performed by taking the indentation diameter as d and the Brinell hardness block diameter as D, each indentation occupies an area with a diameter of 3d, n indentation occupied areas are arranged along a preset radial direction, the number of indentation occupied areas arranged in parallel on both sides of the preset radial direction decreases successively, the number of placed columns is (n-1) / 2, and the decreasing number of columns away from the central column compared with the central column is 1; available points are marked in sections, the center of the available area is marked according to the number and position of the maximum available points calculated in step S1. The marking method firstly plans the number of indentation occupied areas in the radial direction passing through the center of the Brinell hardness block, then calculates the number of columns on both sides of the central column based on the number and calculates the number of each column in a decreasing manner, and finally obtains the number and position of the maximum available points on the Brinell hardness block of the specification, so that the calculation and operation are simple and the cost is greatly saved.

The present invention relates to an HB500 grade wear-resistant and corrosion-resistant steel plate and a production method thereof. The chemical composition of the steel plate is as follows by weight: C: 0.26% to 0.29%, Si: 0.2% to 0.4%, Mn: 0.2% to 0.4%, Nb: 0.10% to 0.20%, Cr: 3.40% to 3.60%, Al: 0.45% to 0.55%, Ni: 1.6% to 1.8%, 2.1%≤Al+Ni≤2.2%, and the balance is Fe and unavoidable impurities; impurity elements in the steel are controlled as follows: P≤0.010%, S≤0.002 %, [N]≤0.0030%, [H]≤0.00010%, [O]≤0.0010%, and retained austenite content of 7% to 9%; the present invention utilizes Nb to precipitate high-hardness particles to enhance the wear resistance of the steel plate, utilizes Cr and Ni to increase the natural corrosion potential of the steel plate, and plays a role in inhibiting corrosion by fluids such as seawater; adopts smelting, refining, slab continuous casting, heating and slow cooling, slab heating, controlled rolling, steel plate slow cooling, and tempering heat treatment processes to produce wear-resistant and corrosion-resistant steel plates with a Brinell hardness of 500HB, which have wear resistance and corrosion resistance that is more than 1.2 times that of ordinary low-alloy wear-resistant steel plates with the same hardness.