31results about How to "Guaranteed uniform performance" patented technology

The invention provides a compounding process of a surface strengthening layer of a piston rod, which is characterized by comprising the following steps: whasing oil stains and impurities on the working surface of the piston rod, sending 18-8 type austenitic stainless steel powder gas to the working surface of the piston rod, radiating with laser so as to clad stainless steel powder on the working surface of the piston rod and form a stainless steel cladding bottom layer with the thickness of 1-3mm, further sending 1Cr13 type martensitic stainless steel powder gas onto the bottom layer, and radiating with the laser so as to clad the stainless steel powder on the bottom layer of the working surface of the piston rod and form the stainless steel cladding strengthening layer with the thickness of 1-3mm.The compounding process can realize gradient compound strengthening, lead the piston rod of a hydraulic transmission oil cylinder to have longer service life and more balanced operation performances, and avoid the problems of galling of the working surface of the piston rod,leakage of hydraulic oil and the like during the use,caused by lack of cooling lubricating oil or entrance of foreign matters into the cylinder. The process has strong controllability of parameters and is convenient for processing and operation and convenient for industrial large-batch production.

The invention discloses a two-step push type external expander of a large-caliber seamless steel pipe. The two-step push type external expander comprises a base and a drawbar, wherein a to-be-pushed steel tube sleeves outside one end of the drawbar; the other end of the drawbar is equipped with a pushing core rod; a feeding roller path for conveying the steel tube is arranged on the base; a hydraulic lifting gate plate capable of vertically lifting is arranged on the feeding roller path; and the hydraulic lifting gate plate can descend, jack and push the steel tube to horizontally convey to a medium-frequency induction heating coil. According to the two-step push type external expander disclosed by the invention, length of a hydraulic cylinder can be reduced nearly a half through two-step push, so that equipment manufacturing cost is reduced, length limitation of oil cylinder processing is solved from the process, raw materials are be quickly and uniformly heated in a controllable mode by the medium-frequency heating equipment, the raw materials can be pushed and deformed at constant speed, and performance uniformity of the tube body can be guaranteed. According to the thermal expander and the process thereof, the investment is less, the equipment is simple, the construction period is short, the product quality is good, the geometric accuracy is high, the yield is high, the energy consumption is low, and pollution is avoided.

The invention relates to the technical field of high-strength wear-resistant steel plate preparation, in particular to an on-line quenched HB400-grade wear-resistant steel plate and a preparation method thereof. The steel plate comprises the following components of, in percentage by weight, 0.15%-0.18% of C, 0.30%-0.60% of Si, 0.22%-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.025%-0.050% of Alt, 0.10%-0.25% of Ni, 0.80%-1.00% of Cr, 0.15%-0.30% of Mo, 0.010%-0.030% of Ti, less than or equal to 0.0050% of N, less than or equal to 0.00015% of H, the balance Fe and trace impurities. The thickness of the steel plate is 8-20 mm. According to the preparation method, the manufactured wear-resistant steel plate is characterized in that the hardness value ofthe wear-resistant steel plate is 370 HBW-430 HBW, the tensile strength is 1250-1430 MPa, the elongation percentage (A50) ranges from 15% to 18%, the impact toughness value at 20 below zero is greater than or equal to 50J, excellent wear resistance is provided, meanwhile, excellent low-temperature impact toughness is provided, and wear-resistant steel plate is suitable for being used under severeworking conditions such as mining machinery and the like. In addition, different from the conventional off-line conditioning process, the wear-resistant steel plate manufactured by the method is produced by adopting an online quenching and off-line tempering process, the remarkable advantages of short production process and low manufacturing cost is realized.

The invention provides a super-thick high-hardenability HB500-grade wear-resistant steel plate and a manufacturing method thereof. The thickness of the steel plate ranges from 60 mm to 100 mm, and thecomponents comprise the following components of C, Si, Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, Alt, Ni, Cr, Mo, Ti, less than or equal to 0.0050% of N, less than orequal to 0.00015% of H and the balance Fe and inevitable impurities. The manufacturing method of the wear-resistant steel plate comprises the steps of smelting, continuous casting blank slow cooling,forming rolling, quenching and tempering heat treatment. The manufacturing method of the wear-resistant steel plate has the advantages of being reasonable in design and easy to operate; and the steelplate obtained by using the preparation method has the advantages of being high in mechanical property uniformity and good in wear resistance.

The invention discloses alloy constructional steel 27SiMn with 180-200mm thickness and a manufacturing technology thereof. The alloy constructional steel 27SiMn is prepared from the chemical raw materials in percentage by mass: 0.27-0.30% of C, 1.2-1.4% of Si, 1.2-1.3% of Mn, no more than 0.030% of P, no more than 0.030% of S, 0.0008-0.001% of B, 0.020-0.030% of Ti, and the balance of Fe and residual elements. The manufacturing technology comprises the following steps of converter smelting, LF refining, VD vacuum degassing, die casting, heating, rolling, stacking cooling, and heat processing.The components of the alloy constructional steel 27SiMn are rationally designed, the manufacturing technology is improved, and parameters are accurately controlled, so that the alloy constructional steel 27SiMn with 180-200mm thickness and with a good combination property is obtained, and requirements of customers are better met.

The invention provides a compounding process of a surface strengthening layer of a piston rod, which is characterized by comprising the following steps: whasing oil stains and impurities on the working surface of the piston rod, sending 18-8 type austenitic stainless steel powder gas to the working surface of the piston rod, radiating with laser so as to clad stainless steel powder on the workingsurface of the piston rod and form a stainless steel cladding bottom layer with the thickness of 1-3mm, further sending 1Cr13 type martensitic stainless steel powder gas onto the bottom layer, and radiating with the laser so as to clad the stainless steel powder on the bottom layer of the working surface of the piston rod and form the stainless steel cladding strengthening layer with the thickness of 1-3mm.The compounding process can realize gradient compound strengthening, lead the piston rod of a hydraulic transmission oil cylinder to have longer service life and more balanced operation performances, and avoid the problems of galling of the working surface of the piston rod,leakage of hydraulic oil and the like during the use,caused by lack of cooling lubricating oil or entrance of foreign matters into the cylinder. The process has strong controllability of parameters and is convenient for processing and operation and convenient for industrial large-batch production.

The invention discloses a 6mm-thick nuclear power containment steel and a manufacturing method thereof. The steel adopts a low C and Mn component series design, does not add additional alloy components, and takes into account the radiation effect while ensuring the stability of the yield strength. The optimization of the material shape of the billet in the manufacturing method realizes the effective control of the length of the rolled piece during the rolling process, and avoids the large temperature fluctuation caused by the excessive length of the rolled piece. The ultra-high temperature heating system is adopted to ensure that the billet obtains a higher temperature during rolling, and to ensure that the steel plate has a higher final rolling temperature after the rolling is completed. The control of the rolling process reduces the temperature drop during the process and ensures that the fluctuation of the temperature difference between the head and the tail of the rolled piece is small. The length of the rolled piece is optimized and the area with poor plate shape is cut off to ensure the uniformity of the performance of the sampling position. The yield strength of the 6mm nuclear power steel produced by the method is stable, and the obtained performance is excellent in strength and toughness matching, which fully meets the performance requirements. The qualified rate of production performance reaches 94%, which is fully suitable for industrial batch production.

The invention relates to the technical field of high-strength wear-resistant steel plate preparation, in particular to an on-line quenched HB400-grade wear-resistant steel plate and a preparation method thereof. The steel plate comprises the following components of, in percentage by weight, 0.15%-0.18% of C, 0.30%-0.60% of Si, 0.22%-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.025%-0.050% of Alt, 0.10%-0.25% of Ni, 0.80%-1.00% of Cr, 0.15%-0.30% of Mo, 0.010%-0.030% of Ti, less than or equal to 0.0050% of N, less than or equal to 0.00015% of H, the balance Fe and trace impurities. The thickness of the steel plate is 8-20 mm. According to the preparation method, the manufactured wear-resistant steel plate is characterized in that the hardness value ofthe wear-resistant steel plate is 370 HBW-430 HBW, the tensile strength is 1250-1430 MPa, the elongation percentage (A50) ranges from 15% to 18%, the impact toughness value at 20 below zero is greater than or equal to 50J, excellent wear resistance is provided, meanwhile, excellent low-temperature impact toughness is provided, and wear-resistant steel plate is suitable for being used under severeworking conditions such as mining machinery and the like. In addition, different from the conventional off-line conditioning process, the wear-resistant steel plate manufactured by the method is produced by adopting an online quenching and off-line tempering process, the remarkable advantages of short production process and low manufacturing cost is realized.

The invention discloses a control process for performances of a steel plate during hot rolling and flat rolling process of a single-stand steckel mill, which is characterized in that the steel burning temperature at two ends of a heating furnace is 15-40 DEG C higher than that in the middle, the tail temperature of the billet is 10-25 DEG C higher than that at the head; on the procedure without adoption of the steckel mill for scale removal, an air purging system is started and no accumulated water is left on the surface during the rolling process; after a pyrometer detects that the temperature difference of a rolled piece is larger than 50 DEG C, the mill increases the steel throwing speed by an acceleration smaller than 0.02m / s<2>; after a pyrometer detects that the temperature difference of a rolled piece is larger than 30 DEG C, a laminar flow system automatically closes the last one to three groups of cooling water, so as to improve the temperature rise at the tail of the rolled piece and reduce the temperature rise difference of the rolled piece; and for a wide steel plate, a cooling system adopts edge shielding so as to remove temperature difference between the upper edge and the middle along the width direction. By adopting the process in the invention, the performance uniformity of the steel plate flatly rolled by the single-stand steckel mill can be ensured.

The invention provides a bulletproof steel plate for armor and a manufacturing method of the bulletproof steel plate. The bulletproof steel plate for the armor is prepared from, by weight, 0.25-0.38%of C, 0.20-0.40% of Si, 0.22-0.50% of Mn, 0.015% or less of P, 0.005% or less of S, 0.010-0.050% of Alt, 0.10-0.38% of Ni, 0.80-1.50% of Cr, 0.16-0.40% of Mo, 0.010-0.035% of Ti, 0.0050% or less of N,0.00022% or less of H and the balance Fe and inevitable impurities. The manufacturing method of the steel plate comprises a steel making work procedure, a steel rolling work produce and a heat treatment work procedure. The bulletproof steel plate for the armor improves the plastic toughness index while ensuring the strength of the steel plate. The manufacturing method of the bulletproof steel plate for the armor is reasonable in design, the advantages of each control process are fully exerted, the uniformity of the performance of the steel plate is guaranteed, the influence of residual internal stress of the steel plate is effectively eliminated, and the subsequent cutting, welding and other machining properties of the steel plate are improved.

The invention discloses a manufacturing process of a composite cylinder sleeve. In the process, a layer of 18-8 type Austenitic stainless steel is firstly clad on a working surface of a medium carbon quenched and tempered steel or alloy steel cylinder sleeve to be used as a bond coat by a laser cladding technology, and then a layer of 1Cr13 type Martensitic stainless steel is clad to be used as awear-resistant corrosion-resistant surface layer to realize gradient compounding and strengthening, so the cylinder sleeve of a hydraulic transmission oil cylinder has longer service life and more balanced operation performance, and the problems of cylinder sleeve surface galling, hydraulic oil leakage and the like caused by the frequent reciprocating motion of a piston rod when the working surface of the cylinder sleeve lacks cooling lubricating oil or foreign matters enter the cylinder are avoided. The manufacturing process disclosed by the invention has strong technological parameter controllability, is convenient to operate, and brings convenience industrialized mass production.

The invention discloses a tungsten-base electrode material and a preparation method thereof. Tungsten oxide, soluble nickel salt and soluble strontium salt are adopted as raw materials, solid-liquid doping, calcinating, reducing, forming and sintering are carried out in sequence, and the tungsten-base electrode material is prepared. According to 100 parts by weight, the tungsten-base electrode material comprises 88-98.5 parts of tungsten, 0.5-6 parts of nickel and 1-6 parts of strontium. The maximum number of times of discharge of a high-energy ignition gas discharge tube prepared through the electrode material can be 1,980,000. Compared with similar products at abroad, the service life is longer. Great significance in breaking through the limitation of the similar products at abroad on our country and meeting national defense needs is achieved.

The invention belongs to the field of metal materials and machining technologies of the metal materials and discloses a manufacturing method of a Al-Zn-Mg aluminum alloy thin plate. The Al-Zn-Mg aluminum alloy thin plate mainly comprises the following elemental components of 1.0-3.8 of Mg, 5.0-8.0 of Zn, no more than 0.05 of Cu, no more than 0.08 of Fe, no more than 0.05 of Si, no more than 0.05 of Cr, 0.05-0.2 of Ni, 0.1-0.6 of Zr and the balance Al and inevitable elements, wherein each of the inevitable elements is smaller than 0.05, and the total amount of the inevitable elements is 0.15. The manufacturing method mainly adopts hot rolling, cold rolling, pretreatment, stamping and aging treatment; the thickness of the prepared aluminum alloy thin plate is 0.2-5 mm, and the prepared aluminum alloy thin plate has good finished product mechanical performance; and after anodizing, the surface of the plate is consistent, a bank mark and a bright streak are avoided, the color of the plateis uniform and close to the natural color of pure aluminum metal.