36results about How to "Fully hardened" patented technology

The invention discloses a tool joint for petroleum drill pipe against erosion of sulfureted hydrogen and a heat treatment method thereof. The tool joint is made of the steel pipe comprising the following ingredients (wt%): C: 0.3-0.4; Si: 0.1-0.5; Mn: 0.4-1.0, Cr: 0.3-1.2, Mo: 0.4-1.0; V: 0.05-0.15; Nb: 0.04-0.1; Ti: 0.01-0.1; Cu: 0.1-0.4; Ni:0.1-0.4; P<=0.010; S<=0.005, the rests are Fe and unavoidable impurities. The heat treatment method of the tool joint comprises the steps of: heating the whole to 850-1000 DEG C and then cooling in an oil tank, after that, tempering at AC1 temperature which is over 680 DEG C and lower than the material. The invention not only guarantees the sufficient quenching of the tool for drill pipe, but also not produce quenching crack with outstanding performance resisting sulphur.

The invention relates to the technical field of platinum, and in particular relates to a platinum hardening process which comprises steps of baking mixture powder consisting of platinum, sodium chloride, ammonium bifluoride and silicon carbide, and subsequently boiling in water. By adopting the process, the hardness of platinum can be remarkably improved, and the Vickers hardness of platinum is increased to 175 from 54 before process. In the baking process, a container is shaken and oscillated at intervals, so that the surface of platinum comes into full contact with the powder, the surface of platinum can be sufficiently hardened, and the hardening effect is better.

The invention discloses super-high strength cold rolled steel or steel plate, which comprises the following chemical components in percent by weight: 0.08 to 0.18 percent of C, 0.1 to 0.6 percent of Si, 1.4 to 2.4 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.005 percent of S, 0.01 to 0.05 percent of A1, less than or equal to 0.006 percent of N, 0.2 to 0.77 percent of B / N and the balance of Fe and inevitable impurities. A manufacturing method for the super-high strength cold rolled steel comprises the following steps: performing hot rolling, wherein the finishing temperature is between 830 and 930 DEG C and the coiling temperature is between 550 and 650 DEG C; performing cold rolling, wherein the rolling reduction is 40 to 70 percent; performing continuous annealing, namely holding the temperature between 780 and 880 DEG C, cooling the steel to be between 700 and 750 DEG C with air at a rate of between 10 and 30 DEG C / s, cooling the steel to be between 550 and 640 DEG C by air blast at the cooling rate of between 60 and 200 DEG C / s, cooling the steel to be below 100 DEG C at the cooling rate greater than 500 DEG C / s and heating the steel to be between 150 and 250 DEG C to perform tempering for 60 to 300s; washing the steel with weak acid; and levelling the steel by 0 to 0.6 percent. Thus the obtained super-high strength band steel or steel plate with high processability can be applied to structures or enhanced parts for automobile manufacturing.

A high strength oil drilling rod, the constituent is (mass ratio): C 0.20 to 0.30 percent, Si 0.1 to 0.5 percent, Mn 0.7 to 1.5 percent, Cr 0.7 to 1.5 percent, Mo 0.1 to 0.4 percent, and the rest being Fe and inescapable impurity. The method for preparation includes: thickening the end of the related steel pipe to prepare the body-pipe of upset drilling rod; heating the whole steel pipe and cooling, lying on a rotating quenching stand, spraying water by axial-flow inside surface and spraying water by laminar flow outside surface when the steel pipe is rotating; by controlling the various amount of outer water delivered to the thickening end of the steel pipe and the body-pipe, or by decreasing the amount of outer water delivered to the body-pipe, or increasing the amount of outer water delivered to the thickening end of the steel pipe, makes the thickness-different pipe and the thickening end have the same cooling rate and the same quenching structure, and also have the same dynamic behavior after quenching.

The invention provides a mask forming method which can reduce a mask forming cost. When the mask with an uneven pattern formed is formed on an intermediate 10, coating film forming treatment forming a paint film 31 by applying an ultraviolet curable coating liquid (radiation curable coating liquid) on the intermediate 10, ultraviolet-irradiation treatment (radiation-irradiation treatment) irradiating the paint film 31 with ultraviolet rays 52a (radiation), and pattern transfer treatment transferring the uneven pattern of a stamper to the paint film 31 by pushing an uneven pattern forming surface in the stamper to the paint film 31 are carried in turn to form the uneven pattern of the mask.

A method for making a glass lubricating pad for hot extrusion of steel pipes, comprising the following steps: 1) The particle size of glass powder is: 20-40 mesh, 30-50%; 40-60 mesh, 30-50%; 60-80 mesh, 10-30%; 2) Water glass is used as the binder for glass powder molding, and the weight ratio of glass powder to water glass is 100:1-3; 3) The mixture of glass powder and water glass is put into a molding mold for molding , no pressure is used during molding or a molding pressure of no more than 100kPa is used; 4) CO2 is filled into the cavity of the molding mold to infiltrate CO2 into the mixture, and the gas flow rate of the mixture of glass powder and water glass per liter is 0.1~5L / min , The inflation time is 10-100 seconds. The method of the invention can strengthen the glass lubricating pad in the forming mold during the production process to have a certain strength, so that the glass lubricating pad is not easily broken during the moving process, and can also solve the problem that the glass lubricating pad with a partially complex structure is difficult to form.