58 results about "Hot hardness" patented technology

The present invention employs alkyl polysilicate to form silicone-polyester-polysilicate hybrid compositions with an appropriate proportion to modify silicone-polyester resin, or directly adds the alkyl polysilicate at an appropriate proportion into silicone-polyester resin to produce a hybrid composition. The composition in high baking temperature forms a hybrid structure having good thermal resistance, especially, hot-oil resistance and hot hardness, and good adhesion to metals such as carbon steel, stainless steel and aluminum. The present invention can be used in the field of the protective coating for heat-resistant metal such as frying pans and electric irons to be a kind of novel heat-resistant composition having hybrid structure. The composition in accordance with the present invention comprises (A)silicone-polyester; (B)alkyl polysilicate and the structure thereof comprises (RO)₃—Si—O—(Si(OR)₂—O)_n—R, where n=0˜20 and R represents —CH₃, —C₂H₅, —C₃H₇, or —C₄H₉. The composition mentioned above comprises the compounds of (A) and (B) or the copolymer comprised by (A) and (B).

An iron-based corrosion resistant and wear resistant alloy. The alloy can comprise (in weight percent) 0.005-0.5% boron, 1.2-1.8% carbon, 0.7-1.5% vanadium, 7-11% chromium, 1-3.5% niobium, 6-11% molybdenum, and the balance including iron and incidental impurities. Alternatively, the Nb content can be replaced or combined with Ti, Zr, Hf and/or Ta such that 1%<(Ti+Zr+Nb+Hf+Ta)<=3.5. The alloy has improved hot hardness and high temperature compressive strength and is suitable for use in elevated temperature applications such as in diesel valve seat inserts.

A rock drilling rod is manufactured by placing free ends of first and second hollow rod components in abutment, and establishing relative rotation between the free ends to friction weld those free ends together. The first component comprises a thread and a clearance portion disposed adjacent the thread. The first component has a hot hardness value of at least about 170 HV1 at 600 DEG C. Prior to friction welding the components together, the thread, clearance portion and central passage of the first component are heat treated against corrosion fatigue. Then, the thread is high frequency hardened to a depth at least as great as the heat treated layer. Following the welding, the weld is cooled while keeping a core hardness of the respective portions of the first and second components disposed immediately adjacent the weld no lower than 390 HV1.

The invention relates to ceramic paint having a stereoscopic effect, which is characterized by comprising the following components in parts by weight: 100 parts of silica sol, 50-100 parts of organosilane, 0.3-1 part of catalyst, and 1-20 parts of magnetic powder, wherein the organosilane is methyltrimethoxy silane and/or methyltriethoxy silane; and the catalyst is one or a combination of formic acid, acetic acid, hydrochloric acid, citric acid, methyl formate, ethyl acetoacetate and maleic anhydride. The ceramic paint further comprises 1-5 parts by weight of silicone oil and 5-10 parts by weight of additional organosilane, wherein the additional organosilane is one or a combination of tetramethoxyl silane, tetraethoxy silane, dimethyldimethoxy silane, dimethyldiethoxy silane and phenyltrimethoxy silane. The ceramic paint provided by the invention has favorable cold/hot hardness and wear resistance; and the magnetic powder in the paint can form a coating having multiple stereoscopic patterns, thereby achieving good decorative effect.

The invention relates to a universal cold work tool steel, which belongs to the technical field of material, wherein the components and the percentage by weight are that C 0.90-1.10, Si 0.70-1.30, Mn 0.30-1.00, P<=0.030, S<=0.030, Cr 4.00-5.50, Mo 0.50-1.00, W 1.00-1.90, V 0.75-1.20 and the allowance is Fe. Compared with cold work die steel of chrome 12 system and chrome 8 system which are extensively used, the universal cold work tool steel has better hardness, better abradability and the matching between and toughness and hot hardness and better comprehensive mechanical properties, which can be used to manufacture alloy tool steel, cutting tool and die. The invention provides a high-performance cold work tool steel, which can be selective to use.

The present invention discloses a 3Cr2Mo die steel heat treatment process which is characterized by comprising the following steps, to be more specific, (1) forging; (2) annealing, to be more specific, heating to the temperature of 850 DEG C, performing thermal insulation for 2-4h, at isothermal temperature of 720 DEG C, performing thermal insulation for 4-6h, then cooling in a furnace to 500 DEG C, and taking out of the furnace to cool in the air; (3) quenching and tempering, to be more specific, at the quenching heating temperature of 860-870 DEG C, performing oil quenching, and at 540-580 DEG C performing tempering, wherein the surface hardness is 30-35HRC; and (4) carburizing process, to be more specific, heating at 900 DEG C for (6-8) h, after infiltration, at 850-870 DEG C performing oil quenching, and then performing low temperature tempering at 200-250 DEG C for (2-3) h. The 3Cr2Mo die steel heat treatment process can improve organizational stability of 3Cr2Mo die steel, and has high hot hardness, wear resistance and toughness and other overall performances.

The invention provides a heat treatment process improving the hot hardness and the high temperature abrasion resisting performance of hot mold steel. Charcoal, urea particles, sodium carbonate powderand chromic anhydride are mixed to obtain a carbon-nitrogen strong permeating mixture; a hot mold steel workpiece and the carbon-nitrogen strong permeating mixture are installed in a permeating box atthe same time, and a box cover of the permeating box is sealed; the permeating box is placed into a crucible type electric furnace to be subjected to constant temperature carbon-nitrogen strong permeating at 850-950 DEG C; after quenching treatment, the hot mold steel workpiece is directly immersed into quenching oil to be cooled; and after air cooling, placing into a box type intermediate temperature tempering furnace for tempering twice is performed, and the hot mold steel workpiece high in hot hardness and high in high temperature abrasion resisting performance is obtained. The heat treatment process has the advantages of being easy and convenient to operate, low in cost and obvious in effect, the surface hardness of the obtained hot mold steel can reach 62 HRC or above, the high temperature abrasion resisting performance under the temperature of 600 DEG C exceeds that of a same hot mold steel conventional heat treatment piece twice or above, and the service life of a hot working mold can be effectively prolonged.

The invention discloses a method for electroforming a Co-Ni alloy coating on a copper plate for a continuous casting crystallizer. The method comprises the steps of polishing, oil removing, water scrubbing, back engraving and Co-Ni electroforming. By adopting the method, the electroformed layer is exquisite, the coating is high in hardness and better in hot hardness, and because the coating is high in hardness and good in hot hardness, the abrasion resistance of the copper plate at high temperature is greatly improved, and the steel loading capacity of the copper plate can reach 0.15-0.20 million tons. Besides, the electroforming solution is good in dispersibility, so that the coating is strong in covering capacity and good in leveling performance. Moreover, the copper alloy electrolysis etching solution is an alkalescent solution, and the surface of a chromium-zirconium-copper alloy part can obtain sand-like pearly luster with a uniform color through anode electrolysis etching, so that the bonding force of the coating is improved, the electroformed layer can not generate dross easily, the electroformed layers on high and low areas are relatively uniform, machining wastes of the coating are reduced, and the utilization ratio of raw materials is improved. The method is suitable for electroforming the Co-Ni alloy coating on the copper plate for the continuous casting crystallizer.

The invention relates to a novel steel product for a hot stamping mould. The novel steel product is applicable to the hot stamping mould having requirements on high abrasive resistance and high cold and heat fatigue resistance and belongs to the technical field of hot stamping mould material manufacture processes. The material provided by the invention for the hot stamping mould comprises the following chemical components in percentage by weight: 0.40-0.50% of C, 0.7-0.9% of Si, 0.65-0.85% of Mn, 0.025% of P, 0.005% of S, 2.5-2.7% of Cr, 2.1-2.4% of Mo, 0.8-1.0% of V, and the balance ofl Fe and micro impurities. After being subjected to inductive smelting, electro-slag re-smelting, annealing, homogenizing at high temperature, forging and annealing, the material has a good machining performance. After being subjected to quenching at 1020 degrees centigrade and tempering at 550 degrees centigrade, the material has the advantages of good hot strength, hot hardness, high abrasive resistance and fatigue resistance, good weldability, higher heat conductivity coefficient and lower thermal expansion coefficient. The material is applicable to the hot stamping forming mould.

The invention relates to a laser repairing method for a hot roller with toughness and strength. A transitional alloy layer, an intermediate alloy layer and a surface alloy layer are arranged on the surface of the hot roller layer by layer in a laser cladding manner; alloy powder adopted by the transitional alloy layer is prepared from the following components in percentage by mass: 0.2 to 0.3 percent of C, 3.2 to 3.6 percent of Si, 1.2 to 1.8 percent of B, 2.2 to 2.6 percent of Fe, 7 to 8 percent of Cr and the balance being Ni; alloy powder adopted by the intermediate alloy layer is prepared from the following components in percentage by mass: 0.4 to 0.5 percent of C, 3.8 to 4.3 percent of Si, 11.2 to 11.93 percent of B, 2.5 to 3.2 percent of Fe, 10 to 12 percent of Cr and the balance being Ni; and alloy powder adopted by the surface alloy layer is prepared from the following components in percentage by mass: 0.05 to 0.1 percent of C, 3.0 to 3.16 percent of Si, 2 to 4 percent of Fe, 16 to 19 percent of Cr, 27 to 30 percent of Mo and the balance being Co. The surface of the hot roller repaired by adopting the laser repairing method for the hot roller has good wear resistance, corrosion resistance and hot hardness; and in addition, the inner part of the hot roller has the toughness and the strength, and a good laser cladding effect is realized.

Turbine buckets include a pressure side, a suction side opposite the pressure side, and a bucket squealer tip attached to the pressure side and the suction side. The bucket squealer tip includes a plurality of high hot hardness shroud-cutting deposits deposited on its exterior surface that have a hardness of at least about 1100 kg mm⁻² and a melting temperature of at least about 1500° C.

The invention discloses a heat-resisting steel plate. The heat-resisting steel plate is prepared by sequentially coating a pre-coated steel plate with a base-layer coating and a surface-layer coating and baking, wherein the surface layer of the pre-coated steel plate is coated with the base-layer coating and a base-layer film is formed; and the surface layer of the base-layer film is coated with the surface-layer coating and a surface-layer film is formed. The base-layer coating and the surface-layer coating used in the heat-resisting steel plate are formed by combining organosilicone-modified polyester resin as base materials and other additives; in the heat-resisting steel plate, since the organosilicone-modified polyester resin has the advantages of excellent heat resistance temperature, excellent adhesion and workability to a metal material, excellent solvent resistance and good hot hardness, the organosilicone-modified polyester resin can be sprayed on the surface of the pre-coated metal such as an iron material, an aluminum material or stainless steel and can be widely applied in heat-resistant materials such as baking trays, electric frying pans and barbecue set.

The invention relates to a hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above. A transition alloy layer, a middle alloy layer and a surface alloy layer are cladded with laser layer by layer from the inside on the surface of a hot roller. Alloy powder adopted by the transition alloy layer includes components by mass: 0.12-0.19% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, and 7-8% of Cr, with the balance being Ni. Alloy powder adopted by the middle alloy layer includes components by mass: 0.4-0.5% of C, 3.8-4.3% of Si, 12-13% of B, 2.0-2.45% of Fe, and 10-12% of Cr, with the balance being Ni. Alloy powder adopted by the surface alloy layer includes components by mass: 0.05-0.1% of C, 3.0-3.6% of Si, 2-4% of Fe, 16-19% of Cr and 27-30% of Mo, with the balance being Co. The surface of the hot roller restored by the method has good wear resistance, corrosion resistance and hot hardness, both toughness and strength of the inside of the hot roller are taken into account, and laser cladding effects are good.

The invention discloses carbon-free high-speed steel and a preparation method thereof. According to the carbon-free high-speed steel provided by the invention, iron powder is introduced to replace molybdenum powder and cobalt powder, and a small amount of LaB6 is introduced to improve the tempering resistance and red hardness of the material; and through joint addition of La and B, strengthening is caused, austenite transformation is delayed, structure coarsening and desolvation of alloy elements during tempering are inhibited, so that the red hardness and the hot hardness of the Fe-Co-Mo material are improved. Meanwhile, a preparation process is simple, the cost of the raw materials is reduced, the excellent cutter material performance is shown, and a prepared cutter can keep high hardness and is not sticky under the long-time cutting action, and important application value in the industry is achieved.