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7445678 |
Disclosed is a method of producing maraging steel, which includes producing a consumable electrode for vacuum remelting; and subjecting the consumable electrode to the vacuum remelting. The consumable electrode contains not less 5 ppm Mg...
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7438769 |
A method for diffusing titanium and nitride into a base material having a coating thereon using conventional surface treatments or coatings. The method generally includes the steps of providing a base material having a coating thereon; p...
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7238244 |
A new nitriding process by using a salt bath to produce iron and steel parts having excellent abrasion resistance and corrosion resistance includes forming an iron lithium complex oxide layer at the outermost surface of the iron part by ...
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6858099 |
A method for producing a steel material having a high fatigue strength and given a uniform residual stress by a rapid treatment. A marageing steel is subjected to a cold plastic working to have a predetermined dimension, to a solution tr...
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6790294 |
Hard metal particles having hardness which is lower than the hardness of a nitrided outermost layer of a spring and in the range of Hv 500 to 800 and a diameter of 500 to 900 μm are protected against the nitrided surface of the spring a...
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6746546 |
A composition for nitrocarburizing stainless steel parts and a method for producing a nitride or hard case on such parts using the composition, are provided. The composition includes alkali metal cyanate and alkali metal carbonate, where...
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6663724 |
A laminated ring for use as a belt in transmitting power in a continuously variable transmission is produced by welding opposite ends of a sheet of maraging steel to produce a plurality of rings, and rolling said rings to a predetermined...
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6631542 |
A cylindrical drum, which comprises a sheet of maraging steel with welded opposite ends, is severed into a plurality of rings of predetermined width, and the rings are rolled to a predetermined length, after which circumferential lengths...
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6550122 |
A cylindrical drum is prepared by welding opposite ends of a thin sheet of maraging steel. A first solution treatment is effected on the cylindrical drum, and then the cylindrical drum is severed into a plurality of rings each having a p...
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6348110 |
A rotary drill bit is manufactured by a method including the step of forming at least a portion of the bit body from a precipitation hardening alloy, and brazing cutters to the bit body by a heating and cooling cycle during which the bit...
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6179932 |
A motor rotary shaft according to the present invention is constructed only at the surface layer of a journal portion with a hard nitride layer, so that the resultant motor rotary shaft is available at a low cost, not so heavy and excell...
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6093263 |
A gear having high pitching resistance, sufficient surface hardness, sufficient hardened depth, high abrasion resistance, high breakage resistance, high fatigue resistance, and low gear noises. A material equivalent to JIS-SCM420 is soft...
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5948177 |
A method of surface treating a metallic machine tool element includes heating the element prior to insertion of the metal element into a nitrating salt bath for the purpose of both hardening the element and improving the resilience of po...
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5810947 |
The adhesive strength and hardness of chromium nitride(CrN) film deposited on SKD 61 tool steel was significantly enhanced by a nitriding process on the surface the tool steel before coating with a CrN film. These nitriding processes inc...
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5772795 |
A method of producing high strength steel sheet and formed articles fabricated from the sheet and containing about 0.01-0.3 free and uncombined atomic percent Ti, Nb or V as strengthening element, by hot rolling or hot rolling plus cold ...
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5650022 |
A method of nitriding steel which comprises reacting the steel surface with nitrogen so as to form a hard nitrided layer, and, prior to nitriding, holding steel under a gas atmosphere containing fluorine compound gas or fluorine gas and ...
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5240514 |
In subjecting a steel workpiece to nitriding by glow discharge, formation of brittle nitrogen compound is restrained and the surface hardened layer with a nitrogen diffusion layer of high toughness is obtained by making the gas atmospher...
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5176760 |
A hard wear-resistant and corrosion- and oxidation-resistant stainless steel article is made by precision machining a work piece of approximately the size and shape of the desired article, then subjecting the resulting cold worked articl...
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5102476 |
Components made from steel can be nitrocarburized in cyanate- and cyanide-containing salt baths within relatively short times if the process is carried out at 600° to 700° C. in a first stage and at 560° to 590° C. in a second stage....
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4582679 |
To increase the creep strength of a titanium-containing alloy which also contains chromium, the alloy powder is heated in the presence of ammonia at a temperature of the order of 700° C. so as to form a layer of chromium nitride(s) on t...
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4495003 |
A steel tube having a small outside diameter and a large wall thickness, for use, for example, as a high pressure fuel injection pipe for a diesel engine, has a hardened layer on at least its internal surface. The hardened layer is forme...
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4492604 |
Low cyanide nitriding salt baths which are composed of alkali cyanate and alkali carbonate and used for treating components made of steel and iron produce coatings on the surface of the component in some cases and can lead to problems in...
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4332653 |
A method of nitriding by high temperature electrolysis in which the works to be nitrided are dipped into a molten cyanide bath which contains low grade oxides of titanium and/or zirconium in a hot dispersed form as catalyst and maintaine...
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4268323 |
A process for case hardening steel is described. A fused bath of inert salt is maintained which bath is comprised of alkali or alkali earth halides, and alkali, or alkaline earth oxides or carbonates. To this fused bath is added urea, di...
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4204886 |
A method of improving resistance of ferrous parts to wear failure such as galling and seizure, and parts having such increased resistance are disclosed. The invention includes a two step process wherein the part is first nitrided to prov...
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4184899 |
A method of surface hardening stainless steel parts for increasing their wear and fatigue resistance comprises (a) subjecting the surface of the stainless steel part to a salt bath containing, by weight, up to 0.5% sulphur, 4-30% of a cy...
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4019928 |
Iron and steel are nitrided in a salt bath in a process favorable to the environment. The salt bath consists essentially of potassium cyanate, sodium cyanate, potassium carbonate, and sodium carbonate. Preferably, air flows through the b...
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3912547 |
A method of surface-hardening mechanical parts of ferrous metals by introing into the surface layers of the treated parts a plurality of elements chosen from the groups consisting of nitrogen and carbon; nitrogen, carbon and sulphur, nit...
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3753799 |
A method of heat treating a high-chromium alloy steel part comprises maintaining the part in a fused salt mixture of cyanides and cyanates of potassium and sodium and controlling the mixture so as to maintain a desired ratio of sodium an...
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3650853 |
Heat treating apparatus which includes a heat treating furnace, a chute at the back of the furnace, and a quench bath at the bottom of the chute. The chute has at least one opening in it located at a level above the quench bath, through ...
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3507757 |
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3401066 |
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3321338 |
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3317357 |
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3303063 |
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3268372 |
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3208885 |
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3194694 |
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3022204 |
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2395329 |
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2042527 |
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2041769 |
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1975058 |
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1967994 |
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1962091 |
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1961520 |
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1953647 |
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1929392 |
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1747549 |
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1520063 |
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