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7108756 |
A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reducti...
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6982120 |
The invention relates to components made of steel, more particularly outer joint parts and inner joint parts of constant velocity joints, and to a process of heat treating such components made of steel. The heat treatment operation inclu...
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6946038 |
A weldable structural steel product having fine complex precipitates of TiN and MnS is provided which contains, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.05% Si, 1.0 to 2.5% Mn, 0.05 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 t...
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6884049 |
A screw compressor of which a female rotor is driven by a motor, and of which a male rotor is driven by the female rotor. The male or female rotor is composed of a member which is made of cast iron and is subjected to surface hardening t...
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6579384 |
A ball for use in a constant-velocity joint, which is adapted to be interposed between an inner race and an outer race for transmitting rotational power therebetween, is produced by nitriding a surface of a ball made of bearing steel or ...
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6562151 |
In a rolling shaft relatively rolling with respect to rolling members provided in a radial needle roller bearing, the rolling shaft is composed of a steel containing 0.5 to 1.2 wt % carbon and is provided with a surface layer 3 a conta...
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6451137 |
A method for quenching steel parts having undergone a low-pressure thermal processing, which consists of submitting the parts to a high-pressure air flow.
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6447619 |
High surface pressure resistant steel parts and their producing methods are disclosed. These steel parts are useful as gears, cams, bearings and similar high-strength compact steel articles which are required to have wear resistance and ...
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6406557 |
During the treatment of electrical steel, a careful combination of heat treatment of the slab with a specific primary recrystallization and nitriding treatment allows for control of the distribution, quantity and dimensions of precipitat...
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6328818 |
The present invention features nitriding-treating the ferrous material to form a nitrided layer composed of at least one of iron nitride and iron carbide nitride on the surface thereof, and heating to maintain the ferrous material at a t...
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6325867 |
A rolling bearing contains no more than 0.3 wt % of nitrogen in a grinding allowance portion after carbonitriding and hardening heat treatments, contains from 0.9 wt % (inclusive) up to 1.6 wt % (inclusive) of carbon and from 0.05 wt % (...
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6309475 |
For easily producing a toothed material for high-strength gears etc. with a plastic working technique, deformation resistance occurring in plastic working is reduced and stable high precision plastic working is enabled at lower temperatu...
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6284062 |
A member used in contact with a hot dip galvanizing bath, such as a sinker roll, a support roll or a bearing, is produced by nitriding stainless steel to form a nitride layer and a nitrogen-diffused layer on the surface thereof. The memb...
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6235128 |
The present invention is a unique sequential process for treating carbon and alloy steels to improve resistance to tribological stresses while reducing conventional processing time required to obtain articles having a similar hardness. T...
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6197125 |
A method for improving the corrosion resistance, increasing the hardness, providing superior ductility, and reducing surface-cracking of a diffusion coating by nitriding and heating-treating the diffusion coating is disclosed. The nitrid...
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5669988 |
Object: Prevention of generation of press marks as well as increase of wear resistance at a corrugation tip portion and thereby providing a corrugating roll having a much improved life. Construction: A manufacturing method of a corrugati...
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5667605 |
The invention relates to a method for fabricating a piece of structural steel that includes thermal or thermomechanical treatment steps that could ordinarily lower the fatigue strength and shock and impact resistance of the steel piece. ...
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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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5503687 |
Enrichment of surface and near surface regions of stainless steel components that nearly have their final shape with dissolved nitrogen at temperatures between 1000° and 1200° C. is provided. In this way, ferritic and martensitic struc...
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5298091 |
A method is taught for protecting fuel contacting surfaces of a gas turbine engine from carbon deposition by heating the element in a nitrogen containing atmosphere for sufficient time to cause penetration and absorption of nitrogen into...
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5254181 |
This invention relates to a method for forming a uniform, deep nitride layer on and in steel works at low cost, wherein a steel work is fluorided in heated condition in an atmosphere of a mixed gas composed of fluorine gas and inert gas ...
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5228929 |
Disclosed is a process for manufacturing a corrosion resistant iron-alloy, powered metal or sintered carbide component. In a first step, the component is subjected to an initial thermochemical treatment preferably consisting of nitriding...
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4846899 |
A low carbon steel has a composition which is ferritic, martensitic or ferritic: martensitic at temperatures of the order of 700° C. and substantially fully austenitic at temperatures in excess of 1000° C. and nitriding of a refractory...
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4713122 |
Thin metal articles of pre-determined shape are given a first treatment to provide a hardened surface and a second treatment to correct distortion caused by the hardening treatment. The hardening is provided an epsilon nitride layer and ...
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4366008 |
A method of hardening steel so that it may have a surface layer with sufficient hardness to permit fabrication into machinery parts with a minimum of strain developed therein. The method comprises heating steel at a temperature in a rang...
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4264380 |
A method of nitriding ferrous alloys for improving the quality and integrity of the resultant case or hardened surface portion formed thereby, comprising the application of a specific combination of sequenced temperature and nitrogen con...
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4154629 |
A process for case hardening martensitic stainless steels comprising the steps of forming non-explosive and neutral or weakly reducing atmosphere consisting essentially of 97.5% to 95% by volume of nitrogen gas, 0.5% to 1.5% by volume of...
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3998666 |
Low carbon, low alloy, ferrous metal stock containing from 0.05 to 0.5 wt. percent uncombined group IVB or VB metal, is strengthened by a procedure comprising; gas phase nitrogenation at temperatures below 590° C to form extremely fine ...
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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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3377214 |
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3326675 |
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3216869 |
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3141801 |
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3139359 |
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3012879 |
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2848260 |
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2300274 |
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2298397 |
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2228106 |
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1774999 |
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