Steels for bearings

The present invention provides a method for heat-treating seam-welded constructions of hardenable steel and ferrous alloys with reduced weld-zone hardness and improved weld-zone ductility and toughness This method consists of heating the seam weld rapidly with a secondary heat source to a temperature greater than the martensitic start temperature but not greater than the lower critical temperature, followed by immediately allowing the seam weld to air-cool The rapid tempering of this invention is particularly suited to the production of high strength hardenable alloy seam-welded pipe and tubing and other structures

Method for improving the performance of seam-welded joints using post-weld heat treatment

A press-hardened component and a method for producing press-hardened components, in particular a bodywork component, from a semi-finished product made from unhardened, hot-formable steel sheet. Various process steps are carried out in the process. A component blank is formed from the semi-finished product by a cold-forming process, in particular a drawing process. The component blank is trimmed at the margin side to a margin contour which approximately corresponds to the component to be produced. The trimmed component blank is heated and press-hardened in a hot-forming tool, and then the press-hardened component blank is covered with a corrosion-prevention layer in a coating step.

Press-hardened component and associated production method

A bearing component formed from a bearing steel, wherein the component has an outer surface and comprises through-hardened bainite and/or martensite and has a substantially homogeneous chemical composition, at least a part of the bearing component having a compressive residual stress profile comprising -25 to -1000 MPa at the near surface, wherein the near surface is defined as a region 500 microns or less below the outer surface.

Rolling element or ring formed from a bearing steel

The present invention provides a method for welding and heat-treating seam-welded constructions of hardenable steel and ferrous alloys with reduced weld-zone hardness and improved weld-zone ductility and toughness. This method consists of controlling the cooling rate of the seam weld with a secondary heat source, applied after the weld cools below the materials upper critical temperature (A C3 ), but prior to the weld cooling to ambient temperature. This invention is particularly suited to the production of high strength hardenable alloy seam-welded pipe and tubing.

Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints

A method of complete bainite hardening of steel for use in bearings and other load carrying components, wherein bainite transformation is performed at a temperature just above the martensite formation temperature, transforming 25%-99% of the austenite into bainite at said temperature, and then increasing the temperature to speed up the transformation of the remaining austenite into bainite.

Method of complete bainite hardening

A method for the manufacture of components made of steel
subject to heavy stress, load and/or wear, such as rolling
bearing elements,
 starting from a steel having an austenite carbon content at
hot forming temperature of about 800 - 1100°C of 0.55-0.85 wt%, hot forming of the components above Al of the steel, hardening of the components directly from the hot forming
temperature, in air, possibly forced convection aided by
addition of water, hard machining of the components to their final dimensions, surface finishing of the components.

A method for the manufacture of components made of steel

A method for soft annealing of high carbon steel, characterized by taking objects to be soft annealed directly from a hot forming step and cooling to below Al−20° C.; heating the objects to Al+20° C. or above, and then cooling the objects down to beneath the Al temperature of the steel quickly as in air, which step is performed at least once; heating the objects to Al+20° C. or above, cooling the objects down to about 740° C., and then cooling the objects down to about 690° C. at a cooling rate of 3.5° C./min. or lower; and finally cooling the objects down to ambient temperature.

A method of soft annealing high carbon steel

PROBLEM TO BE SOLVED: To provide a spheroidizing annealing method of a hypo-eutectic low alloy steel resulting to improve the formability and the machinability SOLUTION: In the spheroidizing annealing method of the hypo-eutectic low alloy steel, a typical hot-rolled steel containing a high carbon phase of ferrite and pearite or martensite/bainite microscopic component is (a) heated to the temp between A1 and A3 to develop the austenitic range having higher carbon content ratio than the basic composition, and (b) the temp is lowered to A1 and held so that the austenite can be transformed into the ferrite and carbide, and (c) the temp is held to A1 or lower until the carbide is spheroidized to a prescribed degree

Spheroidizing annealing method of hypo-eutectic low alloy steel

A steel to be air-hardened as part of heat treatments such as hardening-and-tempering, induction hardening, carburizing, carbonitriding or nitriding comprising, in weight %: C 0.10-0.55; Si 0.97-2.03; Mn 1.14-1.83; Cr 0.00-1.65; Mo 0.36-0.58; and the balance Fe + impurities.

Air-hardening, low to medium carbon steel for improved heat treatment

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