The present invention relates to an assembly component of an alloy based on iron, nickel and/or cobalt containing at least 10% (w/w) chromium, the assembly component having an annular shape with an inner surface and an outer surface and a thickness between the inner surface and the outer surface in the range of 0.1 mm to 5 mm, the alloy having a content of nitrogen in solid solution providing a microhardness in the range of 250 HV.sub.0.05 to 370 HV.sub.0.05 at a depth from the surface in the range of 0 m to 100 m. The invention also relates to an assembly with the assembly component.

A non-grain oriented electrical steel sheet according to an exemplary embodiment of the present invention includes Si: 1.0 to 4.0%, Mn: 0.1 to 1.0%, Al: 0.1 to 1.5%, Zn: 0.001 to 0.01% B: 0.0005 to 0.005%, and a balance including Fe and inevitable impurities.

A hot-shapable uncoated steel-plate workpiece is press hardened by first transporting the plate through a heating zone continuously or discontinuously and there heating the plate to an austenitizing temperature while blocking entry of oxygen into the heating zone. Then the heated plate is cooled in a cooling zone to a martensitizing temperature below the austenitizing temperature without contacting the heated plate with oxygen. Finally, immediately and without cooling of the cooled workpiece to a martensite start temperature, the cooled workpiece is deformed at least partially in a finishing press into a desired shape.

An ultra-high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 950 MPa and excellent processing properties, includes the following elements in % by weight: C0.075 to 0.115; Si0.400 to 0.500; Mn1,900 to 2,350; Cr0.200 to 0.500; Al0.005 to 0.060; N0.0020 to 0.0120; S0.0030; Nb0.005 to 0.060; Ti0.005 to 0.060; B0.0005 to 0.0030; Mo0.200 to 0.300; Ca0.0005 to 0.0060; Cu0.050; Ni0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from said steel a sum content of M+Si +Cr in said steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is 2.800 and 3.000%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is 2.850 and 3.100%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is 2.900 and 3.200%.

A method of hardening a surface of a ferro-alloy object, the method comprising at least partially gasifying a carbon-containing polymer to form a hardening material source; and exposing the object to the hardening material source, such that the hardening material source and the surface of the object react, thereby hardening the surface of the object.

A steel product bent by heating to 600 C. or more, specifically a heat treated steel product having high strength and excellent chemical conversion coating ability which has scale with FeO content of 90% or more, having a thickness of 1 m or less on the surface.

A method to produce a component from a workpiece via a press which includes at least one die to form the workpiece. The workpiece comprises at least one of a metal, a metal alloy and a coating and has a form of a hollow part. The method includes internal high-pressure forming and/or hydraulic back-pressure forming the workpiece via a fluid and the at least one die at a temperature below a first hardening temperature of the workpiece, and subsequently partially or completely hardening the workpiece by heating the workpiece above the first hardening temperature and then immediately cooling the workpiece. The heating and the cooling are each essentially conducted without a forming so that a fabricated component results.

Disclosed in the present invention is a nanocrystalline soft magnetic alloy with high magnetic induction and high frequency. The nanocrystalline soft magnetic alloy has a molecular formula of Fe.sub.aSi.sub.bB.sub.cMa.sub.dCu.sub.eP.sub.f, in which M includes one or more of Nb, Mo, V, Mn, and Cr, molar percent contents of elements are as follows: 6?b?15, 5?c?12, 0.5?d?3, 0.5?e?1.5, and 0.5?f?3, and the balance includes Fe and impurities. A difference between an induced anisotropy value and an average magnetocrystalline anisotropy value is 0.1-1 J/m.sup.3. The soft magnetic alloy has high magnetic permeability and low magnetic loss at high frequency. Further disclosed in the present disclosure is a method for preparing the nanocrystalline soft magnetic alloy with high magnetic induction and high frequency. Based on a repeated cycle of a thermal field, a transverse magnetic field, and a cold field, the induced anisotropy value (K.sub.u) is similar to the average magnetocrystalline anisotropy value (<K.sub.1>), so that soft magnetic properties at high frequency are improved.

The disclosure is related to a body component or chassis component for a motor vehicle having at least one surface segment composed of a three-layer sheet-metal composite having a central layer and two outer layers, which bound the central layer on the outside and which are integrally joined to the central layer face to face. The outer layers are composed of a stainless steel alloy having a microstructure selected from the group of ferritic, austenitic, or martensitic microstructure and the central layer is composed of a heat-treatable steel alloy, and the body component or chassis component has a bending angle of greater than 80, determined in the plate bending test according to VDA 238-100, having an Rp0.2 yield strength of greater than 900 MPa.

The present invention relates to a zinc plated steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefore. A zinc plated steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the GDOES profile of oxygen, which is measured in the depth direction from the surface of the base steel sheet, has a form in which a local minimum point and a local maximum point alternately appear in the depth direction from the surface, and the difference (a local maximum value?a local minimum value) between the oxygen concentration (a local minimum value) at the local minimum point and the oxygen concentration (a local maximum value) at the local maximum point can be 0.1 wt % or more.