It is an object of the present disclosure to produce a soft magnetic material having high saturation magnetization by heat-treating a Fe-based amorphous alloy, without needing the control of the atmosphere. The present disclosure provides a method for producing a soft magnetic material, including heat treating a Fe-based amorphous alloy in a state in which the alloy is wrapped with a sheet comprising one or more substances having a standard Gibbs energy of formation of an oxide thereof that is larger in a negative direction than Fe, to form a crystal phase.

The invention discloses a centimeter-level high-strength iron-based bulk amorphous alloy and novel copper mold casting method thereof; the molecular formula thereof is Fe.sub.44-xCo.sub.6Cr.sub.15Mo.sub.14C.sub.15B.sub.6Tm.sub.x, wherein x represents the atomic percent of corresponding alloy elements and 0x6; the novel copper mold casting method comprising: directly cooling a copper mold with cooling water under negative pressure through electric arc melting to obtain an amorphous alloy ingot; the alloy has the remarkable characteristics of high amorphous forming ability, high strength and high hardness, by the conventional casting, the maximum critical diameter can be 10 mm, the highest strength can be 4295 Mpa, and the highest Vickers hardness can be 1220 Hv; meanwhile, the alloy has obvious spinning glass behavior at low temperature; the preparation method has low cooling rate, is free from the limitation of mold diameter, and can directly obtain the amorphous alloy ingot, the cost is reduced, and the maximum diameter of the amorphous alloy ingot is 16.52 mm; and by the preparation method, the amorphous forming ability of the bulk amorphous alloy can be determined more accurately.

An amorphous alloy particle is an amorphous alloy particle formed of an iron-based alloy, and the particle contains a grain boundary layer.

The disclosure provides FeCrNiMoPCB metallic glass-forming alloys and metallic glasses that have a high glass forming ability along with a high thermal stability of the supercooled liquid against crystallization.

A soft magnetic powder of the invention has a composition represented by Fe.sub.100-a-b-c-d-e-fCu.sub.aSi.sub.bB.sub.cM.sub.dM.sub.eX.sub.f (at %) [wherein M is Nb, W, Ta, Zr, Hf, Ti, or Mo, M is V, Cr, Mn, Al, a platinum group element, Sc, Y, Au, Zn, Sn, or Re, X is C, P, Ge, Ga, Sb, In, Be, or As, and a, b, c, d, e, and f are numbers that satisfy the following formulae: 0.1a3, 0<b30, 0<c25, 5b+c30, 0.1d30, 0e10, and 0f10], wherein a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less is contained in an amount of 40 vol % or more, and the difference in the coercive force of the powder after classification satisfies predetermined conditions.

There is provided a method for manufacturing an alloy ribbon that suppresses a different magnetic properties at each position of the alloy ribbon obtained by crystallizing an amorphous alloy ribbon. The method for manufacturing an alloy ribbon includes: heating a laminated body in which positions of thick portions of a plurality of amorphous alloy ribbons are shifted to a first temperature range less than a crystallization starting temperature; and heating an end portion in a lamination direction of the laminated body to a second temperature range equal to or more than the crystallization starting temperature after the heating the laminated body. An ambient temperature is held after the heating the laminated body such that the laminated body is maintained within a temperature range in which the laminated body can be crystallized by heating the end portion to the second temperature range. Q1+Q2+Q3Q4 is satisfied.

A method is provided for producing a 0.8-4.5 mm thick steel strip with an amorphous, partially amorphous or fine-crystalline microstructure with grain sizes in the range of 10-10000 nm and also a flat steel product made therefrom. A molten steel is cast into a cast strip in a casting device and cooled down at an accelerated rate. Along with Fe and impurities that are unavoidable for production-related reasons, the molten material contains at least two elements belonging to the group Si, B, C and P. In this case, the following applies for the contents of these elements (in % by weight) Si: 1.2-7.0%, B: 0.4-4.0%, C: 0.5-4.0%, P: 1.5-8.0%. With a corresponding composition and a microstructure with corresponding characteristics, a flat steel product according to the invention has a HV0.5 hardness of 760-900.

After an first heat treatment step, an ambient temperature of a stack is held so that the stack is kept in a temperature range that allows the stack to be crystallized by heating the end of the stack to a second temperature range in the second heat treatment step; and a following expression (1) is satisfied, where Q1 represents an amount of heat required to heat the stack to the first temperature range in the first heat treatment step, Q2 represents an amount of heat that is applied to the stack when heating the end of the stack to the second temperature range in the second heat treatment step, Q3 represents an amount of heat that is released during crystallization of the stack, and Q4 represents an amount of heat required to heat the entire stack to the crystallization start temperature

Q1+Q2+Q3Q4(1).

Disclosed is an iron-based amorphous alloy Fe.sub.aB.sub.bSi.sub.cRE.sub.d, wherein a, b, and c represent, in atomic percentages, the contents of corresponding components, respectively; 83.0a87.0, 11.0<b<15.0, 2.0c4.0, and a+b+c=100; and d is the concentration of RE in the iron-based amorphous alloy, i.e. 10 ppmd30 ppm. The iron-based amorphous alloy has a saturation magnetic induction intensity of no less than 1.63 T, and same can be used to manufacture a magnetic core material for power transformers, motors and inverters.

Examples herein generally relate to sinter blend compositions for use in a sintering process that do not contain coke breeze (0.0% coke breeze), or contain only very small amounts of coke breeze. In particular, these sinter blend compositions are capable of repurposing mixture of iron-making reverts, having high total and metallic iron levels that re-oxidize so as to become a replacement fuel source for the coke breeze typically used in sinter blend compositions for use in a sintering process, while still managing to produce a sinter with sufficient ISO tumble strengths.