JPS62227065A - High permeability magnetic alloy excellent in workability - Google Patents

Abstract

PURPOSE:To provide high magnetic properties, excellent hot workability, and blanking characteristic, by incorporating specific amounts of B to a 30-50wt% Ni high permeability magnetic alloy and reducing S, P, and C content. CONSTITUTION:The high permeability magnetic alloy has a composition consisting of, by weight, 30-50% Ni, <0.2% Si, <1% Mn, 0.002-0.15% B, <0.015% C, <0.01% S, <0.015% P, and or further containing with the balance Fe with inevitable impurities <2% Mo.

Description

Detailed Description of the Invention Field of Application This invention relates to the improvement of a 30wt% to 50wt% NL-based permalloy alloy, which has excellent magnetic properties as well as improved hot workability and hammering properties. 50wt%N
This invention relates to an L-based high permeability magnetic alloy.

Background technology 30wt% to 50wt% NL-based high permeability magnetic alloys are used in DC relays, low frequency applications, etc. : Used as the iron core of 5-frequency coils and transformers.In general, with the recent slow development of electronics, various types of FM equipment have become smaller and more sophisticated, and the characteristics and workability of such magnetic alloys have improved. Improvements are desired.

On the other hand, such high permeability magnetic alloys contain P at the grain boundaries.

Due to the segregation of impurities such as S and O and the formation of carbides, sulfides, phosphides, oxides, or low-melting point eutectic compounds, grain boundary cracks occur during hot rolling, resulting in edge cracks in hot rolled sheets. Also, surface cracks, etc. occur, leading to a decrease in product yield due to deterioration of hot workability.

In addition, such magnetic alloys have a high N content, which increases the toughness of the material, which often causes problems such as fraying during punching, which shortens the life of the mold.

In order to improve the hot workability of the magnetic alloy, 30 wt% to 5
A method has been proposed to measure the effect of reducing impurities, especially P and S, or fixing S in a 0wt%Ni-based high permeability magnetic alloy, prevent grain boundary segregation by adding Mo, and improve heat workability. However, since it conversely causes deterioration of magnetic properties, the amount added must be limited, and sufficient effects in improving magnetic properties and hot workability cannot be obtained.

OBJECTS OF THE INVENTION The object of the present invention is to provide a 30wt% to 50wt% NL-based high permeability magnetic alloy which has excellent magnetic properties as well as excellent hot workability and punchability.

Structure and Effects of the Invention The present invention has high magnetic properties, excellent hot workability, and hammerability.
As a result of various studies on the composition of a 30wt% to 50wt% NL-based high permeability magnetic alloy, we found that by containing a specific amount of B and reducing the S, P, and C contents, we found that It was discovered that high magnetic properties and excellent hot workability and punchability can be obtained.

That is, in this invention, N: 30wt% to 50wt%, Si: 0.2wt% or less, tlni,owt% or less,
B 0.0020wt% ~ 0.015wt%, C0,0
15wt% or less, S 0.01wt% or less, P 0.0
Mo2.0w contains 15wt% or less to improve magnetic properties.
It is a high permeability magnetic alloy with excellent punchability and hot workability, and is characterized by containing less than t% of Fe and the remainder consisting of Fe and unavoidable impurities.

By having the above composition, 30wt% to 50wt%N
As an L-based high permeability magnetic alloy, it exhibits excellent magnetic properties, has improved hot workability and punchability, and has the effect of reducing edge cracks and surface cracks during hot rolling.

Reason for limiting the composition In this invention, if NL is less than 30 wt%, the required magnetic properties as a high permeability magnetic alloy cannot be obtained, and if it exceeds 50 wt%, it is disadvantageous in terms of cost. , 30wt% to 50wt%.

If Si exceeds 0.2 wt%, the magnetic permeability decreases, which is undesirable, and the content should be 0.2 wt% or less.

If Mn exceeds 1.0 wt%, the saturation magnetic flux density and magnetic permeability will decrease, so it is set to 1.0 wt% or less.

If Mo exceeds 2.0 wt%, the saturation magnetic flux density and magnetic permeability will deteriorate, so the content should be 2.0 wt% or less.

In this invention, B is added to improve hot workability and punching properties, but if it is less than 0.0020 wt%, it has no such effect, and if it exceeds 0.015 wt%, borides are generated and magnetic Since the characteristics deteriorate and it is not desirable, 0.
0020 wt% to 0.015 wt% addition.

When C exceeds 0.015wt%, hot workability and R1
o, oi5wt% because it deteriorates the air properties and is undesirable.
The content is as follows, preferably 0.01 wt%
It is as follows.

If S exceeds 0.01 wt%, it will segregate at grain boundaries and deteriorate hot workability and W1 properties, which is undesirable.
．． The content is preferably 0.01 wt% or less, and more preferably 0.01 wt% or less.
005wt% or less.

P exceeds 0.015 wt%, which is undesirable because it segregates at grain boundaries and deteriorates hot workability and magnetic properties.
The content should be 0.015 wt% or less, preferably 0.0
The content is 1 wt% or less.

Examples Example 1 3 obtained by vacuum melting the composition shown in Table 1
An 8 mm thick flat ingot was hot rolled into a hot rolled plate with dimensions of 5 mm thick x 100 mm wide, and then roughly cold rolled to form a cold rolled thin plate with a plate thickness of 0.6 mm. Diameter 45mm
A 33 mm JIS ring was punched out and used as a sample.

The above sample was heat-treated at 1100'Cx for 3 hours in a hydrogen atmosphere, cooled in a furnace to 600'C, and then heated at 100'Cx.
Measure the LA transmittance when cooled at °C/Itr,
In addition to the appearance and punching properties of the hot rolled sheet after hot rolling,
Shown in Table 2.

The appearance condition was evaluated by the large serrations of the edges when a 38 mm thick flat ingot was made into a 5 mm thick hot rolled plate. Measure the depth of the ear crack and determine the board width of the top, middle and bottom parts by 10mm.
It is shown as the average value of the ear crack depth with respect to 0 mm.

In addition, the punching property was determined by trial iEI (2
) using a punching die (1) that can hold a punch (3
), and the punch (3) stroke group at that time was measured and evaluated using the punch stroke index. That is, the punch stroke length is expressed as an index, and a high index indicates poor punching performance, while a low index indicates good punching performance.

Margin below Table 2 Margin below

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cutting die used for the punching property test in Examples. 1... Punching die, 2... Sample, 3... Punch.

Claims (1)

[Claims] 1 Ni 30wt% to 50wt%, Si 0.2wt% or less, Mn 1.0wt% or less, B0.
0020wt%~0.015wt%, C0.015wt
% or less, S 0.01 wt % or less, P 0.015 wt % or less, and the remainder consists of Fe and unavoidable impurities. 2 Ni 30wt% to 50wt%, Si 0.2wt% or less, Mn 1.0wt% or less, Mo2
．． 0wt% or less, B0.0020wt% to 0.015wt%, C0.01
5wt% or less, S0.01wt% or less, P0.015w
A high permeability magnetic alloy with excellent punchability and hot workability, characterized in that it contains t% or less, and the remainder consists of Fe and unavoidable impurities.