JPS62161936A - Fe-ni alloy cold-rolled sheet and its production - Google Patents

Abstract

PURPOSE:To improve surface characteristics, electric conductivity, and heat resistance by controlling the composition of nonmetallic impurities formed out of a deoxidizer as an additive to Al2O3-MnO-SiO2 composition having superior hot drawability in refining an Fe-(30-45%)Ni alloy. CONSTITUTION:In refining the Fe-(30-45%)Ni alloy, the amounts of Si, Mn, and Alsol, added as deoxidizer, contained in the alloy are regulated to 0.1-0.3%, 0.3-1%, and 0.0004-0.002%, respectively, and the composition of nonmetal existing in the above alloy is also regulated to Al2O3-MnO-SiO2. Then this casting is soaked to 1,100-1,300 deg.C and hot-rolled. The composition of the nonmetals severally existing in the above alloy is regulated so that it is within the area enclosed with a line connecting the points from 1-5 in the ternary diagram shown in the figure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is directed to the treatment of non-metallic inclusions Al2 in Fe-Ni alloy plates.
Fe-Ni alloy cold-rolled sheet that prevents surface flaws caused by 03 and has excellent cold-rolled surface properties, and its! It's up to you how to decide.

(Prior Art) Conventionally, Fe-Ni alloys have been mainly used as materials for electronic components. For example, l"e-42% Ni alloy is used for IC lead frames because of its excellent electrical conductivity, heat resistance, bending workability, plating adhesion, and solderability. It also has the highest coefficient of thermal expansion. Small Fe-36%
Ni alloys are used in shadow masks for color television receivers and containers for storing cryogenic liquids. These cold-rolled plates for shadow masks and lead frames have a thickness of 0.25 mm.
When processing this cold-rolled sheet into the specified mask shape and frame shape, there are extremely strict requirements for processing accuracy and quality, and there are strict regulations regarding the surface quality of the material. The necessary ingredient regulations have also been established.

As a method for producing a Fe--Ni alloy under the above-mentioned severe conditions, JP-A-59-226117@ discloses controlling A in the alloy component to 0.04% or less.

(Problems to be Solved by the Invention) However, with the above-mentioned A°C composition regulation, all nonmetallic inclusions become 8β203. These Al2zO3 inclusions have no stretchability even when hot rolled, and do not become fine even when cold rolled. Therefore, when the plate is cold-rolled to an ultra-thin thickness of *0.251111, Al2203 inclusions may be exposed on the surface of the cold-rolled plate and cause surface defects.

(Means for Solving the Problems) Therefore, as a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have determined that Si is 0.1 to 0.3% by weight and Mn is 0.
．． Aj2203- of Fig. 1 shows non-metallic inclusions in a Fe-Ni alloy containing 3 to 1.0 wt% of N1, 30 to 451 fi% of N1, and 0.0004 to 0.0020 wt% of AAson, the balance being Fe. Point 1 of the Mn o-si 02 system ternary phase diagram (A, g2034% by weight, MnO58% by weight, 810238% by weight), point 2 (Al22035% by weight, MnO49% by weight, Si 02461ffi%)
, point 3 (Al220323fffit%, MnO2
Triple f1%, 5iOz54w%), point 4 (Af203
27% by weight, MnO31fffffi%, Si0242
wt%) and point 5 (AA20317 wt%, MnO
54% by weight, 5i0229% by weight), a Fe--Ni based alloy cold-rolled sheet with excellent cold-rolled surface properties was developed. This F
AA203-Mn 0-8i 02 in e-Ni alloy
By making the nonmetallic inclusions in the system have a composition within the area within the pentagon connecting points 11, 21, 31, 4, and 5 in FIG. 1, the nonmetallic inclusions can be hot-rolled. Sometimes it becomes easy to stretch.

In addition, the method for manufacturing the Fe-Ni cold-rolled sheet includes soaking in a soaking furnace at a temperature of 1100°C to 1300°C, then hot rolling to elongate the nonmetallic inclusions, and then cold rolling. Fe-
A method for manufacturing Ni-based alloy cold-rolled sheets has been developed.

(Function) 3i 0.1-0.3% by weight, Mn 0.3-1
．． 0% by weight and 30-45% by weight of Ni, the balance F
As a result of experiments, it was found that in the r"e-Ni alloy consisting of e, the composition of nonmetallic inclusions is determined by the Al2soA component. In other words, as shown in Figure 3, the Aβ5oJ2 content is 0.0004% by weight. Below, 50%MnO-50%S
AAsoJ2 content is 0.0 in i○2 type nonmetallic inclusions
030% by weight or more r t, tAβ203 nonmetallic inclusions, and A, gsoJ2 within the range of 0.0004 to 0.0030% by weight, Al2203-Mn 0-8i 02
It was found that the result was non-metallic inclusions. 50% of these
nO-50%Si 02 nonmetallic inclusions, β203 nonmetallic inclusions, and Aj! 203-Mn 0-8i 02
The estimated liquidus temperatures of nonmetallic inclusions are shown in Figure 1 as E, F,
When investigated based on the Aj2203-Mn 0-8i 02 system ternary phase diagram of Osborn et al., 50%Mno-50%S
The estimated liquidus temperature of i02 series nonmetallic inclusions is high at 1300°C or higher, and the estimated liquidus temperature of 100% Al2203 nonmetallic inclusions is 2000°C, both of which are nonmetallic inclusions with low deformability. I understand that. Also, Al203
-Mn 0-8i Even with 02-based nonmetallic inclusions, Al220
AAz 03-Mn 0-
8i Al2203 content in 02-based nonmetallic inclusions is 4
~ 21% by weight, the estimated liquidus temperature within the range surrounded by points 1, 2, 3, 4 and 5 in Figure 1 is 1200°C, which is the lowest, close to spacertite, which increases the deformability. Large non-metallic inclusions can be formed.

Therefore, the present inventors determined that it is necessary to appropriately control the composition of the primary nonmetallic inclusions in order to control the nonmetallic inclusions to a nonmetallic inclusion composition with a low melting point. I ended up getting this.

Based on the above-mentioned knowledge, the present inventors have determined that Ni is 30 to 45% by weight, 3i is 0.1 to 0.3% by weight, and Mn is 0.3 to 1% by weight.
The AJsol content in the molten metal containing 0% and the balance 1"e is as shown in Figure 2, 0.0004 to 0.0020.
By controlling the weight%, Al203 containing 4 to 27% by weight of Al203 with an estimated liquidus temperature of 1200°C and a composition surrounded by points 1°2, 3.4 and 5 in Figure 1, which is close to subesartite. It was confirmed that -Mn 0-8i 02-based nonmetallic inclusions can be formed. At this time, regarding how to adjust the AAsoJ2 content, add 30 to 45% by weight of Ni,
A molten metal containing 0.1 to 0.3% by weight of Si, 0.3 to 1.0% by weight of Mn, and the balance consisting of Fe is placed in a container in a degassing device or a container in a vacuum melting furnace, for example. The charging device connected to A/! Or by adding An alloy, the AJ2soβ content is 0.0004 to 0.0004 using a chemical analyzer.
It was adjusted to 0.0020%.

In addition, 3i, which is a component of the Fe-Ni cold-rolled steel sheet of the present invention,
The reason for limiting the composition ranges of , Mn and Ni will be described. The reason for setting 3i in the range of 0.1 to 0.3% is that Si is an effective element for deoxidizing effect, and if it is less than 0.1%, a sufficient deoxidizing effect cannot be ensured. When the content is 5% or more, selective oxidation of grain boundaries and peeling of the oxide film layer are promoted.

On the other hand, a sufficient deoxidizing effect is observed even when the content is up to 0.3%. (0) It becomes 0.0035% or less, and it is possible to obtain Fe-Ni alloy steel with a sufficiently low amount of inclusions.

Furthermore, in order to obtain an appropriate Alz 03-Mn 0-8i 02-based nonmetallic inclusion composition surrounded by points 1.2, 3.4, and 5 shown in FIG. range. Also, ASTM (American S
ociety for T estina a
ndM material) has a hardness (Hv) of 200
It is specified as ±20 or more, and the above 3ifi0.1 to 0.3
Appropriate strength can be obtained with %.

Mn is an element useful for improving hot workability and reducing welding hot cracking. The t' range which does not affect thermal expansion at low and high temperatures is set in the range of 0.3% to 1.0%.

In addition, MnO is generated simultaneously with the deoxidizing effect of Mn element.
This range is indispensable for controlling the composition to Af1203-Mn 0-8i 02-based non-metal corrosion inclusions having the composition surrounded by points 1, 2, 3.4 and 5 in FIG.

N1 is a 36% Ni steel with a linear expansion coefficient of 1 as shown in Figure 4.
, 15 Xl0-6, the smallest electronic component material with 9X10-6 Pi! Since the expansion coefficient is required, Nim
is in the range of 30 to 45%.

Next, the hot rolling temperature when manufacturing the Fe-Ni cold rolled sheet will be described. The molten steel adjusted as described above is continuously
After forming the ingot by molding or ingot casting, it is soaked in a soaking furnace and then hot rolled.
If the temperature is higher than 1100°C, grain boundary oxidation occurs, and if the temperature is lower than 1100°C, deformation of Al2O3-MnO-SiO2-based nonmetallic inclusions becomes difficult to occur, resulting in surface flaws. Therefore, the temperature of the soaking furnace during hot rolling is set at 1100 to 13
00℃.

(Example) As shown in Table 1, AJ in each melt field component! The son content was varied. At this time, the Aj2soli 1 degree adjustment is as follows:
Components other than /l are adjusted first, and R11 is set to the predetermined Afls.
The Oβ content was adjusted based on the analytical value. Each of the molten metals prepared in this way was continuously cast and cast in a soaking furnace for 1200 min.
After soaking and hot rolling at a temperature of °C, cold rolling was performed at room temperature to obtain a cold rolled sheet.

To investigate the nonmetallic inclusion composition at this time, samples were taken from the slab after blooming, where the nonmetallic inclusions remain undeformed, and from the hot rolled plate, where the nonmetallic inclusions are elongated. X
Quantitative analysis was performed using a line Microlye 1f-.

In addition, to investigate surface flaws, after final finish rolling to a thickness of 0.2 to 0.25 mm+, the coil is passed through an inspection line and the front and back surfaces of the coil are visually inspected. If any were found, it was determined that there were surface flaws. However, rolling defects that occurred during the rolling process were excluded.

Samples 1 and 7 in Table 1 are Fe-36%N1 alloys,
Samples 2, 3.4, 5, 8, 9.10. it is)”e-4
2% Ni alloy, samples 6 and 12 are Fe-45%
It is an N1 alloy. As can be seen from this table, the presence or absence of surface flaws is determined by the content of AJ2soJ2 and Al2 in nonmetallic inclusions.
Since it is controlled by the O3 content, A1. so
The A content is in the range of 0.0004 to 0.0020% by weight, and the β203 content in the nonmetallic inclusions is 4 to 27%.
A cold rolled sheet with no surface flaws and excellent surface properties was obtained by setting the weight to %.

(Effects of the Invention) As explained above, the Fe-Ni cold-rolled sheet of the present invention has excellent surface properties, as well as electrical conductivity, heat resistance, bending workability, plating adhesion, and solderability. It can be applied to shadow masks for color television receivers, IC lead frames, storage containers for liquefied natural gas, etc.

Further, according to the method of the present invention, it is possible to extremely effectively prevent the occurrence of surface flaws, and to produce l''e-Ni cold-rolled steel sheets with excellent surface properties.

[Brief explanation of drawings]

Figure 1 shows the estimated liquidus temperature of nonmetallic inclusions in the ternary phase diagram of Al2O3-Mno-si02-based nonmetallic inclusions. Figure 2 shows how to prevent the occurrence of surface defects in cold-rolled sheets. Figure 3 is a diagram showing the range of formation of AnsoJ2 and O and nonmetallic inclusions, Figure 4 is a diagram showing the range of Al2O3 content in nonmetallic inclusions necessary for FIG. 2 is a diagram showing the Ni content and linear expansion coefficient of a Ni-based alloy. Patent applicant: Kawasaki Steel Corporation Figure 1 Figure 2 CAI cosol (pFHR Figure 3)

Claims (1)

[Claims] 1. Si: 0.1-0.3% by weight, Mn: 0.3-1.0% by weight, Ni: 30-45% by weight, and Al_2sol: 0.0004-0.0020% by weight. %, the balance consists of inevitable impurities and Fe, and trace amounts of nonmetallic inclusions that inevitably remain as part of the inevitable impurities are mainly Al_2O_3− in FIG.
Fe, which has a composition within the region surrounded by the pentagon connecting points 1, 2, 3, 4, and 5 of the MnO-SiO_2 system ternary phase diagram, and has excellent cold-rolled surface properties. -N
I-series alloy cold-rolled sheet. 2. When melting Fe-30 to 45% by weight Ni alloy,
Si and Mn deoxidation and Al deoxidation are sequentially performed to reduce the Si content in the alloy to 0.1 to 0.3% by weight and the Mn content to 0.1% by weight.
3-1.0% by weight and also Alsol content 0.000
By adjusting the composition to 4 to 0.0020% by weight, nonmetallic inclusions in the alloy can be reduced to Al_2O_3-Mn, which has good hot stretchability.
Fe-N characterized in that it is cast with a controlled O-SiO_2 composition, then soaked in a soaking furnace at a temperature in the range of 1100°C to 1300°C, then hot rolled, and then cold rolled.
A method for producing an i-based alloy cold-rolled sheet.