JPH0674477B2 - Precipitation-strengthened corrosion resistant Ni-base alloy with high strength and hardness - Google Patents

Description

TECHNICAL FIELD The present invention relates to a precipitation-strengthened Ni-based alloy having particularly high strength and hardness and excellent corrosion resistance.

[Conventional technology]

Generally, chemical plants, electroplating equipment, structural members such as semiconductor equipment, food processing and medical instruments, and various blades and hand tools exposed to seawater, etc. are required to have excellent corrosion resistance. Corrosion resistant Ni-based alloy is used.

[Problems to be solved by the invention]

However, in recent years, even in the industrial field to which the above corrosion resistant Ni-based alloy is applied, there has been a demand for weight reduction and thinning, but the above various corrosion resistant Ni-based alloys have excellent corrosion resistance, However, at present, these requirements cannot be satisfied due to insufficient strength and hardness.

[Means for solving problems]

From the above viewpoints, the present inventors have conducted research to develop an alloy having excellent corrosion resistance and further high strength and high hardness. %), Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, and, if necessary, (a) One or more of W, Cu, and V: 0.1
~ 5%, (b) One or two of B and Ca: 0.001 to 0.01
%, (C) Co: 0.1 to 5%, a Ni-based alloy having a composition containing one or more of (a) to (c) above and the balance Ni and inevitable impurities is excellent. They have found that they have high corrosion resistance and, due to the intermetallic compounds finely precipitated in the matrix, they have high strength and high hardness.

The present invention has been made based on the above findings, and the reason why the component composition is limited as described above will be described below.

(A) Cr The Cr component not only improves the corrosion resistance of the alloy by forming a solid solution in the matrix, but also finely precipitates in the matrix and forms an intermetallic compound composed of the alloy component to improve the strength and strength of the alloy. Although it has an effect of improving hardness, if the content is less than 12%, the desired effect cannot be obtained, while if it exceeds 24%, plastic working of the alloy becomes difficult, Its content was set to 12-24%.

(B) Mo Mo component, like the Cr component, in the coexistence with it,
Has the effect of improving corrosion resistance, strength, and hardness,
If the content is less than 10%, the desired effect cannot be obtained, while if the content exceeds 16%, the plastic working tends to decrease, so that the content is 10 to 16%. I decided.

(C) Fe The Fe component has the effect of improving the hot workability of the alloy, but if its content is less than 0.1%, the desired improvement effect cannot be obtained, while if its content exceeds 15%, Since the corrosion resistance of the alloy will deteriorate, its content should be 0.1-15%.
I decided.

(D) Al The Al component has an action of promoting precipitation of intermetallic compounds and improving strength and hardness of the alloy, but if the content thereof is 0.5% or less, a desired excellent effect on the action is obtained. However, if the content exceeds 5%, the workability and corrosion resistance of the alloy will deteriorate, so the content was defined as over 0.5% to 5%.

(E) W, Cu, and V These components have the effect of further improving the corrosion resistance of the alloy, so they are contained as necessary, especially when further corrosion resistance is required. If 0.1% is less than 0.1%, the desired effect of improving corrosion resistance cannot be obtained. On the other hand, if the content exceeds 5%, plastic working becomes difficult, so the content was set to 0.1-5%.

(F) B and Ca Since these components have the effect of improving hot workability, they are contained as necessary, especially when excellent hot workability is required. If it is less than 0.001%, the desired improvement effect on the above action cannot be obtained, and if the content exceeds 0.01%, on the contrary, the workability tends to deteriorate, so that the content is set to 0.001 to 0.01%. Specified.

(G) Co The Co component has a function of increasing mechanical properties, particularly hardness, and improving wear resistance, so that it is contained as necessary when these properties are required. Content 0.1
If the content is less than 5%, the desired hardness improving effect cannot be obtained, while if the content exceeds 5%, the alloy becomes brittle, so the content was defined as 0.1 to 5%.

(H) Inevitable impurities Since deoxidizers and desulfurizers are used during alloy melting, the inclusion of Mn, Mg, C, and Si as unavoidable impurities is unavoidable, but their contents are Mn: 0.1 % Or less, Mg: 0.05
% Or less, C: 0.015% or less, and Si: 0.05% or less, alloy characteristics are not impaired.

〔Example〕

Next, the Ni-based alloy of the present invention will be specifically described with reference to examples.

Using the usual vacuum melting method, melts with the composition shown in Table 1 were prepared. Diameter: 60 mmφ x length: 20
It is cast into an ingot with a size of 0 mm, and this ingot is hot forged into a thick plate with a width of 80 mm × thickness: 25 mm, which is then scratched and then 1120
Hot rolling at a predetermined hot rolling start temperature in the range of ~ 1250 ° C to form a hot rolled sheet with a thickness of 3 mm, and subsequently, this hot rolled sheet is kept at a temperature of 1200 ° C for 30 minutes. After the solution heat treatment under the conditions of, cold rolling is performed to make a cold rolled sheet with a thickness of 1.2 mm, and finally this cold rolled sheet: a predetermined temperature within the range of 600 to 800 ° C. for 10 hours. By subjecting the present invention to Ni-based alloys 1 to 26, and JIS / NCF plate materials (hereinafter referred to as conventional Ni-based alloy plate materials) 1 to 3 which are conventionally known as corrosion-resistant Ni-based alloys, by performing aging treatment under the conditions of holding Manufactured.

Next, the resulting Ni-based alloy sheet materials 1-26 of the present invention and conventional Ni-based alloy sheet materials 1-3, the tensile strength for the purpose of evaluating the strength, the Vickers hardness for the purpose of evaluating the hardness. For the purpose of measuring
Using a test piece with dimensions of mm × 25 mm × 1.2 mm, temperature: 30
A corrosion test was carried out by dipping in a 10 wt% HCl aqueous solution at ℃ for 24 hours, and the corrosion rate was calculated based on this corrosion result.
The results are shown in Table 1.

〔The invention's effect〕

From the results shown in Table 1, the present invention Ni-based alloy sheet materials 1 to 26
Are clearly superior in corrosion resistance to the conventional Ni-based alloy sheet materials 1 to 3 and have significantly higher strength and hardness. It

As described above, the Ni-based alloy of the present invention has high strength and high hardness together with excellent corrosion resistance, so that when it is used in an industrial field where corrosion resistance is particularly required, weight reduction and thinning can be achieved. It becomes.

Claims (8)

[Claims] 1. A composition containing Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, with the balance being Ni and inevitable impurities (above). %), A precipitation-strengthened corrosion-resistant Ni-based alloy having high strength and high hardness. 2. A Cr content of 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, and further, among W, Cu and V, 1 type or 2 or more types: 0.1-5
%, And a balance of Ni and unavoidable impurities in the balance (above wt%), a precipitation-strengthened corrosion-resistant Ni-based alloy having high strength and hardness. 3. Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, and one of B and Ca, or A precipitation-strengthened corrosion-resistant Ni-base alloy having high strength and high hardness, characterized in that it contains 2 kinds: 0.001 to 0.01%, and the rest has a composition consisting of Ni and inevitable impurities (above weight%). 4. Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, and further, Co: 0.1 to 5%. A precipitation-strengthened corrosion-resistant Ni-based alloy having high strength and high hardness, characterized in that the balance has a composition (above wt%) consisting of Ni and unavoidable impurities. 5. An alloy containing Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, and further containing W, Cu and V. 1 type or 2 or more types: 0.1-5
%, 1 type or 2 types of B and Ca: 0.001 to 0.01%, and the remainder has a composition (above weight%) consisting of Ni and unavoidable impurities. Precipitation strengthening type corrosion resistant Ni-based alloy having. (6) Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, further containing W, Cu, and V 1 type or 2 or more types: 0.1-5
%, Co: 0.1 to 5%, and the balance of Ni and unavoidable impurities in the balance (above wt%), a precipitation-strengthened corrosion-resistant Ni-based alloy having high strength and hardness. 7. Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, and one or more of B and Ca or 2 types: 0.001 to 0.01%, Co: 0.1 to 5%, and the remainder is a composition consisting of Ni and inevitable impurities (above weight%), high strength and high hardness precipitation strengthening type Corrosion resistant Ni-based alloy. (8) Cr: 12 to 24%, Mo: 10 to 16%, Fe: 0.1 to 15%, Al: more than 0.5% to 5%, further containing W, Cu, and V 1 type or 2 or more types: 0.1-5
%, 1 or 2 kinds of B and Ca: 0.001 to 0.01%, Co: 0.1 to 5%, and the balance is composed of Ni and inevitable impurities (above weight%). A precipitation-strengthened corrosion-resistant Ni-based alloy with high strength and hardness.