JPH079048B2 - Corrosion resistant Ni-base alloy wire rod with high strength and hardness - Google Patents

Description

TECHNICAL FIELD The present invention relates to a Ni-base alloy wire having high strength and high hardness and excellent in corrosion resistance.

[Conventional technology]

For wire ropes used in sour gas field equipment and chemical plants, and for clocks, dot printers, springs and dot pins for precision machines such as analyzers, and drive belts, especially for applications used in corrosive atmospheres. Basically, in% by weight (hereinafter% indicates% by weight), Cr: 15-16%, Mo: 15-16%, and if necessary, W: 3-5%, Fe A corrosion-resistant Ni-base alloy wire rod is used which has a typical composition containing at least one of: 3 to 5%, and the balance being Ni and inevitable impurities.

[Problems to be solved by the invention]

However, in recent years, there has been a demand for weight reduction and diameter reduction even in the above-mentioned industrial fields.The above-mentioned conventional corrosion-resistant Ni-based alloy wire has excellent corrosion resistance, but strength and hardness are not sufficient. At present, it is not possible to satisfy these requirements because they are sufficient.

[Means for solving problems]

Therefore, the present inventors, from the above viewpoint, pay attention to the above-mentioned conventional Ni-based alloy wire rod having excellent corrosion resistance, and impart high strength and high hardness to it without impairing the corrosion resistance of the wire rod. As a result of conducting various studies, it contains Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and if necessary, (a) Fe: 1 to 20%, (b) Co: 0.1 to 5%, (c) one or more of W, Cu, and V:
A Ni-based alloy wire rod containing 0.1 to 5%, one or more of the above (a) to (c), and the balance consisting of Ni and unavoidable impurities has basically excellent corrosion resistance. It has been found that the intermetallic compound that has the above-mentioned properties and is finely precipitated in the matrix provides 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 and Mo Cr and Mo components are solid-solved in the base material to improve the corrosion resistance of the base material and form an intermetallic compound finely dispersed in the base material to improve the strength of the Ni-based alloy wire. Has the effect of improving hardness, but the content of Cr: less than 12% and Mo: 10%
If the content is less than the desired effect is not obtained, on the other hand, if the content exceeds 20%, the plastic workability deteriorates.
%, Mo: 10 to 20%.

(B) Al and Ti These components are precipitated in the matrix as an intermetallic compound,
In the coexistence of Cr and Mo intermetallic compounds, it has the effect of further improving strength and hardness, but if the contents are Al: less than 1% and Ti: less than 0.1%, precipitation formation of intermetallic compounds occurs. No significant improvement in strength and hardness was obtained, while the contents were Al: 3% and Ti: 2, respectively.
%, The plastic workability and corrosion resistance will deteriorate. Therefore, the contents of Al are 1 to 3% and T, respectively.
i: 0.1 to 2%

(C) Fe The Fe component has an economic effect of not impairing the characteristics of the wire even if it is partially contained as a substitute component of Ni, so it is contained as necessary. If it is less than 1%, the economic effect is insufficient, while its content is 20%.
If the content exceeds the range, the corrosion resistance of the Ni-based alloy wire will deteriorate, so the content was defined as 1 to 20%.

The Ni-based alloy wire may contain Fe as an unavoidable impurity in the range of less than 1%. From the above points, however, the characteristics of the wire are not impaired and are allowed. Of course.

(D) Co The Co component has an action of further improving mechanical properties, particularly hardness, and thus is contained as necessary when particularly high hardness is required, but the content thereof is less than 0.1%. However, the desired hardness improving effect cannot be obtained, and when the content exceeds 5%, the wire tends to become brittle, so the content was set to 0.1 to 5%.

(E) W, Cu, and V These components have the effect of further improving the corrosion resistance of the wire, so they are contained as necessary, but if the content is less than 0.1%, the desired corrosion resistance improving effect is obtained. However, if the content exceeds 5%, plastic working becomes difficult, so the content was set to 0.1 to 5%.

(F) Inevitable impurities Since deoxidizers and desulfurizers are used during alloy melting, the inclusion of Mn, Ca, Mg, C, and Si as unavoidable impurities is unavoidable. : 0.1% or less, C
a: 0.1% or less, Mg: 0.05% or less, C: 0.02% or less, and S
If i: 0.1% or less, the characteristics of the wire will not be adversely affected.

〔Example〕

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

Using the usual progressive melting method, melts each having the component composition shown in Tables 1 and 2 were prepared, and the diameter was 30 mm and the length was 20 mm.
Cast into an ingot with a dimension of 0 mm, and make this ingot a hot-rolled wire with a diameter of 9 mm by hot groove roll processing,
This hot-rolled wire is heated to a temperature of 1010 to 1250 ° C, and then repeatedly subjected to water-cooling heat treatment and cold wire drawing to form a cold-rolled wire with a diameter of 0.5 mm, which is then aged at a temperature of 500 to 800 ° C. The Ni-based alloy wire rods 1 to 26 of the present invention and the conventional Ni-based alloy wire rods 1 to 4 were manufactured by applying the above.

The resulting Ni-based alloy wire rods 1-26 of the present invention and the conventional Ni-based alloy wire rods 1-4 were then tested for tensile strength for the purpose of evaluating strength, and micro Vickers hardness for the purpose of evaluating hardness. At 30 ℃ for the purpose of measuring corrosion resistance and evaluating corrosion resistance. The corrosion weight loss was calculated by performing a corrosion test by immersing in a 10 wt% HCl aqueous solution for 48 hours. The results are shown in Table 3.

〔The invention's effect〕

From the results shown in Tables 1 to 3, the present invention Ni-based alloy wire rod 1
It is apparent that all of Nos. 26 to 26 have excellent corrosion resistance equivalent to that of the conventional Ni-based alloy wires 1 to 4 and have much higher strength and hardness.

As described above, the Ni-based alloy wire of the present invention has excellent corrosion resistance, and further has extremely high strength and hardness,
It has industrially useful properties such as excellent performance over a long period of time in a state where it is possible to reduce its weight and diameter.

Claims (8)

[Claims] 1. A composition containing Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and the balance of Ni and inevitable impurities (more than weight%). ) And having a fine precipitation structure of an intermetallic compound, a corrosion resistant Ni-based alloy wire rod having high strength and hardness. 2. Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and Fe: 1 to 20%. A corrosion-resistant Ni-based alloy wire rod having high strength and high hardness, characterized in that the remainder has a composition of Ni and inevitable impurities (at least by weight) and has a fine precipitation structure of an intermetallic compound. 3. Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and further, Co: 0.1 to 5%, A corrosion-resistant Ni-based alloy wire rod having high strength and high hardness, characterized in that the remainder has a composition of Ni and inevitable impurities (at least by weight) and has a fine precipitation structure of an intermetallic compound. 4. Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and one of W, Cu and V. Or two or more: 0.1-5
%, A balance of Ni and unavoidable impurities in the balance (above wt%), and a fine precipitation structure of intermetallic compounds, which has high strength and hardness, and is a corrosion resistant Ni-based alloy. wire. 5. Cr: 12-20%, Mo: 10-20%, Al: 1-3%, Ti: 0.1-2%, Fe: 1-20%, Co: 0.1- Corrosion-resistant Ni base having high strength and high hardness, characterized by containing 5% and a balance of Ni and unavoidable impurities (above wt%) and having a fine precipitation structure of intermetallic compounds. Alloy wire rod. 6. Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and further Fe: 1 to 20%, W, Cu, And one or more of V and: 0.1 to 5
%, A balance of Ni and unavoidable impurities in the balance (above wt%), and a fine precipitation structure of intermetallic compounds, which has high strength and hardness, and is a corrosion resistant Ni-based alloy. wire. (7) Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, and further Co: 0.1 to 5%, W, Cu, And one or more of V and: 0.1 to 5
%, A balance of Ni and unavoidable impurities in the balance (above wt%), and a fine precipitation structure of intermetallic compounds, which has high strength and hardness, and is a corrosion resistant Ni-based alloy. wire. (8) Cr: 12 to 20%, Mo: 10 to 20%, Al: 1 to 3%, Ti: 0.1 to 2%, further Fe: 1 to 20%, Co: 0.1 to 5%, one or more of W, Cu, and V: 0.1 to 5
%, A balance of Ni and unavoidable impurities in the balance (above wt%), and a fine precipitation structure of intermetallic compounds, which has high strength and hardness, and is a corrosion resistant Ni-based alloy. wire.