JPS6013043A - Wear- and corrosion-resistant alloy - Google Patents

Abstract

PURPOSE:To provide a titled alloy suitable as a lining material for the part where resistance to wear and corrosion is required by consisting said alloy of specifically composed Ni, Cr, Mo, B, Si, Mn, C and Co, etc. CONSTITUTION:A wear- and corrosion-resistant alloy contains <=35wt% Ni, 3-15% Cr, 1-10% Mo, 1-4% B, 0.9-4% Si, 0.2-2% Mn, 0.05-0.5% C and if necessary contg. <=25% Fe and consists of the balance Co and impurities, which impurities consist preferably of <=0.2% Al and <=1% Fe. The above-mentioned alloy is formed by using a corrosion-resistant metal consisting of Ni, Mo, Co, etc. as a matrix and solutionizing or combining Cr, B, C, etc. with said matrix to improve the hardness and wear resistance of the matrix. It is necessary to prevent the decrease in hardness by regulating the Fe to be eluted into the alloy to <=25% in the case of lining the alloy to iron, steel, etc. by a casting method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alloy with excellent wear resistance and corrosion resistance, and particularly to an abrasion and corrosion resistant alloy suitable as a lining material for parts where wear resistance and corrosion resistance are required.

Examples of members that require wear resistance and corrosion resistance include cylinders used in injection molding machines, slurry pumps, compressors, and the like.

-4, glass #j fiber, carbon fiber, ceramic w1 fiber, polymer m! In recent years, there have been many attempts to improve the strength, flame retardance, wear resistance, and other properties of resin molded bodies or metals by incorporating reinforcing materials such as metal m#I (FRP, FRM, etc.). It's coming. therefore,
For example, the cylinder part of an injection molding machine has stricter characteristics than before, such as less wear due to the various reinforcing materials and additives added to the resin, and less corrosion due to gases generated from the resin and additives. is required.

By the way, the cylinders in conventional resin injection molding machines have been made of nitrided steel and have had their surfaces nitrided to improve their wear resistance, but because the hardened layer is thin, the wear resistance has been improved. It also had the disadvantage of insufficient corrosion resistance.

This invention was made to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a wear-resistant and corrosion-resistant alloy that has excellent wear resistance and corrosion resistance and is suitable for use as a lining material.

The wear-resistant and corrosion-resistant alloy according to the present invention is characterized by having corrosion-resistant metal as a matrix and improving wear resistance by increasing the hardness of this matrix, and its composition range in weight% is Ni: 35% Below, Cr: 3-1
5%, Mo: 1-10%, B: 1-4%, Si: 0.9-4%, Mn: 0.2-2%, C: 0.0
When used as a lining material for iron or steel cylinders, when the lining layer is formed by a casting method, the lining layer is formed by a casting method. The wear-resistant and corrosion-resistant alloy that forms the lining layer is
In weight%, N'i: 35% or less, Cr: 3 to 15%, M
ail ~10%, B: 1-4%, Si: 0.9-4%, Mn: 0.2-2%, C: 0.0
5% to 0.5%, Fe: 25% or less, and the balance consists of CO and impurities.

Next, the reason for limiting the composition range (wt%) of the wear-resistant and corrosion-resistant alloy according to the present invention will be explained.

Ni: 35% or less Ni is an effective element for improving the corrosion resistance of the alloy, but if it is too large, it reduces the hardness of the alloy and deteriorates the wear resistance. In view of the balance between hardness and hardness, the range is preferably 5 to 15%.

Cr: 3-15% Cr is an element that is effective in solidly dissolving in the matrix to increase the hardness of the matrix and improve the wear resistance of alloy 1, but if it is less than 3%, the above effect is small. , 15
%, the toughness deteriorates, so it is preferably in the range of 3 to 15%, more preferably 5 to 15%.

Mo: IN10% Mo is an effective element for improving the corrosion resistance of the alloy by solid solution in the matrix, but if it is less than 1%, the above effect is small, and even if it exceeds 10%, the improvement in corrosion resistance is not noticeable. 1 to 1, because the processability is deteriorated and finishing process is difficult.

%, more preferably in the range of 1 to 5%.

B: 1-4% B is an effective element for combining with Co, Ni, and Cr to form boride, increasing the hardness of the alloy and improving wear resistance, but if it is less than 1%, this element This effect is small, and if it exceeds 4%, it forms an intermetallic compound with Co, causing embrittlement and deteriorating the toughness of the alloy, so it is set in the range of 1 to 4%.

Si: 0.9'N4% Si is an element that improves the flowability of the alloy, and is particularly effective in ensuring the flowability required when forming the lining by casting. If it is less than 9%, such effect will be small, and if it exceeds 4%, it will create intermetallic compounds with CO, causing embrittlement and deteriorating the toughness of the alloy.
．． The range is 9% to 4%.

Mn: 0.2-2% Mn is an element that acts as a deoxidizing agent, and in order to obtain a sufficient deoxidizing effect, it needs to be 0.2% or more. However, if it exceeds 2%, the deoxidizing effect cannot be improved and the toughness will deteriorate, so the content should be 2% or less.

C: 0.05-0.5% C is an element that is effective in solidly dissolving in the matrix and increasing the hardness of the matrix, thereby improving the wear resistance of the alloy. If the content is less than 0.5%, such an effect will be small, and if it exceeds 0.5%, the corrosion resistance will deteriorate, so the content should be in the range of 0.05 to 0.5%.

CO: The remaining Co is an element necessary to combine with Cr and B to improve the wear resistance of the alloy and obtain sufficient corrosion resistance.
The remainder of the alloy.

The wear-resistant and corrosion-resistant alloy according to the present invention has the above-mentioned composition range, but AJI in the impurities is 0.2% or less, Fe
It is more desirable that Fe is 1% or less, and when this alloy is used as a lining material for an iron or steel cylinder and a lining layer is formed by a casting method, Fe elution may occur during lining. It will be included in the above alloy. Therefore, if the Fe content exceeds 25% in this wear-resistant and corrosion-resistant alloy, the hardness will decrease and the wear resistance will deteriorate, so the Fe content needs to be 25% or less.

The alloy according to the present invention has the following properties due to the interaction of the above components:
It has excellent wear resistance and corrosion resistance, and is effective for coating or lining the surface of parts that require wear resistance and corrosion resistance to increase the wear and corrosion resistance of the parts. Because of its good coating or lining properties, a casting method can be used for the coating or lining.

Examples of the present invention will be described below along with comparative examples.

First, six types of alloy components according to the first invention of the present invention are mixed in a magscrew crucible, and heated to a temperature of 1450 to 150 in an electric furnace.
After heating and melting at 0°C, plate-shaped test pieces were created and the component composition of each test piece was analyzed, as shown in Table 1 (No. 1 to 6).
The results are shown in.

Further, as a comparative example, nitriding treatment was performed using nitriding steel (SACM 645) shown in Table 1 (No. 7).

Next, the hardness, abrasion resistance, and
When the corrosion resistance was investigated, the results were shown in Table 2. The hardness test was performed using Rockwell hardness in the examples of the present invention, and Vickers hardness testing in the comparative examples (values converted to Rockwell hardness are shown in parentheses). In addition, the abrasion resistance test was performed using an Okoshi type abrasion tester, standard roll: diameter 30 mm x 3 II 1 m, load: 12.6 kg, distance: 2
The specific wear amount was measured under the condition of 00 m. Furthermore, in the corrosion resistance test, the size of the test piece was 2 x 10 x 25 m,
The experiments were carried out in a 50% HCu aqueous solution and a 50% H2SO aqueous solution at a liquid temperature of 20°C and 24 hours.

Table 2 As shown in Tables 1 and 2, the alloys according to the present invention (No. 1 to 6) have a smaller specific wear amount and better wear resistance than the conventional nitrided steel (No. 97). At the same time, it is clear that the amount of corrosion is small and the corrosion resistance is also excellent.

Next, three types of alloys (NOol, 2.
3), outer diameter 100+w+*, inner diameter 32101,
After putting the necessary amount of split pieces of the above-mentioned alloy to line the inner wall surface of the cylinder with a thickness of 3+ am into a cylinder made of carbon steel (S C) having a length of 1000 mm, both ends of the cylinder were placed. After that, the cylinder was placed in a furnace at about 1200°C and heated, and after heating, the cylinder was taken out from the furnace, and the cylinder was attached to a centrifuge and rotated at 800°C.
C, and then gradually cooled to room temperature, and then the cylinder was finished by cutting and grinding to a predetermined length. As a result, a highly hard wear-resistant and corrosion-resistant layer is formed on the inner surface of the cylinder, and the analysis results of this wear-resistant and corrosion-resistant layer are shown in Table 3. No significant change in the removed components was observed, but Fe elution occurred during lining and the Fe content increased, especially in injection molding machines for resins and ceramics, mortar pumps, slurry pumps, compressors, etc. A product suitable for cylinders that require wear resistance and corrosion resistance was obtained. The lining thickness on the inner surface of the cylinder is extremely uniform, and the melt flowability is good, making it an extremely excellent alloy for linings made by centrifugal casting. It was also confirmed that the inner surface could be cut very easily despite the high hardness of the surface, and that the material had good machinability.

As explained above, the alloy according to the present invention has extremely excellent wear resistance and corrosion resistance, and is suitable as a part itself where wear resistance and corrosion resistance are required, or as a lining material or coating material. It has a number of excellent effects, such as easy molding or lamination by casting due to its good flowability, and easy finishing processing after molding or lamination because it can be cut. For example, by using it as a lining or coating material for cylinders used in injection molding machines, slurry pumps, compressors, etc., it is possible to significantly increase the service life of said cylinders, and it is also possible to significantly increase the service life of said cylinders. It is possible to expand the types.

Patent applicant: Daido Steel Co., Ltd. Representative Patent Attorney Yutaka Shio 213-

Claims (5)

[Claims] (1) In weight%, Ni: 35% or less, Cr: 3-15%, Mail ~10%, B: 1-4%
, Si: 0.9-4%, Mn: 0.2-2%, C: 0
．． 0.05 to 0.5%, the balance being Co and impurities. (2) The wear-resistant and corrosion-resistant alloy according to claim C1), in which lQ: 0.2% or less in impurities. (3) The wear-resistant and corrosion-resistant alloy according to claim (1) or (2), in which the impurity contains 1% or less of Fee. (4) Ni+35% or less in weight%. Cr: 3-15%, Mail ~10%, B: 1-4%
, St: 0.9-4%, Mn: 0.2-2%, C
: 0.05 to 0.5%, Fe: 25% or less, and the balance is CO and impurities. (5) The wear-resistant and corrosion-resistant alloy according to claim (4), in which AM: 0, 2% or less in impurities.