JPH0256411B2 - - Google Patents

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. On the other hand, reinforcing materials such as glass fibers, carbon fibers, ceramic fibers, polymer fibers, and alloy fibers are mixed into the matrix (FRP, FRM, etc.) to improve the strength, flame retardancy, and wear resistance of resin molded products or metals. In recent years, there have been many attempts to improve various characteristics such as sex. Therefore, for example, in the cylinder part of an injection molding machine, there is less wear due to the various reinforcing materials and additives added to the resin, and there is less corrosion due to gases generated from the resin and additives. The above strict characteristics are 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. The present 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 particularly suitable for use as a lining material. The wear-resistant and corrosion-resistant alloy according to the present invention has a matrix made of a corrosion-resistant metal and has improved wear resistance by increasing the hardness of this matrix, and its composition range is by weight%: Ni: 35% Below, Cr: 3-15%, Mo: 1-10%, B: 1-4%, Si: 0.9-4%, Mn: 0.2-2%, C: 0.05-0.5%, Co: over 35%, and It is characterized by being composed of impurities, especially when used as a lining material for iron or steel cylinders.
When forming a lining layer by the casting method, Fe is eluted during lining.
The wear-resistant and corrosion-resistant alloy forming the lining layer is, in weight percent, Ni: 35% or less, Cr: 3-15%, Mo: 1-10%, B: 1-4%, Si: 0.9-4%, Mn. : 0.2~2%, C: 0.05~0.5%, Fe: 25% or less, Co: over 35%,
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 alloys, but too much Ni reduces the hardness of the alloy and deteriorates wear resistance. From the viewpoint of hardness balance, it is preferable to set it within the range of 5 to 15%. Cr: 3-15% Cr is an effective element for increasing the hardness of the matrix by solid solution in the matrix and improving the wear resistance of the alloy, but if it is less than 3%, the above effect is small. If it exceeds 15%, the toughness deteriorates, so it is preferably in the range of 3 to 15%, more preferably 5 to 15%. Mo: 1 to 10% Mo is an element that is effective in improving the corrosion resistance of alloys by solid solution in the matrix, but if it is less than 1%, the above effect is small, and if it exceeds 10%, the corrosion resistance will not be improved. 1 to 10%, as it will not be noticeable and will actually deteriorate the workability and make finishing difficult.
More preferably, it is in the range of 1 to 5%. B: 1 to 4% B is an element that is effective in 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 will form intermetallic compounds with Co, causing embrittlement and deteriorating the toughness of the alloy.
The range shall be 4%. Si: 0.9-4% Si is an element that improves the flowability of the alloy.
This element is particularly effective in ensuring the necessary fluidity when forming linings by casting, but if it is less than 0.9%, such an effect is small;
If it exceeds %, it will form an intermetallic compound with Co and become brittle.
Since it deteriorates the toughness of the alloy, it should be in the range of 0.9 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, even if it exceeds 2%, the deoxidizing effect cannot be improved and the toughness will deteriorate on the contrary.
% 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, but if it is less than 0.05%, this element This effect is small, and if it exceeds 0.5%, corrosion resistance will deteriorate, so the content should be in the range of 0.05 to 0.5%. Co: over 35% Co is an element necessary to combine with Cr and B to improve the wear resistance of the alloy and to obtain sufficient corrosion resistance, and was set at over 35%. The wear-resistant and corrosion-resistant alloy according to the present invention has the above-mentioned composition range, but the content of Al in the impurities is 0.2% or less,
It is more desirable that Fe is 1% or less. 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 is eluted during lining and is contained in the alloy. Therefore, if the Fe amount 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 excellent wear resistance and corrosion resistance due to the interaction of the above-mentioned components, and can be coated or lined on the surface of a member that requires wear resistance and corrosion resistance. It is effective in increasing corrosion resistance, and since the alloy has good flowability, a casting method can be used for the above 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 were blended in a magnesia crucible, and heated to 1450 ml in an electric furnace.
After heating and melting at ~1500℃, a plate-shaped test piece was created.
When the composition of each test piece was analyzed, the results were shown in Table 1 (Nos. 1 to 6). 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 corrosion resistance of each test piece (Nos. 1 to 7) were examined, and the results are shown in Table 2. The hardness test was conducted using Rockwell in the examples of the present invention, and Vickers (values converted to Rockwell are shown in parentheses) in the comparative examples. In addition, the abrasion resistance test was carried out using an Okoshi type abrasion tester using a standard roll; diameter 30mm x 3
The specific wear amount was measured under the following conditions: mm, load: 12.6 kg, distance: 200 m. Furthermore, in the corrosion resistance test, the size of the test piece was 2 x 10 x 25 mm, the liquid temperature was 20°C,
In HCl50% aqueous solution and _H2SO450 under the _condition of 24Hr
% aqueous solution.

【table】

[Table] 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 wear resistance compared to the conventional nitrided steel (No. 7). It is clear that it has excellent corrosion resistance as well as a small amount of corrosion. Next, three types (No. 1,
2, 3), outer diameter 100mm, inner diameter 32mm, length
After putting the necessary amount of split pieces of the above alloy into a 1000 mm carbon steel (SC) cylinder to line the inner wall of the cylinder with a wall thickness of 3 mm,
Both ends of the cylinder were sealed, and then placed in a furnace at about 1200°C and heated. After heating, the cylinder was taken out of the furnace, and the cylinder was attached to a centrifuge and cooled to 800°C while rotating, and then The cylinder was slowly cooled to room temperature, and then cut and ground to a predetermined length. As a result, a highly hard wear and corrosion resistant layer is formed on the inner surface of the cylinder, and the analysis results of this wear and corrosion resistant layer are as shown in Table 3. No significant changes were observed in the components except for
It has been observed that Fe elution occurs during lining and the Fe content increases, especially for cylinders that require wear resistance and corrosion resistance, such as injection molding machines for resins and ceramics, mortar pumps, slurry pumps, compressors, etc. I found something suitable for this.
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 cutting could be performed very easily despite the high hardness of the surface, and that machinability was good.

[Table] As explained above, the alloy according to the present invention has extremely excellent wear resistance and corrosion resistance, and is suitable as a member itself that requires wear resistance and corrosion resistance, or as a lining material or coating material. It has a number of excellent effects, such as good flowability, making it easy to form by casting or laminating, and cutting, making it easy to finish after forming or laminating. For example, by using it as a lining material or coating material for cylinders used in injection molding machines, slurry pumps, compressors, etc., it is possible to significantly increase the useful life of the cylinder, and it is also possible to It is possible to expand the types of possible raw materials.

Claims (1)

[Claims] 1% by weight: Ni: 35% or less, Cr: 3-15%, Mo: 1-10%, B: 1-4%, Si: 0.9-4%, Mn: 0.2-2 %, C: 0.05 to 0.5%, Co: exceeding 35%, and impurities. 2. The wear-resistant and corrosion-resistant alloy according to claim 1, in which Al: 0.2% or less is contained in the impurities. 3. The wear-resistant and corrosion-resistant alloy according to claim 1 or 2, wherein Fe: 1% or less is contained in the impurities. 4 Weight%: Ni: 35% or less, Cr: 3-15%, Mo: 1-10%, B: 1-4%, Si: 0.9-4%, Mn: 0.2-2%, C: 0.05- A wear and corrosion resistant alloy characterized by consisting of 0.5%, Fe: 25% or less, Co: over 35%, and impurities. 5. The wear-resistant and corrosion-resistant alloy according to claim 4, in which Al: 0.2% or less is contained in the impurities.