JPH0327618B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an alloy with excellent wear resistance and corrosion resistance, and in particular 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 resin molding machines, slurry pumps, compressors, and the like. On the other hand, reinforcing materials such as glass fiber, carbon fiber, and metal fiber are mixed into the resin molding (FRP,
In recent years, there have been many attempts to improve the strength, flame retardance, abrasion resistance, and other properties of resin molded products (FRM, etc.). Therefore, the cylinder part of a resin molding machine has stricter characteristics than before, such as less wear due to reinforcing materials and additives added to the resin, and less corrosion due to gases emitted from the resin and additives. required. By the way, the cylinders in conventional resin molding machines have been made of nitrided steel and have their surfaces nitrided to improve their wear resistance, but due to the thinness of the hardened layer, the wear resistance and It had the disadvantage of insufficient corrosion resistance. The present invention was made in order 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 is characterized in that the matrix is made of a metal having corrosion resistance, and the wear resistance is improved by increasing the hardness of this matrix, and the composition range is as follows:
Ni: 35% or less, Cr: 3-15%, Mo: 1-10%,
B: 1-4%, Si: 1-4%, Mn: 0.2-2%,
It is characterized in that the remainder essentially consists of Co. 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-mentioned hardening will be 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: 1-4% 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 will form an intermetallic compound with Co, causing embrittlement and deteriorating the toughness of the alloy.
-4% range. Si: 1-4% Si is an element that improves the flowability of the alloy.
It is an effective element to ensure the necessary fluidity, especially when forming by lining casting.
If it is less than 1%, such an effect will be small, and if it exceeds 4%, it will form an intermetallic compound with Co, causing embrittlement and deteriorating the toughness of the alloy, so it should be in the range of 1 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. Co: Remainder 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 used as the remainder of the alloy. The alloy according to the present invention has excellent wear resistance and corrosion resistance due to the interaction of the above components,
It is effective for coating or lining the surface of parts that require wear resistance and corrosion resistance to increase the wear resistance and corrosion resistance of the parts.Since the alloy has good flowability, casting methods are often used for the above coating or lining. It is something that can be used. Examples of the present invention will be described below along with comparative examples. First, six types of alloy components of the present invention were mixed in a magnesia crucible, heated and melted at 1450 to 1500°C in an electric furnace, and plate-shaped test pieces were created.The component composition of each test piece was analyzed. The results are shown in the table (Nos. 1 to 6). Also, as a comparative example, the first
Nitriding treatment was performed using the nitriding steel (SACM645) shown in Table (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 with Vickers in the comparative examples. In addition, the abrasion resistance test was carried out using an Okoshi type abrasion tester, using a standard roll; diameter 30 mm x 3 mm;
The specific wear amount was measured under the conditions of load: 12.6 kg and distance: 200 m. Furthermore, the corrosion resistance test was conducted using a test piece with a size of 2 x 10 x 25 mm at 20°C and 24 hours.

【table】

[Table] As shown in Tables 1 and 2, the alloys according to the present invention (No. 1 to 6) are different from the conventional nitrided steel (No. 7).
It is clear that both have a small specific wear amount and excellent wear resistance, as well as a small amount of corrosion and excellent corrosion resistance. Next, three types (No. 1,
3, 5), 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-resistant and corrosion-resistant layer is formed on the inner surface of the cylinder, which is especially useful for resin molding machines, mortar pumps, slurry pumps, etc.
A product suitable for cylinders that require wear resistance and corrosion resistance, such as compressors, 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 cutting could be performed 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 member itself that requires wear resistance and corrosion resistance, or as a lining material or coating material. Since it has good flowability, it can be easily formed by casting or laminated, and it can also be cut, so it has many excellent effects such as easy finishing after molding or lamination.

Claims (1)

[Claims] 1% by weight, Ni: 35% or less, Cr: 3-15%,
Mo: 1-10%, B: 1-4%, Si: 1-4%,
A wear-resistant and corrosion-resistant alloy characterized by consisting of Mn: 0.2 to 2%, and the remainder substantially consisting of Co.