JPH0256410B2 - - 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 parts 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 metal fibers are mixed into the matrix (FRP, FRM, etc.) to improve the strength, flame retardancy, and abrasion 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 is characterized by having a matrix made of a corrosion-resistant metal and having improved wear resistance by increasing the hardness of this matrix, and its composition range in weight% is Co: 35% Below, Cr: 5-20%, Mo: 1-10%, B: 1-4%, Si: 1-5%, Mn: 2% or less, C: 0.3% or less,
Characterized by the balance consisting of Ni and impurities,
In particular, when used as a lining material for iron or steel cylinders, when the lining layer is formed by casting, Fe is eluted during lining, so the wear-resistant and corrosion-resistant alloy forming the lining layer is In weight%, Co: 35% or less, Cr: 5 to 20%, Mo: 1 to 10%, B: 1 to 4%, Si: 1 to 5%, Mn: 2% or less, C: 0.3% or less, Fe: 25% or less,
It is characterized by consisting of residual Ni 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. Co: 35% or less Co is an effective element for improving the corrosion resistance and castability of the alloy, but if it is too large, it reduces the hardness of the alloy and deteriorates its wear resistance, so it is more desirable to keep it at 35% or less. is preferably in the range of 5 to 20% in view of the balance between corrosion resistance and hardness. Cr: 5-20% Cr is an effective element for improving the corrosion resistance of the alloy, as well as increasing the hardness of the matrix by forming a solid solution in the matrix, and improving the wear resistance of the alloy. If it is less than 20%, the above-mentioned effect will be small, and if it exceeds 20%, no significant improvement in the effect can be expected, and instead the toughness will deteriorate. . 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%, more preferably 1.
It is preferable to set it in the range of ~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%, casting defects are likely to occur, and intermetallic compounds with Co are formed, resulting in embrittlement.
Since it deteriorates the toughness of the alloy, it is set in the range of 1 to 4%. Si: 1-5% Si is an element that increases the hardness of the alloy and improves its flowability, and is particularly effective in ensuring the flowability required when forming the lining by casting. However, if it is less than 1%, such an effect will be small, and if it exceeds 5%, 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 5%. Mn: 2% or less Mn is an element that acts as a deoxidizing agent, and in order to obtain a sufficient deoxidizing effect, it is more desirable to contain it at 0.2% or more. However, if it exceeds 2%, the deoxidizing effect cannot be improved and the toughness is deteriorated, so the content is set to 2% or less. C: 0.3% or less C is an effective element for increasing the hardness of the matrix by forming a solid solution in the matrix, thereby improving the wear resistance of the alloy. but,
If it exceeds 0.3%, corrosion resistance will deteriorate, so the content should be 0.3% or less. Ni: Remaining Ni 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 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, casting methods can be used for the above coating or lining. Examples of the present invention will be described below along with comparative examples. First, five 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 component composition of each test piece was analyzed, the results were shown in Table 1 (Nos. 1 to 5). Further, as a comparative example, nitriding treatment was performed using nitriding steel (SACM 645) also shown in Table 1 (No. 6). Next, the hardness, abrasion resistance, and corrosion resistance of each test piece (Nos. 1 to 6) 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 standard rolls; diameter 30 mm 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 50°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 (Nos. 1 to 5) have significantly lower specific wear amounts than the conventional nitrided steel (No. 6). It is clear that the material has excellent wear resistance, and at the same time, the amount of corrosion is considerably small, indicating that it has excellent corrosion resistance. 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.
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 A wide range of possible raw materials is possible.

Claims (1)

[Claims] 1% by weight: Co: 35% or less, Cr: 5-20%, Mo: 1-10%, B: 1-4%, Si: 1-5%, Mn: 2% or less , C: 0.3% or less, the balance being Ni 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, in which Fe: 1% or less is contained in the impurities. 4 Weight%: Co: 35% or less, Cr: 5-20%, Mo: 1-10%, B: 1-4%, Si: 1-5%, Mn: 2% or less, C: 0.3% or less , Fe: 25% or less,
A wear-resistant and corrosion-resistant alloy characterized by the balance being Ni 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.