JPS6341973B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention has excellent corrosion resistance and abrasion resistance, as well as excellent castability, and is suitable for use as a current-carrying roll in continuous electroplating lines, etc., which require these properties. This relates to a Ni-based casting alloy. [Prior Art] Conventionally, in the production of energized rolls that are used in environments that come into contact with plating liquid, such as in continuous electroplating lines for steel plates, corrosion resistance against the plating liquid and wear resistance against contact with the steel plate to be plated are required. Due to the demand, many products such as Hastelloy C are used.
Ni-based casting alloy is cast into a tube body by centrifugal casting,
This tubular body is used in a sleeve-shaped state by being machined. [Problems to be solved by the invention] However, in conventional Ni-based casting alloys, those with good corrosion resistance have poor wear resistance, while those with good wear resistance have poor corrosion resistance. There is no such thing as possessing the properties, and therefore,
Currently, the service life reaches its end in about one week to one month at most, and for this reason, the line must be stopped each time to replace the rolls or repolish the roll surfaces, which reduces line operating efficiency. This is a contributing factor. [Means for Solving the Problems] Therefore, from the above-mentioned viewpoint, the present inventors conducted research to develop a material that has both corrosion resistance and wear resistance. % (hereinafter % indicates weight %), Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%. , and further as necessary: (a) Fe: 1 to 10%, (b) one or more of W, Cu, and V: 0.1 to 5%, (c) Co: 0.1 to 5%. Ni-based alloys containing one or more of the above (a) to (c), with the remainder consisting of Ni and unavoidable impurities, exhibit particularly excellent corrosion resistance in electroplating solutions, and , has excellent wear resistance and excellent castability, therefore,
They have found that when used as a sleeve material for current-carrying rolls in continuous electroplating lines that require these properties, for example, they exhibit excellent performance over a long period of time. This invention was made based on the above knowledge, and the reason why the component composition was limited as described above will be explained below. (a) Cr and Mo These components both form a solid solution in the base material to improve its corrosion resistance, and also form intermetallic compounds that are finely dispersed in the base material to improve the wear resistance of the alloy. There are effects, but the content of each
If Cr: less than 25% and Mo: less than 16%, the desired effect cannot be obtained in the above action, while on the other hand, if the content exceeds Cr: 33% and Mo: 23%, casting defects may appear. or cracks may occur during casting, impairing the soundness, so the content should be adjusted accordingly.
Cr: 25-33%, Mo: 16-23%. (b) Si, Mn, and Al These components all have a deoxidizing effect and also have the effect of improving castability, especially melt flowability, when they coexist, but their contents vary depending on their content.
Si: less than 0.1%, Mn: less than 0.1%, and Al: 0.05
If the content is less than 0.8% for Si and 0.8% for Mn, the desired effect cannot be obtained.
If the content exceeds 0.8% and Al: 0.5%, the corrosion resistance of the alloy will decrease.
Al: Set at 0.05-0.5%. (c) Fe Since the Fe component exhibits the same effect as Ni when contained in a specified amount, it is recommended to replace part of Ni with Fe from an economical point of view in order to reduce the cost of the alloy. This can be done if necessary, but if the content is less than 1%, the cost reduction will be small, while if the content exceeds 10%, the corrosion resistance of the alloy will decrease. , the content was set at 1-10%. (d) W, Cu, and V These ingredients have the effect of further improving the corrosion resistance of the alloy, so they are included as necessary especially when even higher corrosion resistance is required, but their content is If it is less than 0.1%, the desired effect of improving corrosion resistance cannot be obtained, while if it is contained more than 5%, no further effect of improving corrosion resistance can be obtained. Therefore, the content was set at 0.1 to 5%. . (e) Co The Co component has the effect of improving wear resistance, so it is included as necessary especially when even higher wear resistance is required.
If the content is less than 0.1%, the desired effect of improving wear resistance cannot be obtained, while if the content exceeds 5%, cracks will occur during casting, so the content was set at 0.1 to 5%. . [Example] Next, the Ni-based casting alloy of the present invention will be specifically explained with reference to Examples. Molten metals having the compositions shown in Table 1 were prepared in an ordinary high-frequency induction furnace in an Ar gas atmosphere, and then centrifugally cast to create an outer diameter of 88 mm.
A sleeve material with dimensions of φ x inner diameter: 48 mm φ x length: 137 mm is used, and then 1150 mm is applied to this sleeve material.
Invention Ni-based alloy castings: 1 to 30 and comparative Ni-based alloy castings 1 were obtained by homogenizing treatment at a predetermined temperature in the range of ~1250°C for a predetermined time in the range of 1 to 10 hours. ~5, and conventional Ni-based alloy castings having compositions corresponding to Hastelloy C were manufactured. Next, the resulting Ni-based alloy castings 1 to 30 of the present invention, comparative Ni-based alloy castings 1 to 5, and the conventional
For the purpose of evaluating the wear resistance of Ni-based alloy castings, the Vickers hardness was measured, and this was used as a sleeve material for the current-carrying roll 1 of the test electroplating line shown schematically in Fig. 1. Used in a glossy state, 30% ZnSO ₄ +
Two guide rolls 2 are immersed in the plating liquid and placed in parallel on the top of a plating tank filled with a plating liquid 3 made of a 1.5% H ₂ SO ₄ aqueous solution heated to 60°C ± 2°C, and one side of the plating tank. The steel plate 6 is moved through another guide roll 2 provided above the side and an energized roll 1 placed above the other side of the plating tank, and during this time the steel plate is passed under operating conditions stricter than the operating conditions in the actual electric plating line. Speed: 100m/min,
The steel plate was electroplated at a current density of 40 A/dm ² , and after 22 hours, the weight loss of the sleeve material was measured, and the presence or absence of metallic luster on the surface was observed. These results are the first
Shown in the table. Note that the weight loss is expressed as a relative percentage with respect to the weight loss of the conventional Ni-based alloy casting sleeve material, which is 100. Also, in Figure 1, 4

【table】

〔Effect of the invention〕

From the results shown in Table 1, Ni-based alloy castings 1 to 30 of the present invention are equivalent to conventional Ni-based alloy castings that exhibit excellent corrosion resistance in this type of corrosive environment.
Or, it is clear that it exhibits superior corrosion resistance, has even higher hardness, and has superior wear resistance. On the other hand, as seen in Comparative Ni-based alloy castings 1 to 5, it is clear that if the content of any of the constituent components falls outside the scope of the present invention, the desired properties cannot be achieved. . As mentioned above, the Ni-based casting alloy of the present invention is
It has excellent corrosion resistance and abrasion resistance, especially in electroplating liquid, and also has excellent castability, so it has been used, for example, as a sleeve for current-carrying rolls in a continuous metal plating line for steel plates. In some cases, it exhibits a significantly long service life, thereby prolonging the continuous operation time of the metsuki line, and bringing about industrially useful effects such as helping to improve the line operating rate.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a test electroplating line. 1... Current-carrying roll, 2... Guide roll, 3... Plating liquid, 4... Consumable anode, 5... Plating liquid sealing rubber plate, 6... Steel plate.

Claims (1)

[Claims] 1 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and the rest is Ni. A Ni-based casting alloy for current-carrying rolls with excellent corrosion resistance and wear resistance, characterized by having a composition (the above weight %) consisting of unavoidable impurities. 2 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and further contains Fe: 1-10%. A Ni-based casting alloy for current-carrying rolls having excellent corrosion resistance and abrasion resistance, characterized by having a composition (by weight %) with the remainder consisting of Ni and unavoidable impurities. 3 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and further contains W, Cu, and V. One or more of the following: 0.1 to 5%, with the remainder consisting of Ni and unavoidable impurities (weight percent): Ni for current-carrying rolls with excellent corrosion resistance and abrasion resistance. Base casting alloy. 4 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and further contains Co: 0.1-5%. A Ni-based casting alloy for current-carrying rolls having excellent corrosion resistance and abrasion resistance, characterized by having a composition (by weight %) with the remainder consisting of Ni and unavoidable impurities. 5 Contains Cr: 25 to 33%, Mo: 16 to 23%, Si: 0.1 to 0.8%, Mn: 0.1 to 0.8%, Al: 0.05 to 0.5%, and further Fe: 1 to 10%, Corrosion and wear resistance characterized by having a composition (weight %) containing one or more of W, Cu, and V: 0.1 to 5%, with the remainder consisting of Ni and unavoidable impurities. Ni-based casting alloy for current-carrying rolls with excellent properties. 6 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and further contains Fe: 1-10%, A Ni-based casting alloy for current-carrying rolls having excellent corrosion resistance and wear resistance, characterized in that it contains Co: 0.1 to 5%, and the remainder is Ni and unavoidable impurities (weight percent). 7 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and further contains W, Cu, and V. Corrosion and wear resistance characterized by having a composition (weight %) of one or more of the following: 0.1 to 5%, Co: 0.1 to 5%, and the remainder consisting of Ni and unavoidable impurities. Ni-based casting alloy for current-carrying rolls with excellent properties. 8 Contains Cr: 25-33%, Mo: 16-23%, Si: 0.1-0.8%, Mn: 0.1-0.8%, Al: 0.05-0.5%, and further Fe: 1-10%, Contains one or more of W, Cu, and V: 0.1 to 5%, Co: 0.1 to 5%, and the remainder is Ni and unavoidable impurities (weight %). A Ni-based casting alloy for current-carrying rolls with excellent corrosion resistance and wear resistance.