JPS58210143A - Wear resistant alloy of high toughness - Google Patents

Abstract

PURPOSE:To obtain a wear resistant alloy of high toughness suitable for use as the material of various sliding parts, etc. by blending Ni with specified amounts of Cr, Nb, Mo and Fe. CONSTITUTION:This wear resistant alloy with high toughness consists of, by weight, 10-45% Cr, 3-15% Nb, 4-20% Mo, 2-15% Fe and the balance Ni. Nb in the alloy composition reacts with Ni, strengthening the alloy matrix and enhancing the wear resistance. Fe strengthens the matrix and enhances the toughness. Nb is added by said amount causing no reduction of the toughness and no deterioration of the mechanical strength. The wear resistant alloy has small wear and abrasion losses and superior build-up weldability, and it contains no Co, so the alloy is suitable for use as a material for various plants such as chemical and nuclear power plants and as the material of sliding parts of various machines.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention is directed to a high-pressure plate suitable for pulp faces of various plants such as chemistry and atomic couplants, parts of jet pumps, and sliding parts of various machines. Concerning toughness and wear-resistant alloys.

[Prior art and its problems]

Conventionally, Co-Cr-Ni-W has been used as a wear-resistant alloy.
alloys (commonly known as stellite) were widely used,
Recently, wear-resistant alloys based on N1 have been developed from the viewpoint of depleting cobalt resources, controlling reactions in chemical plants, and improving the safety of atomic couplants.

However, this newly developed Ni-based wear-resistant alloy is still used in the conventionally used Co-based alloy (commonly known as Stellite).
The wear resistance is not sufficient compared to

In view of the above points, the present inventors have conducted extensive research and have discovered that a chromium-niobium-molybdenum-iron-nickel alloy has the required wear resistance and can be used as structural members for the various plants described above. I found out that

[Purpose of the invention]

Based on the above findings, the present invention aims to provide a high-toughness, wear-resistant alloy suitable for pulp face parts, jet pump parts, sliding parts of various machines, etc. in various plants.

[Summary of the invention]

To explain the present invention in detail below, the high toughness and wear resistant alloy of the present invention has a heavy acid ratio of chromium of 10 to 45% and niobium of 3 to 15%.
%, molybdenum 4-20%, iron 2-15%, and the balance nickel.

〔Effect of the invention〕

As mentioned above, the high toughness wear-resistant alloy of the present invention is a chromium-niobium-molybdenum-iron-nickel system, and its composition ratio is 10 to 45 parts chromium, 3 to 15 parts niobium, 4 to 20 Ls molybdenum, 2 to 2 parts iron. It is necessary to select 15% and the rest of nickel, and the reason for this is 1 as follows. First of all, chromium is a necessary component to strengthen corrosion resistance and the matrix of the alloy.If the composition ratio is less than 1ocIb, the effect is insufficient, and if it exceeds 45%, a coarse primary crystal phase will precipitate at temperature and the required resistance will be reduced. Abrasion resistance cannot be obtained. Niobium is a component that reacts with nickel and contributes to strengthening the alloy base and improving wear resistance, but if the amount is less than 3%, the effect is insufficient, and if it exceeds 15%, a decrease in toughness is observed. This is because the mechanical strength of the material is impaired. Molybdenum is fi! 4 contributes to improving corrosion resistance, strengthening the alloy matrix, and improving wear resistance, and if the amount is less than 4, the effect is insufficient.
This is because the toughness of the alloy decreases when the temperature exceeds 500.

Iron is a component that contributes to strengthening and improving the toughness of the base material, but if its heat content is less than 2%, its effect is insufficient, and if its strength exceeds 15%, the strength of the base material decreases, and the strength of the alloy decreases. This is because mechanical strength is impaired.

Thus, in the wear-resistant alloy according to the present invention, a portion of niobium may be replaced with tantalum. -Maku, some of the molybdenum is replaced with tungsten! You can also buy.

Furthermore, it may contain manganese, silicon, or the like as a deoxidizing and denitrifying agent that is added during melting.

[Fruit of invention 11f! Example A] First, an alloy having the composition shown in Table IK (1 g of salt) was prepared, and after melting and casting using a high frequency air induction melting furnace, a test piece was cut out from this cast product and a characteristic evaluation test was conducted.

At this time, two evaluation tests were carried out: an ultrasonic e test, a vibration test using Capiteshi W/Erosion testing, an Amsler mK wear test, and a Charpy impact table test.

The capitol erosion test is 3 in accordance with the School Loss Act.
The results of the test are shown in Table 1. In addition, the wear and tear in Table 1 is the decrease in the density of the test piece due to the first test (
mg) divided by the test time (minutes) and density (g/7) multiplied by 1XIO3, which indicates the amount of volume reduction per hour.

The wear test using the Amsler type was carried out using a test load of 30 kg and water (I CC
/second). The results are also shown in Table-1. Note that the wear ridge in Table IK indicates the amount of weight loss (Ing) of the test piece due to the test. In the Charpy impact test, a model with a capacity of 30 was ruptured by impact with a hammer of 9, and the energy absorbed at that time was determined. The results are also shown in Table 11C. The absorbed energy in the same table - IK indicates the absorbed energy (kg-m) of the test piece in the test.

For the surface length -1, cases of a nickel-chromium-boron self-fluxing alloy (Comparative Example 4) and a nickel-chromium-molybdenum-silicon alloy (Comparative Example 5) for reducing the ratio by 1 are also shown.

Margin Table-1 When the alloy of the present invention is overlay welded to a 113Cr-8Nl stainless steel plate, 6,000 degrees of thermal stress is applied to the 18Cr-8Ni stainless steel plate, but solution treatment is performed to remove this. It does not affect the mechanical properties of the alloy of the present invention.Also, when overlay welding the alloy of the present invention to a carbon steel plate, a slight thermal effect is applied to the carbon steel plate, but in order to eliminate this, The austenitizing treatment and tempering do not affect the mechanical properties of the alloy according to the invention.

By adding 2 to 15 inches of iron to the alloy of the present invention, it is possible to reduce the increase in wear and tear and wear and tear, and at the same time increase absorbed energy, which is contrary to these characteristics, and improve toughness. did it. In addition, it can reduce galling and seizure, which are the causes of damage characteristic of valve seat materials. Valve seats that require quick shutoff, such as check valves and gate valves, are prone to galling. This is particularly effective since it is easy for this to occur.

As is clear from the above test results, the wear-resistant alloy according to the present invention has less wear and tear than the comparative example, has excellent overlay weldability, and does not contain cobalt. It can be said to be suitable for use in plants and as a material for forming sliding lines in various machines.

Representative patent attorney Kensuke Norichika (1 person)

Claims (1)

[Claims] A high-toughness wear-resistant alloy characterized by being made of 10-45% chromium, 3-15% niobium, 4-20% molybdenum, 2-15% iron, and the balance nickel.