JPS5919180B2 - Damping steel with high vibration damping ability - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration damping steel having a large vibration damping ability suitable for suppressing vibration and noise in various mechanical devices and structures.

Recently, the problems of vibration and noise pollution have become more and more serious, and it has been pointed out that it is necessary to reduce vibrations and noise as much as possible at their sources.

For this purpose, the structural material itself must have a high vibration damping ability, and it is not possible to satisfy the requirements for mechanical strength, etc. by simply trying to allocate vibration using rubber, plastics, or a combination of these and metal materials. In many cases, it is not.

Under these circumstances, metal materials with excellent vibration damping ability and strength are desired, and Mn-Cu alloys, Mg alloys, Fe
CSi cast iron etc. were developed.

However, MnCu alloy shows high vibration damping ability only in a narrow temperature range around room temperature, and Mg alloy has low strength.
In addition, Fe-C-8i cast iron has drawbacks such as difficulty in cold working such as cold rolling and press working, making it impractical.

Cr: 3~
40%, C: 0.15% or less, Si: 2.5% or less, M
n: 1% or less, Al: 4% or less, Ti: 0.02-1.
Anti-vibration steel having a high vibration damping ability was developed, consisting of 0% Fe and unavoidable impurities during manufacturing (Japanese Patent Application No. 51-61813, Japanese Patent Application Laid-open No. 52-144317).

At this point, it was considered necessary to add 3% or more of Cr.

The present inventors further aim to develop an inexpensive anti-vibration steel with less than 3% C and r, and in particular, it has good mechanical properties and workability even with improved vibration damping ability, and is suitable for use as a mechanical material for vibration allocation or as a structural material. As a result, we provide vibration damping steel that exhibits unprecedented effects.

In other words, the present inventor found that in (carbon) steel, C is harmful to vibration damping properties, Si and Mn are harmful to vibration damping properties above a certain limit, and a small amount of Cr and a trace amount of Ti are harmful to vibration damping properties. The present invention was completed by discovering that the addition of at least one of , Nb , Ta , Zr , V, and Hf is effective in improving the allocation property.

According to the present invention, a steel containing essentially Fe and unavoidable impurities during manufacturing, up to 2% Si, up to 1% Mn, with a C content of 0.1% or less, and 0.1 to 3% %Cr and 0
．． 01-1% Ti, Nb.

One or more of T a * Z r + V s Hf
A vibration damping steel having high vibration damping ability containing two or more types of 'i' is provided.

The reason why the composition of the steel of the present invention is limited as described above is as follows.

In the present invention, Cr is an essential element, and at least 0.1% is required to achieve the purpose.

In addition, conventional knowledge of CrVi was thought to require 3% or more for this purpose, but as a result of limiting the amount of C25i, it was found that the purpose could be achieved even with less than 3%, so the upper limit was changed to 3%. less than %.

Ti, Nb, Ta, Zr, V, HfI/i are characteristic elements of the steel of the present invention; it has been discovered that the addition of small amounts of these elements is effective in improving the vibration damping properties of the steel. 1. The effect is apparent from about 0.01%, but if it exceeds 1%, the vibration damping ability will deteriorate, the surface texture will still be poor, manufacturing will be difficult, and it will be economically disadvantageous.

Although five of these elements, Ta and Hf, are unlikely to be used alone, they may exist as accompanying elements of Nb and Zr, and all of them are equivalent.

C is extremely harmful to the vibration damping ability of steel, and its content needs to be suppressed to 0.21% or less, and is preferably as low as possible.

Si is used as a deoxidizer and remains in the steel above 0.01%, which is desirable, but above 2% it reduces the vibration damping ability of the steel.

Mn is also used as a deoxidizing agent and desulfurizing agent, and Mn remaining in steel
is effective in improving strength and is sometimes added in large amounts,
Regarding vibration damping ability, it is harmful and must be suppressed to 1% or less.

The reason may be that Mn is an austenite forming element.

Its preferred content is 0.2-0.6%. Among the impurities, Al is allowed up to less than 0.1%.

Regarding P and S, up to 0.03% is allowed.

Cu and Ni are unavoidable as long as scrap is used as a raw material, and if they are less than 0.5%, they do not affect the vibration damping ability of the steel of the present invention.

The vibration damping ability of the distributed steel of the present invention having the above component range is also affected by the annealing treatment.

In other words, it is necessary to remove as much internal strain as possible due to cold working, and it has been found that annealing at a temperature of 700° C. or higher is appropriate.

Examples will be described below.

Steel with the chemical composition shown in Table 1 is melted, and after hot rolling, the plate thickness is 3 m.
It was made into a hot rolled sheet of m.

After pickling, this hot-rolled sheet was cold rolled and annealed to a thickness of 0.
A cold-rolled annealed plate of 55 mm was obtained, and further cold-rolled to obtain a cold-rolled plate of 0.50 mm in thickness.

Width 101n7ft, length 100m from each obtained cold-rolled plate
Cut out test pieces of m, and test them at 750℃, 800℃, and 85℃ respectively.
After final annealing at 0°C, 900°C, and 950°C for 4 hours, torsional vibration was applied and the energy attenuation rate (ΔW/W) was measured.

At that time, since the vibration energy attenuation rate of such steel depends on the strain amplitude, the maximum shear stress on the specimen surface is 1.5 k.
The vibration energy attenuation rate was measured under the condition of g/m7IL.

The results are shown in Table 2.

In addition, the display method of vibration energy damping capacity in Table 2 is JIS
Sample A17, which is equivalent to type 1 C3PCC (cold rolled steel plate), was
Vibration energy attenuation rate (ΔW/
It is expressed as a comparison value (D/Do) with the vibration energy attenuation rate (ΔW/W=D) of other samples when W=Do) is 1.

Further, tensile strength and elongation were tested using JIS standard No. 5 tensile test pieces after final annealing at 850°C for 4 hours.

As is clear from the results in Table 2, it can be seen that the steel of the present invention has superior vibration damping ability compared to the comparative steel.

In particular, Cr tTi, Nb, which are characteristic elements of the present invention
It is clear that the effects of yZr and V on improving the vibration damping ability are extremely large.

As is clear from the above, the present invention significantly improves the vibration damping ability of steel with good mechanical strength and workability, and can be applied to mechanical equipment, structural members, etc. to prevent vibration noise. It exhibits unprecedented effects as a mechanical material for allocation and as a structural member.

Claims (1)

[Claims] 1 Essentially Fe and unavoidable manufacturing impurities and 2%
Steel containing up to 1% Si, up to 1% Mn, and up to 0 C
．． 1% or less, Cr of 0.1% or more and less than 3%, T t of 0.01 to 1% in total, Nb t's"atZr,
A vibration damping steel characterized by having high vibration damping ability by containing one or more of V and Hf.