JPH07103446B2 - Tension material for oil ring and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a tension member for an oil ring used as a tension member (expander, spacer) for an oil ring such as a brazing ring and a pressure ring. And the manufacturing method thereof, improving the formability, tension and heat settling property required for stainless steel flat wire used as a material for tension material, and also realizing simplification of the flat wire processing process. The present invention relates to a tension material for an oil ring and a manufacturing method thereof.

(Prior Art) Generally, stainless steel flat wire used as a tension material for an oil ring has good corrosion resistance from the use environment.
It is required to have high strength at high temperature, low temperature brittleness, and excellent properties peculiar to tendons.

The characteristics peculiar to the tension material in the stainless steel that is the material of the tension material are, for example, in the case of the rickbent spacer, the moldability is such that cutting and cracks do not occur when molding into a tooth-shaped uneven shape. It is required to be good, have a high tension after molding, have little variation in tension, and have good heat-resistant settling property of the tension material (small decline rate).

As stainless steel that satisfies such required characteristics,
Conventionally, SUS201 or SUS304 was adopted, and in order to obtain hardness Hv180-230 after cold flat wire processing, it was subjected to solution heat treatment at a temperature of 900-1050 ° C and then formed into an oil ring melt tension material. .

(Problems to be Solved by the Invention) However, in such a conventional tension member for an oil ring made of stainless steel, the tension is likely to vary, and the tension during the solution treatment is insufficient due to incomplete solution heat treatment. There was a risk of problems in moldability and heat settling due to martensite and insufficient heat settling.

Therefore, in order to improve the above problems, SUS201 or SUS304
After performing cold working with a working rate of 20% or more on the stainless steel of, the solution heat treatment is performed at 950 to 1050 ° C, and then cold working with a working rate of 3 to 10% is again performed.
Although a manufacturing method that satisfies the above required characteristics is adopted, it is necessary to adjust the solution heat treatment temperature or the processing rate after solution heat treatment due to the variation in the structure of the material.
And in some cases, there is a risk that part of the structure will change from austenite structure to pseudo-martensite structure during forming due to incomplete solution heat treatment, which may adversely affect formability and heat resistance. In addition, there is a problem that the manufacturing process is complicated and may be expensive.

(Object of the Invention) The present invention has been made by focusing on the above-mentioned conventional problems, since the moldability is good, breakage and cracks are less likely to occur after molding, and the tension after molding is high, It is an object of the present invention to provide a tension material for an oil ring and a method for producing the tension material, which have remarkably excellent characteristics such that there is little variation in tension and good heat settling property (reduction rate is small).

[Structure of the Invention] (Means for Solving the Problems) The tension member for an oil ring according to the present invention is C: 0.
01-0.30%, Si: 0.1-2.0%, Mn: 1.0-6.0%, P: 0.03%
Below, S: 0.03% or less, Ni: 8-16%, Cr: 16-22%, N: 0.0
5 to 0.35%, Al: 0.05% or less, Mg: 0.001 to 0.05%, Ca: 0.0
01-0.05%, and if necessary Cu: 1.0-4.0%, Mo: 0.5
~ 1% or 2% of 5.0%, also V:
One or more of 0.03 to 0.30%, Ti: 0.03 to 0.30%, Nb + Ta: 0.03 to 0.30%, stainless steel having a composition consisting of balance Fe and unavoidable impurities It is a thing.

Further, the method for manufacturing a tension member for an oil ring according to the present invention, after hot rolling the stainless steel having the above composition at a temperature of 1000 to 1200 ° C., cold working by cold rolling or cold drawing is performed. Then, after solution heat treatment at 950-1200 ℃, cold-rolled steel is slit into the required width when cold rolling to make a flat wire for oil ring, and when cold-drawing it requires cold After being processed, it is characterized in that it is subjected to solution heat treatment at 950 to 1200 ° C to obtain a flat wire for an oil ring, and the flat wire for an oil ring is formed into a tension material for an oil ring.

Then, in the method for manufacturing a tension member for an oil ring according to the present invention, the stainless steel having the above composition is 1000 to 12
It also includes the case where hot rolling is performed at a temperature of 00 ° C, solution treatment is performed at 950 to 1150 ° C, and then cold working by cold rolling or cold drawing is performed. It also includes the case where after molding into a tension material for an oil ring, a setting process is performed at 400 to 600 ° C.

Next, the reasons for limiting the component range (% by weight) of the stainless steel that is the material of the tension material for an oil ring according to the present invention will be described.

C: 0.01 to 0.30% C forms a solid solution in the mother phase to strengthen the matrix, and also acts strongly as a carbonitride forming element. Moreover, it has a great effect of stabilizing austenite and suppressing the processing-induced martensite. Therefore, in order to obtain such an effect, 0.01%
That's it. However, if it exceeds 0.30%, it becomes difficult to form a solid solution, and cold workability and corrosion resistance are significantly deteriorated, so the upper limit was made 0.30%.

Si: 0.1 to 2.0% Si is added as a deoxidizing agent during steel making, and is 0.1% or more to obtain such an action. However, if it exceeds 2.0%, ferrite is likely to be formed, so the upper limit was made 2.0%.

Mn: 1.0 to 6.0% Mn is added as a deoxidizing and desulfurizing agent during steelmaking, and also has the effect of increasing the solubility of N and suppressing the work-induced martensite. Added more than 1.0%. However, if it exceeds 6.0%, the workability deteriorates and the corrosion resistance deteriorates, so the upper limit was made 6.0%.

P: 0.03% or less Since P deteriorates corrosion resistance, it is preferable that the amount is as small as possible, and the upper limit was made 0.03%.

S: 0.03% or less S impairs hot workability and deteriorates corrosion resistance, so S is preferably as small as possible, and the upper limit was made 0.03%.

Ni: 8 to 16% Ni is an austenite stabilizing element, and is a main element for making stainless steel into an austenite phase, and at the same time, is an element necessary for suppressing work-induced martensite. If the content is 8% or more, an austenite single-phase structure is obtained. The higher the content, the more stable the austenite, but Ni is expensive.
The range was 16%.

Cr: 16-22% Cr is an element that contributes to improving the corrosion resistance. To obtain such an effect, it is contained in 16% or more, but if added in a large amount, ferrite will be generated, so in the range of 16-22% And

N: 0.05 to 0.35% N is added for strengthening the matrix and suppressing work-induced martensite, like C. Furthermore, it also contributes to the improvement of corrosion resistance and pitting corrosion resistance. Therefore, in order to obtain such an effect, it is set to 0.05% or more. However, if the amount is too large, bubbles are generated during melting of the steel ingot and the workability at the time of slumping is reduced, so the upper limit was made 0.35%.

Al: 0.05% or less Al is usually used as a deoxidizer, but if contained in a large amount
The upper limit was made 0.05% because it forms AlN, reduces the effective N amount, and remains as oxide inclusions to impair hot workability.

Mg: 0.001 to 0.05% Mg is a deoxidizing agent that substitutes for Al, and is effective in fixing harmful S to improve hot workability and to supplement the deterioration of workability due to N addition. However, if it is less than 0.001%, such an effect is not obtained, and if it exceeds 0.05%, the effect is saturated, so the range was made 0.001 to 0.05%.

Ca: 0.001 to 0.05% Ca is added in an amount of 0.001% or more to improve machinability and hot workability, but if it exceeds 0.05%, the effect will be saturated,
The upper limit was set to 0.05%.

Cu: 1.0 to 4.0% Cu improves corrosion resistance, lowers work hardening rate, and improves cold workability, so it is better to add Cu when high corrosion resistance and good cold workability are required. . Further, in order to obtain such an effect, it is necessary to add 1.0% or more, but if it is too much, it is an element that impairs hot workability, so the upper limit was made 4.0%.

Mo: 0.5-5.0% Mo improves the corrosion resistance and pitting corrosion similarly to Cu, so it is preferable to add Mo when there is a strong demand for corrosion resistance. Further, in order to obtain such an effect, it is necessary to add 0.5% or more, but if it is added in a large amount, ferrite is likely to be generated and it becomes expensive, so the upper limit was made 5.0%.

V: 0.03 to 0.30% V forms carbonitrides, which makes the crystal grains finer and contributes to the improvement of strength. However, if it is less than 0.03%, such an effect does not occur, and if it exceeds 0.30%, the effect is saturated and the cold workability deteriorates. Therefore, when it is added, it is necessary to set it in the range of 0.03 to 0.30%.

Ti: 0.03 to 0.30% Ti forms carbonitrides like V and contributes to strengthening the matrix by refining crystal grains. However, if less than 0.03%, there is no such effect. If it exceeds 0.30%, the effect saturates and cold workability deteriorates.
It should be in the range of ~ 0.30%.

Nb + Ta: 0.03 to 0.30% Nb, Ta forms a carbonitride similar to V, and contributes to strengthening the matrix through refinement of crystal grains. However, if it is less than 0.03%, there is no such effect, and if it is added in a large amount, nitride remains as inclusions and impairs cold workability. Therefore, when strength is particularly required, one or two of Nb and Ta should be selected. 0.30 in total
% Or more. However, the upper limit must be 0.30%, which does not impair cold workability.

The tension material for an oil ring according to the present invention is made of stainless steel having the above component composition as a raw material, and when manufacturing the tension material for an oil ring using the stainless steel having such a composition as a raw material, first, The above stainless steel is hot-rolled at a temperature of 1000 to 1200 ° C. Then, the solution is hot-rolled or subjected to solution treatment at 950 to 1150 ° C. as required, and then cold-rolled or cold-drawn by cold drawing.

When performing cold rolling as this cold working, by cold rolling, for example, after producing a cold strip steel of 0.35mmt × 300mmw, subjected to solution heat treatment at 950 ~ 1200 ℃, For example, the steel strip is slit to 2.5 mmw to form a flat wire for an oil ring.

In the case of cold wire drawing, the hot rolled material or the solution heat treated hot rolled material is subjected to cold wire drawing, for example, on a wire of 1.3 mmφ × l, and then at 950 to 1200 ° C. A solution heat treatment is performed, and for example, it is processed into 0.35 mmt × 2.5 mmw × l, and a solution heat treatment is performed at a solution temperature of 950 to 1200 ° C. to obtain a flat wire for an oil ring.

The oil wire flat wire produced in this way has a stainless steel composition in which the austenite stabilizing elements (C, Mn, Ni, Cu, N) are adjusted in a well-balanced manner. It is a stable non-magnetic steel that does not generate work-induced (pseudo) martensite even if it undergoes strong working while it is in the process of forming, and has a very good formability, with addition of C and N. Since it solid-dissolves in the matrix and strengthens the matrix, the temperature range of solution heat treatment after cold working is as wide as 950 to 1200 ° C, and even if complete solution heat treatment is performed,
The initial hardness of steel grade is the hardness required for tension materials for oil rings.
Hv180-230 can be reached very easily and consistently.

Moreover, the corrosion resistance in the corrosive environment by adding N is SUS20.
1, markedly improved compared to SUS304, and solid solution strengthened by the addition of C, N, the work hardening rate after forming and processing into the tension material for oil rings is large, and more desirably the setting treatment after forming ( (400-600 ℃), aging treatment effect can be obtained, and proof stress, tensile strength and hardness are further improved.
It is greatly improved compared to 4.

That is, more preferably, the flat wire for oil ring having the above components adjusted is subjected to cold working with a surface reduction rate of 10% or more, and then subjected to an aging treatment at 400 to 600 ° C. to obtain a proof stress and a tensile strength. Can be further improved. Therefore, in order to obtain such an aging treatment effect, for example, as a tension material (spacer) for lick vent, 0.35 mmt × 2.5
The aging treatment effect can be obtained by performing a setting treatment at 400 to 600 ° C. after forming into mmw.

This further contributes to the improvement in the tension and heat resistance of the tension material for oil rings.

At this time, the aging treatment temperature, that is, the setting temperature is 400
If the temperature is lower than 0 ° C, the proof stress and tensile strength are not so much improved by the aging treatment, and if the temperature is higher than 600 ° C, the proof stress and tensile strength are rather lowered, which is not preferable.

(Example) Table 1 shows an example of the stainless steel composition of the tension material for oil rings used in the example of the present invention and the comparative example.

First, a steel ingot having a composition shown in Table 1 manufactured by a usual melting method was slab-rolled and then hot-rolled at a temperature of 1000 to 1200 ° C., thereby forming a 5.5 mmφ wire rod. Then, when the hot workability during the hot rolling was evaluated, the results shown in Table 2 were obtained. In this evaluation of hot workability, ◯ means that it was good, and x means that the surface had cracks.

Next, an intermediate solution heat treatment is applied to the hot rolled material 1
After the wire is drawn, it is cold drawn to 1.3mmφ, and then this solution is subjected to solution heat treatment at 950-1200 ℃, then cold drawn to 0.35mmt × 2.5mmw. × l
The flat wire for oil ring was manufactured and subjected to solution heat treatment at 980 to 1150 ° C. as shown in Table 2 to manufacture a flat wire for oil ring.

When the hardness, tensile strength and elongation of this oil ring flat wire were examined, the results were as shown in Table 2.

Next, the flat wire for an oil ring is molded into a tooth-shaped uneven shape to manufacture a tension member for oil rings (expander, spacer), and the moldability at that time is evaluated. The tension, heat settling and corrosion resistance were evaluated. At this time, in the evaluation of the moldability, ◯ indicates that it was good, Δ indicates that the variation was large, and x indicates that cracks were formed after molding. In addition, in the evaluation of tension, ◯ indicates that it was good, Δ indicates that the variation was large, and x indicates that it was out of specification. Further, in the evaluation of heat settling property, ◯ indicates that the result was good, Δ indicates that the variation was large, and x indicates that it was out of the standard. Furthermore,
In the evaluation of corrosion resistance (JIS Z2371 “Salt spray test method”), ○ indicates that no rust was generated, and × indicates that rust was generated.

As shown in Table 1 and Table 2, all of the stainless steels, which are the materials for the tension material for oil rings according to the present invention, have good hot workability, and are formed when molding the tension material for oil rings. It was also confirmed that the tension of the tension material for the oil ring was good, and the tensile strength, heat settling resistance and corrosion resistance were all good.

On the other hand, the stainless steel compositions No. 11 and 12, which are the materials for the tension material for oil rings of the comparative example, had surface cracks during hot working, and were poor in manufacturability. This is N
This is because Al is contained in the o.11 steel beyond the limited range and Mg and Ca are not added, and No. 12 steel contains excessive Cu that impairs hot workability. Is. Further, Comparative Example No. 13 had a large amount of Mn and a small amount of Cr, and thus was inferior in corrosion resistance and could not withstand the salt spray test. Further, in Comparative Example No. 14, pseudo martensite was generated by the molding process, and the moldability was uneven.

Further, Comparative Example No. 15 (SUS201) had a large amount of Mn and a small amount of Cr, and thus was inferior in corrosion resistance.

Furthermore, as in Comparative Example No. 16 (SUS304), the one manufactured by adjusting the solution heat treatment temperature has a large variation in the tension and heat resistance of the tension material for the oil ring. SUS304), which has been subjected to cold working with a solution rate of 5.3% after solution heat treatment, is all as good as the steel of the present invention, but can be used in the state of solution heat treatment in the manufacturing method according to the present invention. On the other hand, Comparative Example No. 17
(SUS304) requires cold working to obtain more tension after solution heat treatment, so there is a risk of warping and lateral bending of the tension material for oil ring, and the cold working rate due to compositional variation Since the manufacturing process is complicated, and the addition of N is not required, carbide is mainly deposited in the grain boundaries during the aging treatment after forming, and it is not expected to improve the tension. Is significantly deteriorated.

On the other hand, in the case of the present invention, the aging treatment after molding (practically, the setting treatment at 400 to 600 ° C. is an essential step, so even if the aging treatment step is not added,
It is possible to process it along with the setting process.)
Since it is an N-containing stainless steel, precipitation of carbonitrides at grain boundaries does not occur, 0.2% proof stress and tensile strength increase, and aging treatment is effective as one of the strengthening methods. Is remarkable.

FIG. 1 shows the stainless steel of Inventive Example No. 1 and S of Comparative Example No. 15
FIG. 3 shows age hardening curves of cold-worked material of US201 stainless steel and No. 17 SUS304 stainless steel (area reduction ratio of 40%).

As shown in Fig. 1, No.1 stainless steel containing N and N
A marked increase in strength (0.2% proof stress and tensile strength) is observed at 400 to 600 ℃ in o.15 SUS201 stainless steel.

Next, Table 3 shows the results of applying such an aging treatment after cold working to the 40% wire drawing material of Inventive Example No. 1 having high strength and low magnetic permeability.

As shown in Table 3, a significant increase in strength was observed with aging treatment, and the 0.2% proof stress of the aged material was 120 kgf / mm ² and the tensile strength was 140 kgf / mm ² , indicating the tension of the tension material for oil rings. It is remarkably effective for the rise.

[Advantages of the Invention] As described above, the tension material for an oil ring according to the present invention is, by weight%, C: 0.01 to 0.30%, Si: 0.1 to 2.0.
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8-16%, Cr: 16-22%, N: 0.05-0.35%, Al: 0.05% or less, Mg: 0.001-0.05%, Ca: 0.001-0.05%, and Cu: 1.0-4.0% as required. , Mo: 0.5-5.0%, 1 or 2 kinds, V: 0.03-0.30%, Ti: 0.03
.About.0.30%, Nb + Ta: 0.03 to 0.30%, one or more of which is made of stainless steel having a composition consisting of balance Fe and unavoidable impurities, and a tension material for an oil ring according to the present invention. In the manufacturing method, after hot rolling the stainless steel having the above composition at a temperature of 1000 to 1200 ° C., cold working by cold rolling or cold drawing is performed, and then solution heat treatment at 950 to 1200 ° C. In case of cold rolling, cold-rolled steel is slit to the required width to make a flat wire for oil ring, and in case of cold-drawn wire, necessary cold working is applied and then solidified at 950-1200 ° C. It is subjected to solution heat treatment to make a flat wire for an oil ring, and this flat wire for an oil ring is molded into a tension material for an oil ring.
After hot rolling at a temperature of ~ 1200 ° C and solution heat treatment at 950 ~ 1150 ° C, cold working by cold rolling or cold drawing may be performed. After molding the wire into the tension material for the oil ring, 400
Since the setting treatment is performed at ~ 600 ° C. so that it also serves as the aging treatment, the tension material for an oil ring according to the present invention has a well-balanced composition of the stainless steel composition, and therefore has a high area reduction rate. No work-induced martensite is formed even when cold working is performed, therefore it is non-magnetic and has high tensile strength, and it is also excellent in corrosion resistance, formability, tensile strength and heat settling resistance. The steel having the above composition is more desirably subjected to cold working with a surface reduction rate of 10% or more and then setting treatment (aging treatment) at 400 to 600 ° C. to further improve the yield strength and tensile strength. It is possible to obtain such a great effect that it has extremely excellent properties as a tension material for oil rings.

[Brief description of drawings]

FIG. 1 shows an example of the present invention which is an austenitic stainless steel.
3 is a graph showing the age hardening behavior of No. 1, SUS201 and SUS304. The reason for limiting the composition range (% by weight) of the stainless steel used as the material will be described. C: 0.01 to 0.30% C forms a solid solution in the mother phase to strengthen the matrix, and also acts strongly as a carbonitride forming element. Moreover, it has a great effect of stabilizing austenite and suppressing the processing-induced martensite. Therefore, in order to obtain such an effect, 0.01%
That's it. However, if it exceeds 0.30%, it becomes difficult to form a solid solution, and cold workability and corrosion resistance are significantly deteriorated, so the upper limit was made 0.30%. Si: 0.1 to 2.0% Si is added as a deoxidizing agent during steel making, and is 0.1% or more to obtain such an action. However, if it exceeds 2.0%, ferrite is likely to be formed, so the upper limit was made 2.0%. Mn: 1.0 to 6.0% Mn is added as a deoxidizing and desulfurizing agent during steelmaking, and also has the effect of increasing the solubility of N and suppressing the work-induced martensite. Added more than 1.0%. However, if it exceeds 6.0%, the workability deteriorates and the corrosion resistance deteriorates, so the upper limit was made 6.0%. P: 0.03% or less Since P deteriorates corrosion resistance, it is preferable that the amount is as small as possible, and the upper limit was made 0.03%. S: 0.03% or less S impairs hot workability and deteriorates corrosion resistance, so S is preferably as small as possible, and the upper limit was made 0.03%. Ni: 8 to 16% Ni is an austenite stabilizing element, and is a main element for making stainless steel into an austenite phase, and at the same time, is an element necessary for suppressing work-induced martensite. If the content is 8% or more, an austenite single-phase structure is obtained. The higher the content, the more stable the austenite, but Ni is expensive.
The range was 16%. Cr: 16-22% Cr is an element that contributes to improving the corrosion resistance. To obtain such an effect, it is contained in 16% or more, but if added in a large amount, ferrite will be generated, so in the range of 16-22% And N: 0.05 to 0.35% N is added for strengthening the matrix and suppressing work-induced martensite, like C. Furthermore, it also contributes to the improvement of corrosion resistance and pitting corrosion resistance. Therefore, in order to obtain such an effect, it is set to 0.05% or more. However, if the amount is too large, bubbles are generated during melting of the steel ingot and the workability at the time of slumping is reduced, so the upper limit was made 0.35%. Al: 0.05% or less Al is usually used as a deoxidizer, but if contained in a large amount
The upper limit was made 0.05% because it forms AlN, reduces the effective N amount, and remains as oxide inclusions to impair hot workability. Mg: 0.001 to 0.05% Mg is a deoxidizing agent that substitutes for Al, and is effective in fixing harmful S to improve hot workability and to supplement the deterioration of workability due to N addition. However, if it is less than 0.001%, such an effect is not obtained, and if it exceeds 0.05%, the effect is saturated, so the range was made 0.001 to 0.05%. Ca: 0.001 to 0.05% Ca is added in an amount of 0.001% or more to improve machinability and hot workability, but if it exceeds 0.05%, the effect will be saturated,
The upper limit was set to 0.05%. Cu: 1.0 to 4.0% Cu improves corrosion resistance, lowers work hardening rate, and improves cold workability, so it is better to add Cu when high corrosion resistance and good cold workability are required. . Further, in order to obtain such an effect, it is necessary to add 1.0% or more, but if it is too much, it is an element that impairs hot workability, so the upper limit was made 4.0%.

Claims (6)

[Claims] 1. By weight%, C: 0.01 to 0.30%, Si: 0.1 to 2.0
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8 to 16%, Cr: 16 to 22%, N: 0.05 to 0.35%, Al: 0.05% or less, Mg: 0.001 to 0.05%, Ca: 0.001 to 0.05%, with a composition consisting of the balance Fe and unavoidable impurities Tension material for oil rings, which is made of stainless steel. 2. By weight%, C: 0.01 to 0.30%, Si: 0.1 to 2.0
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8-16%, Cr: 16-22%, N: 0.05-0.35%, Al: 0.05% or less, Mg: 0.001-0.05%, Ca: 0.001-0.05%, and Cu:
A tension material for an oil ring, which is made of stainless steel having a composition of one or two of 1.0 to 4.0% and Mo: 0.5 to 5.0%, the balance being Fe and inevitable impurities. 3. C: 0.01 to 0.30%, Si: 0.1 to 2.0 in weight%.
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8-16%, Cr: 16-22%, N: 0.05-0.35%, Al: 0.05% or less, Mg: 0.001-0.05%, Ca: 0.001-0.05%, and V: 0.
One or more of 03 to 0.30%, Ti: 0.03 to 0.30%, Nb + Ta: 0.03 to 0.30%, stainless steel having a composition consisting of balance Fe and unavoidable impurities. Tension material for oil ring. 4. By weight%, C: 0.01 to 0.30%, Si: 0.1 to 2.0
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8-16%, Cr: 16-22%, N: 0.05-0.35%, Al: 0.05% or less, Mg: 0.001-0.05%, Ca: 0.001-0.05%, and Cu:
1.0 to 4.0%, 1 or 2 of Mo: 0.5 to 5.0%, V: 0.03 to 0.30%, Ti: 0.03 to 0.30%, Nb + Ta: 0.03 to 0.
A tension material for an oil ring, which is made of stainless steel having a composition of one or more of 30%, the balance being Fe and unavoidable impurities. 5. By weight%, C: 0.01 to 0.30%, Si: 0.1 to 2.0
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8 to 16%, Cr: 16 to 22%, N: 0.05 to 0.35%, Al: 0.05% or less, Mg: 0.001 to 0.05%, Ca: 0.001 to 0.05%, with a composition consisting of the balance Fe and unavoidable impurities Stainless steel
After hot rolling at a temperature of 1000 ~ 1200 ℃, cold working by cold rolling or cold drawing, then 950 ~ 1200 ℃
Solution treatment by cold rolling, cold-rolled steel is slit to the required width to form a flat wire for oil rings, and cold-drawn is subjected to the necessary cold working.
A method for producing a tension member for an oil ring, which comprises subjecting a solid wire for an oil ring to a solution heat treatment at 950 to 1200 ° C. to form a tension member for an oil ring. 6. C: 0.01 to 0.30%, Si: 0.1 to 2.0 in weight%.
%, Mn: 1.0 to 6.0%, P: 0.03% or less, S: 0.03% or less, Ni:
8-16%, Cr: 16-22%, N: 0.05-0.35%, Al: 0.05% or less, Mg: 0.001-0.05%, Ca: 0.001-0.05%, and Cu:
1.0 to 4.0%, Mo: 0.5 to 5.0% of one or two, the balance Fe and inevitable impurities stainless steel hot-rolled at a temperature of 1000-1200 ℃, then cold rolled Or cold working by cold drawing, then 950
Perform solution heat treatment at ~ 1200 ° C, slit cold-rolled steel into the required width for cold rolling to make a flat wire for oil rings, and add cold working for cold drawing. After that, a solution heat treatment is performed at 950 to 1200 ° C. to form a flat wire for an oil ring, and the flat wire for an oil ring is molded into a tension material for an oil ring.