JP2018131670A - Ferritic free-cutting stainless wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Pb-free ferrite-based free-cutting stainless steel wire having excellent hot workability and excellent surface accuracy in cutting at low cost. SOLUTION: In mass%, C: 0.005 to 0.050%, Si: 0.10 to 1.0%, Mn: 0.10 to 0.50%, P: 0.005 to 0.05%, S: 0.25 to 0.60%, Cr: 10.5 to 19.5%, Te: 0.002 to 0.024%, Al: 0.001 to 0.010%, N: 0.005 to 0.050%, O: 0.001 to 0.020%, Ca: 0 to 0.010%, B: 0 to 0.02%, Ni: 0 to 3.0%, Mo : 0 to 3.0%, Nb: 0 to 1.00%, Ti: 0 to 1.00%, V: 0 to 0.50%, Ta: 0 to 0.5%, W: 0 to 0.5%, Co: 0 to 1.00%, Zr: 0 to 0.020%, Cu: 0 to 3.0%, Sn: 0 to 0.5%, Mg: 0 to 0.050%, REM: 0 to 0.200%, the balance consists of Fe and unavoidable impurities, and Te / S is 0.040 or less. There is a ferritic free-cutting stainless steel wire. [Selection diagram] None

Description

  The present invention relates to a ferritic free-cutting stainless steel wire.

  Among steel parts such as OA equipment and electronic equipment, parts manufactured by cutting are required to have high dimensional accuracy and good surface properties on the cut surface in addition to chip disposal at the time of cutting. As steel materials that meet these requirements, there are SUS430F with 0.15% or more of S added, or ferritic free-cutting stainless steel with Pb, Se, Te added alone or in combination to further improve machinability (Patent Literature). 1).

  On the other hand, ferritic free-cutting stainless steel in which a second phase mainly composed of Bi or Sn and Cu as a main component is dispersed has been proposed in response to market requirements for the abolition of Pb (Patent Documents 2, 3, and 4). .

Japanese Patent Laid-Open No. 10-130794 JP-A-11-140597 JP 2002-38241 A JP 2006-97039 A

  However, in the inventions of Patent Documents 1 to 4, satisfactory products are not obtained in terms of manufacturability such as hot workability and surface properties after cutting. Specifically, the above parts have excellent accuracy and surface roughness Ra ≦ 0.5 μm under industrial cutting conditions of cutting speed ≧ 20 m / min, cutting depth ≧ 0.05 mm, feed ≧ 0.005 mm / rev. However, the surface properties at that time are not disclosed in any of Patent Documents 1 to 4.

  The object of the present invention is to solve the above-mentioned problems, to obtain excellent surface accuracy with good hot workability and surface roughness (Ra): 0.5 μm or less under the cutting conditions of ordinary precision parts. An object of the present invention is to provide a ferritic free-cutting stainless steel wire containing no Pb and Se.

  As a result of various studies to solve the above problems, the present inventors have controlled the form of sulfide in a S-containing ferritic stainless steel free-cutting steel that does not contain Pb and Se by containing a small amount of Te. It was found that excellent surface accuracy can be secured. Detailed findings are as follows (a) to (d).

  (A) In order to improve the surface roughness, it is effective to reduce the constituent cutting edge formed on the cutting edge of the tool during cutting. This is because when the constituent cutting edge is generated, irregularities different from the contour of the cutting edge of the tool are generated during cutting. In the present invention, the formation of the constituent cutting edge is suppressed by reducing the aspect ratio of the sulfide in the wire.

  (B) When Te is contained, a low melting point Mn Te compound (MnTe) is formed around the sulfide, and the lubricating action causes processing after hot rolling (for example, warm drawing or cold drawing). It becomes difficult to stretch even in wire drawing. For this reason, the aspect ratio of sulfide becomes small. However, since MnTe lowers the hot ductility, the workability of the parts cannot be ensured.

  (C) On the other hand, even if a very small amount of Te that does not form MnTe is contained, the Te is dissolved in the sulfide, whereby the deformation resistance of the sulfide is increased, and as a result, the aspect ratio is reduced. .

  (D) By adjusting the contents of Mn and Cr in the wire, the composition ratio of Mn and Cr in the sulfide formed in the wire also changes, which contributes to improvement in deformation resistance.

  This invention is made | formed based on the said knowledge, The place made into the summary is as follows.

(1) In mass%,
C: 0.005 to 0.050%,
Si: 0.10 to 1.0%,
Mn: 0.10 to 0.50%,
P: 0.005 to 0.05%,
S: 0.25 to 0.60%,
Cr: 10.5 to 19.5%
Te: 0.002 to 0.024%,
Al: 0.001 to 0.010%,
N: 0.005 to 0.050%,
O: 0.001 to 0.020%,
Ca: 0 to 0.010%,
B: 0 to 0.02%,
Ni: 0 to 3.0%,
Mo: 0 to 3.0%,
Nb: 0 to 1.00%,
Ti: 0 to 1.00%,
V: 0 to 0.50%,
Ta: 0 to 0.5%
W: 0 to 0.5%
Co: 0 to 1.00%,
Zr: 0 to 0.020%,
Cu: 0 to 3.0%,
Sn: 0 to 0.5%,
Mg: 0 to 0.050%,
REM: 0 to 0.200%,
The balance consists of Fe and inevitable impurities,
A ferritic free-cutting stainless steel wire having a Te / S of 0.040 or less.

(2) A ferritic free-cutting stainless steel wire having the chemical composition,
The Mn / Cr composition ratio of Mn and Cr in the sulfide is 0.1 to 0.5, and the aspect ratio is the ratio of the diameter parallel to the rolling direction circumscribed by the sulfide and the diameter perpendicular to the rolling direction. The ferritic free-cutting stainless steel wire according to (1), wherein the sulfide has an aspect ratio of 8.0 or less.

(3) In mass%,
Ca: 0.0005 to 0.010%,
B: 0.0001 to 0.02%,
Ni: 0.1 to 3.0%,
Mo: 0.1 to 3.0%,
Nb: 0.05-1.00%
Ti: 0.05-1.00%,
V: 0.05 to 0.50%,
Ta: 0.1 to 0.5%
W: 0.1-0.5%
Co: 0.05 to 1.00%
Zr: 0.001 to 0.020%,
Cu: 0.1 to 3.0%,
Sn: 0.03-0.5%,
Mg: 0.0005 to 0.050%,
REM: 0.0005 to 0.200%,
The ferritic free-cutting stainless steel wire according to (1) or (2), which contains one or more selected from:

  In the present invention, the hot-workability is good without containing Pb and Se, which adversely affect the environment, and the surface roughness (Ra ): A ferritic free-cutting stainless steel wire having excellent surface accuracy of 0.5 μm or less can be obtained.

  Below, each requirement of this invention is demonstrated.

1. Chemical composition The reasons for limiting each element are as follows. In the following description, “%” for chemical composition means “mass%”.

C: 0.005 to 0.050%
C is necessary for producing carbide and obtaining strength. For this reason, the C content is preferably 0.005% or more, and the C content is preferably 0.010% or more. On the other hand, excessive carbide accelerates the generation of the constituent cutting edge during cutting and degrades the cutting surface accuracy. Therefore, the C content is 0.050% or less, and the C content is 0.030% or less. Is preferred.

Si: 0.10 to 1.0%
Si is used for deoxidation. For this reason, the Si content is preferably 0.10% or more, and the Si content is preferably 0.30% or more. On the other hand, when it contains more than 1.0%, the scale production | generation at the time of bar wire hot rolling is suppressed, and the production | generation of a hot rolling mill is promoted. Therefore, the Si content is 1.0% or less.

Mn: 0.10 to 0.50%
Mn is an element that generates sulfide together with Cr and improves machinability, particularly cutting surface accuracy. For this reason, Mn content shall be 0.10% or more. On the other hand, if the Mn content exceeds 0.50%, Mn / Cr in the sulfide increases, the sulfide expands, and the aspect ratio increases. Therefore, the Mn content is preferably 0.50% or less, and the Mn content is preferably 0.40% or less.

P: 0.005 to 0.05%
P segregates at the grain boundaries to lower the material ductility during the cutting process and improve the surface accuracy. For this reason, the P content is preferably 0.005% or more, and the P content is preferably 0.01% or more. However, if the content exceeds 0.05%, the effect is not only saturated, but the productivity is significantly deteriorated. Therefore, the P content is 0.05% or less.

S: 0.25 to 0.60%
S forms sulfides, and stress concentrates on the sulfides during cutting. A crack is generated starting from sulfide in the shear deformation region at the time of chip generation, and the growth of the constituent cutting edge is suppressed. For this reason, the cutting surface precision of a wire improves. In order to obtain this effect, the S content is preferably 0.25% or more, and the S content is preferably 0.28% or more. On the other hand, when it contains exceeding 0.60%, hot workability will deteriorate remarkably. Therefore, the S content is preferably 0.60% or less, and the S content is preferably 0.55% or less.

Cr: 10.5 to 19.5%
Cr forms a sulfide together with Mn. Particularly, by optimizing the composition ratio (Mn / Cr) of Mn and Cr in the sulfide, the aspect ratio of the sulfide can be reduced. In order to reduce the aspect ratio and improve the cutting surface accuracy, the Cr content is 10.5% or more, and the Cr content is preferably 15.0% or more, and 16.0% or more. More preferably. However, if it is contained in a large amount, Mn / Cr in the sulfide becomes too small, and on the contrary, the sulfide is easily spread and the aspect ratio is increased. Therefore, the Cr content is preferably 19.5% or less, and the Cr content is preferably 18.5% or less.

Te: 0.002 to 0.024%
Te is an important element in the present invention for improving machinability, particularly the accuracy of the cut surface. Te suppresses deformation by solid solution in sulfide and reduces the aspect ratio. As a result, the growth of the constituent cutting edges is suppressed and the cutting surface accuracy is improved. For this reason, the Te content is preferably 0.002% or more, and the Te content is preferably 0.003% or more. On the other hand, when Te is contained in excess of 0.024%, not only the effect is saturated, but also the productivity is significantly deteriorated due to the formation of MnTe around the sulfide. Therefore, the Te content is set to 0.024% or less, and the Te content is preferably 0.015% or less, and more preferably 0.010% or less.

Al: 0.001 to 0.010%
Al is used as a deoxidizing element. Therefore, the Al content is set to 0.001% or more. On the other hand, if the content exceeds 0.010%, a hard Al-based oxide is formed, the machinability is deteriorated, and the tool life is shortened. Therefore, the Al content is preferably 0.010% or less, and the Al content is preferably 0.008% or less.

N: 0.005 to 0.050%
N increases the ferrite strength of the matrix. For this reason, the N content is preferably 0.005% or more, and the N content is preferably 0.008% or more. However, when the N content exceeds 0.050%, the tool life is deteriorated due to an excessive increase in strength. Therefore, the N content is preferably 0.050% or less, and the N content is preferably 0.030% or less.

  Furthermore, the present invention may contain the selective elements described below.

O: 0.001 to 0.020%
O improves machinability by coarsening the deoxidation product during solidification. For this reason, the O content is 0.001% or more, and the O content is preferably 0.003% or more, and more preferably 0.005% or more. However, if the content exceeds 0.020%, hard inclusions increase and the machinability deteriorates. Therefore, the O content is 0.020% or less.

Ca: 0 to 0.010%
Ca has an effect of softening oxide inclusions, improving machinability, and improving the tool life, so Ca may be contained. However, if it exceeds 0.010%, the effect is saturated and hot workability is reduced. For this reason, the Ca content is preferably 0.010% or less, and the Ca content is preferably 0.008% or less. On the other hand, in order to acquire the said effect, it is preferable that Ca content is 0.0005% or more, and 0.0010% or more is more preferable. Further, the Ca content is most preferably 0.003% or more.

B: 0 to 0.02%
B is an element used for improving hot workability, and may be contained in order to obtain a stable effect. However, if excessively contained, the B compound precipitates and deteriorates the hot workability, so the B content is preferably 0.02% or less, and the B content is preferably 0.015% or less. . On the other hand, in order to acquire the said effect, it is preferable that B content is 0.0001% or more, and it is more preferable that B content is 0.0002% or more.

Ni: 0 to 3.0%
Ni may be contained in order to increase the hardness of the material by solid solution strengthening to prevent the formation of the constituent cutting edge and improve the surface accuracy during cutting. However, even if the content exceeds 3.0%, the effect is saturated, and the wire is excessively hardened to cause tool life deterioration. Therefore, the Ni content is preferably 3.0% or less, and the Ni content is preferably 1.5% or less. On the other hand, in order to acquire the said effect, it is preferable that Ni content is 0.1% or more, and it is more preferable that Ni content is 0.15% or more.

Mo: 0 to 3.0%
Mo is an element that improves the corrosion resistance, and may be contained. However, when Mo is contained in a large amount, the toughness is lowered. For this reason, the Mo content is preferably 3.0% or less, and the Mo content is preferably 2.0% or less. On the other hand, in order to acquire the said effect, it is preferable that Mo content is 0.1% or more.

Nb: 0 to 1.00%
Ti: 0 to 1.00%
V: 0 to 0.50%
Ta: 0 to 0.5%
W: 0 to 0.5%
Nb, Ti, V, Ta, and W may form carbonitride and have an effect of improving corrosion resistance, and thus may be contained. However, since a machinability deteriorates machinability, the Nb content is 1.00% or less and the Ti content is 1.00% or less. Further, the V content is 0.50% or less, the Ta content is 0.5% or less, and the W content is 0.5% or less. On the other hand, in order to obtain the above effect, the Nb content is preferably 0.05% or more, the Ti content is preferably 0.05% or more, and the V content is 0.00%. It is preferably at least 05%. The Ta content is preferably 0.1% or more, and the W content is preferably 0.1% or more.

Co: 0 to 1.00%
Co may be contained in order to increase the toughness of the matrix. However, if it is excessively contained, a martensite structure is precipitated and the machinability is deteriorated. Therefore, the Co content is preferably 1.00% or less, and the Co content is preferably 0.60% or less. On the other hand, in order to acquire the said effect, it is preferable that Co content is 0.05% or more.

Zr: 0 to 0.020%
Zr has the effect of improving the strength and may be contained. However, since a large content reduces toughness, the Zr content is set to 0.020% or less. On the other hand, in order to sufficiently obtain the strength effect, the Zr content is preferably 0.001% or more.

Cu: 0 to 3.0%
Cu may be contained in order to increase the hardness of the material by solid solution strengthening to prevent the formation of the constituent cutting edge and to improve the surface accuracy during the cutting process. However, even if the content exceeds 3.0%, the effect is saturated and manufacturability deteriorates such as occurrence of cracks in the slab, so the Cu content is 3.0% or less. On the other hand, in order to acquire the said effect, it is preferable that Cu content is 0.1% or more.

Sn: 0 to 0.5%
Sn may be contained in order to suppress deterioration of corrosion resistance by coexisting with a sulfide that deteriorates corrosion resistance. However, if the content exceeds 0.5%, the manufacturability is deteriorated. Therefore, the Sn content is preferably 0.5% or less, and the Sn content is preferably 0.3% or less. On the other hand, in order to acquire the said effect, it is preferable that Sn content is 0.03% or more, and it is preferable that Sn content is 0.05% or more.

Mg: 0 to 0.050%
Mg may be contained in order to improve hot workability. However, if the content exceeds 0.050%, hot workability is deteriorated on the contrary, so the Mg content is 0.050% or less. On the other hand, in order to acquire the said effect, it is preferable that Mg content is 0.0005% or more.

REM: 0 to 0.200%
REM is an element effective for preventing deterioration of hot workability, and may be contained. However, if the content exceeds 0.200%, the hot workability is deteriorated. Therefore, the REM content is set to 0.200% or less. On the other hand, in order to acquire the said effect, it is preferable that REM content is 0.0005% or more.

  REM (rare earth element) refers to a generic name of two elements of scandium (Sc) and yttrium (Y) and 15 elements (lanthanoid) from lanthanum (La) to lutetium (Lu) according to a general definition. You may make it contain independently and a mixture may be sufficient.

  The wire rod of the present invention comprises Fe and unavoidable impurities other than the above-described elements. However, elements other than those described above may be included as long as the effects of the present invention are not impaired. Pb and Se may be inevitably mixed, but it is necessary to control Pb to be less than 0.03% and Se to be less than 0.02%.

  Inevitable impurities are mixed from ore as a raw material, scrap, or production environment when industrially producing steel materials, and are allowed within a range that does not adversely affect the steel materials of the present invention. Means things.

2. Te / S
When Mn / Cr in the sulfide described later is in the range of 0.1 to 0.5, and further when the Te / S of the steel material is small, the sulfide is maintained while maintaining the manufacturability (hot workability). Can be effectively spheroidized and the aspect ratio can be reduced to 8.0 or less. In order to obtain such an effect, Te / S, which is the composition ratio of Te and S, is set to 0.040 or less. Te / S is preferably less than 0.040, and more preferably 0.030 or less.

3. Mn / Cr in sulfide
Since S-containing ferritic free-cutting stainless steel wire generally has a total area reduction of 95% or more from casting to final rolling, the MnS-based sulfide extends in the longitudinal direction of the wire. The expanded MnS-based sulfide causes a reduction in surface accuracy when it is cut. Therefore, in the present invention, Cr is solid-solved in the sulfide, and Mn / Cr in the sulfide is made 0.5 or less to suppress sulfide deformation during rolling and keep the aspect ratio small. The Mn / Cr in the sulfide is preferably 0.4 or less. On the other hand, excessive solid solution increases the deformability, so Mn / Cr in the sulfide is 0.1 or more and preferably 0.2 or more.

4). Aspect ratio of sulfide In the ferritic free-cutting stainless steel wire containing S, the MnS sulfide expands in the longitudinal direction of the wire, and therefore the aspect ratio becomes larger than that of a normal steel plate. However, if the value of the aspect ratio of the sulfide becomes too large, it will cause a reduction in surface accuracy when cutting. For this reason, the aspect ratio of the sulfide is set to 8.0 or less. Moreover, in order to reduce processing roughness stably, it is preferable that an aspect ratio shall be 5.0 or less. Here, the aspect ratio is a ratio of a diameter parallel to the rolling direction circumscribing the sulfide, that is, a horizontal ferret diameter, to a diameter perpendicular to the rolling direction, that is, a vertical ferret diameter. It is expressed as diameter / vertical ferret diameter

5. Manufacturing conditions The manufacturing process of the wire rod according to the present invention includes, for example, a process of (1) steelmaking → (2) hot rolling → (3) processing to wire (drawing, cutting, etc.) → (4) annealing. If necessary, hot forging may be performed after the steel making process. In steelmaking, steel containing the essential elements and / or selective elements of the present invention is melted and refined, and the molten steel is made into a slab by continuous casting. Thereafter, the slab is hot-rolled. A preferable condition in this case is to perform hot rolling at a finish rolling temperature of 900 ° C. or higher. Subsequently, wire drawing and cutting are performed. The preferable conditions in this case are from room temperature to about 100 ° C. Finally, an annealing process is performed.

  The annealing condition after the wire rolling is not particularly specified, but it is desirable to set it to 650 to 850 ° C. or less in order to obtain a hardness of 140 Hv or more. Moreover, although it is necessary to ensure sufficient also about annealing time, when it exceeds 300 minutes, 140 Hv or more will no longer be obtained. Also from the point of homogenization of the structure, the annealing time is preferably 2 to 300 minutes. More preferably, it is 5 to 120 minutes.

  The wire rod is steel rolled into a rod shape, and the cross section is a circle, an ellipse, a square, a rectangle, a hexagon, or the like, and refers to a steel material wound in a coil shape.

  Tables 1 and 2 show the chemical compositions of the steels of the examples.

  Steels having these chemical compositions were melted in a 150 kg vacuum melting furnace, cast into a slab having a diameter of 200 mm, and then forged to a diameter of 70 mm by heating at 1200 ° C. Subsequently, after peeling to a diameter of 66 mm, it was processed to a diameter of 18 mm by hot extrusion corresponding to steel bar rolling, and annealed at 780 ° C. for 1 hour. Finally, a wire having a diameter of 15 mm was finished by machining, and each evaluation test was performed as a material for evaluation.

  The wire is embedded in a resin so as to observe a cross section in the longitudinal direction including the center line, mirror-polished, and the sulfide composition is analyzed with an EDS analyzer attached to a scanning electron microscope (SEM). Mn / Cr in the sulfide was calculated.

  The aspect ratio of the sulfide was the same sample as that used for SEM-EDS, and was observed with an optical microscope at 10 magnifications at 10 magnifications. The diameter parallel to the rolling direction circumscribing all sulfides (horizontal Ferret diameter) and a diameter perpendicular to the rolling direction (vertical ferret diameter) were measured by an image analysis method. The horizontal ferret diameter / vertical ferret diameter of each sulfide was calculated as an aspect ratio, and the average value of the aspect ratios of all sulfides was taken as the aspect ratio of the sample.

  Manufacturability, that is, hot ductility was evaluated by a high temperature tensile test. Specifically, a hot ductility evaluation test piece having a diameter of 10 mm is collected in the longitudinal direction of the round bar from the center between the forged material having a diameter of 70 mm and the surface, and the test temperature is 1000 ° C. and the strain rate is 0.001 /. Evaluation was made by the drawing value after the tensile fracture under the condition of s. The shape of the test piece at this time was based on a No. 2 test piece described in JIS Z 2241 and was a test piece of φ10 mm × 100 mm. For evaluation of hot ductility, a Gleeble test machine manufactured by Dynamic system, which is an evaluation device that heats a test piece by energization and can be pulled and broken at a predetermined temperature, is used.

  The Vickers hardness was measured by micro-Vickers (load 1 kgf) for a surface layer of 1 mm with a mirror-polished cross section of the material. The hardness of the steel of the present invention was 140 Hv or more.

The surface roughness after the outer periphery cutting of the wire was evaluated by the center line average roughness (Ra) of the cutting surface.
Cutting is a turning process, using a tool of carbide P type and cutting edge R of 0.4 mm, cutting speed 50 m / min, feed rate 0.02 mm / rev, cutting depth 0.1 mm, cutting oil (mineral oil) It was performed under the conditions of application.

The surface roughness Ra was measured on the sample after 15-minute turning. For the measurement, a contact-type roughness measuring machine was used, and the average length was measured at 5 points each with a reference length of 2.5 mm.
In the present invention, it was judged that the surface roughness Ra was good when it was 0.5 μm or less.

  The tool life was evaluated by the time until the average wear amount of the flank surface reached 0.2 mm, and if it was less than 0.2 mm after 15 minutes of machining, the life was achieved. The hot ductility (drawing value at 1000 ° C.), which is an index of manufacturability, was good at 70% or more.

  The results are summarized in Table 3.

  Invention Example No. 1 to No. In No. 49, the composition of the components and sulfides also satisfy the prescribed ranges, and desired characteristics are obtained in all of good surface roughness, tool life, and hot workability. On the other hand, No. of comparative steel. 50 to No. It can be seen that 78 does not satisfy the specified range and does not satisfy any of the characteristics.

As is clear from the examples, according to the present invention, an inexpensive ferritic free cutting excellent in hot workability, surface accuracy after cutting, and tool life without containing a highly toxic heavy metal such as Pb. Stainless steel rods can be manufactured.

Claims (3)

% By mass
C: 0.005 to 0.050%,
Si: 0.10 to 1.0%,
Mn: 0.10 to 0.50%,
P: 0.005 to 0.05%,
S: 0.25 to 0.60%,
Cr: 10.5 to 19.5%
Te: 0.002 to 0.024%,
Al: 0.001 to 0.010%,
N: 0.005 to 0.050%,
O: 0.001 to 0.020%,
Ca: 0 to 0.010%,
B: 0 to 0.02%,
Ni: 0 to 3.0%,
Mo: 0 to 3.0%,
Nb: 0 to 1.00%,
Ti: 0 to 1.00%,
V: 0 to 0.50%,
Ta: 0 to 0.5%
W: 0 to 0.5%
Co: 0 to 1.00%,
Zr: 0 to 0.020%,
Cu: 0 to 3.0%,
Sn: 0 to 0.5%,
Mg: 0 to 0.050%,
REM: 0 to 0.200%,
The balance consists of Fe and inevitable impurities,
A ferritic free-cutting stainless steel wire having a Te / S of 0.040 or less. A ferritic free-cutting stainless steel wire having the chemical composition,
Mn / Cr which is the composition ratio of Mn and Cr in the sulfide is 0.1 to 0.5,
The ferrite-based free-cutting according to claim 1, wherein the aspect ratio of the sulfide is 8.0 or less when the ratio of the diameter parallel to the rolling direction circumscribed by the sulfide and the diameter perpendicular to the rolling direction is defined as the aspect ratio. Stainless wire. In mass%,
Ca: 0.0005 to 0.010%,
B: 0.0001 to 0.02%,
Ni: 0.1 to 3.0%,
Mo: 0.1 to 3.0%,
Nb: 0.05-1.00%
Ti: 0.05-1.00%,
V: 0.05 to 0.50%,
Ta: 0.1 to 0.5%
W: 0.1-0.5%
Co: 0.05 to 1.00%
Zr: 0.001 to 0.020%,
Cu: 0.1 to 3.0%,
Sn: 0.03-0.5%,
Mg: 0.0005 to 0.050%,
REM: 0.0005 to 0.200%,
The ferritic free-cutting stainless steel wire according to claim 1 or 2, comprising at least one selected from the group consisting of