JP2010242221A - Heat-resistant steel member and method for production thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-resistant steel member which has a ring form, hardly causes anisotropy, shows uniform mechanical properties in various places, and further can be easily produced, and also to provide a method for production thereof. <P>SOLUTION: The heat-resistant steel member comprises, by weight, 0.06-0.18% C, 0.05-0.6% Si, 0.2-0.8% Mn, 9-11.5% Cr, 0.1-1% Ni, 0.8-1.3% Mo, 0.05-0.5% Nb, 0.07-0.3% V, 0.03-0.08% N and the balance Fe with inevitable impurities, and is formed in a ring shape by a centrifugal casting method. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a ring-shaped heat-resistant steel member formed using heat-resistant steel and a method for producing the same.

  Conventionally, a turbine nozzle having a diaphragm structure in a steam turbine has a structure in which both ends of a nozzle plate arranged in an annular row are fixed without welding between a diaphragm outer ring and a diaphragm inner ring divided into two annular bodies. (For example, refer to Patent Document 1).

  Further, the nozzle plate is generally formed by cutting, for example, square material. In the production of this nozzle plate, the nozzle plate is subjected to strict manufacturing standards in accordance with the shape of the fixed portion of the nozzle plate in the diaphragm outer ring and the diaphragm inner ring, and the curvature of the inner surface of the diaphragm outer ring and the outer surface of the diaphragm inner ring. Manufacturing required a lot of manufacturing processes and manufacturing time.

US Pat. No. 5,743,711

  As described above, when manufacturing a turbine nozzle having a conventional diaphragm structure, the nozzle plate must be accurately fixed between the diaphragm outer ring and the diaphragm inner ring, and the structure of each component becomes complicated. Furthermore, skilled techniques were required for assembly. In addition, since the nozzle plate is manufactured under strict manufacturing standards, it is difficult to improve the manufacturing efficiency. Further, since the nozzle plate is manufactured by cutting from a square or the like, it is difficult to improve the economy. In addition, it is desirable that a member for manufacturing a nozzle plate or the like has no mechanical anisotropy and has uniform mechanical properties.

  Therefore, in the present invention, a ring-shaped member can be equally divided into a predetermined number and cut to produce, for example, a divided structure integrally including a diaphragm outer ring, a diaphragm inner ring, and a nozzle plate. Even when manufactured as a ring-shaped member, anisotropy hardly occurs, homogeneous mechanical properties can be obtained in various places, and a heat-resistant steel member that can be easily manufactured and a method for manufacturing the same The purpose is to provide.

  In order to achieve the above object, the heat-resistant steel member of the present invention is C: 0.06-0.18%, Si: 0.05-0.6%, Mn: 0.2-0. 8%, Cr: 9 to 11.5%, Ni: 0.1 to 1%, Mo: 0.8 to 1.3%, Nb: 0.05 to 0.5%, V: 0.07 to 0 .3%, N: 0.03 to 0.08%, the balance is made of Fe and inevitable impurities, and is formed into a ring shape by centrifugal casting.

  According to this heat-resistant steel member, it is possible to provide a heat-resistant steel member molded in a ring shape that hardly generates anisotropy and can obtain uniform mechanical properties in various places.

  A method for producing a heat-resistant steel member according to the present invention is a method for producing a heat-resistant steel member having the above-described composition components, wherein a melting step for melting the composition components constituting the heat-resistant steel member, and the melted molten metal A centrifugal casting process for pouring into a rotating mold having a predetermined shape to form a ring-shaped casting, and a heat treatment process for performing a heat treatment for quenching and tempering the casting.

  According to this method for producing a heat-resistant steel member, it is possible to easily produce a heat-resistant steel member having almost no anisotropy and uniform mechanical properties in various places.

  According to the heat-resistant steel member and the manufacturing method thereof of the present invention, it has a ring shape, hardly generates anisotropy, can obtain uniform mechanical properties in various places, and can be easily manufactured. .

It is a top view of the ring-shaped heat-resistant steel member for nozzle plates of one embodiment of the present invention. It is a top view of a nozzle plate. It is a top view of a nozzle plate.

  As a means for solving the problems in the conventional turbine nozzle manufacturing described above, the present inventors have considered to manufacture the diaphragm outer ring, the diaphragm inner ring, and the nozzle plate integrally. Furthermore, it was considered to divide a ring-shaped member into a predetermined number and cut it to produce a divided structure integrally including a diaphragm outer ring, a diaphragm inner ring, and a nozzle plate. Therefore, the inventors have excellent characteristics in manufacturing this divided structure, heat-resistant that can be easily formed into a desired shape, and can exhibit good quality and economy. As a result of research on the steel member and its manufacturing method, the present invention has been achieved.

  Hereinafter, an embodiment of the present invention will be described.

  The heat-resistant steel member of the present invention is made of heat-resistant steel having a compositional component range shown below, and is formed into a ring shape by centrifugal casting. In the following description, “%” representing a composition component is “% by weight” unless otherwise specified.

(M1) C: 0.15 to 0.25%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 9 to 11.5%, Ni: 0.1 -1%, Mo: 0.8-1.3%, Nb: 0.05-0.5%, V: 0.07-0.3%, N: 0.03-0.08% And heat-resisting steel with the balance being Fe and inevitable impurities.
(M2) C: 0.06-0.18%, Si: 0.05-0.6%, Mn: 0.2-0.8%, Cr: 11.25-13%, Ni: 0.1 Heat resistant steel containing ˜1%, the balance being Fe and inevitable impurities.
(M3) C: 0.06-0.18%, Si: 0.05-0.6%, Mn: 0.2-0.8%, Cr: 13-14%, Ni: 0.1-1 %, Nb: 0.2 to 0.5%, N: 0.03 to 0.08%, and the balance is Fe and unavoidable impurities.
(M4) C: 0.06 to 0.18%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 11.5 to 13.5%, Ni: 0 .1% to 1% heat-resisting steel with the balance being Fe and inevitable impurities.
(M5) C: 0.15 to 0.25%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 9 to 12.5%, Ni: 0.1 Containing 1 to 1%, Mo: 0.8 to 1.3%, V: 0.07 to 0.3%, W: 0.8 to 1.3%, the balance being Fe and inevitable impurities steel.
(M6) C: 0.06 to 0.18%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 11.5 to 12.5%, Ni: 0 0.1 to 1%, Nb: 0.05 to 0.5%, V: 0.07 to 0.3%, N: 0.03 to 0.08%, and the balance from Fe and inevitable impurities Heat resistant steel.
(M7) C: 0.06 to 0.18%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 9 to 11.5%, Ni: 0.1 -1%, Mo: 0.8-1.3%, Nb: 0.05-0.5%, V: 0.07-0.3%, N: 0.03-0.08% And heat-resisting steel with the balance being Fe and inevitable impurities.
(M8) C: 0.06 to 0.18%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 9 to 11.5%, Ni: 0.1 -1%, Mo: 0.8-1.3%, Nb: 0.05-0.5%, V: 0.07-0.3%, N: 0.03-0.08%, W: A heat resistant steel containing 0.8 to 1.3%, the balance being Fe and inevitable impurities.

  Here, in the inevitable impurities in the heat resistant steels (M1) to (M8) described above, among the inevitable impurities, P is 0.03% or less, S is 0.03% or less, and Co is 0.25%. Hereinafter, it is preferable to suppress Al to 0.05% or less, Ti to 0.05% or less, Sn to 0.04% or less, and Cu to 0.25% or less.

  According to the heat-resisting steel member according to the present invention, which is composed of the heat-resisting steel having the compositional component range described above and formed into a ring shape by centrifugal casting, has almost no anisotropy and has desired mechanical properties. Its mechanical properties in can be made almost homogeneous. Moreover, a desired shape can be easily formed, and excellent quality and economy can be exhibited.

  Next, the reason for limitation of each composition component range in the heat-resistant steel member according to the present invention will be described.

(1) C (carbon)
C is indispensable as a constituent element of the carbide contributing to precipitation strengthening while ensuring hardenability. In the heat resistant steels (M1) and (M5) described above, if the content is less than 0.15%, the above effect is small, and if it exceeds 0.25%, the agglomeration and coarsening of carbides in a high temperature environment are promoted Thus, the precipitation strengthening ability is reduced. Therefore, in the heat resistant steels (M1) and (M5), the C content is set to 0.15 to 0.25%.

  Moreover, in the heat-resistant steels (M2) to (M4) and (M6) to (M8) described above, since welding may be performed individually after cutting, welding may be performed even at the expense of hardenability and strength characteristics. It is practically preferable to suppress the property and hardening of the weld. Therefore, it is necessary to reduce the C content. In the heat-resistant steels (M2) to (M4) and (M6) to (M8), the C content is set to 0.06 to 0.18%. .

(2) Si (silicon)
Si is useful as a deoxidizer and also improves steam oxidation resistance. Moreover, it also has the effect | action which improves the fluidity | liquidity of the molten metal at the time of casting. However, when the content is high, a decrease in toughness and aging embrittlement are promoted. From this viewpoint, the content is desirably suppressed as much as possible. In the heat-resisting steel according to the present invention, when the content is less than 0.05%, the above-described effect cannot be exhibited, and when it exceeds 0.6%, the above-described effect is remarkably reduced. Therefore, the Si content is determined to be 0.05 to 0.6%. Moreover, the more preferable content rate of Si is 0.05 to 0.3%.

(3) Mn (manganese)
Mn is an element useful as a desulfurizing agent. From this viewpoint, addition of 0.2% or more is necessary. On the other hand, when the content increases, the amount of sulfide generated increases and the creep strength is lowered. Therefore, the upper limit of the Mn content is set to 0.8%, and the Mn content is set to 0.2 to 0.8%. did. Moreover, the more suitable content rate of Mn is 0.3 to 0.6%.

(4) Cr (chrome)
Cr is effective for oxidation resistance and corrosion resistance, and is also an indispensable element as a constituent element of carbonitride that contributes to precipitation strengthening. When the content is less than 9%, these effects are not recognized. On the other hand, if it exceeds 14%, the amount of ferrite produced increases depending on the balance with the amount of other additive elements, and the high temperature strength and toughness are lowered. Further, for each of the heat resistant steels (M1) to (M8) described above, the balance with the amount of other additive elements is different, and the desired mechanical properties are also different. Considering these, the Cr content is determined to be 9 to 14%. Moreover, the more suitable content rate of Cr is 10 to 13.5%, and it is preferable to change a restriction | limiting range for every heat resistant steel in this range.

(5) Mo (molybdenum)
Mo becomes a constituent element of solid solution strengthening and carbonitride and contributes to precipitation strengthening, and also contributes to improvement of hardenability. In the heat-resisting steel according to the present invention, about the heat-resisting steel to which Mo is intentionally added, the above effect is exhibited by addition of 0.8% or more. In particular, the tendency of component segregation during casting increases. Therefore, the Mo content is determined to be 0.8 to 1.3%. Moreover, the more preferable content rate of Mo is 0.9 to 1.1%. For the heat-resistant steels (M2) and (M6) described above, 0.2% or less is allowed only when mixed from raw materials as inevitable impurities, and the residual content can be as close to 0% as possible. desirable.

(6) Ni (nickel)
Ni contributes to the improvement of hardenability and toughness. In the heat-resistant steel to which Ni is added, the above effect is exhibited by addition of 0.1% or more. However, if it exceeds 1%, the creep strength decreases, so the Ni content is 0.1-1%. did. Moreover, the more preferable content rate of Ni is 0.1 to 0.6%.

(7) Nb (Niobium)
Nb contributes to the formation of fine carbonitrides. For heat-resistant steel to which Nb is added, addition of 0.05% or more sufficiently precipitates fine precipitates and suppresses the recovery of the parent phase. The amount of nitride produced is significant and the toughness is reduced. Furthermore, considering the balance with the addition amount of C or N, the Nb content was set to 0.05 to 0.5%. In the heat resistant steels (M1) and (M3) described above, a more preferable content of Nb is 0.35 to 0.45%. In the heat resistant steels (M6) to (M8), Nb A more preferred content is 0.07 to 0.1%.

(8) V (Vanadium)
V contributes to solid solution strengthening and formation of fine carbonitrides. With respect to heat-resistant steel to which V is added, addition of 0.07% or more sufficiently precipitates fine precipitates and suppresses the recovery of the parent phase. However, if it exceeds 0.3%, the toughness is reduced. Furthermore, considering the balance with the amount of other elements to be added and desired mechanical properties, the V content is determined to be 0.07 to 0.3%. In the heat resistant steels (M1), (M5), (M7) and (M8) described above, the more preferable content of V is 0.15 to 0.25%, and the heat resistant steel of (M6) In V, a more preferable content of V is 0.07 to 0.1%.

(9) W (tungsten)
W becomes a constituent element of solid solution strengthening and carbonitride, and contributes to precipitation strengthening. With regard to heat-resistant steel to which W is added, the above effect is exhibited by addition of 0.8% or more. However, when it exceeds 1.3%, toughness is reduced and the tendency of component segregation during casting is increased. . Therefore, the W content is set to 0.8 to 1.3%. Moreover, the more preferable content rate of W is 0.9 to 1.1%. In addition, it is desirable that the heat resistant steel of (M1) described above is allowed to be 0.25% or less only when mixed from the raw material as an inevitable impurity, and its residual content is as close to 0% as possible.

(10) N (nitrogen)
N contributes to the formation of fine nitrides. For heat-resisting steels to which N is added, addition of 0.03% or more sufficiently precipitates fine precipitates and suppresses the recovery of the parent phase, but if it exceeds 0.08%, the amount of coarse nitrides produced Increases, and agglomeration and coarsening of precipitates proceed at a high temperature. Further, considering the balance with the added amount of C, V or Nb, the Nb content was set to 0.03 to 0.08%. Moreover, the more suitable content rate of N is 0.04 to 0.07%.

(11) P (phosphorus), S (sulfur), Co (cobalt), Al (aluminum), Ti (titanium), Sn (tin) and Cu (copper)
P, S, Co, Al, Ti, Sn, and Cu are classified as inevitable impurities in the heat-resistant steel according to the present invention, and these promote toughness reduction and embrittlement during operation due to heating. . Therefore, it is desirable to make the residual content as close to 0% as possible. Further, the residual content of individual elements is such that P is 0.03% or less, preferably 0.02% or less, S is 0.03% or less, preferably 0.015% or less, and Co is 0.25% or less. Al and Ti are 0.05% or less, preferably 0.02% or less, Sn is 0.05% or less, preferably 0.04% or less, and Cu is 0.25% or less.

(Method for manufacturing heat-resistant steel)
Next, the manufacturing method of the above heat-resistant steel member will be described.

  First, the composition components constituting any of the heat resistant steels (M1) to (M8) described above are dissolved in the atmosphere (dissolution step).

  Subsequently, in the atmosphere, the molten metal is poured into a rotating ring-shaped mold of a centrifugal casting apparatus to form a ring-shaped casting (centrifugal casting process). The cooling at this time is performed by natural cooling.

  Subsequently, the ring-shaped casting is subjected to heat treatment for quenching and tempering (heat treatment step). In addition, the conditions of the heat processing of quenching and tempering for exhibiting a mechanical characteristic suitable for each material differ for each heat-resistant steel.

  Here, the ring shape means a shape such as a cylinder with both ends opened, a disk with an opening at the center, etc. In the cylinder or disk, the outer diameter or the inner diameter is increased in the central axis direction, Includes reduced shapes.

  Next, the reason why the heat-resistant steel member according to the present invention is preferably formed into a ring shape will be described.

  Small parts such as steam turbine blades, nozzle plates, valve built-in parts, and heat exchangers are usually machined by squares formed by forging or rolling, or members formed by forging, which are relatively close to the final shape. Finish by cutting by machining. Among these, for example, the blades and the nozzle plate are incorporated on a certain circumference having a curvature such as a turbine rotor and a nozzle diaphragm, so that high dimensional accuracy is required.

  However, parts cut out from square bars and individually forged parts are inevitably subject to dimensional variations from one individual to another, and the dimensional accuracy when assembled on the circumference is low. There is a case where correction processing is performed. In addition, small parts such as internal valve products and heat exchangers are often processed into a ring shape or a cylindrical shape as a final shape. Therefore, from the viewpoint of the yield by cutting and the number of manufacturing steps, it is possible to further rationalize the part manufacturing process by manufacturing the member itself in a ring shape.

  That is, in a member manufactured as a ring shape, it is possible to adjust the dimensions by cutting a portion having the curvature of the inner and outer rings or the side surface while maintaining the ring shape. Also, by cutting the ring after processing and finishing each individual part, the number of processing steps can be greatly reduced, and the yield can be improved. Furthermore, it becomes possible to improve the dimensional accuracy of the individual to each stage.

  For these reasons, it is preferable that the heat-resistant steel member according to the present invention, which can be used as a member of a steam turbine blade, a nozzle plate, or the like, is formed into a ring shape.

  Next, the reason why the ring-shaped heat-resistant steel member according to the present invention is preferably formed by centrifugal casting will be described.

  The centrifugal casting process mainly includes two steps of melting the raw material and casting. When there is a mold having a desired shape, the time required for forming into a ring shape is several hours. The material of the chemical composition component range of the present invention can be manufactured as a forged or rolled member, but when it is cut out after being molded as a square member, or when it is manufactured by cutting after individual forging, the member It takes at least several months from the production to the processing.

  From these facts, it is preferable from the viewpoint of manufacturing man-hours that the heat-resistant steel member according to the present invention is formed into a ring shape by a centrifugal casting method and then finished by cutting.

  In order to improve the quality of the centrifugal cast member, a hot water may be provided on the inner diameter side of the mold upper lid at the time of vertical centrifugal casting. In addition, in order to improve the quality of centrifugal cast members, the pouring at the time of centrifugal casting is divided into two stages, the heat capacity on the inner diameter side is increased, and the cooling of this part is delayed so that the position of occurrence of casting defects is on the inner diameter side. It is also possible to move to the cutting site. In addition, as described above, not only improving the mold shape and the pouring method of the molten metal, but also changing the aspect ratio of the cross-sectional dimension of the ring-shaped heat-resistant steel member, the casting defect to the final product shape Of course, it should be taken into account that it is avoided.

  Here, the ring-shaped heat-resisting steel member in the chemical composition range of the present invention includes, for example, a blade of a steam turbine as described above, in addition to a divided structure integrally including a diaphragm outer ring, a diaphragm inner ring, and a nozzle plate. , Nozzle plates, diaphragms, various ring parts, ring-shaped sheets, various cylindrical parts, and the like. In addition, the use of the ring-shaped heat-resisting steel member according to the present invention is not limited to the above, and may be used as heat-resisting steel in other fields. In addition, it is preferable that a casting_mold | template is suitably manufactured according to the shape of the member to manufacture.

  Examples of the present invention will be described below.

(First embodiment)
In the first embodiment, the effect when the heat-resistant steel member within the chemical composition range of the present invention is manufactured in a ring shape will be described with reference to the drawings.

  FIG. 1 shows a plan view of a ring-shaped heat-resistant steel member 10 for a nozzle plate, for example. 2 and 3 are plan views of the nozzle plate.

  The ring-shaped heat-resistant steel member 10 has a concentric outer diameter D, inner diameter d, and thickness T, and these D, d, and T take into account the machining allowance for the outer diameter, inner diameter, and thickness of the nozzle plate 20, respectively. It is the dimension set as. Moreover, (alpha) is a center angle corresponding to one division piece at the time of equally dividing the ring-shaped heat-resisting steel member 10.

  The inner and outer peripheries and the upper and lower surfaces of the ring-shaped heat-resistant steel member 10 are integrally machined to necessary dimensions in advance. Thereafter, the ring-shaped heat-resistant steel member 10 is equally divided on a radial line at an angle necessary to form one nozzle plate. Then, “360 / α” nozzle plate members 20 for forming a nozzle plate from one ring-shaped heat-resistant steel member 10 are obtained.

  Here, since the nozzle plate member 20 is cleaved by a radial line, it has a shape conforming to the finished shape. For this reason, particularly the processing accuracy and dimensional accuracy of the circumference are greatly improved, the yield is improved, and the time required for cutting is greatly shortened.

  On the other hand, when a square bar is used as the nozzle plate member, a predetermined reference plane is provided on the cut square bar, the square bar is divided into individual nozzle plate members based on the reference plane, and the divided pieces are cut. In particular, in the case of the nozzle plates 30 and 40 having the fitting portions 31, 32, 41 and 42 on the inner and outer ring side as shown in FIGS. 2 and 3, there is a difference in the dimensions of the inner and outer rings depending on the central angle. The dimensional accuracy of the fitting portion and the yield on the inner ring side are reduced.

  Moreover, since the ring-shaped heat-resistant steel member 10 is manufactured by the centrifugal casting method, the time required for manufacturing the ring-shaped heat-resistant steel member 10 can be greatly shortened. Furthermore, the above-described dimensional accuracy and yield can be improved, and the time required for cutting can be greatly shortened.

(Second embodiment)
In the second embodiment, the reason why the chemical composition range of the present invention is suitable for manufacturing a ring-shaped heat-resistant steel member will be described.

  The ring-shaped heat-resistant steel members (sample heat-resistant steel 1 to sample heat-resistant steel 8, comparative sample heat-resistant steel 1 and comparative sample heat-resistant steel 2) to be used as samples are each composed of about 800 kg of each heat-resistant steel in the atmosphere. Dissolved and centrifugally cast into a ring shape having an outer diameter of 1000 mm, an inner diameter of 400 mm, and a thickness of 120 mm in the atmosphere.

  Table 1 shows the chemical composition of the produced ring-shaped heat-resistant steel member. Of the ring-shaped heat-resistant steel members shown in Table 1, the test heat-resistant steel 1 to the test heat-resistant steel 8 are heat-resistant steel members in the composition range according to the present invention. On the other hand, the comparative test heat resistant steel 1 and the comparative test heat resistant steel 2 are heat resistant steel members whose compositions are not within the chemical composition range of the present invention, and are comparative examples. In addition, the unit of the numerical value shown in Table 1 is weight%.

  Each ring-shaped heat-resistant steel member was subjected to a heat treatment such as quenching and tempering in order to exhibit mechanical characteristics suitable for each material. The heat treatment was performed under different conditions in order to obtain desired mechanical properties for each heat-resistant steel member.

  Test piece members were taken along the radial direction, the tangential direction, and the thickness direction of each ring-shaped heat-resistant steel member subjected to a predetermined heat treatment, and JIS No. 2 mm V notch Charpy impact test pieces were prepared for each. And the Charpy impact test was implemented under 20 degreeC atmospheric temperature using these test pieces. Moreover, normal temperature 0.2% yield strength was measured about each ring-shaped heat-resistant steel member.

  Table 2 shows the measurement results of 20 ° C. impact absorption energy and normal temperature 0.2% yield strength. Table 2 shows the impact absorption energy and the normal temperature 0.2% proof stress value of the test piece taken along the thickness direction as 1, and the results of the test piece taken along the other direction are as follows. , Shown as a ratio to specimens taken along the thickness direction.

  From the results shown in Table 2, the normal temperature 0.2% proof stress of the test heat resistant steel 1 to the test heat resistant steel 8 is 0.9 to 1.1 in any direction, and the 20 ° C. impact absorption energy is 0.8 to 1.1, and it was found that substantially the same tensile properties and impact properties can be exhibited in the radial direction, tangential direction, and thickness direction of each ring-shaped heat-resistant steel member. On the other hand, in the comparative test heat resistant steel 1 and the comparative test heat resistant steel 2, both the room temperature 0.2% proof stress and the 20 ° C. shock absorption energy account for the majority of the values below 0.5, and the material property anisotropy is extremely high. I found it big.

  From this measurement, it has been clarified that the heat-resistant steel member according to the present invention has almost no anisotropy and can obtain homogeneous mechanical properties when manufactured as a ring-shaped member.

  DESCRIPTION OF SYMBOLS 10 ... Ring-shaped heat resistant steel member, 20 ... Nozzle plate, 30, 40 ... Nozzle plate, 31, 32, 41, 42 ... Fitting part, D ... Outer diameter, d ... Inner diameter, T ... Thickness.

Claims (3)

  By weight, C: 0.06 to 0.18%, Si: 0.05 to 0.6%, Mn: 0.2 to 0.8%, Cr: 9 to 11.5%, Ni: 0.0. Contains 1 to 1%, Mo: 0.8 to 1.3%, Nb: 0.05 to 0.5%, V: 0.07 to 0.3%, N: 0.03 to 0.08% A heat-resisting steel member, wherein the balance is made of Fe and inevitable impurities and is formed into a ring shape by centrifugal casting.   The inevitable impurities are, by weight, P: 0.03% or less, S: 0.03% or less, Co: 0.25% or less, Al: 0.05% or less, Ti: 0.05% or less, The heat resistant steel member according to claim 1, wherein Sn is suppressed to 0.04% or less and Cu: 0.25% or less. A method for producing a heat-resistant steel member having the composition component according to claim 1 or 2,
A melting step for dissolving the compositional components constituting the heat-resistant steel member;
The molten molten metal is poured into a rotating mold having a predetermined shape to form a ring-shaped casting, and a centrifugal casting process.
And a heat treatment step of performing heat treatment of quenching and tempering on the casting.

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