KR19980037664A - Heat treatment method of 13% Cr martensitic stainless steel - Google Patents

Heat treatment method of 13% Cr martensitic stainless steel Download PDF

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KR19980037664A
KR19980037664A KR1019960056457A KR19960056457A KR19980037664A KR 19980037664 A KR19980037664 A KR 19980037664A KR 1019960056457 A KR1019960056457 A KR 1019960056457A KR 19960056457 A KR19960056457 A KR 19960056457A KR 19980037664 A KR19980037664 A KR 19980037664A
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stainless steel
martensitic stainless
heat treatment
treatment method
steel
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KR100415918B1 (en
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김기돈
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김종진
포항종합제철 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

본 발명은 높은 강도와 우수한 충격인성을 동시에 확보하느 13%Cr 마르텐사이트계 스테인레스강의 열처리방법에 관한 것이다.The present invention relates to a heat treatment method of 13% Cr martensitic stainless steel which simultaneously secures high strength and excellent toughness.

또한, 본 발명은 13%Cr을 함유하는 마르텐사이트계 스테인리스강에 중량%로 N성분을 0.12-0.18%, Nb성분을 0.03-0.10% 함유시킨 강을 600-650℃ 범위에서 200-400 시간 시효처리한 다음 수냉한 소재를 다시 700-720℃ 범위에서 28-35 시간 소려한 다음 수냉하여, 높은 강도와 우수한 충격인성을 동시에 확보하는 13%Cr마르텐사이트계 스테인리스강 열처리 방법을 제공한다.In addition, the present invention is aged 200-400 hours in a steel of martensitic stainless steel containing 13% Cr containing 0.12-0.18% of N component and 0.03-0.10% of Nb component in the range of 600-650 ° C. After treatment, the water-cooled material is further cooled for 28-35 hours in the range of 700-720 ° C., followed by water cooling, thereby providing a 13% Cr martensitic stainless steel heat treatment method which simultaneously secures high strength and excellent toughness.

Description

13%Cr 마르텐사이트계 스테인리스강의 열처리 방법.Heat treatment method of 13% Cr martensitic stainless steel.

본 발명은 13% Cr을 함유하는 마프텐사이트계 스테인리스강의 열처리 방법에 관한 것으로서, 더욱 상세하게는 높은 강도와 우수한 충격 인성을 동시에 확보하는 13% Cr 마르텐사이트계 스테인리스강의 열처리 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat treatment method for matrices containing stainless steel containing 13% Cr. More particularly, the present invention relates to a heat treatment method for 13% Cr martensite stainless steel that simultaneously secures high strength and excellent impact toughness.

기존의 13% Cr 마르텐사이트계 스테인리스강 제품의 열처리방법은 기존의 공정 순서도인 도1에서 도시된 바와같이, 0.2∼0.3% C이 함유된 소재를 용해-압연-상소둔-냉간압연-연속소둔 한 다음, 최종적으로 제품가공하여 소입-소려 열처리하는 과정을 거치는데, 이 방법으로는 경도를 최대화할 수 없을 뿐만 아니라 충격인성 확보에도 문제가 있으며, 특히 C만으로 경도를 확보할 수 밖에 없기 때문에 열연스트립이나 냉연스트립이나 냉연스트립에 이중판 (lamination)이 발생하는 경우가 있었다.The conventional heat treatment method of the 13% Cr martensitic stainless steel products is melt-rolled-annealed-cold rolled-continuous annealing of 0.2-0.3% C-containing material, as shown in FIG. After that, the product is processed and finally quenched-annealed, which is not only able to maximize the hardness, but also has the problem of securing impact toughness, especially since only C can secure hardness. Lamination has sometimes occurred in strips, cold rolled strips or cold rolled strips.

그리고, 본 발명과 관련된 문헌이난 특허의 예로는 다음과 같은 것들이 있다: Shimada, T.의 A Method to Obtain Fine Chromium Carbides in High Carbon Martensitic Stainless Steel 〔Process and Materials : Innovation Stainless steel Vol.2〕 ; I.Devalliere의 Martensitic Stainless Steels in Cutlery 〔Trzit. Therm., (230),p.61-64〕; Hamman G.의 Corrosion Resistance of Surgical Instruments 〔Met. Prog.,127,(6),p.61-62, 64-65〕; P.J.Hidalgo의 Corrosion Phenomena in AISI 420 Martensitic Stainless Steel 〔Deform Met., (69),p.60-70〕; M.B Horovitz의 Nitrogen Bearing Martensitic Stainless Steels 〔ISIJ International, Vol.36 (1996) No. 7,p.840-845〕; N.Nakamura의 Structural Control of Stainless Steel by Nitrogen Absorption in Solid State 〔ISIJ International, Vol.36 (1996) No.7 p.922-926〕; Descaling chromium Stainless Steel 의 명칭을 갖는 일본특허 58081927호 ; 및 Annealing Stainless Steel Strip without Removing Oxide Scale 의 명칭을 갖는 미국특허 제 3776784호.Examples of non-patented patents related to the present invention include the following: A Method to Obtain Fine Chromium Carbides in High Carbon Martensitic Stainless Steel by Shimada, T. [Process and Materials: Innovation Stainless steel Vol. 2]; Martensitic Stainless Steels in Cutlery by I. Devalliere (Trzit. Therm., (230), p. 61-64; Hamman G. Corrosion Resistance of Surgical Instruments [Met. Prog., 127, (6), p. 61-62, 64-65]; Corrosion Phenomena in AISI 420 Martensitic Stainless Steel (Deform Met., (69), p. 60-70) of P. J. Hidalgo; Nitrogen Bearing Martensitic Stainless Steels by M.B Horovitz [ISIJ International, Vol. 36 (1996) No. 7, p.840-845; Structural Control of Stainless Steel by Nitrogen Absorption in Solid State by N. Nakamura (ISIJ International, Vol. 36 (1996) No. 7 p.922-926); Japanese Patent 58081927 with the name Descaling chromium Stainless Steel; And US Patent No. 3776784, entitled Annealing Stainless Steel Strip without Removing Oxide Scale.

그러나, 상기에 언급된 문헌이나 특허들중 그 어느것도 13%Cr 마르텐사이트계 스테인리스강의 강도와 충격인성을 향상시키는 열처리 방법에 관하여 직접적으로 언급하고 있지 않다.However, none of the above-mentioned documents or patents refers directly to a heat treatment method for improving the strength and impact toughness of 13% Cr martensitic stainless steel.

따라서, 본 발명의 목적은 열연스트립이나 냉연 스트립에 이중판을 발생시킴이 없이 높은 강도와 우수한 충격 인성을 동시에 확보하는 13% Cr 마르텐사이트계 스테인리스강의 열처리 방법을 제공하는데 있다.Accordingly, an object of the present invention is to provide a heat treatment method of 13% Cr martensitic stainless steel that simultaneously secures high strength and excellent impact toughness without generating a double plate on a hot rolled strip or a cold rolled strip.

도1은 기존의 13% 마르텐사이트계 스테인리스강 제품의 열처리 방법을 보여주는 공정 순서도.1 is a process flow chart showing a heat treatment method of a conventional 13% martensitic stainless steel product.

도2는 본 발명에 따른 13% 마르텐사이트계 스테인리스강의 열처리 방법을 보여주는 공정순서도,2 is a process flowchart showing a heat treatment method of 13% martensitic stainless steel according to the present invention;

도3(가) 내지 (나)는 본 발명의 실시예 1에 따라 시효처리했을 때의 시효시간에 따른 경도 변화를 보여주는 그래프,Figure 3 (a) to (b) is a graph showing the change in hardness according to the aging time when the aging treatment according to Example 1 of the present invention,

도4 (가) 내지 (다)는 본 발명의 실시예3에 따라 소려조건 변화 실험을 실시하였을 때의 결과를 보여주는 그래프이다.Figure 4 (a) to (c) is a graph showing the results when the experiment of varying conditions according to Example 3 of the present invention.

상기의 목적을 달성하기 위하여, 본 발명은 13%Cr을 함유하는 마르텐사이트계 스테인리스강에 중량%로 N성분을 0.12∼0.18%, Nb 성분을 0.03∼0.10% 함유시킨 강을 600∼650℃ 범위에서 200∼400 시간 시효처리한 다음, 수냉한 소재를 다시 700∼720℃ 범위에서 28∼35시간 소려한 다음 수냉하여, 높은 강도와 우수한 충격 인성을 동시에 확보하는 30% Cr 마르텐사이트계 스테인리스강 열처리방법을 제공한다.In order to achieve the above object, the present invention provides a steel of martensitic stainless steel containing 13% Cr by weight% in an amount of 0.12 to 0.18% of N component and 0.03 to 0.10% of Nb component in the range of 600 to 650 ° C. 30-Cr martensitic stainless steel heat-treatment at 200-400 hours of aging and then water-cooled to 28-35 hours in the range of 700-720 ° C, followed by water cooling to ensure high strength and good impact toughness simultaneously. Provide a method.

이하, 본 발명을 더욱 상세히 설명하기로 한다.Hereinafter, the present invention will be described in more detail.

본 발명은 발명에 따른 열처리 방법을 보여주는 공정 순서도인 도2에서 표시된 바와같이, 고용화 소둔과 시효처리에 의해 강도를 극대화한 다음 소려하여 강도와 인성을 동시에 추구하는 열처리 방법을 사용하고 있다.As shown in FIG. 2, which is a process flow chart showing a heat treatment method according to the invention, the heat treatment method is used to simultaneously pursue strength and toughness while maximizing strength by solid solution annealing and aging treatment.

그리고, 본발명의 하기실시예 1 내지 3에 따른 열처리 방법에서 사용되는 발명강 및 비교강종의 조성은 다음(표1)과 같다.In addition, the compositions of the inventive steels and the comparative steel species used in the heat treatment method according to Examples 1 to 3 of the present invention are as follows (Table 1).

(표1) 발명강 및 비교강의 조성Table 1 Composition of Inventive and Comparative Steels

상기 (표1)에서의 강번 1 및 2에서, C를 0.3%함유하는 기존의 420J2 강중의 C를 0.12∼0.18% 범위에서 N 으로 대체시키고, 나이트라이드(Nitride)를 미세하게 석출시키고 성장을 억제하기 위해 Nb를 0.5% 함유시켰다. 여기서, 경도를 향상시키기 위해 첨가되는 N의 함량범위를 0.12∼0.18%로 한 것은 0.12%이하이면 강도가 부족해지고, 0.18% 이상은 고용되지 않기 때문이다.In Tables 1 and 2, C in the existing 420J2 steel containing 0.3% of C is replaced with N in the range of 0.12% to 0.18%, and precipitates finely and inhibits growth. In order to contain Nb, 0.5% was contained. Here, the content range of N added in order to improve hardness is 0.12 to 0.18% because the strength is insufficient when 0.12% or less, and 0.18% or more is not dissolved.

(실시예 1)(Example 1)

상기 표 1에서의 4강종을 각각 1200℃에서 1.5시간 동안 고용화소둔시킨 후 공냉하다가 일정온도구역 (550∼700℃)에서 시효처리했을 때의 시효시간에 따른 경도변화를 도3(가) 내지 (라)에 나타내었다. 도3(가)에서 (가) 내지 (라)에서, (가)는 1번강종, (나)는 2번강종, (다)는 3번강종, (라)는 4번 강종에 대한 것이다. 도3 (가) 내지 (라)를 참조하면, 강종 3, 4는 Nb가 함유되어 있지 않기 때문에 Cr-N의 초기석출물이 성장하여 강도가 더 이상 높아지지 않는 것을 알 수 있는데 이는 금속현미경상으로도 확인할 수 있었다. 또한 시효온도는 625℃가 가장 적절하며, 550℃에서는 시효가 충분히 일어나지 않으며, 700℃에서는 과시효 때문에 오히려 경도가 하락하므로 적정시효처리 조건은 600∼650℃ 범위에서 200∼400시간 유지하는 것이 좋다는 것을 알 수 있다.The hardness change according to the aging time when the four steels in Table 1 were annealed in solid solution at 1200 ° C. for 1.5 hours and then air-cooled and aged in a predetermined temperature range (550 to 700 ° C.) is illustrated in FIGS. It is shown to (D). In Fig. 3 (a), (a) to (d), (a) is steel grade 1, (b) steel grade 2, (c) steel grade 3, and (d) is for steel grade 4. 3 (A) to (D), since steel grades 3 and 4 do not contain Nb, it can be seen that the initial precipitate of Cr-N grows and the strength does not increase any more. Could also be confirmed. In addition, the aging temperature of 625 ℃ is most appropriate, the aging does not occur sufficiently at 550 ℃, the hardness decreases due to overaging at 700 ℃, the optimum aging treatment conditions should be maintained for 200 to 400 hours in the 600 ~ 650 ℃ range It can be seen that.

(실시예 2)(Example 2)

상기 (표1)에서의 초기 대상강종 4종류중에서 3, 4번 강종을 제외하고 강도향상효과가 더큰 1번 강종을 대상으로 하여 Nb함량만을 변화시켜 실시예 1에서와 같은 실험을 실시한 결과 다음 (표2)와 같은 결과를 얻었다.Among the four kinds of initial steel grades shown in Table 1, except for steel grades 3 and 4, only the Nb content was changed to steel grade 1 having a greater effect of increasing strength, and then the same experiment as in Example 1 was performed. The same result as Table 2) was obtained.

(표2) Nb함량 변화에 따른 시효후의 경도(Table 2) Hardness after aging according to the change of Nb content

상기의 (표2)로 부터, Nb을 0.03∼0.10% 함유시켰을 때 Cr-N 미세화석출 및 성장억제효과가 있음을 알 수 있으며, 0.10% 이상을 함유시켜도 더 이상의 경도향상효과가 없고 Nb원소의 값이 비싼 점을 고려하면 Nb 함유 적정범위는 0.03∼0.08%인 것으로 판단된다.From Table 2, it can be seen that when 0.03 to 0.10% of Nb is contained, the Cr-N microprecipitation and growth inhibition effect are observed. Even when 0.1b% or more is contained, there is no further hardness improvement effect. Considering the high price, the Nb-containing titration range is considered to be 0.03 to 0.08%.

(실시예 3)(Example 3)

고용화소둔과 시효처리가 끝난 시편을 수냉하고 소려처리하여, 강도와 충격 인성을 극대화하기 위해 (표1)에서의 강종 1을 대상으로 하여 소려조건 변화실험을 실시하였다. 그 결과를 도4 (가) 내지 (다)에 나타내었는데 도4 (나)에서 표시된 바와같이 소려온도 710℃에서 26∼30시간 유지했을 때 경도와 충격인성이 효과적으로 균형을 이루는 것을 알 수 있다.In order to maximize the strength and impact toughness by cooling and annealing the specimens after the solid solution annealing and aging treatment, changes in the sowing conditions were conducted for steel grade 1 in Table 1. The results are shown in Fig. 4 (a) to (c), but as shown in Fig. 4 (b), it can be seen that the hardness and impact toughness are effectively balanced when kept at a temperature of 710 ° C for 26 to 30 hours. .

이상에서 설명한 바와 같이, 본 발명방법에 따라 열처리된 강종은 강도의 향상을 위해 N성분을 첨가했기 때문에 이중판이 발생하지 않을 뿐만 아니라 강도가 높고 충격인성이 우수하다. 또한, C 단독첨가강보다 강도가 훨씬 높고 내공식성도 부가적으로 향상되기 때문에 이 강종을 도물류 생산에 이용할 경우, 부가가치가 높아지고 수명도 연장되는 잇점이 있다.As described above, the steel sheet heat treated according to the method of the present invention does not generate a double plate because N component is added to improve the strength, and also has high strength and excellent impact toughness. In addition, since the strength is much higher than the C additive steel alone and the pitting resistance is further improved, when the steel grade is used for the production of ceramics, the added value is increased and the service life is extended.

Claims (1)

13%Cr을 함유하는 마르텐사이트계 스테인리스강에 중량%로 N 성분을 0.12∼0.18%, Nb 성분을 0.03∼0.10% 함유시킨 강을 600∼650℃ 범위에서 200∼400 시간 시효처리한 다음, 수냉한 소재를 다시 700∼720℃ 범위에서 28∼35시간 소려한 다음 수냉하여, 높은 강도와 우수한 충격인성을 동시에 확보하는 13% Cr 마르텐사이트계 스테인리스강 열처리방법.Martensitic stainless steel containing 13% Cr was aged by weight in a% by weight of 200% to 400 hours at 600 to 650 ° C for 0.1% to 0.18% of the N component and 0.03% to 0.10% of the Nb component. A 13% Cr martensitic stainless steel heat treatment method in which a material is further cooled in the range of 700 to 720 ° C. for 28 to 35 hours, followed by water cooling to secure high strength and excellent impact toughness simultaneously.
KR1019960056457A 1996-11-22 1996-11-22 METHOD FOR HEAT TREATING 13% Cr MARTENSITIC STAINLESS STEEL KR100415918B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100755181B1 (en) * 2006-07-31 2007-09-03 주식회사 포스코 Quenching method of martensitic stainless steel
CN115976313A (en) * 2022-12-16 2023-04-18 贵州航天新力科技有限公司 Production method of 00Cr12Ni10MoTi martensitic stainless steel forging

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JPS62103319A (en) * 1982-02-19 1987-05-13 Kawasaki Steel Corp Production of stainless steel products having high strength and excellent resistance to corrosion, stress corrosion cracking and sulfide cracking
JPS60177134A (en) * 1984-02-24 1985-09-11 Nisshin Steel Co Ltd Production of stainless steel blade
JP2620809B2 (en) * 1989-02-18 1997-06-18 新日本製鐵株式会社 High-strength martensitic stainless steel excellent in high-temperature high-chloride-ion-concentration wet high-pressure carbon dioxide gas environment corrosion resistance and stress corrosion cracking resistance, and method for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100755181B1 (en) * 2006-07-31 2007-09-03 주식회사 포스코 Quenching method of martensitic stainless steel
CN115976313A (en) * 2022-12-16 2023-04-18 贵州航天新力科技有限公司 Production method of 00Cr12Ni10MoTi martensitic stainless steel forging

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