WO1994026947A1 - Acier thermoresitant austenitique a resistance elevee presentant une excellente soudabilite et une bonne resistance a la corrosion a haute temperature - Google Patents

Acier thermoresitant austenitique a resistance elevee presentant une excellente soudabilite et une bonne resistance a la corrosion a haute temperature Download PDF

Info

Publication number
WO1994026947A1
WO1994026947A1 PCT/JP1994/000767 JP9400767W WO9426947A1 WO 1994026947 A1 WO1994026947 A1 WO 1994026947A1 JP 9400767 W JP9400767 W JP 9400767W WO 9426947 A1 WO9426947 A1 WO 9426947A1
Authority
WO
WIPO (PCT)
Prior art keywords
corrosion resistance
temperature corrosion
steel
strength
austenitic heat
Prior art date
Application number
PCT/JP1994/000767
Other languages
English (en)
Japanese (ja)
Inventor
Hiroyuki Mimura
Masao Kikuchi
Satoshi Araki
Hisashi Naoi
Original Assignee
Nippon Steel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corporation filed Critical Nippon Steel Corporation
Priority to EP94914608A priority Critical patent/EP0708184A4/fr
Publication of WO1994026947A1 publication Critical patent/WO1994026947A1/fr

Links

Classifications

    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent

Definitions

  • the present invention is an austenitic heat-resistant material that has extremely good high-temperature strength, has excellent weldability and good high-temperature corrosion resistance, and exhibits excellent performance when applied to a boiler whose operating environment is becoming severer. It concerns steel. Background art
  • ultra-supercritical boilers with high-temperature and high-pressure steam conditions are being planned in terms of improving economic efficiency and suppressing carbon dioxide emissions in recent years.
  • high-strength materials that can withstand use in such harsh environments include “Iron and Steel”, 70th year, S1409, or “Thermal Nuclear Power”, volume 38, page 75.
  • heat-resistant austenitic steels utilizing precipitation strengthening with carbonitrides such as Nb and Ti and solid solution strengthening with Mo have been developed.
  • An object of the present invention is to provide an austenitic heat-resistant steel having good weldability and excellent high-temperature strength and high-temperature corrosion resistance. Disclosure of the invention
  • the present inventors conducted various experiments on steel to which Mo and W were added to compensate for the decrease in high-temperature strength due to the reduction in the amount of C by solid solution strengthening. And succeeded in producing heat-resistant steel with high-temperature corrosion resistance. That is, the gist of the present invention is as follows.
  • a high-strength austenitic heat-resistant steel with excellent weldability and good high-temperature corrosion resistance characterized by containing Fe and the balance of Fe and unavoidable impurities.
  • Fig. 1 is a graph showing the effect of Mo and W on the high temperature corrosion resistance of 20Cr-25Ni steel.
  • FIG. 2 is a graph comparing the creep rupture strength of the steel of the present invention and the comparative steel with the loss of hot corrosion.
  • FIG. 3 is a graph showing the results of ballistic strain tests of SUS 347H and steels in which the main alloying elements other than C are within the scope of the present invention.
  • FIG. 3 shows the main alloying sources other than C Steel (Cr: 20 Ni: 25 W: 3%) in which the amount of carbon was changed (marked with ⁇ in the figure) and S US 347 H ( This corresponds to the comparative steel K in the examples described later.In the figure, the results of the varestraint test for evaluating the weldability of the squares are shown.
  • test conditions were: specimen thickness: 5 mm, welding method: GTAW, welding voltage: 10 V, welding current: 80 A, welding speed: 80 mm / min, and added strain: 2%. Based on the results of this test, the upper limit of the amount of C to secure good weldability was set at less than 0.02%, aiming at the same level as SUS347H.
  • Si is an element that not only is effective as a deoxidizing agent, but also improves oxidation resistance and high-temperature corrosion resistance.However, too much Si reduces creep rupture strength and toughness. . Therefore, the upper limit was set to 1.5%.
  • Mn is an element that has a deoxidizing effect and improves weldability and hot workability.
  • the lower limit of Mn was set to 0.3% in order to sufficiently deoxidize and obtain a sound lump. However, if the amount of Mn is too large, the oxidation resistance deteriorates, so the upper limit was set to 1.5%.
  • Cr is an element indispensable for oxidation resistance, steam oxidation resistance, and high temperature corrosion resistance.
  • the lower limit of the Cr content was set to 18%, which is the same as the Cr content of the austenitic stainless steel.
  • an increase in the Cr content lowers the stability of austenite, weakens the high-temperature strength, promotes the formation of intermetallic compound phases, and lowers the toughness.
  • Ni increases the austenite stability and suppresses the formation of the ⁇ phase. It is an essential element. In order to achieve austenite stability against the content of ferrite-forming elements such as Cr, the Ni content must be 20% or more. On the other hand, if the amount of Ni exceeds 40%, it is disadvantageous in terms of price, so the amount of Ni was set to 20 to 40%.
  • Both M0 and W are elements that significantly increase the high-temperature strength by solid solution strengthening, etc., but their effects are small when added to less than 0.5%, respectively, and when W exceeds 10%, Laves phase etc. This causes precipitation of intermetallic compounds, and reduces creep rupture ductility.
  • Mo is added alone
  • the high-temperature corrosion resistance deteriorates as the amount of Mo increases.
  • W must be added, and the range is 0.5 to 10%. If Mo is added in excess of 2.0%, the high-temperature corrosion resistance is particularly deteriorated even when W is added in a complex manner. Therefore, 0.5 to 2.0% is added as necessary.
  • Nb and Ti form fine carbonitrides and significantly improve the long-term cleave rupture strength.
  • the 1 ⁇ 13 amount is less than (3.05% and the Ti amount is less than 0.01%, the above effect cannot be obtained, so the lower limits of the Nb and Ti amounts are set to 05% and 0.01%, respectively.
  • the above effect is more remarkable as the amount of Nb and Ti that can form a solid solution at the solution heat treatment temperature increases, but when the Nb and Ti are added beyond the solid solubility limit, undissolved carbon-nitride Therefore, the upper limit of the amount of Nb and T i is set to 0.4% and 0.2%, respectively, and the amount of solid solution (Nb + T i) is increased within that range. To do this, Nb and Ti were added in combination.
  • B is an element that improves the cleave rupture strength as a result of increasing the grain boundary strength, but its effect is small when it is less than 0.03%, and when it exceeds 0.08%, the weldability and hot work Since the workability is reduced, the range of the B content is set to 0.003 to 0.008%.
  • N is an element that significantly improves the creep rupture strength by solid solution strengthening and the formation of nitrides. If N is less than 0.05%, the decrease in strength due to the low C content in order to improve weldability cannot be compensated for, and even if added over 3%, the increase in long-term creep rupture strength will not increase. Less, further reduces toughness. Therefore, the range of the amount of N was set to 0.05 to 0.3%.
  • U is a comparative steel.
  • ⁇ is SUS 347 ⁇ equivalent steel that has been commonly used.
  • the steel of the present invention has extremely excellent high-temperature strength and high-temperature corrosion resistance as compared with SUS 347H steel.
  • L to 0 are examples in which the high-temperature strength is low without the addition of Mo and W and the Nb or B content is out of the range of the present invention.
  • P to U have relatively high strength at high temperatures, even when Mo is added alone or in combination with W, the amount of Mo is large and the high temperature corrosion resistance is poor.
  • Fig. 1 shows the effect of Mo and W on the high-temperature corrosion resistance of 20Cr—25Ni steel.
  • Mo alone is added (indicated by hatching in the figure)
  • the corrosion loss is large.
  • the high-temperature corrosion resistance is improved by adding a 1.5% composite (in the figure).
  • corrosion loss is not changed by adding W alone (indicated by ⁇ in the figure).
  • Figure 2 compares the cleave rupture strength and hot corrosion weight loss of the steel of the present invention and the comparative steel.
  • the comparative steel has low high-temperature strength and / or high-temperature corrosion resistance. It can be seen that the steel of the present invention is excellent in both high-temperature strength and high-temperature corrosion resistance.
  • an austenitic heat-resistant steel with excellent weldability and high-temperature strength and high-temperature corrosion resistance. It can be done.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un acier thermorésistant austénitique à résistance élevée présentant une excellent soudabilité et une bonne résistance à la corrosion à haute température, et pouvant présenter un excellent rendement lorsqu'on l'emploie comme matériau de chaudière à utiliser dans des conditions devenant de plus en plus sévères. L'acier comprend moins 0,02 % (en masse, également applicable ci-après) de carbone, au plus 1,5 % de silicium, 0,3 à 1,5 % de manganèse, au plus 0,02 % de phosphore, au plus 0,005 % de soufre, 18 à 26 % de chrome, 20 à 40 % de nickel, 0,5 à 10,0 % de tungstène, 0,05 à 0,4 % de niobium, 0,01 à 0,2 % de titane, 0,003 à 0,008 % de bore, 0,05 à 0,3 % d'azote, et si nécessaire au moins un des éléments suivants: 0,05 à 2 % de molybdène et/ou 0,001 à 0,05 % de magnésium, 0,001 à 0,05 % de calcium et 0,001 à 0,15 % d'un élément de terre rare (REM), le solde étant constitué de fer et d'impuretés inévitables.
PCT/JP1994/000767 1993-05-13 1994-05-12 Acier thermoresitant austenitique a resistance elevee presentant une excellente soudabilite et une bonne resistance a la corrosion a haute temperature WO1994026947A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94914608A EP0708184A4 (fr) 1993-05-13 1994-05-12 Acier thermoresitant austenitique a resistance elevee presentant une excellente soudabilite et une bonne resistance a la corrosion a haute temperature

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5111957A JPH06322488A (ja) 1993-05-13 1993-05-13 溶接性に優れ、耐高温腐食特性が良好な高強度オーステナイト系耐熱鋼
JP5/111957 1993-05-13

Publications (1)

Publication Number Publication Date
WO1994026947A1 true WO1994026947A1 (fr) 1994-11-24

Family

ID=14574397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1994/000767 WO1994026947A1 (fr) 1993-05-13 1994-05-12 Acier thermoresitant austenitique a resistance elevee presentant une excellente soudabilite et une bonne resistance a la corrosion a haute temperature

Country Status (4)

Country Link
EP (1) EP0708184A4 (fr)
JP (1) JPH06322488A (fr)
CA (1) CA2162704A1 (fr)
WO (1) WO1994026947A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739870A1 (fr) * 1995-10-17 1997-04-18 Carondelet Foundry Co Alliage refractaire, tenace et soudable
CN114032434A (zh) * 2021-10-27 2022-02-11 江苏金合特种合金材料有限公司 高耐蚀n08120材料冶炼及大口径无缝管生产工艺
CN115505820A (zh) * 2022-09-15 2022-12-23 山西太钢不锈钢股份有限公司 一种含铌高氮镍基合金的连铸方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4424471B2 (ja) * 2003-01-29 2010-03-03 住友金属工業株式会社 オーステナイト系ステンレス鋼およびその製造方法
CN100406608C (zh) * 2005-04-18 2008-07-30 张光华 超强型耐热钢
US7815848B2 (en) * 2006-05-08 2010-10-19 Huntington Alloys Corporation Corrosion resistant alloy and components made therefrom
JP5670103B2 (ja) * 2010-06-15 2015-02-18 山陽特殊製鋼株式会社 高強度オーステナイト系耐熱鋼
JP5661001B2 (ja) * 2011-08-23 2015-01-28 山陽特殊製鋼株式会社 時効後靭性に優れた高強度オーステナイト系耐熱鋼
JP5930635B2 (ja) * 2011-09-26 2016-06-08 山陽特殊製鋼株式会社 優れた高温強度を有するオーステナイト系耐熱鋼とその製造方法
JP5273266B2 (ja) * 2012-02-08 2013-08-28 新日鐵住金株式会社 二重管およびそれを用いた溶接構造体
ES2803574T3 (es) * 2014-01-27 2021-01-28 Nippon Steel Corp Material de soldadura para aleación a base de níquel resistente al calor y metal soldado y unión soldada formada usando los mismos
JP6955322B2 (ja) * 2016-03-15 2021-10-27 山陽特殊製鋼株式会社 加工性、高温強度および時効後の靱性に優れたオーステナイト系耐熱鋼

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6254179B2 (fr) * 1979-12-06 1987-11-13 Daido Steel Co Ltd
JPS63183155A (ja) * 1987-01-24 1988-07-28 Nippon Steel Corp 高強度オ−ステナイト系耐熱合金
JPS6344814B2 (fr) * 1980-01-25 1988-09-07 Daido Steel Co Ltd

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6333549A (ja) * 1986-07-29 1988-02-13 Nippon Kokan Kk <Nkk> 耐石炭灰腐食ボイラ用オ−ステナイト鋼管およびその製造法
JP2510206B2 (ja) * 1987-07-03 1996-06-26 新日本製鐵株式会社 Ｓｉ含有量の少ない高強度オ−ステナイト系耐熱鋼

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6254179B2 (fr) * 1979-12-06 1987-11-13 Daido Steel Co Ltd
JPS6344814B2 (fr) * 1980-01-25 1988-09-07 Daido Steel Co Ltd
JPS63183155A (ja) * 1987-01-24 1988-07-28 Nippon Steel Corp 高強度オ−ステナイト系耐熱合金

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0708184A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739870A1 (fr) * 1995-10-17 1997-04-18 Carondelet Foundry Co Alliage refractaire, tenace et soudable
GB2306504A (en) * 1995-10-17 1997-05-07 Carondelet Foundry Co Tough weldable heat resistant alloy
CN114032434A (zh) * 2021-10-27 2022-02-11 江苏金合特种合金材料有限公司 高耐蚀n08120材料冶炼及大口径无缝管生产工艺
CN114032434B (zh) * 2021-10-27 2023-09-26 江苏金合特种合金材料有限公司 高耐蚀n08120材料冶炼及大口径无缝管生产工艺
CN115505820A (zh) * 2022-09-15 2022-12-23 山西太钢不锈钢股份有限公司 一种含铌高氮镍基合金的连铸方法
CN115505820B (zh) * 2022-09-15 2024-01-05 山西太钢不锈钢股份有限公司 一种含铌高氮镍基合金的连铸方法

Also Published As

Publication number Publication date
CA2162704A1 (fr) 1994-11-24
EP0708184A4 (fr) 1996-07-03
EP0708184A1 (fr) 1996-04-24
JPH06322488A (ja) 1994-11-22

Similar Documents

Publication Publication Date Title
US5298093A (en) Duplex stainless steel having improved strength and corrosion resistance
JPH0621323B2 (ja) 耐食、耐酸化性に優れた高強度高クロム鋼
JPH0885849A (ja) 高Ｃｒフェライト系耐熱鋼
JP3982069B2 (ja) 高Ｃｒフェライト系耐熱鋼
JP5137934B2 (ja) フェライト系耐熱鋼
JP2000248337A (ja) ボイラ用高Ｃｒフェライト系耐熱鋼の耐水蒸気酸化特性改善方法および耐水蒸気酸化特性に優れたボイラ用高Ｃｒフェライト系耐熱鋼
WO1994026947A1 (fr) Acier thermoresitant austenitique a resistance elevee presentant une excellente soudabilite et une bonne resistance a la corrosion a haute temperature
JP3388998B2 (ja) 溶接性に優れた高強度オーステナイト系耐熱鋼
JPS6123749A (ja) 高温強度オ−ステナイト系ステンレス鋼
JPS5914097B2 (ja) 靭性を改良せるフェライト系耐熱鋼
JPH07138708A (ja) 高温強度と熱間加工性の良好なオーステナイト鋼
JP2561592B2 (ja) 高Ｃｒフェライト系耐熱鋼用溶接材料
JP4523696B2 (ja) 高温強度に優れたオーステナイト系耐熱鋼用ｔｉｇ溶接材料
JP3531228B2 (ja) 高Ｃｒフェライト系耐熱鋼
JPH0121864B2 (fr)
JPH06228713A (ja) 高温強度および被削性の優れたオーステナイト系耐熱鋳鋼およびそれからなる排気系部品
JP2002180208A (ja) フェライト系耐熱鋼
JPS63183155A (ja) 高強度オ−ステナイト系耐熱合金
JP3367831B2 (ja) 高強度フェライト系耐熱鋼用溶接材料
JP3367824B2 (ja) フェライト系耐熱鋼用溶接材料
JPH0142346B2 (fr)
JP3565155B2 (ja) 高強度低合金耐熱鋼
JPH06228712A (ja) 高温強度および被削性の優れたオーステナイト系耐熱鋳鋼およびそれからなる排気系部品
JP3426880B2 (ja) 高強度フェライト系耐熱鋼用溶接材料
JPH10225792A (ja) 高温強度に優れたオーステナイト系耐熱鋼用ｔｉｇ溶接材料

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 1995 545673

Country of ref document: US

Date of ref document: 19951031

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2162704

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 1994914608

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1994914608

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1994914608

Country of ref document: EP