WO1994026947A1 - High-strength austenitic heat-resisting steel with excellent weldability and good high-temperature corrosion resistance - Google Patents
High-strength austenitic heat-resisting steel with excellent weldability and good high-temperature corrosion resistance Download PDFInfo
- 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
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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.
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- 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
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94914608A EP0708184A4 (en) | 1993-05-13 | 1994-05-12 | High-strength austenitic heat-resisting steel with excellent weldability and good high-temperature corrosion resistance |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5111957A JPH06322488A (en) | 1993-05-13 | 1993-05-13 | High-strength austenitic heat resistant steel excellent in weldability and satisfactory in high temperature corrosion resistance |
JP5/111957 | 1993-05-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994026947A1 true WO1994026947A1 (en) | 1994-11-24 |
Family
ID=14574397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000767 WO1994026947A1 (en) | 1993-05-13 | 1994-05-12 | High-strength austenitic heat-resisting steel with excellent weldability and good high-temperature corrosion resistance |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0708184A4 (en) |
JP (1) | JPH06322488A (en) |
CA (1) | CA2162704A1 (en) |
WO (1) | WO1994026947A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2739870A1 (en) * | 1995-10-17 | 1997-04-18 | Carondelet Foundry Co | REFRACTORY, TOUGH AND WELDABLE ALLOY |
CN114032434A (en) * | 2021-10-27 | 2022-02-11 | 江苏金合特种合金材料有限公司 | High corrosion-resistant N08120 material smelting and large-caliber seamless pipe production process |
CN115505820A (en) * | 2022-09-15 | 2022-12-23 | 山西太钢不锈钢股份有限公司 | Continuous casting method of niobium-containing high-nitrogen nickel-based alloy |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4424471B2 (en) * | 2003-01-29 | 2010-03-03 | 住友金属工業株式会社 | Austenitic stainless steel and method for producing the same |
CN100406608C (en) * | 2005-04-18 | 2008-07-30 | 张光华 | Ultra-strong refractory steel |
US7815848B2 (en) * | 2006-05-08 | 2010-10-19 | Huntington Alloys Corporation | Corrosion resistant alloy and components made therefrom |
JP5670103B2 (en) * | 2010-06-15 | 2015-02-18 | 山陽特殊製鋼株式会社 | High strength austenitic heat resistant steel |
JP5661001B2 (en) * | 2011-08-23 | 2015-01-28 | 山陽特殊製鋼株式会社 | High strength austenitic heat resistant steel with excellent post-aging toughness |
JP5930635B2 (en) * | 2011-09-26 | 2016-06-08 | 山陽特殊製鋼株式会社 | Austenitic heat resistant steel having excellent high temperature strength and method for producing the same |
JP5273266B2 (en) * | 2012-02-08 | 2013-08-28 | 新日鐵住金株式会社 | Double pipe and welded structure using the same |
JP6197885B2 (en) * | 2014-01-27 | 2017-09-20 | 新日鐵住金株式会社 | Welding material for Ni-base heat-resistant alloy, weld metal and welded joint using the same |
JP6955322B2 (en) * | 2016-03-15 | 2021-10-27 | 山陽特殊製鋼株式会社 | Austenitic heat-resistant steel with excellent workability, high-temperature strength and toughness after aging |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6254179B2 (en) * | 1979-12-06 | 1987-11-13 | Daido Steel Co Ltd | |
JPS63183155A (en) * | 1987-01-24 | 1988-07-28 | Nippon Steel Corp | High-strength austenitic heat-resisting alloy |
JPS6344814B2 (en) * | 1980-01-25 | 1988-09-07 | Daido Steel Co Ltd |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6333549A (en) * | 1986-07-29 | 1988-02-13 | Nippon Kokan Kk <Nkk> | Austenitic steel tube for boiler having resistance to corrosion by coal ash and its manufacture |
JP2510206B2 (en) * | 1987-07-03 | 1996-06-26 | 新日本製鐵株式会社 | High strength austenitic heat resistant steel with low Si content |
-
1993
- 1993-05-13 JP JP5111957A patent/JPH06322488A/en not_active Withdrawn
-
1994
- 1994-05-12 WO PCT/JP1994/000767 patent/WO1994026947A1/en not_active Application Discontinuation
- 1994-05-12 EP EP94914608A patent/EP0708184A4/en not_active Withdrawn
- 1994-05-12 CA CA 2162704 patent/CA2162704A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6254179B2 (en) * | 1979-12-06 | 1987-11-13 | Daido Steel Co Ltd | |
JPS6344814B2 (en) * | 1980-01-25 | 1988-09-07 | Daido Steel Co Ltd | |
JPS63183155A (en) * | 1987-01-24 | 1988-07-28 | Nippon Steel Corp | High-strength austenitic heat-resisting alloy |
Non-Patent Citations (1)
Title |
---|
See also references of EP0708184A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2739870A1 (en) * | 1995-10-17 | 1997-04-18 | Carondelet Foundry Co | REFRACTORY, TOUGH AND WELDABLE ALLOY |
GB2306504A (en) * | 1995-10-17 | 1997-05-07 | Carondelet Foundry Co | Tough weldable heat resistant alloy |
CN114032434A (en) * | 2021-10-27 | 2022-02-11 | 江苏金合特种合金材料有限公司 | High corrosion-resistant N08120 material smelting and large-caliber seamless pipe production process |
CN114032434B (en) * | 2021-10-27 | 2023-09-26 | 江苏金合特种合金材料有限公司 | Smelting of high corrosion resistant N08120 material and production process of large-caliber seamless pipe |
CN115505820A (en) * | 2022-09-15 | 2022-12-23 | 山西太钢不锈钢股份有限公司 | Continuous casting method of niobium-containing high-nitrogen nickel-based alloy |
CN115505820B (en) * | 2022-09-15 | 2024-01-05 | 山西太钢不锈钢股份有限公司 | Continuous casting method of niobium-containing high-nitrogen nickel-based alloy |
Also Published As
Publication number | Publication date |
---|---|
CA2162704A1 (en) | 1994-11-24 |
EP0708184A1 (en) | 1996-04-24 |
JPH06322488A (en) | 1994-11-22 |
EP0708184A4 (en) | 1996-07-03 |
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