WO1994020258A1 - Inert-gas arc welding wire for high-chromium ferritic heat-resisting steel - Google Patents
Inert-gas arc welding wire for high-chromium ferritic heat-resisting steel Download PDFInfo
- Publication number
- WO1994020258A1 WO1994020258A1 PCT/JP1994/000344 JP9400344W WO9420258A1 WO 1994020258 A1 WO1994020258 A1 WO 1994020258A1 JP 9400344 W JP9400344 W JP 9400344W WO 9420258 A1 WO9420258 A1 WO 9420258A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- welding
- toughness
- present
- welding wire
- steel
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
Definitions
- the present invention relates to a filler metal suitable for welding high-strength heat-resistant steel having high toughness, and more particularly to an inert gas arc welding wire that forms a weld metal having excellent creep characteristics, toughness, and crack resistance at high temperatures. .
- Inert gas arc welding is arc welding performed in an inert gas such as argon or helium, or in a gas atmosphere in which a small amount of active gas is added to these gases.
- an inert gas such as argon or helium
- MIG welding uses a tungsten electrode and provides a filler metal separately.
- MIG welding the welding wire (weld material) itself is used as an electrode.
- a filler material or a welding wire for use in such welding of ferritic heat-resistant steel for example, a 9Cr-Mo-based alloy proposed in Japanese Patent Application Laid-Open No. 60-25791 is disclosed.
- the welding wire for steel is one in which at least one of Nb and V is added in a total amount of 0.3% or less after limiting the contents of C, Si, ⁇ ⁇ Cr, Mo, and Ni.
- the 8 to 12 Cr-based filler material or welding wire proposed in Japanese Patent Application Laid-Open No. 2-280933 is composed of C, Si, Mn, Cr, Ni, and Mo. , W, V. Limiting the content of Nb, Al, and Nr Cr. Becomes 13
- the conventional filler metal or welding wire described above has the drawbacks that a significant improvement in creep strength cannot be expected, and that 5 fluorides are precipitated in the martensite phase and the toughness is significantly reduced. 5 Ferrite is very soft compared to the base martensite. A metal structure in which soft 5x-lite is dispersed in a hard martensite matrix has extremely low toughness against impact. Disclosure of the invention
- An object of the present invention is to provide a filler metal or a welding wire capable of forming a weld metal having high creep strength and excellent toughness in the welding of high Cr hot steel by solving the above-mentioned disadvantages of the prior art. Aim.
- a filler metal or a welding wire capable of forming a weld metal having high creep strength and excellent toughness in the welding of high Cr hot steel by solving the above-mentioned disadvantages of the prior art. Aim.
- the greatest feature of the present invention is that by adding W and B and limiting the contents of Mo and W within the above specified range, the formation of 3 ferrite in the weld metal is suppressed and the creep breaks. This is a remarkable increase in strength and toughness.
- the reasons for limiting each component of the present invention are described below.
- C is required to be at least 0.3% in order to secure hardenability and strength, and to be 0.12% or less so as not to impair the crack resistance.
- Crack J means that the weld metal cracks at high temperatures during welding.
- Si is added as a deoxidizer and contributes to the improvement of oxidation resistance. However, if the Si content exceeds 0.5%, the toughness decreases. Therefore, the upper limit of the Si content is set to 0.5%.
- Mn is necessary not only for deoxidation but also for maintaining strength.
- the lower limit was set to 0.3% as the amount required for deoxidation.
- the upper limit was set to 1.5% in order to avoid adverse effects on toughness.
- Cr is a very important element for ensuring oxidizing and hardening properties of shochu, and it must be present in an amount of 8% or more.
- the upper limit of the Cr content was set to 13% in order to ensure the shochu cracking property and to prevent significant toughness deterioration due to precipitation of ferrite.
- Ni is an element that suppresses the generation of fly and is effective in reducing embrittlement during use, and is used for a long time at high temperatures, such as the welding material of the present invention. Is an essential element. Ni must be present at least 0.05% to secure this effect. However, to ensure good high-temperature creep characteristics, the Ni content is limited to 1.2% or less.
- M 0 enhances high-temperature strength by solid solution strengthening, thereby increasing operating temperature and operating pressure.
- Mo In order to increase the high-temperature strength, particularly the creep rupture strength at the high-temperature long time side in the presence of W, Mo must be present at 0.3% or more. However, if the Mo content is too high, not only does the weldability deteriorate, but it also causes a decrease in toughness due to precipitation of ⁇ 5 ferrite. Therefore, the upper limit of the Mo content was set to 1.6%.
- W is the best solid solution strengthening element that contributes to the creep strength of fly weld metal.
- the effect of improving creep rupture strength at high temperature and long time is remarkably large.
- W In order to exert this effect in the coexistence with Mo, W must be present in an amount of 0.5% or more. However, if W is present in excess, the toughness of the weld metal is reduced due to the precipitation of 5-flight, and welding workability is also deteriorated. Therefore, the upper limit of the W content is 2.5%.
- V must be present in an amount of not less than 0.03% in order to secure strength by being precipitated as carbonitride. However, if the content exceeds 0.40%, the strength is rather lowered. Therefore, the upper limit of the V content is set to 0.40%.
- Nb like V
- Nb is an important element for precipitating as carbonitride to secure strength and also for refining crystal grains to secure toughness.
- Nb must be present at 0.01% or more. However, if it exceeds 0.15%, the effect is not only saturated, but also Since this also causes a decrease, the upper limit of the Nb content is set to 0.15%.
- B When B is present in an amount of 0.0005% or more, B has an effect of improving the high-temperature creep characteristics by strengthening the grain boundaries, but if it exceeds 0.006%, toughness and crack resistance are impaired. Therefore, the B content is limited to the range of 0.0005 to 0.006%.
- N significantly contributes to the improvement of creep resistance whether it is dissolved in the matrix or precipitates as nitride. To obtain this effect, N must be present at 0.01% or more. However, if the content exceeds 0.08%, a problem such as deterioration of toughness due to multiple precipitation of nitrides occurs. Therefore, the upper limit of the N content is set to 0.08%.
- the combined addition of Mo and W significantly improves the high-temperature and long-time creep strength. At that time, considering the strength, toughness, and weldability, it is necessary to limit not only the amounts of M 0 and W added individually but also the total amount of both.
- the range in which M 0 and W are added according to the present invention is shown as an area surrounded by a line connecting points A, B, C and D in FIG. The meaning of each line segment is as follows. Line segment A B corresponds to a W content of 0.5%. The effect of improving the creep strength is substantially obtained when the W content is 0.5% or more (the area on the line AB in FIG. 1 and the area to the right thereof).
- Line BC corresponds to a Mo content of 0.3%. After all, the effect of improving the creep strength is substantially obtained when the Mo content is 0.3% or more (the area on the line BC and the area above it in FIG. 1).
- the total content of M 0 and W is limited to 2.8% or less (the area on the line CD in FIG. 1 and the area to the left of it).
- the line segment DA corresponds to a Mo content of 1.6%.
- the M0 content is limited to 1.6% or less (the area above and below the line DA in FIG. 1).
- FIG. 1 is a graph showing the combined addition range of Mo and W according to the present invention.
- FIG. 2 is a cross-sectional view showing a groove shape of a welded portion used in the example.
- TIG welding (wire NoiTWB 1 to 9) and MIG welding (wire aT WB 10) of several types of high Cr r heat-based heat-resistant mesh plates using the welding wires (diameter l mm 0) with the chemical components shown in Table 1 was done.
- the steel plates used were ASTM A387 7-22, 9-1 "-1 1 ⁇ 0 steel, 9 (: 1 1 Mo-Nb-V-W steel, 9 Cr-10.5 M 0-Nb-V-W steel, 12 Cr-Nb-V-W steel The groove shape is shown in Fig. 2.
- Table 3 shows (wire NaTWB 1 to 9) and MIG welding conditions (wire NotTWB 10).
- the obtained weld metal was subjected to a post heat treatment at 7400 for 4 hours. After that, a clip rupture test at a temperature of 600 and a stress of 20 OMPa and a 2 mmV notch impact test at a test temperature of 0 ° C. were performed. Table 2 summarizes the results of these tests and the results of the weldability investigation.
- the weld metal has a martensite single-phase structure without precipitation of ⁇ 5 filler, and has good toughness and creep rupture characteristics after post-heat treatment. The weldability was also good.
- the welding wires TB11 to TB18 are comparative samples outside the specified range of the present invention.
- the comparative wire TB I 1 is a 2 (l Z4)% Cr- 1% ⁇ -based wire used as a normal heat-resistant steel, and the comparative wire TB 12 is a heat-resistant steel with further improved hot corrosion resistance.
- Ding 8 13 is a 9 ⁇ 1 * -1 ⁇ 0-1 ⁇ ⁇ -V—W-based wire, which has a significantly higher C content than the wire of the present invention, and thus has cracks during welding. Low cracking resistance and low street break value.
- TB15 has a lower C and N content than the chemical composition according to the present invention and does not contain Ni and B, so that creep strength is low and toughness is reduced due to generation of 5-flight. ing.
- TB I 6 is a 9Cr-10 0-Nb-V-W-based wire and contains Mo, W, and B, but the content of Mo and W falls within the range according to the present invention. Due to the deviation, the creep rupture strength is low, and the toughness is reduced due to the generation of 5-fluorite.
- TB I 7 is a 9 Cr-0.5 Mo—Nb—V—W series wire like TB I 5 and contains Mo, W, and B, but contains Mo and W. Since the content is out of the range according to the present invention, the creep rupture strength is low, and the toughness is reduced due to the generation of 5-flight.
- TB I 8 is a 9 Cr—I Mo—V—Nb-based wire, and the contents of Mo and W are within the scope of the present invention, but B is beyond the scope of the present invention. Hot cracking has occurred.
- the welding wire within the composition range according to the present invention is superior to the welding wire outside the composition range according to the present invention in not only high-temperature creep characteristics but also toughness and weldability. You can see that there is.
- the filler metal or welding wire of the present invention has a significantly increased creep strength at high temperatures as compared with the conventional welding wire for 9 to 12% Cr steel.
- the toughness and weldability are also improved.
- the reliability of welded joints is greatly improved by using the filler metal or welding wire according to the present invention.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69432780T DE69432780T2 (de) | 1993-03-10 | 1994-03-03 | Inertgaslichtbogenschweissdraht für temperaturbeständigen hochchromhaltigen ferritischen stahl |
EP94908490A EP0642877B1 (en) | 1993-03-10 | 1994-03-03 | Inert-gas arc welding wire for high-chromium ferritic heat-resisting steel |
US08/335,738 US5519186A (en) | 1993-03-10 | 1994-03-03 | Inert gas arc welding wire for high Cr ferritic heat-resisting steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5/75057 | 1993-03-10 | ||
JP7505793 | 1993-03-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994020258A1 true WO1994020258A1 (en) | 1994-09-15 |
Family
ID=13565199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000344 WO1994020258A1 (en) | 1993-03-10 | 1994-03-03 | Inert-gas arc welding wire for high-chromium ferritic heat-resisting steel |
Country Status (4)
Country | Link |
---|---|
US (1) | US5519186A (ja) |
EP (1) | EP0642877B1 (ja) |
DE (1) | DE69432780T2 (ja) |
WO (1) | WO1994020258A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6110301A (en) * | 1998-07-21 | 2000-08-29 | Stoody Company | Low alloy build up material |
US6232000B1 (en) | 1998-08-28 | 2001-05-15 | Stoody Company | Abrasion, corrosion, and gall resistant overlay alloys |
US7491910B2 (en) * | 2005-01-24 | 2009-02-17 | Lincoln Global, Inc. | Hardfacing electrode |
US7732733B2 (en) * | 2005-01-26 | 2010-06-08 | Nippon Welding Rod Co., Ltd. | Ferritic stainless steel welding wire and manufacturing method thereof |
CN101224527B (zh) * | 2008-02-04 | 2010-09-29 | 湘潭大学 | 高硬度铁素体不锈钢耐磨堆焊药芯焊丝 |
CN101879670B (zh) * | 2010-06-03 | 2012-06-20 | 辽宁工程技术大学 | 一种含有复相金属陶瓷的高耐磨堆焊合金材料 |
CN102441745B (zh) * | 2010-10-13 | 2014-03-26 | 中国科学院金属研究所 | 一种用于高速列车转向架的耐候气体保护焊丝 |
CN101987403B (zh) * | 2010-12-09 | 2012-11-07 | 沈阳航空航天大学 | 一种900MPa级高性能气体保护焊丝 |
CN102658442B (zh) * | 2012-05-08 | 2014-04-30 | 上海电力修造总厂有限公司 | 一种碱性渣系的焊缝金属控Cr且具有抗FAC能力的低合金钢焊条 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61133365A (ja) * | 1984-12-03 | 1986-06-20 | Toshiba Corp | 蒸気タ−ビンロ−タ |
JPS62187596A (ja) * | 1986-02-10 | 1987-08-15 | Nippon Steel Corp | Cr−Mo鋼用テイグ溶接ワイヤ |
JPS63188492A (ja) * | 1987-01-29 | 1988-08-04 | Nippon Steel Corp | 9Cr−Mo系鋼用TIG溶接用ワイヤ |
JPH01215490A (ja) * | 1988-02-24 | 1989-08-29 | Nkk Corp | Cr−Mo系低合金鋼用溶接ワイヤ |
Family Cites Families (11)
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CH369481A (de) * | 1956-01-11 | 1963-05-31 | Birmingham Small Arms Co Ltd | Verfahren zur Erhöhung der Kriechfestigkeit von Chromstahl |
US3554791A (en) * | 1968-10-04 | 1971-01-12 | Westinghouse Electric Corp | Covered welding electrode |
US4487744A (en) * | 1982-07-28 | 1984-12-11 | Carpenter Technology Corporation | Corrosion resistant austenitic alloy |
DE3336221A1 (de) * | 1982-10-06 | 1984-04-12 | Fuji Electric Co., Ltd., Kawasaki, Kanagawa | Fueller fuer gegen schweisshitze bestaendige legierungen auf nickelbasis |
JPS62224481A (ja) * | 1986-03-26 | 1987-10-02 | Kawasaki Steel Corp | フエライト系耐熱鋼のミグア−ク溶接方法 |
JPH02149649A (ja) * | 1988-11-30 | 1990-06-08 | Toshiba Corp | Cr合金鋼 |
JPH0621323B2 (ja) * | 1989-03-06 | 1994-03-23 | 住友金属工業株式会社 | 耐食、耐酸化性に優れた高強度高クロム鋼 |
SE9002276D0 (sv) * | 1990-06-28 | 1990-06-28 | Abb Powdermet Ab | Saett att framstaella fulltaeta kroppar av varmhaallfast martensitiskt cr-staal |
JP2551511B2 (ja) * | 1992-01-07 | 1996-11-06 | 新日本製鐵株式会社 | 高Crフェライト系耐熱鋼用溶接材料 |
JP2551512B2 (ja) * | 1992-01-07 | 1996-11-06 | 新日本製鐵株式会社 | 高Crフェライト系耐熱鋼用溶接材料 |
JP2561592B2 (ja) * | 1992-02-07 | 1996-12-11 | 新日本製鐵株式会社 | 高Crフェライト系耐熱鋼用溶接材料 |
-
1994
- 1994-03-03 WO PCT/JP1994/000344 patent/WO1994020258A1/ja not_active Application Discontinuation
- 1994-03-03 US US08/335,738 patent/US5519186A/en not_active Expired - Fee Related
- 1994-03-03 EP EP94908490A patent/EP0642877B1/en not_active Revoked
- 1994-03-03 DE DE69432780T patent/DE69432780T2/de not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61133365A (ja) * | 1984-12-03 | 1986-06-20 | Toshiba Corp | 蒸気タ−ビンロ−タ |
JPS62187596A (ja) * | 1986-02-10 | 1987-08-15 | Nippon Steel Corp | Cr−Mo鋼用テイグ溶接ワイヤ |
JPS63188492A (ja) * | 1987-01-29 | 1988-08-04 | Nippon Steel Corp | 9Cr−Mo系鋼用TIG溶接用ワイヤ |
JPH01215490A (ja) * | 1988-02-24 | 1989-08-29 | Nkk Corp | Cr−Mo系低合金鋼用溶接ワイヤ |
Also Published As
Publication number | Publication date |
---|---|
EP0642877B1 (en) | 2003-06-04 |
EP0642877A1 (en) | 1995-03-15 |
US5519186A (en) | 1996-05-21 |
DE69432780T2 (de) | 2003-12-11 |
DE69432780D1 (de) | 2003-07-10 |
EP0642877A4 (en) | 1997-05-21 |
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