CN101972903A - Repair welding wire for flaws of cast two-phase stainless steel 6A - Google Patents
Repair welding wire for flaws of cast two-phase stainless steel 6A Download PDFInfo
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Abstract
The invention discloses a repair welding wire for flaws of cast two-phase stainless steel 6A. The two-phase stainless steel 6A refers to 25Cr-7Ni-Mo-N(6A), and the repair welding wire basically comprises: carbon: not larger than 0.03%, silicon: not larger than 0.7%, manganese: not larger than 0.7%, chrome: 25.0-26.0%, molybdenum: 3.0-3.2%, copper:0.5-0.7%, tungsten: 0.5-1.0%, nickel: larger than 8.5-9.0%, nitrogen: 0.30-0.40%, other unavoidable impurities and elements: smaller than 0.06%, and the balance of iron. The repair welding wire with phi 2mm is finally formed by carrying the steps of refining, hot forging, multiple cold pulling and annealing on the basic constituents, satisfies the requirements of the two-phase stainless steel 6A on erosion corrosion resistance and cavitation corrosion resistance, and guarantees that a flawed repair welded position of the cast two-phase stainless steel 6A has favorable erosion corrosion resistance and cavitation corrosion resistance.
Description
Technical field
The invention belongs to technical field of welding materials, especially a kind of repair welding welding wire that is exclusively used in two phase stainless steel 6A casting back defective, this two phase stainless steel 6A refers in particular in the present invention into 25Cr-7Ni-Mo-N (6A).
Background technology
25Cr-7Ni-Mo-N (6A) is wherein a kind of material in the two phase stainless steel type just, its ferritic phase almost respectively accounts for half mutually with austenite in the tissue of this material, therefore the characteristics of the existing austenitic stainless steel of 25Cr-7Ni-Mo-N (6A) have the characteristics of ferritic stainless steel again, plasticity and the toughness of comparing 25Cr-7Ni-Mo-N (6A) with ferritic stainless steel are higher, there is no room temperature fragility, intergranular corrosion resistance performance and welding performance are significantly increased, also maintain the 475 ℃ of fragility and the thermal conductivity factor height of ferritic stainless steel simultaneously, have characteristics such as superplasticity.Compare the corrosion of the intensity height of 25Cr-7Ni-Mo-N (6A) and intergranular corrosion resistance and anti-chloride stress cracking is significantly improved with austenitic stainless steel.
According to U.S. ASTM-A890 " general purpose Fe-Cr-Ni-Mo base anti-corrosion two-phase (austenite/ferrite) stainless cast steel part standard criterion ", the chemical composition content of 25Cr-7Ni-Mo-N (6A) two phase stainless steel (6A in the bracket is its corresponding grade trade mark) see the following form (wt%):
The erosion corrosion speed following table of 25Cr-7Ni-Mo-N (6A): (unit: the every square meter of milligram per hour)
The cavitation damage speed of 25Cr-7Ni-Mo-N (6A) sees the following form: (unit: per hour restrain every square meter)
Because 25Cr-7Ni-Mo-N (6A) has excellent anti-erosion corrosion and cavitation-corrosion-resistant performance, application in pump valve class foundry goods is very extensive, range of application is also very wide abroad, as on naval vessels as spiral propeller, as ocean industrial aspect such as oil fields at sea as axial-flow pump, axle, high-pressure pump or seawater jet pump etc.
25Cr-7Ni-Mo-N (6A) generally adopts casting to produce foundry goods, foundry goods inevitably can produce casting flaw usually for this reason, it is a part very important in the pump housing castings production that casting flaw is carried out Welding Repair, and Welding Repair is except having the rational welding, it is highly important that the selection of repair welding material, repair welding material mistake or underproof will directly cause scrapping of former parts.
Because it is shorter that 25Cr-7Ni-Mo-N (6A) enters the time of standard, on China market, also be not used in the repair welding material of casting 25Cr-7Ni-Mo-N (6A) at present, Foundry Production producer adopts other wlding to replace usually.Because the mother metal composition of other wlding and 25Cr-7Ni-Mo-N (6A) does not match, therefore cause casting flaw position its mis-behave after Welding Repair, the anti-erosion corrosion performance and the cavitation-corrosion-resistant performance of 25Cr-7Ni-Mo-N (6A) have been reduced, the waster rate is high, limited the application of 25Cr-7Ni-Mo-N (6A) on pump valve class foundry goods greatly, the waste of generation is great.
Summary of the invention
For addressing the above problem, the invention provides a kind of repair welding welding wire that is exclusively used in two phase stainless steel 6A casting back defective, this repair welding welding wire only is used for the repair welding of 25Cr-7Ni-Mo-N (6A) casting back defective, it is low to have welding cost with respect to present alternative repair welding material, welding process is reliable and stable, the repair welding position near or be better than the anti-erosion corrosion performance and the cavitation-corrosion-resistant performance of mother metal, the repair welding position that has guaranteed 25Cr-7Ni-Mo-N (6A) two phase stainless steel casting back defective has good anti-erosion corrosion and cavitation-corrosion-resistant performance, has improved the utilization rate of 25Cr-7Ni-Mo-N (6A) cast member.
In order to realize the foregoing invention purpose, the present invention has adopted following technical scheme:
The described repair welding welding wire that is used for two phase stainless steel 6A casting back defective, described two phase stainless steel 6A is meant 25Cr-7Ni-Mo-N (6A), the basic chemical composition of this repair welding welding wire is constructed as follows by weight percentage:
Carbon≤0.03%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-26.0%, molybdenum 3.0-3.2%, copper 0.5-0.7%, tungsten 0.5-1.0%, other unavoidable impurities and element＜0.06% and balance iron;
Feature of the present invention is also to be added with in above-mentioned described basic chemical composition＞nickel of 8.5-9.0% and the nitrogen of 0.30-0.40%, and the repair welding welding wire that adds nickel and nitrogen always is constructed as follows by weight percentage:
Carbon≤0.03%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-26.0%, nickel＞8.5-9.0%, nitrogen 0.30-0.40%, molybdenum 3.0-3.2%, copper 0.5-0.7%, tungsten 0.5-0.7%, other unavoidable impurities and element＜0.06% and balance iron.
By above-mentioned total formation proportioning prepare burden the back and adopt the argon-oxygen-decarburizing process refining to go out repair welding welding wire ingot casting, described refining process is to carry out under normal atmospheric pressure and be blown into oxygen, argon gas and nitrogen, forge hot when described repair welding welding wire ingot casting is heated to 950 ℃-1100 ℃ afterwards, after the forge hot repair welding welding wire ingot casting is carried out the surface finish cleaning, be rolled into the repair welding welding wire pole of φ 6mm when being heated to 1000 ℃-1100 ℃ again, afterwards described repair welding welding wire pole is carried out the cold drawn of multi-pass and annealing, the final repair welding welding wire that forms φ 2mm, the mechanical property of described repair welding welding wire should satisfy:
1. fracture strength R
m(MPa) 〉=690;
2. yield strength R
P0.2(MPa) 〉=450;
3. contraction percentage of area A (%) 〉=27.
The described repair welding welding wire that satisfies mechanical property in the repair welding that is exclusively used in casting 25Cr-7Ni-Mo-N (6A) two phase stainless steel casting back defective is:
Welding current is controlled between the 136-160A, and weldingvoltage is controlled between the 22-30V, if multi-pass welding then the temperature between key-course in 150 ℃.
Owing to adopted aforesaid technical scheme, the present invention has following superiority:
1, the constituent ratio of the basic chemical composition of repair welding welding wire of the present invention and 25Cr-7Ni-Mo-N (6A) is more approaching, but total formation one of repair welding welding wire of the present invention is the content ratio that has improved nickel, and the 2nd, added the nitrogen element.New nitrogen that adds and the content ratio that improves nickel simultaneously can guarantee that the welding position austenite is mutually easier in welding process and separate out, and reaching ferritic phase and austenite proper ratio mutually, thereby guarantees the institutional framework of the two-phase coexistent that the welding position is complete.
2, total formation of repair welding welding wire of the present invention and 25Cr-7Ni-Mo-N (6A) two-phase stainless steel chemical composition and phase structure are complementary, therefore can satisfy the anti-erosion corrosion performance and the cavitation-corrosion-resistant performance of 25Cr-7Ni-Mo-N (6A) two phase stainless steel as the repair welding welding wire, the repair welding position that has guaranteed 25Cr-7Ni-Mo-N (6A) two phase stainless steel casting back defective has good anti-erosion corrosion performance and cavitation-corrosion-resistant performance, improve the service efficiency of 25Cr-7Ni-Mo-N (6A) two phase stainless steel cast member, saved a large amount of energy.
3, repair welding welding wire cost of manufacture of the present invention is low, welding process is reliable and stable, the welding position near or be better than 25Cr-7Ni-Mo-N (6A) two phase stainless steel.
4, repair welding welding wire of the present invention after testing, the ratio of its austenite and ferritic phase is near 50%, by anti-erosion corrosion and the cavitation-corrosion-resistant Performance Detection to the welding position, the performance of its anti-erosion corrosion and cavitation-corrosion-resistant quite or be better than mother metal 25Cr-7Ni-Mo-N (6A).
5, adopt repair welding welding wire of the present invention, reduced the reparation defect rate of 25Cr-7Ni-Mo-N (6A) two phase stainless steel cast member, saved the energy and resource.
6, use repair welding welding wire of the present invention, its welding procedure is simple and practical.
The specific embodiment
The present invention is a kind of repair welding welding wire that is exclusively used in two phase stainless steel 6A casting back defective, described two phase stainless steel 6A specially refers to this a kind of alloy designations of 25Cr-5Ni-Mo-Cu (1A), and described repair welding welding wire only is used for the Welding Repair of 25Cr-7Ni-Mo-N (6A) casting back defective.
The basic chemical composition of described repair welding welding wire is constructed as follows by weight percentage:
Carbon≤0.03%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-26.0%, molybdenum 3.0-3.2%, copper 0.5-0.7%, tungsten 0.5-1.0%, other unavoidable impurities and element (as phosphorus, sulphur, nickel etc.)＜0.06% and balance iron;
Also be added with in above-mentioned described basic chemical composition＞nickel of 8.5-9.0% and the nitrogen of 0.30-0.40%, the repair welding welding wire that adds nickel and nitrogen always is constructed as follows by weight percentage:
Carbon≤0.03%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-26.0%, nickel＞8.5-9.0%, nitrogen 0.30-0.40%, molybdenum 3.0-3.2%, copper 0.5-0.7%, tungsten 0.5-0.7%, other unavoidable impurities and element (as phosphorus, sulphur etc.)＜0.06% and balance iron.
The content ratio that improves nickel and nitrogen in the repair welding welding wire simultaneously from weld characteristics analyze mainly based on following some:
The one, the two phase stainless steel welding process belongs to ferrite and solidifies pattern, promptly a solidifying phase is single-phase ferrite, when weld metal is cooled to room temperature from fusing point, separate out austenite, thereby obtain two-phase structure's structure of welding position ferrite and austenite coexistence from ferrite matrix.Two phase stainless steel inappropriate welding material in welding process can cause the welding point ferrite content too high, thereby cause the embrittlement of welding position, it has been generally acknowledged that at the two phase stainless steel welding field at present keeps the austenitic advantage content in welding point position more to help improving the performance of weld seam, N, Ni is strong austenite former, the content that the repair welding material that is used for casting two phase stainless steel is new to improve nickel when adding nitrogen can guarantee that the welding position austenite is mutually easier in welding process and separate out, reaching ferritic phase and austenite proper ratio mutually, thereby guarantee the institutional framework of the two-phase coexistent that the welding position is complete.
The 2nd, add anti-spot corrosion and crevice corrosion behavior that nitrogen has improved the welding position, and nitrogen can reduce stacking fault energy and improve the work hardening rate of austenite phase in the two phase stainless steel duplex structure in the microstructure of two phase stainless steel, and it has also improved austenitic intensity by solution strengthening.
By above-mentioned total formation proportioning prepare burden the back and adopt argon-oxygen-decarburizing process (being the AOD purifying method) refining to go out repair welding welding wire ingot casting, described refining process major control be the content ratio of Cr, Ni or N, because the content ratio of Cr, Ni or N has directly determined the phase ratio at repair welding position, under normal atmospheric pressure to oxygen blown inert gas argon gas Ar and the nitrogen N of being blown into simultaneously of molten steel
2, by reducing carbon monoxide (CO) thus dividing potential drop make carbon content drop to very low level, guaranteed that the repair welding component of weld wire is in the scope of being controlled.Compound between easy precipitating metal when heating in 300 ℃ of-800 ℃ of scopes owing to 25Cr-7Ni-Mo-N (6A) two phase stainless steel cast member in addition, so forge hot when described repair welding welding wire ingot casting is heated to 950 ℃-1100 ℃, after the forge hot repair welding welding wire ingot casting is carried out the surface finish cleaning to surperficial flawless, be rolled into the repair welding welding wire pole of φ 6mm when being heated to 1000 ℃-1100 ℃ again, afterwards described repair welding welding wire pole is carried out the cold drawn of multi-pass and annealing, the final repair welding welding wire that forms φ 2mm, the mechanical property of described repair welding welding wire should satisfy:
1. fracture strength R
m(MPa) 〉=690;
2. yield strength R
P0.2(MPa) 〉=450;
3. contraction percentage of area A (%) 〉=27.
The described repair welding welding wire that satisfies mechanical property in the repair welding that is exclusively used in casting 25Cr-7Ni-Mo-N (6A) two phase stainless steel casting back defective is:
Welding current is controlled between the 136-160A, and weldingvoltage is controlled between the 22-30V, if multi-pass welding then the temperature between key-course in 150 ℃.
In conjunction with following three specific embodiments the present invention is illustrated:
Embodiment one: repair welding welding wire of the present invention always constitutes by weight percentage and sees the following form.
| Fe | Ni | N | Cr | Mo | Cu | W | C | Si | Mn | Other |
| 60.94 | 8.51 | 0.30 | 25.5 | 3.0 | 0.5 | 0.5 | 0.02 | 0.4 | 0.3 | 0.03 |
According to prepare burden back and finally formed the repair welding welding wire of φ 2mm according to above-mentioned preparation method of last table, this repair welding welding wire satisfies fracture strength, yield strength and contraction percentage of area mechanical performance index.
Concrete welding parameter sees the following form:
| Welding current (A) | Weldingvoltage (V) | Interlayer temperature (℃) |
| 140 | 25 | 90 |
A complete Welding Repair position comprises weld seam and heat affected area, usually two phase stainless steel Welding Repair position is comprised that the percentage that the ferritic phase in weld seam, heat affected area and mother metal three districts accounts for whole phases all measures, can be with the phase structure at definite Welding Repair position more fully.Adopt repair welding welding wire of the present invention after repairing 25Cr-7Ni-Mo-N (6A) two-phase stainless cast member to ferritic phase phase ratio (percentage) measurement result at Welding Repair position between 40%-60%, meet universally recognized two phase stainless steel ferritic phase proportion requirement.
| The ferrite percentage of weld metal zone, Welding Repair position | 45.22％ |
| The ferrite percentage of heat affected area, Welding Repair position | 54.27％ |
| The ferrite percentage of mother metal | 47.31％ |
Erosion corrosion speed at Welding Repair position (unit: the every square meter of milligram per hour) and cavitation damage speed (unit: per hour restrain every square meter) measurement result are shown: erosion corrosion speed and cavitation damage speed are all less than mother metal (mother metal refers to 25Cr-7Ni-Mo-N (6A) two phase stainless steel, down with) and be lower than
The upper limit of 25Cr-7Ni-Mo-N (6A) erosion corrosion speed and the upper limit of cavitation damage speed.
| Erosion corrosion speed (the mgm at Welding Repair position -2h -1) | Mother metal erosion corrosion speed (mgm -2h -1) |
| 8.01 | 8.32 |
| Cavitation damage speed (the gm at Welding Repair position -2h -1) | Mother metal cavitation damage speed (gm -2h -1) |
| 0.06 | 0.06 |
Embodiment two: repair welding welding wire of the present invention always constitutes by weight percentage and sees the following form.
| Fe | Ni | N | Cr | Mo | Cu | W | C | Si | Mn | Other |
| 59.99 | 9.0 | 0.35 | 25.7 | 3.1 | 0.6 | 0.6 | 0.02 | 0.4 | 0.4 | 0.02 |
According to prepare burden back and finally formed the repair welding welding wire of φ 2mm according to above-mentioned preparation method of last table, this repair welding welding wire satisfies fracture strength, yield strength and contraction percentage of area mechanical performance index.
Concrete welding parameter is as follows:
| Welding current (A) | Weldingvoltage (V) | Interlayer temperature (℃) |
| 140 | 25 | 100 |
A complete Welding Repair position comprises weld seam and heat affected area, usually two phase stainless steel Welding Repair position is comprised that the percentage that the ferritic phase in weld seam, heat affected area and mother metal three districts accounts for whole phases all measures, can be with the phase structure at definite Welding Repair position more fully.Adopt repair welding welding wire of the present invention after repairing 25Cr-7Ni-Mo-N (6A) two-phase stainless cast member to ferritic phase phase ratio (percentage) measurement result at Welding Repair position between 40%-60%, meet universally recognized two phase stainless steel ferritic phase proportion requirement.
| The ferrite percentage of weld metal zone, Welding Repair position | 47.77％ |
| The ferrite percentage of heat affected area, Welding Repair position | 52.15％ |
| The ferrite percentage of mother metal | 49.08％ |
To erosion corrosion speed at Welding Repair position (unit: the every square meter of milligram per hour) and the demonstration of cavitation damage speed (unit: per hour restrain every square meter) measurement result: erosion corrosion speed and cavitation damage speed are all less than mother metal and be lower than the upper limit of 25Cr-7Ni-Mo-N (6A) erosion corrosion speed and the upper limit of cavitation damage speed.
| Erosion corrosion speed (the mgm at Welding Repair position -2h -1) | Mother metal erosion corrosion speed (mgm -2h -1) |
| 6.78 | 8.67 |
| Cavitation damage speed (the gm at Welding Repair position -2h -1) | Mother metal cavitation damage speed (gm -2h -1) |
| 0.06 | 0.06 |
Embodiment three repair welding welding wires of the present invention always constitute by weight percentage and see the following form.
| Fe | Ni | N | Cr | Mo | Cu | W | C | Si | Mn | Other |
| 59.65 | 8.9 | 0.38 | 25.7 | 3.2 | 0.7 | 0.7 | 0.02 | 0.3 | 0.4 | 0.05 |
According to prepare burden back and finally formed the repair welding welding wire of φ 2mm according to above-mentioned preparation method of last table, this repair welding welding wire satisfies fracture strength, yield strength and contraction percentage of area mechanical performance index.
Concrete welding parameter is as follows:
| Welding current (A) | Weldingvoltage (V) | Interlayer temperature (℃) |
| 138 | 22 | 80 |
A complete Welding Repair position comprises weld seam and heat affected area, usually two phase stainless steel Welding Repair position is comprised that the percentage that the ferritic phase in weld seam, heat affected area and mother metal three districts accounts for whole phases all measures, can be with the phase structure at definite Welding Repair position more fully.Adopt repair welding welding wire of the present invention after repairing 25Cr-7Ni-Mo-N (6A) two-phase stainless cast member to ferritic phase phase ratio (percentage) measurement result at Welding Repair position between 40%-60%, meet universally recognized two phase stainless steel ferritic phase proportion requirement.
| The ferrite percentage at Welding Repair position | 50.20％ |
| The ferrite percentage of heat affected area, Welding Repair position | 54.11％ |
| The ferrite percentage of mother metal | 49.57％ |
To erosion corrosion speed at Welding Repair position (unit: the every square meter of milligram per hour) and the demonstration of cavitation damage speed (unit: per hour restrain every square meter) measurement result: erosion corrosion speed and cavitation damage speed are all less than mother metal and be lower than the upper limit of 25Cr-7Ni-Mo-N (6A) erosion corrosion speed and the upper limit of cavitation damage speed.
| Erosion corrosion speed (the mgm at Welding Repair position -2h -1) | Mother metal erosion corrosion speed (mgm -2h -1) |
| 4.88 | 6.16 |
| Cavitation damage speed (the gm at Welding Repair position -2h -1) | Mother metal cavitation damage speed (gm -2h -1) |
| 0.05 | 0.06 |
Claims (1)
1. one kind is used for the repair welding welding wire that two phase stainless steel 6A casts the back defective, and described two phase stainless steel 6A is meant 25Cr-7Ni-Mo-N (6A), and the basic chemical composition of this repair welding welding wire is constructed as follows by weight percentage:
Carbon≤0.03%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-26.0%, molybdenum 3.0-3.2%, copper 0.5-0.7%, tungsten 0.5-1.0%, other unavoidable impurities and element＜0.06% and balance iron;
It is characterized in that: also be added with in above-mentioned described basic chemical composition＞nickel of 8.5-9.0% and the nitrogen of 0.30-0.40%, the repair welding welding wire that adds nickel and nitrogen always is constructed as follows by weight percentage:
Carbon≤0.03%, silicon≤0.7%, manganese≤0.7%, chromium 25.0-26.0%, nickel＞8.5-9.0%, nitrogen 0.30-0.40%, molybdenum 3.0-3.2%, copper 0.5-0.7%, tungsten 0.5-0.7%, other unavoidable impurities and element＜0.06% and balance iron;
By above-mentioned total formation proportioning prepare burden the back and adopt the argon-oxygen-decarburizing process refining to go out repair welding welding wire ingot casting, described refining process is to carry out under normal atmospheric pressure and be blown into oxygen, argon gas and nitrogen, forge hot when described repair welding welding wire ingot casting is heated to 950 ℃-1100 ℃ afterwards, after the forge hot repair welding welding wire ingot casting is carried out the surface finish cleaning, be rolled into the repair welding welding wire pole of φ 6mm when being heated to 1000 ℃-1100 ℃ again, afterwards described repair welding welding wire pole is carried out the cold drawn of multi-pass and annealing, the final repair welding welding wire that forms φ 2mm, the mechanical property of described repair welding welding wire should satisfy:
1. fracture strength R
m(MPa) 〉=690;
2. yield strength R
P0.2(MPa) 〉=450;
3. contraction percentage of area A (%) 〉=27.
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| CN101972903A true CN101972903A (en) | 2011-02-16 |
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| CN113227409A (en) * | 2018-12-28 | 2021-08-06 | 日铁不锈钢株式会社 | Welded structure and method for manufacturing same |
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| CN113227409A (en) * | 2018-12-28 | 2021-08-06 | 日铁不锈钢株式会社 | Welded structure and method for manufacturing same |
| CN113500270A (en) * | 2021-06-30 | 2021-10-15 | 共享铸钢有限公司 | Welding method for surface defects of steel castings |
| CN113500270B (en) * | 2021-06-30 | 2023-03-07 | 共享铸钢有限公司 | Welding method for surface defects of steel castings |
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