CN101862924A - Gas shield welding wire material for supercritical steel - Google Patents
Gas shield welding wire material for supercritical steel Download PDFInfo
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Abstract
The invention relates to a gas shield welding wire material for supercritical steel, which is characterized by being prepared from the following raw materials in percentage by weight: 0.09%-0.12% of carbon (C), 0.5%-0.8% of manganese (Mn), 0.20%-0.30% of silicon (Si), less than or equal to 0.010% of sulfur (S), less than or equal to 0.010% of phosphorus (P), 8.5%-10.0% of chromium (Cr), 0.18%-0.25% of vanadium (V), 0.6%-0.8% of nickel (Ni), 0.9%-1.1% of molybdenum (Mo), 0.05%-0.08% of niobium (Nb), less than or equal to 0.20% of copper (Cu), 0.03%-0.06% of nitrogen (N), less than or equal to 0.04% of aluminum (Al), and the balance of Fe. A welding line of the invention has good combination property. Compared with the prior art, the invention has high strength, good toughness, and the like and achieves the following requirements on the mechanical property of deposited metal (a heat treatment condition: 740+/-10 DEG C*4 h): sigma b(MPa) is more than or equal to 620; sigma 0.2 (MPa) is more than or equal to 530; delta 5 (%) is more than or equal to 17; psi (%) is more than or equal to 40; Akv2 (J): 47/38 is equal to a mean value/a minimum value; and rigidity (HV) is less than or equal to 350.
Description
Technical field
The present invention relates to a kind of gas shield welding wire material, relate to a kind of 1Cr10MoVNbN gas shield welding wire material for supercritical steel specifically.
Background technology
Along with developing rapidly of power industry, jumbo high temperature, high pressure unit continue to bring out, and have progressively eliminated the medium temperature and medium pressure unit.To 2000 the end of the year whole nation have 66 of the thermal power plants of 1000MW and above installed capacity, the existing big unit capacity of thermoelectricity in the whole nation is 192 of 200～210MW, 180 of 250～300MW, 56 of 320～362.5MW, 30 of 500～660MW, 2 of 800MW, big unit has become main force's unit of Chinese thermal power generation.Construction of fire and electricity in 2008 continues to develop towards big unit, big capacity, water-saving and environmental protection type direction, 2 in Waigaoqiao of Shaihai power plant, Taizhou, Jiangsu power plant 1 gigawatt ultra supercritical unit put into operation in succession, make the whole nation reach 10 at fortune gigawatt ultra supercritical unit, first the gigawatt Air-cooled Unit in the world also puts into operation in Ningxia.
Facts have proved that improve boiler steam temperature and pressure parameter and be one of effective method that improves thermal power generation efficient, particularly temperature is more remarkable to the influence of efficient.Increase steam pressure and then require the steel that use high temperature strength higher, otherwise the wall thickness of member is increased exponentially; Increase vapor (steam) temperature then inevitable requirement steel can keep high intensity under higher temperature.As seen the development of power technology depends on the development of material technology level to a great extent.Comply with this requirement, since the eighties in 20th century, states such as U.S., moral, method, day develop a series of steam parameters that are applicable to and reach 600 ℃/610 ℃, the ferrite refractory steel of 25MPa and the martensite heat-resistance stainless steel (T91/P91 that vapor (steam) temperature reaches 625 ℃, T92/P92, T122/P122, Super304H, T23/P23).The material of first-selection when they have been newly-built big capacity Subcritical Units of China and supercritical unit.The power station needs the very long cycle with the exploitation of steel, and HTHP effective steel in China power station are continued to use external ripe steel grade mostly since the establishment of the nation, and practice at home and abroad proof 12Cr1MoV, 2.25Cr-Mo, steel processing performances such as TP304, TP347 are good, reliable.But in order to improve vapor (steam) temperature and pressure, various countries after the sixties in 20th century (also comprising China) are devoted to develop serviceability temperature one after another and are higher than 580 ℃ of steel grades that are lower than 650 ℃.The nineteen eighty-three U.S. ORNL when T91/P91 steel of release has the following mechanical behavior under high temperature of good normal temperature and 610 ℃, also has good process industrial art performance after spending 8 years the 9Cr1Mo steel to be carried out improve.
We can say that succeeding in developing of T91/P91 steel is the breakthrough of power station with effort in nearly 30 years in the rings territory.China began to introduce this steel of use in 1987, more existing units have grasped the welding procedure of T91/P91 steel substantially over more than 10 year, have also carried out T91 and steel 102,12Cr1MoV, the work of TP304 steel dissimilar steel Study of Welding simultaneously.Change superheater that steel 102 makes and the reliability of high temperature reheater operation obviously improves with T91.It has filled up the vacancy between low-alloy steel pearlite heatproof steel and the high alloy austenitic heat-resistance steel.China progressively uses the material of P91 steel as power station main steam line and hot arc reheaing steam pipe since the beginning of the nineties, as Lopa Nationality semi-annular jade pendant power plant, duck river mouth power plant, the solid steam power plant in west, the blue or green power plant of willow, peak, Handan power plant etc.Its pipe thickness of steam pipe made from P91 can reduce exponentially.
P91 steel welding material and relevant welding procedure thereof are key technologies overcritical, that super (surpassing) critical unit is made.
Summary of the invention
Purpose of the present invention provides a kind of 1Cr10MoVNbN gas shield welding wire material for supercritical steel just at above-mentioned prior art requirement.Welding wire of the present invention adopts the external refining method to smelt making, and promptly the VOD method is carried out application of vacuum to molten steel, add the stirring action of argon gas, the dynamic conditions of reaction is very favourable, can obtain the good effect of degassing, going field trash, is applicable to automatic weldering and semiautomatic welding.
Gas shield welding wire material for supercritical steel of the present invention is to be prepared from by following (concrete chemical composition) raw materials by weight percent, wherein: carbon C:0.09-0.12%; Manganese Mn:0.5-0.8%; Silicon Si:0.20-0.30%; Sulphur S :≤0.010%; Phosphorus P :≤0.010%; Chromium Cr:8.5-10.0%; Vanadium V:0.18-0.25%; Nickel: 0.6-0.8%; Molybdenum Mo:0.9-1.1%; Niobium Nb:0.05-0.08%; Copper Cu :≤0.20%; Nitrogen N:0.03-0.06%; Aluminium Al :≤0.04%; Surplus is iron Fe.
The preferred weight percent of raw material of the present invention is: carbon C:0.09-0.12%; Manganese Mn:0.5-0.8%; Silicon Si:0.20-0.30%; Sulphur S:0.003-0.010%; Phosphorus P:0.004-0.010%; Chromium Cr:8.5-10.0%; Vanadium V:0.18-0.25%; Nickel: 0.6-0.8%; Molybdenum Mo:0.9-1.1%; Niobium Nb:0.05-0.08%; Copper Cu:0.02-0.10%; Nitrogen N:0.03-0.06%; Aluminium Al:0.006-0.01%; Surplus is iron Fe.
The preparation method of gas shield welding wire material for supercritical steel of the present invention can adopt the smelting process of prior art: specifically; get needed raw material by weight percentage; ingot casting after vacuum drying oven is smelted; again through forge, technologies such as rolling, dish unit and wire drawing make the finished product welding wire, gage of wire can be drawn into the welding wire of 1.2mm or 1.6mm as required.
The effect of each alloying element that overcritical gas protection wire of the present invention added is as follows:
Niobium Nb: when niobium Nb content reduces to the contents level that is lower than mother metal (it is 0.06～0.1% that the regulation of mother metal contains niobium Nb amount), can improve the toughness of weld metal effectively, but in order not sacrifice the creep-resistant property of tissue, 0.04～0.08% is considered to the optimum range of niobium Nb;
Nickel: the adding of nickel helps improving the impact flexibility of weld seam.This mainly is because nickel can reduce the AC1 temperature of material, thereby improves the extent of reaction of tissue to temperature.Nickel can also reduce the sensitiveness that delta ferrite forms simultaneously, and the performance that has the butt welded seam metal of delta ferrite is harmful to.But too high nickel content＞1.0% item can too reduce the AC1 temperature of weld metal, makes its temperature that may be lower than post weld heat treatment, and this will cause cooling off the generation of the new not tempered martensite in back.Too high nickel content also can influence the creep-resistant property of material, and therefore, the nickel content of weld seam generally is controlled between 0.4～1.0%, but also has indivedual mechanisms to require nickel content must be lower than 0.4%, and is promptly consistent with the nickel content of mother metal.Analysis-by-synthesis designs nickel content between 0.6～0.8;
Manganese Mn: it is generally acknowledged, thereby suitably higher than mother metal manganese Mn can promote the deoxidation of weld seam to guarantee the weight of weld metal.But the total content that some mechanism then limits manganese Mn+ nickel in the weld metal is no more than 1.5%, does not even surpass 1.0%, to avoid forming austenite again under the highest post weld heat treatment temperature.Analysis-by-synthesis designs manganese Mn content between 0.5～0.8%;
Silicon Si: silicon Si is a kind of important deoxidier, and can also improve the antioxygenic property of alloy when existing simultaneously with chromium Cr.Suitably low silicon Si content then helps improving the toughness of weld metal.Therefore, according to some early stage results of study, the silicon Si content of some technical standard order weld seams of the U.S. must be lower than 0.30% (promptly being lower than 0.20～0.50% scope of mother metal).Analysis-by-synthesis designs silicon Si content between 0.2～0.3;
Vanadium V, carbon C, nitrogen N: these elements all have the less influence of degree to toughness.Generally speaking, except cause the situation of delta ferrite formation because incorrect chemical composition forms, the vanadium V of weld seam, carbon C, nitrogen N content all are controlled at and the identical level of P91 steel mother metal, to guarantee best weld metal croop property.
Sulphur S, phosphorus P: by the content of impurity element in the strict control of the mode welding wire of refining, can obviously reduce the sensitiveness of weld crack, according to actual smelting condition, sulphur S is controlled in 0.01, phosphorus P is controlled in 0.010.
Simultaneously, the high impact flexibility that can significantly reduce P91 steel weld seam of nonmetalloid in the weld seam such as oxygen content.Need strict control, oxygen is controlled in 0.01.Adopt vacuum VOD method can effectively control gas content.
Beneficial effect of the present invention is as follows:
Weld seam of the present invention has good comprehensive performances, particularly has very high strength, but hardness is not high.Its combination property is: σ b 〉=620MPa; σ 0.2 〉=530MPa; δ (%) 〉=17; Akv2 (J): 47/38 mean value/minimum; Hardness (HV)≤350.
The specific embodiment
The present invention is described in further detail below with reference to embodiment, but does not limit the present invention.
Embodiment 1
Present embodiment is the T/P91 gas protection wire for steel, and its deposited metal composition and content are (percentage by weight), wherein: carbon (C): 0.10%; Silicon (Si): 0.20%; Manganese (Mn): 0.51%; Phosphorus (P): 0.009%; Sulphur (S): 0.008%; Chromium (Cr): 9.06%; Nickel (Ni): 0.71%; Molybdenum (Mo): 0.95%; Vanadium (V): 0.23%; Aluminium (Al): 0.008%; Niobium (Nb): 0.06%; Nitrogen (N): 0.06%; Copper (Cu): 0.08%; Surplus is iron (Fe);
The preparation method of present embodiment following (prior art processes): get needed raw material by above-mentioned percentage by weight and prepare burden, ingot casting after vacuum drying oven is smelted, again through forge, technologies such as rolling, dish unit and wire drawing make the finished product welding wire, gage of wire can be drawn into the welding wire of 1.2mm or 1.6mm as required.
Welding of the welding wire deposited metal test plate (panel) of present embodiment and mechanical property experiment are all carried out according to GB/T8110-1995 " gas shielded arc welding with carbon steel, low alloy steel welding wire standard ".The test plate (panel) material is selected foundry goods test plate (panel) GX12CrMoVNbN9-1 for use, gage of wire Φ 1.2, and welding current 200-280A, weldingvoltage 22-30V adopts Ar+CO
2Gas shielded arc welding, flow-control are at 20-25 (l/min), and weldering speed is 32cm/min approximately, and layer temperature control is at 150 ℃, and the postwelding test plate (panel) was through post weld heat treatment in 740 ± 10 ℃, 10 hours.Welding back deposited metal performance sees Table one.
Table one embodiment one welding wire deposited metal mechanical property
| ??σb??(MPa) | ??σ0.2??(MPa) | ??δ??5(％) | ??ψ(％) | Weld seam Akv (J) | Weld seam HB | The heat affected area |
| ??825 | ??750 | ??18 | ??63 | ??94；92；??110； | ??295；295；??295 | ??302；302；??302 |
Embodiment 2
Present embodiment is the T/P91 gas protection wire for steel, and its deposited metal composition and content are (percentage by weight), wherein: carbon (C): 0.115; Silicon (Si): 0.20%; Manganese (Mn): 0.60%; Phosphorus (P): 0.009%; Sulphur (S): 0.009%; Chromium (Cr): 8.50%; Nickel (Ni): 0.60%; Molybdenum (Mo): 1.05%; Vanadium (V): 0.20%; Aluminium (Al): 0.007%; Niobium (Nb): 0.05%; Nitrogen (N): 0.03%; Copper (Cu): 0.04%; Surplus is iron (Fe);
The preparation method of present embodiment is same as embodiment 1.
Embodiment of the invention welding wire deposited metal test plate (panel) welding and mechanical property experiment are all carried out according to GB/T8110-1995 " gas shielded arc welding with carbon steel, low alloy steel welding wire standard ".The test plate (panel) material is selected foundry goods test plate (panel) GX12CrMoVNbN9-1 for use, gage of wire Φ 1.2, and welding current 200-280A, weldingvoltage 22-30V adopts Ar+CO
2Gas shielded arc welding, flow-control be at 20-25 (l/min), and weldering speed is 32cm/min approximately, and layer temperature control be at 150 ℃, 750 ℃ * 4h post weld heat treatment.Welding back deposited metal performance sees Table two.
Table two embodiment two welding wire deposited metal mechanical properties
| ??σb??(MPa) | ??σ0.2??(MPa) | ??δ??5(％) | ??ψ(％) | Weld seam Akv (J) | Weld seam HB | The heat affected area |
| ??820 | ??715 | ??18 | ??62 | ??64、62、??39 | ??222、219、??224 | ??266、266、??266 |
Embodiment 3
Present embodiment is the T/P91 gas protection wire for steel, and its deposited metal composition and content are (percentage by weight), wherein: carbon (C): 0.11; Silicon (Si): 0.25; Manganese (Mn): 0.65; Phosphorus (P): 0.009; Sulphur (S): 0.009; Chromium (Cr): 10.0; Nickel (Ni): 0.74; Molybdenum (Mo): 1.10; Vanadium (V): 0.23; Aluminium (Al): 0.008; Niobium (Nb): 0.05; Nitrogen (N): 0.03; Copper (Cu): 0.03; Surplus is iron (Fe);
The preparation method of present embodiment is same as embodiment 1.
Embodiment of the invention welding wire deposited metal test plate (panel) welding and mechanical property experiment are all carried out according to GB/T8110-1995 " gas shielded arc welding with carbon steel, low alloy steel welding wire standard ".The test plate (panel) material is selected foundry goods test plate (panel) GX12CrMoVNbN9-1 for use, gage of wire Φ 1.2, and welding current 200-280A, weldingvoltage 22-30V adopts Ar+CO
2Gas shielded arc welding, flow-control be at 20-25 (l/min), and weldering speed is 32cm/min approximately, and layer temperature control be at 150 ℃, 750 ℃ * 4h post weld heat treatment.Welding back deposited metal performance sees Table three.
Table three embodiment three welding wire deposited metal mechanical properties
| ??σb??(MPa) | ??σ0.2??(MPa) | ??δ??5(％) | ??ψ(％) | Weld seam Akv (J) | Weld seam HB | The heat affected area |
| ??765 | ??635 | ??19 | ??65 | ??80、64、??84 | ??219、223、??223 | ??250、240、??249 |
Embodiment 4
Present embodiment is the T/P91 gas protection wire for steel, and its deposited metal composition and content are (percentage by weight), wherein: carbon (C): 0.12%; Silicon (Si): 0.30%; Manganese (Mn): 0.80%; Phosphorus (P): 0.009%; Sulphur (S): 0.01%; Chromium (Cr): 9.1%; Nickel (Ni): 0.80%; Molybdenum (Mo): 1.00%; Vanadium (V): 0.25%; Aluminium (Al): 0.01%; Niobium (Nb): 0.08%; Nitrogen (N): 0.03%; Copper (Cu): 0.06%; Surplus is iron (Fe);
The preparation method of present embodiment is same as embodiment 1.
Embodiment of the invention welding wire deposited metal test plate (panel) welding and mechanical property experiment are all carried out according to GB/T8110-1995 " gas shielded arc welding with carbon steel, low alloy steel welding wire standard ".The test plate (panel) material is selected foundry goods test plate (panel) GX12CrMoVNbN9-1 for use, gage of wire Φ 1.2, and welding current 200-280A, weldingvoltage 22-30V adopts Ar+CO
2Gas shielded arc welding, flow-control be at 20-25 (l/min), and weldering speed is 32cm/min approximately, and layer temperature control be at 150 ℃, 750 ℃ * 4h post weld heat treatment.Welding back deposited metal performance sees Table four.
Table four embodiment four welding wire deposited metal mechanical properties
| ??σb??(MPa) | ??σ0.2??(MPa) | ??δ??5(％) | ??ψ(％) | Weld seam Akv (J) | Weld seam HB | The heat affected area |
| ??705 | ??515 | ??23 | ??68 | ??62、64、??48 | ??219、222、??222 | ??232、234、??234 |
Table five is the composition of welding test plate (panel), and table six is the mechanical property of welding test plate (panel).
The chemical composition (%) of table five welding test plate (panel)
| ??C | ??Si | ??M??n | ??P | ??S | ??Cr | ??Ni | ??M??o | ??V | ??Al | ??Nb | ??N | ??C??u | ??Ti | ??Sn | ??B |
| ??0.1??26 | ??0.??33 | ??0.??58 | ??0.0??09 | ??0.0??01 | ??8.??50 | ??0.??21 | ??1.??0 | ??0.??21 | ??0.0??07 | ??0.0??62 | ??0.05??26 | ??0.??02 | ??0.0??17 | ??0.0??03 | ??0.00??01 |
The mechanical property of table six welding test plate (panel)
| Project | ??σb??(MPa) | ??σ0.2??(MPa) | ??δ5(％) | ??ψ(％) | ??Akv(J) | ?HB |
| Measured value | ??715 | ??580 | ??20 | ??68.5 | ??46；62；59； | ?229；229；229 |
Can find out according to above-mentioned cited embodiment and welding result, adopt embodiment of the invention gas protection wire all can obtain higher intensity and toughness, through evidence; this welding wire process function admirable, welding arc stablility, it is little to splash; it is attractive in appearance to be shaped, advantages such as pore-free.
Claims (2)
1. gas shield welding wire material for supercritical steel, it is characterized in that: described solder wire material is to be prepared from by following weight percentages, wherein: carbon C:0.09-0.12%; Manganese Mn:0.5-0.8%; Silicon Si:0.20-0.30%; Sulphur S :≤0.010%; Phosphorus P :≤0.010%; Chromium Cr:8.5-10.0%; Vanadium V:0.18-0.25%; Nickel: 0.6-0.8%; Molybdenum Mo:0.9-1.1%; Niobium Nb:0.05-0.08%; Copper Cu :≤0.20%; Nitrogen N:0.03-0.06%; Aluminium Al :≤0.04%; Surplus is iron Fe.
2. gas shield welding wire material for supercritical steel according to claim 1 is characterized in that: the preferred weight percent of described raw material is: carbon C:0.09-0.12%; Manganese Mn:0.5-0.8%; Silicon Si:0.20-0.30%; Sulphur S:0.003-0.010%; Phosphorus P:0.004-0.010%; Chromium Cr:8.5-10.0%; Vanadium V:0.18-0.25%; Nickel: 0.6-0.8%; Molybdenum Mo:0.9-1.1%; Niobium Nb:0.05-0.08%; Copper Cu:0.02-0.10%; Nitrogen N:0.03-0.06%; Aluminium Al:0.006-0.01%; Surplus is iron Fe.
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| CN102383025A (en) * | 2011-10-13 | 2012-03-21 | 中核苏阀横店机械有限公司 | Preparation method of super-critical high alloy steel suitable for thermal power unit |
| CN105312793A (en) * | 2014-07-29 | 2016-02-10 | 中国科学院金属研究所 | Fe-Ni based high-temperature alloy welding wire for high-temperature component for 700 DEG C ultra-supercritical thermal power and application of Fe-Ni based high-temperature alloy welding wire |
| CN105728978A (en) * | 2014-12-25 | 2016-07-06 | 株式会社神户制钢所 | Wire for gas shield arc welding |
| CN106425157A (en) * | 2016-10-28 | 2017-02-22 | 四川大西洋焊接材料股份有限公司 | TIG welding wire of steel for steam temperature ultra supercritical thermal power generating unit and preparation method thereof |
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| WO2019047793A1 (en) * | 2017-09-11 | 2019-03-14 | 武汉大学 | Super304h steel welding wire resistant to high-temperature creep and aging brittleness |
| US11446773B2 (en) | 2017-09-11 | 2022-09-20 | Wuhan University | Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement |
| CN110549031A (en) * | 2018-05-31 | 2019-12-10 | 上海电气电站设备有限公司 | High-heat-strength welding wire for dissimilar steel welding joint |
| CN109277724A (en) * | 2018-11-09 | 2019-01-29 | 鞍钢股份有限公司 | A kind of plug local route repair gas shield welding wire and welding procedure |
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Application publication date: 20101020 |