CN103008917B - Ultra-supercritical novel ferrite heat-resistant steel welding electrode - Google Patents
Ultra-supercritical novel ferrite heat-resistant steel welding electrode Download PDFInfo
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Abstract
The invention discloses an ultra-supercritical novel ferrite heat-resistant steel welding electrode, consisting of an H08Cr9WMo special core wire and a coating, wherein the content of each of sulfur, phosphorous, arsenic, stannum and the like in the H08Cr9WMo special core wire is low; the coating is wrapped on the surface of the core wire; and the covering components and the mass contents thereof are as follows: 28-40% of marble, 18-28% of fluorite, 5-10% of rutile, 3-8% of ferrotitanium, 4-10% of silica powder, 2-5% of silicoferrite, 1-1.8% of ferrovanadium, 0.4-0.8% of ferrocolumbium, 1-1.8% of nickel powder, 0.4-0.8% of sodium carbonate, 0.4-0.8% of CMC (Carboxymethyl Cellulose), 0.2-0.6% of amorphous graphite powder, 0.6-1.5% of ferrochrome nitride and 1.5-3% of electrolytic manganese. The welding electrode provided by the invention is used for the welding of ultra-supercritical heat-resistant steel T/P92 in a matching way; and in the course of welding, the electric arc is stable, the splashing is little, the slag detachability is good, the all-position operability is good, the formed welding line is attractive and the welding line wettability is moderate.
Description
Technical field
The present invention relates to a kind of welding rod, particularly a kind of ultra supercritical Novel iron ferritic heat resistant steel electrode.
Background technology
In order to improve the thermal efficiency, reduce CO2 discharge capacity, the requirement of conform protection and economize energy, the various energy-saving and environmental protection product such as ultra-supercritical boiler, recirculating fluidized bed is all being greatly developed in countries in the world, and China is no exception.In developed country, power station unit is essentially towards Large Copacity and high parameter future development, and to reduce energy consumption, to improve for the purpose of the thermal efficiency, the extra-supercritical unit of high capacity highly effective rate is in succession produced and puts into operation; Through constantly improving development, the availability of extra-supercritical unit, flexibility and operational reliability have all reached quite high level.
Super-supercritical technique Ye Shi China thermoelectricity realizes the inevitable approach of low-carbon electric power.From 2003, generating equipment manufacturing enterprise of China cooperated with foreign-made business, introduced large and super-critical fired power generating unit technology.The large power group in Shanghai, Harbin and east three has introduced supercritical technology from Siemens, Mitsubishi and Hitachi, Ltd etc. respectively.By the end of the year 2010, reached 33 at the 1000MW extra-supercritical unit run, Chinese having become has the maximum country of extra-supercritical unit in the world, is also that ultra supercritical wlding consumes big country.
The supporting welding rod of ultra supercritical on existing market, from abroad introducing, cost is high, the cycle is long on the one hand, there is arc stability difference in various degree on the other hand during welding rod welding, blow force of arc is little, and spatter is large, and welding bead is narrow, the disadvantages such as appearance of weld is poor, and deslag performance is bad.And be difficult to make welding technological properties and mechanical performance reach best simultaneously.Welding rod of the present invention solves above difficult point, not only has good processing performance, and has good 100,000 hours creep rupture strengths and high temperature creep property.
Summary of the invention
For above-mentioned weak point, an object of the present invention is just to provide a kind of ultra supercritical Novel iron ferritic heat resistant steel electrode, this ultra supercritical Novel iron ferritic heat resistant steel electrode is supporting for welding ultra supercritical heat resisting steel T/P92, during welding, arc stability, splashing are less, the removability of slag is good, all positon good operability, appearance of weld are attractive in appearance, and weld seam wellability is moderate.
Technical scheme is: a kind of ultra supercritical Novel iron ferritic heat resistant steel electrode, and the H08Cr9WMo special core wire low by sulphur phosphorus arsenic tin equal size and the coating wrapped in core wire surface form, and described coating component and mass content thereof are:
Marble 28 ~ 40%;
Fluorite 18 ~ 28%;
Rutile 5 ~ 10%;
Ferrotianium 3 ~ 8%;
Silicon powder 4 ~ 10%;
Ferrosilicon 2 ~ 5%;
Vanadium iron 1 ~ 1.8%;
Ferro-niobium 0.4 ~ 0.8%;
Nickel powder 1 ~ 1.8%;
Soda ash 0.4 ~ 0.8%;
CMC?0.4～0.8％；
Amorphous graphite 0.2 ~ 0.6%;
Nitrided ferro-chromium 0.6 ~ 1.5%;
Electrolytic manganese 1.5 ~ 3%.
As preferably, described H08Cr9WMo special core wire chemical composition mass percent is:
C:≤0.05％；
Mn:0.30-0.60％；
Si:≤0.15％；
S:≤0.006％；
P:≤0.006％；
Cr:8.50-10.0％；
Ni:≤0.20％；
Mo:0.50-0.70％；
W:1.40-1.90％；
Nb:≤0.07％；
N:≤0.07％；
Al:≤0.025％；
Cu:≤0.10％；
As:≤0.006％；
Surplus is Fe.
As preferably, described compositions of surfacing metal weight consists of:
Marble 30%, fluorite 25%, electrolytic manganese 2.2%, ferrosilicon 2.2%, silicon powder 5%, nickel powder 1.4%, ferro-niobium 0.5%, amorphous graphite 0.4%, ferrotianium 5%, soda ash 0.8%, CMC0.6%, vanadium iron 1.3%, nitrided ferro-chromium 1.2% and rutile 7%.
As preferably, described compositions of surfacing metal weight consists of:
Marble 33%, fluorite 22%, electrolytic manganese 2.1%, ferrosilicon 2.2%, silicon powder 6%, nickel powder 1.5%, ferro-niobium 0.5%, amorphous graphite 0.4%, ferrotianium 5%, soda ash 0.8%, CMC0.6%, vanadium iron 1.2%, nitrided ferro-chromium 1.1% and rutile 6.8%.
As preferably, described compositions of surfacing metal weight consists of:
Marble: 32%, fluorite: 25%, electrolytic manganese: 2.0%, ferrosilicon: 2.2%, silicon powder: 5.5%, nickel powder: 1.5%, ferro-niobium: 0.45%, amorphous graphite: 0.4%, ferrotianium: 5%, soda ash: 0.8%, CMC:0.6%, vanadium iron: 1.2%, nitrided ferro-chromium: 1.0% and rutile 6.5%.
Two of object of the present invention is the production method providing a kind of above-mentioned ultra supercritical Novel iron ferritic heat resistant steel electrode.
Technical scheme is: a kind of production method manufacturing above-mentioned ultra supercritical Novel iron ferritic heat resistant steel electrode, the step adopted is: after being mixed by each for described coating composition, adding weight is again that the binding agent of the 18-25% of coating weight stirs, then send in plodder and be wrapped on described core wire, then bake and bank up with earth and 350-380 DEG C of high-temperature bake through 80-100 DEG C of low temperature.
As preferably, described binding agent is sodium silicate, KP1 or potassium-sodium water glass.
Inventive principle of the present invention:
Binding agent is sodium silicate or KP1 or potassium-sodium water glass.
CaCO
3be marmorean main constituent, the marble used in welding rod, under the effect of arc heat, resolves into CaO and CO
2gas, plays the effect of slag making and gas making, and CaO is basic anhydride, can improve slag basicity, stable arc, increases interfacial tension and the surface tension of slag and metal surface, improves deslag performance, and has de-S ability preferably, CO
2the hydrogen dividing potential drop in arc atmosphere can be reduced, reduce weld hydrogen content.But CaCO
3too many meeting alligatoring molten drop, so control marble 28 ~ 40% in the present invention.
CaF
2be the Main Ingredients and Appearance of fluorite, be a kind of polygene mineral matter, belong to alkaline fluoride, be a kind of slag former in welding rod, diluent dehydrogenation effect can be played, CaF
2under welding arc effect, ionize out F-, the dividing potential drop of hydrogen in arc atmosphere can be reduced, there is the effect same with carbonate facics.CaF
2resolution reduce the content of oxygen in deposited metal, be conducive to the Low temperature impact toughness improving weld metal, CaF
2fusing point is lower, can effectively reduce cinder high-temperature viscosity, improve slag fluidity, and improve electric conductivity, improve appearance of weld, and to improving welding procedure, improving deposited metal mechanical performance has very large effect, rational CaF
2content can play the effect of stable arc, if CaF
2too high then arc stability is deteriorated, and slag is hardening.In this invention, test proves CaF
2better effects is had when 18-28%.
Rutile is purer titanium dioxide, TiO
2be acidic oxide, the physical property of slag can be improved, long slag is become short slag, make slag variation with temperature fast, make appearance of weld good, improve the removability of slag, adding fashionable overall control 5 ~ 10%.
Cr mono-aspect makes in steel higher containing Cr amount, easily forms Cr
2o
3oxide-film, makes material have excellent anti-normal temperature, high temperature oxidation resistance, improves decay resistance; M can be formed on the other hand
23c
6type carbide, good carbide reinforced effect is played in matrix, play solution strengthening effect, increasing Cr content can make creep fracture time lengthen, but delta ferrite is easy to residual, suitably the content of control Cr, makes Creq≤10 (Creq=Cr+6Si+4Mo+1.5W+11V+5Nb+9Ti+12Al-40C-30N-4Ni-2Mn-1C u), then there will not be δ-Fe, be conducive to obtaining single martensitic structure.In order to match with T/P91 mother metal and obtain good mechanical performance, in the present invention, deposited metal Cr content is controlled 8.50 ~ 10.50%.
Ni adds the impact flexibility being conducive to improving weld seam, and mainly Ni can reduce the Ac of material
1temperature, improves the extent of reaction of tissue to tempering, reduces the sensitiveness that delta ferrite is formed simultaneously.According to data introduction: there is a γ-α to change in Fe-Cr-Nb-Ni system, because the matrix containing Ni alloy is the granular ferrite changed by γ-α, temperature raise until 600 DEG C time, the intensity of alloy is strongly depend on the subgrain structure of ferrite matrix, when Nb content is identical, do not present higher intensity containing Ni containing Ni alloy ratio.But nickel element and manganese element content have exceeded the toughness that mother metal set upper limit can improve it significantly, because they are to Ac
1the impact of temperature, must consider again to limit its content.In the present invention, Ni is controlled 1 ~ 1.8%.
The acting body of N is now both ways: play solution strengthening effect on the one hand, but under normal temperature, the solubility of nitrogen in steel is very little; On the other hand, in heat treatment process, playing dispersion-strengtherning by successively occurring that V (C, N) separates out, substantially increasing creep rupture strength value, but its plasticity and toughness can be reduced.In the present invention, nitrided ferro-chromium is controlled 0.6 ~ 1.5%.
Mo is mainly solution strengthening, and also participate in forming precipitation strength, can significantly improve creep limit and the stress-rupture strength limit of steel, Mo can also make recrystallization temperature significantly raise, and recovery temperature is after deformation significantly improved; And the temperature range of 450 DEG C-650 DEG C, effectively can suppress the gathering of cementite, and promote that the alloy carbide of disperse is separated out, but add Mo too much, the brittle failure of steel can be strengthened.In the present invention, deposited metal Mo content is controlled 0.30 ~ 0.70%.
Nb is carbide, stable carbide NbC can be formed, this carbide is very stable, it can improve creep limit and the creep rupture strength of steel, when particularly V and Nb compound adds, effect is more obvious, and Nb can improve the heat resistance of steel is in addition owing to forming stable carbide NbC and Laves (NbFe
2), dispersion-strengtherning is better.But the increase along with Nb content can cause the reduction of percentage elongation, and this is due to NbFe
2volume ratio increase and cause, too high Nb content significantly reduces the toughness of weld metal.Take into account creep rupture strength and impact flexibility.In the present invention, Nb-Fe is controlled 0.4 ~ 0.8%.
Even if the carbide that V is formed in heat resisting steel at higher operating temperatures, also compare and be difficult to assemble, this provides for improved the heat resistance of steel, adding of V obviously can reduce creep speed.Compound adds V, Nb and easily forms the stable MX carbide of very thin disperse and produce precipitation strength (the most effective with 0.25%V-0.05%Nb combination), very large on creep rupture strength impact, and have adverse effect to welding performance (fire check) and toughness, therefore their content must control in the lower scope of specification permission.In the present invention, V-Fe is controlled 1 ~ 1.8%.
Mn, Si add as deoxidier, and for avoiding again forming austenite at the highest post weld heat treatment temperature, in weld metal, Mn+Si should control in the upper limit is the scope of 1.5%.When Si and Cr exists simultaneously, heavy alloyed high-temperature oxidation resistance can be carried, but the too high toughness being unfavorable for weld metal of Si.In the present invention, Si-Fe is controlled, 2 ~ 5%, electrolytic manganese to be controlled 1.5 ~ 3%.
C is that one can effectively control delta ferrite forming element, adds C the intensity of steel can be made to improve in steel, and plasticity reduces.For ensureing welding processing, carbon content remains on a lower level.In the present invention, amorphous graphite is controlled 0.2 ~ 0.6%.
In addition, in order to meet the removability of slag of weld seam, deoxidation, the requirement such as appearance of weld and good mechanical performance, the present invention have selected Si, Mn combined deoxidation, and adding of manganese can improve intensity and toughness, also be a kind of well desulfurizing agent, adding of Ca also has good effect to dephosphorization, and each composition Proper Match in welding rod, serves good effect to the mechanical performance of weld structure and weld seam.
Beneficial effect of the present invention is: the supporting welding rod of the external corresponding ultra supercritical heat resisting steel introduced adopts core wire different, and there is arc stability difference in various degree during welding, blow force of arc is little, spatter is large, the disadvantages such as welding bead is narrow, and appearance of weld is poor, and deslag performance is bad.And be difficult to make welding technological properties and mechanical performance reach best simultaneously.Welding rod of the present invention solves above difficult point, not only has good processing performance, and has good 100,000 hours creep rupture strengths and high temperature creep property.
The present invention obtains full martensitic structure (hardly containing delta ferrite) to composition Proper Match each in welding rod after making weld(ing) deposit quench, through-temper of quenching, microscopic structure is the tempered sorbite of Mo solution strengthening, and matrix contains the M that tempering is separated out
23c
6carbon/the nitride of V and Nb that metalloid carbide (carbide of Fe, Cr or Mo) and MX form exist, M
2x and Laves phase, in welding rod, each composition Proper Match serves good action to the mechanical performance improving weld structure and weld seam, obtains the weld metal of excellent high temperature creep property and 100,000 hours creep rupture strengths.For the production of its Weld Performance of heat resisting steel be: welding point tensile strength 650 ~ 730Mpa, yield strength 550 ~ 630Mpa, percentage elongation 19 ~ 25%, 20 DEG C of Impact energy Ak v >=67J, and after welding, weld porosity, slag inclusion, crackle, diffusible hydrogen and outward appearance edge etc. meet the requirement of ultra supercritical heat resisting steel properties of weld all completely.
When adopting the welding rod welding T/P92 heat resisting steel of the present invention's protection; by using reasonable welding procedure and Technology for Heating Processing; the chemical composition of weld metal and tissue can be made to reach best; there is rational hot strength (750MPa), impact value (78J, 81J, 96J, 110J, 88J), 100,000 hours creep rupture strengths (625 DEG C; the mechanical performance index such as 117.8MPa), and after welding, weld porosity, slag inclusion, crackle, diffusible hydrogen and outward appearance edge etc. meet the requirement of ultra supercritical heat resisting steel properties of weld all completely.
The welding rod of the present invention's protection can also be applicable to the welding of the ultra supercritical heat resisting steel 100,000 hours creep rupture strengths and high temperature creep property being had to requirement.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
To get it filled skin, each component of coating and mass fraction as follows: marble: 30%, fluorite: 25%, electrolytic manganese: 2.2%, ferrosilicon: 2.2%, silicon powder: 5%, nickel powder: 1.4%, ferro-niobium: 0.5%, amorphous graphite: 0.4%, ferrotianium: 5%, soda ash: 0.8%, CMC:0.6%, vanadium iron: 1.3%, nitrided ferro-chromium: 1.2%, rutile 7%.
Get core wire, the special core wire of H08Cr9WMo that sulphur phosphorus arsenic tin equal size is low selected by core wire, and chemical composition mass percent is: C:0.04; Mn:0.43; Si:0.04; S:0.005; P:0.005; Cr:9.85; Ni:0.04; Mo:0.61; W:1.76; V:0.007; Al:0.005; Cu:0.09; As:0.005; Surplus is Fe.
After each for coating raw material component is mixed, add 42 ~ 44 ° of Be ＂ d potassium-sodium water glasses accounting for solid constituent mass content 18 ~ 25%, prepare coating lotion, together with core wire, on welding rod production equipment, carry out welding rod preparation with common process.
According to the welding rod of above-mentioned explained hereafter, smooth surface, yield rate are high, bias is stable, and during welding, well, welding rod operating characteristics is excellent for arc stability, the removability of slag, appearance of weld is attractive in appearance, bead height is moderate, and weld seam wellability is moderate, and deposited metal mechanical property is: Rm=766MPa, Rp0.2=652MPa, A4=21%, (20 DEG C) KV2=75 ~ 95J, intensity, plasticity are moderate.
Embodiment 2
To get it filled skin, each component of coating and mass fraction as follows: marble: 33%, fluorite: 22%, electrolytic manganese: 2.1%, ferrosilicon: 2.2%, silicon powder: 6%, nickel powder: 1.5%, ferro-niobium: 0.5%, amorphous graphite: 0.4%, ferrotianium: 5%, soda ash: 0.8%, CMC:0.6%, vanadium iron: 1.2%, nitrided ferro-chromium: 1.1%, rutile 6.8%.
Get core wire, the special core wire of H08Cr9WMo that sulphur phosphorus arsenic tin equal size is low selected by core wire, and chemical composition mass percent is: C:0.04; Mn:0.43; Si:0.04; S:0.005; P:0.005; Cr:9.85; Ni:0.04; Mo:0.61; W:1.76; V:0.007; Al:0.005; Cu:0.09; As:0.005; Surplus is Fe.
After each for coating raw material component is mixed, add 42 ~ 44 ° of Be ＂ d potassium-sodium water glasses accounting for solid constituent mass content 18 ~ 25%, prepare coating lotion, together with the core wire of above-mentioned selection, on welding rod production equipment, carry out welding rod preparation with common process.
According to the welding rod of above-mentioned explained hereafter, smooth surface, yield rate are high, bias is stable, and during welding, well, welding rod operating characteristics is excellent for arc stability, the removability of slag, appearance of weld is attractive in appearance, bead height is moderate, and weld seam wellability is moderate, and deposited metal mechanical property is: Rm=751MPa, Rp0.2=630MPa, A4=20%, (20 DEG C) KV2=78 ~ 98J, intensity, plasticity are moderate.
Embodiment 3
To get it filled skin, each component of coating and mass fraction as follows: marble: 32%, fluorite: 25%, electrolytic manganese: 2.0%, ferrosilicon: 2.2%, silicon powder: 5.5%, nickel powder: 1.5%, ferro-niobium: 0.45%, amorphous graphite: 0.4%, ferrotianium: 5%, soda ash: 0.8%, CMC:0.6%, vanadium iron: 1.2%, nitrided ferro-chromium: 1.0%, rutile 6.5%.
Get core wire, the special core wire of H08Cr9WMo that sulphur phosphorus arsenic tin equal size is low selected by core wire, and chemical composition mass percent is: C:0.04; Mn:0.43; Si:0.04; S:0.005; P:0.005; Cr:9.85; Ni:0.04; Mo:0.61; W:1.76; V:0.007; Al:0.005; Cu:0.09; As:0.005; Surplus is Fe.
After each for coating raw material component is mixed, add 42 ~ 44 ° of Be ＂ d potassium-sodium water glasses accounting for solid constituent mass content 18 ~ 25%, prepare coating lotion, together with the core wire of above-mentioned selection, on welding rod production equipment, carry out welding rod preparation with common process.
According to the welding rod of above-mentioned explained hereafter, smooth surface, yield rate are high, bias is stable, and during welding, well, welding rod operating characteristics is excellent for arc stability, the removability of slag, appearance of weld is attractive in appearance, bead height is moderate, and weld seam wellability is moderate, and deposited metal mechanical property is: Rm=730MPa, Rp0.2=652MPa, A4=20%, (20 DEG C) KV2=86 ~ 95J, intensity, plasticity are moderate.
Claims (4)
1. a ultra supercritical Novel iron ferritic heat resistant steel electrode, the H08Cr9WMo special core wire low by sulphur phosphorus arsenic tin equal size and the coating wrapped in core wire surface form, and it is characterized in that described coating component and mass content thereof are:
Marble 28 ~ 40%;
Fluorite 18 ~ 28%;
Rutile 5 ~ 10%;
Ferrotianium 3 ~ 8%;
Silicon powder 4 ~ 10%;
Ferrosilicon 2 ~ 5%;
Vanadium iron 1 ~ 1.8%;
Ferro-niobium 0.4 ~ 0.8%;
Nickel powder 1 ~ 1.8%;
Soda ash 0.4 ~ 0.8%;
CMC?0.4～0.8％；
Amorphous graphite 0.2 ~ 0.6%;
Nitrided ferro-chromium 0.6 ~ 1.5%;
Electrolytic manganese 1.5 ~ 3%.
2. ultra supercritical Novel iron ferritic heat resistant steel electrode according to claim 1, is characterized in that described special core wire chemical composition mass percent is:
C:≤0.05％；
Mn:0.30-0.60％；
Si:≤0.15％；
S:≤0.006％；
P:≤0.006％；
Cr:8.50-10.0％；
Ni:≤0.20％；
Mo:0.50-0.70％；
W:1.40-1.90％；
Nb:≤0.07％；
N:≤0.07％；
Al:≤0.025％；
Cu:≤0.10％；
As:≤0.006％；
Surplus is Fe.
3. the production method of the ultra supercritical Novel iron ferritic heat resistant steel electrode described in a manufacturing claims 1 or 2, it is characterized in that adopted step is: after being mixed by each for described coating composition, adding weight is again that the binding agent of the 18-25% of coating weight stirs, then send in plodder and be wrapped on described core wire, then bake and bank up with earth and 350-380 DEG C of high-temperature bake through 80-100 DEG C of low temperature.
4. the production method of ultra supercritical Novel iron ferritic heat resistant steel electrode according to claim 3, is characterized in that described binding agent is sodium silicate, KP1 or potassium-sodium water glass.
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| CN102642102A (en) * | 2012-04-24 | 2012-08-22 | 吉林省电力有限公司电力科学研究院 | Welding rod capable of improving low-temperature welding property of 9Cr1Mo heat resistant steel |
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2012
- 2012-12-19 CN CN201210554241.1A patent/CN103008917B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000490A (en) * | 2019-05-17 | 2019-07-12 | 中国电建集团上海能源装备有限公司 | A kind of T/P92 heat resistant steel electrode and preparation method thereof |
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