CN114273818B - Submerged arc welding wire for 1.25% Cr-0.5% Mo-V steel in coal chemical industry and welding flux - Google Patents
Submerged arc welding wire for 1.25% Cr-0.5% Mo-V steel in coal chemical industry and welding flux Download PDFInfo
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- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a submerged arc welding wire and a welding flux for coal chemical 1.25% Cr-0.5% Mo-V steel, wherein a high-alkalinity fluorine-alkali welding flux is matched with a low-carbon low-impurity (P, S, sb, sn, as and the like) 1.25% Cr-0.5% Mo-V submerged arc welding wire, and a proper amount of trace elements are added, so that a welding seam still has high strength and excellent impact toughness after long-time high-temperature heat treatment, and has extremely low tempering embrittlement characteristics. The submerged arc welding wire and the welding flux have excellent welding operability, attractive weld joint forming and easy slag removal, and can be widely applied to the conditions of high temperature and high pressure in the coal chemical industry.
Description
Technical Field
The invention belongs to the field of welding materials, and particularly relates to a submerged arc welding wire, a welding flux and weld metal for submerged arc welding of 12Cr1MoV steel used in a high-temperature and high-pressure environment in coal chemical industry.
Background
Heat resistant steel is commonly used for parts operating at high temperatures in boiler manufacturing, steam turbines, industrial furnaces, power machinery, and in the aviation, petrochemical, and other industrial sectors. At present, the use temperature of the heat-resistant steel ranges from 200 ℃ to 1300 ℃, the working pressure ranges from several megapascals to tens of megapascals, and the working environment is quite complex. Therefore, the conventional heat-resistant steel welding material is required to have sufficient toughness, good workability and weldability, and a certain structural stability in addition to high-temperature strength and high-temperature creep property according to the application.
It is known that a 12Cr1MoV steel sheet has good oxidation resistance and heat resistance, and creep limit strength is very close to a permanent strength value, and has high plasticity in the case of permanent stretching. The method is widely applied to high-temperature, high-pressure, ultra-high-pressure and subcritical power station boiler superheaters, headers and main steam pipelines which work below 580 ℃ in the fields of petrochemical industry, coal chemical industry, nuclear power, steam turbine cylinders, thermal power and the like. Because the steel plates are harsh in use environment, the requirements on matched welding materials are high, and the welding is generally carried out by adopting a hand welding rod R317 in engineering arc welding. With the development of efficient welding modes in recent years, submerged arc welding is greatly developed and promoted in China, and submerged arc welding materials are becoming wide and mature. In 2014, the Luoyang double-Rayleigh first releases a 1Cr-0.5Mo-V heat resistant steel electrode suitable for a 12Cr1MoV steel plate, overcomes the defect of unstable impact toughness of the prior E5515-1CM (R317) electrode, and provides a high-toughness alloy heat resistant steel electrode (but does not disclose corresponding weld metal chemical compositions).
However, there are no submerged arc welding materials matched with 12Cr1MoV steel plates with high efficiency and high performance on the market, and so far, few patents related to heat-resistant steel submerged arc welding materials at home and abroad exist. The related patents retrieved by the inventors are as follows:
chinese patent CN102233492, kunshan group discloses a submerged arc welding wire for heat-resistant steel, the proposed welding wire is a submerged arc welding wire for 550 MPa-level heat-resistant steel, and is mainly applied to welding of 12Cr1Mo steel, and the composition and performance of the weld metal of the submerged arc welding wire cannot meet the welding requirement of 12Cr1MoV steel plate;
chinese patent CN 108213770, kunshan group discloses a metal powder cored wire and flux for 650 ℃ ultra supercritical thermal power generating unit, which is mainly used for submerged arc welding of G115 steel, and the composition and performance of the weld metal of the welding wire cannot meet the welding requirement of 12Cr1MoV steel plate;
chinese patent CN 104955607, japanese Kogyo discloses a submerged arc welding wire for high-strength 2.25Cr-1Mo-V steel and weld metal, which are mainly used for welding the high-strength 2.25Cr-1Mo-V steel, and the composition and performance of the weld metal can not meet the welding requirement of a 12Cr1MoV steel plate;
chinese patent CN 106399842, wu steel discloses a method for producing steel for submerged arc welding wire for heat-resistant steel, and mainly proposes a method for producing steel for submerged arc welding wire of 2.25Cr-1 Mo;
chinese patent CN 103056558, the forthcoming atlantic, discloses a submerged arc flux for low temperature impact and narrow gap submerged arc welding of chromium molybdenum heat resistant steel and a method for making the same, mainly aiming at the requirements of heat resistant steel and narrow gap submerged arc flux with special low temperature requirements;
chinese patent CN 112025048, sichuan-Siemens and Wuhan university disclose a submerged arc welding wire and a welding process of 9Cr-3W-3Co martensitic heat-resistant steel, which are mainly used for submerged arc welding of G115 steel, and the composition and performance of weld metal of the submerged arc welding wire cannot meet the welding requirement of a 12Cr1MoV steel plate.
The submerged arc welding wire or flux for heat-resistant steel related to the patent document is used for welding different types of heat-resistant steel, or the weld metal does not fall into the standard range, and is greatly different from the application field or technical route of the invention.
In order to overcome the defects in the background technology, the weldability of the 12Cr1MoV steel and matched welding materials are researched, and the submerged arc welding wire and the welding flux for the high-efficiency 1.25% Cr-1% Mo-V steel have important theoretical value and practical significance.
Disclosure of Invention
In order to solve the technical problems, the invention provides the submerged arc welding wire and the welding flux for the coal chemical industry 1.25 percent Cr-0.5 percent Mo-V steel, which have high creep strength, high toughness, low tempering brittleness and excellent welding operability, wherein the welding seam still has high strength and excellent impact toughness after long-time high-temperature heat treatment, and has high-temperature strength and extremely low tempering embrittlement characteristics. The submerged arc welding wire and the welding flux have excellent welding operability, attractive welding line formation and easy slag removal.
In order to achieve the technical effects, the technical scheme of the invention is as follows: submerged arc welding wires and welding flux for 1.25% Cr-0.5% Mo-V steel in coal chemical industry are used by matching high-alkalinity fluorine-base welding flux with low-carbon and low-impurity 1.25% Cr-0.5% Mo-V submerged arc welding wires;
(a) The low-carbon and low-impurity 1.25% Cr-0.5% Mo-V submerged arc welding wire comprises the following components in percentage by weight: c:0.04-0.06%; mn:0.40-0.65%; si:0.05-0.40%; p is less than or equal to 0.008 percent; s is less than or equal to 0.008 percent; ni is less than or equal to 0.2%; cr:0.85-1.50%; mo:0.40-0.65%; v:0.15-0.30%; cu is less than or equal to 0.10 percent; n is less than or equal to 0.010 percent; sb is less than or equal to 0.003%; sn is less than or equal to 0.003%; as is less than or equal to 0.003%; co is less than or equal to 0.05%; the balance of iron and other unavoidable impurities;
(b) The high-alkalinity fluorine base type submerged arc welding flux comprises the following components in percentage by weight: caF (CaF) 2 ：15-26％；BaF 2 ：5-10％；Al 2 O 3 ：10-18％；SiO 2 ：5-15％；TiO 2 ：3-8％；CaO：15-30％；MgO：8-16％；ZrO 2 ：2-10％；Na 2 O：1-3％；K 2 O：2.5-5％；Li 2 O：1-3％，LiF：0.5-2％；
(C) The submerged arc welding wire for the Mo-V steel comprises the following welding metal chemical components in percentage by weight: c:0.06-0.09%; mn:0.60-0.90%; si:0.10-0.45% (Mn+Si is less than or equal to 1.20%); p is less than or equal to 0.010 percent; s is less than or equal to 0.005%; ni is less than or equal to 0.2%; cr:0.80-1.40%; mo:0.40-0.60%; v:0.15-0.25%; al:0.015-0.035; ti:0.008-0.020; b:0.0005-0.0018; cu is less than or equal to 0.10 percent; n is less than or equal to 0.010 percent; sb is less than or equal to 0.004%; sn is less than or equal to 0.005%; as is less than or equal to 0.005%; co is less than or equal to 0.05%; the balance being iron and other unavoidable impurities.
Preferably, the high alkalinity fluorine base type flux comprises the following components: caF (CaF) 2 ：15-26％；BaF 2 ：5-10％；Al 2 O 3 ：12-16％；SiO 2 ：8-12％；TiO 2 ：3-8％；CaO：17-27％；MgO：10-15％；ZrO 2 ：4-8％；Na 2 O：1-2.3％；K 2 O：2.5-5％，Li 2 O：1-3％，LiF：0.5-2％。
Preferably, the granularity of the high-alkalinity fluorine base type flux is 10-60 meshes.
According to the content composition defined by the invention, the welding wire is combined with the welding flux to ensure that the welding bead is neat in shape and good in edge consistency; the fluidity of slag can be improved, and the stripping property of welding slag can be improved; the oxygen content of the weld metal can be controlled, so that the performance of the weld metal is further improved.
The submerged arc welding wire disclosed by the invention is matched with welding line metal combined by the welding flux, has high strength and excellent impact toughness after long-time high-temperature heat treatment, and has extremely low tempering embrittlement characteristics; excellent weldability, good slag stripping performance and beautiful weld joint formation.
In order to form a weld metal which has high strength and excellent impact toughness after long-time high-temperature heat treatment and has extremely low tempering embrittlement characteristics, repeated experiments and metallographic analysis are combined to adjust a formula so as to control the content and precipitation morphology of carbide and oxide and control microalloying of trace elements V, al, ti, B and the like as means for improving the high-temperature strength and the impact toughness. And the tempering embrittlement characteristics of the weld metal are controlled at an extremely low level by controlling the content of harmful elements such as P, S, sn, sb, as in the welding core and the submerged arc welding flux.
In order to control the precipitation form of carbon and oxide, the invention promotes the precipitation of fine carbide by the alloy element V which has strong binding force with C and preferentially forms carbide, and trace Ti and the like to achieve the dispersion strengthening effect, and forms a large amount of chromium carbide in the later stage to maintain the long-time high-temperature creep strength. The oxide is mainly derived from oxides in the welding flux, and minerals such as carbonate and the like are ionized and released into a molten pool in the welding process, and are combined with metal elements with higher activity in the welding wire such as Mn, si, trace alloy elements and the like to form the oxide, so that the oxide is used as particle nucleation to block excessive growth of crystal grains, refine the crystal grains and achieve the effect of improving the toughness of welding seams.
The invention specially develops a smelting low-carbon low-impurity 1.25% Cr-0.5% Mo-V steel homogeneous submerged arc welding wire which contains a specified amount of C, si, mn, P, S, ni, cr, mo, V, cu, co, N, sb, sn, as, and the balance of Fe and unavoidable impurities.
The reasons for limiting the submerged arc welding wire and the flux components for the 1.25% Cr-0.5% Mo-V steel in the coal chemical industry according to the present invention will be described below:
c is a component added to ensure room temperature strength, creep rupture strength and toughness of the weld metal. C can form strong carbide with certain alloys, and the carbide can improve the lasting creep property of the material in a dispersion strengthening way, but too high C content can lead to precipitation of excessive alloy elements, so that the lasting creep property is reduced. Meanwhile, a higher C content deteriorates weldability and increases age sensitivity of the weld, so that the C content in the welding wire should be controlled to be 0.04 to 0.06% in order to limit the C content in the weld metal to be described later to 0.06 to 0.09%.
Mn is a strengthening element, can improve the room temperature strength of weld metal, has obvious improving effect on the strength of pearlite heat-resistant steel, and is also beneficial to the impact toughness of weld metal. In addition, mn can remove S and has deoxidizing effect as Si. However, too little or too much Mn is disadvantageous, too little deoxidizing and desulfurizing effects are poor, too much Mn reduces the quenching temperature of the steel and the stability of high temperature ferrite of the structure, too much Mn embrittles weld grains and causes a significant tempering embrittlement tendency. In order to control the Mn content in the weld metal to be described later to be 0.60 to 0.90%, it is necessary to control the Mn content in the welding wire to be 0.40 to 0.65%.
Si is a strengthening element, can obviously improve the room temperature strength of weld metal, and the oxidation resistance of the weld at high temperature is beneficial to a certain content of Si, and is a component added by deoxidizing the weld metal. However, too high a Si content may reduce the weldability of the steel and may also reduce the toughness and plasticity of the weld joint. In order to control the Si content in the weld metal to be described later to be 0.10 to 0.45 mass%, the Si content in the welding wire should be controlled to be 0.05 to 0.40%.
P, S, which is a low melting point material, is to be controlled to a low level as much as possible because it is segregated to grain boundaries to cause tempering embrittlement and thermal cracking. In order to make the P content less than or equal to 0.010% and the S content less than or equal to 0.005% in the weld metal, both the P and S contents in the welding wire need to be controlled to be less than or equal to 0.008%.
Of course, reduction of impurities such As Sn, sb, as, etc. which tend to form low-melting-point substances other than P, S also contributes to improvement of tempering embrittlement characteristics and SR crack sensitivity of the weld metal. Therefore, it is preferable that: the Sn, sb and As contents in the welding wire are controlled to be less than 0.003 percent respectively.
Ni and Co are effective in improving weld metal toughness, but can result in significant reduction in creep strength. Ni does not improve creep resistance of ferrite, but increases hot brittleness of pearlite martensitic steel, so that Ni and Co of pearlite and martensitic steel should be controlled at low levels, and Ni is not more than 0.2% and Co is not more than 0.05% in weld metal, and Ni is not more than 0.2% and Co is not more than 0.05% in welding wire.
Cr, mo and V are the same as the basic components of 1.25% Cr-0.5% Mo-V steel, and are added to ensure corrosion resistance, oxidation resistance, room temperature strength and creep rupture strength. In order to control the Cr content of the weld metal to be 0.80-1.40%, the Cr content in the welding wire is required to be controlled to be 0.85-1.50%.
Mo is also a basic component of 1.25Cr-0.5Mo-V steel, and can obviously improve the room temperature strength and creep rupture strength. In order to make the Mo content in the weld metal be 0.40-0.60%, the Mo content in the welding wire should be controlled to be 0.40-0.65%.
V, cr and Mo are the same as 1.25% Cr-0.5% Mo-V steel, and are strong carbide forming elements, and are added to ensure room temperature strength and creep rupture strength. In order to control the V content in the weld metal to be 0.15-0.25%, the V content in the welding wire is required to be controlled to be 0.15-0.30%.
A small amount of Al can deoxidize and refine grains, inhibit aging of steel, and improve low-temperature toughness, oxidation resistance and fatigue strength, but higher Al can lead to remarkable reduction of high-temperature strength and toughness, so that the Al in the weld metal is mainly from welding flux, and the Al content in the weld metal is controlled to be 0.015-0.035%.
Ti is a strong deoxidizer, and the addition of a small amount of Ti can obviously refine grains, reduce ageing sensitivity and cold brittleness and inhibit tempering embrittlement possibly caused by higher Mn content. However, the Ti with higher content is easy to age harden and embrittle, and a brittle phase is easy to generate, so that the toughness of the welding seam is obviously reduced, and therefore, the welding seam metal Ti is mainly added by a welding flux, and the content is controlled to be 0.008-0.020%.
B is a component that greatly deteriorates SR cracking resistance. When the steel contains a small amount of B, the hardenability of the steel can be improved exponentially, and a small amount of boron in the low-carbon steel can also obtain good impact toughness through quenching and tempering. Therefore, a trace amount of B is added to the flux of the present invention and the B content in the weld metal is controlled to be 0.0005 to 0.0018%.
N in steel has very low solubility and can be precipitated in the form of nitride, the strength and hardness of the steel are obviously improved, the impact toughness and plasticity are deteriorated, and obvious aging embrittlement is generated, so that the trace addition of Al, ti, V and the like can fix N and eliminate the aging embrittlement tendency of N, and the N content in welding line metal is controlled to be less than or equal to 0.010 percent, and the N content in welding line metal is required to be set and controlled to be less than or equal to 0.010 percent.
The balance of the welding wire is Fe and unavoidable impurities. As the unavoidable impurities, sn, sb, as, pb, bi, for example, can be cited. Preferably, it is: the Sn, sb and As contents in the welding wire are respectively below 0.003%.
Among the temper brittleness sensitivity coefficients:
x coefficient=10p+5sb+4sn+as×10 -2 Technical requirements of industry are less than or equal to 15ppm;
j coefficient= (si+mn) × (p+s) ×10 4 Technical requirements of industry are less than or equal to 150 percent.
The reason why the main component of the high-basicity fluorine base type flux of the present invention is limited will be described below:
MgO can adjust the melting point and viscosity of the welding slag, and has the effect of improving slag detachability of the welding slag. MgO is also a high melting point compound, and in the present invention containing a large amount of fluoride, the melting characteristics can be adjusted and the shape of the weld bead can be improved. MgO is also a strongly basic compound that enables the weld metal to be purified. If the MgO content is too small, the above-mentioned effects cannot be obtained. On the other hand, if the MgO content is too large, the viscosity is significantly reduced, the melting point is significantly increased, and the shape of the weld bead is deteriorated. Therefore, in the present invention, the MgO content should be controlled to 8 to 16%. MgO is preferably 10 to 15%. MgO may be optionally added to magnesium oxide, magnesite, dolomite, or the like.
Al 2 O 3 The melting point of the welding slag can be adjusted, and the effect of improving the shape of the welding bead is achieved. Al (Al) 2 O 3 If the content of (c) is low, solidification of the weld metal and the slag becomes uneven due to the low melting point of the slag, and the shape of the weld bead becomes poor. On the other hand, al 2 O 3 If the content of (C) is high, the melting point of the slag becomes high, resulting in deterioration of the shape of the weld bead, and Al 2 O 3 Too high can significantly deteriorate weld metal impact toughness. Thus, in the present invention, al 2 O 3 The content of (2) should be controlled to10-18%. A preferable range is 12 to 16%. Al (Al) 2 O 3 The addition may be selected from alumina, aluminum oxide, corundum, and the like.
SiO 2 The welding slag coating agent can adjust the viscosity of the welding slag, and can improve the coating property of the welding slag and has good effect of the welding bead shape. SiO (SiO) 2 If the content of (b) is too low, the viscosity of the slag will be high, and the engagement between the weld bead and the base metal will be poor, so that slag inclusion and poor molding will be likely to occur. On the other hand, siO 2 If the content of (c) is high, the viscosity of the slag becomes too high, resulting in deterioration of the appearance of the weld bead, and also in deterioration of slag detachability. Furthermore, siO 2 Too high a content may also cause excessive Si in the weld metal, resulting in deterioration of the very low temperature impact after heat treatment of the weld metal, and on the other hand, too high an oxygen content may also deteriorate the impact toughness of the weld metal. During the manufacture of the flux, water glass (sodium silicate or potassium silicate) is added to act as a binder, and the water glass also contains SiO 2 Therefore, too much SiO is added to the flux of the present invention 2 The above problems occur with the raw materials. Thus, in the present invention, siO 2 The content of (2) should be controlled to be 5-15%. The preferable range is 8 to 12%. SiO (SiO) 2 Water glass derived from silica sand, wollastonite, feldspar, etc.
CaO and MgO are the same, can adjust the melting point and viscosity of the welding slag, and have the effect of improving slag detachability. In addition, caO is also an overbased compound element, so that weld metal can be purified. If the CaO content is low, the above-mentioned effects cannot be obtained. On the other hand, when the CaO content is high, the melting point of the slag increases and the fluidity is affected, resulting in deterioration of the shape of the weld bead. Therefore, in the present invention, the CaO content should be controlled to 15 to 30%. The preferable range is 17 to 27%, more preferably 20 to 25%. CaO may be optionally added to calcite, calcium carbonate, wollastonite, etc.
ZrO 2 The alkalinity and the melting point of the welding slag can be adjusted, and the effect of improving the coating property of the welding slag is also achieved. ZrO (ZrO) 2 When the content of (c) is high, the weld bead shape and slag detachability are deteriorated. Because ofIn the present invention, zrO 2 The content of (2) should be controlled to 2-10%. ZrO (ZrO) 2 The content of (2) is preferably in the range of 4 to 8%. ZrO (ZrO) 2 The addition may be selected from zircon sand, zirconia, and the like.
As in the prior art, a metal powder or an alloy powder may be added as an alloying agent. Then, fe-Si, fe-Mn, fe-Ti, fe-B, al/Mg alloy, etc. may be added to the flux as a deoxidizer. In addition, by adding more than 0.2% of Li in the form of fluoride, carbonate or oxide or silicate + 、Na + K is as follows + As arc stabilizer, the arc can be very stable. The preferred range of the arc stabilizer is 3.5-7%.
The metal fluoride has the effect of controlling the amount of oxygen in the weld metal. If F in metal fluoride - If the conversion value of (2) is less than 5%, the amount of oxygen in the weld metal increases, and the oxide increases during welding, resulting in deterioration of the toughness of the weld metal. On the other hand, if F in the metal fluoride - When the converted value of (2) exceeds 18%, the arc becomes unstable, and the weld bead shape becomes poor, so that slag peelability is deteriorated. Thus, F in metal fluoride - The conversion value of (2) is 5 to 18 mass%, and the fluoride may be optionally added from fluorite, barium fluoride, lithium fluoride rare earth fluoride, or the like.
The invention also adds a certain proportion of Li 2 O and LiF, which aim to improve the moisture absorption resistance of the flux and control the diffusion hydrogen of weld metal to be less than or equal to 4ml/100g by mercury method H;
regarding the particle size of the flux, the particle size is controlled to 10 to 60 mesh in the present invention. If the particle size is too large, a reaction cannot be sufficiently generated in the welding process, and thus the weld bead is formed to be poor or defects such as craters and air holes occur. On the other hand, too fine a particle size causes difficulty in recycling, resulting in an increase in use cost. Therefore, in the present invention, the particle size should be controlled to 10 to 60 mesh.
The flux is produced by mixing the raw materials in the range specified in the present invention, adding a potassium-sodium mixed water glass (binder) to the mixture to bond the mixture and granulate the mixture, then drying the mixture at 600 to 650 ℃ for 1 to 1.5 hours, and finally sieving the mixture in the particle size range of the present invention.
The welding flux is matched with proper raw materials and proportions to form a high-alkalinity slag system, so that the welding flux has excellent welding operability, simultaneously can reduce welding defects and improve the purity of weld metal, and is matched with low-carbon and low-impurity (P, S, sb, sn, as and the like) 1.25 percent Cr-0.5 percent Mo-V submerged arc welding wires for use. The weld metal obtained by using the welding flux still has excellent extremely low-temperature impact toughness and crack resistance after being subjected to heat treatment of 700-750 ℃ multiplied by 3-8H.
The invention has the beneficial effects that:
(1) The welding wire adopts a targeted smelting high-quality 1.25% Cr-0.5% Mo-V welding wire, the components are accurate and easy to control, the impurities and harmful elements are extremely low, and the welding wire is a basic guarantee of high strength, high impact toughness and low tempering brittleness; the high-alkalinity submerged arc welding flux can be better matched for use, so that the best welding effect is achieved;
(2) The flux adopts fluorine-base flux, has high alkalinity, low oxygen and low hydrogen, and transits trace Al and Ti elements, so that good physical and chemical properties can be obtained, and good welding operability is ensured;
(3) The content of the diffusion hydrogen of the deposited metal is <4ml/100g (mercury method);
(4) The room temperature tensile strength Rm is more than or equal to 580MPa under the heat treatment condition of 730 ℃ multiplied by 2-21h when the welding wire is matched with flux deposited metal, the low temperature toughness is excellent, the impact KV2 is more than or equal to 200J at 0 ℃, and the impact is more than or equal to 170J at-20 ℃;
(5) The welding wire flux combination weld metal has excellent high-temperature tensile strength, and under the heat treatment condition of 730 ℃ multiplied by 2-21h, the short-time high-temperature tensile of the weld metal at 550 ℃ is more than or equal to 360MPa;
(6) The weld metal tempering embrittlement sensitivity of the welding wire flux combination is extremely low, the tempering embrittlement sensitivity coefficient X is less than or equal to 10ppm, and the J coefficient is less than or equal to 120%.
The welding wire takes 1.25 percent Cr-0.5 percent Mo-V welding wire as a main transition alloy element for weld metal, uses fluorine alkali type flux to match the welding wire, adds trace elements, has the main component of 1.25 percent Cr-0.5 percent Mo-V, has good welding process performance when matched with the welding flux, and has the tensile strength Rm of the deposited metal of more than or equal to 580MPa, the impact of more than or equal to 200J at 0 ℃ and the impact of more than or equal to 170J at minus 20 ℃ under the heat treatment condition of 730 ℃ multiplied by 2-21 h; the invention provides a deposited metal component and microstructure similar to a 12Cr1MoV steel base metal through the control of element proportions such as Cr, mo, V, N and the addition of trace elements, and the invention has excellent high-temperature strength and low-temperature toughness, and extremely low tempering embrittlement characteristics, wherein the tempering embrittlement index X and J coefficients are far lower than the related technical requirements of industry, so that the welding wire and the welding flux are matched with each other to be particularly suitable for welding 1.25% Cr-0.5% Mo-V steel in coal chemical industry.
Detailed Description
For a better understanding of the present invention, the technical solution of the present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
A submerged arc welding wire and flux for 1.25% Cr-0.5% Mo-V steel in coal chemical industry are used by matching a high-alkalinity fluorine-base flux with a low-carbon and low-impurity 1.25% Cr-0.5% Mo-V submerged arc welding wire.
(a) The submerged arc welding wire comprises the following components in percentage by weight: c:0.04-0.06%; mn:0.40-0.65%; si:0.05-0.40%; p is less than or equal to 0.008 percent; s is less than or equal to 0.008 percent; ni is less than or equal to 0.2%; cr:0.85-1.50%; mo:0.40-0.65%; v:0.15-0.30%; cu is less than or equal to 0.10 percent; n is less than or equal to 0.010 percent; sb is less than or equal to 0.003%; sn is less than or equal to 0.003%; as is less than or equal to 0.003%; co is less than or equal to 0.05%; the balance of iron and other unavoidable impurities;
(b) The high-alkalinity fluorine base type flux comprises the following components in percentage by weight: caF (CaF) 2 ：15-26％；BaF 2 ：5-10％；Al 2 O 3 ：10-18％；SiO 2 ：5-15％；TiO 2 ：3-8％；CaO：15-30％；MgO：8-16％；ZrO 2 ：2-10％；Na 2 O：1-3％；K 2 O：2.5-5％；Li 2 O：1-3％，LiF：0.5-2％；
(C) The submerged arc welding wire for the Mo-V steel comprises the following welding metal chemical components in percentage by weight: c:0.06-0.09%; mn:0.60-0.90%; si:0.10-0.45% (Mn+Si is less than or equal to 1.20%); p is less than or equal to 0.010 percent; s is less than or equal to 0.005%; ni is less than or equal to 0.2%; cr:0.80-1.40%; mo:0.40-0.60%; v:0.15-0.25%; al:0.015-0.035; ti:0.008-0.020; b:0.0005-0.0018; cu is less than or equal to 0.10 percent; n is less than or equal to 0.010 percent; sb is less than or equal to 0.004%; sn is less than or equal to 0.005%; as is less than or equal to 0.005%; co is less than or equal to 0.05%; the balance being iron and other unavoidable impurities.
In one embodiment of the invention, the flux is prepared by mixing the raw materials according to a certain composition, adding potassium-sodium mixed water glass (binder) for bonding and granulating, then drying at 600-650 ℃ for 1-1.5 hours, and finally sieving according to the granularity range of 10-60 meshes to obtain the finished flux.
The submerged arc welding wire and the flux for the coal chemical 1.25% Cr-0.5% Mo-V steel are used by matching high-quality low-carbon low-impurity 1.25% Cr-0.5% Mo-V submerged arc welding wire with high-alkalinity fluorine-base flux. Wherein, the specific content of the 1.25 percent Cr-0.5 percent Mo-V submerged arc welding wire is shown in the table 1.
TABLE 1 welding wire composition examples (wt.%)
The high alkalinity fluorine base type flux in the invention, the specific content in the examples is shown in table 2.
TABLE 2 Fluoroalkali type flux composition examples (wt%)
The weld metal chemistry of the examples is shown in table 3.
TABLE 3 weld metal composition examples (wt.%)
Examples weld metal mechanical properties, temper embrittlement susceptibility coefficients, and diffused hydrogen are shown in table 4, wherein the measurement of the diffused hydrogen was performed by mercury method, and three sheets were tested to obtain an average value.
TABLE 4 deposited metal Performance test results for various examples
Description: 1. x coefficient=10p+5sb+4sn+as×10 -2 Technical requirements of industry are less than or equal to 15ppm, and the invention is less than 10ppm;
2. j coefficient= (si+mn) × (p+s) ×10 4 Technical requirements of industry are less than or equal to 150 percent, and the invention is less than 120 percent;
3. therefore, the weld metal tempering embrittlement sensitivity obtained by the submerged arc welding wire and welding flux combination is low.
The main component of the welding seam is 1.25% Cr-0.5% Mo-V, the welding wire and the welding flux are good in welding technological performance, the welding seam is attractive in molding and easy to remove slag, the tensile strength Rm of the welding seam metal is more than or equal to 580MPa under the heat treatment condition of 730 ℃ multiplied by 2-21h, the impact at 0 ℃ is more than or equal to 200J, and the impact at 20 ℃ is more than or equal to 170J. The invention provides a deposited metal component and microstructure similar to a 12CrMoV steel base metal through the control of element proportions of Cr, mo, V and the like and the addition of trace elements, and the welding wire and the welding flux are matched and are particularly suitable for welding 1.25 percent Cr-0.5 percent Mo-V steel at high temperature and high pressure in coal chemical industry.
The invention takes low carbon and low impurity 1.25 percent Cr-0.5 percent Mo-V welding wire as main material, matches fluorine-base welding flux, adds trace alloy elements, takes submerged arc welding wire as main material to transfer alloy elements to weld metal, has extremely low diffusion hydrogen (less than 3ml/100 g) and extremely low tempering embrittlement sensitivity (tempering embrittlement sensitivity coefficient X < 10ppm, J < 120 percent), has excellent high temperature tensile strength (more than or equal to 360 MPa) at the temperature of more than 550 ℃, and is suitable for welding high-temperature and high-pressure 1.25 percent Cr-0.5 percent Mo-V steel in coal chemical industry.
In order to ensure high-quality high-temperature performance and good mechanical performance, the invention specially develops and smelts a high-quality low-carbon low-impurity 1.25% Cr-0.5% Mo-V homogeneous core wire, and uses high-alkalinity fluorine-base type flux in a matched manner. The weld metal is mainly transited by a submerged arc welding wire, and the submerged arc welding flux plays roles of deoxidization, impurity removal, microalloying and molten pool protection. The submerged arc welding wire and the welding flux have the advantages of high strength and excellent impact toughness of welding seams after long-time high-temperature heat treatment, high-temperature strength and extremely low tempering embrittlement. The submerged arc welding wire and the welding flux have excellent welding operability, attractive welding line formation and easy slag removal. Widely applied to the high-temperature and high-pressure conditions of the coal chemical industry.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present invention.
Claims (2)
1. The combination of submerged arc welding wires for 1.25% Cr-0.5% Mo-V steel in coal chemical industry and welding flux is characterized in that high-alkalinity fluorine-base welding flux is matched with low-carbon low-impurity 1.25% Cr-0.5% Mo-V submerged arc welding wires for use;
(a) The low-carbon and low-impurity 1.25% Cr-0.5% Mo-V submerged arc welding wire comprises the following components in percentage by weight: c:0.04-0.06%; mn:0.40-0.65%; si:0.05-0.40%; p is less than or equal to 0.008 percent; s is less than or equal to 0.008 percent; ni is less than or equal to 0.2%; cr:0.85-1.50%; mo:0.40-0.65%; v:0.15-0.30%; cu is less than or equal to 0.10 percent; n is less than or equal to 0.010 percent; sb is less than or equal to 0.003%; sn is less than or equal to 0.003%; as is less than or equal to 0.003%; co is less than or equal to 0.05%; the balance of iron and other unavoidable impurities;
(b) The high-alkalinity fluorine base type flux comprises the following components in percentage by weight: caF (CaF) 2 ：15-26%；BaF 2 ：5-10%；Al 2 O 3 ：10-18%；SiO 2 ：5-15%；TiO 2 ：3-8%；CaO：15-30%；MgO：8-16%；ZrO 2 ：2-10%；Na 2 O：1-3%；K 2 O：2.5-5%；Li 2 O：1-3%，LiF：0.5-2%；
Basicity coefficient b=≥2；
(c) The welding seam metal formed by the combination of the submerged arc welding wire for the Mo-V steel with the chemical content of Cr of 1.25 percent and Mo-V of 0.5 percent comprises the following chemical components in percentage by weight: c:0.06-0.09%; mn:0.60-0.90%; si:0.10-0.45% (Mn+Si is less than or equal to 1.20%); p is less than or equal to 0.010 percent; s is less than or equal to 0.005%; ni is less than or equal to 0.2%; cr:0.80-1.40%; mo:0.40-0.60%; v:0.15-0.25%; al:0.015-0.035; ti:0.008-0.020; b:0.0005-0.0018; cu is less than or equal to 0.10 percent; n is less than or equal to 0.010 percent; sb is less than or equal to 0.004%; sn is less than or equal to 0.005%; as is less than or equal to 0.005%; co is less than or equal to 0.05%; the balance of iron and other unavoidable impurities;
the granularity of the high-alkalinity fluorine alkali type flux is 10-60 meshes.
2. The combination of submerged arc welding wire and flux for coal chemical industry 1.25% cr-0.5% mo-V steel according to claim 1, wherein the high alkalinity fluorine base type flux comprises the following components: caF (CaF) 2 ：15-26%；BaF 2 ：5-10%；Al 2 O 3 ：10-18%；SiO 2 ：8-12%；TiO 2 ：3-8%；CaO：17-27%；MgO：10-15%；ZrO 2 ：4-8%；Na 2 O：1-2.3%；K 2 O：2.5-5%，Li 2 O：1-3%，LiF：0.5-2%。
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