CN106346167B

CN106346167B - A kind of martensite heat-resistant steel welding welding rod

Info

Publication number: CN106346167B
Application number: CN201610827615.0A
Authority: CN
Inventors: 刘正东; 陈正宗; 马龙腾; 包汉生; 干勇; 杨钢
Original assignee: Central Iron and Steel Research Institute
Current assignee: Central Iron and Steel Research Institute
Priority date: 2016-09-14
Filing date: 2016-09-14
Publication date: 2018-05-01
Anticipated expiration: 2036-09-14
Also published as: CN106346167A

Abstract

A kind of martensite heat-resistant steel welding welding rod, belongs to technical field of welding materials.It is made of core wire and coating, core wire component weight percentages are：C 0.07~0.10%；Si≤0.3%；Mn 0.3~0.7%；P≤0.004%；S≤0.002%；Cr 8.5~9.5%；W 2.8~3.3%；Co 2.8~3.5%；Nb 0.04~0.08%；V 0.15~0.25%；Cu 0.8~1.0%；N 0.007~0.011%；B 0.011~0.020%；Surplus Fe；Compositions of surfacing metal is：Marble 30%~45%；Fluorite 18%~25%；Rutile 5%~10%；Barium carbonate 10%~16%；Ferrotianium 5%~10%；Electrolytic manganese 1.5%~3%；Iron powder 5%~10%；Soda ash 0.4%~0.8%；Carboxymethyl cellulose 0.4%~0.8%；Hafnium metal powfer 0.8%~3%.Advantage is, arc stability during welding, splashes few, and all positon good operability, the removability of slag is good, appearance of weld is beautiful and postwelding deposited metal have with mother metal similar in high intensity, high tenacity, higher creep rupture strength, excellent crack-resistance sensitivity.

Description

A kind of martensite heat-resistant steel welding welding rod

Technical field

The invention belongs to technical field of welding materials, more particularly to a kind of martensite heat-resistant steel welding welding rod.Welding rod The supporting martensite heat-resistant steel G115 that is used for is welded, and arc stability during welding, splashes few, and all positon good operability, the removability of slag is good, weldering Be seamed into that shape is beautiful and postwelding deposited metal have with mother metal similar in high intensity, high tenacity, higher creep rupture strength, excellent is anti- Crack sensitivity.

Background technology

It is the most important measure for improving generatine set heat efficiency and realizing emission reduction of economizing on coal to improve fired power generating unit vapor (steam) temperature parameter.

At present, several, China large-scale power unit is just actively establishing the 630 DEG C of ultra supercritical fire coal Demonstration Stations in first of the world； Entrusted by National Energy Board, the total institute of power planning is in repeatedly organizing 650 DEG C of ultra-supercritical power generation technology feasibilities Seminar.

Heat proof material is to restrict main bottleneck problem of the fired power generating unit to higher parameters advances.Study and put into practice table Bright, P92 types martensite heat-resistant steel can be used for 620 DEG C of vapor (steam) temperatures to be manufactured with lower part heavy caliber boiler tube.Patent ZL " 201210574445.1 650 DEG C of Steel for steam-temperature ultra-supercritical thermal power unit and preparation method ", is China's independent development Available for the martensite heat-resistant steel of 650 DEG C of steam parameter ultra supercritical coal-fired units, i.e. heat resisting steel G115, its room temperature tensile Energy, impact property, mechanical behavior under high temperature and enduring quality are significantly larger than the P92 steel in GB5310 and ASME standards；Meanwhile its Also above the creep rupture strength value under patent CN 101680065 B " ferrite heat resistant steel " (i.e. SAVE12AD) the same terms about 20~30%.The martensite heat-resistant steel G115 of China's independent development can be used for 620 DEG C of -650 DEG C of vapor (steam) temperature heavy caliber boiler tubes Manufacture, therefore martensite heat-resistant steel G115 becomes following 630 DEG C and 650 DEG C of China ultra supercritical fire coal Demonstration Station main steam pipe The preferred material in road, in today that country promotes innovation driving development, has important practical significance.

During power plant construction and boiler erection, the connection between pipeline and pipeline is realized by welding, therefore, The processing performance of welding and the mechanical property of postwelding deposited metal are most important.Welding technological properties is poor, causes welding difficulty to increase Add, power plant construction cycle stretch-out, and influence weld metal mechanical property；If weld metal mechanical property and mother metal are not Match somebody with somebody, easily cause military service process piping weld metal initial failure to be broken.

According to document (Suppression of Grain Refinement in Heat-affected Zone of9Cr- 3W-3Co-VNb Steels,Materials Science&Engineering A,2016(655):168-174.) report, Easily there is the 4th type fracture (IV fracture of Type) in 9Cr-3W-3Co series heat-resistant steels postwelding, causes the deposited metal lasting longevity Life reduces.

103071946 B of patent CN " the supporting welding rod of overcritical ferritic heat-resistant steel and its production method ", core wire is carbon steel Silk, its chemical composition mass percent is C≤0.10%；Mn 0.30~0.55%；Si≤0.08%；S≤0.005%；P≤ 0.006%；Cr≤0.10%；Ni≤0.30%；Al≤0.030%；Cu≤0.20%；As≤0.007%；Surplus is Fe；With In welding supercritical pressure turbine ZG1Cr10MoVNbN and T91/P91 pipeline heat resisting steel.

103008917 B of patent CN " a kind of ultra supercritical ferritic heat-resistant steel welding rod and preparation method thereof ", core wire is The special core wires of H08Cr9WMo, its chemical composition mass percent are 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；For Weld ultra supercritical heat resisting steel T/P92.

103737199 B of patent CN " a kind of ultra supercritical heat resistant steel electrode and its production method ", core wire weld for H08A Core, its chemical composition mass percent are C≤0.05%；Mn 0.30~0.60%；Si≤0.15%；S≤0.006%；P≤ 0.006%；Cr≤0.20%；Ni≤0.20%；Mo≤0.20%；Nb≤0.07%；N≤0.07%；Al≤0.025%；Cu ≤ 0.10%；As≤0.006%；Surplus is Fe；For welding ultra supercritical heat resisting steel CB2/FB2.

There is no the supporting welding rod of the special heat resisting steel of martensite heat-resistant steel G115 on existing market also, no matter using the supporting welderings of P92 The problem of bar or nickel-base alloy (such as 617 nickel-base alloys and 82 alloys) welding rod, all presence can not overcome.One side deposited metal Room temperature, mechanical behavior under high temperature are poor, and strength and toughness mismatches, and enduring quality can not be met the requirements；On the other hand, two kinds of welderings All there are different degrees of arc stability is poor during bar welding, blow force of arc is small, and spatter is big, and welding bead is narrow, appearance of weld compared with Difference, the shortcomings of removability of slag is bad.

As China is closed on 630 DEG C of ultra supercritical fire coal Demonstration Station completions time of project, martensite heat-resistant steel G115 is that this shows The preferred material of model Main Steam Pipeline of Unit, is developed with welding rod matched, inexpensive martensite heat-resistant steel G115 for G115 Commercial introduction application, have important practical significance.Therefore, a kind of martensite heat-resistant steel G115 welding rod special for special is invented to compel in eyebrow It is prompt.

The content of the invention

Present invention aims at providing a kind of martensite heat-resistant steel welding welding rod, for martensite heat-resistant steel G115 into The features such as practicality divide, welded in comprehensive performance, and engineering, research and develop a kind of martensite heat-resistant steel G115 welding with specially With supporting welding rod, with reach G115 steel is welded, its weld deposited metal not only have with mother metal similar in chemistry into Point, and with match with excellent in strength-toughness that mother metal matches, high creep rupture strength and excellent cracking resistance energy, it is molten Metallisation 650 DEG C/10⁵Hour creep rupture strength extrapolated value is higher than 105MPa；For mother metal can be given full play to the welding of G115 steel Excellent performance, arc stability during welding, splashes few, and all positon good operability, the removability of slag is good, and appearance of weld is beautiful, overcomes existing Deficiency present in technology.

The present invention is that technical solution is used by solving its technical problem：

The welding rod of the present invention includes core wire, and wraps in the coating on core wire surface, and key is by weight percentage, Core wire component weight percentages are：C 0.07~0.10%；Si≤0.3%；Mn 0.3~0.7%；P≤0.004%；S≤ 0.002%；Cr 8.5~9.5%；W 2.8~3.3%；Co 2.8~3.5%；Nb 0.04~0.08%；V 0.15~ 0.25%；Cu 0.8~1.0%；N 0.007~0.011%；B 0.011~0.020%；Surplus is Fe；It is each in above core wire The total amount of component is 100%；Compositions of surfacing metal percetage by weight is：Marble 30%~45%；Fluorite 18%~25%；Rutile 5%~10%；Barium carbonate 10%~16%；Ferrotianium 5%~10%；Electrolytic manganese 1.5%~3%；Iron powder 5%~10%；Soda ash 0.4%~0.8%；Carboxymethyl cellulose 0.4%~0.8%；Hafnium metal powfer 0.8%~3%；By the powder of mentioned component press than Example after mixing, adds total mixture component and weighs 16%~25% binding agent and be uniformly mixed；It is then fed into plodder Inside wrapped on core wire, then bakeed through low temperature and high temperature according to a conventional method,；Gravity coefficient of coating K is 30~50%.

CaCO in above-mentioned marble₃Content >=96%, CaF in fluorite₂Content >=96%, rutile TiO₂>=96%, carbonic acid BaCO in barium₃>=98%；Ti contains 25~35% in ferrotianium；Na in soda ash₂CO₃>=99%；Mn >=99.5% in electrolytic manganese, metal Cr >=98% in chromium powder；Each component of the above is by weight percentage.

Described to add total component to weigh 16%~25% binding agent be potassium-sodium water glass, its modulus 2.8~3.0, and concentration is 41 °~43 °.

The low temperature stoving temperature is 80 DEG C~120 DEG C；High temperature stoving temperature is 380 DEG C~450 DEG C.

The principle of the invention is as described below：

Two aspects that welding considers：On the one hand it is deposited metal (weld seam) characteristic；On the other hand it is welding process craftsmanship.

Welding rod includes core wire and wraps up in the coating applied thereon.Core wire has two effects：First, conduction electric current, produces welding electricity Arc；Second, core wire melts the filling metal to be formed in weld seam in itself.Since core wire is in high arc temperature effect bottom fusing, formation Droplet transfer, the chemical composition and performance of core wire directly affected the performance and quality of weld seam into molten bath.

Core wire major consideration：Deposited metal composition and mechanical property are matched with mother metal, and tough with good impact Property, elevated temperature strength performance and excellent crack-resistance sensitivity, it is often more important that 650 DEG C/10⁵Hour creep rupture strength extrapolated value is higher than 105MPa.Therefore, when designing core wire component, welding process scaling loss is considered, core wire component considers as follows：

C：C content is higher in core wire, and stomata occurs in weld seam and the tendency of crackle is bigger.At the same time due to carbon in liquid metal The a large amount of CO formed are aoxidized, can also increase splashing, or stomata is formed in weld seam.Therefore, C content control in welding rod core wire of the present invention System 0.07~0.10%.

Cr：It, which is acted on, mainly three aspects：Matrix is dissolved in first, rising, plays solution strengthening effect；Second, easily form Cr₂O₃ Oxide-film, improves resistance to high temperature oxidation and corrosive nature；Third, form M₂₃C₆Type carbide, plays precipitation strength.Although improve Cr contents are conducive to high-temperature corrosion-resistance performance, but Cr too high levels can reduce creep rupture strength, therefore Cr in welding rod core wire of the present invention Content control 8.5~9.5%.

W：It is typical solution strengthening element, since the atomic radius of W is bigger than the atomic radius of Mo, W element solid solutions cause Distortion of lattice it is bigger than Mo element, so the solid solution strengthening effect of W elements is more obvious than Mo element.Experimental study shows：Other In the case that condition is constant, with the rise of W content, 9%Cr steel when W content is 3% or so, 10000 it is small when creep rupture strength With peak-peak；When W content superelevation, the generation of delta ferrite can be caused, it is very unfavorable to the comprehensive performance of steel.So this W content scope control is 2.8~3.3% in invention welding rod core wire.

Co：For containing the ferrite formers such as higher Cr-W solution strengthening elements and Nb-V precipitation strengths in steel, To suppress the formation of delta ferrite in steel, austenite former Co is added in steel to significantly inhibit the same of delta ferrite formation When, the other performance of steel is not adversely affected substantially.Research is found, 3% or so Co members are added in steel under the conditions of 650 DEG C Element has best influence to the creep rupture strength of steel.Therefore the Co contents in welding rod core wire of the present invention control 2.8~ 3.5%.

N and B：The effect of N mainly has two aspects：First, solution strengthening effect is played, but dissolving of the nitrogen in steel under room temperature Spend very little；Second, N can form small and dispersed Second Phase Particle with V, Nb, the creep rupture strength of material is significantly improved；But meeting Reduce its plasticity and toughness.B is easily combined into BN in molten pool metal process of setting with N, reduces the content of solid solution N, and B can also be refined Crystal grain, solid solution B can suppress the precipitation of the pro-eutectoid ferrite between austenite crystal, improve crack resistance, reduce hydrogen embrittlement.But containing compared with , may be with forming thick BN particles, in the obdurability of severe weakness steel itself if N content is excessive during the B element of high-content While, will also the B element for intercrystalline strengthening be consumed, so as to seriously damage the creep rupture strength of steel.Research shows that N contains There is one between amount and B content to match section, can both be formed in the proportioning section to avoid thick BN, while can be with Significantly lift heat resisting steel creep rupture strength in long at a temperature of 650 DEG C.Therefore, N content control exists in welding rod core wire of the present invention 0.007~0.011%；And B content control is 0.011~0.020%；And B/N is than controlling between 1~2.

Nb and V：Both are all carbides, can form the carbide NbC of stabilization, and this carbide is extremely steady It is fixed, it is possible to increase effect becomes apparent from during the compound addition of the creep limit of steel and creep rupture strength, particularly Nb and V.In addition, Nb can be carried The heat resistance of Gao Gang is due to form stable carbide NbC and Laves (NbFe₂) phase, dispersion-strengthened effect is preferable.But with The reduction of elongation percentage can be caused by the increase of Nb contents, this is because NbFe₂Volume ratio increase and cause, excessive Nb contents Significantly reduce the toughness of weld metal.Even if V-arrangement into carbide at higher operating temperatures under, also compare and be difficult to assemble, it is bright It is aobvious to reduce creep speed, improve the heat resistance of steel.Compound addition easily forms the MX carbide that tiny, disperse is stablized and produces precipitation Strengthen, it is optimal with 0.2%V-0.05%Nb combined effects, it is very big on creep rupture strength influence, and to welding performance (thermal crack resistant Line) and toughness Beneficial Effect.Therefore, their content must be strictly controlled.In welding rod core wire of the present invention Nb controls 0.04~ 0.08%；V content is controlled 0.15~0.25%；.

Cu：Solid solution can hinder dislocation movement to be formed so as to reduce creep rate in heat resisting steel in the base The nanometer copper-rich phase of Dispersed precipitate, pinning dislocation, improves the heat resistance of heat resisting steel.When Cu contents are less than 0.5%, Cu element bases In the base, the copper-rich phase amount of the nano-grade size of precipitation is few for this solid solution, and it is weak to strengthen effect.When Cu contents are higher than 3%, meeting The serious high-temp plastic for reducing steel.Therefore the scope for Cu contents being controlled in welding rod core wire of the present invention is 0.8~1.0%.

The harmful element such as S, P is larger to Affecting Rupture Strength in core wire, therefore also minimum as far as possible, respectively control S≤ 0.002%；P≤0.004%.

The effect of electrode coating is that formation is physico with suitable fusing point, viscosity, density, basicity etc. in welding process The slag of performance is learned, ensures arc stability burning, make the easy transition of deposited metal, a kind of gas is caused around arc region and molten bath Atmosphere, protection welding region, obtain good appearance of weld and performance etc..In addition, deoxidier, alloy member can be also added into coating The iron powder of element or certain content, meets weld metal performance or improves deposition efficiency.

Electrode coating mainly considers stabilising arc, slag making, deoxidation, gas making, alloying, bonding and shaping totally seven aspects, is related to Welding arc stablility, appearance of weld, welding position adaptability, spatter and deposited efficiency, the removability of slag etc..

Marble：Main component is CaCO₃, CaO and CO are resolved under the action of arc heat₂Gas, CaO are alkaline oxygen Compound, can improve the hardness of slag, stablize electric arc, refinement molten drop, increase surface between slag surface tension force and slag-metal Power, has de- S, de- P effects, improves the anti-crack ability of deposited metal, play the role of the effect of slag to liquid metal；CO₂Gas Physical efficiency reduces the hydrogen dividing potential drop in arc atmosphere, reduces weld seam hydrogen content, plays gas shielded to welding section.But CaCO₃Excessively When, not only it is roughened molten drop, and decompose CO₂The process of gas will drastically produce explosion and splash, so electrode coating of the present invention Middle marble control is 30%~45%.

Fluorite：Main component is CaF₂, belong to alkaline fluoride, a certain amount of fluorite can reduce the surface of liquid metal Tension force, improves the mobility of slag, reduces weld porosity, improves the physical property of slag, to appearance of weld, takes off slag etc. and plays key Effect, and reduce the main material of hydrogen content in weld seam；But fluorite decomposes in welding process, can produce pernicious gas-fluorination Hydrogen, causes electric arc unstable, therefore need to strictly control its content, and keeps marble/fluoride=1.7~2.2, therefore, this Fluorite controls content 18%~25% in invention electrode coating.

Rutile：Main component is TiO₂, belong to acidic oxide, main function is stabilising arc, slag making, can adjust slag Fusing point, viscosity, surface tension and mobility, improve appearance of weld, reduce splash, to appearance of weld, arc stability rise close Key acts on；But coating fusing point can be made higher, formula does not also form larger sleeve easily at that time, unfavorable to restarting.Welding rod of the present invention Rutile content control is 5%~10% in coating.

Barium carbonate：Slag physical property can be adjusted, it is in crisp cellular that can make slag, improves the effect of the removability of slag. The control of barium carbonate content is 10%~16% in electrode coating of the present invention.

Ferrotianium：Mainly play deoxidier, when being added together with electrolytic manganese, deoxidation effect is more preferably.Welding rod medicine of the present invention The control of ferrotianium content is 5%~10% in skin；

Electrolytic manganese：It can play the role of desulfurization, deoxidation, can also be strong to weld seam transition (infiltration) Mn elements, raising weld seam Degree.Manganese content control is electrolysed in electrode coating of the present invention 1.5%~3%.

Soda ash：Improve the extrusion performance of welding rod, while there is stabilising arc effect, but addition is excessive, then causes coating to hold The easy moisture absorption.Soda ash 0.4%~0.8% in electrode coating of the present invention.

Iron powder：Play the role of purify molten bath, while again can crystal grain thinning, improve deposition efficiency, improve weld impingement it is tough Property, but it is unsuitable excessive, because excessive addition iron powder can make other elementary dilutions.Iron powder amount is added in electrode coating of the present invention Control is 5%~10%.

Carboxymethyl cellulose：Cohesive action is played, improves extrusion performance.Carboxymethyl cellulose level in electrode coating of the present invention Control is 0.4%~0.8%.

Binding agent is potassium-sodium water glass.Waterglass is commonly called as sodium silicate, and scientific name alkali silicate, reflects waterglass characteristic There are modulus, concentration and viscosity., can be with addition to cementation is played due to containing the low ionization potential element such as potassium, sodium in waterglass Play the role of stabilising arc, and bonding agent also assists in metallurgical reaction in welding process, potassium-sodium water glass in electrode coating of the present invention Select high mode (2.8~3.0), 41 °~43 ° of concentration.

The present invention has the advantage that and beneficial effect：Martensite heat-resistant steel welding welding rod of the present invention by above-mentioned core wire into Point with coating each component Proper Match, so as to fulfill the purpose of the present invention.Martensite heat-resistant steel G115 is welded, welding is molten Full martensitic structure, quenched-temper are obtained after metallisation quenching, microscopic structure is the tempered sorbite of W solution strengthening, Matrix contains the M that tempering separates out₂₃C₆Class carbide, and tiny MX phases；Welding deposited metal composition not only has and mother metal Similar chemical composition, and with the excellent mechanical performance and high-lasting strength, excellent impact flexibility to match with mother metal With excellent cracking resistance energy；Welding point room temperature impact work(>=45J；740~800MPa of tensile strength at room temperature, yield strength 580~660MPa, elongation >=20%；Deposited metal 650 DEG C/10⁵Hour creep rupture strength extrapolated value is higher than 105MPa；And weld When arc stability, splash few, all positon good operability, the removability of slag is good, and appearance of weld is beautiful.

Embodiment

Below in conjunction with specific embodiment, the invention will be further described.

Embodiment 1

The mass percent of the present embodiment core wire component see the table below：

Element	C	Si	Mn	P	S	Cr	W	Co	Nb	V	Cu	N	B	Fe
															Wt.%	0.083	0.1	0.4	0.004	0.002	9.3	3.0	3.2	0.06	0.21	0.85	0.008	0.014	It is remaining

Wherein B/N=1.75.

The percentage by weight of each component see the table below in coating：

Raw material title	Percentage by weight	Raw material title	Percentage by weight
				Marble	40	Electrolytic manganese	2
Fluorite	22	Iron powder	8
				Rutile	8	Soda ash	0.6
Barium carbonate	12	Carboxymethyl cellulose	0.6
				Ferrotianium	6	Hafnium metal powfer	0.8

Wherein marble/fluorite=1.82；

Said ratio is compounded into welding rod crust spice, the binding agent with addition of powder raw material gross weight 22% is potassium-sodium water glass (potassium sodium is than 2: 1), its concentration are 42 °, are stirred evenly, and are sent into bar press and are wrapped according to a conventional method on core wire, then pass through When 85 DEG C of bakings 2.5 of low temperature are small, when 400 DEG C of bakings 1 of high temperature are small,.Gravity coefficient of coating K is 45%.It is made for diameter The welding rod of the various specification such as 2.5mm, 3.2mm, 4.0mm.

According to the electrode surface of above-mentioned technique productions is smooth, high yield rate, bias is stablized.Gained welding rod carries out welding examination Test, arc stability during welding, splash few, the removability of slag is good, and welding rod operating characteristics is excellent, and appearance of weld is beautiful, and bead height is fitted In, weld seam slip is moderate.

According to the welding rod of said ratio preparation, its deposited metal mechanical property is as follows：Room temperature impact work(75J；Tension at room temperature Intensity 760MPa, yield strength 600MPa, elongation 22%.

Embodiment 2

Element	C	Si	Mn	P	S	Cr	W	Co	Nb	V	Cu	N	B	Fe
															Wt.%	0.07	0.1	0.4	0.004	0.002	8.6	2.9	3.1	0.05	0.23	0.80	0.009	0.015	It is remaining

Wherein B/N=1.67.

The percentage by weight of each component see the table below in coating：

Raw material title	Percentage by weight	Raw material title	Percentage by weight
				Marble	35	Electrolytic manganese	2.5
Fluorite	20	Iron powder	10
				Rutile	10	Soda ash	0.8
Barium carbonate	13	Carboxymethyl cellulose	0.5
				Ferrotianium	7	Hafnium metal powfer	1.2

Wherein marble/fluorite=1.75；

Said ratio is compounded into welding rod crust spice, the binding agent with addition of powder raw material gross weight 25% is potassium-sodium water glass (potassium sodium is than 2: 1), its concentration are 42 °, are stirred evenly, and are sent into bar press and are wrapped according to a conventional method on core wire, then pass through When 85 DEG C of bakings 2.5 of low temperature are small, when 390 DEG C of bakings 1 of high temperature are small,.Gravity coefficient of coating K is 43%.It is made for diameter The welding rod of the various specification such as 2.5mm, 3.2mm, 4.0mm.

According to the welding rod of said ratio preparation, its deposited metal mechanical property is as follows：Room temperature impact work(85J；Tension at room temperature Intensity 750MPa, yield strength 590MPa, elongation 25%.

Embodiment 3

Element	C	Si	Mn	P	S	Cr	W	Co	Nb	V	Cu	N	B	Fe
															Wt.%	0.09	0.1	0.5	0.004	0.001	9.5	3.1	3.3	0.07	0.24	0.85	0.008	0.014	It is remaining

Wherein B/N=1.75.

The percentage by weight of each component see the table below in coating：

Raw material title	Percentage by weight	Raw material title	Percentage by weight
				Marble	45	Electrolytic manganese	1
Fluorite	21	Iron powder	6
				Rutile	5	Soda ash	0.8
Barium carbonate	10	Carboxymethyl cellulose	0.8
				Ferrotianium	9	Hafnium metal powfer	1.4

Wherein marble/fluorite=2.14；

Said ratio is compounded into welding rod crust spice, the binding agent with addition of powder raw material gross weight 16% is potassium-sodium water glass (potassium sodium is than 2: 1), its concentration are 43 °, are stirred evenly, and are sent into bar press and are wrapped according to a conventional method on core wire, then pass through When 90 DEG C of bakings 2 of low temperature are small, when 410 DEG C of bakings 1 of high temperature are small,.Gravity coefficient of coating K is 44%.It is made for diameter The welding rod of the various specification such as 2.5mm, 3.2mm, 4.0mm.

According to the welding rod of said ratio preparation, its deposited metal mechanical property is as follows：Room temperature impact work(70J；Tension at room temperature Intensity 785MPa, yield strength 620MPa, elongation 21%.

Using the above scheme, principal component is the martensite heat-resistant steel welding welding rod of 9Cr-3W-3Co systems to the present invention, can hand over, DC dual-purpose, all-position welding.Weld seam (deposited metal) component is not only close with mother metal chemical composition, and has and mother metal phase Matched excellent mechanical performance and high-lasting strength, excellent impact flexibility and excellent cracking resistance energy；And electric arc when welding Stablize, splashing is few, all positon good operability, and the removability of slag is good.To promote martensite heat-resistant steel G115 engineering applications to provide one The preferable welding material of kind.

Claims

1. a kind of martensite heat-resistant steel welding welding rod, it is characterised in that the welding rod includes core wire, and wraps in core wire surface Coating, core wire component weight percentages are：C 0.07~0.10%；Si≤0.3%；Mn 0.3~0.7%；P≤ 0.004%；S≤0.002%；Cr 8.5~9.5%；W 2.8~3.3%；Co 2.8~3.5%；Nb 0.04~0.08%；V 0.15~0.25%；Cu 0.8~1.0%；N 0.007~0.011%；B 0.011~0.020%；Surplus Fe；Above core wire In each component total amount be 100%；Compositions of surfacing metal percetage by weight is：Marble 30%~45%；Fluorite 18%~25%；Gold Red stone 5%~10%；Barium carbonate 10%~16%；Ferrotianium 5%~10%；Electrolytic manganese 1.5%~3%；Iron powder 5%~10%； Soda ash 0.4%~0.8%；Carboxymethyl cellulose 0.4%~0.8%；Hafnium metal powfer 0.8%~3%；By the powder of mentioned component After mixing in proportion, the binding agent for adding total mixture Ingredients Weight 16%~25% is uniformly mixed；It is then fed into Wrapped in plodder on core wire, then bakeed through low temperature and high temperature,；Gravity coefficient of coating K is 30~50%.

2. martensite heat-resistant steel welding welding rod according to claim 1, it is characterised in that each component in the coating The weight percent content of middle component：CaCO in marble₃Content >=96%, CaF in fluorite₂Content >=96%, rutile TiO₂ >=96%, BaCO in barium carbonate₃>=98%；Ti contains 25~35% in ferrotianium；Na in soda ash₂CO₃>=99%；Mn in electrolytic manganese >= 99.5%, Cr >=98% in hafnium metal powfer.

3. martensite heat-resistant steel welding welding rod according to claim 1, it is characterised in that it is described add total mixture into The binding agent for dividing weight 16%~25% is potassium-sodium water glass, its modulus 2.8~3.0, concentration is 41 °~43 °.

4. martensite heat-resistant steel welding welding rod according to claim 1, it is characterised in that the low temperature stoving temperature For 80 DEG C~120 DEG C；High temperature stoving temperature is 380 DEG C~450 DEG C.