CN102233493B - Submerged-arc welding wire for high-intensity low-temperature steel - Google Patents
Submerged-arc welding wire for high-intensity low-temperature steel Download PDFInfo
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- CN102233493B CN102233493B CN 201010163798 CN201010163798A CN102233493B CN 102233493 B CN102233493 B CN 102233493B CN 201010163798 CN201010163798 CN 201010163798 CN 201010163798 A CN201010163798 A CN 201010163798A CN 102233493 B CN102233493 B CN 102233493B
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Abstract
The invention discloses a submerged-arc welding wire and a submerged-arc welding flux for high-intensity low-temperature steel. After being matched with each other, the welding wire and the welding flux have extremely high welding operation performance that: an electric arc is stable, a welding seam is aesthetically molded, slag is easy to remove, and high crack resistance and high low-temperature impact properties are realized; and the welding seam (after being subjected to post-weld heat treatment at the temperature of 620 DEG C for 1 hour) has metal mechanical properties that: tensile strength is 480 to 660MPa, yield strength is 400 to 550MPa, elongation rate is 22 to 35 percent, and Charpy impact work is AKv(-51 DEG C) which is more than or equal to 160J.
Description
Technical field
The present invention relates to a kind of welding wire, relate in particular to a kind of high strength low temperature submerged arc welding wire for steel, its weld metal has 490-660MPa tensile strength ,-51 ℃ of ballistic work AKv 〉=160J.
Background technology
To be 19 end of the centurys grow up in that liquid air is industrial cryogenic technique, along with progress of science and technology, cryogenic technique has obtained developing rapidly in nearly 30 years, and is widely used in industries such as low-temperature pressure container, ocean engineering, harbour machinery, bridges.Low-temperature pressure container is the key equipment of low-temperature industrial process, and the characteristics of carbon steel and low alloy steel system low-temperature pressure container are to be easy to generate black brittleness to destroy, and low-temperature brittle fracture is not have unexpected generation the under the situation of omen, and harmfulness is very big.Low-temperature steel generally can be divided into by the crystal lattice type: body-centred cubic ferritic steel for low temperature service and face-centred cubic austenite low-temperature steel two big classes.Significantly tough-crisp the transition temperature of the general existence of ferritic steel for low temperature service the phenomenon that toughness descends suddenly can occur when temperature is reduced to certain critical value (or interval).Therefore how guaranteeing having good toughness under a certain cryogenic conditions, is the quality requirement that the low-temperature pressure container manufacturing must be considered.In steel-making, generally need to add alloying elements such as Mn, Ni, reduce interstitial impurity, crystal grain thinning, size, form and the distribution etc. of second phase in the control steel, make the tough-brittle transition temperature of ferritic steel be lower than serviceability temperature, like this, could guarantee low-temperature steel security in use.Corresponding with it low-temperature steel with welding material application at home also more and more widely, the consumption of wlding grows with each passing day.When some important large-scale component connects, generally can adopt submerged-arc welding because submerged-arc welding not only efficient is higher, and welding quality is good.But the high strength low-temperature steel SAW consumable material that really is at present domestic welding manufacturers produce is very limited, and much this class wlding all is by external import.
Summary of the invention
In order to overcome above-mentioned defective, the invention provides a kind of high strength low temperature submerged arc welding wire for steel, overcome the obstacle of present domestic production technology, also improved low-temperature impact toughness, make it to be widely used in the welding of some special components in places such as low-temperature pressure container, ocean engineering, harbour machinery, bridge, make weld metal tensile strength reach 480-660MPa ,-51 ℃ of ballistic work AKv 〉=160J.
The present invention for the technical scheme that solves its technical problem and adopt is:
A kind of high strength low temperature submerged arc welding wire for steel, each composition is respectively with respect to the percentage by weight of this welding wire in the described welding wire,
C：0～0.120％；
Si：0.05～0.30％；
Mn：1.10～1.35％；
P：0～0.020％；
S：0～0.020％；
Ni：0.75～1.25％；
Mo：0.10～0.20％；
Cu：0～0.35％；
Surplus is iron and other inevitable impurity.
Below be to further specify to of the present invention:
For high strength low-temperature steel welding material, require weld metal that high intensity is not only arranged, low tough-crisp transition temperature also will be arranged, generally realize this purpose by adding a certain amount of alloying element.The collocation of its various alloying elements is extremely important for welding wire, below just to the effect of all kinds of alloy gold elements in the welding wire of the present invention and limit content and be illustrated:
C: in steel, exist, can gain in strength with interstitial atom, but C content cross at most and can reduce toughness, also easily crack, make the welding operation variation, therefore, C content should be controlled at a lower scope.For welding wire for submerged-arc welding of the present invention, C≤0.12%, and solder flux can realize not increasing C substantially, can guarantee C content lower in the weld metal like this.
Mn: be good deoxidier and solution strengthening element: on the one hand, Mn combines with oxygen in the molten iron and forms the higher MnO impurity of fusing point and form slag along with the cooling of steel, to reach the purpose of deoxygenation; On the other hand, the Mn atom produces solution strengthening by forming solid solution in the crystalline substance bag that is diffused into the Fe atom; In addition, Mn increases the effect of toughness, reduction transition temperature and expansion austenite phase region in addition.But the too high levels of Mn then can produce grain coarsening, increases the sensitiveness of temper brittleness.Content with the Mn of welding wire among the present invention is controlled at 1.20-1.60%, and solder flux influences hardly to manganese content.
Si: can be dissolved in the intensity and the hardness that improve steel in ferrite and the austenite, but when content surpasses 3%, will significantly reduce the plasticity and the toughness of steel.Si is good deoxidier, is to drink to add a certain amount of Si with aluminium deoxidation, can significantly improve the deoxidizing capacity of aluminium.But Si can reduce the weldability of steel, because Si is stronger than iron with the affinity of oxygen, generates low-melting silicate easily when welding, increases the flowability of slag and deposite metal, causes the splash phenomenon, influences weldquality.Therefore, the content of Si is unsuitable too high, and the Si content of welding wire for submerged-arc welding of the present invention should be controlled at 0.05-0.30%, and content is lower, but owing to SiO in the solder flux
2Existence, can butt welding be sewed with certain Si effect that increases, improved deoxidizing capacity and also made the molten bath have certain fluidity.
Ni: energy refine pearlite in steel, total effect is to improve intensity, and is not remarkable to the influence of plasticity.Ni can improve the drag and minimizing steel sensitiveness to breach of steel to fatigue, and Ni can reduce the black brittleness transition temperature of steel, and this has extremely important meaning to low-temperature steel.In addition, go back withstand corrosion in the Ni adding steel, not only acidproof, and can be alkaline-resisting, atmosphere and salt all there are resistance to corrosion.The content of Ni is controlled at 0.75-1.25% in the welding wire for submerged-arc welding of the present invention, and the Ni element is not carried out alloy transition in the solder flux, but in welding process also not burning Ni.
Mo: add in the steel and can improve quenching degree, the creep of Mo ability, anti-spot corrosion, seawater corrosion resistance.The content of submerged arc welding flux Mo of the present invention is 0.10-0.30%, and the Mo element is not carried out alloy transition in the solder flux, but in welding process also not burning Mo.
P: can reduce the plasticity and the toughness of steel, it is cold short to cause steel to produce when cold working, and P also has harmful effect to weldability.Among the present invention the content of P is controlled at reduced levels below 0.020%, in the solder flux of majority, the unavoidable butt welding of postwelding is sewed with the ill effect that increases P, but the solder flux among the present invention can be avoided the generation of this problem, thereby has reduced the impurity in the weld seam as far as possible.
S: be harmful element, in steel segregation serious, in welding process, easily generate low-melting compound, be the main cause that causes hot tearing.Therefore its content should strict be controlled, and the content of the S of welding wire for submerged-arc welding of the present invention≤0.020%, solder flux can reduce the S content in the weld seam, and general reduction can reach more than 0.005, thereby makes the S content of weld metal lower.
Because welding wire and solder flux are closely connected, solder flux will have enough stability, could guarantee to have in welding process good welding operation and postwelding weld seam that good mechanical performance is arranged, to guarantee the security of postwelding member.
The invention has the beneficial effects as follows: the chemical composition of welding wire for submerged-arc welding of the present invention contains lower C, higher Mn and Ni, contain a spot of Mo, to the content of harmful element P, S control very low (＜0.01%), welding wire of the present invention cooperates the weld job performance splendid with suitable solder flux: arc stability, appearance of weld is attractive in appearance, and it is easy to take off slag, and crack resistance is good and have a good low temperature impact properties; Its weld metal mechanical performance (through 620 ℃ of * 1h post weld heat treatment) is: tensile strength 480-660MPa, yield strength 400-550MPa, percentage elongation 22-35%, Charpy-V impact power are AKv (51 ℃) 〉=160J.
The specific embodiment
Below in conjunction with specific embodiment the present invention is elaborated:
Because the use of welding wire and solder flux is closely connected, solder flux will have enough stability, could guarantee to have in welding process good welding operation and postwelding weld seam that good mechanical performance is arranged, to guarantee the security of postwelding member.Select corresponding solder flux for use at welding wire of the present invention among the following embodiment, except the compound that routinizes, also added TiO in this solder flux
2, B
2O
3, adding these two kinds of compound purposes is excessive Ti and B in deposited metal.Ti, B have the big effect just of the crystal grain of inhibition, and wherein Ti can form carbide and nitride, and effectively the pinning crystal boundary stops austenite crystal to be grown up, and the effect of strong crystal grain thinning is arranged; And add a spot of B is in order to be used with other elements, to form acicular ferrite, playing better cracking resistance effect.This solder flux is formed through high temperature sintering by following raw material, and each raw material is with respect to the percentage by weight difference of this solder flux raw material total amount: CaF
2: 10～30%; MgF
2: 5～15%; CaO:5～20%; MgO:10～25%; Al
2O
3: 10～30%; SiO
2: 5～15%; TiO
2: 1～5%; B
2O
3: 0.1～0.8%.
Embodiment 1: smelt three kinds of welding wires (specification 4.0mm) with the designed component of weld wire of the present invention, note do welding wire 1., welding wire 2., welding wire 3., its chemical composition sees Table one; Make four kinds of solder flux with the designed solder flux of the present invention, note do solder flux 1., solder flux 2., solder flux 3., solder flux 4., its chemical composition sees Table two; Cooperate welding with solder flux with welding wire of the present invention, weld procedure specification is: electric current 550A, voltage 32V, speed of welding 420mm/min, postwelding carry out (620 ℃ * 1 hour) heat treatment, in the welding process operation good, postwelding test plate (panel) film making pore-free.The physical and chemical performance of postwelding deposited metal such as following table three and table four:
Table one welding wire chemical composition (weight %)
Table two solder flux constituent (weight %)
Table three welding wire and solder flux Combination Welding gained deposited metal composition
Table four welding wire and solder flux Combination Welding gained deposited metal mechanical performance
Embodiment 2: (5. note makes solder flux with a kind of SJ101 solder flux of buying on welding wire of the present invention and the market, flux constituent sees the following form five) cooperate and weld, weld procedure specification is: electric current 550A, voltage 32V, speed of welding 420mm/min, 620 ℃ of * of postwelding heat treatment in 1 hour, in the welding process operation good, postwelding test plate (panel) film making is qualified.The physical and chemical performance of postwelding deposited metal such as following table six and table seven:
Table five solder flux constituent 5.
5. table six welding wire combination of the present invention solder flux welds the gained deposited metal composition
6. table seven welding wire combination of the present invention solder flux welds gained deposited metal mechanical performance
When being used by the foregoing description explanation welding wire of the present invention and solder flux good welding operation and mechanical performance are arranged, be suitable for the welding of other high strength low-temperature steel of 480-660MPa level, its low-temperature impact toughness is very high.Cooperate when welding with solder flux that market is purchased with welding wire of the present invention, operability is preferably also arranged, but mechanical performance is low when being used with solder flux of the present invention, particularly the cold impact value drop is bigger, and when impacting as-70 ℃, its value is very low.The physics of its deposited metal, chemical property all can satisfy the requirement of welding in places such as low-temperature pressure container, ocean engineering, harbour machinery, bridge when in sum, welding wire of the present invention and solder flux were used.
Claims (1)
1. high strength low temperature submerged arc welding wire for steel, it is characterized in that: each composition is respectively with respect to the percentage by weight of this welding wire in the described welding wire,
C：0～0.120％；
Si：0.05～0.30％；
Mn：1.10～1.35％；
P：0～0.020％；
S：0～0.020％；
Ni：0.75～1.25％；
Mo：0.10～0.20％；
Cu：0～0.35％；
Surplus is iron and other inevitable impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010163798 CN102233493B (en) | 2010-04-27 | 2010-04-27 | Submerged-arc welding wire for high-intensity low-temperature steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010163798 CN102233493B (en) | 2010-04-27 | 2010-04-27 | Submerged-arc welding wire for high-intensity low-temperature steel |
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| CN102233493A CN102233493A (en) | 2011-11-09 |
| CN102233493B true CN102233493B (en) | 2013-07-31 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632349B (en) * | 2012-05-16 | 2013-07-24 | 蒋才银 | Automatic submerged arc welding flux and preparation method thereof |
| CN103464930B (en) * | 2013-09-18 | 2016-05-18 | 海宁瑞奥金属科技有限公司 | Welding wire and solder flux and the application thereof for submerged arc welding of a kind of 9Ni low-temperature steel |
| CN104096987B (en) * | 2014-07-16 | 2017-01-18 | 武汉铁锚焊接材料股份有限公司 | High-basicity and high-tenacity submerged-arc welding flux for oceaneering and preparation method of high-basicity and high-tenacity submerged-arc welding flux |
| CN104607822B (en) * | 2014-12-10 | 2017-03-08 | 江苏省沙钢钢铁研究院有限公司 | A kind of high-strength line-pipe submerged arc weld metal |
| CN106078003B (en) * | 2016-06-30 | 2020-01-03 | 南京南化建设有限公司 | Alkaline smelting flux for submerged-arc welding and application |
| CN108115306A (en) * | 2016-11-28 | 2018-06-05 | 海宁瑞奥金属科技有限公司 | A kind of slag Welding flux-cored wire |
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| CN1258579A (en) * | 2000-01-19 | 2000-07-05 | 武汉钢铁(集团)公司 | High-strength and high-toughness submerged-arc welding wire |
| CN1376553A (en) * | 2001-03-28 | 2002-10-30 | 中国科学院金属研究所 | Welding wire for hidden arc welding of high-strength line-pipe steel |
| CN101537549A (en) * | 2009-04-14 | 2009-09-23 | 武汉钢铁(集团)公司 | High-strength and high-toughness automatic submerged arc welding wire with weathering resistance |
| CN101817122A (en) * | 2009-02-26 | 2010-09-01 | 上海大西洋焊接材料有限责任公司 | High-toughness submerged arc welding wire |
Family Cites Families (3)
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| JPS61147990A (en) * | 1984-12-21 | 1986-07-05 | Kobe Steel Ltd | Submerged arc welding wire for high tension steel |
| JPH01107998A (en) * | 1987-10-22 | 1989-04-25 | Nippon Steel Corp | Wire for welding rail |
| JPH117998A (en) * | 1997-06-11 | 1999-01-12 | Minnesota Mining & Mfg Co <3M> | Cover tube for wire connection part and wire connection device |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258579A (en) * | 2000-01-19 | 2000-07-05 | 武汉钢铁(集团)公司 | High-strength and high-toughness submerged-arc welding wire |
| CN1376553A (en) * | 2001-03-28 | 2002-10-30 | 中国科学院金属研究所 | Welding wire for hidden arc welding of high-strength line-pipe steel |
| CN101817122A (en) * | 2009-02-26 | 2010-09-01 | 上海大西洋焊接材料有限责任公司 | High-toughness submerged arc welding wire |
| CN101537549A (en) * | 2009-04-14 | 2009-09-23 | 武汉钢铁(集团)公司 | High-strength and high-toughness automatic submerged arc welding wire with weathering resistance |
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