CN101288925A - High intensity gas shielded welding wire, wire rod and application thereof - Google Patents
High intensity gas shielded welding wire, wire rod and application thereof Download PDFInfo
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- CN101288925A CN101288925A CNA2007100397497A CN200710039749A CN101288925A CN 101288925 A CN101288925 A CN 101288925A CN A2007100397497 A CNA2007100397497 A CN A2007100397497A CN 200710039749 A CN200710039749 A CN 200710039749A CN 101288925 A CN101288925 A CN 101288925A
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Abstract
The invention provides a gas protection welding wire rod and a welding wire thereof. Both the wire rod and the welding wire comprises the following elements (according to the weight percent): C is 0.03 to 0.12, Si is 0.30 to 0.80, Mn is 1.2 to 2.2, S is equal to or less than 0.015, P is equal to or less than 0.020, Ni is 0.4 to 1.0, Cr is 0.1 to 0.5, Mo is 0.2 to 0.6, Ti is 0.06 to 0.2, and the rest is Fe and inevitable impurity elements. The welding wire provided by the invention has the advantages of simple chemical element design, small content of precious alloy elements and low crack sensitivity coefficient, and the deposited metal has the advantages of high intensity, excellent crack resistance and low-temperature shock toughness and excellent dynamic performance. The welding wire of the invention is suitable for the welding of low alloy structure steel with 600 to 800MPa tensile strength, which is applicable to engineering mechanics, heavy trucks, hydropower, coal power and other industries.
Description
Technical field
The invention belongs to field of welding material, more specifically, the present invention relates to the gas shielded arc welding wire material.
Background technology
Gas shielded arc welding technology is widely used in industrially developed country's manufacturing industry with its special advantages.The development of gas shield welding technology has greatly improved the manufacturing technology level of metal structure industry.Shielding Solid Welding Wire is a kind of high-tech welding material, and its generation has adapted to welding with development and produced the trend that develops to high-quality, high efficiency, automation, low cost, environment-friendly type direction.The development of the Shielding Solid Welding Wire of China starts from the fifties with exploitation, but rests on conceptual phase for a long time always, over nearly 10 years the development of this technology very fast, but with compare abroad that still there is a big difference.
Present China CO
2Shielding Solid Welding Wire has formed certain production scale, and output and quality also improve a lot, at the CO of structural steel such as Q235, Q345 and Q390
2Shielding Solid Welding Wire can satisfy the requirement that metal structure is made.The quality of solid welding wires such as 600MPa level high-strength steel, stainless steel, aluminium and aluminium alloy is also more stable.Yet the high-strength steel welding wire more than the 700MPa level, the development of heat resisting steel welding wire still are in bottleneck stage.Special steel grade solid welding wires such as 800MPa grade high-strength steel still mainly rely on import.
Along with development and national economy; the consumption of China's welding material is with sustainable growth; in order to develop China's Shielding Solid Welding Wire industry as early as possible; satisfy welding production demand better; the expert proposes to greatly develop the gas protecting welding wire kind; as 700MPa, 800MPa high strength welding wire etc., to satisfy welding production development requirement.
The present inventor has made preliminary search to magazine both domestic and external, proceeding, patent documentation etc., retrieves following 8 pieces of pertinent literatures altogether.
1.The?right?welding?wire?could?help?the?U.S.Navy?save?millions，Welding?Journal.Vol.78，No.6，pp.55-58，June?1999.
2.Consumables?for?welding?high?strength?steels，Svetsaren.Vol.54，no.1-2，pp.29-33.1999.
The chemical composition of the welding wire deposited metal of above-mentioned two non-patent literatures is as shown in table 1 below, is reduced to the chemical composition of bare wire, and its Ni content will be a bit larger tham listed numerical value in the table, might not contain the Ti element simultaneously or contain micro-Ti.
The chemical composition of the deposited metal of table 1 document 1,2 described welding wires
3. welding wire, application (patent) number: 89105436.7
4. welding wire for gas shielded welding, application (patent) number: 95108258.2
5. microtitanium-boron high-toughness gas protective welding stick, application (patent) number: 01128326.2
6. high-toughness gas protective welding wire for low alloy high-strength steel, application (patent) number: 01133651.X
7.WELDING?WIRE?FOR?LOW-Cr-CONTENT，HIGH-STRENGTH，HIGH-TOUGHNESS?HEAT-RESISTING?STEEL，PUB.NO.：2002-001579[JP?2002001579A].
8.GAS?SHIELD?ARC?WELDING?WIRE?FOR?LINE?PIPE，AND?GAS?SHIELD?ARC?WELDINGMETHOD?OF?LINE?PIPE?PERIMETER，PUB.NO.：2000-218391[JP?2000218391A].
The chemical composition of the welding wire deposited metal of above-mentioned document 3-8 is seen as following table 2.Wherein, document 3 and 4 described welding wires do not contain the Cr element, adopt expensive Ni, Mo element; Document 5 and 6 described welding wires contain the B element, do not contain the Mo element, though contain the mechanical property that the welding wire of B element can improve its deposited metal to a certain extent, it is big to smelt difficulty, and yield is low; Document 7 described welding wires belong to heat-resistance structural steel, contain than higher Cr; Document 8 described welding wires have certain corrosion resistance, contain Ni, the Cr of higher one-tenth, are mainly used in transferring oil, defeated natural gas line.
The chemical composition of the deposited metal of the described welding wire of table 2 document 3-8
Find that by above-mentioned preliminary search the high-strength steel solid welding wire refers to the welding wire that alloying component is higher mostly, is mainly used in the welding of structural steel such as heat resisting steel, stainless steel, 3.5Ni and 9Ni steel, but not low alloy steel welding wire.These high-strength welding wires improve intensity by adding a large amount of valuable alloying elements (Ni, Mo, B, Ti, Re etc.), though mechanical property reaches requirement, but higher alloying element content has not only improved production cost, has also increased the crackle sensitivity coefficient simultaneously, and is unfavorable to welding.Owing to these reasons, cause China still not have the demand that ripe 700MPa grade gas shielded welding commodity welding wire can not satisfy growing low-alloy high-strength steel gas shielded arc welding far away.
The present inventor has finally solved the supporting gas protecting welding wire problem of the low-alloy structural steel of tensile strength 700MPa, 800MPa, thereby has finished the present invention by constantly groping.
Therefore, first purpose of the present invention provides a kind of gas shielded arc welding wire rod.
First purpose of the present invention provides a kind of gas protecting welding wire.
The 3rd purpose of the present invention provides the application of this gas protecting welding wire in the low-alloy structural steel welding of tensile strength 600-800MPa.
Summary of the invention
The invention provides a kind of gas shielded arc welding wire rod; described welding wire wire rod comprises following component (wt%): C:0.03～0.12, Si:0.30～0.80; Mn:1.2～2.2; S :≤0.015, P :≤0.020, Ni:0.4～1.0; Cr:0.1～0.5; Mo:0.2～0.6, Ti:0.06～0.2, surplus is Fe and unavoidable impurities element.
The invention provides a kind of gas protecting welding wire; described welding wire comprises following component (wt%): C:0.03～0.12, Si:0.30～0.80; Mn:1.2～2.2; S :≤0.015, P :≤0.020, Ni:0.4～1.0; Cr:0.1～0.5; Mo:0.2～0.6, Ti:0.06～0.2, surplus is Fe and unavoidable impurities element.
The chemical composition of welding wire wire rod of the present invention, welding wire, the mechanism of its design is to utilize the refined crystalline strengthening of alloying element, phase transformation strengthening to improve intensity, utilizes the tissue of the peculiar tiny ferrite+bainite of deposited metal to improve its intensity and impact flexibility simultaneously; Good crack resistance mainly is to satisfy under the prerequisite of requirement of strength, adopts few alloying element to reduce the crackle sensitivity coefficient as far as possible.
Specifically, each chemical composition has following effect in welding wire wire rod provided by the invention and the welding wire:
C: be very effectively to harden and the solution strengthening constituent element, yet too high carbon content can promote the formation of high carbon martensite, also Chang Zuowei formation of crack appearance of carbide simultaneously increases weld metal cold crack sensitiveness, therefore the C content in the welding wire is controlled in the 0.01-0.05% scope.
Si: have deoxidation effect, when silicon exists with the form of solid solution attitude, can improve the yield strength of body, but the ductile-brittle transition temperature of material is improved, therefore the Si content in the welding wire is controlled in the 0.3-0.8% scope.
Mn: add as hardening element, also play the effect of deoxidation and desulfurization simultaneously, yet too high Mn content has caused the segregation of Mn, easily produce the M-A island structure in the line of segragation, thereby reduce the toughness of weld metal, therefore, Mn content in the welding wire is controlled in the 1.2-2.2% scope.
S, P butt welded seam metal low-temperature flexibility have damaging effect, should reduce S≤0.015%, P≤0.02% as far as possible.
Ni: be one of important element that improves toughness of material, it also is the essential element of stabilization of austenite, add nickel element the effect that reduces ductile-brittle transition temperature is arranged, there is reciprocation between the influence of Ni impact toughness and the Mn content, in the time of within two kinds of elements are positioned at best cooperation scope, corresponding weld metal has excellent obdurability coupling, therefore the addition of Ni is determined in the 0.4-1.0% scope.
Cr: have the effect of remarkable reinforced ferrite, yet too high Cr content can cause weld metal cold crack sensitiveness to increase, and therefore Cr content in the welding wire is controlled in the 0.1-0.5% scope.
Mo: be the essential element of solution strengthening, can improve weld strength and improve welding seam tissue capability that therefore the formation carbide easily yet Mo combines with other elements is controlled at Mo content in the welding wire in the 0.2-0.6% scope.
Ti: titanium elements can improve the anti-gas porosity of welding and improve low-temperature impact toughness, and Ti forms carbide, nitride and oxide easily, therefore Ti content in the welding wire is controlled in the 0.06-0.2% scope.
In a word, the chemical composition of welding wire of the present invention contains rational Ni, Cr, Mo, Ti content, does not contain microalloy elements such as B, Re, Nb, V.
Welding wire wire rod provided by the present invention and welding wire, its production process route are the conventional production process of gas shielded arc welding wire rod and welding wire.Wherein, the production technology of welding wire wire rod may further comprise the steps: 1) converter; 2) refining; 3) die casting; 4) steel ingot is rolling; 5) steel billet controlled rolling and controlled cooling; 6) weave silk; 7) collection volume; 8) check; 9) packing.The technological process of production of welding wire is: the 1) incoming test of wire rod; 2) the rough operation of pulling out; 3) copper facing operation; 4) finishing drawing operation; 5) bundling packaging process.
The present invention provides the application of this gas protecting welding wire in the low-alloy structural steel welding of tensile strength 600-800MPa on the other hand.
Beneficial effect:
Welding wire wire rod provided by the invention, welding wire, the chemical composition simplicity of design contains the consumption of less Ni, the valuable alloying element of Mo, and economy is improved, and the crackle sensitivity coefficient is minimized; Adopt the Ni-Cr-Mo-Ti system, make deposited metal both have higher intensity, have good crack resistance and low-temperature impact toughness and excellent mechanical property simultaneously again.
Welding wire provided by the present invention, yield strength 〉=600MPa; Tensile strength 〉=700MPa; Percentage elongation 〉=18%; Akv is respectively greater than 80J and 47J under-20 ℃ ,-40 ℃ conditions, can be used for the welding of the low-alloy structural steel of tensile strength 700MPa, strong coupling such as belong to, also can be used for the welding of the low-alloy structural steel of 600MPa and 800MPa, belong to high coupling and low slightly strong coupling respectively.Welding wire provided by the present invention can be applicable to following field: industries such as engineering machinery, heavy-duty car, water power, coal electricity.
The specific embodiment
The present invention is further elaborated with embodiment below, but these embodiment have any restriction to the present invention absolutely not.Any change that those skilled in the art are done in to the invention process under the enlightenment of this specification all will drop in the scope of claims.
Embodiment 1
Carry out the production of welding wire wire rod by composition design of the present invention, technical process comprises: 1) converter; 2) refining; 3) die casting; 4) steel ingot is rolling; 5) steel billet controlled rolling and controlled cooling; 6) weave silk; 7) collection volume; 8) check; 9) packing.The technological process of production of carrying out welding wire again is: the 1) incoming test of wire rod; 2) the rough operation of pulling out; 3) copper facing operation; 4) finishing drawing operation; 5) bundling packaging process.The chemical composition of gained welding wire deposited metal sees Table 3, and mechanical property sees Table 8.
The finished product chemical composition (wt%) of table 3 embodiment 1 welding wire
Embodiment 2
Production technology is identical with embodiment 1.The chemical composition of gained welding wire deposited metal sees Table 4, and mechanical property sees Table 8.
The finished product chemical composition (wt%) of table 4 embodiment 2 welding wires
Embodiment 3
Production technology is identical with embodiment 1.The chemical composition of gained welding wire deposited metal sees Table 5, and mechanical property sees Table 8.
The finished product chemical composition (wt%) of table 5 embodiment 3 welding wires
Embodiment 4
Production technology is identical with embodiment 1.The chemical composition of gained welding wire deposited metal sees Table 6, and mechanical property sees Table 8.
The finished product chemical composition (wt%) of table 6 embodiment 4 welding wires
Embodiment 5
Production technology is identical with embodiment 1.The chemical composition of gained welding wire deposited metal sees Table 7, and mechanical property sees Table 8.
The finished product chemical composition (wt%) of table 7 embodiment 5 welding wires
The mechanical property of the welding wire deposited metal of table 8 embodiment 1-7 welding wire
Annotate: during the deposited metal test, welding protection gas adopts 80%Ar+20%CO
2
A
Kv *Be the impact numerical value mean value of the deposited sample CVN test of five welding wires.
Claims (3)
1. gas shielded arc welding wire rod; it is characterized in that, comprise following component (wt%): C:0.03～0.12, Si:0.30～0.80; Mn:1.2～2.2; S :≤0.015, P :≤0.020, Ni:0.4～1.0; Cr:0.1～0.5; Mo:0.2～0.6, Ti:0.06～0.2, surplus is Fe and unavoidable impurities element.
2. the described wire rod of claim 1 draws the gas protecting welding wire that forms; it is characterized in that, comprise following component (wt%): C:0.03～0.12, Si:0.30～0.80; Mn:1.2～2.2; S :≤0.015, P :≤0.020, Ni:0.4～1.0; Cr:0.1～0.5; Mo:0.2～0.6, Ti:0.06～0.2, surplus is Fe and unavoidable impurities element.
3. the application of the described gas protecting welding wire of claim 2 in the low-alloy structural steel welding of tensile strength 600-800MPa.
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| CN102000925A (en) * | 2010-12-17 | 2011-04-06 | 中国船舶重工集团公司第七二五研究所 | Low-alloy welding wire for high-titanium low-molybdenum high-strength and high-toughness twin-wire submerged arc welding |
| CN102267020A (en) * | 2010-06-07 | 2011-12-07 | 鞍钢股份有限公司 | Metal powder core submerged arc welding wire with fire-resistant characteristic |
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| CN112247399A (en) * | 2020-11-19 | 2021-01-22 | 天津大桥焊丝有限公司 | 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire |
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