CN1159133C - High-toughness welding wire adaptive for low carbon microalloy - Google Patents
High-toughness welding wire adaptive for low carbon microalloy Download PDFInfo
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- CN1159133C CN1159133C CNB021195919A CN02119591A CN1159133C CN 1159133 C CN1159133 C CN 1159133C CN B021195919 A CNB021195919 A CN B021195919A CN 02119591 A CN02119591 A CN 02119591A CN 1159133 C CN1159133 C CN 1159133C
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Abstract
The present invention relates to a high-toughness welding wire suitable for welding pipelines, containers and low-carbon micro-alloy steel requiring high impact toughness at a low temperature, etc., which belongs to the fields of material science and engineering. The welding wire comprises the following chemical components according to the proportion by weight: 0.01 to 0.12 of C, 0.6 to 2.3 of Mn, 0.10 to 0.40 of Si, less than 0.02 of P, less than 0.01 of S, 0.01 to 0.22 of Cr, 0.08 to 0.60 of Mo, 0.004 to 0.06 of V, 0.01 to 0.50 of Cu, 0.01 to 0.60 of Ni, 0.01 to 0.06 of Al, 0.02 to 0.08 of Nb, 0.01 to 0.20 of Ti, 0.0001 to 0.01 of B, 0.001 to 0.5 of Re and balance of Fe. The present invention satisfies the requirement of the submerged arc welding of pipelines, containers and steel requiring high impact toughness at a low temperature, etc. under the condition of high heat input by controlling the components of the welding wire. A weld joint has high toughness.
Description
Technical field
The invention belongs to the Materials Science and Engineering field.
Background technology
Oil, natural gas are one of modern main energy sources, and it is long apart from transfer oil, most economical, the rational means of transportation of natural gas that pipeline is carried.Main submerged arc ERW and the spiral welded pipe of adopting in big in the world now caliber pipe, high pressure oil transportation, the tracheae line field.Because the high security requirement that oil, tracheae line are carried require steel pipe to have high-strength tenacity, and weld seam and heat affected area is the weakest position, the performance, particularly toughness that therefore improve weld seam are the vital factors of pipeline safety.
The control of the toughness of weld seam and heat affected area is the emphasis of welding research always, and welding seam toughness is mainly controlled the content of acicular ferrite by the chemical composition of control weld seam corresponding circle of sensation, thereby reaches the purpose that improves welding seam toughness.This tissue of weld seam and performance be mainly by the composition of welding wire, solder flux, matrix material and welding procedure decision, and be one of most effectual way of control composition of weld line, tissue and performance by the chemical composition of welding wire.On the one hand, by increasing alloying element content, improve quenching degree, avoid or reduce the proeutectoid ferrite body burden, on the other hand, guarantee to have the content of a certain amount of promotion acicular ferrite nucleating metal oxide, as TiO, CeO etc., promote and refinement acicular ferrite structure.But too high alloying element content can cause taking place bainite transformation, reduces toughness.Though, more about the weld seam alloying element to the influence research of acicular ferrite, to different materials and welding procedure, lack clearly unified conclusion.Startup with the transfering natural gas from the west to the east project, the strength grade of domestic pipe line steel is brought up to X70 first, the grade of the steel of pipeline has enlarged a plurality of ranks such as X42～X70, and with the application of speed of welding and multifibres welding technology, the increase of sweating heat input quantity, the present domestic special-purpose submerged-arc welding wire that lacks at the different stage pipe line steel, and existing welding wire is difficult to satisfy the low-temperature impact toughness requirement of weld seam.
Summary of the invention
The purpose of this invention is to provide a kind of high-toughness welding wire that is applicable to low-carbon micro steel-alloy, this welding wire cooperates with HJ101, applicable to the needs that the high hot input quantity submerged-arc welding welding of low-carbon microalloy steel for pipeline steel pipe is produced, its weld seam can obtain high low-temperature impact toughness.
This high-toughness welding wire that is applicable to low-carbon micro steel-alloy is characterized in that: its chemical composition is that (wt%): C0.01～0.12, Mn0.6～2.3, Si0.10～0.40, P＜0.02, S＜0.01, Cr0.01～0.22, Mo0.08～0.60, V0.004～0.06, Cu0.01～0.50, Ni0.01～0.60, Al0.01～0.06, Nb0.02～0.08, Ti0.01～0.20, B0.0001～0.01, Re0.001～0.5, its surplus are Fe; The manufacturing process of welding wire is: adopt converter or basic electric furnace to smelt, be rolled into the dish circle of φ 6～φ 8, make the welding wire of φ 2.5～φ 5 through processing technologys such as pickling, cold-drawn, copper facing.
Welding wire chemical composition design principle is to adopt the mode of polynary composite alloying, thereby reaches the optimum Match of weld seam and mother metal, and promptly chemical analysis, physicochemical property performance are suitable, make the high combination of strength and toughness of weld seam acquisition.The present invention adopts existing smelting means, content by adjusting each alloy constituent element in steelmaking process is promptly: reduce P, S content, control C, Si, Mn, Cr, Ni, Cu content, add element modes such as Mo, Nb, Ti, V, B, obtain the multicomponent alloy steel of low P, S, C content, multicomponent alloy element, as solder wire material.When the welding wire chemical composition is composite, adopt the mode of polynary composite alloying to realize that good Strengthening and Toughening cooperates.Promptly improve toughness by reducing C content; Be used for guaranteeing acquisition high strength by transformation, reduction transition temperature, thinning microstructure and the solution strengthening etc. that add alloying elements inhibition pro-eutectoid ferrites such as Ni, Cu, Mo, B; Consider that under bigger hot input quantity condition penetration ratio increases the alloying process that reaches with the solder flux effect, suitably improve the Ti content of welding wire, guarantee that the Ti content in the weld seam can reach the best promotion of acquisition and the purpose of refinement acicular ferrite; In addition, reduce the content of field trash and improve the form of field trash by micro-Re, and further promote the formation of acicular ferrite, the tissue of refinement acicular ferrite by CeO, thereby reach under the hot input quantity condition of height, make weld seam obtain the purpose of good obdurability.The controlled quentity controlled variable of the various constituent element compositions of this multicomponent alloy solder wire material, the factor such as mix of some element when the scaling loss, solder flux of having considered welding wire some element in welding process participates in reaction.Like this, composition, tissue and the performance of the chemical Composition Control weld seam by welding wire on the one hand by alloying element content, improve quenching degree, avoid and reduce the content of pro-eutectoid ferrite; On the other hand, guarantee to have the content of a certain amount of promotion acicular ferrite nucleating metal oxide,, promote and refinement acicular ferrite structure as TiO, CeO etc.But, be not that alloying element content is high more good more, too high sometimes alloying element content can cause taking place bainite transformation, reduces toughness.
The specific embodiment
Following public is one embodiment of the present of invention, requires: weld strength σ
b〉=590MPa, A
Kv〉=120J (20 ℃).Chemical composition: C0.05, Mn1.08, Si0.25, P＜0.009, S＜0.005, Cr0.01, Mo0.20, V0.002, Cu0.20, Ni0.1, Al0.01, Nb0.03, B0.001, Ti0.03, Re0.01, its surplus add Fe.Adopt converter or basic electric furnace to smelt, the wire rod of φ 6mm is made in hot rolling, is processed into the welding wire of φ 2.5mm through pickling, draw, coating etc.
The welding wire that adopts above-mentioned chemical composition to make, according to API 5L.42 technical standard, use the SJ101 solder flux, the test plate (panel) that the X70 steel plate is done, two-sided monofilament weldering, weldering speed 1～1.2m/min, first weldingvoltage 30～35V, electric current 700～750A, second welding conditions such as voltage 35～40V, electric current 750～850A welded resulting weld seam, through checking: the weld seam Erichsen test the results are shown in Table 1, the low temperature impact properties result of the test sees Table 2, and weld seam acicular ferrite content is greater than 95, and the impact fracture section of shear (SA%) is greater than 95.As seen the weld metal zone has favorable tissue state and higher combination of strength and toughness.
The develop and spread of high-toughness welding wire involved in the present invention will and reduce cost etc. for the production domesticization of the developing acceleration welding material of China pipeline industry, brings into play its due effect.Simultaneously, its market space will be very wide also.
Table 1 Erichsen test result
| Sequence number | σ 0.5(Mpa) | σ b(Mpa) | δ(％) | Fracture site |
| 1 | - | 674 | - | Mother metal |
| 2 | - | 658 | - | Mother metal |
| 3 | - | 677 | - | Mother metal |
Table 2 low-temperature impact (20 ℃) performance test result
| Sequence number | A kv(J) | |||
| Single value | Mean value | |||
| 1 | 217 | 199 | 207 | 208 |
| 2 | 223 | 205 | 219 | 216 |
| 3 | 223 | 220 | 225 | 223 |
Claims (2)
1, a kind of welding wire that is applicable to the high tenacity of low-carbon micro steel-alloy is characterized in that: its chemical composition is that (wt%): C0.01～0.12, Mn0.6～2.3, Si0.10～0.40, P＜0.02, S＜0.01, Cr0.01～0.22, Mo0.08～0.60, V0.004～0.06, Cu0.01～0.50, Ni0.01～0.60, Al0.01～0.06, Nb0.02～0.08, Ti0.01～0.20, B0.0001～0.01, Re0.001～0.5, its surplus are Fe.
2, the manufacturing process of welding wire according to claim 1 is characterized in that: adopt converter or basic electric furnace to smelt, be rolled into the dish circle of φ 6～φ 8, make the welding wire of φ 2.5～φ 5 through processing technologys such as pickling, cold-drawn, copper facing.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021195919A CN1159133C (en) | 2002-05-30 | 2002-05-30 | High-toughness welding wire adaptive for low carbon microalloy |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021195919A CN1159133C (en) | 2002-05-30 | 2002-05-30 | High-toughness welding wire adaptive for low carbon microalloy |
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| CN1385279A CN1385279A (en) | 2002-12-18 |
| CN1159133C true CN1159133C (en) | 2004-07-28 |
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Cited By (2)
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| CN1321777C (en) * | 2005-03-25 | 2007-06-20 | 燕山大学 | Niobium-titanium-boron microalloy high-strength gas protecting welding wire |
| CN100460134C (en) * | 2006-05-29 | 2009-02-11 | 中国船舶重工集团公司第七二五研究所 | High strength and high toughness welding rod |
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| CN100469513C (en) * | 2007-09-12 | 2009-03-18 | 钢铁研究总院 | High-strength gas-defended welding wire material |
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2002
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321777C (en) * | 2005-03-25 | 2007-06-20 | 燕山大学 | Niobium-titanium-boron microalloy high-strength gas protecting welding wire |
| CN100460134C (en) * | 2006-05-29 | 2009-02-11 | 中国船舶重工集团公司第七二五研究所 | High strength and high toughness welding rod |
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| CN1385279A (en) | 2002-12-18 |
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