CN101524795B - Low-carbon high-nickel content 785 MPa grade gas shielded welding wire - Google Patents
Low-carbon high-nickel content 785 MPa grade gas shielded welding wire Download PDFInfo
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- CN101524795B CN101524795B CN2009100646728A CN200910064672A CN101524795B CN 101524795 B CN101524795 B CN 101524795B CN 2009100646728 A CN2009100646728 A CN 2009100646728A CN 200910064672 A CN200910064672 A CN 200910064672A CN 101524795 B CN101524795 B CN 101524795B
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Abstract
The invention belongs to the welding material field and mainly relates to low-carbon high nickel content 785 MPa grade gas shielded arc welding soldering wire which is used for high-tensile steel welding. The gas shielded arc welding soldering wire comprises components: 0.02-0.055% of C, less than or equal to 0.30% of Si, 0.6-0.9% of Mn, less than or equal to 0.80% of Cr, 6.8-8.0% of Ni, 0.45-0.60% of Mo, less than or equal to 0.035% of V, less than or equal to 0.075% of AI plus Ti, less than or equal to 0.04% of Re, and the rest of iron. The soldering wire adopts MIG welding, and can reach the following effects: (1) deposited metal and welding microstructure take bainite and martensite mixed microstructure as the main, have low phase transition temperature, can reduce the welding heat stress, thus reducing hydrogen induced cracking sensitivity; (2) deposited metal and welding microstructure contain a small quantity of remaining austenite and adverse transformation austenite; as this kind of austenite has high nickel content, moderate carbon content and strong stability, the austenite can become hydrogen trap to reduce diffusive hydrogen content and also can reduce the capability of diffusive hydrogen which assembles at the lower part of the last welding layer to form the hydrogen induced cracking through interlayer diffusion.
Description
Technical field
The invention belongs to field of welding material, relate generally to a kind of low-carbon (LC) high nickel content 785MPa grade gas shielded welding wire, be used for the high-strength steel welding.
Background technology
The MIG welding is the first-selected welding method of yield strength greater than the welding of 700MPa high strength steel, the MnNiCrMo welding wire of nickel (2～3%) content in the common adapted of this welding method, it typically is represented as the MIL120S that stipulates among the U.S. army mark MIL-E-23765-2E and the composition of MIL130S.Its advantage is: this alloy system uses in a large number and verifies, be organized as the middle temperature transformation tissue, contain more acicular ferrite, weld metal intensity plasticity toughness high comprehensive performance, its shortcoming is: when single track welding and multi-pass welding connect welding, the crack resistance problem of weld metal was more difficult to get solution.Its reason one is: weld metal phase transition temperature height can cause higher sweating heat stress, thereby increase the sensitiveness of hydrogen induced cracking; Its reason two is: weld seam is middle alloy content, in warm phase transformation meeting cause a certain amount of retained austenite to produce, austenite is strong hydrogen trap, improve favourable to crack resistance, but, in case this type of austenite can decompose under the timeliness of postwelding and action of pulling stress, wherein the hydrogen of Ju Jiing will promote the generation of local hydrogen induced cracking, can produce abominable effect.Under this background, the research of nickelic welding material comes into one's own, but nickelic welding material alloying element content height, the weld seam segregation is serious, very easily hardens, must be good fit between each alloying element.United States Patent (USP) 5523540 and 5744782 has all related to the nickelic welding material of low-carbon (LC), patent 5523540 composition ranges are too wide controversial, nickel content is lower than 4% in the patent 5744782, Chinese patent CN1413795 has related to nickelic low-carbon (LC) gas shield welding wire, be used for not preheating thermal weld without issue, its weld seam yield strength is on the low side (710～790MPa), and nickel content is all below 4%.
Summary of the invention
Be the weak point that material is welded in the gas shield that solves above-mentioned existing high strength steel, the present invention proposes the low-carbon (LC) high nickel content welding wire for gas shielded welding that a kind of weld seam yield strength reaches 785MPa.
For solving the problem of high-strength steel weld metal crack resistance difference; adopt the technology path development welding wire for gas shielded welding of low-carbon (LC) Langaloyization; ≤ 0.055% low-carbon (LC) can guarantee effectively that the carbon equivalent of weld metal is in low category; help improving its anti-crack ability; also be beneficial to and obtain the good relatively low-carbon martensite of toughness plasticity; 6.8～8.0% nickel content; can provide enough solution strengthening on the one hand; can reduce transformation temperature on the other hand; obtain stable retained austenite simultaneously and reverse to become austenite structure; further pass through the cooperation of the SiMnCrMo constituent content of optimization; can make weld structure remain martensite bainite line and staff control; and obtain further to strengthen its plasticity of while; toughness all is in good state.
Gas metal-arc welding component of weld wire proposed by the invention is: C:0.02～0.055%, Si≤0.30%, Mn:0.6～0.9%, Cr :≤0.80%; Ni:6.8～8.0%, Mo:0.45～0.60%, V≤0.035%; Al+Ti≤0.075%, Re≤0.040%, all the other are iron.
Carbon is in reduced levels, can reduce carbon equivalent, improves crack resistance and plasticity; Manganese silicon is to keep deoxidizing capacity and technological necessary factor, but must and Langaloy characteristics couplings use, should be in reduced levels, avoid occurring tissue based on martensite; Nickel is the core element that welding wire of the present invention embodies superior combination property, can reduce the Ms point significantly, acquisition low temperature phase change tissue, promote the formation of few stable retained austenite, its preferable content is between 6.8～8%, too high weld metal hardenability is too strong, and plasticity is poor, the advantage that then can not embody Langaloyization on the low side; An amount of interpolation chrome molybdenum element removes to have further strengthens function, and also can optimize tissue, obtains martensite bainite line and staff control form, and toughness is in higher level, and too much chrome molybdenum then can promote thick martensitic formation, worsens toughness.The vanadium of trace has a spot of precipitating reinforcing effect; The trace amount of titanium aluminium element improves arc energy density in order to improve welding procedure; ≤ 0.040% trace rare-earth element can improve welding procedure on the one hand, can reduce diffusible hydrogen content on the other hand; This composition welding wire is when adopting the MIG welding, arc stability, the deposited metal of acquisition or weld structure are martensite bainite and a small amount of austenite mixed tissue, and its yield strength is greater than 785MPa, have good crack resistance, can implement low preheating thermal weld without issue.
Welding wire MIG welding among the present invention has following characteristics:
1) seam organization is low-carbon martensite bainite and a small amount of austenite mixed tissue, excellent in strength and toughness, and yield strength is greater than 785MPa, and AKv-50 ℃ about 100J.
2) seam organization is the low-carbon martensite bainite, and phase transition temperature is low, and the martensite bainitic transformation has stress-induced effect, and this all helps reducing sweating heat stress.
3) in the single track welding under generation of nickelic retained austenite and the multiple tracks welding condition nickelic reverse turn austenitic generation, not only can improve toughness, can stablize the form of hydrogen trap simultaneously, increase substantially the crack resistance of weld metal.
These characteristics finally cause: adopt welding wire for gas shielded welding of the present invention to cooperate the MIG welding, weld seam is good mechanical performance not only, and has good cracking resistance, applicable to the low preheating thermal weld without issue of high-strength steel.
Welding wire of the present invention adopts the MIG welding, and can reach following effect: 1) deposited metal and seam organization are based on bainite and martensite line and staff control, and phase transition temperature is low, can reduce sweating heat stress, thereby reduces hydrogen induced cracking sensitiveness.2) contain a spot of retained austenite (in organizing cooling procedure, forming) and reverse in deposited metal and the seam organization and become austenite (forming) in multiple tracks welding interlayer region, because this type of austenitic content height, carbon content is moderate, has strong stability, can become hydrogen trap on the one hand and reduce the diffusible hydrogen amount, on the other hand, also can reduce diffusible hydrogen and be gathered in the ability that hydrogen induced cracking is formed at the cap weld bottom by inter-level diffusion.
Embodiment:
In the nickelic high-strength gas protecting welding wire composition range of low-carbon (LC) of the present invention, smelted 9 batches of welding wires altogether, constitute 9 groups of embodiment.Component of weld wire sees Table 1, and welding wire cooperates the performance of MIG welding deposited metal to see Table 2.The nickelic high-strength gas protecting welding wire of low-carbon (LC) of the present invention all adopts vacuum smelting furnace to smelt, to improve the degree of purity of welding wire.
Table 1 embodiment of the invention solder wire material chemical composition (wt%)
Table 2 embodiment of the invention welding wire MIG welds deposited metal mechanical property (wt%)
Claims (1)
1. low-carbon (LC) high nickel content 785MPa rank welding wire for gas shielded welding; it is characterized in that: described welding wire for gas shielded welding composition is: C:0.02～0.055%; Si≤0.30%, Mn:0.6～0.9%, Cr :≤0.80%; Ni:6.8～8.0%; Mo:0.45～0.60%, V≤0.035%, Al+Ti≤0.075%; Re≤0.040%, all the other are iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100646728A CN101524795B (en) | 2009-04-17 | 2009-04-17 | Low-carbon high-nickel content 785 MPa grade gas shielded welding wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100646728A CN101524795B (en) | 2009-04-17 | 2009-04-17 | Low-carbon high-nickel content 785 MPa grade gas shielded welding wire |
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| Publication Number | Publication Date |
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| CN101524795A CN101524795A (en) | 2009-09-09 |
| CN101524795B true CN101524795B (en) | 2011-06-22 |
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| CN2009100646728A Expired - Fee Related CN101524795B (en) | 2009-04-17 | 2009-04-17 | Low-carbon high-nickel content 785 MPa grade gas shielded welding wire |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992365B (en) * | 2010-12-20 | 2013-07-24 | 成都新大洋焊接材料有限责任公司 | High-strength and high-tenacity gas shielded welding wire |
| CN102114580B (en) * | 2011-01-26 | 2012-09-05 | 浙江大学 | Welding seam-strengthening MAG welding wire |
| CN103056550B (en) * | 2012-12-25 | 2016-03-09 | 中国船舶重工集团公司第七二五研究所 | A kind of welding wire for gas shielded welding of yield strength 900MPa rank |
| CN110732799A (en) * | 2019-08-05 | 2020-01-31 | 中国科学院金属研究所 | high-strength high-toughness argon tungsten-arc welding wire for 785 MPa-grade steel for ocean engineering and application thereof |
| CN110802344A (en) * | 2019-11-15 | 2020-02-18 | 中国科学院金属研究所 | 785 MPa-grade high-strength high-toughness consumable electrode active gas protection welding wire for ocean engineering and application thereof |
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Owner name: LUOYANG SHUANGRUI SPECIAL ALLOY MATERIAL CO., LTD. Free format text: FORMER OWNER: NO.725 INST. CHINA SHIPPING HEAVY INDUSTRY GROUP CORP. Effective date: 20140523 |
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Effective date of registration: 20140523 Address after: 471003 Henan Province, Luoyang city high tech Development Zone No. 20 road extension Patentee after: Luoyang Shuangrui Special Alloy Material Co., Ltd. Address before: 471039 No. 21, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee before: No.725 Inst. China Shipping Heavy Industry Group Corp. |
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