CN1274459C - High strength welding rod with excellent low-temperature toughness - Google Patents
High strength welding rod with excellent low-temperature toughness Download PDFInfo
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- CN1274459C CN1274459C CN 200410037809 CN200410037809A CN1274459C CN 1274459 C CN1274459 C CN 1274459C CN 200410037809 CN200410037809 CN 200410037809 CN 200410037809 A CN200410037809 A CN 200410037809A CN 1274459 C CN1274459 C CN 1274459C
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Abstract
The present invention relates to a welding electrode with excellent low temperature toughness and high strength, which belongs to the field of welding materials and is especially suitable for welding steel with yield strength larger than 780MPas. The high strength welding rod with excellent low temperature toughness is characterized in that the deposited metal of the welding electrode is composed of the following chemical components by weight percentage: 0.02 to 0.08% of C, 0.1 to 0.6% of Si, 0.5 to 1.6% of Mn, 2.9 to 6.9% of Ni, 0.01 to 0.6% of Cr, 0.01 to 0.39% of Mo, at most of Cu, 0.003 to 0.03% of Ti and Fe as the rest. Compared with the prior art, the welding electrode of the present invention has the advantage of simple and reasonable composition design. By adopting the welding electrode for welding, the yield strength and the low temperature toughness of the deposited metal can be effectively increased, and the welding electrode has good comprehensive mechanical properties.
Description
Technical field
The invention belongs to field of welding material.It is used greater than 780Mpa level steel to be specially adapted to welding buckling strength, has the welding rod of good low-temperature toughness and higher-strength.
Background technology
In the field of welding material of prior art, there is the data introduction can possess the welding material that good low-temperature toughness and higher-strength are arranged following several Entries are arranged: as CN1261299A; CN1413795A; CN1042680A; US6565678B2; US6114656A; Patent documentations such as US5523540 have been introduced different component of weld wire compositions and serviceability etc. respectively, but can have been found out that by article such patent all belongs to the welding wire for gas shielded welding material in these documents.In welding process, the deoxidant element titanium of welding wire, silicon, manganese etc. all have big scaling loss, and as the protective gas difference, then the scaling loss degree is also different, adopts CO
2Scaling loss degree during gas shielded arc welding is just welded far above the Ar gas shiled.For the foregoing reasons, the composition of welding wire is unsuitable for comparing with the deposited metal composition of welding rod.And " a kind of low-alloy high-strength and high-toughness welding rod " patent of invention that patent documentation CN1433869A is introduced, the yield strength of its deposited metal is the 785Mpa level, in this embodiment, the deposited metal mechanical property of welding rod is: σ
b=870Mpa; σ
0.2=815Mpa;-50 ℃ ballistic work Akv=59J ,-80 ℃ ballistic work Akv=37J.Though this welding rod has good strength character, it is compared with the steel of high-intensity high-tenacity, and it is relatively poor still to show low-temperature flexibility, so the mother metal of this welding rod and high-intensity high-tenacity coupling Use Limitation fruit is not ideal enough.
Summary of the invention
It is reasonable in design and can effectively improve the deposited gold of welding rod to the objective of the invention is to propose a kind of composition
The high strength stick electrode that belongs to low-temperature flexibility.
According to the object of the invention, the chemical component weight % that we propose to form the good high strength stick electrode deposited metal of low-temperature flexibility is: C 0.02-0.08%; Si 0.1-0.6%; Mn 0.5-1.6%; Ni2.9-6.9%; Cr 0.01-0.6%; Mo 0.01-0.39%; Cu 0.17-0.7%; Ti0.003-0.03%; All the other are Fe.In the deposited metal composition of welding rod of the present invention, we are described below respectively the qualification reason of each chemical element: in the composition of welding rod of the present invention, carbon has the effect that improves deposited metal intensity, to reducing its toughness and cracking resistance tangible effect is arranged all simultaneously, for the low-temperature flexibility that improves welding rod with improve cracking resistance, the content of carbon is unsuitable too high.But in the welding process, materials such as ferroalloy in core wire, the coating and carbonate all might be in deposited metal transition carbon, so carbon content answers strictness to be limited in the 0.02-0.08% scope.The silicon that adds in welding rod composition of the present invention is effective deoxidant element in the welding process, when the silicone content in the deposited metal less than 0.1% the time, deoxidation fully makes weld defects such as may producing pore in the weld seam; When silicon content surpassed 0.6%, then the low-temperature flexibility of butt welded seam had tangible infringement.Manganese element has good deoxidation and desulfurized effect, can improve the intensity of deposited metal effectively, when manganese content less than 0.5% the time, the intensity of deposited metal does not reach requirement, simultaneously also be unfavorable for preventing the generation of HOT CRACK FOR WELDING P, when manganese content greater than 1.6% the time, the toughness of deposited metal can reduce.Adding the effect of nickel in the composition of welding rod of the present invention, is the toughness of improving deposited metal by the crystal grain of refinement α phase, reduces its brittle transition temperature.When nickel content less than 2.9% the time, ballistic work does not reach instructions for use under the low temperature, but nickel content is greater than 6.9% o'clock, fire check sensitiveness then can increase.Have, chromium is the forming element of carbide again, and the intensity that improves material is had obvious effect, but low-temperature flexibility also there is tangible harmful effect, therefore, seeks out desirable low-temperature flexibility, chromium content should be controlled at below 0.6%, otherwise the toughness of deposited metal can worsen significantly.Adding molybdenum element does not have tangible harmful effect to low-temperature flexibility when improving the strength of materials, therefore, for reaching desired intensity and low-temperature flexibility, should control molybdenum content and be not more than 0.39%.Copper is the solution strengthening element, and it also can reduce the toughness of weld seam when improving weld strength, so the addition of copper should be controlled at 0.17-0.7%.Titanium is strong deoxidant element, and it and nitrogen have very strong affinity, and formed TiN particle can be used as nucleus, promotes the generation of acicular ferrite, has the effect that thinning microstructure improves toughness.But the transfer coefficient of titanium elements is very little, and by electrical arc erosion, in order to improve the low-temperature flexibility of welding rod of the present invention, the content of titanium elements should be controlled in the 0.003%-0.03% scope exhausted most titanium when welding.In welding rod composition of the present invention, sulphur, phosphorus all belong to the unfavorable element that deposited metal toughness is had very big harm, should reduce as far as possible.All the other are Fe.The high strength stick electrode that low-temperature flexibility of the present invention is good, its preparation method is similar to prior art, and it can adopt by coating and realize alloying, also can adopt by core wire and realize alloying.Steel ingot is smelted and cast to deposited metal alloying component by welding rod of the present invention, again through forging, rolling wire rod, the hot candied welding rod alloy core wire that becomes to set size.When adopting the coating alloying, use commercially available H08E core wire usually, on general oil pressure type electrode extrusion press, be pressed into welding rod, carry out low temperature drying and hyperthermia drying then.
Adopt the good high strength stick electrode of low-temperature flexibility of the present invention compared with prior art, has composition simplicity of design, reasonable, adopt this welding rod welding, can improve deposited metal yield strength and low-temperature flexibility effectively, deposited metal through facts have proved (seeing embodiment) welding rod of the present invention has good comprehensive mechanical property, and its tensile strength is greater than 850MPa; Yield strength is more than 800MPa; At-50 ℃ ballistic works greater than 74J; At-80 ℃ ballistic works greater than 49J.Aspect low-temperature flexibility be improved significantly.
The specific embodiment
The welding rod of the embodiment of the invention is by the core wire alloying or after partly core wire ten coatings are realized alloying, obtains having the deposited metal of good comprehensive mechanical property.We have smelted 2 stove steel altogether by the composition range requirement that the present invention sets, and steel ingot is swaged into the square billet of 110mm earlier, rerolls into the wire rod of φ 8mm, and being drawn into diameter at last is the alloy core wire of φ 4mm.The forging temperature of steel ingot is 1180 ℃, and final forging temperature is 850 ℃; Drawing passes is 5 passages.For realizing the coating alloying, we select the H08E wire rod of high-quality, and are drawn into the core wire that diameter is φ 4mm.Embodiment all lists table 1 in the concrete chemical composition of core wire.Embodiment covering of an electrode composition proportion sees Table 2; The preparation of welding rod is to be pressed into welding rod on common oil pressure type electrode extrusion press.Welding rod is used for test piece for welding behind the hyperthermia drying of 80 ℃ of low temperature dryings and 400 ℃.Welding is a low alloy steel plate with test plate (panel), and thickness is 20mm; The chemical composition of steel plate sees Table 3; Bevel for welding size, sample position and test method etc. are all implemented by the regulation of standard GB/T5118 (low-alloy steel electrode).The welding condition of the embodiment of the invention is as follows: dc source reversed polarity, welding current 150-160A; Arc voltage 23-24V; Weldering speed is 160-180mm/ minute; Between the road temperature 100-120 ℃.The chemical composition of welding rod deposited metal is listed table 4 in; The mechanical property of welding rod deposited metal is listed table 5 in.
Each cited in embodiments of the present invention table is respectively: table 1 is the concrete chemical composition contrast of the core wire of embodiment of the invention welding rod (weight %); Table 2 is the compositions of surfacing metal proportioning (weight %) of embodiment welding rod; Table 3 is the chemical composition (weight %) of embodiment with the low-alloy steel steel plate; Table 4 is the deposited metal composition (weight %) of embodiment welding rod; Table 5 is the deposited metal mechanical property of embodiment welding rod.Sequence number 1-3 is an embodiment of the invention welding rod in following each table, and sequence number 4 is the contrast welding rod of patent CN143869A.
The concrete chemical composition contrast of the core wire of table 1 embodiment of the invention welding rod (weight %)
The compositions of surfacing metal proportioning (weight %) of table 2 present embodiment welding rod
Table 3 present embodiment adopts the chemical composition (weight %) of low-alloy steel steel plate
| C | Si | Mn | Ni | Cr | Mo | Cu | Fe |
| 0.11 | 0.22 | 0.85 | 1.21 | 0.62 | 0.50 | 0.35 | Surplus |
The deposited metal composition (weight %) of table 4 present embodiment welding rod
The mechanical property of table 5 present embodiment welding rod deposited metal
Claims (1)
1, a kind of have a good high strength stick electrode of low-temperature flexibility, it is characterized in that the chemical component weight % that forms this welding rod deposited metal is: C 0.02-0.08%; Si 0.1-0.6%; Mn 0.5-1.6%; Ni 2.9-6.9%; Cr 0.01-0.6%; Mo 0.01-0.39%; Cu 0.17-0.7%; Ti0.003-0.03%; All the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037809 CN1274459C (en) | 2004-05-10 | 2004-05-10 | High strength welding rod with excellent low-temperature toughness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037809 CN1274459C (en) | 2004-05-10 | 2004-05-10 | High strength welding rod with excellent low-temperature toughness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1569386A CN1569386A (en) | 2005-01-26 |
| CN1274459C true CN1274459C (en) | 2006-09-13 |
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ID=34481757
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410037809 Expired - Fee Related CN1274459C (en) | 2004-05-10 | 2004-05-10 | High strength welding rod with excellent low-temperature toughness |
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| CN (1) | CN1274459C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395072C (en) * | 2006-03-28 | 2008-06-18 | 安泰科技股份有限公司 | Welding wire for welding high-strength and roughness structural steel |
| CN101288924B (en) * | 2007-04-20 | 2010-04-21 | 宝山钢铁股份有限公司 | Seawater corrosion resistance submerged arc welding wire rod, welding wire and application thereof |
| CN102962605A (en) * | 2012-11-16 | 2013-03-13 | 中国船舶重工集团公司第七二五研究所 | Low-carbon high-copper high-strength welding wire for gas protection welding |
| CN103878501A (en) * | 2013-11-29 | 2014-06-25 | 中国船舶重工集团公司第七二五研究所 | Metal-cored seamless flux-cored wire for high-strength steel |
| JP6255284B2 (en) * | 2014-03-10 | 2017-12-27 | 株式会社神戸製鋼所 | Solid wire for gas metal arc welding |
| CN106736031A (en) * | 2016-12-26 | 2017-05-31 | 首钢总公司 | A kind of steel welding rod |
| CN107598410B (en) * | 2017-09-27 | 2019-10-01 | 武汉铁锚焊接材料股份有限公司 | A kind of 90 feather weight high tensile steel electrodes |
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2004
- 2004-05-10 CN CN 200410037809 patent/CN1274459C/en not_active Expired - Fee Related
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| CN1569386A (en) | 2005-01-26 |
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Owner name: ANTAI SCIENCE AND TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: ANTAI SCIENCE AND TECHNOLOGY CO., LTD.; IRON AND STEEL RESEARCH GEUERAL INST. |
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Address after: 100081 No. 76 South College Road, Beijing, Haidian District Patentee after: Antai Science and Technology Co., Ltd. Address before: 100081 No. 76 South College Road, Beijing, Haidian District Co-patentee before: Central Iron & Steel Research Institute Patentee before: Antai Science and Technology Co., Ltd. |
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Granted publication date: 20060913 Termination date: 20160510 |