CN1433869A - Low-alloy high-strength high-toughness electric welding rod - Google Patents
Low-alloy high-strength high-toughness electric welding rod Download PDFInfo
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- CN1433869A CN1433869A CN03104883A CN03104883A CN1433869A CN 1433869 A CN1433869 A CN 1433869A CN 03104883 A CN03104883 A CN 03104883A CN 03104883 A CN03104883 A CN 03104883A CN 1433869 A CN1433869 A CN 1433869A
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Abstract
The present invention belongs to the field of welding material, in particular, it relates to an electric welding electrode prepared with low alloy material, and is applicable for welding high-strength high-toughness steel material whose yield strength is greater than 780MPa. The deposited metal chemical components formed into said electrode are: (wt%) C is less than or equal to 0.07%, Si is 0.1-0.6%, Mn is 1.0-1.6%, Ni is 2.6-3.8%, Cr is 0.01-0.40%, Mo is 0.66-1.2%, Ti is 0.003-0.03% and the rest is Fe. The deposited metal of said invented electrode has the good comprehensive mechanical property, its tensile strength is greater than 850 MPa, yield strength is above 785 MPa, and its impact power at -50 deg.C is greater than 55J, and impact power at -80 deg.C is greater than 32J.
Description
Technical field
The invention belongs to field of welding material.Particularly adopt the welding rod of low alloy material preparation, be applicable to the high-intensity high-tenacity steel grade of welding buckling strength greater than the 780Mpa level.
Background technology
In the field of welding material of prior art, be used for postwelding and pursue the welding material obtain high strength, high tenacity CN1120479A is arranged; CN1042680A; CN1200317A; Patent documentations such as US6114656A 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 gas and protects solder wire materials such as weldering, submerged-arc welding 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.And the composition of submerged-arc welding wire is also had any different with the composition of deposited metal, when adopting high silica flux, has the transition in deposited metal from solder flux of part silicon, so the silicone content in the welding wire should be lower than content in the deposited metal.Based on above-mentioned, the composition of welding wire is unsuitable for comparing with the deposited metal composition of welding rod.When being used in the manufacturing of large-sized structural parts such as boats and ships, pressure vessel as welding material,, bear dynamic loading because the steel plate that adopts mostly is high strength steel, use under the low temperature environment but also be everlasting, therefore, welding material is not only required to have high intensity, also will have good low-temperature flexibility.At present known high strength welding material (" the low-alloy steel welding master data handbook " of metallurgical industry publishing house publication in 1998) has: the mechanical property of the deposited metal of the special-purpose assorted welding rod of HQ100 steel is σ
s=859Mpa; σ
b=978Mpa;-40 ℃ ballistic work Akv=37J.The major defect of such welding rod is that low-temperature flexibility is poor, and is undesirable with the mother metal matching effect of high strength, high tenacity.
Goal of the invention and content
It is reasonable in design to the objective of the invention is to propose a kind of composition, can improve the low-alloy high-strength and high-toughness welding rod of welding rod deposited metal yield strength and low-temperature flexibility.
According to the object of the invention, the deposited metal composition (weight %) of the composition low-alloy high-strength and high-toughness welding rod that we proposed is: C≤0.07%; Si0.1-0.6%; Mn1.0-1.6%; Ni2.6-3.8%; Cr0.01-0.40%; Mo0.66-1.2%; 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 improving toughness and improving cracking resistance, the content of carbon should hang down as far as possible.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 should be limited in≤0.07%.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 infringement.Manganese element has good deoxidation and desulfurized effect, can improve the intensity of deposited metal effectively, when manganese content less than 1% the time, the intensity of deposited metal does not reach requirement, is unfavorable for preventing simultaneously the generation of HOT CRACK FOR WELDING P yet; When manganese content greater than 1.6% the time, the toughness of deposited metal can reduce.The nickel that adds in composition of the present invention can improve the toughness of deposited metal by the crystal grain of refinement α phase, reduces its brittle transition temperature; When nickel content less than 2.6% the time, ballistic work does not reach instructions for use under the low temperature, but nickel content is greater than 3.8% o'clock, fire check sensitiveness then can increase.Have, chromium is the forming element of carbide again, the intensity that improves material is had obvious effect, but low-temperature flexibility is also had tangible harmful effect, therefore will seek out desirable low-temperature flexibility, and chromium content should be controlled at below 0.4%.Adding molybdenum element does not have tangible harmful effect to low-temperature flexibility when improving the strength of materials, therefore, for reaching desired intensity, should control molybdenum content and be not less than 0.66%, but molybdenum content is higher than at 1.2% o'clock, can be unfavorable to the toughness of material.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 toughness 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.Sulphur in welding rod of the present invention, phosphorus all belong to the element that the toughness of deposited metal is had very big harm, should reduce as far as possible.All the other are Fe.The preparation of low-alloy high-strength and high-toughness welding rod of the present invention is same as the prior art, can adopt the welding rod that forms alloying by coating, also can adopt the welding rod that forms alloying by core wire.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, then through low temperature drying and hyperthermia drying.
Adopt low-alloy high-strength and high-toughness welding rod of the present invention compared with prior art, has composition simplicity of design, reasonable, adopt this welding rod to weld, can improve welding rod 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 785MPa; At-50 ℃ ballistic works greater than 55J; At-80 ℃ ballistic works greater than 32J.Aspect low-temperature flexibility, improve significantly.
The specific embodiment
Adopt the welding rod of the embodiment of the invention,, obtain having the deposited metal of good comprehensive mechanical property by the core wire alloying or after partly core wire ten coatings are realized alloying.We have smelted 3 stove steel altogether by the composition requirement of setting, 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.1180 ℃ of forging temperatures, final forging temperature are 850 ℃; Drawing passes is 5 passages.For realizing the coating alloying, we have selected the H08E wire rod of high-quality, and are drawn into the core wire that diameter is φ 4mm, and the concrete chemical composition of core wire is all listed table 1 in.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; Voltage 23-24V; Weldering speed is 150-160mm/ minute; Between the road temperature 120-130 ℃.The chemical composition of welding rod deposited metal is all 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 an embodiment covering of an electrode composition proportion (weight %); 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 1-6 is the embodiment of the invention in following each table, and sequence number 7 is a Comparative Examples.
The concrete chemical composition contrast of the core wire of table 1 embodiment of the invention welding rod (weight %)
Table 2 present embodiment covering of an electrode composition proportion (weight %)
Table 3 present embodiment adopts the chemical composition (weight %) of low-alloy steel steel plate
The deposited metal composition (weight %) of table 4 present embodiment welding rod
The mechanical property of table 5 present embodiment welding rod deposited metal
| ????C | ????Si | ????Mn | ????Ni | ????Cr | ????Mo | ????Cu | ???Fe |
| ????0.11 | ????0.22 | ????0.85 | ???1.21 | ????0.62 | ????0.50 | ????0.35 | Surplus |
Claims (1)
1, a kind of have deposited metal yield strength height and a good high-intensity high-tenacity welding rod of low-temperature flexibility, and the deposited metal composition (weight %) that it is characterized in that forming this welding rod is: C≤0.07%; Si0.1-0.6%; Mn1.0-1.6%; Ni2.6-3.8%; Cr0.01-0.40%; Mo0.66-1.2%; Ti0.003-0.03%; All the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031048838A CN1192851C (en) | 2003-02-21 | 2003-02-21 | Low-alloy high-strength high-toughness electric welding rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031048838A CN1192851C (en) | 2003-02-21 | 2003-02-21 | Low-alloy high-strength high-toughness electric welding rod |
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| Publication Number | Publication Date |
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| CN1433869A true CN1433869A (en) | 2003-08-06 |
| CN1192851C CN1192851C (en) | 2005-03-16 |
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|---|---|---|---|
| CNB031048838A Expired - Fee Related CN1192851C (en) | 2003-02-21 | 2003-02-21 | Low-alloy high-strength high-toughness electric welding rod |
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Cited By (6)
| 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 |
| CN101905389A (en) * | 2010-08-23 | 2010-12-08 | 武汉铁锚焊接材料股份有限公司 | Electrode for welding high-strength and high-toughness steel and preparation and application thereof |
| CN101920412A (en) * | 2010-09-07 | 2010-12-22 | 上海交通大学 | High-temperature resistant low alloy steel electrode coating and electrode thereof |
| CN102728966A (en) * | 2012-06-21 | 2012-10-17 | 中国船舶重工集团公司第七二五研究所 | Copper-containing high-strength high-toughness welding rod deposited metal |
| CN105436742A (en) * | 2015-12-12 | 2016-03-30 | 四川西冶新材料有限公司 | Hydroelectric 800 MPa low-alloy high-strength steel welded rod and preparation method thereof |
| CN106271201A (en) * | 2016-08-30 | 2017-01-04 | 北京智双科技发展有限公司 | A kind of for welding the tensile strength structural alloy steel submerged arc flux-cored wire more than 800MPa |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
2003
- 2003-02-21 CN CNB031048838A patent/CN1192851C/en not_active Expired - Fee Related
Cited By (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 |
| CN101905389A (en) * | 2010-08-23 | 2010-12-08 | 武汉铁锚焊接材料股份有限公司 | Electrode for welding high-strength and high-toughness steel and preparation and application thereof |
| CN101905389B (en) * | 2010-08-23 | 2012-07-18 | 武汉铁锚焊接材料股份有限公司 | Electrode for welding high-strength and high-toughness steel |
| CN101920412A (en) * | 2010-09-07 | 2010-12-22 | 上海交通大学 | High-temperature resistant low alloy steel electrode coating and electrode thereof |
| CN102728966A (en) * | 2012-06-21 | 2012-10-17 | 中国船舶重工集团公司第七二五研究所 | Copper-containing high-strength high-toughness welding rod deposited metal |
| CN105436742A (en) * | 2015-12-12 | 2016-03-30 | 四川西冶新材料有限公司 | Hydroelectric 800 MPa low-alloy high-strength steel welded rod and preparation method thereof |
| CN106271201A (en) * | 2016-08-30 | 2017-01-04 | 北京智双科技发展有限公司 | A kind of for welding the tensile strength structural alloy steel submerged arc flux-cored wire more than 800MPa |
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| Publication number | Publication date |
|---|---|
| CN1192851C (en) | 2005-03-16 |
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Owner name: ANTAI SCIENCE AND TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ANTAI SCIENCE AND TECHNOLOGY CO., LTD.; IRON AND STEEL RESEARCH GEUERAL INST. Effective date: 20071019 |
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Effective date of registration: 20071019 Address after: 100081 No. 76 South College Road, Beijing Patentee after: Antai Science and Technology Co., Ltd. Address before: 100081 No. 76 South College Road, Beijing Co-patentee before: Central Iron & Steel Research Institute Patentee before: Antai Science and Technology Co., Ltd. |
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Granted publication date: 20050316 Termination date: 20160221 |