CN100460134C - High strength and high toughness welding rod - Google Patents
High strength and high toughness welding rod Download PDFInfo
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- CN100460134C CN100460134C CNB2006100178476A CN200610017847A CN100460134C CN 100460134 C CN100460134 C CN 100460134C CN B2006100178476 A CNB2006100178476 A CN B2006100178476A CN 200610017847 A CN200610017847 A CN 200610017847A CN 100460134 C CN100460134 C CN 100460134C
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Abstract
The present invention belongs to the field of welding material technology, and especially a kind of high strength and high toughness welding rod with deposit metal comprising C not more than 0.10 wt%, Si 0.2-0.5 wt%, Mn 1.2-2.2 wt%, Ni 2.6-4.0 wt%, Cr not more than 0.5 wt% , Mo 0.6-1.2 wt%, Ti 0.010-0.050 wt% and Fe for the rest. The high strength and high toughness welding rod is used in welding high strength steel and can result weld seam with high strength, high toughness and high crack resistance. The weld seam has RP0.2 not lower than 950 MPa, Rm not lower than 1000MPa and Akv at -50deg.c not lower than 27. It is also suitable for low or no afterheat welding.
Description
Technical field
The invention belongs to the welding material technology, mainly propose a kind of high strength and high toughness welding rod.
Background technology
Through consulting related data, domestic high strength and high toughness welding rod kind seldom.The special-purpose assorted welding rod of HQ100 steel is a high strength electrode, and its deposited metal mechanical property is R
P0.2〉=859MPa, Rm 〉=1000MPa ,-40 ℃ of ballistic work A
Kv〉=37J, the yield strength of this welding rod deposited metal is on the low side.The high strength electrode that patent document CN1528555A is invented, its deposited metal R
P0.2〉=950MPa, Rm 〉=1000MPa ,-50 ℃ of ballistic work A
Kv〉=27J, the toughness of this welding rod is on the low side, high tenacity and high strength requirement in the time of can not fully satisfying some important steel constructions welding.
Summary of the invention
The purpose that the present invention proposes a kind of high strength and high toughness welding rod is by the optimization to the welding rod deposited metal composition, makes the comprehensive aspect of its intensity, toughness and cracking resistance be better than prior art, makes the welding rod deposited metal have good comprehensive mechanical properties.
Welding rod proposed by the invention is to have high strength toughness welding rod as-welded the use down, can be used for welding R
P0.2The high-tensile structural steel of 〉=950Mpa level, the percentage by weight of the deposited metal composition of welding rod of the present invention is: C≤0.10, Si0.2～0.5, Ni2.6～4.0, Mo0.6～1.2, Ti0.010～0.050, all the other are Fe; The percentage by weight of Cr≤0.4 in the deposited metal composition, the percentage by weight of Mn are 1.56～2.2.
In the deposited metal composition of welding rod of the present invention, qualification reason to each element is described below respectively: in the deposited metal of welding rod of the present invention, carbon is obvious to improving the deposited metal intensity effect, but its too high levels is to the weldability significant adverse, in order to obtain high-intensity weld metal, and have certain toughness and crack resistance, carbon content is limited to C≤0.10%.Silicon is effective deoxidant element in the welding process, when the silicone content of deposited metal less than 0.2% the time, deoxidation fully makes in the weld seam and may produce weld defects such as pore, slag inclusion; When silicone content surpassed 0.5%, then the low-temperature flexibility of butt welded seam metal had infringement.In addition, an amount of element silicon and other element are combined with and are beneficial to weld metal and obtain a certain amount of acicular ferrite, bainite, stable retained austenite tissue, help keeping the toughness of high strength weld metal.Manganese is good deoxidation and desulfurization element, can effectively improve the intensity of deposited metal, and when Mn＜1.2%, the intensity of deposited metal does not reach requirement, also is unfavorable for preventing simultaneously the generation of HOT CRACK FOR WELDING P; As Mn〉2.2% the time, deposited metal toughness is on the low side.The nickel that adds in the welding rod of the present invention can improve the toughness of deposited metal by reduction dislocation low temperature skid resistance, refinement α phase crystal grain, reduces its brittle transition temperature; When Ni＜2.6%, low-temperature impact work will obviously descend, as Ni〉4.0% the time, HOT CRACK FOR WELDING P control difficulty strengthens; Ni is important core element, be beneficial to the retained austenite of formation stabilizer pole in weld seam and reach malleableize and the purpose of improving crack resistance, 2.6～4% Ni and an amount of Mn content cooperate and are aided with other alloying element, can obtain the good high strength of toughness and be organized as B+M+A
R (few)Deposited metal, its R
P0.2〉=950MPa ,-50 ℃ of ballistic work averages reach 60J.Chromium is carbide former, the effect that improves deposited metal intensity is arranged, but its behavior of separating out complicated under the effect of multi-pass welding sweating heat has adverse influence to low-temperature flexibility and crack resistance, in order to obtain good low-temperature flexibility and crack resistance, the Cr element should be controlled at Cr≤0.5%.The Mo element also has certain harmful effect to low-temperature flexibility, crack resistance when improving intensity, in order to meet the requirements of intensity, should control the Mo element in 0.6～1.2% scope.Titanium is strong deoxidant element, and it and nitrogen, oxygen have very strong affinity, and formed TiN, TiO particle can be used as nucleus, and crystal grain thinning, the ferritic generation of promotion Bei Shi have the effect that improves toughness.In order to improve the toughness of welding rod of the present invention, the content of titanium elements is controlled in 0.010～0.050% the scope.Sulphur, P elements all have very big damaging effect to the toughness of deposited metal, so should reduce its content as far as possible.
Use welding rod weld high strength steel of the present invention, its weld strength, toughness and cracking resistance all are in good level.Its weld seam R
P0.2〉=950MPa, Rm 〉=1000MPa ,-50 ℃ of ballistic work A
Kv〉=27 (average is more than 40J) can adapt to low after heat or thermal weld without male offspring simultaneously.
The specific embodiment
High strength and high toughness welding rod of the present invention in conjunction with coating transition portion metal alloyization, has obtained the good deposited metal of comprehensive mechanical property by the core wire alloying.By the composition requirement of setting, smelted 2 stove steel altogether, through the wire rod of the Φ 8mm that casts, forges and be rolled into, being drawn into diameter at last is the alloy core wire of Φ 4mm then.The concrete chemical composition of core wire is all listed in table 1, and test covering of an electrode prescription sees Table 2 (carrying out further alloying by coating transition butt welded seam metal).The preparation of welding rod is to suppress on common oil pressure type electrode extrusion press, then through low temperature drying and hyperthermia drying.Again welding rod is supplied test piece for welding usefulness after 450 ℃ * 3h cures before the welding, welding is a low alloy steel plate with test plate (panel), and thickness is 20mm, and 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.Welding condition in the invention process process is as follows: dc source reversal connection polarity, weld heat input are 17～20KJ/cm; Temperature is 130～150 ℃ between the road.
Below listed each table be respectively: table 1 is the concrete chemical composition of welding rod core wire of the present invention (weight %); Table 2 is a covering of an electrode composition proportion of the present invention (weight %); The low alloy steel plate chemical composition (weight %) of table 3 for using in implementing; Table 4 is the deposited metal composition (weight %) of welding rod of the present invention; Table 5 is the deposited metal mechanical property of welding rod of the present invention.
The concrete chemical composition of core wire (weight %) of table 1 embodiment welding rod
| C | Si | Mn | Ni | Cr | Mo | Ti | Fe | |
| 1 | 0.071 | 0.40 | 1.61 | 3.36 | 0.020 | 0.50 | 0.040 | Surplus |
| 2 | 0.042 | 0.42 | 1.46 | 2.68 | 0.030 | 025 | 0.080 | Surplus |
Core wire that table 2 embodiment welding rod is used and the compositions of surfacing metal (weight %) that cooperates with it
The low alloy steel plate chemical composition of using among table 3 embodiment (weight %)
| C | Si | Mn | Ni | Cr | Mo | V | Fe |
| 0.11 | 0.25 | 0.58 | 4.78 | 0.56 | 0.43 | 0.06 | Surplus |
The deposited metal composition (weight %) of table 4 embodiment welding rod
| C | Si | Mn | Ni | Cr | Mo | Ti | Fe | |
| 1 | 0.086 | 0.26 | 1.56 | 3.6 | 0.40 | 0.84 | 0.040 | Surplus |
| 2 | 0.071 | 0.25 | 1.80 | 3.3 | 0.21 | 0.97 | 0.030 | Surplus |
| 3 | 0.065 | 0.30 | 2.04 | 2.65 | 0.36 | 0.75 | 0.010 | Surplus |
| 4 | 0.060 | 0.41 | 2.04 | 3.08 | 0.22 | 0.72 | 0.019 | Surplus |
| 5 | 0.100 | 0.29 | 1.75 | 2.93 | 0.23 | 0.74 | 0.036 | Surplus |
| 6 | 0.065 | 0.42 | 1.51 | 3.86 | 0.20 | 0.80 | 0.031 | Surplus |
| 7 | 0.076 | 0.33 | 1.72 | 3.24 | 0.25 | 1.10 | 0.049 | Surplus |
| 8 | 0.071 | 0.28 | 2.20 | 2.95 | 0.37 | 0.70 | 0.028 | Surplus |
| 9 | 0.065 | 0.48 | 1.25 | 4.0 | 0.36 | 0.80 | 0.015 | Surplus |
Annotate: deposited metal composition is by in the welding process, in core wire, the coating alloyed powder fusing and and coating between the final result decision of redox reaction.
The deposited metal mechanical property of table 5 embodiment welding rod
| R P0.2(MPa) | Rm(MPa) | A(％) | Z(％) | A KV-50℃(J) | |
| 1 | 990，995 | 1030，1040 | 18，18 | 67，66 | 58，61，56/58 |
| 2 | 950，955 | 1010，1020 | 17，18 | 65，66 | 55，69，59/61 |
| 3 | 945，965 | 1000，990 | 18，17 | 64，63 | 40，42，45/42 |
| 4 | 950，960 | 1000，1010 | 16.5，18 | 61，59 | 56，53，52/54 |
| 5 | 980，990 | 1040，1050 | 18，18 | 60，63 | 48，53，55/52 |
| 6 | 955，965 | 1013，1020 | 18.5，19 | 61，61 | 62，59，65/62 |
| 7 | 998，1010 | 1060，1090 | 17.5，18 | 57，60 | 51，58，58/56 |
| 8 | 975，990 | 1060，1100 | 18，18 | 58，60 | 45，50，49/48 |
| 9 | 965，975 | 1005，1020 | 18.5，18 | 59.5，62 | 60，58，66/61 |
Claims (1)
1. high strength and high toughness welding rod, the percentage by weight of the deposited metal composition of its welding rod is: C≤0.10, Si 0.2～0.5, and Ni 2.6～4.0, and Mo 0.6～1.2, and Ti 0.010～0.050, and all the other are Fe; It is characterized in that: the percentage by weight of Cr≤0.4 in the deposited metal composition, the percentage by weight of Mn are 1.56～2.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100178476A CN100460134C (en) | 2006-05-29 | 2006-05-29 | High strength and high toughness welding rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100178476A CN100460134C (en) | 2006-05-29 | 2006-05-29 | High strength and high toughness welding rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1857849A CN1857849A (en) | 2006-11-08 |
| CN100460134C true CN100460134C (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100178476A Expired - Fee Related CN100460134C (en) | 2006-05-29 | 2006-05-29 | High strength and high toughness welding rod |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103769771B (en) * | 2014-02-20 | 2015-10-21 | 南京信息工程大学 | Inorganic compounding waterglass high-intensity high-tenacity low alloy steel welding 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002331387A (en) * | 2001-05-07 | 2002-11-19 | Nippon Steel Corp | Welding wire for highly touch martensite based-stainless steel |
| CN1159133C (en) * | 2002-05-30 | 2004-07-28 | 燕山大学 | High-toughness welding wire adaptive for low carbon microalloy |
| CN1528555A (en) * | 2003-10-17 | 2004-09-15 | 安泰科技股份有限公司 | High-strength welding electrode |
| CN1192851C (en) * | 2003-02-21 | 2005-03-16 | 安泰科技股份有限公司 | Low-alloy high-strength high-toughness electric welding rod |
-
2006
- 2006-05-29 CN CNB2006100178476A patent/CN100460134C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002331387A (en) * | 2001-05-07 | 2002-11-19 | Nippon Steel Corp | Welding wire for highly touch martensite based-stainless steel |
| CN1159133C (en) * | 2002-05-30 | 2004-07-28 | 燕山大学 | High-toughness welding wire adaptive for low carbon microalloy |
| CN1192851C (en) * | 2003-02-21 | 2005-03-16 | 安泰科技股份有限公司 | Low-alloy high-strength high-toughness electric welding rod |
| CN1528555A (en) * | 2003-10-17 | 2004-09-15 | 安泰科技股份有限公司 | High-strength welding electrode |
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| CN1857849A (en) | 2006-11-08 |
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