CN103170763A - Welding rod special for nuclear power 20-control chrome steel - Google Patents
Welding rod special for nuclear power 20-control chrome steel Download PDFInfo
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- CN103170763A CN103170763A CN2013100251062A CN201310025106A CN103170763A CN 103170763 A CN103170763 A CN 103170763A CN 2013100251062 A CN2013100251062 A CN 2013100251062A CN 201310025106 A CN201310025106 A CN 201310025106A CN 103170763 A CN103170763 A CN 103170763A
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Abstract
The invention discloses a welding rod special for nuclear power 20-control chrome steel. The content of each element in deposited metal of the welding rod comprises: <=0.15wt% of C, <=0.75wt% of Si, <=1.60wt% of Mn, <=0.020wt% of P, <=0.020wt% of S, <=0.30wt% of Ni, 0.17-0.30wt% of Cr, <=0.30wt% of Mo, and <=0.20wt% of Cu. Compared with the prior art, the chemical components of the deposited metal of the welding rod special for the nuclear power 20-control chrome steel are close to those of the nuclear power 20-control chrome steel, mechanical property is better than an existing E5015 welding rod or equal to the existing E5015 welding rod, and therefore anti-FAC performance of a 20-control chrome steel welding line finished by the welding rod is improved notably, the quality of the 20-control chrome steel welding line of a nuclear power station is ensured in the process of operation, and the welding rod special for the nuclear power 20-control chrome steel has important significance to safe operation of a nuclear power unit.
Description
Technical field
The present invention relates to nuclear power 20 control chromium steel special welding materials, especially a kind of 20 control chromium steel welding rod special for special that can obviously reduce the FAC corrosion rate.
Background technology
Velocity of medium is high in the carrier pipe of nuclear power plant, flow large (be about thermoelectricity 1.7 ~ 1.9 times); can produce higher " Flow accelerated corrosion (the FAC) " phenomenon that causes of flowing velocity because of delivering vapor and water; be the carbon steel pipe inner surface under a large amount of, swiftly flowing carbonated drink are washed away; the oxide-film that inwall has defencive function comes off, attenuation, the phenomenon that steel matrix variation, annual corrosion rate are increased.May cause pipe explosion accident when the Flow accelerated corrosion phenomenon is serious, therefore need to improve the anti-carbonated drink erosion property of carrier pipe.
According to existing research data, in carbon steel, the corrosion rate of FAC depends on the factors such as medium temperature, flow velocity, pH value, electrode potential, tubing alloying element, thermodynamics, and wherein the tubing alloying element can solve by selecting steel grades.Show after deliberation, increase the corrosion rate that Cr content can obviously reduce FAC in carbon steel, " Cr% relation in reduction-steel relatively " result of the test shows, when the Cr content in carbon steel＞0.04%, FAC speed descends rapidly: the corrosion rate of pipe material Cr content≤0.04% time is higher, and corrosion rate is substantially suitable, is assumed to 1, along with the increase of Cr content, corrosion rate reduces gradually; When Cr content reached 0.2%, the relative velocity of corrosion was 0.2; When Cr content reached 1%, the relative velocity of corrosion was 0.045.20 control chromium steel are exactly the new steel grade than high resistance FAC performance of having of developing under this background, and its chemical composition and mechanical property are as shown in table 1, table 2.
Table 1,20 control chromium steel chemical component table/wt%
Table 2,20 control chromium steel mechanical property tables
The anti-FAC purposes of 20 control chromium steel also has the Cr elemental composition of certain content in the welding material deposited metal of requirement and its coupling, so that also have the Cr of certain content in weld metal, the weld metal of pipeline part also has anti-FAC ability like this.Due to the welding material special that does not also have at present to be complementary with 20 control chromium steel, so the E5015 welding rod that can only select chemical composition, mechanical property and 20 control chromium steel to approach in Construction of Nuclear Electricity carries out the welding of 20 control chromium steel.
The E5015 welding rod is for welding rod common 20, the welding of 16Mn steel, and its chemical composition, mechanical property are as shown in table 3.As can be seen from Table 3, the chromium constituent content in E5015 welding rod deposited metal is few, can not satisfy the welding requirements of 20 control chromium steel.
Table 3, E5015 welding rod chemical composition (wt%), mechanical property table
In view of this, the necessary welding rod special for special that provides a kind of chemical composition and mechanical property and 20 control chromium steel to mate fully.
Summary of the invention
The object of the invention is to: the welding rod special for special that provides a kind of chemical composition and mechanical property and 20 control chromium steel to mate fully, to guarantee the demand of nuclear power projects mass engineering construction and follow-up operation maintenance.
In order to realize the foregoing invention purpose, the inventor finds that in 20 control chromium steel welding rod special for special deposited metals, each element optimum content is respectively: C content≤0.15wt%, Si content≤0.75wt%, Mn content≤1.60wt%, P content≤0.020wt%, S content≤0.020wt%, Ni content≤0.30wt%, Cr content 0.17-0.30wt%, Mo content≤0.30wt%, Cu content≤0.20wt% through concentrating on studies and testing.
A kind of improvement as nuclear power 20 control chromium steel welding rod special for special of the present invention, described welding rod comprises heart yearn and the coating that is coated on heart yearn, and its heart yearn is the steel wire with following chemical composition: C content≤0.09wt%, Si content≤0.03wt%, Mn content 0.35-0.55wt%, P content≤0.020wt%, S content≤0.020wt%, Ni content≤0.30wt%, Cr content≤0.20wt%, Cu content≤0.020wt%.
As a kind of improvement of nuclear power 20 control chromium steel welding rod special for special of the present invention, the formula of described coating is as follows: carbonate 20-55wt%, fluoride 10-30wt%, silicate 5-20wt%, ferroalloy 10-30wt%, arc stabilizer 5-10wt%, binding agent 1-5wt%, other 3-8wt%.
As a kind of improvement of nuclear power 20 control chromium steel welding rod special for special of the present invention, in described welding rod deposited metal, the content of each element is respectively: C content 0.078wt%, Si content 0.45wt%, Mn content 0.98wt%, P content 0.019wt%, S content 0.012wt%, Ni content 0.073wt%, Cr content 0.29wt%, Cu content 0.033wt%, V content 0.008wt%, Al content 0.001wt%, Mo content are no more than 0.30wt%.
As a kind of improvement of nuclear power 20 control chromium steel welding rod special for special of the present invention, in described welding rod deposited metal, the content of each element is respectively: C content 0.067wt%, Si content 0.52wt%, Mn content 1.18wt%, P content 0.018wt%, S content 0.016wt%, Ni content 0.011wt%, Cr content 0.26wt%, Cu content 0.026wt%, V content 0.008wt%, Al content 0.001wt%, Mo content are no more than 0.30wt%.
As a kind of improvement of nuclear power 20 control chromium steel welding rod special for special of the present invention, in described welding rod deposited metal, the content of each element is respectively: C content 0.049wt%, Si content 0.50wt%, Mn content 1.14wt%, P content 0.018wt%, S content 0.014wt%, Ni content 0.011wt%, Cr content 0.26wt%, Cu content 0.025wt%, V content 0.008wt%, Al content 0.002wt%, Mo content are no more than 0.30wt%.
As a kind of improvement of nuclear power 20 control chromium steel welding rod special for special of the present invention, the specification of described welding rod is Φ 2.6, Φ 3.2 or Φ 4.0.
Compared with prior art, chemical composition and the 20 control chromium steel of nuclear power 20 control chromium steel welding rod special for special deposited metals of the present invention are more approaching, mechanical property also is better than existing E5015 welding rod or suitable with existing E5015 welding rod, therefore use the anti-FAC performance of its 20 control chromium steel weld seams of completing to be significantly increased, guaranteed the quality of nuclear power station 20 control chromium steel weld seams in the operation process, significant to the safe operation of nuclear power generating sets.As seen, nuclear power 20 control chromium steel welding rod special for special of the present invention efficiently solve at present and do not control with 20 the welding material problem that chromium steel are complementary.
The specific embodiment
In order to make purpose of the present invention, technical scheme and useful technique effect thereof more clear, below in conjunction with the specific embodiment, the present invention is further elaborated.Should be understood that, the specific embodiment of describing in this specification is only in order to explain the present invention, is not in order to limit the present invention.
In order to coordinate with 20 control chromium steel, the inventor has drawn the design load of chemical composition, mechanical property, heart yearn chemical composition and the coating recipe of nuclear power 20 control chromium steel welding rod special for special deposited metals of the present invention, as shown in table 4-7 through many experiments.
Table 4,20 control chromium steel welding rod special for special deposited metal composition design load/wt%
Table 5,20 control chromium steel welding rod special for special deposited metal mechanical property design loads
Table 6,20 control chromium steel welding rod special for special heart yearn Design of Chemical Composition value/wt%
| The trade mark | C | Si | Mn | P | S | Ni | Cr | Cu |
| 20 control chromium heart yearns | ≤0.09 | ≤0.03 | 0.35-0.55 | ≤0.020 | ≤0.020 | ≤0.30 | ≤0.20 | ≤0.020 |
According to role in welding process, coating component can be divided into usually by effect:
1) arc stabilizer: Main Function is the stability of improving the striking performance of welding rod and improving welding arc, all materials that gas ionization is reduced, can improve the stability of electric arc, the general compound that contains alkali and alkaline earth metal ions that adopts is as the compound of potassium, sodium, calcium; The present invention 20 control chromium electrode coating arc stabilizers can be from potash, sodium carbonate, niter, waterglass and marble or lime stone, granite, feldspar, titanium dioxide etc.;
2) slag former: Main Function is to form the slag with certain physics, chemical property, produces good mechanical protection effect and Metallurgical processing effect; The present invention's 20 control chromium electrode coating slag formers can be from ilmenite, bloodstone, rutile, feldspar, marble, granite, fluorite, magnesia, violent ore deposit, titanium dioxide etc.;
3) gas-forming agent: Main Function is to cause protective atmosphere, also is conducive to the droplet transfer simultaneously; The gas-forming agent constituent of the present invention's 20 control chromium electrode coatings can be from carbonate mineral (as marble, magnesite, dolomite etc.) and organic matter (as wood powder, cellulose, starch etc.);
4) deoxidier: Main Function is to slag and weld metal deoxidation; The present invention's 20 control chromium coating deoxidier constituents can be from ferromanganese, ferrosilicon, ferro-aluminum, ferrotianium, graphite etc.;
5) alloying constituent: Main Function is to infiltrate necessary alloying component in the weld metal, with the alloying element that compensates scaling loss or evaporation and the alloying element of adding property; The component of the present invention's 20 control chromium electrode coating alloying constituents mainly considers to use evanohm, manganese alloy;
6) diluent: Main Function is the viscosity that reduces welding slag, increases the mobility of slag; The component of the present invention's 20 control chromium electrode coating diluents can be from fluorite, feldspar, ilmenite, titanium dioxide, rutile, manganese ore etc.;
7) bonding agent: Main Function is that noisy strand of coating the is bonded on core wire; The do for oneself material etc. of waterglass, natural gum and so on of the present invention 20 control chromium electrode coating adhesive component;
8) plasticizer: Main Function is plasticity and the slip of improving coating, makes it to be easy to mechanical extrusion on core wire; The component of the present invention's 20 control chromium electrode coating plasticizer can be from mica, white clay, titanium dioxide etc.
In the welding rod coating recipe design; need according to the effect of coating when welding; consider the many factors such as the gas slag Combined Protection effect of coating and welding rod operability as a whole, the coating recipe design load of table 7 for being used in conjunction with nuclear power 20 control chromium steel welding rod special for special heart yearns of the present invention.
Table 7,20 control chromium steel welding rod special for special coating recipe design loads
| Title | Carbonate | Fluoride | Silicate | Ferroalloy | Arc stabilizer | Binding agent | Other |
| Mass fraction (%) | 20-55 | 10-30 | 5-20 | 10-30 | 5-10 | 1-5 | 3-8 |
After tested, three kind of 20 control chromium steel welding rod special for special deposited metal composition producing according to the above-mentioned design load of the present invention and mechanical property thereof are as shown in table 8-9.
Table 8, each embodiment welding rod deposited metal composition test result/wt%
| Embodiment | C | Si | Mn | P | S | Ni | Cr | Cu | V | Al | Mo |
| Φ2.6 | 0.078 | 0.45 | 0.98 | 0.019 | 0.012 | 0.073 | 0.29 | 0.033 | 0.008 | 0.001 | Trace, and be no more than 0.30 |
| Φ3.2 | 0.067 | 0.52 | 1.18 | 0.018 | 0.016 | 0.011 | 0.26 | 0.026 | 0.008 | 0.001 | Trace, and be no more than 0.30 |
| Φ4.0 | 0.049 | 0.50 | 1.14 | 0.018 | 0.014 | 0.011 | 0.26 | 0.025 | 0.008 | 0.002 | Trace, and be no more than 0.30 |
Table 9, each embodiment welding rod deposited metal mechanical experimental results
Compared with prior art, chemical composition and the 20 control chromium steel of nuclear power 20 control chromium steel welding rod special for special deposited metals of the present invention are more approaching, mechanical property also is better than existing E5015 welding rod or suitable with existing E5015 welding rod, therefore use the anti-FAC performance of its 20 control chromium steel weld seams of completing to be significantly increased, guaranteed the quality of nuclear power station 20 control chromium steel weld seams in the operation process, significant to the safe operation of nuclear power generating sets.As seen, nuclear power 20 control chromium steel welding rod special for special of the present invention efficiently solve at present and do not control with 20 the welding material problem that chromium steel are complementary.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the specific embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the present invention just for convenience of description.
Claims (7)
1. a nuclear power 20 is controlled the chromium steel welding rod special for special, and it is characterized in that: in described welding rod deposited metal, the content of each element is respectively: C content≤0.15wt%, Si content≤0.75wt%, Mn content≤1.60wt%, P content≤0.020wt%, S content≤0.020wt%, Ni content≤0.30wt%, Cr content 0.17-0.30wt%, Mo content≤0.30wt%, Cu content≤0.20wt%.
2. nuclear power 20 according to claim 1 is controlled the chromium steel welding rod special for special, it is characterized in that: described welding rod comprises heart yearn and the coating that is coated on heart yearn, and heart yearn is the steel wire with following chemical composition: C content≤0.09wt%, Si content≤0.03wt%, Mn content 0.35-0.55wt%, P content≤0.020wt%, S content≤0.020wt%, Ni content≤0.30wt%, Cr content≤0.20wt%, Cu content≤0.020wt%.
3. nuclear power 20 according to claim 2 is controlled the chromium steel welding rod special for special, and it is characterized in that: the formula of described coating is as follows: carbonate 20-55wt%, fluoride 10-30wt%, silicate 5-20wt%, ferroalloy 10-30wt%, arc stabilizer 5-10wt%, binding agent 1-5wt%, other 3-8wt%.
4. nuclear power 20 according to claim 1 is controlled the chromium steel welding rod special for special, and it is characterized in that: in described welding rod deposited metal, the content of each element is respectively: C content 0.078wt%, Si content 0.45wt%, Mn content 0.98wt%, P content 0.019wt%, S content 0.012wt%, Ni content 0.073wt%, Cr content 0.29wt%, Cu content 0.033wt%, V content 0.008wt%, Al content 0.001wt%, Mo content are no more than 0.30wt%.
5. nuclear power 20 according to claim 1 is controlled the chromium steel welding rod special for special, and it is characterized in that: in described welding rod deposited metal, the content of each element is respectively: C content 0.067wt%, Si content 0.52wt%, Mn content 1.18wt%, P content 0.018wt%, S content 0.016wt%, Ni content 0.011wt%, Cr content 0.26wt%, Cu content 0.026wt%, V content 0.008wt%, Al content 0.001wt%, Mo content are no more than 0.30wt%.
6. nuclear power 20 according to claim 1 is controlled the chromium steel welding rod special for special, and it is characterized in that: in described welding rod deposited metal, the content of each element is respectively: C content 0.049wt%, Si content 0.50wt%, Mn content 1.14wt%, P content 0.018wt%, S content 0.014wt%, Ni content 0.011wt%, Cr content 0.26wt%, Cu content 0.025wt%, V content 0.008wt%, Al content 0.002wt%, Mo content are no more than 0.30wt%.
7. nuclear power 20 according to claim 1 is controlled the chromium steel welding rod special for special, and it is characterized in that: the specification of described welding rod is Φ 2.6, Φ 3.2 or Φ 4.0.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103722306A (en) * | 2013-12-12 | 2014-04-16 | 四川大西洋焊接材料股份有限公司 | Nuclear grade non-strong radiation area low alloy steel electrode and manufacturing method thereof |
| CN105108373A (en) * | 2015-06-09 | 2015-12-02 | 中广核工程有限公司 | Special welding rod for on-site welding main steam pipe in nuclear power station |
| CN105583549A (en) * | 2016-03-09 | 2016-05-18 | 苏州新普新材料科技有限公司 | Welding rod special for nuclear power 20# chromium controlled steel |
| CN105618956A (en) * | 2016-03-09 | 2016-06-01 | 苏州新普新材料科技有限公司 | Production method for welding rod special for nuclear power 20 control chromium steel |
| CN105665962A (en) * | 2016-04-26 | 2016-06-15 | 孙宁 | Welding rod special for corrosion-resisting steel welding |
| CN105665969A (en) * | 2016-04-26 | 2016-06-15 | 孙宁 | Manufacturing method of welding rod special for corrosion-resisting steel welding |
| CN107322193A (en) * | 2017-08-30 | 2017-11-07 | 苏州新普新材料科技有限公司 | A kind of preparation method of welding rod |
| CN108436325A (en) * | 2018-03-21 | 2018-08-24 | 济南市热力工程公司 | A kind of low dirt low-hydrogen welding rod and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103722306B (en) * | 2013-12-12 | 2015-10-28 | 四川大西洋焊接材料股份有限公司 | A kind of non-strong irradiated site low-alloy steel electrode of core level and manufacture method thereof |
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| CN105618956B (en) * | 2016-03-09 | 2018-06-29 | 苏州新普新材料科技有限公司 | A kind of nuclear power 20 controls the production method of chromium steel welding rod special for special |
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| CN105665969B (en) * | 2016-04-26 | 2018-06-01 | 惠安科培工业设计有限公司 | A kind of production method of corrosion-resisting steel welding welding rod special for special |
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| CN105665962B (en) * | 2016-04-26 | 2018-06-29 | 泉州市名典工业设计有限公司 | A kind of corrosion-resisting steel welds welding rod special for special |
| CN107322193A (en) * | 2017-08-30 | 2017-11-07 | 苏州新普新材料科技有限公司 | A kind of preparation method of welding rod |
| CN108436325A (en) * | 2018-03-21 | 2018-08-24 | 济南市热力工程公司 | A kind of low dirt low-hydrogen welding rod and preparation method thereof |
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