CN101628365A - Low-nickel type steel casting repair-welding electrowelding rod - Google Patents
Low-nickel type steel casting repair-welding electrowelding rod Download PDFInfo
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- CN101628365A CN101628365A CN200910101584A CN200910101584A CN101628365A CN 101628365 A CN101628365 A CN 101628365A CN 200910101584 A CN200910101584 A CN 200910101584A CN 200910101584 A CN200910101584 A CN 200910101584A CN 101628365 A CN101628365 A CN 101628365A
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Abstract
The invention belongs to the field of welding materials, in particular to a low-nickel type steel casting repair-welding electrowelding rod. The electrowelding rod comprises the following fused metal chemical components in percentage by weight: 0.15-0.25 percent of C, 0.030 percent of S, at most 0.55 percent of Si, 1.20-1.40 percent of Mn, 0.030 percent of P; 0.30-0.60 percent of Cr, at most 1.0 percent of Ni, 0.15-0.30 percent of Mo, at most 0.05 percent of V and at most 0.50 percent of Cu. The invention reduces the production cost on the premise of meeting the quality of products, widens the welding field of large steel castings and is particularly suitable for the repair welding of the large steel castings in a petroleum drilling industry. The invention has favorable welding performance, smooth and attractive welding line joint, simple manufacture method, low cost and convenient operation and can improve the matching performance of the steel castings during welding.
Description
Technical field
The invention belongs to field of welding material, be specifically related to a kind of low-nickel type steel casting repair-welding electrowelding rod.
Background technology
Along with the fast development of metal manufacturing and secondary industry, to the also raising day by day of product technology requirement of the used welding rod of welding procedure.Usually, the soldering amounts of steel-casting before modified such as the large-scale preventer housing of bulk petroleum industry use, side door, cowl hood are bigger.In the steel-casting welding repair process, not only process for welding repair condition, process and welder will satisfy corresponding standard and requirement, and wlding also must satisfy the requirement of postwelding composition, hardness requirement, mechanical property requirements, cracking resistance requirement etc.
In addition, along with the development need of offshore oil exploitation, building marine large-scale petroleum drilling platforms can get more and more, can constantly increase the demand of large-scale steel-casting, therefore to the wlding demand that matches with it also in continuous increase.At present, the process for welding repair of this type of steel-casting generally can adopt the Chemtron4130-LN welding rod of ESAB company, but this production cost height, cost an arm and a leg, what is more important, as oil, the very important large-scale steel-casting production of pressure vessel industries, big to welding materials demand amount, the performance requirement height, also relatively more responsive to cost, so a kind of welding rod that has only high price at present is applicable to the situation of production, be unfavorable for very much the development of enterprise and industry, also do not meet the long term growth strategy of economic construction.Therefore, development low cost, high performance this type of steel-casting repair welding wlding are very necessary.
Find through literature search, in existing steel casting repair-welding electrowelding rod patent, do not find low-nickel type steel casting repair-welding electrowelding rod as yet prior art.Though the welding rod product is a lot of both at home and abroad at present, but corresponding target material is arranged all separately, most generally speaking welding rod Ni content are generally greater than 1.0%, therefore except the expensive welding rod Chemtron4130-LN of known ESAB company, there is not ready-made low-cost welding rod directly can satisfy the requirement of petroleum industry large-scale steel-casting soldering.General cast steel wlding ubiquity mother metal and wlding hardness can not be harmonious shortcoming.For example, the THJ657RH welding rod is when welding, and strength of joint and toughness aspect all can not meet the demands.
Summary of the invention
The object of the invention is the deficiency at existing large-scale steel-casting repair welding welding rod, reach drawbacks such as external welding rod costs an arm and a leg, a kind of low-nickel type steel casting repair-welding electrowelding rod is provided, so that under the prerequisite that satisfies the product quality requirement, reduce production costs, strengthen the economic benefit and the international competitiveness of petroleum drilling and mining industry.It has good welding performance, the matching in the time of can improving the steel-casting welding, and welding line joint is smooth, attractive in appearance, and manufacture method is simple, and is with low cost, and easy to operate.
The present invention realizes the technical scheme that above-mentioned purpose adopts.This low-nickel type steel casting repair-welding electrowelding rod is by analysis and research welding technological properties and physical characteristic, through proportioning test repeatedly, and the actual welding experiment, optimize composition, develop low-nickel type steel casting repair-welding electrowelding rod.Its percentage by weight of forming the deposited metal chemical analysis of this welding rod is: C, 0.15-0.25%; S, 0.030%; Si ,≤0.55%; Mn, 1.20-1.40%; P, 0.030%; Cr, 0.30-0.60%; Ni ,≤1.0%; Mo, 0.15-0.30%; V ,≤0.05%; Cu ,≤0.50%.
The present invention has quite outstanding advantage and good effect:
(1) rational formula rate makes that welding bead is smooth, complete penetration, fusion is good, and open defects such as no slag inclusion, pore, macroscopic cracking have guaranteed good welding technological properties.
(2) the present invention has filled up a blank of low-nickel type steel casting repair-welding electrowelding rod, and has widened the welding field of large-scale steel-casting.
(3) this welding rod not only is exclusively used in the welding of large-scale steel-casting, can be used for the welding of equivalent material member equally, has very high practical value.
(4) the present invention can directly apply to the production of enterprise's large-scale steel-casting, help enterprise enhance productivity, reduce cost.
(5) the present invention will eliminate because many unfavorable factors that import produces will produce indirect economic benefit.Simultaneously, can break this situation that is limited by foreign enterprise, help strengthening the international competitiveness of China enterprise, more help the development of China's oil manufacturing.
In sum, research of the present invention not only can bring direct and indirect economic benefit with application, also can produce remarkable social benefit.
The specific embodiment:
The invention will be further described below in conjunction with specific embodiment: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
Welding is an ASTM A487 GRAD9 steel plate with test plate (panel) (being mother metal), and the monolithic test plate (panel) is of a size of 45 * 200 * 700 (mm), and its chemical composition (Wt%) and mechanical performance see Table 1 and table 2 respectively.Edge planer digs groove, and its groove size, sample position and test method etc. are all implemented by the regulation of standard GB/T5118.The mechanical performance of test plate (panel) is shown in Table 3.
Each cited in example of the present invention table is respectively: table 1 is the chemical composition (Wt%) of present embodiment test plate (panel) (being mother metal) ASTM A487GRAD9; Table 2 is the mechanical performance of present embodiment test plate (panel) (being mother metal) ASTM A487 GRAD9; Table 3 is the mechanical performance of present embodiment test plate (panel)
Embodiment 1
A kind of low-nickel type steel casting repair-welding electrowelding rod, its deposited metal chemical analysis (weight %) is:
C、0.15％；S、0.030％；Si、0.55％；Mn、1.20％；P、0.030％；Cr、0.30％；Ni、1.0％；Mo、0.15％；V、0.05％；Cu、0.50％。After the test plate (panel) welding, carried out infiltration and ultrasonic examination, do not found that all the crack exists, and illustrates that the crack resistance of joint is better.The observation of the macro surface of sample weld seam: welding bead is smooth, complete penetration, fusion are good, open defects such as no slag inclusion, pore, macroscopic cracking.
Embodiment 2
A kind of low-nickel type steel casting repair-welding electrowelding rod, its deposited metal chemical analysis (weight %) is: C, 0.20%; S, 0.030%; Si, 0.55%; Mn, 1.30%; P, 0.030%; Cr, 0.45%; Ni, 1.0%; Mo, 0.22%; V, 0.05%; Cu, 0.50%.After the test plate (panel) welding, carried out infiltration and ultrasonic examination, do not found that all the crack exists, and illustrates that the crack resistance of joint is better.The observation of the macro surface of sample weld seam: welding bead is smooth, complete penetration, fusion are good, open defects such as no slag inclusion, pore, macroscopic cracking.
Embodiment 3
A kind of low-nickel type steel casting repair-welding electrowelding rod, its deposited metal chemical analysis (weight %) is: C, 0.25%; S, 0.030%; Si, 0.55%; Mn, 1.40%; P, 0.030%; Cr, 0.60%; Ni, 1.0%; Mo, 0.30%; V, 0.05%; Cu, 0.50%.After the test plate (panel) welding, carried out infiltration and ultrasonic examination, do not found that all the crack exists, and illustrates that the crack resistance of joint is better.The observation of the macro surface of sample weld seam: welding bead is smooth, complete penetration, fusion are good, open defects such as no slag inclusion, pore, macroscopic cracking.
The chemical composition (Wt%) of table 1 present embodiment test plate (panel) (being mother metal) ASTM A487 GRAD9
| Element | ??C | ??P | ??S | ??Mn | ??Si | ??Ni | ??Cr | ??Mo | ??Al | ??V | ??Cu |
| Scope | ??0.22- ??0.30 | ??≤0.025 | ??≤0.025 | ??0.60- ??1.00 | ??0.30- ??0.60 | ??≤0.50 | ??0.70- ??1.20 | ??0.15- ??0.35 | ??≤0.05 | ??≤0.10 | ??≤0.50 |
The mechanical performance of table 2 present embodiment test plate (panel) (being mother metal) ASTM A487 GRAD9
| Numbering | ??σ 0.2(MPa) | σ b(MPa) | ??δ(％) | ??ψ(％) | ??HB | ??Akv |
| Standard (Min) | ??517 | 655 | ??18 | ??35 | ??197-235 | ??42(-32℃) |
The mechanical performance of this experimental example of table 3 test plate (panel)
Claims (1)
1, a kind of low-nickel type steel casting repair-welding electrowelding rod is characterized in that: the percentage by weight of forming the deposited metal chemical analysis of this welding rod is: C, 0.15-0.25%; S, 0.030%; Si ,≤0.55%; Mn, 1.20-1.40%; P, 0.030%; Cr, 0.30-0.60%; Ni ,≤1.0%; Mo, 0.15-0.30%; V ,≤0.05%; Cu ,≤0.50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910101584A CN101628365A (en) | 2009-08-12 | 2009-08-12 | Low-nickel type steel casting repair-welding electrowelding rod |
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| CN200910101584A CN101628365A (en) | 2009-08-12 | 2009-08-12 | Low-nickel type steel casting repair-welding electrowelding rod |
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| CN101628365A true CN101628365A (en) | 2010-01-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101862926A (en) * | 2010-06-21 | 2010-10-20 | 西安理工大学 | Welding material for quickly welding and repairing defects of large-scale steel-casting and repairing method |
| JP2017024053A (en) * | 2015-07-24 | 2017-02-02 | 大同特殊鋼株式会社 | Die repair weld material |
-
2009
- 2009-08-12 CN CN200910101584A patent/CN101628365A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101862926A (en) * | 2010-06-21 | 2010-10-20 | 西安理工大学 | Welding material for quickly welding and repairing defects of large-scale steel-casting and repairing method |
| CN101862926B (en) * | 2010-06-21 | 2013-01-02 | 西安理工大学 | Welding material for quickly welding and repairing defects of large-scale steel-casting and repairing method |
| JP2017024053A (en) * | 2015-07-24 | 2017-02-02 | 大同特殊鋼株式会社 | Die repair weld material |
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Open date: 20100120 |