CN1025165C - Low carbon micro alloyed submerged-arc welding wire - Google Patents

Low carbon micro alloyed submerged-arc welding wire Download PDF

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Publication number
CN1025165C
CN1025165C CN92105621A CN92105621A CN1025165C CN 1025165 C CN1025165 C CN 1025165C CN 92105621 A CN92105621 A CN 92105621A CN 92105621 A CN92105621 A CN 92105621A CN 1025165 C CN1025165 C CN 1025165C
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China
Prior art keywords
welding wire
present
submerged
arc welding
welding
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Expired - Lifetime
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CN92105621A
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CN1068528A (en
Inventor
许祖泽
金时麟
姚锡仁
雷胜利
孟润泉
彭云
陈德辉
黄锡镐
贾理果
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BAOJI PETROLEUM STEEL PIPE PLA
Central Iron and Steel Research Institute
Baoshan Iron and Steel Co Ltd
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BAOJI PETROLEUM STEEL PIPE PLA
Central Iron and Steel Research Institute
Baoshan Iron and Steel Co Ltd
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Priority to CN92105621A priority Critical patent/CN1025165C/en
Publication of CN1068528A publication Critical patent/CN1068528A/en
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Publication of CN1025165C publication Critical patent/CN1025165C/en
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Abstract

The present invention provides low carbon microalloyed submerged arc welding wire which includes chemical components by weight percentage (%): 0.03 to 0.1 % of C, 1.20 to 1.60% of Mn, 0.02 to 0.08% of Ti, 0.001 to 0.008 % of B, 0.20 to 0.40% of Mo, 0.2 to 0.4% of Y and the balance of Fe. The present invention is mainly suitable for pipe manufacture and construction for oil and gas delivery pipelines. The present invention can adopt large linear energy and high speed weld. The welding wire is not preheated before being wielded, and the welding wire is not heated after being welded. The present invention is suitable for various technological requirements of a single layer or multiple layers and a single surface or double surfaces. Weld metal has high intensity and high low impact ductility.

Description

Low carbon micro alloyed submerged-arc welding wire
The invention belongs to welding material.Mainly be applicable to submerged-arc welding, be specially adapted to the welding of the steel pipe of oil, letter shoot line.
Resemble oil, letter shoot line and so on pipeline (steel pipe), bearing oil, the pressure and temperature of gas and the effect of medium, also suffer simultaneously pass through the various natures and the artificial factor in area, in use, various disrumpent feelings or fracture accidents may take place, cause serious economy loss, simultaneously, also pollute the environment.For this reason, except that from the design, constructing and operating three aspects prevents the above-mentioned accident that reasonably selection (comprising mother metal and welding material) is most important.
In recent years, the requirement to oil, letter shoot material develops to heavy caliber, high pressure direction.For this reason, tubing has been proposed the requirement of high-intensity high-tenacity, and considered that welding procedure has been the main technology of tubulation and construction, so require tubing must have good welding performance; Simultaneously, also requirement can be adopted large-line energy, high-speed welding; Require not preheating, not after heat can square groove, promptly requires the wire rod dilution rate to reach at 60~70% o'clock, and welding seam toughness does not reduce; In addition, also require anti-H 2S burn into stress corrosion resistant and anti-hydrogen induced cracking.
In recent ten years, having developed many submerged-arc welding wires in the world, all is the submerged-arc welding wire that provides for different purposes as Japan Patent JP067205, JP143659, JP108883 and Chinese patent CN89105436.The submerged-arc welding wire that above-mentioned patent is mentioned, though all satisfied instructions for use in welding performance and strength character in varying degrees, their toughness is all lower, particularly low-temperature flexibility is lower.
U.S. Pat 3919517 provides a kind of welding wire that is used for submerged-arc welding.This welding wire adopts and falls C, pure molten iron (reduction S, P, H 2, O 2And N 2) and add the crystal grain that trace elements such as Mo, B, Ti come the refinement weld metal, so that improve low-temperature flexibility; Simultaneously, this welding wire is in varying degrees, and its welding performance and intensity have satisfied the instructions for use in some field.But this welding wire considers comprehensively that oil at present, gas industrial expansion are to wire rod and welding material proposed such as anti-hydrogen induced cracking (HIC) and anti-H 2The requirement of S corrosive nature; Simultaneously, the solder flux that is complementary with it that this welding wire adopted is still fysed flux, causes low-temperature flexibility also to be affected.So as welding oily, that the letter shoot line is used steel pipe, still there is above-mentioned weak point in this welding wire.
Purpose of the present invention is to provide a kind of low-temperature flexibility good, anti-hydrogen induced cracking (HIC) and anti-H 2The low carbon micro alloyed submerged-arc welding wire of S corrosive nature excellence.
At above-mentioned purpose, and consider that the present invention is mainly used in the welding of oil, letter shoot line usefulness APIX60, X65 and X70 tubing, the present invention has adopted the technical scheme of low-carbon (LC) combined microalloying on the design of chemical composition of welding wire.On the basis of C-Mn-Mo-B-Ti alloy system, reduce Ti content, add Rare Earth Y, be the C-Mn-Mo-B-Ti-Y alloy system; Further refinement weld metal crystal grain purifies weld metal, improves its plasticity and toughness; Simultaneously, the content of restriction Mn, P, S element, the stress corrosion resistant ability of raising weld metal; Control Ti content, the toughness of raising weld metal.For this reason, the concrete chemical composition (Wt%) of low carbon micro alloyed submerged-arc welding wire of the present invention is: C0.03~0.10%, Mn1.20~1.60%, Ti0.02~0.08%, B0.001~0.008%, Mo0.20~0.40%, Y0.2~0.4%, Si0.09~0.29%, S≤0.01%, P0.20%, surplus is Fe, addition when wherein Y is for smelting.
According to microalloying Strengthening and Toughening theory, for intensity and the toughness that improves weld metal simultaneously, can realize by the subgrain after control and refine austenite original grain and the decomposition thereof, utilize a spot of micro alloying element, impel the grain refinement of welding wire, reduce C content and pernicious gas simultaneously as far as possible, improve the toughness of weld seam.Now that design of chemical composition of the present invention is as follows according to division:
Controlling lower carbon content is in order to improve the toughness of weld seam.Reduce C content, also can reduce the segregation of P, improve the ability of the anti-hydrogen induced cracking of weld seam.
The effect that adds MoMn is to improve by solution strengthening the intensity of weld seam, and MoMn improves the anti-H of weld seam in addition 2The ability of S corrosion.
In the present invention, the purpose that adds Ti is to improve the toughness of weld seam.For this reason, Ti content be controlled at 0.02~0.08% more suitable.The affinity of Ti and N is strong, and under the metal melting state, Ti and N form TiN.This TiN is very tiny, and melting temperature is higher, places restrictions on the austenite crystal of preceding road weld seam during multilayer welding and grows up, i.e. the adding of Ti increases nucleus, grain refinement, thereby improve its toughness.But when containing Ti amount (as Ti 〉=0.2%) more for a long time, not only form TiN, also form TiC, TiS, when solidifying, these TiN, TiC, TiS will separate out from matrix, form second phase, be distributed on the matrix to disperse, reduce toughness widely.
The temperature that B, Mo element deferrable austenite → ferritic phase change is impelled the formation of intragranular acicular ferrite; B can assemble at crystal boundary, suppresses the formation of pro-eutectoid ferrite and ferrite side plate.It is above-mentioned that both all help improving the toughness of weld seam.
The main effect one that adds Y during smelting is to make inclusion ballings such as S, P, and fuses in the slag with field trash thereupon, thereby purifies the welding wire metal, improves the low-temperature flexibility of weld seam; The 2nd, add Y except that a part enters the slag China and foreign countries, also have part Y to enter in the welding wire metal, can reduce weld metal hydrogen induced cracking sensitiveness.For this reason, among the present invention, add Y-0.2~0.4%, addition during for smelting.
In order to improve the anti-H of weld seam 2The ability of S corrosion is considered from smelting process, adopts ladle Si-Ca powder to handle, and its purpose one is to reduce S content, thereby reduces MnS content; The 2nd, nodularization and refinement MnS are mingled with, and make it shape and diminish round.Both all can improve anti-H 2The S corrosive nature.
When adopting welding wire of the present invention to weld, the solder flux that is complementary with it is sintered flux (as the SJ101 sintered flux); Can adopt large-line energy, high-speed welding, but and square groove, not preheating before the weldering, postwelding does not need heat treatment, welding technological properties is good.
Compared with prior art, the present invention has following advantage:
1. the present invention has the excellent comprehensive performance; Advantages of higher tensile strength and good low-temperature flexibility are not only arranged, and also have anti-preferably H 2S corrosion and anti-hydrogen induced cracking performance.
2. can adopt large-line energy, high-speed welding, but and square groove, not preheating before the weldering, not after heat of postwelding.
3. applicable to single or multiple lift, the requirement of single or double kinds of processes, and various coiled sheet thickness.
4. cost is low.
Embodiment
According to the chemical composition of welding wire for submerged-arc welding of the present invention, smelted 10 batches of welding wires of the present invention, its concrete chemical composition is as shown in table 1.
(table 1 is seen the literary composition back)
Adopt these five batches of welding wires and SJ101 fluorine alkalescent sintered flux to be complementary, X70 mild steel steel plate coiled sheet is carried out the spiral welded pipe welding.The postwelding sampling, the toughness of mensuration weld metal, the gained result is as shown in table 2.
(table 2 is seen the literary composition back)
The chemical composition (weight %) of table 1 embodiment welding wire
Numbering C Si Mn S P Mo B Ti Y*
1 0.046 <0.4 1.22 0.007 0.003 0.28 0.0028 0.02 0.3
2 0.087 <0.4 1.41 0.009 0.003 0.28 0.0031 0.02 0.3
3 0.053 0.29 1.41 0.009 0.003 0.29 0.0059 0.08 0.2
4 0.070 0.30 1.41 0.007 0.003 0.29 0.0055 0.06 0.3
5 0.050 0.21 1.51 0.007 0.004 0.30 0.0050 0.07 0.4
6 0.03 0.21 1.51 0.007 0.004 0.30 0.0046 0.06 0.3
7 0.08 0.02 1.30 0.002 0.016 0.31 0.0041 0.05 0.3
8 0.07 0.03 1.29 0.003 0.018 0.30 0.0043 0.036 0.3
9 0.03 0.10 1.37 0.005 0.012 0.31 0.0042 0.034 0.3
10 0.06 0.09 1.40 0.005 0.020 0.33 0.0046 0.028 0.3
* annotate: the addition when Y is smelting
Table 2 embodiment gained weld metal impact flexibility
Numbering mother metal grade of steel (CVN) (CVN)
-20 ℃ of impact flexibility (J)-40 ℃ impact flexibility (J)
1 ×70 66×2=132 63×2=126
2 ×70 69×2=138 72×2=144
3 ×70 73×2=146 72×2=144
4 ×70 78×2=156 74×2=148
5 ×70 68×2=136 75×2=150
6 ×70 78×2=156 74×2=148
7 ×70 67×2=134 74×2=148
8 ×70 73×2=146 73×2=146
9 ×70 64×2=128 66×2=132
10 ×70 69×2=138 65×2=130
Annotate: test is 5 * 10 * 55 with impact specimen, is 1/2 standard sample, Gu the gained result takes advantage of 2(according to the API standard).

Claims (1)

  1. A kind of low carbon micro alloyed submerged-arc welding wire that is used for soldering oil, letter shoot line usefulness APIX60, X65 and X70 tubing, contain C, Mn, Mo, Ti and B in the chemical composition, it is characterized in that chemical composition scope (wt%) is: C0.03~0.1%, Mn1.20~1.60%, Ti0.02~0.08%, B0.001~0.008%, Mo0.20~0.40%, Y0.2~0.4%, Si0.09~0.29%, S≤0.01%, P≤0.20%, surplus is Fe.
CN92105621A 1992-07-14 1992-07-14 Low carbon micro alloyed submerged-arc welding wire Expired - Lifetime CN1025165C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN92105621A CN1025165C (en) 1992-07-14 1992-07-14 Low carbon micro alloyed submerged-arc welding wire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN92105621A CN1025165C (en) 1992-07-14 1992-07-14 Low carbon micro alloyed submerged-arc welding wire

Publications (2)

Publication Number Publication Date
CN1068528A CN1068528A (en) 1993-02-03
CN1025165C true CN1025165C (en) 1994-06-29

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1058923C (en) * 1997-05-26 2000-11-29 武汉钢铁(集团)公司 Low-alloy high-strength and high-toughness submerged-arc welding electrode
CN1093025C (en) * 1999-05-14 2002-10-23 中国科学院金属研究所 High-toughness anticorrosion welding wire for submerged are welding of steel pipeline
CN1104993C (en) * 2000-01-19 2003-04-09 武汉钢铁(集团)公司 High-strength and high-toughness submerged-arc welding wire
CN109454360A (en) * 2018-09-17 2019-03-12 昆山中冶宝钢焊接材料有限公司 A kind of SAW consumable material for double wire welding
CN112404671B (en) * 2020-11-06 2022-09-06 李素坤 Solid welding wire for FCB (flux cored arc welding) method high heat input submerged arc welding and preparation method and application thereof

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Expiration termination date: 20120714

Granted publication date: 19940629