CN101658983B - High-toughness gas protective welding wire for large-linear energy welding low-alloy steel - Google Patents
High-toughness gas protective welding wire for large-linear energy welding low-alloy steel Download PDFInfo
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- CN101658983B CN101658983B CN2009100639989A CN200910063998A CN101658983B CN 101658983 B CN101658983 B CN 101658983B CN 2009100639989 A CN2009100639989 A CN 2009100639989A CN 200910063998 A CN200910063998 A CN 200910063998A CN 101658983 B CN101658983 B CN 101658983B
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Abstract
The invention relates to a high-toughness gas protective welding wire for large-linear energy welding low-alloy steel. The technical scheme is that the welding wire comprises the following chemical components in percentage by weight: 0.02-0.12 percent by weight of C, 1.00-2.50 percent by weight of Mn, 0.05-0.50 percent by weight of Si, 0.03-0.30 percent by weight of Ti, 0.001-0.004 percent by weight of B, less than or equal to 0.50 percent by weight of Cr, less than or equal to 0.5 percent by weight of Mo, less than or equal to 0.025 percent by weight of S, less than or equal to 0.025 percentby weight of P, 0.03-0.3 percent by weight of two or three kinds of Ca, Mg and Ba and the balance of Fe and inevitable impurities. The high-toughness gas protective welding wire is manufactured by the following steps: carry out steel making on molten iron or scrap steel or the molten iron and the scrap steel by adopting a converter or an electric arc furnace, and then refining and adjusting molten iron components, casting into square billets, and then rolling into coil rods and cold-drawing into welding wires by conventional processes. The prepared welding material has good metal welding toughness and high tensile strength and is suitable for the welding of low-alloy high-strength steel under the condition of large-linear energy welding condition of 100-800kj/cm.
Description
Technical field
The invention belongs to the gas protecting welding wire technical field.Be specifically related to a kind of high-toughness gas protective welding wire for large-linear energy welding low-alloy steel.
Background technology
In the last thirty years, in order to improve the welding efficiency of heavy construction structure, guarantee the security reliability of its use, large-line energy solder technology such as the single face submerged-arc welding that welding efficiency is high, electrogas arc welding, electroslag welding are used in succession, this has come problem newly for traditional low alloy high strength steel strip, be weld seam and the intensity and the toughness variation of welding coarse-grain heat affected area (HAZ), and easily produce defective such as welding cold cracking.Therefore, the improvement of weld seam and HAZ toughness becomes the focus and emphasis of Hi-Stren steel large-line energy welding research and development.
(tensile strength is 600～9000MPa) structural transformation behavior and controls forming process and the control method thereof that must fully take all factors into consideration mother metal and welding heat affected zone tissue thereof Hi-Stren steel under the large-line energy welding condition.Because the alligatoring of big sweating heat initial conditions weld seam down and welding heat affected zone tissue, soften and the reduction of the embrittlement of the weld seam that causes therefrom and welding heat affected zone and strength of joint is a subject matter during Hi-Stren steel welds.
For this reason, both at home and abroad the weld seam to Hi-Stren steel has carried out a large amount of research and discoveries with aspects such as welding heat affected zone structure property feature, austenite crystal growth dynamics, research and design welding material and welding method under the large-line energy welding condition that makes new advances.As " high ductility buried arc welding wire for low-alloy super-strength steel " (CN1919524) patented technology contain Ni, Mo and Cu; " high-toughness gas protective welding wire for low alloy high-strength steel " (CN1358607) patented technology contains Cr, Cu and higher Si, Ni; " solder wire material of submerged-arc welding for high grade pipeline steel " (CN1623719) patented technology contains Rare-Earth Ce and higher Ni, Mo and Cu; " solid-core welding wire for gas shielded welding " (CN1843683) patented technology contains higher Si, Mo and Cu; " solid core welding wire that is used for gas shielded arc welding " (CN1880007) patented technology contains La and Se and higher Si.There are the following problems:
1, Si content is higher in the welding material, because of the Si of high level can promote the formation of M/A, reduces the toughness of weld seam and welding heat affected zone (HAZ);
2, contain a kind of in the valuable alloying elements such as higher expensive metal Ni, Cr, Mo, Cu or more than one in the welding material, the cost of product is improved;
3, contain rare earth element in the welding material, rare earth element is very active element, is not easy control, and pollutes weld metal easily, is unfavorable for the raising of quality of weld joint.
4, the sweating heat of welding material adaptation is imported or is made weld heat input lower.
Summary of the invention
The present invention is intended to overcome above-mentioned technological deficiency, and purpose provides that a kind of chemical composition is simple, with low cost, the low-alloy steel high-ductility gas shielded welding wire of the large-line energy welding process requirement that is adapted to 100-800kJ/cm; The weld metal tensile strength height and the good toughness that weld with this welding material.
For achieving the above object, the technical solution used in the present invention is: the chemical composition and the content thereof of this welding wire are: C is 0.02～0.12wt%, and Mn is 1.00～2.50wt%, and Si is 0.05～0.50wt%, Ti is 0.03～0.30wt%, B is 0.001～0.004wt%, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, two or three among Ca, Mg, the Ba is 0.03～0.3wt%, surplus is Fe and unavoidable impurities.
Press mentioned component, adopt converter or electric arc furnaces that molten iron or steel scrap or molten iron are carried out refining and adjustment molten steel composition with steel scrap after steel-making, the journey of casting again becomes square billet, and process heat rolls into wire rod routinely then, and cold-drawn becomes welding wire.
Owing to adopt technique scheme; the present invention one is under gas shield welding condition; making has more oxygen and microalloy element Ti, Ca, Mg, Ba effect to form Ti, Ca, the oxide of Mg, Ba or their composite oxides particle in the weld seam; help the formation of acicular ferrite in the weld seam; can be used as simultaneously austenitic pinning particle again and stop growing up of austenite crystal; can form more tiny particle; simultaneously again can with impurity effect such as sulphur, help purifying weld metal.Improved the strength and toughness of weld metal, especially toughness.
The 2nd, suitably improve Mn and a spot of Cr content to improve the quenching degree of weld seam, reach the B that adds trace and not only can improve quenching degree but also help forming acicular ferrite.Owing to do not contain rare earth element, help stabilizing and increasing the quality of welding point in addition.
The present invention has chemical composition characteristics simple, with low cost.When this welding wire adopted the gas shield welding, the tensile strength of weld metal was 650～920MPa ,-40 ℃ of ballistic work A
KV〉=50J is suitable for the gas shielded arc welding of 600～900MPa level low alloy high-strength steel.This solid core welding wire can realize that molten drop stablizes transition and obtain having the low fire check sensitiveness and the welding point of excellent toughness.Utilize welding material of the present invention to weld, welding seam toughness is good, tensile strength is high, is suitable as the gas protecting welding wire of Hi-Stren steel under the large-line energy welding condition of 100-800kJ/cm.
The present invention is applicable to the welding of low-alloy steel such as large scale structure, equipment, facility such as crude oil storage tank, building, boats and ships warship.The large-line energy welding shipbuilding steel plate that is particularly useful for low-alloy high-strengths such as the large-scale counter deck of boat and LPG hull.
The specific embodiment
Below in conjunction with the specific embodiment the present invention being further described, is not limiting the scope of the invention:
Embodiment 1
A kind of high-toughness gas protective welding wire for large-linear energy welding low-alloy steel.The chemical composition and the content thereof of this gas protecting welding wire are: C is 0.02～0.06wt%; Mn is 2.00～2.50wt%; Si is 0.05～0.50wt%, and Ti is 0.03～0.30wt%, and B is 0.001～0.004wt%; Cr≤0.5wt%; Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%; Ca and Mg are 0.03～0.1wt%, and surplus is Fe and unavoidable impurities.
Press mentioned component, adopt converter that molten iron is carried out refining and adjusts molten steel composition after steel-making, be cast into square billet again, process heat rolls into wire rod routinely then, and cold-drawn becomes welding wire.
The welding wire of present embodiment manufacturing is used for the large-linear energy welding low-alloy steel that tensile strength is 700～800MPa.Welding manner is electro-gas (enclosed) welding, and protective gas is 80%Ar+20%CO
2, weld heat input is 600～800kJ/cm, does not heat-treat after the welding.The tensile strength of weld metal is 830～920MPa ,-40 ℃ of ballistic work A
KV〉=50J.
Embodiment 2
A kind of high-toughness gas protective welding wire for large-linear energy welding low-alloy steel.The chemical composition and the content thereof of this gas protecting welding wire are: C is 0.08～0.12wt%; Mn is 1.50～2.00wt%; Si is 0.05～0.50wt%, and Ti is 0.03～0.30wt%, and B is 0.001～0.004wt%; Cr≤0.5wt%; Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%; Mg and Ba are 0.05～0.15wt%, and surplus is Fe and unavoidable impurities.
Press mentioned component, adopt electric arc furnaces that molten iron is carried out refining and adjusts molten steel composition after steel-making, be cast into square billet again, process heat rolls into wire rod routinely then, and cold-drawn becomes welding wire.
The welding wire of present embodiment manufacturing is used for the large-linear energy welding low-alloy steel that tensile strength is 700～800MPa.Welding manner is submerged-arc welding, and protective gas is 80%Ar+20%CO
2, weld heat input is 400～600kJ/cm, does not heat-treat after the welding.The tensile strength of weld metal is 730～820MPa ,-40 ℃ of ballistic work A
KV〉=70J.
Embodiment 3
A kind of high-toughness gas protective welding wire for large-linear energy welding low-alloy steel.The chemical composition and the content thereof of this gas protecting welding wire are: C is 0.04～0.08wt%; Mn is 1.00～1.50wt%; Si is 0.05～0.50wt%, and Ti is 0.03～0.30wt%, and B is 0.001～0.004wt%; Cr≤0.5wt%; Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%; Ca and Ba are 0.1～0.2wt%, and surplus is Fe and unavoidable impurities.
Press mentioned component, adopt converter that steel scrap is carried out refining and adjusts molten steel composition after steel-making, be cast into square billet again, process heat rolls into wire rod routinely then, and cold-drawn becomes welding wire.
The welding wire of present embodiment manufacturing is used for the large-linear energy welding low-alloy steel that tensile strength is 600～700MPa.Welding manner is for being electro-gas (enclosed) welding, and protective gas is 80%Ar+20%CO
2, weld heat input is 100～300kJ/cm, does not heat-treat after the welding.The tensile strength of weld metal is 650～720MPa ,-40 ℃ of ballistic work A
KV〉=80J.
Embodiment 4
A kind of high-toughness gas protective welding wire for large-linear energy welding low-alloy steel.The chemical composition and the content thereof of this gas protecting welding wire are: C is 0.05～0.09wt%; Mn is 1.20～1.70wt%; Si is 0.05～0.50wt%, and Ti is 0.03～0.30wt%, and B is 0.001～0.004wt%; Cr≤0.5wt%; Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%; Ca, Mg and Ba are 0.15～0.3wt%, and surplus is Fe and unavoidable impurities.
Press mentioned component, adopt converter molten iron and steel scrap to carry out refining and adjustment molten steel composition after steel-making, be cast into square billet again, process heat rolls into wire rod routinely then, and cold-drawn becomes welding wire.
The welding wire of present embodiment manufacturing is used for the large-linear energy welding low-alloy steel that tensile strength is 650～750MPa.Welding manner is electro-gas (enclosed) welding, and protective gas is 80%Ar+20%CO
2, weld heat input is 120～320kJ/cm, does not heat-treat after the welding.The tensile strength of weld metal is 670～740MPa ,-40 ℃ of ballistic work A
KV〉=75J.
This specific embodiment has chemical composition characteristics simple, with low cost.The welding wire of manufacturing is used for the large-linear energy welding low-alloy steel that tensile strength is 600～900MPa.Welding manner is electro-gas (enclosed) welding or submerged-arc welding, and the tensile strength of weld metal is 650～920MPa ,-40 ℃ of ballistic work A
KV〉=50J.This solid core welding wire can realize that molten drop stablizes transition and obtain having the low fire check sensitiveness and the welding point of excellent toughness.Utilize the prepared welding material of this specific embodiment to weld, welding seam toughness is good, tensile strength is high, is applicable to the large-line energy welding of Hi-Stren steel at 100-800kJ/cm.
This specific embodiment is applicable to the low-carbon and low-alloy steel plate, is widely used in the welding of steel such as large scale structure, equipment, facility such as crude oil storage tank, building, boats and ships warship.Especially be suitable for the large-line energy welding shipbuilding steel plate of low-alloy high-strengths such as the large-scale counter deck of boat and LPG hull.
Claims (1)
1. high-toughness gas protective welding wire for large-linear energy welding low-alloy steel, the chemical composition and the content thereof that it is characterized in that this welding wire are: C is 0.02～0.12wt%, and Mn is 1.00～2.50wt%, and Si is 0.05～0.50wt%, Ti is 0.03～0.30wt%, B is 0.001～0.004wt%, Cr≤0.5wt%, Mo≤0.5wt%, S≤0.025wt%, P≤0.025wt%, two or three among Ca, Mg, the Ba is 0.03～0.3wt%, surplus is Fe and unavoidable impurities;
Press mentioned component, adopt converter or electric arc furnaces that molten iron or steel scrap or molten iron are carried out refining and adjustment molten steel composition with steel scrap after steel-making, be cast into square billet again, process heat rolls into wire rod routinely then, and cold-drawn becomes welding wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100639989A CN101658983B (en) | 2009-09-15 | 2009-09-15 | High-toughness gas protective welding wire for large-linear energy welding low-alloy steel |
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| CN2009100639989A CN101658983B (en) | 2009-09-15 | 2009-09-15 | High-toughness gas protective welding wire for large-linear energy welding low-alloy steel |
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| CN101658983A CN101658983A (en) | 2010-03-03 |
| CN101658983B true CN101658983B (en) | 2011-09-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102500953A (en) * | 2011-12-14 | 2012-06-20 | 上海交通大学 | High-strength low-yield-ratio gas shielded welding wire |
| CN102766748B (en) * | 2012-08-10 | 2013-07-24 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-temperature steel plate capable of being welded at high heat input |
| CN103692108B (en) * | 2013-12-19 | 2015-10-07 | 唐山鸿鹏焊业有限公司 | A kind of production technology of boron-containing alloy steel welding wire |
| 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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