CN103331530B

CN103331530B - A kind of RmHigh-ductility pure argon shield welding wire and the using method thereof of >=1100MPa

Info

Publication number: CN103331530B
Application number: CN201310235284.8A
Authority: CN
Inventors: 陈浮; 黄治军; 缪凯; 李立军; 钟如涛; 刘文艳
Original assignee: Wuhan Iron and Steel Group Corp
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2013-06-14
Filing date: 2013-06-14
Publication date: 2016-05-18
Anticipated expiration: 2033-06-14
Also published as: CN103331530A

Abstract

A high-ductility pure argon shield welding wire of tensile strength >=1100MPa, its component and weight percent content are: C:0.07～0.19, Si:0.60～0.90, Mn:1.40～1.80, Ni:1.50～2.30, Cr:0.15～0.65, Mo:0.35～0.85, Cu:0.10～0.30, RE:0.05～0.30, Zr:0.010～0.018, P≤0.010, S≤0.008, Als≤0.01, N≤0.002, O≤0.002; Its using method: adopt the welding of dc source opposition method; Welding current 265～330? A, arc voltage 26～33? V, speed of welding 29～40? cm/min, gas flow 15～20? L/min, pure argon protection. The present invention etc. are strong, and matching is good, tensile strength >=1100MPa, and does is contraction percentage of area Z not less than 55? %; percentage elongation A is not less than 17%, and the metal argon arc welding (MIG) of pure argon protection connects the front without preheating of weldering, and postwelding is without after heat and heat treatment; can bear larger sweating heat input, welding efficiency is improved.

Description

A kind of RmHigh-ductility pure argon shield welding wire and the using method thereof of >=1100MPa

Technical field

The present invention relates to a kind of welding wire and using method method, belong to particularly gas shield welding wire and the using method thereof of function admirable, is R definitely_mHigh-ductility pure argon shield welding wire and the using method thereof of >=1100MPa.

Background technology

Use high-strength steel can bring plurality of advantages, comprise weight reduction, reduce costs and easily process and transport etc., therefore high-strength steel is widely used in the fields such as engineering machinery, electric power, pressure vessel, automobile. To high strength more, more the requirement of high-plasticity is the principal element that promotes high-strength steel development, and the scarcity of welding material is to affect high-strength steel to apply vital factor. Therefore, solve timely and effectively supporting welding material and the welding procedure problem of high-strength steel, will promote applying of high-strength steel.

Tensile strength 1000MPa and above high-strength steel machine industry at home is brought into use, and early stage, the high strength steel plates that use Sweden or Japanese import, and supported the use import welding material more, with high costs. Domestic iron and steel enterprises also can provide 1000MPa and above high strength steel plate now, but the welding wire that can be used for the large same intensity rank of producing of stable performance is not supporting with it. The high-strength steel of this intensity rank of welding adopts other welding wire of low intensity level more at present, does not have the requirement of strong couplings such as realizing. For this this project has been carried out the development of the straight argon gas protecting welding wire of high-strength high-plasticity.

About the research of high-strength gas protecting welding wire, all find relevant document and patent both at home and abroad, also find the report that tensile strength is greater than the gas protecting welding wire of 1000MPa, such as Kobe Steel, the Nippon Steel etc. of Hungary Budapest university, Japan.

Abroad find Budapest university of Hungary about annealing in process after tensile strength reach 1200～1400MPa, the development of gas shield welding wire for high carbon tool steel MIG welding, and a kind of high strength of tensile strength >=1200MPa of providing of Nippon Steel, high tenacity gas is protected arc welding wire, the tensile strength that Kobe Steel provides reaches 980～1080N/mm2, a kind of high-ductility gas shielded welding wire and the hot strength with excellent low-temperature flexibility reach 980～1080N/mm2, there is good low-temperature toughness high tension steel Ar-CO2 mixed gas arc welding silk, the tensile strength that Kawasaki Steel provides is up to more than 950MPa, there is superhigh intensity, the documents such as the gas protecting welding wire of superhigh tenacity and patent. domesticly find the 1210MPa that pertinent literature and the mentioned strength grade of patent all can reach lower than this project welding wire.

The welding wire that Budapest university of Hungary relates to need to just can reach the above intensity of 1000MPa through post weld heat treatment, Japanese related welding wire chemical composition is different from this project, it is mainly to improve Ni, Cr, Mo content, Ni weight content reaches 6%, Cr reaches 1.5%, Mo reaches 4%, this has increased soldering wire alloy cost, and high alloy content is manufactured easy fracture of wire in drawing process at welding wire, need to improve the annealing temperature in drawing process, increase drawing passes, the difficulty that this has increased welding wire manufacture process undoubtedly, has improved the process cost that welding wire is manufactured. Importantly: Ni content in weld seam exceedes 3.5%, ribbon microscopic structure and chemical inhomogeneity can obviously increase, and especially at high-strength steel weld seam, high Ni can cause the serious embrittlement of weld seam. Cr is in the time exceeding 1%, and the as-welded plasticity and toughness of high-strength steel welding point can decline, and after Overheating Treatment, can obviously decline. Mo content can obviously improve bead crack sensitiveness in the time exceeding 1.1%, especially need to eliminate stress under condition of heat treatment at high-strength steel welding point postwelding, and high Mo harm is larger. And related welding wire does not all reflect plasticity quality.

Summary of the invention

Object of the present invention is to overcome the deficiency that prior art exists; a kind of tensile strength >=1100MPa is provided; contraction percentage of area Z is not less than 55%; percentage elongation A is not less than 17%; the metal argon arc welding (MIG) of pure argon protection connects the front without preheating of weldering; postwelding, without after heat and heat treatment, waits the R that strong matching is good_mHigh-ductility pure argon shield welding wire and the using method thereof of >=1100MPa.

Realize the measure of above-mentioned purpose:

The high-ductility pure argon shield welding wire of a kind of tensile strength >=1100MPa, its component and weight percent content are: C:0.07～0.19, Si:0.60～0.90, Mn:1.40～1.80, Ni:1.50～2.30, Cr:0.15～0.65, Mo:0.35～0.85, Cu:0.10～0.30, RE:0.05～0.30, Zr:0.010～0.018, P≤0.010, S≤0.008, Als≤0.01, N≤0.002, O≤0.002, surplus is Fe and inevitable impurity element.

A using method for the high-ductility pure argon shield welding wire of tensile strength >=1100MPa, it is: adopt dc source opposition method to weld; Welding current is at 265～330A, and arc voltage is at 26～33V, and speed of welding is at 29～40cm/min, and gas flow, at 15～20L/min, adopts pure argon protection; Weld seam obtains tiny bainite and highdensity low-carbon martensite.

Composition Design theory of the present invention

Alloying Design of the present invention is on C, Mn, Si basis, is aided with the multiple microalloy elements such as rational Ni, Mo, Cr, Cu, RE, Zr. And by the adding of RE, Zr element, be unfavorable for the content of Weld Performance constituent content effectively to reduce Ni, Mo, Cr and P, S, Als, N, O etc., and then reduce the overall alloy content of welding wire, make welding wire be easy to manufacture. This is because of Ni, Mo, higher welding wire manufacture difficulty and the cost of not only increasing of Cr content, more can increase the tendency of hardenability of weld metal, improves cold crack sensitiveness, and integrity of welded joint can be worsened. Zr deoxidation desulfuration in weld metal is denitrogenated, and refinement seam organization crystal grain improves weld strength and plasticity. Zr, in the present invention's 0.010～0.018% scope, can play the effect of solution strengthening, because itself and oxygen affinity are better than Fe, forms ZrO in weld seam₂, remove oxygen in weld seam and form disperse phase, play dispersion-strengthened action, and also can play invigoration effect with C formation refractory carbides. RE can change field trash pattern character in weld metal, makes its refinement and nodularization, becomes modification and adds element, effectively improves weld strength. And welding wire welding technological properties of the present invention is good, and postwelding appearance of weld is attractive in appearance, flawless produces, and weld(ing) deposit typical case's mechanical property is tensile strength R_mBe not less than that 1100MPa, percentage elongation A are not less than 17%, contraction percentage of area Z is not less than 55%.

The present invention compared with prior art; good etc. strong matching; tensile strength >=1100MPa; contraction percentage of area Z is not less than 55%; percentage elongation A is not less than 17%, and the metal argon arc welding (MIG) of pure argon protection connects the front without preheating of weldering, and postwelding is without after heat and heat treatment; and can bear larger sweating heat input, welding efficiency is improved.

Detailed description of the invention

Below the present invention is described in detail:

Embodiment 1:

Experimental condition: adopt 50kg vacuum drying oven to carry out welding wire steel smelting, note controlling gas content in steel in smelting process. The component of welding wire steel and weight percent content are: C:0.07%, Si:0.84%, Mn:1.57%, Ni:1.87%, Cr:0.43%, Mo:0.35%, Cu:0.30%, RE:0.30%, Zr:0.018%, P:0.008%, S:0.004%, Als:0.009%, N:0.002%, O:0.002%, all the other are that Fe is inevitably mingled with other.

Rolling from Ingot is made to dish circle, be drawn into the welding wire that diameter is 1.2mm.

Welding wire is carried out to deposited metal welding performance test, and the bevel angle of welding is 45^o, be with 12 millimeters of backing plates, root gap is 12 millimeters. Adopt pure Ar gas shielded welding, before dc source opposition method, welding current 265～280A, arc voltage 26～28V, speed of welding 29～31cm/min, gas flow 15～17L/min, weldering, without preheating, postwelding are without after heat and heat treatment. The thick 20mm of test piece for welding, the mechanical property of deposited metal is: R_m=1210MPa, A=17%, Z=62%, weld metal has good strong plasticity coupling.

Adopt 6 millimeters of specification Wuhan Iron and Steel Plant high-strength engineering machinery steel Q1100 of said welding method welding, adapter plate draws the tensile strength R of test reflection joint_mFor 1190MPa, sample break weldering outside 16mm place, joint clod wash d=4a, 120^oIntact. Cold-bending property is good. Result of the test explanation, this project welding wire and the welding of 1100MPa grade super strength steel, joint has good strong plasticity coupling, the strong coupling such as can realize and weld.

Embodiment 2:

Experimental condition: adopt 0.5 ton of electric furnace to carry out welding wire steel smelting.

The component of welding wire steel and weight percent content are: C:0.19%, Si:0.60%, Mn:1.40%, Ni:1.50%, Cr:0.15%, Mo:0.85%, Cu:0.22%, RE:0.05%, Zr:0.015%, P:0.007%, S:0.005%, Als:0.008%, N:0.002%, O:0.002%, all the other are that Fe is inevitably mingled with other.

Rolling from Ingot is made to dish circle, be drawn into the welding wire that diameter is 1.2mm, and through copper coating.

Welding wire is carried out to deposited metal soldering test. Adopt pure Ar gas shielded welding, before dc source opposition method, welding current 275～290A, arc voltage 28～30V, speed of welding 30～33cm/min, gas flow 17～19L/min, weldering, without preheating, postwelding are without after heat and heat treatment.

Through inspection, the mechanical property of weld(ing) deposit is: R_m=1200MPa, A=16%, Z=58%, weld metal has good strong plasticity coupling.

Embodiment 3:

The component of welding wire steel and weight percent content are: C:0.11%, Si:0.72%, Mn:1.72%, Ni:2.30%, Cr:0.32%, Mo:0.56%, Cu:0.10%, RE:0.11%, Zr:0.012%, P:0.009%, S:0.004%, Als:0.008%, N:0.002%, O:0.002%, all the other are that Fe is inevitably mingled with other.

After smelting, welding wire steel is drawn into the welding wire that diameter is 1.2mm, and through copper coating.

Welding wire is carried out to deposited metal soldering test. Adopt pure Ar gas shielded welding, adopt dc source opposition method, welding current 300～315A, arc voltage 31～33V, speed of welding 34～36cm/min, gas flow 18～20L/min, the front without preheating of weldering, postwelding without after heat and heat treatment.

Through inspection, the mechanical property of weld(ing) deposit is: R_m=1198MPa, A=15%, Z=62%, weld metal has good strong plasticity coupling.

Embodiment 4:

The component of welding wire steel and weight percent content are: C:0.17%, Si:0.90%, Mn:1.80%, Ni:1.71%, Cr:0.65%, Mo:0.71%, Cu:0.27%, RE:0.21%, Zr:0.010%, P:0.008%, S:0.005%, Als:0.009%, N:0.002%, O:0.002%, all the other are that Fe is inevitably mingled with other.

Welding wire is carried out to deposited metal soldering test. Adopt pure Ar gas shielded welding, adopt dc source opposition method, welding current 315～330A, arc voltage 29～32V, speed of welding 37～40cm/min, gas flow 17～19L/min, the front without preheating of weldering, postwelding without after heat and heat treatment.

Through inspection, the mechanical property of weld(ing) deposit is: R_m=1210MPa, A=17%, Z=60%, weld metal has good strong plasticity coupling.

Welding wire, in above-mentioned welding process, not only shows good welding serviceability, and welding arc stablility, splashes little, and pore-free, moulding are attractive in appearance, are adapted to all-position welding.

Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.

Claims

1. the high-ductility pure argon shield welding wire of a tensile strength >=1100MPa, its component and weight percent content are: C:0.17～0.19, Si:0.60～0.90, Mn:1.40～1.80, Ni:1.50～2.30, Cr:0.32～0.65, Mo:0.56～0.85, Cu:0.10～0.30, RE:0.11～0.30, Zr:0.010～0.018, P≤0.009, S≤0.005, Als≤0.01, N≤0.002, O≤0.002, and surplus is Fe and inevitable impurity element;

Using method:

Adopt dc source opposition method to weld; Welding current is at 290～330A, and arc voltage is at 26～33V, and speed of welding is at 31～40cm/min, and gas flow, at 15～20L/min, adopts pure argon protection; Weld seam obtains tiny bainite and highdensity low-carbon martensite.