CN1743126A

CN1743126A - High-strength weather-resistant welding rod

Info

Publication number: CN1743126A
Application number: CN 200410054127
Authority: CN
Inventors: 屈朝霞; 李自刚; 侯永泰; 杨咏梅
Original assignee: Baoshan Iron and Steel Co Ltd; Tianjin Golden Bridge Welding Materials Group Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd; Tianjin Golden Bridge Welding Materials Group Co Ltd
Priority date: 2004-08-30
Filing date: 2004-08-30
Publication date: 2006-03-08
Anticipated expiration: 2024-08-30
Also published as: CN100398250C

Abstract

A sort of strong clime-withstanding welding rod is disclosed, whose coating content as follows, marble 35-40%, fluorite 15-20%, ferrotitanium 8-11%, mid-carbon Fe-Mn 3-8%, ferrosilicon 45%, synthesized isinglass(40 mesh) 2-3%, tiny ganister sand 2-4%, iron powder 12-20%, chrome 1-2%, copper powder 0.5-1%, nickel powder 1-2%, titanium pigment 4-8%. The fused metal and welded joint obtained by the invention has the good performance of withstanding clime and comprehensive performance, especially at -40deg.C it has good low temperature impact toughness, yield strength>=450MPa, tensile strength>=550MPa, elongation rate >=22%, Akv>=100j.

Description

A kind of high-strength weathering welding rod

Technical field

The present invention relates to field of welding material; Be particularly related to the supporting welding rod of the weathering steel that is used for yield strength 450MPa.

Background technology

Also do not find yield strength 〉=450MPa in the market, tensile strength 〉=550MPa, the weather-proof welding rod of high-strength and high ductility of CVN impact flexibility Akv 〉=100J in the time of-40 ℃.

Common weathering steel welding rod has: Cu-P, Cr-Cu, Ni-Cu, W-Cu, Cr-Ni-Cu alloy system.Cu-P be welding rod because of containing the P height, toughness and weldability are relatively poor, use less.Cr, Ni element are comparatively expensive on the one hand, need rationally and economic content; On the other hand, Cr-Cu, Ni-Cu, W-Cu alloy system can not well match with high-strength weathering steel Q450NQR1.Regular tenacity level other weathering steel welding rod such as high-efficiency weather proof irons steel welding rod, but it is the W-Cu alloy system, and its change chemical composition can not better be mated with the Q450NQR1 steel, thereby finally can influence the performance of welding point.

Summary of the invention

The object of the present invention is to provide a kind of high-tensile weather-proof welding rod, can solve the supporting stick electrode problem of railway with the weathering steel Q450NQR1 of yield strength 450MPa.

Technical scheme of the present invention is: high-strength weathering welding rod, its coating component are (mass percent): marble 35-40%; Fluorite 15-20%; Ferro-titanium 8-11%; Mid-carbon fe-mn 3-8%; Ferrosilicon 45%1-3%; Synthetic mica 40 order 2-3%; SILICA FUME 2-4%; Iron powder 12-20%; Crome metal 1-2%; Copper powder 0.5-1%; Nickel powder 1-2%; Titanium dioxide 4-8%.

The factor of decision welding rod performance mainly is the prescription design of welding rod.The present invention is by accurately adjusting CaCO ₃-CaF ₂-SiO ₂Slag system adds an amount of ferroalloy, appropriate design welding rod prescription in slag system.The welding rod of development has good atmospheric corrosion resistance and good all-position welding processing performance, and mechanical property satisfies instructions for use fully, has good cracking resistance and good plasticity and toughness, A _KV(40 ℃) are greater than 100J.

Because designed welding rod will have atmospheric corrosion resistance, and is complementary with weathering steel Q450NQR1.Therefore requiring the welding rod deposited metal is the Cr-Ni-Cu system, but the content of these three elements is wanted strict control, and at first comparatively expensive because of Cr, Ni element, Cr, Cu element can worsen the mechanical property of deposited metal simultaneously, make its low-temperature impact toughness obviously descend A _KV(40 ℃) can not reach the steel instructions for use.

Deposited metal of the present invention adopts the Cr-Ni-Cu alloy system, wherein, and crome metal 1-2%; Copper powder 0.5-1%; Nickel powder 1-2% guarantees the mechanical property and the weatherability of welding rod deposited metal, reaches the optimum Match of chemical composition and mother metal simultaneously.

Ferro-titanium, titanium dioxide can guarantee to contain certain Ti in the deposited metal, thereby guarantee that deposited metal has good comprehensive mechanical property and high low-temperature impact toughness.

Medium carbon manganese steel, ferrosilicon, SILICA FUME, marble, fluorite and synthetic mica, titanium dioxide are to guarantee processing property of electrode, extrusion performance and low hydrogen type etc.

Iron powder is to guarantee that weather-proof welding rod has suitable deposition efficiency.

Beneficial effect of the present invention

Welding rod of the present invention compared with prior art has following advantage:

1. manual welding rod gained deposited metal of the present invention and welding point have good atmospheric corrosion resistance, have good comprehensive performances simultaneously, and especially-40 ℃ low-temperature impact toughness is fine.

2. the combination property of manual welding rod gained deposited metal of the present invention is: yield strength 〉=450MPa; Tensile strength 〉=550MPa; Percentage elongation 〉=22%; Akv 〉=the 100J of (40 ℃ condition under).

3. an amount of, rational Cr-Ni-Cu alloy system proportioning has economy.

The specific embodiment

Coating recipe embodiment sees Table 1, and core wire is H08A; Table 2 is depicted as the chemical composition of welding rod deposited metal.

Table 1 is implemented the welding rod coating recipe example

Embodiment	Marble	Fluorite	Ferro-titanium	Mid-carbon fe-mn	45% ferrosilicon	Synthetic mica 40 orders	SILICA FUME	Iron powder	Crome metal	Copper powder	Nickel powder	Titanium dioxide
Embodiment	Marble	Fluorite	Ferro-titanium	Mid-carbon fe-mn	45% ferrosilicon	Synthetic mica 40 orders	SILICA FUME	Iron powder	Crome metal	Copper powder	Nickel powder	Titanium dioxide	1	36％	16％	10％	5％	3％	3％	3％	16％	1.3％	0.7％	1.0％	5％
2	40％	17％	8％	6％	2％	3％	2％	12％	1.8％	0.8％	1.4％	6％	1	36％	16％	10％	5％	3％	3％	3％	16％	1.3％	0.7％	1.0％	5％
2	40％	17％	8％	6％	2％	3％	2％	12％	1.8％	0.8％	1.4％	6％	3	38％	15％	9％	8％	2％	2％	3％	14％	1.9％	0.9％	1.2％	5％
4	35％	19％	10％	6％	2％	2％	2％	13％	1.0％	0.7％	1.3％	8％	3	38％	15％	9％	8％	2％	2％	3％	14％	1.9％	0.9％	1.2％	5％
4	35％	19％	10％	6％	2％	2％	2％	13％	1.0％	0.7％	1.3％	8％	5	35％	18％	8％	4％	1％	2％	3％	18％	1.5％	0.5％	2.0％	7％

Table 2 is implemented the chemical composition (mass percent) of welding rod deposited metal

Embodiment	C	Mn	Si	S	P	Ni	Cu	Cr
Embodiment	C	Mn	Si	S	P	Ni	Cu	Cr	1	0.066	1.22	0.26	0.005	0.010	0.49	0.25	0.48
2	0.077	1.20	0.21	0.007	0.012	0.55	0.25	0.50	1	0.066	1.22	0.26	0.005	0.010	0.49	0.25	0.48
2	0.077	1.20	0.21	0.007	0.012	0.55	0.25	0.50	3	0.069	1.10	0.17	0.011	0.013	0.53	0.28	0.48
4	0.068	1.09	0.16	0.006	0.012	0.51	0.25	0.47	3	0.069	1.10	0.17	0.011	0.013	0.53	0.28	0.48
4	0.068	1.09	0.16	0.006	0.012	0.51	0.25	0.47	5	0.050	0.80	0.10	0.006	0.011	0.53	0.23	0.48

Table 3 is depicted as the mechanical property of embodiment of the invention welding rod and contrast welding rod deposited metal thereof, and therefrom as can be seen, the performance of welding rod deposited metal of the present invention all can reach high strength, high-elongation and high low-temperature impact toughness.

Table 3 is implemented the mechanical property of welding rod deposited metal

Embodiment	Tensile strength sigma b (MPa)	Yield strength σ s (MPa)	Percentage elongation δ 5 (%)	V-type impact absorbing energy A _KV(J)(-40℃)
Embodiment	Tensile strength sigma b (MPa)	Yield strength σ s (MPa)	Percentage elongation δ 5 (%)	V-type impact absorbing energy A _KV(J)(-40℃)	1	570	470	26	117
2	575	485	27	151	1	570	470	26	117
2	575	485	27	151	3	585	485	26	109
4	570	475	28	161	3	585	485	26	109
4	570	475	28	161	5	560	455	28	146
Comparative Examples J506NiCu	≥490	≥390	≥22	≥27(-30℃)	5	560	455	28	146

What atmospheric exposure test was adopted is indoor accelerate corrosion test (cycle is soaked into corrosion test), all compares with the mother metal Q450NQR1 with high-weatherability, and result of the test sees Table 4.

Table 4 is implemented the corrosive nature of welding rod deposited metal

Embodiment	Corrosion weight loss amount g/m ²	Relative rate of corrosion
Embodiment	Corrosion weight loss amount g/m ²	Relative rate of corrosion	1	72.5	1.5％
2	72.0	0.8％	1	72.5	1.5％
2	72.0	0.8％	3	71.8	0.6％
4	71.9	0.7％	3	71.8	0.6％
4	71.9	0.7％	5	72.2	1.1％
Comparative Examples Q450NQR1	71.4	/	5	72.2	1.1％

Annotate: relative rate of corrosion=| mother metal weight loss-deposited metal weight loss |/mother metal weight loss; Numerical value is more little, illustrates that weatherability is suitable.

Table 4 is depicted as the corrosive nature of embodiment welding rod deposited metal, and the relative rate of corrosion of embodiment welding rod is far smaller than 10%, and therefore, the atmospheric corrosion resistance ability and the mother metal of table 4 explanation welding rod deposited metal are suitable.

Welding rod of the present invention is suitable for welding other weathering steel of tensile strength 550MPa level, and main application fields has: rail truck, building structure, bridge, engineering machinery, container etc.

Claims

1. high-strength weathering welding rod, the chemical composition of its coating is (mass percent):

Marble 35-40%;

Fluorite 15-20%;

Ferro-titanium 8-11%;

Mid-carbon fe-mn 3-8%;

Ferrosilicon 1-3%;

Synthetic mica 2-3%;

SILICA FUME 2-4%;

Iron powder 12-20%;

Crome metal 1-2%;

Copper powder 0.5-1%;

Nickel powder 1-2%;

Titanium dioxide 4-8%.

2. high-strength weathering welding rod as claimed in claim 1 is characterized in that, described ferrosilicon is 45% ferrosilicon.

3. high-strength weathering welding rod as claimed in claim 1 is characterized in that, described synthetic mica is 40 order synthetic micas.