CN101701318A - Steel for flux-cored wire jacket and manufacturing method thereof - Google Patents
Steel for flux-cored wire jacket and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to steel for a flux-cored wire jacket and a manufacturing method thereof. The steel solves the problem that the existing steel has bad component matching degree with the flux core, more impurity element content, low elongation percentage and low welding wire deposited metal obdurability, and easily produces strip breakage, and the like. The measure is as follows: the steel comprises chemical constituents according to the weight percentage: 0.012-0.038% of C, 0.003-0.009% of Si, 0.20-0.29% of Mn, 0.015-0.05% of Cu, 0.015-0.19% of Al, 0.001-0.005% of Re, less than or equal to 0.01% of P, less than or equal to 0.008% of S, less than or equal of 0.002% of N, the rest of Fe and unavoidable impurities. The manufacturing method is as follows: carrying out melting procedures such as hot metal desulfurization, converter blowing, RH vacuum treatment and the like on steel ball components which are continuously cast and form a briquette; and then carrying out hot rolling and reeling; and finally pickling, cold rolling a single rack, cover annealing, finishing, oiling and packaging. The steel has low carbon, silicon and phosphorus, low yield ratio, high purity, good ductility and component matching with the flux-core.
Description
Technical field
The present invention relates to low alloy steel and make the field, specifically belong to a kind of steel for flux-cored wire jacket and manufacture method thereof.
Background technology
In existing welding material, flux-cored wire is the highest product of technology content, be also referred to as be welding material the 4th generation product.Because flux-cored wire has gas shield solid wire, welding wire for submerged-arc welding high-level efficiency, automatization concurrently and welding rod is wide in variety, it is wide to adapt to, advantage welding technological properties two aspects; become the current tool welding material of development prospect, represented the developing direction of contemporary welding material.The application of China's flux-cored wire starts from the initial stage of the Bao Steel eighties in 20th century, is the SAN-55A flux-cored wire of import Japan Nippon Steel at that time.Until 2000, the flux-cored wire of China was used to produce and is just stepped into the right path.Present China local enterprise comprises external jointly or individual proprietorship, and flux-cored wire manufacturing enterprise is 30 families nearly, nearly 200,000 tons of yearly capacities.Surplus present domestic flux-cored wire production line amounts to 60, remove 4 strip adoption dish garden methods, outside the 1 strip adoption steel pipe method, all the other all are to adopt the steel band method to produce flux-cored wire.The flux-cored wire performance depends mainly on flux-cored wire starting material, medicine core prescription and produces equipment and technology.The flux-cored wire manufacturing requires used steel band low-carbon (LC), low-sulfur phosphorus, and high cleanliness has good ductility.The steel band proportion is 80～85% in the flux-cored wire.So steel band quality of stability, purity etc. have directly determined the performance quality of flux-cored wire.Make the used steel band of flux-cored wire at present and mostly be soft steel such as spcc (being common cold-rolled steel strip) or 08Al, its composition and content are respectively (%):
| The trade mark | ??C | ??Si | ??Mn | ??P | ??S | ??Als | ??Ni | ??Cr | ??Cu |
| ??08Al | ??0.05～??0.12 | ??≤0.03 | ??0.25～??0.65 | ??≤0.035 | ??≤0.035 | ??0.02～??0.07 | ??≤0.25 | ??≤0.10 | ??≤0.25 |
| ??SPCC | ??≤0.12 | ??- | ??≤0.50 | ??≤0.040 | ??≤0.045 | ??≥0.015 | ??0.02～??0.06 |
The special steel strip of flux-cored wire seldom.Spcc (being common cold-rolled steel strip) or 08Al steel are used as the shell steel of flux-cored wire, and its common deficiency is: only depend on C, Si, Mn unit usually to satisfy flux-cored wire manufacturing process performance; The composition matching degree of itself and medicine core is poor, and impurity content is many, and purity is poor, and unit elongation is low, and broken belt appears in the gage of wire lack of homogeneity of making easily in the manufacturing processed, and the deposited surplus genus obdurability of welding wire is low, and unstable properties.
Summary of the invention
The invention reside in that solve to adopt spcc or 08Al steel to be used as the shell of flux-cored wire poor with the composition matching degree with the medicine core that steel exists, impurity content is many, purity is poor, unit elongation is low, broken belt appears easily, the gage of wire lack of homogeneity, the low deficiency that waits of deposited metal performance, a kind of have high strength, high cleanliness, good extension performance, low yield strength ratio characteristics are provided, and production technique is simple, low cost of manufacture is easy to realize a kind of steel for flux-cored wire jacket and the production method thereof of industrialized production.
Realize the technical measures of above-mentioned purpose:
A kind of steel for flux-cored wire jacket, it is characterized in that: the chemical ingredients of steel and weight percent are: C:0.012～0.038%, Si0.003～0.009%, Mn:0.20～0.29%, Cu0.015～0.05%, Al:0.015～0.019%, Re:0.001～0.005%, P≤0.01%, S≤0.008%, N :≤0.002%, all the other are Fe and unavoidable impurities.
The method of a kind of steel for flux-cored wire jacket of production right, its step:
1) with chemical ingredients and weight percent is: C:0.012～0.038%, Si0.003～0.009%, Mn:0.20～0.29%, Cu0.015～0.05%, Al:0.015～0.019%, Re:0.001～0.005%, P≤0.01%, S≤0.008%, N :≤0.002%, smelting procedure such as all the other steel grades for Fe and unavoidable impurities carry out desulfurizing iron, bessemerize, RH vacuum-treat and continuous casting become base;
2) carry out hot rolling: its start rolling temperature is controlled at 1030～1090 ℃, and finishing temperature is controlled at 860～920 ℃, and total rolling draft is controlled to be 90%;
4) batch: its coiling temperature is controlled at 520～580 ℃;
5) carry out pickling, single chassis after successively and carry out cold rolling, cover annealing, finishing and oiling packing.
The effect of each element and mechanism among the present invention
The special-purpose cold-rolled steel strip of flux-cored wire adopts carbon, manganese as basic strengthening element in the composition design, is equipped with Al, Cu, RE alloyed, low Si, and low S, P improve its plasticity greatly in proof strength hardness.The innovative point of composition design is to adopt rare earth, Cu, Al to unite microalloying, and strict its composition range of control, when guaranteeing the special-purpose cold-rolled steel strip intensity of flux-cored wire hardness, improve its ductility greatly, to adapt to flux-cored wire wide process application in rolling the process of pulling out.
Design of chemical composition is vital in the steel of the present invention, and it has determined its mechanical property fully to satisfy the flux-cored wire manufacture process requirement.
For promoting ferritic generation in the steel band, guarantee that steel band has low yield strength, high tensile strength, high uniform elongation, C and Mn should be controlled within the reasonable range.C is controlled at 0.012～0.038% by weight percentage, and Mn is controlled at 0.2～0.29%, can improve steel band A
R3Point promotes ferrite to generate.Suppress the segregation of Mn simultaneously, consequently effectively improved the homogeneity of metallographic structure, guaranteed the ductility of higher degree and the balance between the stretch flange formability plasticity.
Si is generally as strengthening element in the steel and reductor, and its deoxidizing capacity is better than Mn, but it reduces toughness when improving intensity, and the content height also generates in the residual steel of deoxidation products easily, is mingled with the uniform elongation that reduces steel thereby form.So Si is controlled at 0.003～0.009% by weight percentage.
Cu can improve the tensile strength of steel when content is lower, can keep good plasticity and toughness again, acts on similarly to Ni, and Ni is more rare element, Gu when content requirement is not high in steel, can adopt Cu to replace.Cu is controlled at 0.015～0.05% by weight percentage can decrease yield strength when guaranteeing tensile strength.
Add rare earth in steel after, inclusion is not only by refinement but also by nodularization.Because the nonmetal inclusion disperse distributes after adding rare earth, this also has the effect that reduces austenite grain size, increase along with rare earth element, austenite grain size reduces gradually, also be tending towards homogenizing, this helps the densification, pure, even of steel band feature organization, thereby improves uniform elongation, have the deoxidation desulfuration simultaneously concurrently, improve the anisotropic performance.Middle-weight rare earths of the present invention is controlled at 0.001～0.005% by weight percentage.
Because restriction Si content is in extremely low scope, so Al is mainly used to deoxidation and crystal grain thinning among the present invention.If but the aluminium consumption is too much, then can make steel band produce abnormal structure and the greying tendency that the promotion steel is arranged.And bring some difficulties for aspects such as smelting casting.Al is controlled at 0.015～0.019% by weight percentage among the present invention.
N, P, S belong to harmful element among the present invention, should be suppressed within the lower scope, so N is that P is less than 0.010% less than 0.002% by weight percentage, S is less than 0.008%.
The present invention has low-carbon (LC) as a kind of flux-cored wire special steel strip, low silicon, low-sulfur phosphorus, and low yield strength ratio, high cleanliness has good homogeneous ductility, is fit to the manufacturing of full position flux-cored wire, and every performance fully satisfies the flux-cored wire manufacture process requirement.By the microalloying of Al, Cu, rare earth element, when guaranteeing steel band intensity hardness, significantly improve the ductility of steel band, be very beneficial for flux-cored wire and rolling not fracture of wire of the process of pulling out.The steel band alloying element is few, smelts, rolling cost is low, and technology is simple, utilizes the big manufacturing of industrialness.
Embodiment
Be described in detail below:
Embodiment 1:
With the chemical ingredients (% by weight) of steel be: C 0.038, Si 0.003, Mn 0.29, Cu 0.05, and Al 0.019, Re:0.005, P 0.008, S 0.005, and N 0.0013, and surplus is that smelting procedures such as the steel grades of Fe and other inevitable impurity carries out desulfurizing iron, bessemerizes, RH vacuum-treat and continuous casting become base; Carry out hot rolling: its start rolling temperature is controlled at 1080 ℃, and finishing temperature is controlled at 900 ℃, and total rolling draft is controlled to be 90%; Under 580 ℃ of conditions, batch after the hot rolling; After carry out pickling, single chassis successively and carry out cold rolling, cover annealing, finishing and oiling packing.Finish to gauge specification after adopting single chassis cold rolling is 0.8mm.
After testing, its finished product steel belt performance is R
El=176MPa, R
m=325MPa, A=53%.The technical indicator superiority is that its tensile strength reaches 325MPa, and yield tensile ratio is 0.54, and unit elongation reaches 53%.Under the situation of drawing speed 25m/s, enter into drawing from steel band and go out the finished product welding wire by once, excellent property.Finished product welding wire deposited metal test-results is R
m=550MPa, R
EL=485MPa, A%=29% ,-20 ℃ of A
KVMean value is 198J.
Embodiment 2:
With the chemical ingredients (% by weight) of steel be: C 0.012, Si 0.009, Mn 0.2, Cu 0.015, and Al 0.015, Re:0.001, P 0.01, S 0.008, and N 0.002, and surplus is that smelting procedures such as the steel grades of Fe and other unavoidable impurities carries out desulfurizing iron, bessemerizes, RH vacuum-treat and continuous casting become base; Carry out hot rolling: its start rolling temperature is controlled at 1045 ℃, and finishing temperature is controlled at 875 ℃, and total rolling draft is controlled to be 90%; Under 520 ℃ of conditions, batch after the hot rolling; After carry out pickling, single chassis successively and carry out cold rolling, cover annealing, finishing and oiling packing.Cold rolling finish to gauge specification is 1.0mm.
After testing, the finished product steel belt performance is R
El=175MPa, R
m=320MPa, A=48%.The technical indicator superiority is that its tensile strength reaches 320MPa, and yield tensile ratio is 0.55, and unit elongation reaches 48%.Under the situation of drawing speed 18m/s, enter into drawing from steel band and go out the finished product welding wire by once, excellent property.Finished product welding wire deposited metal test-results is R
m=565MPa, R
EL=485MPa, A%=28% ,-20 ℃ of A
KVMean value is 156J.
Embodiment 3:
With the chemical ingredients (% by weight) of steel be: C 0.017, Si 0.005, Mn 0.255, Cu 0.025, and Al 0.017, Re:0.0021, P 0.010, S 0.007, and N 0.0019, and surplus is that smelting procedures such as Fe and other inevitable steel grades carry out desulfurizing iron, bessemerize, RH vacuum-treat and continuous casting become base; Carry out hot rolling: its start rolling temperature is controlled at 1030 ℃, and finishing temperature is controlled at 860 ℃, and total rolling draft is controlled to be 90%; Under 550 ℃ of conditions, batch after the hot rolling; After carry out pickling, single chassis successively and carry out cold rolling, cover annealing, finishing and oiling packing.Cold rolling finish to gauge specification is 0.8mm.
After testing, the finished product steel belt performance is R
El=170MPa, R
m=315MPa, A=50%.The technical indicator superiority is that its tensile strength reaches 315MPa, and yield tensile ratio is 0.54, and unit elongation reaches 50%.Under the situation of drawing speed 25m/s, enter into drawing from steel band and go out the finished product welding wire by once, excellent property.Finished product welding wire deposited metal test-results is R
m=550MPa, R
EL=480MPa, A%=27% ,-20 ℃ of A
KVMean value is 174J.
Embodiment 4:
With the chemical ingredients (% by weight) of steel be: C 0.024, Si 0.006, Mn 0.23, Cu 0.032, and Al 0.016, Re:0.0038, P 0.00, S 0.008, and N 0.0019, and surplus is that smelting procedures such as Fe and other inevitable steel grades carry out desulfurizing iron, bessemerize, RH vacuum-treat and continuous casting become base; Carry out hot rolling: its start rolling temperature is controlled at 1065 ℃, and finishing temperature is controlled at 900 ℃, and total rolling draft is controlled to be 70%; Under 570 ℃ of conditions, batch after the hot rolling; After carry out pickling, single chassis successively and carry out cold rolling, cover annealing, finishing and oiling packing.Cold rolling finish to gauge specification is 0.9mm.
After testing, the finished product steel belt performance is R
El=177MPa, R
m=325MPa, A=51%.The technical indicator superiority is that its tensile strength reaches 325MPa, and yield tensile ratio is 0.54, and unit elongation reaches 51%.Under the situation of drawing speed 22m/s, enter into drawing from steel band and go out the finished product welding wire by once, excellent property.Finished product welding wire deposited metal test-results is R
m=560MPa, R
EL=475MPa, A%=28% ,-20 ℃ of A
KVMean value is 166J.
Embodiment 5:
With the chemical ingredients (% by weight) of steel be: C 0.032, Si 0.008, Mn 0.243, Cu 0.045, and Al 0.018, Re:0.004, P 0.009, S 0.006, and N 0.0018, and surplus is that smelting procedures such as Fe and other inevitable steel grades carry out desulfurizing iron, bessemerize, RH vacuum-treat and continuous casting become base; Carry out hot rolling: its start rolling temperature is controlled at 1090 ℃, and finishing temperature is controlled at 920 ℃, and total rolling draft is controlled to be 70%; Under 580 ℃ of conditions, batch after the hot rolling, after carry out pickling, single chassis successively and carry out cold rolling, cover annealing, finishing and oiling packing.Cold rolling finish to gauge specification is 0.8mm.
After testing, the finished product steel belt performance is R
El=180MPa, R
m=325MPa, A=53%.The technical indicator superiority is that its tensile strength reaches 325MPa, and yield tensile ratio is 0.55, and unit elongation reaches 53%.Roll in flux-cored wire manufactory and to pull out, under the situation of drawing speed 25m/s, enter into drawing from steel band and go out the finished product welding wire and accomplish without any letup excellent property.Finished product welding wire deposited metal test-results is R
m=550MPa, R
EL=485MPa, A%=27% ,-20 ℃ of A
KVMean value is 183J.
Claims (2)
1. steel for flux-cored wire jacket, it is characterized in that: the chemical ingredients of steel and weight percent are: C:0.012～0.038%, Si0.003～0.009%, Mn:0.20～0.29%, Cu0.015～0.05%, Al:0.015～0.019%, Re:0.001～0.005%, P≤0.01%, S≤0.008%, N :≤0.002%, all the other are Fe and unavoidable impurities.
2. the method for the described a kind of steel for flux-cored wire jacket of production claim 1, its step:
1) with chemical ingredients and weight percent is: C:0.012～0.038%, Si0.003～0.009%, Mn:0.20～0.29%, Cu0.015～0.05%, Al:0.015～0.019%, Re:0.001～0.005%, P≤0.01%, S≤0.008%, N :≤0.002%, smelting procedure such as all the other steel grades for Fe and unavoidable impurities carry out desulfurizing iron, bessemerize, RH vacuum-treat and continuous casting become base;
2) carry out hot rolling: its start rolling temperature is controlled at 1030～1090 ℃, and finishing temperature is controlled at 860～920 ℃, and total rolling draft is controlled to be 90%;
4) batch: its coiling temperature is controlled at 520～580 ℃;
5) carry out pickling, single chassis after successively and carry out cold rolling, cover annealing, finishing and oiling packing.
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| CN2009102729551A CN101701318B (en) | 2009-11-27 | 2009-11-27 | Steel for flux-cored wire jacket and manufacturing method thereof |
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| CN2009102729551A CN101701318B (en) | 2009-11-27 | 2009-11-27 | Steel for flux-cored wire jacket and manufacturing method thereof |
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| CN101701318B CN101701318B (en) | 2011-02-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102021295A (en) * | 2010-12-21 | 2011-04-20 | 莱芜钢铁股份有限公司 | Cold-rolling steel belt for flux-cored wire and manufacture method thereof |
| CN102676913A (en) * | 2011-03-08 | 2012-09-19 | 上海梅山钢铁股份有限公司 | Cold-rolled steel strip for flux-cored wire and production method of cold-rolled steel strip |
| CN102755992A (en) * | 2012-07-30 | 2012-10-31 | 武汉钢铁(集团)公司 | Production method of cold-rolled steel strip for flux cored wire |
| CN103436778A (en) * | 2013-08-23 | 2013-12-11 | 首钢总公司 | Cold-strip steel with low-temperature toughness for flux-cored wires and production method of cold-strip steel |
| CN107937812A (en) * | 2017-11-27 | 2018-04-20 | 武汉钢铁有限公司 | High cleanliness flux-cored wire special steel strip and its manufacture method |
| CN114959476A (en) * | 2022-05-27 | 2022-08-30 | 山东钢铁集团日照有限公司 | Economical cold-rolled steel strip for flux-cored wire and production method thereof |
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2009
- 2009-11-27 CN CN2009102729551A patent/CN101701318B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021295A (en) * | 2010-12-21 | 2011-04-20 | 莱芜钢铁股份有限公司 | Cold-rolling steel belt for flux-cored wire and manufacture method thereof |
| CN102021295B (en) * | 2010-12-21 | 2012-10-03 | 山东钢铁股份有限公司 | Cold-rolling steel belt for flux-cored wire and manufacture method thereof |
| CN102676913A (en) * | 2011-03-08 | 2012-09-19 | 上海梅山钢铁股份有限公司 | Cold-rolled steel strip for flux-cored wire and production method of cold-rolled steel strip |
| CN102676913B (en) * | 2011-03-08 | 2013-11-13 | 上海梅山钢铁股份有限公司 | Cold-rolled steel strip for flux-cored wire and production method of cold-rolled steel strip |
| CN102755992A (en) * | 2012-07-30 | 2012-10-31 | 武汉钢铁(集团)公司 | Production method of cold-rolled steel strip for flux cored wire |
| CN102755992B (en) * | 2012-07-30 | 2015-08-12 | 武汉钢铁(集团)公司 | A kind of flux-cored wire cold-rolled strip production method |
| CN103436778A (en) * | 2013-08-23 | 2013-12-11 | 首钢总公司 | Cold-strip steel with low-temperature toughness for flux-cored wires and production method of cold-strip steel |
| CN107937812A (en) * | 2017-11-27 | 2018-04-20 | 武汉钢铁有限公司 | High cleanliness flux-cored wire special steel strip and its manufacture method |
| CN114959476A (en) * | 2022-05-27 | 2022-08-30 | 山东钢铁集团日照有限公司 | Economical cold-rolled steel strip for flux-cored wire and production method thereof |
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| CN101701318B (en) | 2011-02-09 |
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