CN102744528B - Flux-cored wire, method for manufacturing coil box bending roller, and coil box bending roller - Google Patents

Flux-cored wire, method for manufacturing coil box bending roller, and coil box bending roller Download PDF

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Publication number
CN102744528B
CN102744528B CN201110102875.9A CN201110102875A CN102744528B CN 102744528 B CN102744528 B CN 102744528B CN 201110102875 A CN201110102875 A CN 201110102875A CN 102744528 B CN102744528 B CN 102744528B
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China
Prior art keywords
coil box
bending roll
heat coil
flux
welding
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Expired - Fee Related
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CN201110102875.9A
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Chinese (zh)
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CN102744528A (en
Inventor
林剑东
何藩
谢永琴
黄平
方淑芳
孟瑜
刘勇
陈亮
宋和平
李强
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Pangang Group Steel Vanadium and Titanium Co Ltd
Panzhihua Iron and Steel Group Corp
Pangang Group Research Institute Co Ltd
Pangang Group Panzhihua Steel and Vanadium Co Ltd
Original Assignee
Pangang Group Steel Vanadium and Titanium Co Ltd
Panzhihua Iron and Steel Group Corp
Pangang Group Research Institute Co Ltd
Pangang Group Panzhihua Steel and Vanadium Co Ltd
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Application filed by Pangang Group Steel Vanadium and Titanium Co Ltd, Panzhihua Iron and Steel Group Corp, Pangang Group Research Institute Co Ltd, Pangang Group Panzhihua Steel and Vanadium Co Ltd filed Critical Pangang Group Steel Vanadium and Titanium Co Ltd
Priority to CN201110102875.9A priority Critical patent/CN102744528B/en
Publication of CN102744528A publication Critical patent/CN102744528A/en
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Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a coil box bending roller and a manufacturing method thereof. The manufacturing method includes manufacturing a roller core; overlaying a priming coat on the outer surface of a working section of the roller core; overlaying a working layer on the priming coat; and performing stress relief annealing on the coil box bending roller. A flux-cored wire used by the overlaid working layer comprises, by weight percentage, 0.16-0.6% of C, 0.5-1.1% of Mn, 0.5-1.9% of Si, 13.5-28.0% of Cr, 2-6% of V, 2-10% of Ni, 1-8% of Mo, 0.05-0.5 of Nb, 0.05-0.5% of Ti, 0.5-3% of W, 1-6% of Al, 0.02-0.5% of RE, 0-0.03% of S, 0-0.03% of P and balance Fe. By means of the technical scheme, an overlaying layer containing Cr, Al, Si, rear-earth elements and the like can be formed on the surface of the coil box bending roller so as to improve abrasion resistance and oxidation resistance of the surface of the coil box bending roller.

Description

Method and the bending roll of heat coil box of flux-cored wire, making bending roll of heat coil box
Technical field
The present invention relates to equipment of hot rolling, particularly, relate to a kind of flux-cored wire, use this flux-cored wire to make the method for bending roll of heat coil box, and make and bending roll of heat coil box by the method.
Background technology
Bending roll of heat coil box is the vitals on hot rolled plate production line, for by curling strip later roughing rolling, thereby the strip of rolling is transported to precision rolling equipment, then launches and finish rolling by precision rolling equipment.In prior art, conventionally adopt hardness to come the surface of built-up welding bending roll at the stainless steel of about HRC35 or low-carbon low-alloy steel scolder, to keep certain wearability and heat resistance.But, owing to not being to be curled with the complete angle parallel with the roll surface of bending roll the process tabularium of the curling rolling of strip, but rolled up with the form of outwardly convex a little, thereby the both sides of the width of strip are not 180 ° while contacting with bending roll, but be less than 180 °.Therefore, the two side portions of strip has slight shear action to bending roll, when particularly strip both sides contact with bending roll, easily by roll surface plucking, namely the metal of bending roll is adhered in strip, produces sticky meat phenomenon.In addition, in the time of the higher steel band of rolling intensity, because the physical property of this steel band and the material of bending roll surface overlaying approach, thereby more sticky meat.Sticky meat not only affects the surface quality of curling strip, and bending roll has reduced service life because having lost heat-resisting, wear-resisting hardfacing weld deposit.
Summary of the invention
The object of this invention is to provide a kind of can minimizing glues meat and improves service life and method and the bending roll of heat coil box of the making bending roll of heat coil box of strip surface quality.
To achieve these goals, the invention provides a kind of flux-cored wire, the percentage by weight of the composition of this flux-cored wire is that 0.16~0.6%C, 0.5~1.1%Mn, 0.5~1.9%Si, 13.5~28.0%Cr, 2~6%V, 2~10%Ni, 1~8%Mo, 0.05~0.5%N b, 0.05~0.5%Ti, 0.5~3%W, 1~6%Al, 0.02~0.5%RE, 0~0.03%S, 0~0.03%P, surplus are Fe.
In addition, the present invention also provides a kind of method of making bending roll of heat coil box, and the method comprises: step (a): make roller core; Step (b): built-up welding prime coat on the active section outer surface of described roller core; Step (c): built-up welding working lining is to obtain bending roll of heat coil box on described prime coat, and the flux-cored wire that wherein this working lining of built-up welding uses is flux-cored wire of the present invention; Step (d): described bending roll of heat coil box is carried out to stress relief annealing.
Preferably, in step (a), make described roller core by forging any one in 40Cr, 40CrMo, 40CrV, 40CrMn, 40CrNi, 30CrMo and 35CrMo.
Preferably, in step (b), the welding wire that prime coat uses described in built-up welding be H08, H08A and H08Mn 2any one in Si.
Preferably, the thickness of described prime coat is 2~4mm.
Preferably, in step (d), annealing temperature is 550~600 ℃, and annealing time is 5~8h.
Preferably, in step (c), be 5~8mm at the thickness of described overlay cladding.
The present invention also provides a kind of bending roll of heat coil box of being made up of the method for making bending roll of heat coil box of the present invention.
Pass through technique scheme, can form the overlay cladding that contains the compositions such as Cr, Al, Si, rare earth element on the surface of bending roll of heat coil box, thereby surface abrasion resistance and the non-oxidizability that can improve bending roll of heat coil box, be embodied in the service life of having improved bending roll of heat coil box.Particularly:
Chromium is the extremely important alloying element of the heat resisting steel for making bending roll of heat coil box, can form on steel surface the Cr of one deck densification 2o 3film.Cr 2o 3film can stop the corrosive gas such as oxygen, sulphur, nitrogen to spread in steel to a certain extent, also can hinder metallic atom to external diffusion, and in certain temperature range, can also form the composite protection film of the spinel-type that protective is good.On surface by the heat resisting steel at nickeliferous, chromium, form layer of Ni O-Cr 2o 3complex oxide film, can strengthen the oxidation-resistance property of steel.The high temperature oxidation resistance of heat resisting steel and its chrome content have certain relation, and in the time reaching 12% (being below percetage by weight) containing chromium, the high temperature oxidation resistance of heat resisting steel is significantly improved; In the time reaching 22% left and right containing chromium, at 1000 ℃, the high temperature oxidation resistance of heat resisting steel is extremely good, now forms one deck continuously and fine and close oxide-film on the surface of heat resisting steel.Therefore,, in method of the present invention, the flux-cored wire chrome content that forms overlay cladding is not less than 12%.
Aluminium is also oxidation resistant important alloying element in heat resisting steel, and both economical.Aluminium can form the good Al of protective on steel surface 2o 3film, its antioxygenic property is better than Cr 2o 3film.In the time reaching 6% containing Al, can make steel at 980 ℃, there is good high temperature oxidation resistance; But in the time reaching 8% containing Al, can significantly reduce toughness and the weldability of steel.Therefore,, in method of the present invention, the flux-cored wire that forms overlay cladding is no more than 6% containing Al.
Silicon can form good, the fine and close Si of protective on steel surface 2o film.Conventionally, in steel, siliceous 1% left and right Shi Neng significantly improves the high temperature oxidation resistance of steel.In addition, the effect that improves high temperature oxidation resistance when silicon, the common alloying of aluminium is better than the situation of silicon, the independent alloying of aluminium.
In addition, rare earth has significant effect to the high temperature oxidation resistance that improves steel, and reason is: (1) rare earth element can increase the adhesive force between parent metal and oxide-film, because rare earth oxide has " pinning " effect to parent metal; (2) rare earth element can increase the diffusion of chromium in steel, contributes to form Cr on the surface of steel 2o 3oxide-film.
In addition, Ti, V, Nb have stronger crystal grain thinning and solution strengthening ability, two kinds of elements add above than separately a kind of add fashionable effective.Wherein, Ti and Al combine and add the effect ratio of crystal grain thinning to only have Ti strong; V, Nb also have stronger precipitation strength ability, and they and Mo, W are carbides, and the high-temperature stability of these carbide is better, thus make the crystallite dimension of surfacing layer metal little, hardness is high, high temperature abrasion resistance and toughness better.
In addition, vanadium can form the carbide VC (HV is 2600 left and right) of high abrasion, its hardness ratio Cr 7c 3carbide is much higher.In addition, it is approximate spherical that VC is, and is conducive to highly dispersed and distributes, thereby both reduced the possibility that carbide is scratched, smashes, and protected again parent metal, improved the wearability of material.
Other features and advantages of the present invention are described in detail the specific embodiment part subsequently.
The specific embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The percentage by weight of the composition of flux-cored wire of the present invention is that 0.16~0.6%C, 0.5~1.1%Mn, 0.5~1.9%Si, 13.5~28.0%Cr, 2~6%V, 2~10%Ni, 1~8%Mo, 0.05~0.5%Nb, 0.05~0.5%Ti, 0.5~3%W, 1~6%Al, 0.02~0.5%RE, 0~0.03%S, 0~0.03%P, surplus are Fe.
Wherein, described flux-cored wire can be processed by suitable mode, for example form the batch mixing of required composition with the ferroalloy powdeies such as certain part by weight mixing ferromanganese, ferrosilicon, ferrochrome, vanadium iron, molybdenum-iron and iron powder, then by the even consolidation of batch mixing be seated in flux cored wire (normally tubulose sheetmetal), and be drawn into the diameter of regulation.Above-mentioned processing mode is to well known to a person skilled in the art mode, does not elaborate at this.It should be understood that the flux-cored wire for given composition, can prepare voluntarily by the way.
The method of making bending roll of heat coil box of the present invention comprises:
Step (a): make roller core; Step (b): built-up welding prime coat on the active section outer surface of described roller core; Step (c): built-up welding working lining is to obtain bending roll of heat coil box on described prime coat, and the flux-cored wire that wherein this working lining of built-up welding uses is flux-cored wire of the present invention; Step (d): described bending roll of heat coil box is carried out to stress relief annealing.
As mentioned above, by the overlay cladding that contains mentioned component in bending roll of heat coil box surface overlaying, can provide on bending roll of heat coil box surface good wearability and non-oxidizability, thus the sticky meat that can avoid Yin Gaowen and friction to cause.
Wherein, can adopt various suitable materials and make described roller core by various suitable modes.Preferably, in step (a), can make described roller core by forging any one in 40Cr, 40CrMo, 40CrV, 40CrMn, 40CrNi, 30CrMo and 35CrMo.
The effect of prime coat is to form transition between parent metal and working lining, and the element that affects welding effect in parent metal is played to diluting effect.Preferably, in step (b), the composition of the welding wire that prime coat uses described in built-up welding is H08, H08A and H08Mn 2any one in Si.More preferably, the thickness of described prime coat is 2~4mm.
In addition, preferably, in step (d), annealing temperature is 550~600 ℃, and annealing time is 5~8h, is welded in the inner residual stress forming of bending roll of heat coil box thereby eliminate heap.
In addition, can form at described roller core surface active section the overlay cladding of different-thickness, to meet corresponding instructions for use (being tear strength).Preferably, in step (c), the thickness of described overlay cladding is 5~8mm.
In addition, the present invention also provides a kind of bending roll of heat coil box of being made up of the method for making bending roll of heat coil box of the present invention.Below by specific embodiment, method of the present invention is described.
Embodiment 1
Use 40Cr forging to make the roller core that total length is 3450mm, wherein active section length is 1450mm, and active section diameter is 400mm, and all the other length of active section two ends are changeover portion.Wherein, the composition of 40Cr steel is as shown in table 1.
Table 1
Form on the surface of roller core active section the prime coat that thickness is 4mm by Lincoln weld.Wherein, the H08A (purchased from Xiong Xing metal material Co., Ltd of Shenzhen) that the welding wire that described prime coat uses is diameter 4mm, solder flux is the SSF solder flux that Shanghai Si Taili company produces, preheat temperature is 250 ℃, interlayer temperature is 280 ℃, current strength is 360A, and voltage is 28V, speed of welding 0.5m/min (speed of welding herein all refers to along the speed of welding of the axial direction of roller core).
To use diameter be 4mm flux-cored wire forms on prime coat by Lincoln weld overlay cladding that thickness is 5mm is to form bending roll of heat coil box.Wherein, the composition of the flux-cored wire that built-up welding is used is: 0.16C, 0.5%Mn, 0.5%Si, 13.5%Cr, 2%V, 2%Ni, 1%Mo, 0.05%N b, 0.05%Ti, 0.5%W, 1%Al, 0.02%RE, surplus are Fe, and percetage by weight sum is 100%; The SSD solder flux that built-up welding is used Shanghai Si Taili company to produce, interlayer temperature is 330 ℃, and current strength is 430A, and voltage is 32V, speed of welding 0.5m/min.
After built-up welding completes, bending roll of heat coil box is put into heating furnace and carry out stress relief annealing.Wherein, make bending roll of heat coil box 550 ℃ of heat treatments 8 hours, with stove cool to room temperature.
Embodiment 2
Use the method for embodiment 1 to make bending roll of heat coil box.Wherein, the overlay cladding that the prime coat that is 3mm by Lincoln weld at the surface of roller core active section formation thickness and thickness are 7mm is to form bending roll of heat coil box.Backing welding uses the H08 welding wire (purchased from Xiong Xing metal material Co., Ltd of Shenzhen) that diameter is 4mm, and preheat temperature is 250 ℃, and interlayer temperature is 300 ℃, and current strength is 360A, and voltage is 20V; The composition of the flux-cored wire that built-up welding working lining uses is: 0.4%C, 0.8%Mn, 1.5%Si, 19.0%Cr, 4.5%V, 6%Ni, 5%Mo, 0.3%Nb, 0.2%Ti, 2%W, 4%Al, 0.3%RE, 0.01%S, 0.02%P, surplus are Fe, and percetage by weight sum is 100%; The interlayer temperature of built-up welding is 350 ℃, and current strength is 430A, and voltage is 33V, speed of welding 0.5m/min.
Embodiment 3
Use the method for embodiment 1 to make bending roll of heat coil box.Wherein, the overlay cladding that the prime coat that is 2mm by Lincoln weld at the surface of roller core active section formation thickness and thickness are 8mm is to form bending roll of heat coil box.Backing welding uses the H08Mn that diameter is 4mm 2si welding wire (purchased from Xiong Xing metal material Co., Ltd of Shenzhen), preheat temperature is 250 ℃, and interlayer temperature is 280 ℃, and current strength is 360A, and voltage is 32V; The composition of the flux-cored wire that built-up welding working lining uses is: 0.6%C, 1.1%Mn, 1.9%Si, 28.0%Cr, 6%V, 10%Ni, 8%Mo, 0.5%Nb, 0.5%Ti, 3%W, 6%Al, 0.5%RE, 0.03%S, 0.03%P, surplus are Fe, and percetage by weight sum is 100%; The interlayer temperature of built-up welding is 360 ℃, and current strength is 430A, and voltage is 34V, speed of welding 0.5m/min.
Embodiment 4
Use the method for embodiment 1 to make bending roll of heat coil box.Wherein, after built-up welding working lining, bending roll of heat coil box is put into heating furnace and carry out stress relief annealing.Wherein, make bending roll of heat coil box 580 ℃ of heat treatments 6 hours, with stove cool to room temperature.
Embodiment 5
Use the method for embodiment 1 to make bending roll of heat coil box.Wherein, after built-up welding working lining, bending roll of heat coil box is put into heating furnace and carry out stress relief annealing.Wherein, make bending roll of heat coil box 600 ℃ of heat treatments 5 hours, with stove cool to room temperature.
Embodiment 6-11
Use the method for embodiment 1 to make bending roll of heat coil box.Wherein, use respectively 40CrMo, 40CrV, 40CrMn, 40CrNi, 30CrMo and 35CrMo forging to make roller core, the composition of 40CrMo, 40CrV, 40CrMn, 40CrNi, 30CrMo and 35CrMo steel is as shown in table 2-7.
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Comparative example
Use the method for embodiment 1 to make bending roll of heat coil box.Wherein, the Stoody107 welding wire that the welding wire that built-up welding working lining uses is produced for Shanghai Si Taili Co., Ltd, the percentage by weight of its deposited metal composition is: 0.2%C, 1.5%Mn, 0.6%Si, 2.5%Cr, 0.3%Mo, 0.03%S, 0.03%P, surplus are Fe, and percetage by weight sum is 100%.
Table 8 is depicted as case hardness (case hardness while completing) and the service life of the bending roll of heat coil box of making by the method for embodiments of the invention 1-11 and comparative example, the time that be on active service when hardfacing weld deposit come off 2mm for bending roll of heat coil box this service life.
Table 8
Numbering Hardness (HRC) Life-span
Embodiment 1 ??55 More than 1 year
Embodiment 2 ??57 More than 1 year
Embodiment 3 ??59 More than 1 year
Embodiment 4 ??55 More than 1 year
Embodiment 5 ??55 More than 1 year
Embodiment 6 ??55 More than 1 year
Embodiment 7 ??55 More than 1 year
Embodiment 8 ??55 More than 1 year
Embodiment 9 ??55 More than 1 year
Embodiment 10 ??55 More than 1 year
Embodiment 11 ??55 More than 1 year
Comparative example ??36 3 months
As known from Table 8, the method for making bending roll of heat coil box of the present invention has significantly improved service life and the wearability of bending roll of heat coil box.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (8)

1. a flux-cored wire, it is characterized in that, the percentage by weight of the composition of this flux-cored wire is that 0.16~0.6%C, 0.5~1.1%Mn, 0.5~1.9%Si, 13.5~28.0%Cr, 2~6%V, 2~10%Ni, 1~8%Mo, 0.05~0.5%Nb, 0.05~0.5%Ti, 0.5~3%W, 1~6%Al, 0.02~0.5%RE, 0~0.03%S, 0~0.03%P, surplus are Fe.
2. a method of making bending roll of heat coil box, the method comprises:
Step (a): make roller core;
Step (b): built-up welding prime coat on the outer surface of the active section of described roller core;
Step (c): built-up welding working lining is to obtain bending roll of heat coil box on described prime coat, and the flux-cored wire that wherein this working lining of built-up welding uses is flux-cored wire claimed in claim 1;
Step (d): described bending roll of heat coil box is carried out to stress relief annealing.
3. the method for making bending roll of heat coil box according to claim 2, wherein, in step (a), makes described roller core by forging any one in 40Cr, 40CrMo, 40CrV, 40CrMn, 40CrNi, 30CrMo and 35CrMo.
4. the method for making bending roll of heat coil box according to claim 2, wherein, in step (b), the welding wire that prime coat uses described in built-up welding is H08, H08A and H08Mn 2any one in Si.
5. the method for making bending roll of heat coil box according to claim 4, wherein, the thickness of described prime coat is 2~4mm.
6. the method for making bending roll of heat coil box according to claim 2, wherein, in step (d), annealing temperature is 550~600 ℃, annealing time is 5~8h.
7. according to the method for the making bending roll of heat coil box described in any one in claim 2-6, wherein, in step (c), the thickness of described overlay cladding is 5~8mm.
8. a bending roll of heat coil box, is characterized in that, this bending roll of heat coil box is made up of the method for the making bending roll of heat coil box described in any one in claim 2-7.
CN201110102875.9A 2011-04-22 2011-04-22 Flux-cored wire, method for manufacturing coil box bending roller, and coil box bending roller Expired - Fee Related CN102744528B (en)

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CN105414798A (en) * 2015-12-21 2016-03-23 四川鸿舰重型机械制造有限责任公司 Flux-cored wire for coke-breaking roll overlaying welding
CN106112311B (en) * 2016-08-05 2019-05-21 天长市通联焊业有限公司 A kind of flux-cored wire with excellent toughness
CN106282838A (en) * 2016-08-23 2017-01-04 合肥东方节能科技股份有限公司 A kind of roll wear resistant alloy material and roll Technology for Heating Processing
CN107775211B (en) * 2017-09-01 2020-04-03 苏州优霹耐磨复合材料有限公司 Flux-cored wire for wear-resistant hard-face surfacing

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JP3170165B2 (en) * 1994-12-28 2001-05-28 三菱重工業株式会社 Covered arc welding rod for Ni-based high Cr alloy
CN1289255C (en) * 2004-08-27 2006-12-13 攀钢集团攀枝花钢铁研究院 Welding flux core welding wire for continuous cast roller over laying welding
CN1280061C (en) * 2004-11-15 2006-10-18 攀钢集团攀枝花钢铁研究院 Flux-cored wire for supporting roller built-up welding

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