CN102618779A - As-cast bainite ductile cast iron composite roll - Google Patents
As-cast bainite ductile cast iron composite roll Download PDFInfo
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Abstract
The invention discloses an as-cast bainite ductile cast iron composite roll. A work layer comprises the following components in percentage by weight: 2.9-3.6 percent of C, 1.0-2.0 percent of Si, 0.5-1.0 percent of Mn, less than or equal to 0.1 percent of P, less than or equal to 0.03 percent of S, 2.5-3.5 percent of Ni, 0.5-1.0 percent of Cr, 0.5-1.2 percent of Mo, 0.03-0.15 percent of Ti, 0.005-0.06 percent of RE, less than or equal to 0.4 percent of Cu, 0.05-0.1 percent of Nb+V, 0.04-0.1 percent of Mg, other inevitable impurities and the balance of Fe component; and an inner layer comprises the following components in percentage by weight: 3.0-3.6 percent of C, 1.6-2.8 percent of Si, 0.3-0.9 percent of Mn, less than or equal to 0.1 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of Ni, less than or equal to 0.03 percent of Cr, less than or equal to 0.8 percent of Mo, trace amount of Re and the balance of Fe component.
Description
Technical field
The present invention relates to a kind of reducing mill stand of pipe-mill, roll in the tube reducing frame of being used for, specifically relate to a kind of high firmness, hardness gradient is little, the as-cast bainite spheroidal graphite cast iron composite roll of thick and large section, no inverse chill.
Background technology
Along with the develop rapidly of modern weldless steel tube industry and improving constantly of mill milling speed; How further to improve the utilization ratio and the production efficiency of milling train; Reduce milling train and shut down number of times; Having become important topic, adopted the material with higher rolling life-span as roll material, is one of method that reaches this purpose.Roll is the key part of mass consumption during steel rolling is produced, and requires the roll working lining to have good wear resistance and red hardness usually, and internal layer portion should have higher intensity and good toughness.For reaching this purpose, generally adopt centrifugal compounding technology to produce compound roll in the industry.Working layer is alloy bainite ductile iron roll, high-speed steel roll, tungsten carbide roll etc., and its interalloy bainite ductile iron roll has high cost performance, is the preferred material of Steel tube Co., Ltd.The hardness of producing in the prior art is high, and hardness gradient is little, and the good alloy casting state bainite ductile cast iron roll of wear resisting property, and inverse chill casting flaw phenomenon is serious, and yield rate is low, has satisfied not the further requirement of steel rolling to rolling stock.
Summary of the invention
Deficiency to prior art; The object of the present invention is to provide a kind of surface hardness in 70～80HSD scope; Hardness gradient is less than 1HSD/20mm, and wear resisting property is good, and yield rate is high; And the thick and large section as-cast bainite spheroidal graphite cast iron composite roll that does not have inverse chill casting flaw, this as-cast bainite spheroidal graphite cast iron composite roller operational layer macrofracture are fiber crops mouthful tissues.
For realizing above-mentioned purpose, the present invention adopts following technical scheme to realize:
As-cast bainite spheroidal graphite cast iron composite roll comprises working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining is made up of following component:
C：2.9～3.6％
Si：1.0～2.0％
Mn：0.5～1.0％
P：≤0.1％
S：≤0.03％
Ni：2.5～3.5％
Cr：0.5～1.0％
Mo：0.5～1.2％
Ti：0.03～0.15％
Re：0.005～0.06％
Cu：≤0.4％
Nb+V：0.05～0.1％
Mg：0.04～0.1％
Other unavoidable impurities
Fe: surplus;
According to the weight percentage meter, described internal layer is made up of following component:
C：3.0～3.6％
Si：1.6～2.8％
Mn：0.3～0.9％
P：≤0.1％
S：≤0.03％
Ni：≤3.0％
Cr：≤0.3％
Mo：≤0.8％
Mg：≥0.04％
Re: trace
Fe: surplus.
Described as-cast bainite spheroidal graphite cast iron composite roll comprises working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining preferably is made up of following component:
C：3.2～3.6％
Si：1.0～1.5％
Mn：0.5～0.8％
P：≤0.1％
S：≤0.03％
Ni：2.8～3.2％
Cr：0.5～0.8％
Mo：0.6～1.0％
Ti：0.03～0.05％
Re：0.015～0.05％
Cu：≤0.4％
Nb+V：0.05～0.1％
Mg：0.04～0.1％
Other impurity≤0.05%
Fe: surplus;
According to the weight percentage meter, described internal layer preferably is made up of following component:
C：3.0～3.6％
Si：1.6～2.8％
Mn：0.3～0.9％
P：≤0.1％
S：≤0.03％
Ni：≤3.0％
Cr：≤0.3％
Mo：≤0.4％
Mg：≥0.04％
Re: trace
Fe: surplus.
Described as-cast bainite spheroidal graphite cast iron composite roll comprises working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining more preferably is made up of following component:
C：3.55％
Si：1.42％
Mn：0.76％
P：0.031％
S：0.006％
Ni：2.78％
Cr：0.74％
Mo：0.77％
Ti：0.046％
Re：0.009％
Cu：0.09％
Nb+V：0.07％
Mg：0.091％
Fe: surplus;
According to the weight percentage meter, described internal layer more preferably is made up of following component:
C：3.35％
Si：2.35％
Mn：0.37％
P：0.027％
S：0.007％
Ni：2.15％
Cr：0.11％
Mo：0.27％
Mg：0.068％
Re：0.015
Fe: surplus.
To the object of the invention, the above-mentioned technical scheme that provides, mainly consider from following several respects:
Carbon: carbon is the greying forming element, and carbon content is high, and the graphite quantity of then separating out is many, and number of graphite ball is many, and the sphere diameter size is little, and roundness increases, and the while can reduce free cementite and improve the flowability of iron liquid; But carbon content is too high, forms graphite floatation easily, and the foundry goods over-all properties is reduced; So the carbon content in the present technique scheme is controlled in the above-mentioned scope.
Silicon: silicon is to promote graphite element, can reduce eutectic cementite and produce, and makes roll roll surface decrease of hardness.Silicon also has material impact to bainite transformation, and silicon reduces the solubleness of carbon in austenite, and improves the eutectoid transformation temperature, thereby reduces austenitic stability, shortens the incubation period of bainite transformation.But part silicon adds with the form of nucleating agent, can increase graphite nuclei, and refining eutectic group helps improving the roll obdurability.The silicon amount avoids the hardness drop excessive reaching under the situation of above-mentioned requirements and will reducing consumption as best one can simultaneously; So the silicone content in the present technique scheme is controlled in the above-mentioned scope.
Manganese: in alloy ball iron, because sulphur and oxygen are removed, perhaps be combined into stable compound when magnesium or cerium processing, the main effect of manganese is exactly to form carbide and perlite, improves intensity and hardness; Manganese is the significant especially element of segregation tendency in thick and large casting, and the manganese amount is too much, is prone to form carbide on the eutectic cell border, reduces the mechanical property of foundry goods; So the manganese content in the present technique scheme is controlled in the above-mentioned scope.
Nickel: nickel can make C curve and CCT curve move to right, and suppresses pearlitic transformation, delays the supercooled austenite fringe time; Reduce bainite transformation to time sensitivity, it is to separate out to help forming shellfish tissue difficult to understand that while nickel can suppress to change carbide, the ability crystal grain thinning; Impel structure refinement, homogenizing; When increasing the roll wear resistance, improve obdurability, because the nickel price is higher; So the nickel content in the present technique scheme is controlled in the above-mentioned scope.
Chromium: chromium is one of intensive carbide forming element.The quantity of carbide increases along with the increase of chromium content, and the hardness of roll rises simultaneously, and the hard formation degree of depth is deepened, the also corresponding raising of the wear resistance of the body of roll; But too high chrome content is prone to the formative tissue segregation, increases the obdurability that fragility reduces tissue; So the chromium content in the present technique scheme is controlled in the above-mentioned scope.
Molybdenum: molybdenum has very significant effects to the matrix of alloy ductile iron roll.Molybdenum can improve the stability of supercooled austenite, CCT curve Medium pearlite district is significantly moved to right, and can improve the hot strength and the resistance toheat of roll; So the molybdenum content in the present technique scheme is controlled in the above-mentioned scope.
Niobium+vanadium: the good effect of niobium, vanadium derives from two aspects: the one, and niobium, vanadium can make metal grain refinement, homogeneous microstructure; The 2nd, niobium, vanadium can form the hard phase particle of fine-stabilization, and these particles are uniformly distributed in the matrix of alloy, play the dispersion-strengthened resistance to deformation.Niobium, vanadium can be used as the crystallization nuclei of graphite pebbles at NbC, VC that the cast iron crystallization initial stage forms, and niobium, vanadium have inoculation(effect) in magnesium iron, make the tiny rounding of graphite pebbles, be evenly distributed, reduce free cementite.Alloy ball iron behind adding niobium, the vanadium, dense structure, the hardness drop is little, thereby reaches attrition resistant purpose, has improved the high temperature use properties simultaneously.In addition, niobium, vanadium are strong stability perlite element, and be unsuitable higher; So niobium, content of vanadium in the present technique scheme are controlled in the above-mentioned scope.
Sulphur, phosphorus: sulphur, phosphorus are harmful element, and nodularization, roll quality are all had certain influence, should limit its content; So sulphur, phosphorus content in the present technique scheme are controlled in the above-mentioned scope.
Magnesium: magnesium is the nodularization element, and the too high easy formation secondary oxidation of its residual quantity such as is mingled with at casting flaw, crosses lowly can not guarantee the nodularization effect; So the Mg content in the present technique scheme is controlled in the above-mentioned scope.
Titanium: the strong Ti of response capacity has deoxidation to degas when trace, eliminates the anti-graphitizing of O, H, N, forms the titanium carbonitride of TiN-TiC, but refinement graphite, strengthens matrix and improve wear resistance; Thereby the TiC particle of separating out earlier that does not distribute as the disperse of primary carbide forming core particle hinders the refinement primary carbide of freely growing of primary carbide, avoids the appearance in spoken parts in traditional operas district.Titanium elements falls the key element that the inverse chill district appears in the as-cast bainite magnesium iron for control high firmness soft; For avoiding interference the nodularization effect; Normal and rare earth uses jointly, and through overtesting, we confirm that control interval is 0.03～0.15%; Roller surface has higher hardness, and working lining has the processing characteristics that better hardness is fallen and do not influence roll simultaneously; So the titanium content in the present technique scheme is controlled in the above-mentioned scope.
Copper: copper has no adverse effects to spheroidal graphite, is mainly to add copper, and the inside has impurity element to disturb nodularization, but the influential flexible adverse consequences of copper does not add copper during batching, and copper is relict element; So the copper content in the present technique scheme is controlled in the above-mentioned scope.
REE: REE can be eliminated the deleterious effect of micro-interference element, refinement graphite, and improving the spheroidal graphite cast iron fade resistance can; So the content of rare earth in the present technique scheme is controlled in the above-mentioned scope.
Beneficial effect of the present invention is:
1, adopt technical scheme provided by the invention, as-cast bainite spheroidal graphite cast iron composite roll has not only guaranteed surperficial high firmness, has also guaranteed hardness gradient less than 1HSD/20mm, and wear resisting property is good, and yield rate reaches 100%.
2, adopt technical scheme provided by the invention, eliminated the big area inverse chill casting flaw phenomenon that production high firmness thick and large section bainite ductile iron exists in the prior art, yield rate reaches 100%.
Fig. 1 is grade of steel A among the embodiment 1
1Finished product shine;
Fig. 2 is grade of steel A among the embodiment 1
2Finished product shine;
Fig. 3 is grade of steel B among the embodiment 2
1With grade of steel B
2Carry out the contrast table that hardness and hardness gradient compare;
Embodiment
Through specific embodiment, the present invention is done detailed description below.
Embodiment 1
With reference to figure 1,2, grade of steel A
1: as-cast bainite spheroidal graphite cast iron composite roll comprises working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining is made up of following component:
C：3.55％
Si：1.42％
Mn：0.76％
P：0.031％
S：0.006％
Ni：2.78％
Cr：0.74％
Mo：0.77％
Ti：0.046％
Re：0.009％
Cu：0.09％
Nb+V：0.07％
Mg：0.091％
Fe: surplus;
According to the weight percentage meter, described internal layer is made up of following component:
C：3.35％
Si：2.35％
Mn：0.37％
P：0.027％
S：0.007％
Ni：2.15％
Cr：0.11％
Mo：0.27％
Mg：0.068％
Re：0.015
Fe: surplus.
Grade of steel A
2: with grade of steel A
1With batch, do not adopt the as-cast bainite spheroidal graphite cast iron composite roll of technical scheme provided by the invention;
Above-mentioned grade of steel A
1With grade of steel A
2Carrying out the inverse chill phenomenon compares:
Grade of steel A
1: surface hardness and hardness drop meet the requirements less than 1HSD/20mm, do not have macroscopic large-area inverse chill annular section simultaneously, and the rolling life-span improves more than 10%.
Can find out by Fig. 1, Fig. 2 contrast, adopt the grade of steel A of present technique scheme among Fig. 1
1Do not see inverse chill casting flaw phenomenon, A among Fig. 2
2Inverse chill casting flaw phenomenon is obvious.
Embodiment 2
With reference to figure 3, grade of steel B
1: as-cast bainite spheroidal graphite cast iron composite roll comprises working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining is made up of following component:
C：3.42％
Si：1.4％
Mn：0.74％
P：0.033％
S：0.006％
Ni：2.8％
Cr：0.74％
Mo：0.79％
Ti：0.042％
Re：0.0139％
Cu：0.12％
Nb+V：0.06％
Mg：0.07％
Fe: surplus;
According to the weight percentage meter, described internal layer is made up of following component:
C：3.1％
Si：2.65％
Mn：0.35％
P：0.027％
S：0.007％
Ni：1.86％
Cr：0.19％
Mo：0.18％
Mg：0.082％
Re：0.015％
Fe: surplus.
Grade of steel B
2: with grade of steel B
1With batch, do not adopt the as-cast bainite spheroidal graphite cast iron composite roll of technical scheme provided by the invention;
Above-mentioned grade of steel B
1With grade of steel B
2Carrying out hardness and hardness gradient compares:
Embodiment 3
Certain customer requirement is produced the sizing as-cast bainite spheroidal graphite cast iron composite roll that a kind of specification is φ 711.2/ φ 279.45 * 431.8; Its surface hardness of this roll of customer requirement is in 70～76HSD scope; Working lining thickness requirement >=140mm; And hardness >=62HSD at the 140mm place, hardness gradient is less than 1HSD/20mm, and working lining is organized as bainite.
Adopt the as-cast bainite spheroidal graphite cast iron composite roll of present technique scheme, comprise working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining is made up of following component:
C：3.52％
Si：1.36％
Mn：0.72％
P：0.042％
S：0.007％
Ni：2.69％
Cr：0.69％
Mo：0.77％
Ti：0.04％
Re：0.016％
Cu：0.2％
Nb+V：0.08％
Mg：0.087％
Fe: surplus;
According to the weight percentage meter, described internal layer is made up of following component:
C：3.24％
Si：2.59％
Mn：0.32％
P：0.031％
S：0.005％
Ni：1.43％
Cr：0.16％
Mo：0.14％
Mg：0.061％
Re：0.012％
Fe: surplus.
Adopt the as-cast bainite spheroidal graphite cast iron composite roll of technique scheme, meet requirement of client.
Embodiment 4
Grade of steel C
1: adopt following technical scheme, 30 of a collection of three stove casting rolls;
Grade of steel C
2: with 30 of conventional material casting rolls;
Above-mentioned grade of steel C
1With grade of steel C
2Carrying out qualified hardness rate, inverse chill qualification rate and useless loss rate compares:
Grade of steel C
1: the qualified hardness rate is 100%; No inverse chill is scrapped, inverse chill qualification rate 100%, the inverse chill loss rate 0 of giving up.
Grade of steel C
2: wherein inverse chill seriously causes have 16 that scrap, and the useless loss rate of inverse chill reaches 53.33%.Hardness is satisfactory fully to be 15 (comprising what inverse chill was scrapped), and the qualified hardness rate is 50%.
Claims (3)
1. as-cast bainite spheroidal graphite cast iron composite roll is characterized in that: comprise working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining is made up of following component:
C：2.9～3.6％
Si：1.0～2.0％
Mn：0.5～1.0％
P：≤0.1％
S：≤0.03％
Ni：2.5～3.5％
Cr：0.5～1.0％
Mo：0.5～1.2％
Ti：0.03～0.15％
Re：0.005～0.06％
Cu：≤0.4％
Nb+V：0.05～0.1％
Mg：0.04～0.1％
Other unavoidable impurities
Fe: surplus;
According to the weight percentage meter, described internal layer is made up of following component:
C：3.0～3.6％
Si：1.6～2.8％
Mn：0.3～0.9％
P：≤0.1％
S：≤0.03％
Ni：≤3.0％
Cr：≤0.3％
Mo：≤0.8％
Mg：≥0.04％
RE: trace
Fe: surplus.
2. as-cast bainite spheroidal graphite cast iron composite roll according to claim 1 is characterized in that: comprise working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining is made up of following component:
C：3.2～3.6％
Si：1.0～1.5％
Mn：0.5～0.8％
P：≤0.1％
S：≤0.03％
Ni：2.8～3.2％
Cr：0.5～0.8％
Mo：0.6～1.0％
Ti：0.03～0.05％
Re：0.015～0.05％
Cu：≤0.4％
Nb+V：0.05～0.1％
Mg：0.04～0.1％
Other unavoidable impurities
Fe: surplus;
According to the weight percentage meter, described internal layer is made up of following component:
C：3.0～3.6％
Si：1.6～2.8％
Mn：0.3～0.9％
P：≤0.10％
S：≤0.03％
Ni：≤3.0％
Cr：≤0.3％
Mo：≤0.4％
Mg：≥0.04％
Re: trace
Fe: surplus.
3. as-cast bainite spheroidal graphite cast iron composite roll according to claim 1 is characterized in that: comprise working lining and internal layer two portions composition;
According to the weight percentage meter, described working lining more preferably is made up of following component:
C：3.55％
Si：1.42％
Mn：0.76％
P：0.031％
S：0.006％
Ni：2.78％
Cr：0.74％
Mo：0.77％
Ti：0.046％
Re：0.009％
Cu：0.09％
Nb+V：0.07％
Mg：0.091％
Fe: surplus;
According to the weight percentage meter, described internal layer more preferably is made up of following component:
C：3.35％
Si：2.35％
Mn：0.37％
P：0.027％
S：0.007％
Ni：2.15％
Cr：0.11％
Mo：0.27％
Mg：0.068％
Re：0.015
Fe: surplus.
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