CN102618779B - 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 the roll in a kind of reducing mill stand for pipe-mill, tube reducing frame, specifically relate to a kind of high rigidity, hardness gradient is little, thick and large section, without the As-cast Bainitic Ductile Iron composite roll of 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 utilization ratio and the production efficiency of milling train; reduce milling train and shut down number of times; become important topic; employing has the material in higher rolling life-span as roll material, is one of method reaching this purpose.Roll is a large amount of key parts that consume during steel rolling is produced, and conventionally requires roll working lining to have good wear resistance and red hardness, and internal layer portion should have higher intensity and good toughness.For reaching this object, the industrial centrifugal compound technology that generally adopts is produced compound roll.Working layer is alloy bainite ductile iron roll, high-speed steel roll, tungsten carbide roll etc., and its interalloy bainite ductile iron roll has the preferred material of higher cost performance ，Wei Steel tube Co., Ltd.The hardness of producing in 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, can not meet the further requirement of steel rolling to rolling stock.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of surface hardness within the scope of 70～80HSD, hardness gradient is less than 1HSD/20mm, wear resisting property is good, yield rate is high, and without the thick and large section As-cast Bainitic Ductile Iron composite roll of inverse chill casting flaw, this As-cast Bainitic Ductile Iron composite roller operational layer macrofracture is fiber crops mouthful tissues.
For achieving the above object, the present invention adopts following technical scheme to realize:
As-cast Bainitic Ductile Iron composite roll, comprises that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is comprised 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 inevitable impurity
Fe: surplus;
According to weight percentage meter, described internal layer is comprised 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：0.04～0.082%
RE: trace
Fe: surplus.
Described As-cast Bainitic Ductile Iron composite roll, comprises that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is preferably comprised 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 weight percentage meter, described internal layer is preferably comprised 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：0.04～0.082%
RE: trace
Fe: surplus.
Described As-cast Bainitic Ductile Iron composite roll, comprises that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is more preferably comprised 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 weight percentage meter, described internal layer is more preferably comprised 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.
For object of the present invention, above-mentioned provided technical scheme, mainly from following several respects, consider:
Carbon: carbon is greying forming element, and carbon content is high, the graphite of separating out is many, and number of graphite ball is many, and sphere diameter size is little, and roundness increases, and the while can reduce free cementite and improve the mobility of iron liquid; But carbon content is too high, easily form graphite floatation, foundry goods over-all properties is reduced; Therefore the carbon content control in the technical program is in above-mentioned scope.
Silicon: silicon is to promote graphite element, can reduce eutectic cementite and produce, and roll surface hardness is declined.Silicon also has material impact to bainite transformation, and silicon reduces the solubleness of carbon in austenite, and improves 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, refining eutectic group, is conducive to improve roll obdurability.Silicon amount will reduce as best one can consumption in the situation that reaching above-mentioned requirements simultaneously, avoids hardness drop excessive; Therefore the silicone content in the technical program is controlled in above-mentioned scope.
Manganese: in alloy ball iron, because sulphur and oxygen are removed when magnesium or cerium are processed, or be combined into stable compound, the Main Function of manganese forms carbide and perlite exactly, improves intensity and hardness; In thick and large casting, manganese is the significant especially element of segregation tendency, and manganese amount is too much, easily on eutectic cell border, forms carbide, reduces the mechanical property of foundry goods; Therefore the manganese content in the technical program is controlled in above-mentioned scope.
Nickel: nickel can make C curve and CCT curve move to right, suppress pearlitic transformation, delay the Cooling Austenite Transformation time, reduce bainite transformation to time sensitivity, it is to separate out to be conducive to form shellfish tissue difficult to understand to carbide that while nickel can suppress to change, energy crystal grain thinning, impel structure refinement, homogenizing, when increasing roll wear resistance, improve obdurability, because nickel price is higher; Therefore the nickel content in the technical program is controlled in above-mentioned scope.
Chromium: chromium is one of strong 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 the easy formative tissue segregation of too high chrome content, increases the obdurability that fragility reduces tissue; Therefore the chromium content in the technical program is controlled in above-mentioned scope.
Molybdenum: the matrix of molybdenum alloy ductile iron roll has very important impact.Molybdenum can improve the stability of supercooled austenite, CCT curve Medium pearlite district is significantly moved to right, and can improve hot strength and the resistance toheat of roll; Therefore the molybdenum content in the technical program is controlled in above-mentioned scope.
Niobium+vanadium: the good effect of niobium, vanadium derives from two aspects: the one, 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 dispersion-strengthened resistance to deformation.Niobium, vanadium, at NbC, VC that the cast iron crystallization initial stage forms, can be used as the crystallization nuclei of graphite pebbles, and niobium, vanadium have inoculation(effect) in magnesium iron, make the tiny rounding of graphite pebbles, be evenly distributed, reduce free cementite.Add the alloy ball iron after niobium, vanadium, dense structure, hardness drop is little, thereby reaches wear-resisting object, has improved applied at elevated temperature performance simultaneously.In addition, niobium, vanadium are strong stability perlite element, unsuitable higher; Therefore the niobium in the technical program, content of vanadium are controlled in above-mentioned scope.
Sulphur, phosphorus: sulphur, phosphorus are harmful element, all have a certain impact to nodularization, roll quality, should limit its content; Therefore the sulphur in the technical program, phosphorus content are controlled in above-mentioned scope.
Magnesium: magnesium is nodularization element, the too high easy formation secondary oxidation of its residual quantity such as is mingled with at the casting flaw, the too low nodularization effect that can not guarantee; Therefore the Mg content in the technical program is controlled in above-mentioned scope.
Titanium: the strong Ti of response capacity, when trace, has deoxidation to degas, eliminates the anti-graphitizing of O, H, N, forms the titanium carbonitride of TiN-TiC, can refinement graphite, strengthen matrix and improve wear resistance; Thereby the TiC particle of first separating out not distributing as the disperse of primary carbide forming core particle hinders the free growth refinement primary carbide of primary carbide, avoids the appearance in spoken parts in traditional operas district.Titanium elements falls for controlling high rigidity soft the key element that mouth region appears highlighting in as-cast bainite magnesium iron, for avoiding interference nodularization effect, normal and rare earth is used jointly, through overtesting, we determine that control interval is 0.03～0.15%, roller surface has higher hardness, and working lining has the processing characteristics that roll falls and do not affect in good hardness simultaneously; Therefore the titanium content in the technical program is controlled in above-mentioned scope.
Copper: copper has no adverse effects to spheroidal graphite, is mainly and adds copper, and the inside has impurity element to disturb nodularization, but the adverse consequences of the influential toughness of copper does not add copper during batching, and copper is relict element; Therefore the copper content control in the technical program is in above-mentioned scope.
Rare earth element: rare earth element can be eliminated the deleterious effect of micro-interference element, refinement graphite, improves spheroidal graphite cast iron antifading; Therefore the content of rare earth in the technical program is controlled in above-mentioned scope.
Beneficial effect of the present invention is:
1, adopt technical scheme provided by the invention, As-cast Bainitic Ductile Iron composite roll has not only guaranteed surperficial high rigidity, has also guaranteed that hardness gradient is 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 in prior art, production high rigidity thick and large section bainite ductile iron exists, yield rate reaches 100%.
Embodiment
Below by specific embodiment, the present invention is described in detail.
Embodiment 1
Grade of steel A
1: As-cast Bainitic Ductile Iron composite roll, comprises that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is comprised 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 weight percentage meter, described internal layer is comprised 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 Bainitic Ductile Iron composite roll of technical scheme provided by the invention;
Above-mentioned grade of steel A
1with grade of steel A
2carrying out inverse chill phenomenon contrasts:
Grade of steel A
1: surface hardness and hardness drop are less than 1HSD/20mm, meet the requirements, and there is no macroscopic large-area inverse chill annular section simultaneously, and the rolling life-span improves more than 10%.
Photo 1 is grade of steel A
1finished product shine:
Photo 1
Photo 2 is grade of steel A
2finished product shine:
Photo 2
By photo 1, photo 2 contrasts, can be found out, in photo 1, adopt the grade of steel A of the technical program
1have no inverse chill casting flaw phenomenon, A in photo 2
2inverse chill casting flaw phenomenon is obvious.
Embodiment 2
Grade of steel B
1: As-cast Bainitic Ductile Iron composite roll, comprises that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is comprised 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 weight percentage meter, described internal layer is comprised 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 Bainitic Ductile 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 contrasts:
Embodiment 3
Certain customer requirement is produced the sizing As-cast Bainitic Ductile 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 within the scope of 70～76HSD, working lining thickness requirement >=140mm, and at the hardness >=62HSD of 140mm place, hardness gradient is less than 1HSD/20mm, and working lining is organized as bainite.
Adopt the As-cast Bainitic Ductile Iron composite roll of the technical program, comprise that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is comprised 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 weight percentage meter, described internal layer is comprised 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.
The As-cast Bainitic Ductile Iron composite roll that adopts technique scheme, meets client's requirement.
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 hardness qualification rate, inverse chill qualification rate and useless loss rate contrasts:
Grade of steel C
1: hardness qualification rate is 100%; Without inverse chill, scrap 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 completely satisfactory is 15 (comprising what inverse chill was scrapped), and hardness qualification rate is 50%.
Claims (3)
1. As-cast Bainitic Ductile Iron composite roll, is characterized in that: comprise that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is comprised 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 inevitable impurity
Fe: surplus;
According to weight percentage meter, described internal layer is comprised 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：≥0.04～0.082%
RE: trace
Fe: surplus.
2. As-cast Bainitic Ductile Iron composite roll according to claim 1, is characterized in that: comprise that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is comprised 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 inevitable impurity
Fe: surplus;
According to weight percentage meter, described internal layer is comprised 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：≥0.04～0.082%
RE: trace
Fe: surplus.
3. As-cast Bainitic Ductile Iron composite roll according to claim 1, is characterized in that: comprise that working lining and internal layer two portions form;
According to weight percentage meter, described working lining is more preferably comprised 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 weight percentage meter, described internal layer is more preferably comprised 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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| CN1055424C (en) * | 1994-11-04 | 2000-08-16 | 吴树高 | Iron casting compound roll and its making method |
| CN101787483A (en) * | 2010-02-05 | 2010-07-28 | 常州宝菱重工机械有限公司 | Improved ductile cast iron of bainite ductile centrifugal compound ductile (I) or pearlite ductile (III ) and roller prepared by ductile cast iron |
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