CN101509101B - 6CrW2SiMoV for large/medium-sized roller - Google Patents
6CrW2SiMoV for large/medium-sized roller Download PDFInfo
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- CN101509101B CN101509101B CN2009101189823A CN200910118982A CN101509101B CN 101509101 B CN101509101 B CN 101509101B CN 2009101189823 A CN2009101189823 A CN 2009101189823A CN 200910118982 A CN200910118982 A CN 200910118982A CN 101509101 B CN101509101 B CN 101509101B
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Abstract
The invention relates to a high performance and quality big-and-middle-sized steel applied to rollers: 6CrW2SiMoV, belonging to the field of alloy junction tool. According to wt%, the chemical components comprise: C: 0.60-0.70, Si: 0.5-0.8, Mn: less than or equal to 0.40, P: 0.0001-0.02, S: 0.0001-0.015, Cr: 1.20-1.50, W: 2.20-2.70, Mo: 0.20-0.40, V: 0.05-0.15, N: 0.02-0.05, and the balance of Fe. In the invention, elements such as Cr, Mo, V, N and the like are added to further strengthen comprehensive performance of the components. In the process of casting and heat treatment, more dispersing carbide precipitation is adopted to restrict growth of crystal grains, so that relatively high obdurability can be obtained at the state of tempering, and higher quenching hardness and abrasive resistance are provided; micro alloy element of vanadium exists in the steel in the form of compound and in the state of solid solution, which is expressed in that the carbonitride thereof is precipitated due to deformation induction to effectively pin austenite crystal boundary to prevent the crystal grains from growing up; meanwhile, carbonitride of the elements of V and the like are precipitated on crystal boundary and dislocation to prevent recrystallization and dislocation movement, inhibit recrystallization process, reduce thermal hypersensitivity of the steel, increase wearing resistance of the materials and enhance anti-oxidation decarburization sensitivity. As a result, the roller materials have better material property and stability, thus being capable of replacing import products and meeting the request for utilization of modern rollers.
Description
Technical field
The invention belongs to the alloy tool steel field.
Background technology
Domestic steel rolling industry is by great amount of investment, introduces that external most advanced equipment is fast-developing to get up, and the roll industry is then mainly by self-reliance, constantly technological transformation, enlarging and promote to develop.Compare with the steel rolling industry, the development of roll industry is slower, experiences more hardly, and supply exceed demand for the low-grade product of domestic roll, the product surplus, and manufactory competitively demands a lower price, and high-grade high-quality roll is under-supply, relies on the situation of import to fail all the time thoroughly to be changed.In recent years, the roll that the large H-shaped steel milling train uses also need rely on import, the compound half steel roller shell that Heavy Section Steel and strip-mill strip are badly in need of, high chromium steel, semi-high speed steel, high-speed steel roll and big moldeed depth quench-hardened case working roll and supporting roll, though domestic can small serial production, but the product of producing can't be stablized technical indicator and the performance that reaches international like product, can't satisfy the requirement of using and supply of present-day mill comprehensively.
The big-and-middle-sized roll of high-performance high-quality steel 6CrW2SiMoV, the present invention adds to have solution strengthening, dispersion-strengthened concurrently and delay the trace alloying element that carbide is separated out on the basis of Notch Ductile Steel 6CrW2Si, by increasing micro-molybdenum alloy and W elements acting in conjunction, when structural transformations such as forging, thermal treatment, separate out with dispersing carbide more, growing up of restriction crystal grain, obtain higher strength and toughness under the Annealed Strip and make, have higher quenching hardness and abrasive wear resistance; The vanadium trace alloying element is present in the steel with compound and solid solution condition, showing as its carbonitride separates out because of deformation induced, effectively the pinning austenite grain boundary can not grown up crystal grain, the carbonitride of elements such as while V is deposited on crystal boundary and the dislocation, stop recrystallize and dislocation motion, suppress the carrying out of recrystallization process, reduced the hot supersensitivity of steel, increase the wear resistance of material simultaneously, improved anti-oxidant decarburization susceptibility.The roll material performance is better, stable, can import substitutes satisfy the service requirements of present-day mill.
Summary of the invention
Usually realize the whole synthesis performance of further strengthening material by interpolation Cr, Mo, units such as V, N at existing Notch Ductile Steel 6CrW2Si, the present invention proposes a kind of employing trace alloying element and strengthen, improve the tool steel overall performance, expand the use field of tool material, provide new thinking for solving the big-and-middle-sized roll of high-performance high-quality with steel, for high-performance high-quality roll provides innovative technology with the performance optimization of steel, promote the production of production domesticization fully of steel rolling industry.
The big-and-middle-sized roll steel of high-performance high-quality of the present invention, by weight percentage by following elementary composition: C:0.60～0.70, Si:0.5～0.8, Mn :≤0.40, P:0.0001～0.02, S:0.0001～0.015, Cr:1.20～1.50, W:2.20～2.70, Mo:0.20～0.40, V:0.05～0.15, N:0.02～0.05, all the other are Fe and unavoidable impurities.By this composition range, adopt electric furnace just to refine-LF refining-esr-forging process route.Technology such as innovated that LF refining process top slag control techniques, nitrogen pick-up technology and inclusion modification are handled and control forging-control is cold.Strict control harmful element content is to improve the purity and the Composition Control precision of steel.
The big-and-middle-sized roll of high-performance high-quality of the present invention steel 6CrW2SiMoV realizes the whole synthesis performance of further strengthening material by adding Cr, Mo, elements such as V, N.Forging, separating out with dispersing carbide more during thermal treatment, the growing up of restriction crystal grain, and make acquisition higher strength and toughness Annealed Strip under, have higher quenching hardness and abrasive wear resistance; The vanadium trace alloying element is present in the steel with compound and solid solution condition, showing as its carbonitride separates out because of deformation induced, effectively the pinning austenite grain boundary can not grown up crystal grain, the carbonitride of elements such as while V is deposited on crystal boundary and the dislocation, stop recrystallize and dislocation motion, suppress the carrying out of recrystallization process, reduced the hot supersensitivity of steel, increase the wear resistance of material simultaneously, improved anti-oxidant decarburization susceptibility.The roll material performance is better, stable, can import substitutes satisfy the service requirements of present-day mill.The fine precipitation of control AlN is separated out in the material forging in addition, to suppress austenite recrystallization crystal grain and grain growth.The mechanical property that an amount of AlN or TiN can improve steel in the steel can be controlled autstenitic grain size, crystal grain thinning effectively.
The big-and-middle-sized roll of described high-performance high-quality steel 6CrW2SiMoV, by electroslag remelting technique control composition of inclusions, the refinement inclusion particle, the germinating and the expansion of reduction crackle make it have high fatigue strength.Inclusion comprises sulfide, aluminum oxide, silicate and spherical oxide etc. in this new steel grade.Steel inclusion is through after the hot-work, may become shapes such as rectangular, spindle or ball, wherein the back both help the raising of toughness and cutting ability.By aluminium deoxidation and interpolation alloy denaturing treatment smelting technology, with control inclusion morphology, size, content, distribution and deformation parameter, to improve the mechanical property and the equal orientation performance of steel, also can weaken crack initiation and expansion improve fatigue strength.
The big-and-middle-sized roll of the high-performance high-quality steel 6CrW2SiMoV that the present invention produces, microstructure is perlite+carbide, grain fineness number is 6～10 grades; Mechanical property (+200 ℃ of tempering of quenching) is Rm 〉=2850MPa, Rel 〉=1550MPa, A
Ku2〉=11.5J.
Relevant alloying element is described below in the effect of steel among the present invention:
C:0.60～0.70%, carbon has the greatest impact to the hardness and the wear resistance of tool steel, is one of the most effective strengthening element, is again the most cheap chemical element simultaneously.But the too high meeting of carbon content obviously reduces the plasticity and the toughness of steel.
Si:0.5～0.8%, silicon can significantly be strengthened austenite, has stronger solid solution strengthening effect.But too high silicon reduces toughness and other processing performances of steel.
Mn :≤0.40%, as the inclusion element, should strict control, when the too high levels of manganese, be easy to occur bainite structure, worsen the toughness of steel, and to processing performances such as heat, cold working generation adverse influence.
P:0.0001-0.02%, phosphorus belongs to harmful first impurity element at steel grade among the present invention, easily forms banded structure, increases the cold shortness of steel.Therefore content is low more good more.
S:0.0001-0.015%, chalcogen an amount of among the present invention easily forms banded structure in harmful first impurity element, increases the red brittleness of steel.Therefore content is low more good more.
Cr:1.20～1.50%, chromium can increase the hardening capacity of steel, can improve hardness and the wear resistance of alloy according to steel, and good temper resistance is arranged.
W:2.20～2.70%, tungsten can strengthen hardening capacity and hardness in steel, except that forming carbide, partly dissolve in and form sosoloid in the iron, can significantly strengthen the wear resistance and the temper resistance of steel, because the carbon tungsten compound that forms can stop the gathering of carbide, can reduce the superheated susceptivity of steel simultaneously.
Mo:0.20～0.40%, molybdenum improves the hardening capacity and the temper resistance of steel, and its effect is apparently higher than the effect of tungsten, and a spot of alloy adds, and can increase the drag of steel to distortion, cracking and wearing and tearing.
V:0.05～0.15%, vanadium can form stable compound with carbon, ammonia, oxygen, mainly is that the form with carbide exists, and plays thinning microstructure and crystal grain, reduces superheated susceptivity, improves the intensity and the toughness of steel, strengthens temper resistance and wear resistance.
N:0.02～0.05%, the residual aluminium in nitrogen and the steel is combined into AlN, as grain-size fining agent and separate out promotor, effectively stops AUSTENITE GRAIN COARSENING, obtains tiny ferrite crystal grain, helps improving the toughness of steel.
Steel grade provided by the invention is examined by big-and-middle-sized roll technology index, and can use big-and-middle-sized roll.Steel grade of the present invention has the following advantages:
1, cost performance height has been optimized the steel grade mechanical property.Compare with existing roll matter steel, the manufacturing cost increase is not very big, and the steel grade mechanical property is optimized by a relatively large margin, compares with imported materials and items, and production cost descends fairly obvious.The obdurability of instrument steel grade, the optimum matching of cost performance have been realized.
2, use properties excellence.Compare with existing roll stell, hardness, wear resistance, depth of hardening zone and plasticity and toughness all have raising in various degree, and tests such as the fatigue test of member show, its use properties excellence.
3, the production of steel grade, preparation technology are simple.Compare with traditional non-hardened and tempered steel, adopt electric furnace just to refine-LF refining-esr-forging process route, production technique is easy to control and grasps, and quality of item and structure property reach the requirement of regulation.
Embodiment
Further specify the present invention below in conjunction with concrete embodiment.
Inventive embodiments
The big-and-middle-sized roll steel of the high-performance high-quality that faces the future that the present invention relates to, by weight percentage by following elementary composition: C:0.60～0.70, Si:0.5～0.8, Mn :≤0.40, P:0.0001～0.02, S:0.0001～0.015, Cr:1.20～1.50, W:2.20～2.70, Mo:0.20～0.40, V:0.05～0.15, N:0.02～0.05, all the other are Fe.The big-and-middle-sized roll of described high-performance high-quality steel 6CrW2SiMoV, microstructure is perlite+carbide, grain fineness number is 6～10 grades; Mechanical property (+200 ℃ of tempering of quenching) is Rm 〉=2850MPa, Rel 〉=1550MPa, A
Ku2〉=11.5J.The preparation method is: (1) smelts and alloying: electrosmelting, and tapping, employing external refining to chemical ingredients scope meet the requirements, the protection cast; The esr refining; (2) it is cold that control is forged in control: steel billet is 1000～1200 ℃ in the soaking temperature of process furnace, opens and forges 1000～1150 ℃ of temperature, and 850～920 ℃ of finishing temperatures, the speed of cooling of forging are 30～100 ℃/min.
The steel grade design mix according to the present invention adopts electric arc furnace just to refine-LF refining-esr-forging process route, and test is carried out chemical composition analysis and mechanical property detection with steel.
Described refining just adds the high-quality steel scrap in the stove, smelt and should keep dry with raw and auxiliary material, harmful elements such as the phosphorus in the strict control steel, arsenic, lead; Tapping temperature is 1580～1650 ℃.
The time of described external refining is 30～50 minutes, and in the refined alloy process, all deoxidation alloyings add Cr, Mo, Al alloy, V, N alloy etc. after finishing successively; Carry out calcium after the refining and handle, promote to add come-up and " sex change " of foreign material.
Described esr operation adopts the melt cinder resistance heat to melt consumable electrode, splashes into the molten bath with the drop form by slag bath, and consecutive solidification becomes electroslag ingot from bottom to top in water mold.
In the forging operation, steel billet is 1000～1200 ℃ in the soaking temperature of process furnace, 1000～1150 ℃ of start rolling temperatures, and 850～920 ℃ of final forging temperatures, the speed of cooling of forging are 30～100 ℃/min.
Claims (1)
1. one kind big-and-middle-sized roll steel, it is characterized in that, the chemical ingredients scope is by weight percentage: C:0.60～0.70, Si:0.5～0.8, Mn :≤0.40, P:0.0001～0.02, S:0.0001～0.015, Cr:1.20～1.50, W:2.20～2.70, Mo:0.20～0.40, V:0.05～0.15, N:0.02～0.05, all the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101189823A CN101509101B (en) | 2009-03-11 | 2009-03-11 | 6CrW2SiMoV for large/medium-sized roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101189823A CN101509101B (en) | 2009-03-11 | 2009-03-11 | 6CrW2SiMoV for large/medium-sized roller |
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| Publication Number | Publication Date |
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| CN101509101A CN101509101A (en) | 2009-08-19 |
| CN101509101B true CN101509101B (en) | 2010-04-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528382B (en) * | 2010-12-10 | 2014-06-25 | 上海重型机器厂有限公司 | Manufacture method of cold-rolled roller |
| JP5672255B2 (en) * | 2012-02-21 | 2015-02-18 | 新日鐵住金株式会社 | Manufacturing method of forged steel roll |
| CN106319348B (en) * | 2016-10-27 | 2018-12-25 | 马钢(集团)控股有限公司 | A kind of v n micro alloying petroleum drill string crossover coupling steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2014193C1 (en) * | 1992-07-06 | 1994-06-15 | Ветер Владимир Владимирович | Fusing composition |
| CN101270446A (en) * | 2008-04-25 | 2008-09-24 | 常州宝隆冶金设备制造有限公司 | Roller |
-
2009
- 2009-03-11 CN CN2009101189823A patent/CN101509101B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2014193C1 (en) * | 1992-07-06 | 1994-06-15 | Ветер Владимир Владимирович | Fusing composition |
| CN101270446A (en) * | 2008-04-25 | 2008-09-24 | 常州宝隆冶金设备制造有限公司 | Roller |
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| CN101509101A (en) | 2009-08-19 |
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