CN1847439A - Guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process - Google Patents
Guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process Download PDFInfo
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- CN1847439A CN1847439A CN 200610042770 CN200610042770A CN1847439A CN 1847439 A CN1847439 A CN 1847439A CN 200610042770 CN200610042770 CN 200610042770 CN 200610042770 A CN200610042770 A CN 200610042770A CN 1847439 A CN1847439 A CN 1847439A
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- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000005096 rolling process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005516 engineering process Methods 0.000 claims description 19
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 10
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- 150000002910 rare earth metals Chemical class 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 6
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 4
- 229910001145 Ferrotungsten Inorganic materials 0.000 claims description 4
- 108010038629 Molybdoferredoxin Proteins 0.000 claims description 4
- 229910000805 Pig iron Inorganic materials 0.000 claims description 4
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 4
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 4
- 238000010114 lost-foam casting Methods 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 9
- 229910052804 chromium Inorganic materials 0.000 abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 229910052719 titanium Inorganic materials 0.000 abstract description 3
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000005496 eutectics Effects 0.000 description 10
- 239000011651 chromium Substances 0.000 description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000011733 molybdenum Substances 0.000 description 7
- 239000000956 alloy Substances 0.000 description 6
- 150000001247 metal acetylides Chemical class 0.000 description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 238000003801 milling Methods 0.000 description 5
- 238000004663 powder metallurgy Methods 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 210000001787 dendrite Anatomy 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 4
- 230000003245 working effect Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- PPWPWBNSKBDSPK-UHFFFAOYSA-N [B].[C] Chemical compound [B].[C] PPWPWBNSKBDSPK-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 239000007791 liquid phase Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention discloses one kind of guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process. Chemically, the guide and guard roller has material comprising C 0.7-1.4 wt%, Wt% 7.0-10.0 wt%, V 0.8-1.5 wt%, Cr,5.0-10.0 wt%, B 1.2-2.5 wt%, Mo<1.5 wt%, Si<1.5 wt%, Mn<1.5 wt%, RE 0.08-0.18 wt%, Mg 0.05-0.15 wt%, Ti 0.08-0.20 wt%, S<0.05 wt%, and P<0.05 wt%, except Fe and inevitable impurity. The guide and guard roller is made through electric furnace smelting and precise wax mold casting or evanescent mold casting. It has high strength, high toughness, high wear resistance, high fatigue and oxidation resistance, high quick cooling and heating resistance, and use performance obviously higher than that of high Ni-Cr cast steel guide and guard roller.
Description
Technical field
The invention belongs to technical field of steel rolling, relate to a kind of guide roll and preparation method thereof, particularly a kind of is all kinds of guiding steel billet in high speed wire rolling machine guide rolls and preparation method thereof.
Background technology
For the continous way bar wire rod rolling mill, in, the entrance and exit of finishing mill adopts rolling guide mostly because environment for use is abominable, thereby guide roll becomes main consumable accessory.In addition, because the Modern High-Speed milling train is very high to the dimension precision requirement of guide roll, thereby cause the consumption of guide roll very big.In high line was produced, generally all more than 50m/s, the revolution of import guide roll was up to more than the 260r/s for roll speed.Guide roll will bear high temperature (about 1000 ℃) when rolling, the slip of line, bar high-speed cruising and the abrasive wear of rolling resistance and oxide compound.Meanwhile, when the coarse and setting accuracy of, guide roll working face low when guide roll material hardness processing is not high, make in the guide roll working process local pressure excessive, hammer scale is piled up, is adhered to the working face of guide roll, and adheres interlock with it and lost efficacy.In addition, because guide roll is carried out Forced water cooling, guide roll bears the alternating thermal stress effect that swashs thermal quench repeatedly and easily produces thermal fatigue destruction.
Physical dimension and the steel grade that abroad provides be provided the guide roll of present domestic use, forms through precision casting.Safe and reliable under high-speed rolling for guaranteeing guide roll, domestic cobalt-baseds, Ni-based, tungsten cobalt-based and the high ferrochrome base casting alloys of adopting are made guide roll more.Chinese invention patent CN1609256 discloses the method for a kind of powder metallurgy steel rolling guide roller and manufacturing thereof.By material optimization and powder metallurgy liquid phase sintering technology, obtained the steel rolling guide roller of excellent property.The powder stock composition of powder metallurgy steel rolling guide roller is: Cr, 8%～20%; Mo, 0.8%～3.6%; W, 0.5%～2%; Ni, Co and Cu are 3.5%～7%; V, 0.3%～1.2%; BN, 0.1%～0.5%; C, 1.8%～2.5%; Amide waxe powder 0.5%; Tensio-active agent 0.3%～1%; Surplus is an iron powder.The manufacture method of this powder metallurgy steel rolling guide roller may further comprise the steps substantially: a. batching and batch mixing; B. compression moulding; C. sintering; D. thermal treatment; E. mechanical workout.The hardness of powder metallurgy steel rolling guide roller is HRC50～63, bending strength 1000～1300Mpa, radial crushing strength 1500～1800Mpa, impelling strength α
k3.9～5J/cm
2, tensile strength sigma
b800～1200MPa can use 3～5 order of classes or grades at school continuously.Although this guide roll wear resistance is fine, fragility is big, and easily embrittlement influences the normal operation of steel rolling equipment in the use.
Chinese patent CN2552617 discloses a kind of steel rolling rolling guide roller of composite structure, is used to guide rolled piece centering to enter roll pass.It is made up of the body of roll and the rolling bearing that is installed in it, it is characterized in that the described body of roll compoundly constitutes by encircling in sintering metal outer shroud and the aluminium alloy, in interior ring rolling bearing is installed, between outer shroud and the interior ring, all adopt stationary fit to connect between interior ring and the bearing.Because the hardness height of outer shroud, interior ring in light weight, rotational inertia is little, has comprehensively improved the wear-resistant life-span on guide roll surface.But this combination guide roll complicated process of preparation, production efficiency is low, and the guide roll working lining is the bigger pottery of fragility, is prone in the use and peels off, and influences the ordinary production of steel rolling.
Chinese patent CN2571515 discloses a kind of milling train rolling deflector roll, and this milling train rolling deflector roll is with the machining of deflector roll matrix process, cleaning, adopts adhering method, and the wolfram varbide cover is bonded together with matrix.More than this milling train rolling deflector roll wolfram varbide cover hardness HRA80, have higher wear resistance, splitting resistance, improve 10～15 times than wrought alloy steel, cast alloy iron deflector roll its comprehensive work-ing life, and this milling train rolling deflector roll is applicable to line, merchant bar mill, light-section mill and splitting rolling.This deflector roll exists wolfram varbide cover and the caducous deficiency of deflector roll matrix in complete processing complexity and the use.
Chinese invention patent CN1693527 discloses a kind of cobalt less multi element high speed tool steel and manufacture method thereof, can be used to produce roll and collars and deflector roll, and the chemical ingredients of this steel grade (weight %) is C:1.8-2.2; Si:0.5-1; Mn:0.5-1; S:＜0.05; P:＜0.05; Cr:4-6; V:4-6; Mo:4-6; W:＜2; Ni:0.8-1.2; Nb:0.2; Ti:0.05-0.1; Mg:0.005-0.01; RE:0.05-0.1.The outstanding high-carbon of this invention, high molybdenum, high vanadium.Simultaneously the rare precious metal cobalt is removed from material, saved material cost; The present invention adopts the intermediate frequency furnace smelting to adopt the yttrium-base heavy rare earth alloy to carry out the rotten processing in stokehold simultaneously, and material structure is fine and closely woven, has realized that the disperse shape of cocrystalization compound distributes, and has reduced structural stress.But molybdenum content is too high in this material, the production cost height, and W content is too low, has reduced the hot hardness and the red hardness of material, is unfavorable for improving the high temperature abrasion resistance of material.
European patent 726236-A discloses a kind of ceramic guide roll that is used for hot-rolled steel, mainly by Si
3N
4Sintering forms in the time of 1100-1300 ℃ under nitrogen protection, has excellent solidity to corrosion and wear resistance, is difficult for steel bonding, has improved the stocking surface quality.But ceramic guide roll complicated process of preparation, and material fragility is big, thermal fatigue property is relatively poor, in the course of hot rolling, easily embrittlement and peeling off.
Summary of the invention
The purpose of this invention is to provide a kind of guiding steel billet in high speed wire rolling machine guide roll and preparation method thereof.Guide roll utilizes electrosmelting, adopt the cast of cured mould precision casting or lost-foam casting method, its principal feature is in no Cobalt High Speed Steel, add boron, improve the wear resistance of material, in addition, reduce the higher molybdenum of price in the rapid steel, the add-on of vanadium, have excellent high temperature resistance polishing machine in order to ensure guide roll, suitably increase W content.In addition, in rapid steel, add an amount of rare-earth and Mg-titanium compound modifier, make its structure refinement, particularly make eutectic carbides suspension and isolation, help increasing substantially of rapid steel mechanical property, cause the raising of rapid steel guide roll use properties the most at last.
In order to achieve the above object, the present invention realizes by following technical measures:
A kind of guiding steel billet in high speed wire rolling machine guide roll is characterized in that the guide roll that makes mainly contains the chemical ingredients of following weight percent: C, 0.7～1.4; W, 7.0～10.0; V, 0.8～1.5; Cr, 5.0～10.0; B, 1.2～2.5; Mo＜1.5; Si＜1.5; Mn＜1.5; RE, 0.08～0.18; Mg, 0.05～0.15; Ti, 0.08～0.20; S＜0.05; P＜0.05; Surplus is Fe and undetectable trace impurity.
Above-mentioned guiding steel billet in high speed wire rolling machine adopts common electrosmelting with the preparation method of guide roll, it is characterized in that processing step is:
1) with ordinary scrap steel, the pig iron, ferrotungsten, vanadium iron, ferrochrome, ferro-boron, molybdenum-iron, ferrosilicon and the fusing of ferromanganese Hybrid Heating;
2) stokehold be adjusted to branch qualified after, liquid steel temperature is risen to 1550 ℃～1600 ℃, add reductor aluminium, then come out of the stove;
3) magniferous alterant, rare earth ferrosilicon and ferrotianium are crushed to the fritter of granularity, after oven dry below 260 ℃, place the casting ladle bottom, adopt the method that pours in the bag that molten steel is carried out composite inoculating and handle less than 18mm;
4) with cured mould casting method or lost-foam casting method cast guide roll, the pouring molten steel temperature is 1400 ℃～1450 ℃;
5) guide roll for cast carries out anneal after the polishing cleaning, and its technology is to be incubated 2h～4h, the cold or air cooling of stove after stove is chilled to 550 ℃ then down at 880 ℃～950 ℃;
6) guide roll is carried out roughing after, carry out means of isothermal quenching again, its technology is electric furnace or salt bath furnace internal heating to 1050 ℃～1180 ℃, behind insulation 1.5h～3h, directly isothermal 2h～4h, air cooling then in 280 ℃～360 ℃ salt bath; Carry out temper subsequently, its technology is at 500 ℃～580 ℃ insulation 3h～6h, the cold or air cooling of stove then, and tempering twice under identical technology, is refined to specified dimension at last and gets final product.
The performance of alloy material is by the metallographic structure decision, and certain tissue depends on chemical ingredients and thermal treatment process, and chemical ingredients of the present invention is to determine like this:
Owing to contain alloying elements such as a large amount of tungsten, molybdenum, chromium, vanadium, have very high normal temperature hardness in the rapid steel, particularly valuable is; Compare with common material, rapid steel has excellent red hardness, still remains on more than the HRC55 in the time of 500 ℃, has the excellent high-temperature wear resistance, therefore, selects for use rapid steel to make guide roll.
In the rapid steel guide roll except containing strong carbide forming elements such as more tungsten, chromium, contain higher carbon content simultaneously, have only when carbide forming element and carbon content and satisfied fixed when concerning in the alloy carbide molecular formula, the hardening effect of proeutectoid carbide is just best, has guaranteed that rapid steel has higher red hardness and wear resistance.According to the guide roll work characteristics, suitably improve chromium content to 5%～10% in the rapid steel, improve chromium content and can improve the rapid steel oxidation-resistance, prevent that guide roll from using oxidation taking place.Because the price of molybdenum and v element is higher, so the add-on of molybdenum and vanadium is less in the rapid steel guide roll.In order to improve the high temperature wear resistant performance of rapid steel guide roll, W content is controlled at 7.0%～10.0%.In addition, added 1.2%～2.5% boron in rapid steel, the solid solution capacity of boron in high speed steel substrate is very low, adds main boride and the boron carbon compound that forms high rigidity in the rapid steel, can obviously improve the wear resistance of rapid steel.Boron promotes the suspension of carbide in heat-processed and group's spheroidization in the rapid steel in addition in addition, helps rapid steel intensity and flexible and improves.
Add an amount of rare earth in the rapid steel guide roll, can reduce S in the molten steel, O content, increase the condensate depression of eutectic solidification, make the eutectic structure refinement, rare earth is a surface active element simultaneously, be enriched in the austenite dendrites growth front, hinder austenite and grow up refine austenite dendrites, because the refinement of austenite dendrites, solidifying the later stage, the eutectic molten steel molten bath that forms owing to segregation between austenite dendrites diminishes, thereby makes the eutectic carbides refinement.Add an amount of titanium in the rapid steel guide roll, TiC can have precedence over the MC carbide and form in the high speed molten steel, and TiC can be used as the effective heterogeneous core of MC carbide forming core, impels the MC carbide refinement.Add an amount of magnesium in the rapid steel guide roll, when eutectic crystallization, magnesium optionally is adsorbed on the surface of eutectic carbides preferential growth direction, form adsorbent thin film, hinder atoms such as W, Mo in the molten steel, the Cr eutectic carbides crystal of growing into, reduced the coarsening rate of eutectic carbides preferential direction, impelled eutectic carbides spherical by synusia shape turn agglomerate.Therefore, the adding of rapid steel guide roll middle-weight rare earths-magnesium-titanium can the refinement matrix, improves carbide morphology and distribution, helps improving the obdurability and the wear resistance of rapid steel.
Rapid steel guide roll annealed purpose is in order to improve processing characteristics, adopts salt bath quenching, mainly is in order to obtain the bainite structure of obdurability and excellent in abrasion resistance, and tempering mainly is in order to eliminate stress stabilizing tissue.
The present invention compared with prior art has following characteristics:
(1) the guide roll hardness height of the present invention's preparation, high temperature abrasion resistance is good, and improve 3～5 times than steel alloy guide roll commonly used work-ing life.
(2) guide roll intensity of the present invention and toughness height, non-cracking, cracked and peeling phenomenon appearance in the use, and guide roll non-stick steel of the present invention, stocking any surface finish.
(3) guide roll of the present invention serves as the main alloying element that improves wear resistance with tungsten, the boron of China's abundant, does not contain expensive cobalt, and the molybdenum that price is high, v element add-on are also less, so production cost is lower.
(4) guide roll of the present invention is shaped with the conventional cast method, and preparation technology is simple, the production efficiency height.
Embodiment
The embodiment that provides below in conjunction with the contriver describes in further detail the present invention.
Embodiment 1:
The guide roll of present embodiment adopts the melting of 500kg medium-frequency induction furnace, and its manufacturing technology steps is:
(1) with ordinary scrap steel, the pig iron, ferrotungsten, vanadium iron, ferrochrome, ferro-boron, molybdenum-iron, ferrosilicon and the fusing of ferromanganese Hybrid Heating.
(2) stokehold is adjusted to branch and temperature is risen to 1590 ℃ after qualified, adds the aluminium deoxidation that accounts for molten steel total amount 0.12%, then comes out of the stove.
(3) magniferous alterant, rare earth ferrosilicon and ferrotianium are crushed to the fritter of granularity, after 230 ℃ of oven dry, place the casting ladle bottom, with the method that pours in the bag molten steel is carried out composite inoculating and handle less than 18mm.
(4) pour into a mould guide roll with lost-foam casting method, the pouring molten steel temperature is 1440 ℃.
(5) guide roll after the cast carries out anneal after the polishing cleaning, and its technology is 930 ℃ of insulation 2.5h down, air cooling after stove is chilled to 550 ℃ then.
(6) guide roll carries out means of isothermal quenching after roughing, and its technology is at electric furnace internal heating to 1150 ℃, behind the insulation 2h, and directly isothermal 2.5h, air cooling then in 330 ℃ salt bath; Carry out temper subsequently, its technology is at 550 ℃ of insulation 5h, air cooling then, and tempering twice under the same process, is refined to specified dimension at last.The composition of rapid steel guide roll sees Table 1, and mechanical property sees Table 2.
The composition (wt%) of table 1 rapid steel guide roll
| Element | C | W | V | Cr | B | Mo | Si | Mn | RE | Mg | Ti | S | P | Fe |
| Composition | 1.33 | 7.74 | 1.48 | 6.99 | 1.51 | 1.08 | 1.17 | 0.82 | 0.13 | 0.07 | 0.15 | 0.028 | 0.037 | Surplus |
Table 2 rapid steel guide roll mechanical property
| Hardness HRC | 600 ℃ red hardness HRC | Tensile strength MPa | Impelling strength kJ/m 2 | Fracture toughness property MPa.m 1/2 |
| 65.8 | 60.5 | 905 | 153 | 30.7 |
Embodiment 2:
The guide roll of present embodiment adopts the melting of 300kg medium-frequency induction furnace, and its manufacturing technology steps is:
(1) with ordinary scrap steel, the pig iron, ferrotungsten, vanadium iron, ferrochrome, ferro-boron, molybdenum-iron, ferrosilicon and the fusing of ferromanganese Hybrid Heating.
(2) stokehold is adjusted to branch and temperature is risen to 1570 ℃ after qualified, adds the aluminium deoxidation that accounts for molten steel total amount 0.10%, then comes out of the stove.
(3) magniferous alterant, rare earth ferrosilicon and ferrotianium are crushed to the fritter of granularity, after 240 ℃ of oven dry, place the casting ladle bottom, with the method that pours in the bag molten steel is carried out composite inoculating and handle less than 18mm.
(4) with cured mould casting method cast guide roll, the pouring molten steel temperature is 1425 ℃.
(5) guide roll carries out anneal after the polishing cleaning, and its technology is 900 ℃ of insulation 3h down, and stove is cold then.
(6) after the guide roll roughing, carry out means of isothermal quenching, its technology is at salt bath furnace internal heating to 1100 ℃, behind the insulation 2.5h, and directly isothermal 2.3h, air cooling then in 300 ℃ salt bath; Carry out temper subsequently, its technology is that stove is cold then at 520 ℃ of insulation 5.5h, and tempering twice under the same process, is refined to specified dimension at last.The composition of rapid steel guide roll sees Table 3, and mechanical property sees Table 4.
The composition (wt%) of table 3 rapid steel guide roll
| Element | C | W | V | Cr | B | Mo | Si | Mn | RE | Mg | Ti | S | P | Fe |
| Composition | 1.01 | 8.30 | 0.97 | 7.51 | 1.85 | 1.13 | 1.22 | 0.75 | 0.09 | 0.14 | 0.10 | 0.031 | 0.036 | Surplus |
Table 4 rapid steel guide roll mechanical property
| Hardness HRC | 600 ℃ red hardness HRC | Tensile strength MPa | Impelling strength kJ/m 2 | Fracture toughness property MPa.m 1/2 |
| 66.2 | 60.7 | 894 | 150 | 30.9 |
Get guide roll machine examination on having carried out on the high-speed rod-rolling mill finishing mill of the foregoing description preparation, rolling φ 5.5mm wire rod, material is a straight carbon steel, roll speed 120m/s.Test-results shows that the average steel transportation amount of guide roll of the present invention is 3670 tons.Compare with other guide roll, rapid steel guide roll of the present invention has that intensity height, good toughness, wear resistance are good, thermal fatigue resistance and oxidation-resistance are good, anti-chilling and shock heating performance is good, not embrittlement in the use, do not peel off, do not chap, advantage such as non-stick steel, improve 3～5 times than high nichrome cast steel guide roll work-ing life, the prolongation in work-ing life is stopped work in the production and is handled (replacing guide roll) time decreased, and average class output is brought up to 675 tons/class by 650 tons/class.Guide roll production technique of the present invention is simple, and valuable alloy addition is few, and production cost is low.Use guide roll of the present invention can significantly improve the rolling mill operating rate, reduce the stocking production cost, have good economic benefits.
Claims (2)
1. a guiding steel billet in high speed wire rolling machine guide roll is characterized in that, the guide roll that makes mainly contains the chemical ingredients of following weight percent: C, 0.7～1.4; W, 7.0～10.0; V, 0.8～1.5; Cr, 5.0～10.0; B, 1.2～2.5; Mo＜1.5, Si＜1.5, Mn＜1.5, RE, 0.08～0.18; Mg, 0.05～0.15; Ti, 0.08～0.20; S＜0.05, P＜0.05, surplus is Fe and inevitable trace impurity.
2, the described guiding steel billet in high speed wire rolling machine of claim 1 adopts common electrosmelting with the preparation method of guide roll, it is characterized in that processing step is:
1) with ordinary scrap steel, the pig iron, ferrotungsten, vanadium iron, ferrochrome, ferro-boron, molybdenum-iron, ferrosilicon and the fusing of ferromanganese Hybrid Heating;
2) stokehold be adjusted to branch qualified after, liquid steel temperature is risen to 1550 ℃～1600 ℃, add reductor aluminium, then come out of the stove;
3) magniferous alterant, rare earth ferrosilicon and ferrotianium are crushed to the fritter of granularity, after oven dry below 260 ℃, place the casting ladle bottom, adopt the method that pours in the bag that molten steel is carried out composite inoculating and handle less than 18mm;
4) with cured mould casting method or lost-foam casting method cast guide roll, the pouring molten steel temperature is 1400 ℃～1450 ℃;
5) guide roll for cast carries out anneal after the polishing cleaning, and its technology is to be incubated 2h～4h, the cold or air cooling of stove after stove is chilled to 550 ℃ then down at 880 ℃～950 ℃;
6) guide roll is carried out roughing after, carry out means of isothermal quenching again, its technology is electric furnace or salt bath furnace internal heating to 1050 ℃～1180 ℃, behind insulation 1.5h～3h, directly isothermal 2h～4h, air cooling then in 280 ℃～360 ℃ salt bath; Carry out temper subsequently, its technology is at 500 ℃～580 ℃ insulation 3h～6h, the cold or air cooling of stove then, and tempering twice under identical technology, is refined to specified dimension at last and gets final product.
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| CNB2006100427708A CN100370050C (en) | 2006-04-30 | 2006-04-30 | Guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process |
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| CNB2006100427708A CN100370050C (en) | 2006-04-30 | 2006-04-30 | Guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process |
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| CN100370050C CN100370050C (en) | 2008-02-20 |
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