CN1044496C - Assembly guide board for multiple high chromium caststeel mill and manufacture method thereof - Google Patents
Assembly guide board for multiple high chromium caststeel mill and manufacture method thereof Download PDFInfo
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- CN1044496C CN1044496C CN97116908A CN97116908A CN1044496C CN 1044496 C CN1044496 C CN 1044496C CN 97116908 A CN97116908 A CN 97116908A CN 97116908 A CN97116908 A CN 97116908A CN 1044496 C CN1044496 C CN 1044496C
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Abstract
The present invention relates to a multiple high chromium cast steel guide board for variouss steel rolling machines to guide steel billets and a manufacturing method of the guide board. The multiple high chromium cast steel guide board comprises the following chemical components: C, Si, Mn, Cr, Ni. Mo, K, Na, Ti, RE, and balancing Fe and inevitable trace impurities. In the board, alloy with the components is used for making combined guide boards, and has the making method that green-sand mold casing is carried out for shaping, and technologies of high temperature unpacking and subcritical quenching are adopted. The present invention is mainly characterized in that a certain amount of K, Na, RE and TI are added to high chromium cast steel alloy to refine the structure of the high chromium cast steel alloy, particularly make eutectic carbide spheroidized. The board can improve the use performance of the guide board and reduce production cost.
Description
The present invention is that all kinds of shape mills import steel billet with guide plate and manufacture method thereof, belongs to technical field of steel rolling.
Guide plate is to have the blank of importing in the rolling section bar process of Steel Mill and escort the parts of effect, is requisite mould during steel rolling is produced.They are bearing the chilling and shock heating effect of thermal load, impact, high speed wearing and tearing, extruding and the water coolant of red-hot base in the process under arms, thereby require its material to have higher intensity, toughness, wear resistance, anti-chilling and shock heating performance and antioxidant property etc.It is the consumable accessory on the rolling mill, and the whole nation is annual to consume tens thousand of tons.The quality of guide plate directly has influence on the output and the quality of Steel Mill's section bar, reduces the guide plate cost, and improving guide plate work-ing life is a steel rolling industry difficult problem anxious to be solved.
Generally adopt the built-up type guide plate on the at present external shape mill.It is little that the built-up type guide plate has a volume, and advantage such as in light weight and easy for installation has also obtained applying at home.The built-up type guide plate is had relatively high expectations to material capability, except that the necessary performance of monoblock type guide plate is arranged, also sufficiently high toughness to be arranged, still generally use high nichrome to make abroad so far, but the production cost height adopts this material to be unfavorable for promoting the use of of built-up type guide plate in China.Adopt soft steel to make body, there is complex process and Wimet deficiency of peeling off easy to crack in the method in that the working position pile-up welding hard alloy is made guide plate.Make guide plate with rich chromium cast iron, it is wear-resisting, resistance toheat is all fine, but material fragility is big, and fracture accident easily takes place in the use.The guide plate of making of ordinary white cast iron, spheroidal graphite cast iron is then more difficult to satisfy production requirement.
The chemical composition and the manufacture method thereof that the purpose of this invention is to provide a kind of multiple high chromium cast steel guide plate.The present invention adopts a kind of multiple high chromium cast steel alloy to make the built-up type guide plate, and adopts wet sand casting to be shaped.Its principal feature is to add an amount of K, Na, RE and Ti in the cast steel with high chromium alloy, make its structure refinement, particularly make the nodularization of eutectic carbides group, help increasing substantially of cast steel with high chromium mechanical property, cause the raising of cast steel with high chromium guide plate use properties the most at last.In addition, in the guide plate making processes, adopt unpacking technology of elevated temperature heat and subcritical quenching technology, can reduce the guide plate production cost.
Purpose of the present invention can realize by following measure:
The chemical composition of guide plate of the present invention is (weight %):
C?0.4～1.2 Si0.8～1.8
Mn0.5～1.5 Cr12.0～18.0
Ni0.6～2.0 Mo0.6～1.2
K?0.04～0.12 Na0.05～0.15
Ti0.1～0.5,RE0.03～0.15,P＜0.06,S＜0.05，
All the other are Fe and inevitable trace impurity.
But guide plate electric furnace of the present invention production, its manufacturing technology steps is:
1. with ordinary scrap steel, the pig iron, low carbon ferrochromium, ferrosilicon, ferromanganese, molybdenum-iron and the fusing of nickel plate Hybrid Heating;
2. the stokehold is adjusted to branch and temperature is risen to 1580～1620 ℃ after qualified, adds reductor aluminium, then comes out of the stove;
Alterant, rare earth ferrosilicon and the ferrotianium that 3. will contain potassium, sodium are crushed to the fritter of granularity less than 15mm, after oven dry below 250 ℃, place the casting ladle bottom, with the method that pours in the bag molten steel are carried out composite inoculating and handle;
4. use the green sand mold moulding, pouring temperature is 1440～1480 ℃;
5. unpacking air-cooled guide plate after casting 4～6 minutes;
6. guide plate carries out subcritical quench treatment under 520～580 ℃, soaking time 2～4 hours, and air cooling is to room temperature then.
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:
C:C influences cast steel with high chromium hardness and flexible principal element, when its content was high, carbide quantity was many in the tissue, the matrix hardness height, wear resistance is good, but too high levels descends toughness, if content is low excessively, fusing point is raise, mobile decline, and reduce wear resistance, so C content is advisable with 0.4～1.2%.
Cr:Cr is partially soluble in the matrix, increases the hardening capacity and the oxidation-resistance of high chromium steel, and part forms carbide, help the increase of wear resistance and the improvement of resisting viscosity steel performance, the Cr too high levels, matrix is transformed into ferrite, wear resistance sharply descends, so Cr content is advisable with 12～18%.
Si:Si at high temperature can form fine and close oxide film, improves oxidation-resistance, but the Si too high levels causes fragility to increase, so Si content is controlled at 0.8～1.8%.
Mn:Mn can improve hardening capacity and strengthen matrix, make the stable and disperse of carbide, Mn content is less than the heat resistance that also can increase steel at 1.5% o'clock, Mn also has the deoxidation desulfuration, but when Mn content is higher, the tendency that the grain coarsening that makes steel is arranged, and the crisp susceptibility of tempering of increase steel, so Mn content is controlled at 0.5～1.5%.
Ni:Ni can improve the drag of steel to fatigue, also is present in the steel with the form of dissolving each other with iron, makes it to strengthen, Ni is owing to reduce critical transition temperature and reduce each elemental diffusion speed in the steel, thereby the hardening capacity of raising steel, but the Ni price is higher, therefore its content is controlled at 0.6～2.0%.
Mo:Mo can significantly improve the heat resistance of steel, temper resistance and hardening capacity, and Mo can also significantly reduce the hot-short tendency of steel, but add-on is too much, and little to the above-mentioned performance impact of steel, impel cost to increase on the contrary, therefore Mo content is controlled at 0.6～1.2%.
K and Na:K, Na can reduce the primary crystal Tc and the eutectic crystallization temperature of multiple high chromium cast steel, primary crystal Tc and eutectic crystallization decrease of temperature, help molten steel cold excessively at liquidus line and eutectic area, and the crystallization condensate depression of alloy increases, and nucleation rate is increased greatly, therefore, K, Na increase primary crystal austenite nucleus, the primary crystal austenite is fined, and the trend that residual molten steel was spaced mutually when the austenitic refinement of primary crystal caused eutectic reaction strengthens, and then causes the refinement of eutectic structure.In addition, K, Na optionally are adsorbed on the surface of eutectic carbides preferential growth direction when eutectic crystallization, form adsorbent thin film, hinder atoms such as Fe, Cr in the molten steel, the C eutectic carbides crystal of growing into, reduced the coarsening rate of eutectic carbides (010) preferential direction, cause (010) direction to be grown up and slow down, and (001), the increase of (100) direction coarsening rate cause eutectic carbides to become irregular lumps.K, Na not only are adsorbed on carbide and grow up according to qualifications and hinder the growth of carbide in this direction on the direction surface, and easily promote the twin of carbide to form, and cause group's nodularization of carbide morphology.The improvement of austenitic refinement of primary crystal and eutectic carbides form, help the cast steel with high chromium mechanical property, increasing substantially of impelling strength particularly, K, Na add-on are very few, and be little to the performance impact of cast steel with high chromium, add-on is too much, cause that The amount of inclusions increases in the alloy, mechanical property is also had detrimentally affect, take all factors into consideration, K content is controlled at 0.04～0.12%, and Na content is controlled at 0.05～0.15%.
Ti: the purpose that adds Ti is the tissue for the refinement steel, improves its intensity and toughness, and Ti also can improve the oxidation-resistance of steel, add-on is very few, and little to the performance impact of steel, add-on is too much, increase the hot cracking tendency of steel, so Ti content is controlled at 0.1～0.5%.
RE:RE adds the effect that has desulfurization, degasification in the steel, the fine particle of RE and liquid reactant metal generation simultaneously, the forming core effect of accelerated solidification, surfactivity RE element forms the adatom film at the mobile plane of crystal, reduce the speed of mobile ion, the crystal grain of these characteristics energy refinement multiple high chromium cast steels of RE element, the segregation of restriction dentrite improves mechanical property, oxidation-resistance and wear resistance.The RE add-on is too much, and the RE inclusion is increased, and reduce the performance of steel on the contrary, so RE content is controlled at 0.03～0.15%.
Inevitably trace impurity is to bring in the raw material, and P and S are wherein arranged, and all is harmful elements, and for the intensity, toughness and the wear resistance that guarantee guide plate, we are controlled at P content below 0.06%, and S content is controlled at below 0.05%.
The performance of alloy material also has direct relation with thermal treatment process, and it is worked out according to being:
Built-up type guide plate volume is little, and is in light weight, wall thickness (wall thickness is less than 15mm), under high temperature is unpacked air-cooled condition, elements such as C, the Cr of solid solution in austenite, Mo, Mn, Ni are difficult for separating out, and have increased the stability of high temperature austenite, and alloy structure is that austenite adds eutectic carbides under the room temperature.Heat treated purpose is to make stabilization of austenite, because guide plate is worked under comparatively high temps, remove and require higher wear resistance, also require to have certain thermotolerance and structure stability, when thermal treatment temp is low, because of containing more alloying element in the supersaturated austenite, advantages of higher stability is arranged, therefore be difficult for decomposing, thermal treatment temp is during greater than 500 ℃, and the supersaturated austenite branch parses tiny alloy carbide, and C and alloying element content reduce in the austenite thereby make, improved the Ms point, made austenite in process of cooling subsequently, be transformed into martensite.When temperature surpassed 600 ℃, supersaturated austenite all was transformed into martensite, and the proeutectoid carbide particle is significantly grown up, and the dispersity of proeutectoid carbide is reduced, and influenced the mechanical property of material.For this reason the present invention select for use thermal treatment process be 520～580 ℃ the insulation 2～4 hours after air cooling.Metallographic structure after the guide plate thermal treatment is: eutectic carbides+proeutectoid carbide+martensite+residual austenite.
Above-mentioned thermal treatment process has been cancelled quench hot technology, only need carry out one time the subcritical quench treatment of low temperature, save energy, reduce cost, simple and easy to do, low-temperature heat treatment can be guaranteed that also guide plate is indeformable, not ftracture, material material final hardness is more than 50HRC, impelling strength is more than 20J/cm, and tensile strength is greater than 840MPa, high comprehensive performance.
The invention will be further described below in conjunction with embodiment:
Embodiment:
1, batching: the consumption of various materials (weight %)
The pig iron 13.1, ordinary scrap steel 56.9,
Low carbon ferrochromium 22.4, ferromanganese 0.7,
Ferrosilicon 1.0, molybdenum-iron 1.1,
Nickel plate 0.7 contains potassium material 1.2,
Sodium-containing material 1.5, rare earth ferrosilicon 0.6
Ferrotianium 0.8.
Reductor aluminium accounts for 0.4% of molten steel weight.
2, melting: with 150 kilograms of medium-frequency induction furnace meltings
1. 19.65 kilograms of pig iron, 85.35 kilograms of ordinary scrap steels, 33.6 kilograms of low carbon ferrochromiums, 1.65 kilograms of molybdenum-irons, 1.05 kilograms of ferromanganese, 1.5 kilograms of ferrosilicon, 1.05 kilograms of nickel plates are mixed in the stove of packing into and melt;
Add 0.6 kilogram of aluminium when 2. temperature rises to 1610 ℃ and make reductor, at once go out molten steel in casting ladle, be placed with granularity in the casting ladle in advance less than 12mm, and contain potassium material, 1.05 kilograms of sodium-containing materials, 1.2 kilograms of ferrotianiums and 0.9 kilogram of rare earth ferrosilicon through 200 ℃ of 1.8 kilograms of drying;
3. use wet sand casting, pouring temperature is 1460 ℃;
4. unpacked after casting 5 minutes and cool off guide plate, spruing, cleaning undesirable root, overlap, burr with blower;
5. guide plate is put into resistance furnace, and insulation is 3 hours in the time of 550 ℃, takes out the guide plate air cooling.Carry out chemical analysis, its composition following (weight %) from guide plate sampling:
C?0.77,?Si1.13,Mn0.83,
Cr13.84,Ni0.68,Mo0.70,
K?0.07,?Na0.09,Ti0.17,
RE0.07,?S?0.03,P?0.04。
All the other are Fe.
Cutting 20mm thin slice tested for hardness on the guide plate entity is 51～53HRC.
With the Y type test block of guide plate with stove casting on cut 10mm * 10mm * 55mm sample, the impelling strength of test material is 22～26J/cm.
With the Y type test block of guide plate with stove casting on cut φ 20mm * 320mm sample, the tensile strength of test material is 847～863MPa.
Get the guide plate of the present invention use of installing, the result is as follows:
Working conditions is on the K11 frame on the 250 rod rolling mill production lines, roll φ 6.5mm wire rod, rod rolling speed 12m/sec, be 240 hours the mean life of guide plate of the present invention, 676 tons of average steel rolling amounts, be 60 hours the mean life of former rich chromium cast iron guide plate, 169 tons of average steel rolling amounts, be 177 hours the mean life of former high nickel chromium triangle guide plate, 503 tons of average steel rolling amounts.
Guide plate of the present invention compared with prior art has the following advantages:
Guide plate intensity height of the present invention, good toughness, wearability and non-oxidizability are good, and anti-chilling and shock heating performance is also fine, Do not rupture in the use procedure, non-scale, do not chap, non-stick steel, serviceability obviously is better than the rich chromium cast iron guide plate With high nichrome guide plate, production technology is simple, do not need to carry out high-temperature heat treatment, thereby production cost is low. Use Guide plate of the present invention can significantly improve the rolling mill operating rate, reduces the stocking production cost, has good economic benefit.
Claims (2)
1, a kind ofly be used for all kinds of shape mills and import steel billets with multiple high chromium cast copper guide plates, it is characterized in that the chemical ingredients of guide plate is (weight %):
C?0.4～1.2 Si0.8～1.8
Mn0.5～1.5 Cr12.0～18.0
Ni0.6～2.0 Mo0.6～1.2
K?0.04～0.12 Na0.05～0.15
Ti0.1～0.5 RE0.03～0.15
P＜0.06 S＜0.05
All the other are Fe and inevitable trace impurity.
2, as the said guide plate manufacture method of claim 1, it is characterized in that using electric furnace production, its processing step is:
1. with ordinary scrap steel, the pig iron, low carbon ferrochromium, ferrosilicon, ferromanganese, molybdenum-iron and the fusing of nickel plate Hybrid Heating;
2. temperature rises to 1580～1620 ℃, adds reductor aluminium, then comes out of the stove;
Alterant, rare earth ferrosilicon and the ferrotianium that 3. will contain potassium, sodium are crushed to the fritter of granularity less than 15mm, after oven dry below 250 ℃, place the casting ladle bottom, with the method that pours in the bag molten steel are carried out composite inoculating and handle;
4. use wet sand casting, pouring temperature is 1440～1480 ℃;
5. unpacking air-cooled guide plate after casting 4～6 minutes, spruing, cleaning undesirable root, overlap, burr;
6. guide plate carries out subcritical quench treatment under 520～580 ℃, soaking time 2～4 hours, air cooling then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116908A CN1044496C (en) | 1997-09-18 | 1997-09-18 | Assembly guide board for multiple high chromium caststeel mill and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116908A CN1044496C (en) | 1997-09-18 | 1997-09-18 | Assembly guide board for multiple high chromium caststeel mill and manufacture method thereof |
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| Publication Number | Publication Date |
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| CN1180759A CN1180759A (en) | 1998-05-06 |
| CN1044496C true CN1044496C (en) | 1999-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97116908A Expired - Fee Related CN1044496C (en) | 1997-09-18 | 1997-09-18 | Assembly guide board for multiple high chromium caststeel mill and manufacture method thereof |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441726C (en) * | 2007-07-13 | 2008-12-10 | 袁厚之 | Guide board for seamless steel pipe punching machine |
| CN102251184B (en) * | 2011-07-12 | 2012-10-24 | 北京工业大学 | Fe-Cr-B antifriction alloy containing aluminum and preparation method thereof |
| CN102337473B (en) * | 2011-09-30 | 2013-04-10 | 内蒙古包钢钢联股份有限公司 | Rare earth modification and ageing processing method of high chromium-nickel alloy steel guide plate |
| CN102517516A (en) * | 2011-12-19 | 2012-06-27 | 张家港市鼎力铸钢有限公司 | Composite microalloyed high impact energy cast steel and manufacturing method thereof |
| CN103602921B (en) * | 2013-10-29 | 2015-11-18 | 上海工程技术大学 | A kind of preparation method of cold-work die steel |
| CN104789891B (en) * | 2015-03-13 | 2017-08-29 | 鑫鹏源智能装备集团有限公司 | A kind of multi-functional roll piercing mill once perforated guide plate |
| CN107419184A (en) * | 2017-06-09 | 2017-12-01 | 太仓东旭精密机械有限公司 | A kind of high-performance handware |
| CN114836689B (en) * | 2022-04-25 | 2023-04-07 | 宁国东方碾磨材料股份有限公司 | High-chromium wear-resistant steel ball and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3692515A (en) * | 1968-07-30 | 1972-09-19 | Latrobe Steel Co | Ferrous alloys and abrasion resistant articles thereof |
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1997
- 1997-09-18 CN CN97116908A patent/CN1044496C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3692515A (en) * | 1968-07-30 | 1972-09-19 | Latrobe Steel Co | Ferrous alloys and abrasion resistant articles thereof |
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