CN102534353B - Low-chromium multi-component alloy cast ball and preparation method thereof - Google Patents
Low-chromium multi-component alloy cast ball and preparation method thereof Download PDFInfo
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- CN102534353B CN102534353B CN201110425255.9A CN201110425255A CN102534353B CN 102534353 B CN102534353 B CN 102534353B CN 201110425255 A CN201110425255 A CN 201110425255A CN 102534353 B CN102534353 B CN 102534353B
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Abstract
The invention discloses a low-chromium multi-component alloy cast ball, which contains the following chemical components in percentage by weight: 1.9-2.2% of carbon, 0.75-0.82% of silicon, 0.22-0.9% of manganese, 2.2-2.5% of chromium, not more than 0.02% of phosphorus, not more than 0.02% of sulfur, 0.04-0.05% of copper, 0.02-0.03% of molybdenum, 0.02-0.03% of nickel, 0.01-0.02% of tungsten, 0.13-0.15% of yttrium-based heavy rare earth compound modifier and the balance of iron. The preparation method of the cast ball comprises the steps of: heating cast-state low-chromium multi-component alloy cast ball to 950-1000 DEG C, carrying out thermal insulation for 2-3 hours, carrying out oil cooling treatment, taking out the product out of an oil pool when the surface temperature of the low-chromium multi-component alloy cast ball decreases below 250 DEG C, terminating oil cooling, and tempering the product in a tempering furnace. According to the invention, the problem that the low-chromium multi-component alloy cast ball is poor in cast-state use quality is solved, the product is flawless, the hardness, toughness and anti-fatigue impact life are improved, the consumption is reduced, the ball breaking rate is low, a great amount of chromium alloy resources are saved for China, and the operating cost is lowered for users.
Description
Technical field:
The present invention relates to the thermal treatment process that Chrome metal powder cast steel and chrome alloy cast iron quench, relate in particular to a kind of Low chrome multielement alloy cast ball and quenching heat treatment technique thereof.
Technical background:
Chrome metal powder cast ball is a kind of grinding medium that is widely used in the powder technologies such as cement, thermoelectricity, magnetic, ore dressing, in order to improve the hardness, toughness of Chrome metal powder cast ball, cast segment, the comprehensive mechanical performance such as anti-corrosion, reduce consumption in use, novel process is not only being explored and researched and developed in each manufacturing enterprise and R&D institution all, and therefore selecting suitable thermal treatment process is to improve the key of Chrome metal powder cast ball, cast segment.
The chromium alloy cast ball of producing both at home and abroad at present, is divided into three kinds: high-chromium alloy cast ball, cast segment, low chrome cast ball, cast segment, low chrome cast ball, cast segment.Chinese patent 200410041736X has announced technique for oil quenching casting sphere made from high chrome alloy, and by high-chromium alloy cast ball, cast segment after this art breading, hardness is high, but product performance are unstable, and the alloy content of high-chromium alloy cast ball, cast segment is high, and cost is high, chromium resource consumption is large; Low chrome cast ball, cast segment alloy content are low, and cost is low, but product hardness is low, and impelling strength is low, and comprehensive mechanical performance is poor, and customer using cost is high; Low chrome cast ball, cast segment cost are moderate, but all just product is carried out to a low-temperaturetempering both at home and abroad at present, process, and as-cast structure can not get changing, and its hardness, toughness, the comprehensive mechanical performance such as resistance to wear are all not ideal enough.For this reason, must seek a kind of new heat treatment technics, with improve low chrome cast ball, cast segment hardness, impelling strength and comprehensive mechanical performance, reduce production costs, save alloy resource.
Summary of the invention:
The object of the invention is in order to make up defective deficiency, a kind of Low chrome multielement alloy cast ball and oil quenching thermal treatment process thereof are provided, adopt its hardness of Low chrome multielement alloy cast ball of this art breading high, toughness and good combination property, cost performance is high, be not only that country saves a large amount of Chrome metal powder resources, also for user has reduced running cost.
The present invention is achieved through the following technical solutions:
A Low chrome multielement alloy cast ball, is characterized in that: in described Low chrome multielement alloy cast ball, contain following chemical components, the weight percent of each composition is:
Carbon: 1.9-2.2%, silicon: 0.75-0.82%, manganese: 0.22-0.9% ， Chrome: 2.2-2.5%, phosphorus :≤0.02%, sulphur≤0.02%, copper: 0.04-0.05% molybdenum: 0.02-0.03%, nickel: 0.02-0.03%, tungsten: 0.01-0.02%, surplus is iron.
The preparation method of Low chrome multielement alloy cast ball as claimed in claim 1, specifically comprises the steps:
(1) first by steel scrap fusing in advance in medium-frequency induction furnace, be warming up to 1450-1550 ℃, add again silicon, manganese, Chrome, copper, molybdenum, nickel, tungstenalloy reaches desired chemical composition, then the block yttrium-base heavy rare earth compound modifier of cast ball gross weight 0.13-0.15% is put into hot metal ladle, molten and the standing 5-8 minute with molten iron punching, so that molten iron is gone bad and inoculation, molten iron after processing is used fixed its chemical element content of casting direct-reading spectrometer side, qualified molten iron is poured in abrading-ball mold by constant temperature pouring device, die sinking after cooling 10-15 minute, obtain as cast condition Low chrome multielement alloy cast ball,
(2) the as cast condition Low chrome multielement alloy cast ball just taking out from mold is quantitatively packed in Special quenching frame, be then put in quenching furnance and heat, be heated to after 950-1000 ℃, be incubated 2 hours-3 hours;
(3) Low chrome multielement alloy cast ball after heating and thermal insulation is poured in quenching shaking table, then with quenching shaking table, sunk in quenching oil, along with the moving up and down and shaking of quenching shaking table, cast ball, cast segment are rolled freely, and constantly stir oil sump;
(4) when high rigidity Low chrome multielement alloy cast ball surface temperature drops to below 240 ℃, product leaves oil sump, stops oil cooling, and product is poured into and in charging basket, hung toward tempering in car type furnace, tempering temperature 500-600 ℃, tempering time 6-10 hour;
(5) after tempering finishes, high rigidity Low chrome multielement alloy cast ball is put into organic hardening liquid, when high rigidity Low chrome multielement alloy cast ball surface temperature drops to below 140 ℃, takes out naturally cooling;
Described organic hardening liquid is mixed by following component: N
22machinery oil 55-65%, polyvinyl alcohol 25-35%, 10%ZFT composite additive for quenching oil.
Described Low chrome multielement alloy cast ball preparation method, is characterized in that: the described quenching oil of step (3) is isothermal quenching oil, the kinematic viscosity 45-125mm of quenching oil in the time of 40 ℃
2/ s, flash-point is at 180-230 ℃, and oil temperature is controlled at 80-140 ℃.
The ZFT composite additive for quenching oil that Shenzhen branch office of Beijing Linkage Jia Ye Science and Technology Ltd. produces is brown thick liquid, by multiple additives, is composited, and additive can compare favourably with special quenching oil in machinery oil.
This product has good thermal oxidation stability, can obviously improve the work-ing life of oil product.After quenching, workpiece surface is bright and clean, and can obtain more satisfied hardness, has certain antirust ability simultaneously.
1. according to oil product cooling rate situation, select appropriate composite additive, join (paraffinic base effect is more remarkable) in N15 machinery oil, after stirring, can use.
2. also can be added in old quenching oil and use, consumption should be determined according to the cooling performance situation of oil product.And use after oil groove bottom precipitation, moisture content being removed before interpolation.
3. the recommendation consumption in N15 machinery oil is: (weight ratio) 10%.
| Viscosity (40 ℃) mm/s is not more than | 20 |
| Flash-point (opening) be not less than (℃) | 150 |
| Moisture content % | 0.1 |
| Carbon residue per-cent is not more than | 1.5 |
| Be added in N15 machinery oil | ZFT 10％ |
| Cooling performance representative temperature is not less than ℃ | 600 |
| Cooling performance 800-400 is not more than a ℃ second | 4.5 |
For guaranteeing the homogeneity of oil quenching Low chrome multielement alloy cast ball, the present invention has adopted the automated control technology of special tooling and full technological process, the strict interior temperature of stove, each warm area soaking time, oil temperature, product surface temperature and the optimum parameter of cool time controlled, cast ball, cast segment are rolled freely when quenching, evenly cooling.Adopt the strong cold mode of plate-type heat exchanger, oil temperature has been controlled in technique allowed band, and has been equipped with oily detection system, guaranteed the optimum technology parameter of quenching oil.
Advantage of the present invention is:
1. adopt the present invention can realize Low chrome multielement alloy cast ball oil quenching, solved the not good enough problem of Low chrome multielement alloy cast ball as cast condition functional quality.
2. the Low chrome multielement alloy cast ball all technical that adopts the present invention to process has all been created new advanced international standard, product flawless wherein, and hardness reaches 58-61HRC, and falling-ball impact test number of times surpasses 25000 times, and heart portion and surface hardness be poor≤2HRC.
3. the Low chrome multielement alloy cast ball quality index and the high-chromium alloy cast ball that adopt the present invention to process are equal, but cost is lower than high-chromium alloy cast ball.
4. the Low chrome multielement alloy cast ball that adopts the present invention to process is compared with the Low chrome multielement alloy cast ball of existing known direct tempering technical finesse, has improved hardness, toughness, and antifatigue is impacted the life-span and improved, and chip index is extremely low.
5. the Low chrome multielement alloy cast ball use cost that adopts the present invention to process is low, and cost performance is high.
6. adopt the present invention to be applicable to the Low chrome multielement alloy cast ball of ￠ below 120 quench treatment in oily medium.
7. adopt the present invention to be applicable to various high-temperature heater quench treatment.
Embodiment:
A Low chrome multielement alloy cast ball, contains following chemical components in described Low chrome multielement alloy cast ball, and the weight percent of each composition is:
Carbon: 1.9-2.2%, silicon: 0.75-0.82%, manganese: 0.22-0.9% ， Chrome: 2.2-2.5%, phosphorus :≤0.02%, sulphur≤0.02%, copper: 0.04-0.05% molybdenum: 0.02-0.03%, nickel: 0.02-0.03%, tungsten: 0.01-0.02%, surplus is iron.
The preparation method of this Low chrome multielement alloy cast ball, specifically comprises the steps:
(1) first by steel scrap fusing in advance in medium-frequency induction furnace, be warming up to 1450-1550 ℃, add again silicon, manganese, Chrome, copper, molybdenum, nickel, tungstenalloy reaches desired chemical composition, then the block yttrium-base heavy rare earth compound modifier of cast ball gross weight 0.13-0.15% is put into hot metal ladle, molten and the standing 5-8 minute with molten iron punching, so that molten iron is gone bad and inoculation, molten iron after processing is used fixed its chemical element content of casting direct-reading spectrometer side, qualified molten iron is poured in abrading-ball mold by constant temperature pouring device, die sinking after cooling 10-15 minute, obtain as cast condition Low chrome multielement alloy cast ball,
(2) the as cast condition Low chrome multielement alloy cast ball just taking out from mold is quantitatively packed in Special quenching frame, be then put in quenching furnance and heat, be heated to after 950-1000 ℃, be incubated 2 hours-3 hours;
(3) Low chrome multielement alloy cast ball after heating and thermal insulation is poured in quenching shaking table, then with quenching shaking table, sunk in quenching oil, along with the moving up and down and shaking of quenching shaking table, cast ball, cast segment are rolled freely, and constantly stir oil sump;
(4) when high rigidity Low chrome multielement alloy cast ball surface temperature drops to below 240 ℃, product leaves oil sump, stops oil cooling, and product is poured into and in charging basket, hung toward tempering in car type furnace, tempering temperature 500-600 ℃, tempering time 6-10 hour;
(5) after tempering finishes, high rigidity Low chrome multielement alloy cast ball is put into organic hardening liquid, when high rigidity Low chrome multielement alloy cast ball surface temperature drops to below 140 ℃, takes out naturally cooling;
Described organic hardening liquid is mixed by following component: N
22machinery oil 55-65%, polyvinyl alcohol 25-35%, 10%ZFT composite additive for quenching oil.
The described quenching oil of step (3) is isothermal quenching oil, the kinematic viscosity 45-125mm of quenching oil in the time of 40 ℃
2/ s, flash-point is at 180-230 ℃, and oil temperature is controlled at 80-140 ℃.
Mechanical property and the abrasion resistance of the prepared casting abrading-ball of technique of the present invention increase substantially, and hardness is stabilized in HRc58-62, and falling-ball impact test number of times is over 18000 times.Compare with existing national standard and industry standard, abrading-ball Chrome content of the present invention on average reduces, and hardness, ball falling impact times of fatigue all improve a lot, and percentage of damage reduces by 50%, and concrete data are as table 1.
Table 1
Claims (1)
1. Low chrome multielement alloy cast ball, is characterized in that: in described Low chrome multielement alloy cast ball, contain following chemical components, the weight percent of each composition is:
Carbon: 1.9-2.2%, silicon: 0.75-0.82%, manganese: 0.22-0.9% ， Chrome: 2.2-2.5%, phosphorus :≤0.02%, sulphur≤0.02%, copper: 0.04-0.05% molybdenum: 0.02-0.03%, nickel: 0.02-0.03%,
Tungsten: 0.01-0.02%, surplus is iron;
The preparation method of described Low chrome multielement alloy cast ball, specifically comprises the steps:
(1) first by steel scrap fusing in advance in medium-frequency induction furnace, be warming up to 1450-1550 ℃, add again silicon, manganese, Chrome, copper, molybdenum, nickel, tungstenalloy reaches desired chemical composition, then the block yttrium-base heavy rare earth compound modifier of cast ball gross weight 0.13-0.15% is put into hot metal ladle, molten and the standing 5-8 minute with molten iron punching, so that molten iron is gone bad and inoculation, molten iron after processing is used casting direct-reading spectrometer to measure its chemical element content, qualified molten iron is poured in abrading-ball mold by constant temperature pouring device, die sinking after cooling 10-15 minute, obtain as cast condition Low chrome multielement alloy cast ball,
(2) the as cast condition Low chrome multielement alloy cast ball just taking out from mold is quantitatively packed in Special quenching frame, be then put in quenching furnance and heat, be heated to after 950-1000 ℃, be incubated 2 hours-3 hours;
(3) Low chrome multielement alloy cast ball after heating and thermal insulation is poured in quenching shaking table, then with quenching shaking table, sunk in quenching oil, along with the moving up and down and shaking of quenching shaking table, cast ball, cast segment are rolled freely, and constantly stir oil sump;
Described quenching oil is isothermal quenching oil, the kinematic viscosity 45-125m ㎡/s of quenching oil in the time of 40 ℃, and flash-point is at 180-230 ℃, and oil temperature is controlled at 80-140 ℃;
(4) when high rigidity Low chrome multielement alloy cast ball surface temperature drops to below 240 ℃, product leaves oil sump, stops oil cooling, and product is poured into and in charging basket, hung toward tempering in car type furnace, tempering temperature 500-600 ℃, tempering time 6-10 hour;
(5) after tempering finishes, high rigidity Low chrome multielement alloy cast ball is put into organic hardening liquid, when high rigidity Low chrome multielement alloy cast ball surface temperature drops to below 140 ℃, takes out naturally cooling;
Described organic hardening liquid is mixed by following component: N
22machinery oil 55-65%, polyvinyl alcohol 25-35%, 10%ZFT composite additive for quenching oil.
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| CN201110425255.9A CN102534353B (en) | 2011-12-17 | 2011-12-17 | Low-chromium multi-component alloy cast ball and preparation method thereof |
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| CN201110425255.9A CN102534353B (en) | 2011-12-17 | 2011-12-17 | Low-chromium multi-component alloy cast ball and preparation method thereof |
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| CN102534353B true CN102534353B (en) | 2014-04-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106981A (en) * | 1993-03-31 | 1995-08-16 | 日立金属株式会社 | Wear- and seizure-resistant roll for hot rolling |
| CN101643825A (en) * | 2009-09-04 | 2010-02-10 | 宁国市南洋铁球有限公司 | Medium chromium multielement alloy cast ball and cast segment oil quenching heat treatment technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106981A (en) * | 1993-03-31 | 1995-08-16 | 日立金属株式会社 | Wear- and seizure-resistant roll for hot rolling |
| CN101643825A (en) * | 2009-09-04 | 2010-02-10 | 宁国市南洋铁球有限公司 | Medium chromium multielement alloy cast ball and cast segment oil quenching heat treatment technique |
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Inventor after: Zhou Liyun Inventor before: Zhang Manqing Inventor before: Xiao Ying Inventor before: Dai Liang |
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Effective date of registration: 20170823 Address after: Yuanjiang City, Hunan province 413100 Lane Mountain Road No. 288 Patentee after: Zhou Liyun Address before: 247127 Copper Mt. Town, suburb of Anhui, Tongling Patentee before: Tongling Mingcheng Casting Co., Ltd. |
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Granted publication date: 20140402 Termination date: 20171217 |