CN102560018A - Oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball - Google Patents
Oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball Download PDFInfo
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- CN102560018A CN102560018A CN2011104252900A CN201110425290A CN102560018A CN 102560018 A CN102560018 A CN 102560018A CN 2011104252900 A CN2011104252900 A CN 2011104252900A CN 201110425290 A CN201110425290 A CN 201110425290A CN 102560018 A CN102560018 A CN 102560018A
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Abstract
The invention discloses an oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball. The high-hardness low-chromium multicomponent alloy casting ball contains the following components in percentage by weight: 1.5 to 2.0 percent of C, 0.3 to 1.0 percent of Mn, 2.0 to 2.8 percent of Cr, 0.78 to 0.80 percent of Si, 0.05 to 0.055 percent of Cu, less than or equal to 0.02 percent of S and less than or equal to 0.03 percent of P, wherein Fe is used as a substrate. The oil quenching heat treatment process comprises the following steps of: heating the high-hardness low-chromium multicomponent alloy casting ball to the temperature of between 950 and 1,050 DEG C, and keeping the temperature for 2 to 3 hours; performing oil cooling; after the surface temperature of the high-hardness low-chromium multicomponent alloy casting ball is reduced to be below 250 DEG C, taking the casting ball out of an oil sump, and stopping performing the oil cooling; and putting the casting ball into a tempering furnace for tempering, and after the tempering is finished, quenching the casting ball again. By the oil quenching heat treatment process, the problem of poor cast quality of the high-hardness low-chromium multicomponent alloy casting ball is solved, the casting ball does not have cracks, the hardness and toughness are improved, the antifatigue impact service life is prolonged, consumption is reduced, the ball crushing rate is low, a large number of chromium alloy resources of the country are saved, and the running cost of users is also reduced.
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 the low chromium cast ball oil quenching thermal treatment process of a kind of high firmness.
Technical background:
Chrome metal powder casting ball, casting section are a kind of grinding mediums that is widely used in powder technologies such as cement, thermoelectricity, magnetic, ore dressing; For the hardness that improves Chrome metal powder casting ball, casting section, toughness, 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 proper heat treatment technology is to improve the key of Chrome metal powder casting ball, casting section.
At present, chromium alloy casting ball, the casting section of producing both at home and abroad are divided into three kinds: high-chromium alloy casting ball, casting section, low chrome casting ball, casting section, low chrome casting ball, casting section.Chinese patent 200410041736X has announced high-chromium alloy casting ball oil quenching technology, and through the casting of the high-chromium alloy after this art breading ball, casting section, hardness is high; But product performance are unstable; And the alloy content of high-chromium alloy casting ball, casting section is high, and cost is high, and chromium resource consumption is big; Low chrome is cast ball, casting section alloy content is low, and cost is low, but product hardness is low, and impelling strength is low, and comprehensive mechanical performance is relatively poor, and customer using cost is high; Low chrome casting ball, casting section cost are moderate, handle but all just product is carried out a low-temperaturetempering both at home and abroad at present, and as-cast structure can not get changing, and its hardness, toughness, 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, cast hardness, impelling strength and the comprehensive mechanical performance of ball, casting section, reduce production costs, practice thrift alloy resource to improve low chrome.
Summary of the invention:
The objective of the invention is in order to remedy the deficiency of defectiveness; A kind of oil quenching thermal treatment process that is applicable to the low chromium multielement alloy cast ball of high firmness is provided; Adopt its hardness height of the low chromium multielement alloy cast ball of high firmness, toughness and the good combination property of this art breading; Cost performance is high, is not merely country and practices thrift a large amount of Chrome metal powder resources, has also reduced running cost for the user.
The present invention realizes through following technical scheme:
High firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: the weight percent that contains composition in the low chromium multielement alloy cast ball of said high firmness is: C:1.5-2.0, Mn:0.3-1.0; Cr:2.0-2.8; Cu:0.05-0.055, Si:0.78-0.80, S :≤0.02; P :≤0.03, matrix is iron; The low chromium multielement alloy cast ball of said high firmness adopts the oil quenching thermal treatment process, and its concrete process step comprises:
A. the low chromium multielement alloy cast ball of the as cast condition high firmness that will just from mold, take out is quantitatively packed in the special-purpose quenching frame, then is put in and heats in the quenching furnance, be heated to 950-1000 ℃ after, be incubated 2 hours-3 hours;
B. the low chromium multielement alloy cast ball of the high firmness behind the heat tracing is poured in the quenching shaking table, sunk in the quenching oil with the quenching shaking table then,, make casting ball, casting section roll freely, and constantly stir oil sump along with the moving up and down and shaking of quenching shaking table;
When treating that c. the low chromium multielement alloy cast ball surface temperature of high firmness drops to below 240 ℃, product leaves oil sump, stops oil cooling, and product is poured into hang tempering in the car type furnace, tempering temperature 500-600 ℃, tempering time 6-10 hour in the charging basket;
D. after tempering finishes, the low chromium multielement alloy cast ball of high firmness is put into organic hardening liquid once more, when treating that the low chromium multielement alloy cast ball surface temperature of high firmness drops to below 140 ℃, take out naturally cooling, get final product.
Described organic hardening liquid is mixed by following component: N
46Machinery oil 55-65%, Z 150PH 25-35%, 10%ZFT composite additive for quenching oil.
Described high firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: the described quenching oil of step (b) is an isothermal quenching oil, the kinematic viscosity 45-125mm of quenching oil in the time of 40 ℃
2/ s, flash-point are at 180-230 ℃, and oily temperature control is at 80-140 ℃.
Described high firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: the low chromium multielement alloy cast ball of described high firmness uses the yttrium-base heavy rare earth alterant to handle in process of production.
The ZFT composite additive for quenching oil that Shenzhen branch office of Beijing Linkage good industry Science and Technology Ltd. produces is the brown thick liquid, is composited by multiple additives, and additive can compare favourably with special-purpose quenching oil in machinery oil.
This product has good thermal oxidation stability, can obviously improve the work-ing life of oil product.The back workpiece surface that quenches is bright and clean, and can obtain satisfied hardness, has certain antirust ability simultaneously.
1. according to oil product cooling rate situation, select an amount of composite additive, join (the paraffinic base effect is more remarkable) in the N15 machinery oil, can use after stirring.
2. also can be added in the old quenching oil and use, consumption should be decided according to the cooling performance situation of oil product.And before interpolation, oil groove bottoms, moisture content are removed the back and used.
3. the recommendation consumption in the 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 the N15 machinery oil | ZFT?10％ |
| The 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 the low chromium multielement alloy cast ball of oil quenching high firmness; The present invention has adopted the automated control technology of special tooling with full technological process; Temperature, each warm area soaking time, oil temperature, product surface temperature and the optimum parameter of cool time in the strict control stove; Make casting ball, casting section when quenching, roll freely evenly cooling.Adopt the strong cold mode of plate-type heat exchanger, oily temperature control in the technology 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 that high firmness hang down the chromium multielement alloy cast ball oil quenching, solved high firmness and hanged down the not good enough problem of chromium multielement alloy cast ball as cast condition functional quality.
2. the low chromium multielement alloy cast ball each item technical indicator of the high firmness that adopts the present invention to handle has all been created new advanced international standard; Product flawless wherein; Hardness reaches 58 1 62HRC, and the falling-ball impact test number of times surpasses 28000 times, and heart portion and surface hardness be poor≤2HRC.
3. the low chromium multielement alloy cast ball of the high firmness that adopts the present invention to handle is compared with the low chromium multielement alloy cast ball of high firmness of existing known direct tempering technical finesse, and hardness improves, and toughness improves, and antifatigue is impacted the life-span and improved, and uses to consume to descend, and chip index is extremely low.
4. the low chromium multielement alloy cast ball use cost of the high firmness that adopts the present invention to handle is low, and cost performance is high.
5. adopt the present invention to be applicable to that the high firmness of ￠ below 120 hang down chromium multielement alloy cast ball quench treatment in oily medium.
6. adopt the present invention to be applicable to various high-temperature heater quench treatment.
Embodiment:
A kind of high firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: the weight percent that contains composition in the low chromium multielement alloy cast ball of said high firmness is: C:1.5-2.0, Mn:0.3-1.0; Cr:2.0-2.8; Si:0.78-0.80, Cu:0.05-0.055, S :≤0.02; P :≤0.03, matrix is iron; The low chromium multielement alloy cast ball of said high firmness adopts the oil quenching thermal treatment process, and its concrete process step comprises:
A. the low chromium multielement alloy cast ball of the as cast condition high firmness that will just from mold, take out is quantitatively packed in the special-purpose quenching frame, then is put in and heats in the quenching furnance, be heated to 950-1000 ℃ after, be incubated 2 hours-3 hours;
B. the low chromium multielement alloy cast ball of the high firmness behind the heat tracing is poured in the quenching shaking table, sunk in the quenching oil with the quenching shaking table then,, make casting ball, casting section roll freely, and constantly stir oil sump along with the moving up and down and shaking of quenching shaking table;
When treating that c. the low chromium multielement alloy cast ball surface temperature of high firmness drops to below 240 ℃, product leaves oil sump, stops oil cooling, and product is poured into hang tempering in the car type furnace, tempering temperature 500-600 ℃, tempering time 6-10 hour in the charging basket;
D. after tempering finishes, the low chromium multielement alloy cast ball of high firmness is put into organic hardening liquid, when treating that the low chromium multielement alloy cast ball surface temperature of high firmness drops to below 140 ℃, take out naturally cooling, get final product;
E. for guaranteeing the quality of quenching oil, to detect the quenching oil of new buying, taking regular detection with quenching oil.
Described organic hardening liquid is mixed by following component: N
46Machinery oil 60%, Z 150PH 30%, 10%ZFT composite additive for quenching oil.
Described high firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: described quenching oil is an isothermal quenching oil, the kinematic viscosity 45-125mm of quenching oil in the time of 40 ℃
2/ s, flash-point are at 180-230 ℃, and oily temperature control is at 80-140 ℃.
Described high firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: the low chromium multielement alloy cast ball of described high firmness uses the yttrium-base heavy rare earth alterant to handle in process of production.
The mechanical property and the abrasion resistance of the prepared casting abrading-ball of technology of the present invention increase substantially, and hardness is stabilized in HRc58-62, and the falling-ball impact test number of times is above 25000 times.Compare with current national standard and industry standard, the chromium content of abrading-ball 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%, concrete data such as table 1.
Table 1
Claims (3)
1. high firmness is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process, it is characterized in that: the weight percent that contains composition in the low chromium multielement alloy cast ball of described high firmness is: C:1.5-2.0, Mn:0.3-1.0; Cr:2.0-2.8; Si:0.78-0.80, Cu:0.05-0.055, S :≤0.02; P :≤0.03, matrix is iron; The low chromium multielement alloy cast ball of said high firmness adopts the oil quenching thermal treatment process, and its concrete process step comprises:
The low chromium multielement alloy cast ball of the as cast condition high firmness of just from mold, taking out is quantitatively packed in the special-purpose quenching frame, then is put in the quenching furnance and heats, be heated to 900-1050 ℃ after, be incubated 2 hours-3 hours;
B. the low chromium multielement alloy cast ball of the high firmness behind the heat tracing is poured in the quenching shaking table, sunk in the quenching oil with the quenching shaking table then,, make casting ball, casting section roll freely, and constantly stir oil sump along with the moving up and down and shaking of quenching shaking table;
When treating that c. the low chromium multielement alloy cast ball surface temperature of high firmness drops to below 240 ℃, product leaves oil sump, stops oil cooling, and product is poured into hang tempering in the car type furnace, tempering temperature 500-600 ℃, tempering time 6-10 hour in the charging basket;
D. after tempering finishes, the low chromium multielement alloy cast ball of high firmness is put into organic hardening liquid, when treating that the low chromium multielement alloy cast ball surface temperature of high firmness drops to below 140 ℃, take out naturally cooling, get final product;
Described organic hardening liquid is mixed by following component: N
46Machinery oil 55-65%, Z 150PH 25-35%, 10%ZFT composite additive for quenching oil.
2. high firmness according to claim 1 is hanged down chromium multielement alloy cast ball oil quenching thermal treatment process; It is characterized in that: the described quenching oil of step (b) is an isothermal quenching oil; The kinematic viscosity 45-125m ㎡/s of quenching oil in the time of 40 ℃, flash-point is at 180-230 ℃, and oily temperature control is at 80-140 ℃.
3. according to the low chromium multielement alloy cast ball oil quenching thermal treatment process of claim 1 described high firmness, it is characterized in that: the low chromium multielement alloy cast ball of described high firmness uses the yttrium-base heavy rare earth alterant to handle in process of production.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110425290.0A CN102560018B (en) | 2011-12-17 | 2011-12-17 | Oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball |
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|---|---|---|---|
| CN201110425290.0A CN102560018B (en) | 2011-12-17 | 2011-12-17 | Oil quenching heat treatment process for high-hardness low-chromium multicomponent alloy casting ball |
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| CN102560018B CN102560018B (en) | 2014-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103725950A (en) * | 2013-12-31 | 2014-04-16 | 南平市双友金属有限公司 | Process for producing low-chromium complex alloy grinding ball |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1150976A (en) * | 1995-11-17 | 1997-06-04 | 王宇辉 | Low-chromium cast-iron grinding ball |
| 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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- 2011-12-17 CN CN201110425290.0A patent/CN102560018B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1150976A (en) * | 1995-11-17 | 1997-06-04 | 王宇辉 | Low-chromium cast-iron grinding ball |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103725950A (en) * | 2013-12-31 | 2014-04-16 | 南平市双友金属有限公司 | Process for producing low-chromium complex alloy grinding ball |
| CN103725950B (en) * | 2013-12-31 | 2015-09-30 | 南平市双友金属有限公司 | A kind of Low chrome multielement alloy cast ball production technique |
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Address after: Shun Zhen Ming Lake Village of Tongling County in Anhui province Tongling city 244121 Patentee after: Anhui Niu Yada science and technology limited Company Address before: Shun Zhen Ming Lake Village of Tongling County in Anhui province Tongling city 244121 Patentee before: Tongling Mirror Iron Plant |