CN1165865A - Heat treatment process of medium-high carbon low alloyed steel forged ball and overhead rollaway type quenching appts. - Google Patents
Heat treatment process of medium-high carbon low alloyed steel forged ball and overhead rollaway type quenching appts. Download PDFInfo
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- CN1165865A CN1165865A CN 97100608 CN97100608A CN1165865A CN 1165865 A CN1165865 A CN 1165865A CN 97100608 CN97100608 CN 97100608 CN 97100608 A CN97100608 A CN 97100608A CN 1165865 A CN1165865 A CN 1165865A
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Abstract
A heat treatment method for wrought middle-carbon or high-carbon low-ally steel ball includes quenching in water medium and tempering in oil medium, and features that the ball is quenched in roll mode on a quencing apparatus with one or more inclined tracks whose inclination is fixed or adjustable, and said inclined tracks are arranged in water bath. The wrought ball treated thermally with the method and apparatus has uniform hardness and high impact toughness, undamaged rate of falling ball test and antiwear performance.
Description
The present invention relates to the heat treating method and the isolated plant thereof of ferrous alloy, or rather, relate to the heat treating method of the middle and high carbon and low-alloy steel ball of a kind of forging and be used for the built on stilts rollaway type quenching device of this method quenching step.
Abrading-ball is an indispensable grinding media in the ball mill.In plant-scale ball mill, generally all be to use the abrading-ball of ferrous alloy.And the ferrous alloy abrading-ball can be divided into cast-iron grinding ball and forged steel ball two big classes.
There is the even defectives of tissue odds such as often producing shrinkage cavity, loose, pore, slag inclusion in cast-iron grinding ball, and abrasion deformation is big during use, and the percentage of damage height uses shortcomings such as unit consumption height.
Forged steel ball is because of its homogeneous microstructure, and phenomenons such as no shrinkage cavity, loose, pore, slag inclusion are subjected to user's welcome.If but working method, particularly heat treating method are improper, also exist hardness low, not wear-resisting or inhomogeneously become fragile, crack or break etc. owing to quenching.
No matter cast ball or forge ball, not wear-resisting if without special art breading, all there is following shortcoming: (1) grinding unit consumption height, cost height; (2) the abrading-ball loss is fast, has increased the number of times that opens a position, and has prolonged stop time, has reduced production efficiency; (3) increase traffic capacity, the consumption that has increased the labor force and the energy; (4) in coloured ore deposit and during the nonmetalliferous ore ore grinding, the iron powder that enters in the breeze increases, and quality product is descended; (5) add under the processing condition of acid at needs, iron powder is many will to increase the sulfuric acid consumption, and in general, many mills advance one ton of iron powder just needs the sulfuric acid that consume about 3 tons more, has not only increased cost, has also increased the iron level in the leach liquor, brings difficulty for the later separation operation.
Therefore, the steel ball that how production wear resistance is good has become people's common hope.As the material of forged steel ball, normal plain carbon stool stub bar and the steel cuttings etc. of adopting of past developed into materials such as using medium carbon steel, high carbon steel, high-carbon low-alloy steel afterwards.The forging ball of especially middle and high carbon low alloy steel is because hardness height, wear resistance are good, shock-resistant, and cost also the steel alloy than general is low, therefore be subjected to users' welcome.But,, still be difficult to make abrading-ball to bring into play its above-mentioned advantage if there is not the proper heat treatment method to match.Particularly for middle and high carbon low alloyed steel forged ball, quenching conditions difficulty reaches evenly, and is especially all the more so under the situation that has process wastes such as scale oxide, mud at the bottom of the quenching tank.When the quenching conditions of steel ball circumferential surface is inhomogeneous, be easy to crack even whole steel ball bursts owing to stress, the surface that perhaps causes the finished product steel ball is in the hardness heterogeneity of all directions up and down, thereby make that in use gross distortion has influenced the ball milling effect to steel ball widely because wearing and tearing are inhomogeneous.Though Chinese patent application discloses a kind of steel ball heat treatment process No. 92108118.9, this application does not propose to solve the steel ball uneven method of quenching, and does not more mention and uses the built on stilts rollaway type quenching device that resembles among the present invention to quench.
The present invention seeks to provide a kind of shortcoming that overcomes above-mentioned prior art, can make middle and high carbon low alloyed steel forged ball thermal treatment finished product qualification rate near 100% heat treating method and for implementing the custom-designed built on stilts rollaway type quenching device of this method.
The inventor uses middle and high carbon low alloy steel to do the raw material manufacturing and forges ball, carried out the heat treated all research of steel ball, found that, utilize a kind of built on stilts rollaway type quenching device that steel ball is carried out rolling quenching by inventor's design, can avoid steel ball to crack or burst, and make finished product steel ball surface hardness even, thereby the thermal treatment finished product qualification rate that makes steel ball near or reach 100% basically, reduced cost widely.Because this achievement in research, thereby finished the present invention.
Thereby, the invention provides following middle and high carbon low alloyed steel forged ball heat treating method and for implementing the isolated plant of this method:
1, a kind of middle and high carbon low alloyed steel forged ball heat treating method, comprise that the steel ball that forging is good quenches and tempering in oily medium in water medium, it is characterized in that quenching in the wherein said water medium is to carry out rolling quenching in a kind of quenching device with the built on stilts raceway of constant cant angle or adjustable pitch angle.
2, aforesaid forging ball heat treating method, wherein the chemical ingredients of said middle and high carbon low alloy steel is as follows:
Percentage composition (weight %)
C???????????????0.4-1.2
Si??????????????0.5-1.2
Mn??????????????0.7-2.2
S???????????????＜0.05
P???????????????＜0.05
Cr??????????????≤0.4
V???????????????≤0.15
Ti??????????????≤0.15
Mo??????????????≤0.2
Cu??????????????≤0.4
The Fe surplus
3, aforesaid forging ball heat treating method, the temperature of entry was 700-820 ℃ when wherein said steel ball quenched.
4, aforesaid forging ball heat treating method, the temperature of used water-bath is 40-80 ℃ during wherein said the quenching.
5, aforesaid forging ball heat treating method, the surface temperature during the steel ball water outlet of wherein said quenching back is 100-200 ℃.
The temperature of used oil bath is 200-230 ℃ when 6, aforesaid forging ball heat treating method, wherein said tempering, and the medium of oil bath is a machine oil, and tempering time is 3-5 hour.
7, a kind of built on stilts rollaway type quenching device is characterized in that, is provided with the built on stilts raceway of metal at one or more constant cant angle or adjustable pitch angle in the quenching tank.
8, aforesaid built on stilts rollaway type quenching device, the inclination angle of the built on stilts raceway of wherein said constant cant angle metal is 2-15 °.
9, aforesaid built on stilts rollaway type quenching device, the both sides of the built on stilts raceway of wherein said metal are provided with and are used to prevent that steel ball from skidding off the flange of raceway.
10, aforesaid built on stilts rollaway type quenching device, wherein the length of said built on stilts raceway is 2-6 rice.
In the above-mentioned feature of 1-6 item about method, the 1st technical characterictic is an essential features, and the 2-6 item is all the technical characterictic of additional or further qualification.In the feature of above-mentioned 7-10 item about device, the 7th technical characterictic is an essential features, and the 8-10 item is all the technical characterictic of additional or further qualification.
At length explain the present invention below.The inventor found that through long term studies the kinestate of steel ball has a significant impact the effect of quenching when quenching.If steel ball is directly fallen into water-bed motionless, then can influence the heat radiation of steel ball bottom contact surface because of foreign material such as the mud at the bottom, oxide skins, cause the speed of cooling on upper and lower surface inconsistent, the quenching hardness non-uniform phenomenon occurs, use built on stilts rollaway type quenching device of the present invention then can overcome the uneven phenomenon of this quenching hardness.
Built on stilts raceway in the built on stilts rollaway type quenching device of the present invention can be a constant cant angle, also can be adjustable pitch angle, and when built on stilts raceway is under the situation of constant cant angle, its angle of inclination is preferably 2-15 °.But preferably the pitch angle is made adjustable so that regulate the angle of inclination as required.For example, in order to make this built on stilts raceway, materials such as available light rail, band steel, round steel are welded into the fence with 20-60mm spacing, and this fence must have enough rigidity, and not meeting is curved down when rolling in the above with convenient steel ball.Such fence is installed in the degree of depth of 20-30cm under the tank liquid level, the angle of inclination is adjusted in 2-15 ° the scope.Like this, just having formed one between per two root bars of fence can be for the raceway of steel ball rolling.Preferred quenching conditions according to the inventor sets when waiting that the steel ball surface temperature of forging is pre-chilled to 700-820 ℃, drops into rapidly in the quenching device of the present invention, steel ball is rolled in 40-80 ℃ water on built on stilts raceway cool off, and reaches the quenching purpose.The cool time of steel ball, just the residence time of steel ball in water is relevant with the diameter of steel ball, and the diameter of steel ball is big more, and its cool time is long more.Surface temperature during preferably with the hardened steel ball water outlet is 100-200 ℃ and grasps, because the temperature of steel ball heart portion is generally than the high 30-60 of its surface temperature ℃, in the time of so just making steel ball in entering the tempering oil bath, the temperature of the temperature of steel ball and tempering oil bath is close.The length of steel ball residence time in water can be regulated by the length (tank length) of regulating raceway angle of inclination or adjusting raceway during as for quenching.When the length of raceway fixedly the time, can regulate the pitch angle of raceway.For example, when handling the bigger steel ball of diameter, the angle of inclination can be turned down, so that prolong its cool time.Test according to the inventor, if need not make somebody a mere figurehead raceway but directly the steel ball of diameter 100mm is fallen into water-bed quenching method, the upper and lower surface difference of hardness of single ball is up to 10-20 ° of HRC, and bursts easily, in the use also easily because of inhomogeneous distortion of wearing and tearing.In machinery manufacturing industry, in order to prevent this non-uniform phenomenon, generally be to clamp workpiece with anchor clamps, anchor clamps are swung in water, with the elimination non-uniform phenomenon, but such effect is good inadequately, particularly for steel ball, uses anchor clamps to have inconvenience.So the inventor has found out the method for workpiece (steel ball) natural rolling quenching in water of allowing, and this workpiece can be cooled off quickly and evenly.The steel ball that adopts apparatus of the present invention to quench, its surface hardness is even, and internal stress is little, and the phenomenon that can crack or burst does not bring convenience to next process.Can be during use because of inhomogeneous distortion of wearing and tearing yet.
Use quenching device of the present invention and according to method of the present invention, can be effectively the steel ball of the middle and high carbon steel material system of any kind of be heat-treated, still.Consider from hardness, toughness, shock-resistance and the cost etc. of steel ball are many-sided, preferably use middle and high carbon and low-alloy steel with above-mentioned the 2nd institute's determinant.In addition, use apparatus and method of the present invention.Also available some underproof track steel (is for example climbed steel PD
3Rail is because of the offscale steel ZQ of inferior brand that is judged to waste material of composition
2, ZQ
-1, ZQ
-2, ZQ
-3Deng) produce the whole hardened artiwear steel ball of superior performance, thus economic benefit and social benefit improved.
Compare with the forging ball heat treating method of prior art, use method of the present invention and isolated plant to carry out steel ball thermal treatment and can reach following beneficial effect: (1) can avoid steel ball to crack or burst owing to quenching conditions is inhomogeneous when quenching; (2) can improve hardness, impelling strength and the wear resistance of finished product steel ball; (3) the finished product steel ball wearing and tearing inequality that can not cause and sex change owing to hardness is inconsistent; (4) reduced the loss of abrading-ball.Prolong work-ing life, reduced use cost.Facts have proved that the unit consumption of the abrading-ball of heat-treating by the inventive method only is equivalent to equal material and by about 1/2 of prior art thermal treatment abrading-ball; (5) reduce the number of times that opens a position of ball mill, thereby reduced stop time, improved the productivity of ball mill; (6) reduced owing to the iron powder that worn steel ball generated, thereby reduced the consumption of follow-up chemical process reaction reagent and simplified chemical process.
Explain the present invention below in conjunction with accompanying drawing, wherein:
Fig. 1 is the schematic front view of the built on stilts rollaway type quenching device of the present invention;
Fig. 2 is the vertical view of Fig. 1.
Each code name is defined as follows in Fig. 1 and Fig. 2:
1, quenching tank; 2, built on stilts raceway; 3, support; 4, steel ball; 5, the water surface.
In the described preferred version of this accompanying drawing, built on stilts raceway 2 is made of band steel. Although the steel ball 4 of seeing in Fig. 1 is complete profiles, but in fact steel ball 4 is to be between two band steels, as shown in the steel ball 4 of Fig. 2, because the distance between the band steel is less than the diameter of steel ball, so steel ball can not fallen under the raceway that is limited by two band steels, can not skid off outside the raceway yet. Two supports 3 have at least one to be adjustable, thereby can optionally regulate inclination angle and the time of staying of steel ball in tank of raceway. When processing the steel ball of different-diameter, can adopt a plurality of tanks with different raceway width, also many raceways with different raceway width can be set in same tank.
Further explain the present invention below by embodiment and comparative example.But the present invention is not subjected to the qualification of these embodiment.
Embodiment 1
Use built on stilts rollaway type quenching device as depicted in figs. 1 and 2, its principal dimension is: tank long (being that raceway is long) 6m; The high 1m of tank, the wide 1m of tank; The pitch angle of built on stilts raceway is 5 °; The distance of the built on stilts raceway vertex and the water surface is 30mm; Built on stilts raceway is upwards standing with the band steel leptoprosopy of 17 10 * 100mm and is lining up a fence, forms the raceways of 16 confession steel ball rolling quenchings altogether; The raceway width that limits between per two band steels is 40mm.
Heat treatment object is the forging steel ball of diameter 100mm.
High-carbon low-alloy steel chemical composition as the steel ball raw material is as follows:
Percentage composition (weight %)
C????????????????????1.1
Si???????????????????0.92
Mn???????????????????1.28
S????????????????????0.04
P????????????????????0.03
V????????????????????0.13
Ti???????????????????0.08
The Fe surplus
Adopt red cutting-out material, second-heating forging balling-up utilizes forging back waste heat to carry out rolling quenching on built on stilts raceway, and all the other various heat-treat conditions are as follows:
Quenching water temperature: 75 ℃
Surface temperature during the steel ball entry: 750 ± 10 ℃
Cool time: 8 minutes
Surface temperature during the steel ball water outlet: 160 ± 10 ℃
After the steel ball water outlet to the timed interval of putting into tempering bath: 10-20 second
Tempering medium: machine oil
Tempering bath temperature: 220 ℃
Tempering insulation time: 200 minutes,
10 steel balls of co-processing see Table 1 to every detected result (mean value) of obtaining product.
Comparative example 1
Except not adopting built on stilts rollaway type quenching device of the present invention but directly steel ball is fallen into bottom of gullet quenches, all the other conditions are all identical with embodiment 1, and 10 steel balls of co-processing see Table 1 to every detected result of obtaining product.
Except the quenching water temperature is changed into 50 ℃, all the other conditions are all identical with embodiment 1,10 steel balls of co-processing, and its detected result (mean value) sees Table 1.
Comparative example 2
Except not adopting built on stilts rollaway type quenching device of the present invention but directly steel ball is fallen into bottom of gullet quenches, all the other conditions are all identical with embodiment 2,10 steel balls of co-processing, and its detected result (mean value) sees Table 1.
The detected result of table 1 pair steel ball
| Embodiment 1 | | Comparative example 1 | Comparative example 2 | ||
| Surface hardness HRC | Upper surface | ????56.5 | ?58.9 | ??55 | ????58 |
| Lower surface | ????56.5 | ?58.9 | ??46 | ????38.5 | |
| Centre hardness HRC | ????50.5 | ?51 | ??36 | ????37 | |
| Impelling strength J/cm 2 | ????14.2 | ?14.1 | ??-* | ????-* | |
| Fall sphere test (3.5 meters height, 50000 statistics) | 100% is intact | 100% is intact | 11% breakage | 13.5% breakage | |
| Detect mutually entirely | Martensite and bainite are main, and crystal grain is fine and closely woven | With a left side | ??-* | ????-* | |
* because of upper and lower two surface sampling difference in hardness are too big, there is no need to do this test.
As can be seen from Table 1, the surface hardness of the steel ball that obtains surperficial in full accord upper and lower two sides in the embodiment of the invention 1 and embodiment 2, and also when 6 of its up, down, left, right, before and afters were measured, the surface hardness of each point was all consistent.And it is very big as the difference in hardness on the upper and lower surface of steel ball of obtaining in the comparative example 1 of prior art and the comparative example 2.In addition, in 50000 fall sphere tests of 3.5 meters height, none breakage of steel ball of the embodiment of the invention 1 and embodiment 2, serviceability rate reaches 100%.And the steel ball of comparative example 1 has 11% breakage, and the steel ball of comparative example 2 has 13.5% breakage.If consider the abrasion deformation or the breakage that cause owing to surface hardness is inconsistent, then comparative example 1 and 2 steel ball in use since distortion or the damaged halfway that causes scrap also will be much larger than above-mentioned damaged percentage ratio.This shows, according to the inventive method with to use apparatus of the present invention to heat-treat the quality of steel ball of processing more much better than the steel ball of heat-treating processing by prior art.
Claims (10)
1, a kind of middle and high carbon low alloyed steel forged ball heat treating method, comprise that the steel ball that forging is good quenches and tempering in oily medium in water medium, it is characterized in that quenching in the wherein said water medium is to carry out rolling quenching in a kind of quenching device with the built on stilts raceway of constant cant angle or adjustable pitch angle.
2, forging ball heat treating method as claimed in claim 1 is characterized in that wherein the chemical ingredients of said middle and high carbon low alloy steel is as follows:
Percentage composition (weight %)
C????????????????0.4-1.2
Si???????????????0.5-1.2
Mn???????????????0.7-2.2
S????????????????＜0.05
P????????????????＜0.05
Cr???????????????≤0.4
V????????????????≤0.15
Ti???????????????≤0.15
Mo???????????????≤0.2
Cu???????????????≤0.4
The Fe surplus
3, forging ball heat treating method as claimed in claim 1 or 2 is characterized in that, the temperature of entry was 700-820 ℃ when wherein said steel ball quenched.
4, forging ball heat treating method as claimed in claim 1 or 2 is characterized in that, the temperature of used water-bath is 40-80 ℃ during wherein said the quenching.
5, forging ball heat treating method as claimed in claim 1 or 2 is characterized in that, the surface temperature during the steel ball water outlet of wherein said quenching back is 100-200 ℃.
6, forging ball heat treating method as claimed in claim 1 or 2 is characterized in that, the temperature of used oil bath is 200-230 ℃ during wherein said tempering, and the medium of oil bath is a machine oil, and tempering time is 3-5 hour.
7, a kind of built on stilts rollaway type quenching device is characterized in that, is provided with the built on stilts raceway of metal at one or more constant cant angle or adjustable pitch angle in the quenching tank.
8, built on stilts rollaway type quenching device as claimed in claim 7 is characterized in that, the inclination angle of the built on stilts raceway of wherein said constant cant angle metal is 2-15 °.
As claim 7 or 8 described built on stilts rollaway type quenching devices, it is characterized in that 9, the both sides of the built on stilts raceway of wherein said metal are provided with and are used to prevent that steel ball from skidding off the flange of raceway.
10, as claim 7 or 8 described built on stilts rollaway type quenching devices, it is characterized in that wherein the length of said built on stilts raceway is 2-6 rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100608A CN1046766C (en) | 1997-03-06 | 1997-03-06 | Heat treatment process of medium-high carbon low alloyed steel forged ball and overhead rollaway type quenching appts. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100608A CN1046766C (en) | 1997-03-06 | 1997-03-06 | Heat treatment process of medium-high carbon low alloyed steel forged ball and overhead rollaway type quenching appts. |
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| Publication Number | Publication Date |
|---|---|
| CN1165865A true CN1165865A (en) | 1997-11-26 |
| CN1046766C CN1046766C (en) | 1999-11-24 |
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ID=5165178
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97100608A Expired - Fee Related CN1046766C (en) | 1997-03-06 | 1997-03-06 | Heat treatment process of medium-high carbon low alloyed steel forged ball and overhead rollaway type quenching appts. |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912107A (en) * | 2012-09-14 | 2013-02-06 | 合肥市远大轴承锻造有限公司 | Lifting basket mechanism for bearing forging controlled-cooling device |
| CN103436671A (en) * | 2013-08-05 | 2013-12-11 | 河北科技大学 | Special equipment for two-medium quenching heat treatment and cooling and technology of equipment |
| CN104232872A (en) * | 2014-09-19 | 2014-12-24 | 常熟市非凡金属制品有限公司 | Steel ball quenching device with intermediate frequency furnace cooling function |
| CN104561502A (en) * | 2015-01-08 | 2015-04-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of high-hardenability steel ball |
| CN106435151A (en) * | 2016-10-13 | 2017-02-22 | 山东伊莱特重工股份有限公司 | Alternate barrel type heat treating machine |
| CN108504844A (en) * | 2017-11-01 | 2018-09-07 | 新昌县七星街道炜德机械厂 | A kind of lasso processing quenching unit |
| CN109082519A (en) * | 2018-09-19 | 2018-12-25 | 铜陵市明诚铸造有限责任公司 | A kind of staged heat-exchanger rig for abrasion-proof steel ball Q-tempering |
| CN110106438A (en) * | 2019-04-23 | 2019-08-09 | 河北工业大学 | The high soft core of volume hardness rolls abrading-ball steel, production method and grinding ball production method |
| CN111876659A (en) * | 2020-04-29 | 2020-11-03 | 椿中岛机械(太仓)有限公司 | High corrosion resistance steel ball for automobile water pump bearing |
| CN114085981A (en) * | 2021-11-05 | 2022-02-25 | 黄磊 | Stainless steel ball heat treatment equipment based on gravity conveying |
| CN114892086A (en) * | 2022-05-07 | 2022-08-12 | 安徽新马铸造科技有限公司 | Corrosion-resistant high-strength wear-resistant steel ball |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1062283A1 (en) * | 1982-01-08 | 1983-12-23 | Институт черной металлургии | Unit for hardening milling balls |
| SU1344793A1 (en) * | 1986-03-07 | 1987-10-15 | Ждановский металлургический институт | Method of heat treatment of milling balls |
-
1997
- 1997-03-06 CN CN97100608A patent/CN1046766C/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912107A (en) * | 2012-09-14 | 2013-02-06 | 合肥市远大轴承锻造有限公司 | Lifting basket mechanism for bearing forging controlled-cooling device |
| CN103436671A (en) * | 2013-08-05 | 2013-12-11 | 河北科技大学 | Special equipment for two-medium quenching heat treatment and cooling and technology of equipment |
| CN103436671B (en) * | 2013-08-05 | 2015-07-01 | 河北科技大学 | Special equipment for two-medium quenching heat treatment and cooling and technology of equipment |
| CN104232872A (en) * | 2014-09-19 | 2014-12-24 | 常熟市非凡金属制品有限公司 | Steel ball quenching device with intermediate frequency furnace cooling function |
| CN104561502A (en) * | 2015-01-08 | 2015-04-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of high-hardenability steel ball |
| CN106435151A (en) * | 2016-10-13 | 2017-02-22 | 山东伊莱特重工股份有限公司 | Alternate barrel type heat treating machine |
| CN108504844A (en) * | 2017-11-01 | 2018-09-07 | 新昌县七星街道炜德机械厂 | A kind of lasso processing quenching unit |
| CN109082519A (en) * | 2018-09-19 | 2018-12-25 | 铜陵市明诚铸造有限责任公司 | A kind of staged heat-exchanger rig for abrasion-proof steel ball Q-tempering |
| CN109082519B (en) * | 2018-09-19 | 2019-12-06 | 铜陵市明诚铸造有限责任公司 | stepped heat exchange device for quenching and tempering of wear-resistant steel balls |
| CN110106438A (en) * | 2019-04-23 | 2019-08-09 | 河北工业大学 | The high soft core of volume hardness rolls abrading-ball steel, production method and grinding ball production method |
| CN111876659A (en) * | 2020-04-29 | 2020-11-03 | 椿中岛机械(太仓)有限公司 | High corrosion resistance steel ball for automobile water pump bearing |
| CN114085981A (en) * | 2021-11-05 | 2022-02-25 | 黄磊 | Stainless steel ball heat treatment equipment based on gravity conveying |
| CN114085981B (en) * | 2021-11-05 | 2023-09-29 | 郭金福 | Stainless steel ball heat treatment equipment based on gravity conveying |
| CN114892086A (en) * | 2022-05-07 | 2022-08-12 | 安徽新马铸造科技有限公司 | Corrosion-resistant high-strength wear-resistant steel ball |
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| Publication number | Publication date |
|---|---|
| CN1046766C (en) | 1999-11-24 |
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