CN107604264A - Cooling water pipe of engine and its preparation technology - Google Patents
Cooling water pipe of engine and its preparation technology Download PDFInfo
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- CN107604264A CN107604264A CN201710788218.1A CN201710788218A CN107604264A CN 107604264 A CN107604264 A CN 107604264A CN 201710788218 A CN201710788218 A CN 201710788218A CN 107604264 A CN107604264 A CN 107604264A
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Abstract
The invention discloses cooling water pipe of engine and its preparation technology, belong to powder metallurgical technology.Cooling water pipe of engine material composition and percentage composition are：Be：0.2 2%, Zr：0.3 0.6%, C：0.01 0.1%, Si：0.4 0.8%, Cr：0.5 1%, Ni：2 4%, surplus is Fe and impurity.Be and Zr in raw material can not only greatly reduce the content of impurity element P, S, O, N in product, steel is had higher temperature strength, croop property and low-temperature flexibility.Meanwhile Ni is evenly distributed on the shallow-layer of steel with reference to cladding powder craft, uniform microscopic structure is readily available during sintering, is advantageous to the raising of product decay resistance.
Description
Technical field
The present invention relates to cooling water pipe of engine, and in particular to powder metallurgy cooling water pipe of engine and its preparation technology,
Belong to powder metallurgical technology.
Background technology
Powder metallurgy is to produce metal dust or made with metal dust (or mixture of metal dust and non-metal powder)
For raw material, by shaping and sintering, the technology of manufacture metal material, composite and all kinds product.Powder smelting
Gold includes powder processed and product.Powder wherein processed is mainly metallurgical process, and literal identical.And sintered metal product then often far beyond
Material and metallurgical category, often across the technology of multidisciplinary (material and metallurgy, machinery and mechanics etc.).Especially contemporary metal powder
Last 3D printing, collection mechanical engineering, CAD, reverse Engineering Technology, Layered Manufacturing Technology, Numeric Control Technology, material science, laser technology
So that sintered metal product technology turns into across more multi-disciplinary modern complex art.
Powder metallurgy low-alloy steel refer to powder metallurgy process prepare (iron content is typically in 90%- based on iron
98%) alloy system for, adding the elements such as a certain amount of copper, nickel, molybdenum, chromium, manganese and controlling carbon content and forming.Powder metallurgy is low
Steel alloy has high intensity, high rigidity and certain ductility, particularly suitable for making structural material, therefore is widely used in national defence
In industry and civilian industry, especially occupy critical role in automobile, motorcycle, firearms and household electric appliances.It is appeared in earliest
In the 1930s, start the 1950s to be widely used.
And traditional cooling water pipe of engine generally use pressure processing, processed steel (base, ingot etc.) is produced plasticity
Deformation, is then divided to two kinds of cold working and hot-working according to steel processing temperature difference.The main machining method of steel has：Rolling,
Casting, drawing group, extruding etc..Not only process is various for traditional diamond-making technique, and product performance such as intensity, hardness etc. also
Shortcoming.
It is low for conventional alloys steel hardness, it is not wear-resisting the shortcomings of, publication number 106244936A discloses one kind and passes through raising
Carbon in alloying pellet, chromium, the content of molybdenum improve the intensity of product, hardness and wearability.It is however, some in simple raising alloy
The content of element not can solve the tensile strength of steel alloy, yield strength, corrosion resistance and reduce impurity in steel
Element.
The content of the invention
For above-mentioned problem, the present invention is provided in high-tensile, high-yield strength, corrosion-resistant and reduction steel
The cooling water pipe of engine of impurity element.
To achieve these goals, the present invention uses following technical scheme：
Cooling water pipe of engine, described cooling water pipe of engine are made up of following composition and its mass percent：Be：
0.2-2%, Zr：0.3-0.6%, C：0.01-0.1%, Si：0.4-0.8%, Cr：0.5-1%, Ni：2-4%, surplus be Fe and
Impurity.
In existing steel alloy raw material proportioning, usually using manganese as deoxidier and desulfurizing agent, although manganese has resource
Abundant, the characteristics of efficiency is various, but manganese can increase the tendency and temper brittleness sensitiveness of crystalline grain of steel roughening, smelt cast and
It is improper to forge roller repairing, steel is produced white point.Beryllium is added in the raw material of steel alloy of the present invention, beryllium and oxygen, sulphur have pole
Strong affinity, deoxygenation, the ability of sulphur removal are better than manganese, while steel can be made to have higher temperature strength and croop property.
It is except deoxidation, nitrogen, sulphur, the cleanser of phosphorus, in low-alloy knot meanwhile the zirconium in raw material is strong deoxidation and denitrogenation element
Improve the low-temperature flexibility of steel in structure steel, effect is much better than the vanadium in conventional alloys steel.Nickel as a kind of excellent corrosion resistant metal,
The present invention combines the coated composite powder program in preparation technology, nickel is more equally distributed in product superficial face, substantially increases production
The decay resistance of product.
Preferably, in cooling water pipe of engine composition, Ni is the NiCl weighed in proportion2·6H2O.The present invention uses
Powder craft is coated, is reacted using displacements of the Fe to Ni so that Ni may be uniformly distributed in Fe powder surface, be advantageous to sinter.
Preferably, in cooling water pipe of engine composition, each content is P ＜ 0.04%, S ＜ 0.05%, N ＜ in impurity
0.01%th, O ＜ 0.01%.In traditional raw material proportioning manganese can not the fine content that must reduce these impurity, and the present invention is logical
Cross and add the stronger beryllium and zirconium of affinity so that impurity content lifts the performance of steel well below requiring.
The present invention additionally provides another technical solution while reasonable selection material mixture ratio：
The preparation technology of cooling water pipe of engine, described method comprise the following steps：
(1) powder processed：Raw material is weighed by the composition and its mass percent of cooling water pipe of engine in claim 1 or 2, will
Except NiCl2·6H2Various raw materials outside O are milled into powder through air-flow respectively；
(2) coated composite powder：Toward NiCl2·6H2O adds H in a reservoir3BO3Be mixed into solution with distilled water, by iron powder plus
Enter the iron powder that cladding Ni is made in reaction；
(3) shape：Powder made from above-mentioned steps (1) and (2) is put into punching block, is pressed into tubular blank；
(4) sinter：Tubular blank is first subjected to pre-sintering at 600-800 DEG C, then in 1100-1300 after the processing of multiple pressure
Sintered at DEG C and water pipe semi-finished product are made；
(5) it is surface-treated：Water pipe finished product is placed in water vapor atmosphere, 1-2h is kept at 500-600 DEG C, is made and starts
Machine cooling water pipe finished product.
Powder metallurgical technique substitutes the steel work flows such as traditional rolling, casting, drawing group, extruding, not only reduces processing
Process, and product one-shot forming can be avoided increasing scrappage because of follow-up dimensioned, while also cause product anti-
Tensile strength, yield strength, corrosion resistance obtain greatly lifting.The coated composite powder of nickel coated iron is used in the preparation technology of the present invention
Processing mode so that nickel can be evenly distributed on the surface of iron, and diffusion of alloy elements is readily available uniform apart from short, during sintering
Microscopic structure, be advantageous to the raising of properties of product.Meanwhile the volume used during shaping excessively adds powder, the triple pressurizations of floating die, drawing
The combination of bottom knockout makes the density of pressed compact evenly, improves sintering quality.Wherein, multiple pressure technique when pre-sintered can be entered
One step limits product specification, improves product density.
The cooling water pipe of engine of the present invention uses powder metallurgical technique, and preparation method is ripe, while in preparation technology
Improve to some extent, enhance product performance.Meanwhile the surface treatment of product can increase product density, rust-proofing ability is improved.
Preferably, in step (1), described powder processed is that will remove NiCl2·6H2Various raw materials outside O are respectively through air-flow
It is milled into powder of the particle diameter at 3-5 μm.Control particle diameter can be sufficiently mixed raw material, reduce interiors of products space.
Preferably, in step (2), the coated composite powder is specially：By NiCl6H2O and H3BO3By 10:1 mixing, adds
Enter distilled water until being completely dissolved, then iron powder is slowly added into solution and stirred, while it is anti-to induce displacement to add hydrochloric acid
Should, nickel will form clad on iron powder surface.Solution ph is controlled between 3.5-4.5, and temperature is maintained between 70-80 DEG C.
After reaction is covered to complete, solution is poured out into filtering, and obtained powder is dried, is reduced under 400-500 DEG C of hydrogen atmosphere
15min.Coated using chemical method, the nickel on iron powder surface can be made more uniformly to be distributed, diffusion of alloy elements in coated composite powder
Uniform microscopic structure is readily available apart from short, during sintering, is advantageous to the raising of properties of product.
Preferably, in step (3), the shaping excessively adds the triple pressurizations of powder, floating die, the demoulding of leaving behind using volume
Combination operated.The density for making pressed compact evenly, improves sintering quality.
Preferably, in step (4), the sintering is specially：By the tubular blank first pre-sintering at 700-800 DEG C
40-50min, while repressing operation is carried out to blank, finally sinter 2-3h at 1200-1300 DEG C.Pressure technique can enter one again
Step limits product specification, improves product density.
Compared with prior art, the invention has the advantages that：
(1) beryllium is added in raw material, beryllium and oxygen, sulphur have extremely strong affinity, and deoxygenation, the ability of sulphur removal are better than manganese, together
When can make steel that there is higher temperature strength and croop property.
(2) zirconium in raw material is strong deoxidation and denitrogenation element, is except deoxidation, nitrogen, sulphur, the cleanser of phosphorus, low
Improve the low-temperature flexibility of steel in structural alloy steel, effect is much better than the vanadium in conventional alloys steel.
(3) preparation method enables nickel to be evenly distributed on iron powder surface, alloying element expands in coated composite powder using cladding powder craft
Dissipate apart from short, be readily available uniform microscopic structure during sintering, be advantageous to the raising of product decay resistance.
(4) during pre-sintered, the multiple pressure technique of use can further limit product specification, improve product density.
(5) volume is excessively plus the triple pressurizations of powder, floating die, the combination for the demoulding of leaving behind make the density of pressed compact evenly,
Improve sintering quality.
(6) ferroso-ferric oxide diaphragm can be formed in product surface using vapor surface treatment, increases product density,
Also possesses certain antirust ability simultaneously.
Embodiment
It is the specific embodiment of the present invention below, technical scheme is further described, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1
Powder processed：Raw material is weighed by cooling water pipe of engine composition and its mass percent in claim 1 or 2, containing Be：
2%th, Zr：0.6%th, C：0.05%th, Si：0.5%th, Cr：0.7%th, Ni：4%th, surplus is Fe and impurity, and wherein Ni claims in proportion
Take NiCl2·6H2O.NiCl will be removed2·6H2Various raw materials outside O are milled into the powder that particle diameter is 3 μm through air-flow respectively.
Coated composite powder：By NiCl6H2O and H3BO3By 10:1 mixing, distilled water is added until being completely dissolved, then by iron powder
It is slowly added into solution and stirs, while add hydrochloric acid to induce displacement reaction, nickel will forms clad on iron powder surface.Control
Solution ph is 4, and temperature is maintained at 75 DEG C.After reaction is covered to complete, solution is poured out into filtering, and obtained powder is done
It is dry, reduce 15min under 450 DEG C of hydrogen atmospheres.
Shaping：Powder obtained above is put into punching block, the triple pressurizations of powder, floating die are excessively added using volume, are left behind
Powder is pressed into tubular blank by the combination of the demoulding.
Sintering：By tubular blank first 45min pre-sintered at 750 DEG C, while repressing operation is carried out to blank, further advise
Whole product specification, room temperature is cooled to after finally sintering 2.5h at 1250 DEG C.
Surface treatment：Product after the completion of sintering is placed in water vapor atmosphere, 2h is kept at 550 DEG C, is made and starts
Machine cooling water pipe finished product.
Embodiment 2-3
With differing only in for embodiment 1, embodiment 2-3 raw material particle sizes are respectively 4 μm, 5 μm.
Embodiment 4-7
With differing only in for embodiment 1, in embodiment 4-7 raw materials Be content be respectively 0.2%, 0.5%, 1%,
1.5%.
Embodiment 8-9
With differing only in for embodiment 1, Zr content is respectively 0.3%, 0.5% in embodiment 8-9 raw materials.
Embodiment 10-11
With differing only in for embodiment 1, the pH value that embodiment 8-9 is coated in powder craft is respectively 3.5,4.5.
Embodiment 12-13
With differing only in for embodiment 1, the temperature that embodiment 12-13 is coated in powder craft is respectively 70 DEG C, 80 DEG C.
Embodiment 14-15
With differing only in for embodiment 1, embodiment 14-15 pre-sintering temperatures are respectively 700 DEG C, 800 DEG C, time difference
For 40min, 50min, sintering temperature is respectively 1200 DEG C, 1300 DEG C, and the time is respectively 2h, 3h.
Comparative example 1
With differing only in for embodiment 1, Be is free of in the raw material of comparative example 1.
Comparative example 2
With differing only in for embodiment 1, Zr is free of in the raw material of comparative example 2.
Comparative example 3
With differing only in for embodiment 1, Be and Zr is free of in the raw material of comparative example 3.
Comparative example 4
With differing only in for embodiment 1, comparative example 4 is without coated composite powder technological operation.
Its tensile strength, yield strength, corrosion resistant are tested by the cooling water pipe of engine of above material mixture ratio and technique productions
Corrosion and impurity content are as shown in table 1：
Table 1：The performance of product in embodiment 1-15
Table 2：The performance of comparative example 1-4 products
As can be seen from the data in the table, by adding Be and Zr, the impurity element in steel alloy water pipe is greatly reduced, is dropped
Low product fragility, drastically increase the tensile strength and yield strength of product.Meanwhile using coated composite powder technology, improve production
The decay resistance of product, add the service life of product.
It is skilled to this area although having been made a detailed description to the present invention and being cited some specific embodiments
For technical staff, as long as it is obvious that can make various changes or correct without departing from the spirit and scope of the present invention.
Claims (8)
1. cooling water pipe of engine, it is characterised in that described cooling water pipe of engine is by following composition and its mass percent
Composition：Be：0.2-2%, Zr：0.3-0.6%, C：0.01-0.1%, Si：0.4-0.8%, Cr：0.5-1%, Ni：It is 2-4%, remaining
Measure as Fe and impurity.
2. cooling water pipe of engine according to claim 1, it is characterised in that the Ni is the NiCl weighed in proportion2·
6H2O。
3. cooling water pipe of engine according to claim 1, it is characterised in that the impurity includes P ＜ 0.04%, S ＜
0.05%th, N ＜ 0.01%, O ＜ 0.01%.
4. the preparation technology of cooling water pipe of engine, it is characterised in that described method comprises the following steps：
(1) powder processed：Raw material is weighed by cooling water pipe of engine composition and its mass percent in claim 1 or 2, will be removed
NiCl2·6H2Various raw materials outside O are milled into powder through air-flow respectively；
(2) coated composite powder：Toward NiCl2·6H2O adds H in a reservoir3BO3Solution is mixed into distilled water, adds iron powder reaction system
Ni iron powder must be coated；
(3) shape：Powder made from above-mentioned steps (1) and (2) is put into punching block, is pressed into tubular blank；
(4) sinter：Tubular blank is first subjected to pre-sintering at 600-800 DEG C, then after the processing of multiple pressure at 1100-1300 DEG C
Water pipe semi-finished product are made in sintering；
(5) it is surface-treated：Water pipe finished product is placed in water vapor atmosphere, 1-2h is kept at 500-600 DEG C, it is cold that engine is made
But water pipe finished product.
5. the preparation technology of cooling water pipe of engine according to claim 4, it is characterised in that powder described in step (1)
The particle diameter at end is 3-5 μm.
6. the preparation technology of cooling water pipe of engine according to claim 3, it is characterised in that NiCl in step (2)
6H2O and H3BO3By 10:1 mixing, adds distilled water until being completely dissolved, controls the pH of solution in 3.5-4.5, temperature 70-80
DEG C, finally reduced in hydrogen atmosphere.
7. the preparation technology of cooling water pipe of engine according to claim 4, it is characterised in that the shaping uses volume
The triple pressurizations of excessive plus powder, floating die, the combination for the demoulding of leaving behind are operated.
8. the preparation technology of cooling water pipe of engine according to claim 4, it is characterised in that pre-sintered temperature is
700-800 DEG C, time 40-50min, while including the multiple repoussage shape to blank；The temperature of sintering is 1200-1300 DEG C, when
Between be 2-3h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710788218.1A CN107604264B (en) | 2017-09-05 | 2017-09-05 | Engine cooling water pipe and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710788218.1A CN107604264B (en) | 2017-09-05 | 2017-09-05 | Engine cooling water pipe and preparation process thereof |
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| CN106048440A (en) * | 2015-05-05 | 2016-10-26 | 南通莱必特轴承有限公司 | Bearing material |
| CN106244936A (en) * | 2016-08-30 | 2016-12-21 | 马鞍山市中马金属材料有限公司 | Alloy steel ball |
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-
2017
- 2017-09-05 CN CN201710788218.1A patent/CN107604264B/en active Active
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| CN1772382A (en) * | 2005-04-07 | 2006-05-17 | 上海亚兰德新能源材料有限公司 | Metal carrier for automobile tail gas purifier catalyst and its prepn |
| CN102041454A (en) * | 2009-10-21 | 2011-05-04 | 宝山钢铁股份有限公司 | High hardness steel for forging and forming cold roller |
| CN106048440A (en) * | 2015-05-05 | 2016-10-26 | 南通莱必特轴承有限公司 | Bearing material |
| CN106244936A (en) * | 2016-08-30 | 2016-12-21 | 马鞍山市中马金属材料有限公司 | Alloy steel ball |
| CN106566988A (en) * | 2016-10-18 | 2017-04-19 | 滁州市大工机电有限公司 | Alloy steel material for anti-corrosion pump valve and preparation method thereof |
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