CN1013052B - The connecting means of tube-to-tube sheet connection - Google Patents
The connecting means of tube-to-tube sheet connectionInfo
- Publication number
- CN1013052B CN1013052B CN 87105913 CN87105913A CN1013052B CN 1013052 B CN1013052 B CN 1013052B CN 87105913 CN87105913 CN 87105913 CN 87105913 A CN87105913 A CN 87105913A CN 1013052 B CN1013052 B CN 1013052B
- Authority
- CN
- China
- Prior art keywords
- powder
- tube
- tube sheet
- conical surface
- cutting ferrule
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Powder Metallurgy (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The present invention is the connecting means of tube-to-tube sheet connection in the pressurized container.Adopt cutting ferrule 2 tube sheet 1 to be connected with pipe 4 with swivel nut 3.The conical surface of cutting ferrule 2 contacts with conical surface R between the tube sheet shoulder hole, thread bush 3 is connected with tube sheet 1 by screw thread, when threaded together is overlapped, withstands cutting ferrule 2, the conical surface of cutting ferrule 2 and conical surface R extruding produce the plastic deformation cutting edge and stick into tube wall, play sealing and interconnect function.
The present invention substitutes traditional welding method with cold working, has improved the resistance to corrosion of joint, and is safe and reliable, and saves material, reduces production costs, and improves working conditions.
Description
The present invention relates to reduce the method for tungsten-nickel-ferro-alloy mechanical property value dispersiveness.
Those of ordinary skill in the present technique field is known, is used to make balanced body, and radiation and vibration-absorbing body and the paraholoid with boring ability should have quite high proportion.
Therefore, used so-called " weight " alloy for making these objects, wherein mainly contain the tungsten that is dispersed in the metal matrix, and matrix generally is made of bond element such as nickel and iron, this alloy has seen for example USP3888636, these alloys mainly make with powder metallurgic method, even its each component is the powder attitude, compressed moulding, sintering is also heat-treated and machine treatment where necessary, thereby can get its mechanical property such as rupture strength, limit of elasticity, specific elongation and hardness reach the product of institute's required value.
But, found that these performances have nothing in common with each other between different alloying ingredients, even may depart from desired value far away.
The claimant carries out finding after extensively and profoundly the research to these phenomenons, and this dispersiveness is because of due to two kinds of factors basically:
On the one hand, be tungsten powder characteristic such as its diameter, form and particle size distribution, according to altering a great deal that it is created conditions, in fact, particularly during powders compression, this variation makes product reach different performance density, thereby causes the change of state in the subsequent processes; This makes the gained alloy mechanical performance different again, therefore, in some production cycle process, change treatment conditions according to powder property, although this mode is very effective, adds control and make equipment retrofit in each cyclic process.
On the other hand, this dispersiveness is also because of due to the powder-processed condition.In fact, the those of ordinary skill in the present technique field is known, departs from normal sintering temperature ± 20 ℃ and handles in the stove product and derive several mm/min of velocity variations and can make the mechanical property significant change.In addition, underspeed and to make the corresponding reduction of intensity with hardness.
As for temperature, occur any temperature decline about 20 ℃ and all can produce harmful effect specific elongation.If shown temperature basically this variation can not take place, then for the product that send the burning freezing of a furnace with flank speed, this identical situation can not occur again yet, because this can not make the thermal change on the whole furnace length identical.But, be difficult to control this velocity variations, even can affirm that temperature is always corresponding to identical temperature gradient, because the gaseous environment in the heat insulation capacity of wadding and the stove is along with the time changes in the stove by commercial scale.
In order to overcome these difficulties, apply for talents' tapping and can reduce the method that the W-Ni-Fe alloy mechanical performance dispersiveness of alternating temperature treatment conditions was made and experienced to the various characteristics powder just, wherein need not change the actual treatment condition.
The feature of this method is synchronously cobalt and manganese to be added in the initial powder.
Therefore the present invention will contain 85-99%(weight) tungsten, 1-10%(weight) nickel and 1-10%(weight) powder and the cobalt powder and the manganese powder " doping " that add synchronously of iron get up, this is because be a kind of short crisp dose when cobalt uses separately for this class alloy, can cause the loss of alloy ductility as shown in Figure 1, show rupture strength, limit of elasticity and the ductility of respective alloy among the figure according to the weight % content of cobalt in the powder.
This doping be by hybrid mode when nickel and iron are added tungsten or carrying out thereafter, can adopt the various mixers that present technique field those of ordinary skill is known.Add the close 1-15 of the being μ mFISHER of particle diameter of powder and be preferably 3-6 μ m to reach higher mechanical property with tungsten.Press optimal way, the institute add the powder amount should make contain 0.02-2%(weight in the final powder) cobalt and 0.02-2%(weight) manganese.
Adulterated flour carries out following processing then:
Be pressed into the product of suitable size with equilibrium or single shaft press;
In draft furnace under 1000-1700 ℃ with this product sintering 1-10 hour, also can carry out following processing then according to the end use of product:
Under 700-1300 ℃ partial vacuum condition, sintered products was outgased 2-20 hour;
The degassing product of the about 5-20% of forging and pressing;
Under the partial vacuum condition of 300-1200 ℃ of heating, make the product tempering.
Find to add different qualities and the treatment conditions that cobalt and manganese almost can eliminate because of powder and changed the effect that causes, can improve gained hardness of alloy and ductility again simultaneously.Simultaneously, also can enlarge the operating range that temperature and product in the stove derive speed.
The present invention now describes in detail with following embodiment, and its result has been shown in accompanying drawing 2,3, in 4 and 5.
The tungsten powder batch of 4 kinds of separate sources is denoted as 1,2, and 3 and 4, wherein all contain 4.5% nickel and 2.5% iron, each is divided into two parts.One of them is by the present invention and 1%(weight) cobalt and 1%(weight) manganese mixes, and two-part all carry out operation and the processing under aforementioned the same terms.
Below measure the limit of elasticity R of product after each step
p, rupture strength R
mWith specific elongation A%; Sintering-degassing-forging and pressing-tempering is denoted as A, B, C and D among Fig. 2 and 3.
Fig. 2 has shown in the prior art the particularly dispersiveness of the 4th kind of measured value of each powder of alloy.
Fig. 3 has shown the grouping phenomenon of alloy measured value of the present invention, and in fact these values of final stage in the alloy manufacture process are consistent.These results show the source that can not consider used tungsten powder.
In addition, doped alloys mechanical property end value corresponds essentially to has the not end value of adulterated flour of better characteristic, promptly
R
p≈1100MP
a，R
m≈1050MP
a，A%≈8
In another group test, adopted bulk ingredients same as described above, separated into two parts, a part is not mixed, and is designated as a, and another part mixes by the present invention, is designated as b.Two-part are divided into 9 parts, are designated as 1-9.Each part all carries out above-mentioned processing, and be though sintering condition is all different, identical with b for the component a of same numeral.
The condition difference of carrying out sintering in the draft furnace is:
Be the temperature in stove district and outlet port on the one hand, be chosen as 3 different values: general sintering temperature (about 1550 ℃); Low temperature (about 1530 ℃) and high temperature (about 1570 ℃).
Be on the other hand in the sintering furnace product by the time speed, be chosen as 3 different values: general speed (17mm/min); Low speed (11mm/min) and high speed (26mm/min).
The temperature and the velocity conditions of each part are listed in the table below.
Component label temperature (℃) speed (mm/min)
1a-1b 11
2a-2b 1550 17
3a-3b 26
4a-4b 11
5a-5b 1530 17
6a-6b 26
7a-7b 11
8a-8b 1570 17
9a-9b 26
The rupture strength Rm(MP of each alloy after the mensuration tempering
a), limit of elasticity R
p0.2(MP
a), Vickers hardness, specific elongation (%).
That indicate among Fig. 4 is the component a that do not mix, the doping component b that indicates among Fig. 5.As can be seen, speed and temperature difference make the product appearance mechanical property dispersiveness clearly of not mixing.On the contrary, for the doping product, can notice the grouping phenomenon of rupture strength and limit of elasticity value, and hardness is almost consistent with specific elongation.And hardness and specific elongation value obviously are improved, and be irrelevant with speed.
Can obviously find out superiority of the present invention from above, except suppressing dispersed, also can improve some performance number, and can not consider speed and temperature problem, this so give the production cycle and production equipment brings greater flexibility, and be expected to improve production capacity, because can accelerate product discharge speed in the stove.
Claims (2)
1, reduces the method for the tungsten-nickel-ferro-alloy mechanical property dispersiveness of under the alternating temperature treatment conditions, handling with the separate sources powder, it is characterized in that in initial powder, adding synchronously cobalt and manganese powder, institute adds the powder amount should be made and contain 0.02-2% (weight) cobalt and 0.02-2% (weight) manganese in the final powder, and add powder the FISHER granularity be 1-15 μ m.
2, by the method for claim 1, it is characterized in that particle diameter is 3-6 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105913 CN1013052B (en) | 1987-10-09 | 1987-10-09 | The connecting means of tube-to-tube sheet connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105913 CN1013052B (en) | 1987-10-09 | 1987-10-09 | The connecting means of tube-to-tube sheet connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1032387A CN1032387A (en) | 1989-04-12 |
| CN1013052B true CN1013052B (en) | 1991-07-03 |
Family
ID=4815495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87105913 Expired CN1013052B (en) | 1987-10-09 | 1987-10-09 | The connecting means of tube-to-tube sheet connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013052B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100365332C (en) * | 2005-03-04 | 2008-01-30 | 中芯国际集成电路制造(上海)有限公司 | Apparatus for preventing gas leakage |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007007370A1 (en) * | 2007-02-12 | 2008-08-14 | Contitech Techno-Chemie Gmbh | Connecting arrangement for fluid lines |
| CN106736229B (en) * | 2016-12-01 | 2019-03-15 | 华电重工股份有限公司 | A kind of restorative procedure and prosthetic device of conduit |
| CN107725951A (en) * | 2017-11-08 | 2018-02-23 | 宁波富尔顿热能设备有限公司 | A kind of expanding joint method and expansion-joint structure of tube sheet and pipe |
-
1987
- 1987-10-09 CN CN 87105913 patent/CN1013052B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100365332C (en) * | 2005-03-04 | 2008-01-30 | 中芯国际集成电路制造(上海)有限公司 | Apparatus for preventing gas leakage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032387A (en) | 1989-04-12 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |