GB1591907A - Overlapped plated steel strip for making anticorrosive double wall steel pipes - Google Patents
Overlapped plated steel strip for making anticorrosive double wall steel pipes Download PDFInfo
- Publication number
- GB1591907A GB1591907A GB52757/77A GB5275777A GB1591907A GB 1591907 A GB1591907 A GB 1591907A GB 52757/77 A GB52757/77 A GB 52757/77A GB 5275777 A GB5275777 A GB 5275777A GB 1591907 A GB1591907 A GB 1591907A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- plated
- steel strip
- alloy
- overlapped
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 85
- 239000010959 steel Substances 0.000 title claims description 85
- 239000010949 copper Substances 0.000 claims description 41
- 239000000956 alloy Substances 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 15
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 10
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 238000007796 conventional method Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000007747 plating Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000005219 brazing Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- 229910000792 Monel Inorganic materials 0.000 description 2
- 241000221535 Pucciniales Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910017755 Cu-Sn Inorganic materials 0.000 description 1
- 229910017927 Cu—Sn Inorganic materials 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- TVQLLNFANZSCGY-UHFFFAOYSA-N disodium;dioxido(oxo)tin Chemical compound [Na+].[Na+].[O-][Sn]([O-])=O TVQLLNFANZSCGY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 229940079864 sodium stannate Drugs 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Description
(54) OVERLAPPED PLATED STEEL STRIP FOR MAKING
ANTICORROSIVE DOUBLE WALL STEEL PIPES
(71) We, USUI KOKUSAI SANGYO KABUSHIKI KAISHA, a Japanese Corporation, of 131-2 Nagasawa, Shimizucho, Sunto-gun, Shizuoka, Prefecture, Japan, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to plates steel strip and in particular strip suitable for manufacturing anticorrosive double walled steel pipes of comparative small diameter (e.g.
about 30mm or less) and with a thin wall (e.g. about 2mm or less).
A steel strip plated with copper to a thickness 4 microns on both side surfaces, has been used to make double walled steel pipes but has such poor corrosion resistance that it is necessary to apply a coating or Pb base - Sn alloy, after the pipe is made. However, to apply such a coating is not only complicated but also fails to meet the high standards of corrosion resistance required. Also to coat the interior of a small diameter pipe it is difficult. Indeed it is impossible for a long pipe.
For this reason it has been proposed to use a steel strip plated with an Ni-base - Cu alloy or particularly with a Monel (Registered Trade Mark) metal, such that with a double thickness of strip, as in a double walled pipe, the alloy layers form bonding layers. However, when Ni exceeds 70% the melting point of such alloy will generally exceed 1300"C and therefore the workability will reduce. It is not desirable.
According to the present invention we propose plated steel strip comprising steel strip and, on at least one surface thereof, a coating which comprises an inner layer of a Ni - Cu alloy in which the Ni content is more than 50% by weight (hereinafter referred to as a Ni base - Cu alloy) and an overlying outer layer of copper or a Cu - Sn alloy in which the Cu content is more than 50% by weight (hereinafter referred to as a Cu base - Sn alloy). When a double thickness of such plated steel strip is pressed, jointed and shaped and is heat treated, it will be bonded at or far below the melting point of copper, the bond being well able to withstand bending and expansion and having a high corrosion resistance. The said layers may be applied to the steel strip by electroplating. However, the lower Ni base - Cu alloy layer may be obtained by either an alloy-plating method or by covering a Ni-layer with a Cu layer (the layer being applied separately by electroplating) and heating to cause alloying of the two layers. Both of thus obtained lower layers can be equally used for the present invention.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings of which:
Figure 1 is an elevation of a coil-shaped stock of a plated steel strip according to the present invention.
Figure 2 is a magnified sectional view of a double wall steel pipe formed of said steel strip.
Figure 3 is a magnified sectional view on line A-A in Figure 1.
Figure 4 is a magnified sectional view on line B-B of the double wall steel pipe shown in
Figure 2 before brazing.
Figure 5 is a sectional view corresponding to Figure 3 of the above mentioned overlapped plated steel strip heat-treated at a brazing temperature.
Figure 6 is a sectional view corresponding to Figure 4 after brazing.
Figure 7 is a view corresponding to the above mentioned sectional view on line A-A in another embodiment.
Figure 8 is a view corresponding to the above mentioned sectional view on line B-B in
Figure 2 of a double wall steel pipe obtained from a steel strip overlapped and plated on one surface and having the section in Figure 7.
In Figure 1, s is an overlapped plated steel strip according to the present invention to be applied to make anticorrosive double wall steel pipe,s' is a coil of said overlapped plated steel strip. Said overlapped plated steel strips is provided with an overlapped plated layer 5 on one or each of both side surfaces. The formation of said layer 5 is shown in Figure 3 or 7 showing the sectional view on line A-A in Figure 1. 1 is a steel strip. 5 is an overlapped plated layer formed on one or each side surface of said steel strip. Said layer 5 has a plated layer 2 consisting of an Ni base - Cu alloy as an inner layer and a plated layer 3 consisting of copper or a Cu base - Sn alloy as an outer layer. Figure 3 shows said overlapped plated layer 5 formed on each side surface of the steel strip. Figure 7 shows the same formed on one surface.
An example of a method of making a double wall steel pipe by using plated steel strip is shown in USP 2,014,982 except said overlap-plated steel strip. Figure 2 shows the crosssection of a double wall steel pipe p obtained by the method of the above mentioned USP.
The double wall steel pipep is made by pressing and jointing together in a double wall from an inner pipe part p, and outer pipe part p2 formed by contacting sloped edges S l and S2 formed on the width and edges of the steel strip 1 with both sides of a middle offset part So, then heating them so that the plated layer between the pressed parts may be melted and bonding both pipe parts p, and p2 by making said layer a brazing layer. The section on line B-B in
Figure 2 is shown as divided into a section when said parts are not bonded before heating and a section when they are bonded by heating. Figure 4 shows the section of an unbonded double steel pipe before the heat-treatment. Figure 6 shows the section on line B-B of a bonded double wall pipe after the heat-treatment. p, is an inner side surface of the inner pipe part p, before or after the heat treatment, and P is an outer side surface of the outer pipe part p2 before or after the heat treatment.
Now, if the section of the overlapped plated layer before the heat-treatment as shown in
Figure 3 and 4 is compared with the section in Figures 5 and 6 showing the state after the heat-treatment, it will be found that, after the heat-treatment, a diffused layer 4' is formed on a plated boundary 4 before the heat-treatment and, by the heat-treatment, a pressed and jointed boundary 6 formed by the upper layers 3 with each other before the heating vanishes and both layers 3 become integral to form a brazed layer w (3.3).
The above mentioned heat-treatment is heating operation at a temperature lower than the melting point of the inner layer but higher than the melting point of the outer layer.
The Cu content of the Cu - Sn alloy is more than 50%. When Cu is less than 50%, the melting point is reduced but the bonding force is poor and this is not desirable. If the Ni content of the Ni - Cu alloy is increased to above 50%, however, not only does the melting point increase but the anticorrosive properties are improved also.
The present invention has made it possible to double wall and braze a steel strip by applying to it a coating of an Ni base - Cu alloy which is high in the anticorrosion but has not been applied as the workability is a problem because of the high melting point. Using the overlapped plated steel strip of the present invention, not only the operation of brazing the double wall steel pipe can be carried out at or far below the temperature of the conventional copper plating but also the anticorrosion of said alloy layer is further increased by the formation of the above mentioned diffused layer 4'. Also, the advantage that the double wall steel pipe can be obtained without impairing bending and expand workabilities is large.
Preferably, the inner layer consists of an alloy of 70% Ni and 30% Cu and the outer layer consists of copper or an alloy of 80% Cu and 20% Sn. When a steel strip coated with such an overlapped layer is to be double walled and brazed, through the inner plating layer of the alloy of 70% Ni and 30% Cu, which has a melting point of 1300"C the brazing can be done by maintaining the temperature in the furnace at about 11 20 C when the outer layer is Cu and at about 1000"C when the outer layer is the Cu-Sn alloy. The steel strip can be brazed without varying the composition of the inner layer.
Illustrated in Figures 3 to 6 is an example of an overlapped plated layer formed on each of both side surfaces of a steel strip. Shown in Figures 7 and 8 is an example of the case of forming it on one side surface. Figure 8 shows the section of a double wall steel pipe obtained by double walling an overlapped plated steel strip having the section illustrated in Figure 7 with the plating layer 5 directed outward and pressing, jointing and heating it. In Figure 8, numeral 3' indicates a boundary of the outer layer and steel strip fused together by the heat-treatment. The illustration of the section in Figure 8 before the heating is omitted. The above mentioned diffused layer 4' is understood to be formed by the diffusion of the copper or Cu base - Sn alloy forming the outer layer on the boundary surface of the Ni base - Cu alloy layer of a high melting point forming the inner layer when said copper metal or Cu - Sn alloy is melted by heating. Further, an example of the effect of increasing the anticorrosion obtained by this diffused layer 4' will be understood by the comparison of samples Nos. 1 and 2 in the below mentioned Table 1 and the comparison of samples Nos. 3 and 4 in Table 2.
Table 1
200 300 500 800 1300 1800 2300
No. 1 6R 1/3RR 1/2RR 2/3RR 3/4RR
No. 2 3R 1/3RR 1/2RR 2/3RR
Notes: 1) S indicates a sample number. No.1 is a sample before the heat-treatment.
No.2 is a sample in which a diffused layer 4' was formed on the plated boundary
by the heat-treatment.
For details of the samples, refer to the paragraph of "Preparation of Samples" in
Example 1.
2) The size of the sample is of a width of 48mm, length of 200mm and thickness of
0.35mm.
3) H indicates time in hours.
4) R indicates red rust specks.
RR indicates fluid red rusts.
For the details, refer to the paragraph of "Salt Water Spray Test" at the end of
Example 1.
Table 2
200 300 500 800 1300 1800 2300
No. 3 3R 13R 1/2RR 2/3RR 3/4RR All
No. 4 1R 7R 1/2RR 2/3RR 3/4RR
Notes: 1) S indicates a sample number.
No.3 is a sample before the heat-treatment.
No.4 is a sample in which a diffused layer 4' was formed on the plated boundary
by the heat-treatment.
For details of the samples, refer to the paragraph of "Preparation of Samples" in
Example 2.
2) The size of the sample is the same as in Table 1.
3) H indicates time in hours 4) The same is mentioned in Note 4) of Table 1.
Example 1: (preparation of samples)
A steel strip 1 of a material of SPC-1, thickness of 0.35mm, width of 48.0mm and length of 4500mm was used, the surfaces were cleaned in the ordinary manner, an overlapped plated layer 5 was formed in the following manner on each of both cleaned side surfaces, the steel strip was cut to be 200mm long, one of the cut pieces was made a sample No. 1 as it was and the other piece was heated for about 5 minutes at a furnace temperature of about 1000"C in an atmosphere of a reducing gas obtained by decomposing an ammonia gas and was then gradually cooled in the reducing gas to form a diffused layer 4' as illustrated in Figure 5 and was made to sample No. 2 to be tested.
Manner of forming the inner layer 2:
A plating solution of a pH of 4.5 consisting of a composition of 5g/e of copper sulfate, 25gut of nickel sulfate, 20gaze e of glycine and 40g/e of citric acid was used, a steel strip of the above mentioned dimensions was made a cathode, a Monel (Registered Trade Mark) metal was made an anode, the solution temperature was kept at the normal temperature, an electric current was passed for 15 minutes at a cathode current density of 1 ampere/dm2 and a plated layer of a thickness of 4 microns consisting of an alloy of 70% by weight Ni and 30% by weight Cu was obtained as an inner layer 2.
A plating solution of a pH of 13 consisting of a composition of 35gut of copper cyanide, 30g/e of sodium stannate, 60gut of sodium cyanide and 8g/e of sodium hydroxide was used, the steel strip forming the above mentioned inner layer 2 was made a cathode, a bronze metal was made an anode, the solution temperature was kept at 65"C, an electric current was passed for 5 minutes at a cathode current density of 5 amperes/dm2 and a plated layer of a thickness of 4 microns consisting of an alloy of 80% by weight Cu and 20% by weight Sn was obtained as an outer layer 3 on the above mentioned inner layer 2.
(Test Results)
When the above mentioned obtained samples Nos. 1 and 2 were subjected to the below mentioned salt water spray tests, as mentioned in Table 1, the sample No.2 in which the diffused layer 4' was formed on the plated boundary 4 by the heat-treatment was higher in the anticorrosion.
Salt water spray test:
It was made by the provision of JIS Z-2371 and the records were taken in the following manner.
In the Table, R indicates red rust specks and RR indicated fluid res rusts. The indications by the numerals and letters attached to these products R and RR show respective generating states at the time of recording. The numeral represents the number of the products on both sides of the sample. "All" shows that all the surface was covered. The fraction, for example 1/3 RR shows that 1/3 of all the surface was covered with RR. The record of R shows the generation of only R. If RR was generated, only RR was recorded irrespective of the generation of R.
Example 2: (Preparation of samples)
In the same manner as in Example 1 except that the composition of the outer layer 3 of the overlapped plated layer 5 was varied to be as follows and the heating temperature in the atmosphere of the reducing gas was made 1120"F, a sample No. 3 before the heat-treatment and a sample No. 4 heat-treated to form a diffused layer 4' on the plated boundary were obtained to be tested.
Manner of forming the inner layer 2:
The same as in Example 1.
Manner of forming the outer layer 3: A plating solution of a pH of 12.5 consisting of a composition of 1 15gaze of copper cyanide, 125g/e of sodium cyanide and 25g/e of sodium hydroxide was used, the steel strip forming the above mentioned inner layer 2 was made a cathode, pure copper was made an anode, the solution temperature was kept at 55"C, an electric current was passed for 4 minutes at a cathode current density of 4.5 amperes/dm2 and a copper-plated layer of a thickness of 4 microns was obtained as an outer layer 3.
(Test Results)
When the above mentioned obtained samples Nos. 3 and 4 were sobjected to the salt water spray tests in the same manner as in Example 1, the results mentioned in Table 2 were obtained. These results show that the sample in which a diffused layer 4' was formed on the plated boundary 4 by the heat-treatment was higher in the anticorrosion.
Example 3: (Preparation of samples)
In the same manner as in Example 1, three overlapped plated steel strips having the same overlapped plated layer as in the case of Example 1 formed on each side surface were obtained. Said overlapped plated steel strips were respectively double walled, pressed and jointed in the ordinary manner and were heated for 5 minutes at a furnace temperature of about 1000"C in an atmosphere of a reducing gas obtained by decomposing an ammonia gas to obtain three double wall steel pipes of an outside diameter of 8mm having the shapes of the sections shown in Figures 2 and 6. They were cut to be 300mm long. 10 pieces were taken at a random as samples. Five of them were subjected to bending tests. Five were subjected to expanding tests.
(Test Results)
The tests were made by ASTM A 254 to obtain the following results. These results show that the samples were not inferior to conventional products.
Tending test passing rate: 100%
Expanding test passing rate: 100%
Example 4: (Preparation of samples)
Three double wall steel pipes were obtained in the same manner as in Example 3 except that the overlapped plated steel strips mentioned in Example 2 were used and the furnace temperature was made 11 20 C. Said steel pipes were cut in the same manner. Samples were taken in the same manner. Five of them were subjected to bending tests. Five were subjected to expanding tests.
(Test Results)
The tests were made by ASTM A 254 to obtain the following results.These results show that the samples were not inferior to conventional products.
Bending test passing rate: 100%
Expanding test passing rate: 100%
Example 5: (Preparation of samples)
A one-surface overlaped plated steel strip having the same overlapped plated layer as in the case of Example 1 formed on one surface was obtained. In the same manner as in
Example 3 except that this overlapped plated steel strip was double walled with the overlapped plated surface directed outside and was pressed and jointed a double wall steel pipe of the sections shown in Figs. 2 and 8 was obtained.In the same manner as in the case of Example 3, samples were taken and tested.
(Test Results)
The tests were made in the same manner as in Example 3 to obtain the following results:
Bending test passing rate: 100%
Expanding test passing rate: 100%
Example 6:
In the same manner as in the case of Example 4 except that a one-surface overlapped plated steel strip having the same overlapped plated layer as in the case of Example 2 formed on one surface was used, was double walled with the plated surface directed inside and was pressed and jointed, a double wall steel pipe was obtained. Said steel pipe was cut in the same manner.
Samples were taken in the same manner. Five of them were subjected to bending tests. Five were sobjected to expanding tests.
(Test Results)
The tests were made by ASTM A 254 to obtain the following results. These results show that the samples were not inferior to conventional products.
Bending test passing rate: 100%
Expanding test passing rate: 100%
Example 7:
In the same manner as in Example 1 except that the lower layer 2 comprising Ni base - Cu alloy was formed in the under mentioned manner the overlapped plated layer 5 was formed.
Samples corresponding to the sample No. 1 and No. 2 as disclosed in Example 1 were taken and tested.
Manner of forming the inner layer 2:
A steel strip of the same quality and dimension as of the steel strip disclosed in Example 1 was used. Ni layer of a thickness of 3.5cue was first electro-plated on the steel plate surface by the conventional method and then Cu layer of a thickness of l.5,u was electro-plated on thus formed Ni layer. The steel plate on which two layers were thus electroplated to be overlapped was heated at 11 200C for two hours in the furnace having an atmosphere of a reducing gas in the same manner as in Example 1 and then slowly cooled in the reducing gas, thereby obtaining as an inner layer an alloy layer of a thickness of about 5 microns consisting of 70% by weight Ni and 30% by weight of Cu.
(Test results)
The same test results as given in Table 1 were obtained.
Example 8: (Preparation of samples)
In the same manner as in the case of Example 2 except that an inner layer 2 consisting of Ni base - Cu alloy was formed and an overlapped plated layer 5 was formed. Samples corresponding the sample No. 3 and sample No. 4 in Example 2 were prepared and tested.
Manner of forming the inner layer 2:
In the same manner as in Example 7 except that Ni layer of 3.5cm thick and Cu layer of 1 .5,u thick were electroplated to be reversely overlapped an alloy layer of the same composition as in Example 7 was obtained as the inner layer.
(Test Results)
The same test results as given in Table 2 were obtained.
WHAT WE CLAIM IS:
1. Plated steel strip comprising steel strip and, on at least one surface thereof, a coating which comprises an inner layer of a Ni - Cu alloy in which the Ni content is more than 50% by weight and an overlying outer layer of copper or a Cu - Sn alloy in which the Cu content is is more than 50% by weight.
2. Plated steel strip according to claim 1 wherein the inner layer is of an alloy of 70% by weight Ni and 30% by weight Cu.
3. Plated steel strip according to claim 1 wherein the outer layer is of an alloy of 80% by weight Cu and 20% by weight Sn.
4. Plated steel strip constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. Plated steel strip comprising steel strip and, on at least one surface thereof, a coating which comprises an inner layer of a Ni - Cu alloy in which the Ni content is more than 50% by weight and an overlying outer layer of copper or a Cu - Sn alloy in which the Cu content is is more than 50% by weight.
2. Plated steel strip according to claim 1 wherein the inner layer is of an alloy of 70% by weight Ni and 30% by weight Cu.
3. Plated steel strip according to claim 1 wherein the outer layer is of an alloy of 80% by weight Cu and 20% by weight Sn.
4. Plated steel strip constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
5. Double walled steel pipe constructed and arranged substantially as hereinbefore
described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9485677A JPS5428738A (en) | 1977-08-08 | 1977-08-08 | Double plated band steel for use in making corrosion resistant overlapped steel pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1591907A true GB1591907A (en) | 1981-07-01 |
Family
ID=14121664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB52757/77A Expired GB1591907A (en) | 1977-08-08 | 1977-12-19 | Overlapped plated steel strip for making anticorrosive double wall steel pipes |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5428738A (en) |
| AU (1) | AU497688B1 (en) |
| CA (1) | CA1079463A (en) |
| FR (1) | FR2399916A1 (en) |
| GB (1) | GB1591907A (en) |
| IT (1) | IT7848109A0 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2169621A (en) * | 1985-01-12 | 1986-07-16 | Maschf Augsburg Nuernberg Ag | Metallic component with corrosion-resistant oxidic coating applied to opposite sides |
| US5297410A (en) * | 1991-12-10 | 1994-03-29 | Bundy International Limited | Method of manufacturing a multiple-walled tube |
| US5553640A (en) * | 1992-06-27 | 1996-09-10 | Hille & Muller | Stainless steel strip plated with brazing alloy for multilayer tube manufacturing |
| EP1181993A1 (en) * | 2000-08-18 | 2002-02-27 | Ti Group Automotive Systems Limited | A method for manufacturing a multiple walled tube |
| WO2008128371A1 (en) * | 2007-04-20 | 2008-10-30 | Innospin Ag | Method for producing heat exchanger pipes and heat exchanger pipes |
| EP3017890A1 (en) * | 2014-11-06 | 2016-05-11 | TI Automotive (Heidelberg) GmbH | Multiple-wall pipe and a method for producing the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3103526C2 (en) * | 1981-02-03 | 1985-11-14 | Deutsche Gesellschaft für Wiederaufarbeitung von Kernbrennstoffen mbH, 3000 Hannover | Multi-layer transport and storage container for radioactive waste |
| JPH05247501A (en) * | 1992-03-06 | 1993-09-24 | Toshiba Corp | Conductive material, its production and squirrel-cage induction machine using the material |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1015678A (en) * | 1950-03-01 | 1952-10-17 | Bundy Tubing Co | Tube manufacturing process |
| NL106722C (en) * | 1954-05-19 | |||
| US3397445A (en) * | 1965-09-30 | 1968-08-20 | Ulmer | Method of making bimetal tubing |
| JPS5144887B1 (en) * | 1971-08-04 | 1976-12-01 | ||
| US3875027A (en) * | 1973-06-29 | 1975-04-01 | Bundy Corp | Method of electroplating tubing prior to terne alloy coating |
-
1977
- 1977-08-08 JP JP9485677A patent/JPS5428738A/en active Granted
- 1977-12-14 AU AU31545/77A patent/AU497688B1/en not_active Expired
- 1977-12-19 CA CA293,314A patent/CA1079463A/en not_active Expired
- 1977-12-19 GB GB52757/77A patent/GB1591907A/en not_active Expired
-
1978
- 1978-01-05 FR FR7800225A patent/FR2399916A1/en active Granted
- 1978-02-17 IT IT7848109A patent/IT7848109A0/en unknown
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2169621A (en) * | 1985-01-12 | 1986-07-16 | Maschf Augsburg Nuernberg Ag | Metallic component with corrosion-resistant oxidic coating applied to opposite sides |
| US5297410A (en) * | 1991-12-10 | 1994-03-29 | Bundy International Limited | Method of manufacturing a multiple-walled tube |
| US5553640A (en) * | 1992-06-27 | 1996-09-10 | Hille & Muller | Stainless steel strip plated with brazing alloy for multilayer tube manufacturing |
| EP1181993A1 (en) * | 2000-08-18 | 2002-02-27 | Ti Group Automotive Systems Limited | A method for manufacturing a multiple walled tube |
| US6639194B2 (en) | 2000-08-18 | 2003-10-28 | Ti Group Automotive Systems Limited | Method for manufacturing a multiple walled tube |
| EP1433544A1 (en) * | 2000-08-18 | 2004-06-30 | Ti Group Automotive Systems Limited | A method for manufacturing a multiple walled tube |
| US6887364B2 (en) | 2000-08-18 | 2005-05-03 | Ti Group Automotive Systems Limited | Method for manufacturing a multiple walled tube |
| WO2008128371A1 (en) * | 2007-04-20 | 2008-10-30 | Innospin Ag | Method for producing heat exchanger pipes and heat exchanger pipes |
| EP3017890A1 (en) * | 2014-11-06 | 2016-05-11 | TI Automotive (Heidelberg) GmbH | Multiple-wall pipe and a method for producing the same |
| CN105583540A (en) * | 2014-11-06 | 2016-05-18 | Ti汽车海德堡有限公司 | Multi-Walled Pipe And Manufacture Thereof |
| US10260660B2 (en) | 2014-11-06 | 2019-04-16 | Ti Automotive (Heidelberg) Gmbh | Multi-walled pipe and manufacture thereof |
| EP3851218A1 (en) * | 2014-11-06 | 2021-07-21 | TI Automotive (Heidelberg) GmbH | Multi-wall pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2399916B1 (en) | 1980-04-04 |
| FR2399916A1 (en) | 1979-03-09 |
| JPS5710959B2 (en) | 1982-03-01 |
| AU497688B1 (en) | 1978-12-21 |
| IT7848109A0 (en) | 1978-02-17 |
| CA1079463A (en) | 1980-06-17 |
| JPS5428738A (en) | 1979-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931219 |