ES483952A2 - Extruded stainless steel tubes prodn. by powder metallurgy - by cold pressing, extruding, washing off glass lubricant using sulphuric acid, cold working and heating to red heat - Google Patents
Extruded stainless steel tubes prodn. by powder metallurgy - by cold pressing, extruding, washing off glass lubricant using sulphuric acid, cold working and heating to red heatInfo
- Publication number
- ES483952A2 ES483952A2 ES483952A ES483952A ES483952A2 ES 483952 A2 ES483952 A2 ES 483952A2 ES 483952 A ES483952 A ES 483952A ES 483952 A ES483952 A ES 483952A ES 483952 A2 ES483952 A2 ES 483952A2
- Authority
- ES
- Spain
- Prior art keywords
- cold
- stainless steel
- prodn
- product
- cold working
- 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
- 239000011521 glass Substances 0.000 title abstract 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title abstract 3
- 239000000314 lubricant Substances 0.000 title abstract 3
- 239000010935 stainless steel Substances 0.000 title abstract 3
- 229910001220 stainless steel Inorganic materials 0.000 title abstract 3
- 238000005482 strain hardening Methods 0.000 title abstract 3
- 235000011149 sulphuric acid Nutrition 0.000 title abstract 3
- 239000001117 sulphuric acid Substances 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 title 1
- 238000004663 powder metallurgy Methods 0.000 title 1
- 238000005406 washing Methods 0.000 title 1
- 239000002775 capsule Substances 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 2
- 239000003921 oil Substances 0.000 abstract 2
- 239000000843 powder Substances 0.000 abstract 2
- 229910000975 Carbon steel Inorganic materials 0.000 abstract 1
- 229910004077 HF-HNO3 Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000010962 carbon steel Substances 0.000 abstract 1
- 238000010310 metallurgical process Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Lubricants (AREA)
- Powder Metallurgy (AREA)
Abstract
The parent patent described the prodn. of extruded stainless steel tubes by a powder metallurgical process in which the stainless steel powder was isostatically cold pressed in a thin-walled, pref. low alloy carbon steel capsule and then extruded, pref. at 1200 degrees C using a glass lubricant to give a dense product. In the present invention, the product (still encapsulated) is treated with aq. sulphuric acid soln. to remove glass residues, cold worked by drawing or pilger rolling, and then heated to red heat in an oxidising atmos. HF-HNO3 acid baths are not required since the H2SO4 acid soln. removes the glass residues and the cold working reduces the thickness of the capsule residue so that it can be removed by the oxidn. step. By leaving the capsule residues on the product, cold working is improved since simple oils (instead of highly chlorinated oils) can be used as lubricants and continuous advancement of the zone of deformation is facilitated. The surface quality of the finished product is also improved.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782838850 DE2838850C2 (en) | 1978-09-06 | 1978-09-06 | Process for the manufacture of cold-formed tubes from extruded stainless steel tubes produced by powder metallurgy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES483952A2 true ES483952A2 (en) | 1980-10-01 |
Family
ID=6048817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES483952A Expired ES483952A2 (en) | 1978-09-06 | 1979-09-06 | Extruded stainless steel tubes prodn. by powder metallurgy - by cold pressing, extruding, washing off glass lubricant using sulphuric acid, cold working and heating to red heat |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE878611R (en) |
| DE (1) | DE2838850C2 (en) |
| ES (1) | ES483952A2 (en) |
| FR (1) | FR2435309A2 (en) |
| RO (1) | RO78382A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2533468B1 (en) * | 1982-09-23 | 1986-03-14 | Nyby Uddeholm Ab | CAPSULE FOR BLANKS FOR EXTRUDING PARTS, ESPECIALLY TUBES |
| FR2542228B1 (en) * | 1983-03-10 | 1985-08-02 | Cegedur | PRESSURE SINTERING OF ALUMINUM ALLOY POWDERS |
| CN104741612A (en) * | 2014-11-26 | 2015-07-01 | 内蒙古北方重工业集团有限公司 | Powder high temperature alloy bar extrusion method |
| CN114273500B (en) * | 2021-12-09 | 2023-09-29 | 中航贵州飞机有限责任公司 | Application method of flexible pressurizing block for rubber bag hydroforming |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE553992A (en) * | ||||
| BE794142A (en) * | 1972-01-17 | 1973-07-17 | Int Nickel Ltd | HIGH TEMPERATURE ALLOYS |
| US3798740A (en) * | 1972-10-02 | 1974-03-26 | Davy Ashmore Ltd | Method of extruding a porous compacted mass of metal powder having a sealed outer surface |
| DE2419014C3 (en) * | 1974-04-19 | 1985-08-01 | Nyby Bruks AB, Nybybruk | Method of manufacturing stainless steel pipes and application of the method to the manufacture of composite pipes |
-
1978
- 1978-09-06 DE DE19782838850 patent/DE2838850C2/en not_active Expired
-
1979
- 1979-09-05 BE BE0/197023A patent/BE878611R/en not_active IP Right Cessation
- 1979-09-05 FR FR7922250A patent/FR2435309A2/en active Granted
- 1979-09-05 RO RO7998605A patent/RO78382A/en unknown
- 1979-09-06 ES ES483952A patent/ES483952A2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE878611R (en) | 1979-12-31 |
| DE2838850C2 (en) | 1983-12-15 |
| FR2435309A2 (en) | 1980-04-04 |
| RO78382A (en) | 1982-02-26 |
| DE2838850A1 (en) | 1980-03-27 |
| FR2435309B2 (en) | 1983-06-03 |
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