US1549022A - Method of treating the surfaces of cold-worked iron chromium alloys - Google Patents
Method of treating the surfaces of cold-worked iron chromium alloys Download PDFInfo
- Publication number
- US1549022A US1549022A US758371A US75837124A US1549022A US 1549022 A US1549022 A US 1549022A US 758371 A US758371 A US 758371A US 75837124 A US75837124 A US 75837124A US 1549022 A US1549022 A US 1549022A
- Authority
- US
- United States
- Prior art keywords
- cold
- alloys
- treating
- articles
- chromium
- 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 - Lifetime
Links
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 title description 9
- 238000000034 method Methods 0.000 title description 7
- 229910000599 Cr alloy Inorganic materials 0.000 title description 4
- 239000000788 chromium alloy Substances 0.000 title description 4
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 8
- 229910017604 nitric acid Inorganic materials 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 229910000640 Fe alloy Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 241001061036 Otho Species 0.000 description 1
- 241000382509 Vania Species 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
Definitions
- This invention relates to chromium iron alloys and more particularly to those alloys known as stainless iron and stainless steel.
- the chromium content may vary between 8% and and the carbon content may vary depending upon the particular use to, which articles made from the alloy are to be put.
- the alloy contain silicon and other metalloids. 11 one alloy with which I havehad experience, the chromium content is approximately 12% and the carbon 'is approximately 12%.
- This alloy when annealed, is suitable for the manufacture of articles such as pump shafts, valve stems, bolts, nuts,
- the metal is worked coldiand by this I mean machining operations such as the cutting or grinding of threads and other surfaces.
- the surface has been physically distorted by cold working, can be made more resistant to corrosion than are the surfaces of hardened and tempered articles given a commercial polish.
- the method may be carried out by merely immersing the machined articles composed of such alloys in a bath of hot nitric acid for a few minutes and such bath will preferably be a 12% to 15% solution.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Description
Patented Aug. 11, 1 925..
UNITED STATES PATENT OFFICE.
omno M. own, or TARENTUM, rnimsrnvnnm, assre'non m VALLEY nonnme oonronarrou, or nnaoxnmtmqa, PENNSYLVANIA, A conronarzor; or 2mm- SYL'VANIA.
METHOD TREATING THE SURFACES OF COLD-WORKED IRON CHROMIUM ALLOYS.
No Drawing.
- the Surfaces of Cold-Worked Iron Chromium Alloys, of which the following is a specification. I
This invention relates to chromium iron alloys and more particularly to those alloys known as stainless iron and stainless steel. In such alloys, the chromium content may vary between 8% and and the carbon content may vary depending upon the particular use to, which articles made from the alloy are to be put. The alloy contain silicon and other metalloids. 11 one alloy with which I havehad experience, the chromium content is approximately 12% and the carbon 'is approximately 12%. This alloy, when annealed, is suitable for the manufacture of articles such as pump shafts, valve stems, bolts, nuts,
screws, pole line hardware and various other machined articles. In making such articles, the metal is worked coldiand by this I mean machining operations such as the cutting or grinding of threads and other surfaces.
It has been found that when such material is worked cold,the surface is physically distorted and does not resist corrosion to the desired and necessary degree, unless it is polished. The polishlng of such alloys is difficult and expensive and in many cases, practically impossible.
I have discovered that if the physically distorted surfaces of articles made from iron chromium alloys having a chromium content between 8% and 60% are treated with a nitric acid solution, their resistance to corrosion is greatly increased. Alloys containing between 9% and 16% of chromium with carbon under 1% have their resistance to corrosion increased to a marked degree by immersing them in a hot nitric acid solution.
of between 12% and 15% and the resistance is increased even though the article has not been hardened, tempered and polished.
The surface of articles made from such .alloys in the annealed condition even though Application filed December 27, 1924'. Serial No. 758,371.
the surface has been physically distorted by cold working, can be made more resistant to corrosion than are the surfaces of hardened and tempered articles given a commercial polish.
I am aware that such articles as sheets and plates composed of such alloys have been pickled to remove scale and that in such pickling, nitric acid solutions have been used. So far as I am aware, however, no one has discovered howto increase the resistance to corrosion of surfaces that have been physically distorted by cold working except by polishing such surfaces.
My discovery provides a simple and cheap methodof rendering such surfaces highly resistant to corrosion."
The method may be carried out by merely immersing the machined articles composed of such alloys in a bath of hot nitric acid for a few minutes and such bath will preferably be a 12% to 15% solution.
In some way not definitely understood by me, this treatment increases the resistance to corrosion of these physically distorted s'urbined with the chromium. Nevertheless, the
fact remains that such treatment is efiective.
Having thus described my invention, what I claim is 1. The method of increasing the. resistance to corrosion of articles formed cold from chromium iron alloys, which consists in treating the surfaces of such articles with a solution of nitric acid.
2. The method of increasing the resistance to corrosion of the machined surfaces of articles formed from chromium iron alloys, which consists in treating such surfaces with a solution of nitric acid.
3. The method of increasing the resistance to corrosion of machined surfaces of articles formed from chromium iron alloys having a chormium content of between 8% and 60%, which consists in immersing such I treating the surfaces of such articles with a. of nitric acid of approximately 12% 'or solution of nitric acid. 15%.
5. The method of increasing the resistance In testimony whereof, I have hereunto 10 to corrosion of articles formed cold from subscribed my name this 22nd day of Deceml chromium iron alloys having a chromium ber, 1924.
. content between 8% and 60%, which consists in immersing such articles in a hot solution OTHO M. OTTE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US758371A US1549022A (en) | 1924-12-27 | 1924-12-27 | Method of treating the surfaces of cold-worked iron chromium alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US758371A US1549022A (en) | 1924-12-27 | 1924-12-27 | Method of treating the surfaces of cold-worked iron chromium alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1549022A true US1549022A (en) | 1925-08-11 |
Family
ID=25051490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US758371A Expired - Lifetime US1549022A (en) | 1924-12-27 | 1924-12-27 | Method of treating the surfaces of cold-worked iron chromium alloys |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1549022A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2451869A (en) * | 1944-10-10 | 1948-10-19 | Shell Dev | Catalyzed oxidation processes |
| US2576680A (en) * | 1945-09-15 | 1951-11-27 | Electro Chimie Metal | Method for increasing the resistance to corrosion of stainless steel |
| US2704883A (en) * | 1952-02-18 | 1955-03-29 | United States Steel Corp | Method of welding carbon steel to stainless steel |
| US2837407A (en) * | 1955-07-08 | 1958-06-03 | Rau Eric | Method of reducing metallic corrosion by fuming nitric acid by addition of fluoride ion to acid |
| US2943954A (en) * | 1958-02-10 | 1960-07-05 | Mead Corp | Casting surface for producing castsurfaced mineral coated paper |
| US3370991A (en) * | 1963-05-31 | 1968-02-27 | Corning Glass Works | Method of preoxidation of stainless steel |
| US4968362A (en) * | 1986-10-08 | 1990-11-06 | American Cyanamid Company | Dark metallic product |
-
1924
- 1924-12-27 US US758371A patent/US1549022A/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2451869A (en) * | 1944-10-10 | 1948-10-19 | Shell Dev | Catalyzed oxidation processes |
| US2576680A (en) * | 1945-09-15 | 1951-11-27 | Electro Chimie Metal | Method for increasing the resistance to corrosion of stainless steel |
| US2704883A (en) * | 1952-02-18 | 1955-03-29 | United States Steel Corp | Method of welding carbon steel to stainless steel |
| US2837407A (en) * | 1955-07-08 | 1958-06-03 | Rau Eric | Method of reducing metallic corrosion by fuming nitric acid by addition of fluoride ion to acid |
| US2943954A (en) * | 1958-02-10 | 1960-07-05 | Mead Corp | Casting surface for producing castsurfaced mineral coated paper |
| US3370991A (en) * | 1963-05-31 | 1968-02-27 | Corning Glass Works | Method of preoxidation of stainless steel |
| US4968362A (en) * | 1986-10-08 | 1990-11-06 | American Cyanamid Company | Dark metallic product |
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