US1972082A - Surface hardened cast iron article of manufacture - Google Patents
Surface hardened cast iron article of manufacture Download PDFInfo
- Publication number
- US1972082A US1972082A US544291A US54429131A US1972082A US 1972082 A US1972082 A US 1972082A US 544291 A US544291 A US 544291A US 54429131 A US54429131 A US 54429131A US 1972082 A US1972082 A US 1972082A
- Authority
- US
- United States
- Prior art keywords
- cast iron
- nitriding
- chromium
- manufacture
- article
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
Definitions
- My invention relates to the surface hardening of articles made of cast iron alloys, the hardening being efiected by the action of nitrogencontaining compounds, for example, ammonia.
- the silicon content should be raised, so that it will about equal or exceed the percent- 5 age of chromium or of chromium and tungsten when the latter is also present.
- nitriding articles made from alloys within the foregoing range of proportions it is advan- "tageous to subject the article to a preliminary heat treatment to bring the metal into the sorbitic state.
- This result may be obtained by heating the article to a temperature of around 950 C. and then quenching in a salt bath that has been heated to about 200 C.
- This treatment may be Manganese Up to 1% Silinn'n 1 t0 4% Chromium 1.5 to 3.5% 30 with the balance principally iron.
- Tungsten may be present in a proportion not exceeding 2%, and as further additions upto 1% each of one or more of the elements titanium, vanadium and molybdenum may be present.
- Alloy (a) showed a hardness before n'ltridlng of 490 Vickers-Brinell and after nitriding a hardness of 710. Alloy (b) showed a hardness before .55 nitriding of 424 Vlckers-Brinell and after nitride balance substantially all iron.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
Patented Sept. 4, 1934 1,972,082 4 SURFACE HARDENED CAST IRON ARTI OF MANUFACTURE Marie Louis Andre Babinet,
Boulogne-sur- Seine, France, assignor, by mesne assignments, to The Nitricastiron Corporation, a corporation of Delaware No Drawing. Applicatio'nJune 13, 1931,
Serial'No. 544,291
8 Claims. (01148-31 My invention relates to the surface hardening of articles made of cast iron alloys, the hardening being efiected by the action of nitrogencontaining compounds, for example, ammonia.
It is known that'certain cast iron alloys may be hardened on their surface portions by subjecting them to a nitriding-treatment, i.'e. by heating an article made therefrom at a moderate temperature in contact with ammonia or ansiderable period oftime. So far as I am aware,
all of the cast iron alloys heretofore used for' Carbon 2.0 to 4% other nitrogen-liberating compound for a con ing a hardness of "180. The nitriding treatment applied in both cases consisted inheating the casting in the presence of ammonia gas for a period of hours at 500 C.
In cases where it is desired that the castings produced shall be easily machinable either in their'natural or as cast condition, or after a suitable heat treatment preliminary to the nitriding operation, the silicon content should be raised, so that it will about equal or exceed the percent- 5 age of chromium or of chromium and tungsten when the latter is also present.
In nitriding articles made from alloys within the foregoing range of proportions, it is advan- "tageous to subject the article to a preliminary heat treatment to bring the metal into the sorbitic state. This result may be obtained by heating the article to a temperature of around 950 C. and then quenching in a salt bath that has been heated to about 200 C. This treatment may be Manganese Up to 1% Silinn'n 1 t0 4% Chromium 1.5 to 3.5% 30 with the balance principally iron. Tungsten may be present in a proportion not exceeding 2%, and as further additions upto 1% each of one or more of the elements titanium, vanadium and molybdenum may be present.
While these alloys do not acquire as high a surface hardness by 'nit'riding as do alloys containing aluminum, it is easy to prepare them and to produce castings therefrom. The following are representative examples of alloys coming within the present invention:
o)- g (b) Carbon mm) a a 3117 Combined carbo 2.3% 1 mi 4 Silicon 1.20% 1.547
anganese-- 10% 11% Chromium"--- 1757 1. 91% Tifnnlnm 0 Vanadium... .45 0 '1- d 1. a a o Molybdenum .25 o "50 Ir I Balance.
. Alloy (a) showed a hardness before n'ltridlng of 490 Vickers-Brinell and after nitriding a hardness of 710. Alloy (b) showed a hardness before .55 nitriding of 424 Vlckers-Brinell and after nitride balance substantially all iron.
followed by a re-heating treatment at alower temperature if desired, although ordinarily the heating necessary to effect the nitriding will bring about such further change in the internal structure of the metal as may be desired.
I claim:
1. An article hardened in its surface portions by nitriding and consisting of an aluminum-free cast irorrhailloy containing fro1n 2.0 to 4% of carbon, of w ch a part is present in combined form, 5 from 1.5 to 3.5% of chromium, and from 1 to 4% of silicon with the balance substantially all iron.
2. An article hardened in its surface portions by nitriding and consisting of an aluminum-free cast iron alloy containing from 2.0 to 4%. of carbon, of which a part is present in combined form,
from 1.5 to 3.5% of chromium, from 1 to 4% of silicon, and an effective and substantial amount but not exceeding about 1% each of the metals titanium, vanadium and molybdenum, with the 95 3. An article hardened in its surface portions by nitriding and consisting of an aluminum-free cast iron alloy containing from 2.0 to 4% of carbon, of which a part is present in combined form, 1 from 1.5 to 3.5% of chromium, from 1 to 4% of. silicon, and an effective and substantialv amount but not exceeding about 1% of a metal from the group consisting of titanium, vanadium and molybdenum, with the balance substantially all 1 5 iron.
4. An article hardened in its surl'aceportions 'by nitrid-ing and consisting of an aluminum-free cast iron alloy containing from 2.0 to 4% of carbon, of which a part is present in combined 2 form, from 1.5 to 3.5% of chromium, irom 1 to 4% of silicon, and an effective and substantial amount but not exceeding about 2% of tungsten,
with the balance substantially all iron. I
5. An article hardened in its surface portions by nitriding and consisting of an aluminum-free cast iron alloy containing from 2.0 to 4% of carbon, of which a part is present in combined form, from 1.5 to 3.5% of chromium, from 1 to 4% of silicon, an efiective and substantial amount but not exceeding about 2% of tungsten, and an eflective and substantial amount but not exceeding about 1% of a metal from the group consisting of titanium, vanadium and molybdenum, with form, from 1.5 to 3.5% of chromium, from 1 to 4% of silicon, and an eflective and substantial amount but not exceeding about 1% ct manganese, with the balance substantially all iron.
'7. An article hardened in its surface portions by nitriding and consisting of an aluminum-free cast iron alloy containing about 3.32% carbon, oiwhich a part is present in combined form, about 1.20% silicon, about 0.70% manganese, about 1.75% chromium, about .26% titanium, about .45% vanadium and about 1.65% tungsten.
8. An article hardened in its surface portions by nitriding and consisting of an aluminum-tree cast iron alloy containing about 3.39% carbon, of which a part is present in combined form, about 1.54% silicon, about 31% manganese, about 1.91% chromium and about 0.25% molybdenum.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US544291A US1972082A (en) | 1931-06-13 | 1931-06-13 | Surface hardened cast iron article of manufacture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US544291A US1972082A (en) | 1931-06-13 | 1931-06-13 | Surface hardened cast iron article of manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
US1972082A true US1972082A (en) | 1934-09-04 |
Family
ID=24171572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US544291A Expired - Lifetime US1972082A (en) | 1931-06-13 | 1931-06-13 | Surface hardened cast iron article of manufacture |
Country Status (1)
Country | Link |
---|---|
US (1) | US1972082A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3367770A (en) * | 1965-02-01 | 1968-02-06 | Latrobe Steel Co | Ferrous alloys and abrasion resistant articles thereof |
DE19644204A1 (en) * | 1996-10-24 | 1998-04-30 | Klein Schanzlin & Becker Ag | Material for sliding machine parts |
-
1931
- 1931-06-13 US US544291A patent/US1972082A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3367770A (en) * | 1965-02-01 | 1968-02-06 | Latrobe Steel Co | Ferrous alloys and abrasion resistant articles thereof |
DE19644204A1 (en) * | 1996-10-24 | 1998-04-30 | Klein Schanzlin & Becker Ag | Material for sliding machine parts |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US1972082A (en) | Surface hardened cast iron article of manufacture | |
US2240940A (en) | Aluminum alloy | |
US2875090A (en) | Methods of forming superficial diffusion alloys on metal pieces and especially refractory metal pieces | |
US2370225A (en) | Malleable iron | |
US1943595A (en) | Hardened alloy steel and process of hardening same | |
US2046638A (en) | Process of treating metal | |
US1984458A (en) | Cast iron alloy articles | |
US1804176A (en) | Process of surface-hardening steel | |
US1944179A (en) | Ferrous alloy | |
US1944178A (en) | Ferrous alloy | |
US2145065A (en) | Drawn brass bearing alloys | |
US1924344A (en) | Surface hardened cast iron article of manufacture | |
US2105220A (en) | Ferrous metal | |
US1649398A (en) | Steel alloy | |
US1920090A (en) | Heat treatment for aluminum base alloys | |
US2103610A (en) | Alloy steels | |
US2449806A (en) | Cold hobbable steel | |
US1692936A (en) | Copper alloy | |
GB435316A (en) | Improvements relating to the production of cast iron castings surface hardened or hardenable by the nitrogen hardening process | |
US2906653A (en) | Die-casting of iron in chill-moulds | |
JPS5916950A (en) | Soft-nitriding steel | |
US1487554A (en) | Process for hardening steel alloys | |
US1723015A (en) | Molybdenum nitriding steels and process of nitriding same | |
US1017914A (en) | Cement steel plate. | |
US2058039A (en) | Hardened malleable iron |