US705330A - Treatment of steel ingots for forging. - Google Patents
Treatment of steel ingots for forging. Download PDFInfo
- Publication number
- US705330A US705330A US9334102A US1902093341A US705330A US 705330 A US705330 A US 705330A US 9334102 A US9334102 A US 9334102A US 1902093341 A US1902093341 A US 1902093341A US 705330 A US705330 A US 705330A
- Authority
- US
- United States
- Prior art keywords
- forging
- ingot
- treatment
- steel ingots
- billet
- 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
- 238000005242 forging Methods 0.000 title description 11
- 229910000831 Steel Inorganic materials 0.000 title description 8
- 239000010959 steel Substances 0.000 title description 8
- 238000000034 method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000003303 reheating Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
Definitions
- This invention relates to the treatment of steel, and contemplates an improved process designed more especially for treating cast I 5 nickel-steel ingots, with the object of preventing therein the formation of streaks, working cracks, and other defects which would develop in the subsequent forging operation and impair the eiiiciency of the fin- 2o ished product.
- My improved process which is carried into effect in advance of the forging step, operates by reducing the size of the grains or crystals of the steel to prevent the formation of the defects above stated, which defects are largely the result of the separating or breaking apart of the coarse crystals during the operation of forging.
- the process may be advantageously em- 0 ployed in treating various kinds of ingots, billets,and the like, although, as stated above,
- the cast ingot is allowed to cool below the critical temperature, (550 centigrade,) at which step the scrap is cut off, and, if desired, the ingot may 40 be divided into billets.
- the ingot or billet is then placed in a suitable furnace and heated to a temperature between 750 centigrade and 850 centigrade, dependent upon the size of the ingot or billet, the larger the ingot or 5 billet the higher the temperature required. This reheating temperature is maintained for Serial No. 93,341. (No specimens.)
- the ingot or billet is directly brought to forging temperature and forged without the intermediate cooling.
- the subjecting of the ingot or billet to the stated reheating temperature for the described length of time results in a reduction of the size of the steel crystals, at the same time producing a perfectly homogeneous structure which can subsequently be safely forged without the formation of streaks and cracks and other defects which would impair the strength, utility, and appearance of the finished product.
- the ingots of the kind which my improved process is especially adapted to treat have an approximate composition of from twenty-five below six hundredths per cent. of phosphorus.
- My invention is, however, applicable to the treatment of ingots and billets of other compositions, and may be advantageously used in treating other than nickel-steel ingots and billets.
- I claim as my invention The process of treating cast-steel ingots and the like previous to forging, which consists in cooling the cast ingot to a temperature below 550 centigrade, reheating the cooled ingot to a temperature between 750 centigrade and 850 Centigrade, maintaining said reheating temperature for a period of from thirty to forty-five hours, and finally heating the ingot to forging temperature.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Description
UNITED STATES PATENT OFFICE.
CHARLES TARBELL DUDLEY, OF GOLDEN, COLORADO, ASSIGNOR OF ONE- FOURTH TO WILLIAM W. DUDLEY, FRANK L. BROWNE, AND WILLIAM T. NORTON, OF WASHINGTON, DISTRICT OF COLUMBIA.
TREATMENT OF STEEL INGOTS FOR FORGING.
SPECIFICATION forming part of Letters Patent No. 705,330, dated July 22, 1902.
Application filed February 10, 1902 To all whom it may concern.-
Be it known that 1, CHARLES TARBELL DUD- LEY, a citizen of the United States, residing at Golden, in the county of Jefferson and.
State of Colorado, have invented certain new and useful Improvements in the Treatment of Steel Ingots for Forging; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
This invention relates to the treatment of steel, and contemplates an improved process designed more especially for treating cast I 5 nickel-steel ingots, with the object of preventing therein the formation of streaks, working cracks, and other defects which would develop in the subsequent forging operation and impair the eiiiciency of the fin- 2o ished product.
My improved process, which is carried into effect in advance of the forging step, operates by reducing the size of the grains or crystals of the steel to prevent the formation of the defects above stated, which defects are largely the result of the separating or breaking apart of the coarse crystals during the operation of forging.
The process may be advantageously em- 0 ployed in treating various kinds of ingots, billets,and the like, although, as stated above,
, it is designed mainly for'treating nickel-steel ingots which are cast to be forged into the heavy grades of forgings, such as ordnance,
5 marine shafting, &c.
In practicing my improved process the cast ingot is allowed to cool below the critical temperature, (550 centigrade,) at which step the scrap is cut off, and, if desired, the ingot may 40 be divided into billets. The ingot or billet is then placed in a suitable furnace and heated to a temperature between 750 centigrade and 850 centigrade, dependent upon the size of the ingot or billet, the larger the ingot or 5 billet the higher the temperature required. This reheating temperature is maintained for Serial No. 93,341. (No specimens.)
a period of time ranging from thirty to fortyfive hours, depending upon the size of the ingot or billet, the larger the ingot or billet the longer the time required, after which the ingot or billet is allowed to cool and subsequently reheated for the forging step, or, preferably, the ingot or billet is directly brought to forging temperature and forged without the intermediate cooling. The subjecting of the ingot or billet to the stated reheating temperature for the described length of time results in a reduction of the size of the steel crystals, at the same time producing a perfectly homogeneous structure which can subsequently be safely forged without the formation of streaks and cracks and other defects which would impair the strength, utility, and appearance of the finished product.
The ingots of the kind which my improved process is especially adapted to treat have an approximate composition of from twenty-five below six hundredths per cent. of phosphorus.
My invention is, however, applicable to the treatment of ingots and billets of other compositions, and may be advantageously used in treating other than nickel-steel ingots and billets.
I claim as my invention The process of treating cast-steel ingots and the like previous to forging, which consists in cooling the cast ingot to a temperature below 550 centigrade, reheating the cooled ingot to a temperature between 750 centigrade and 850 Centigrade, maintaining said reheating temperature for a period of from thirty to forty-five hours, and finally heating the ingot to forging temperature.
In testimony whereof I affix my signature in presence of two Witnesses.
CHARLES TARBELL DUDLEY.
Witnesses:
A. H. GOLLBRAN, EUGENE H. DAWSON.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9334102A US705330A (en) | 1902-02-10 | 1902-02-10 | Treatment of steel ingots for forging. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9334102A US705330A (en) | 1902-02-10 | 1902-02-10 | Treatment of steel ingots for forging. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US705330A true US705330A (en) | 1902-07-22 |
Family
ID=2773862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US9334102A Expired - Lifetime US705330A (en) | 1902-02-10 | 1902-02-10 | Treatment of steel ingots for forging. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US705330A (en) |
-
1902
- 1902-02-10 US US9334102A patent/US705330A/en not_active Expired - Lifetime
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