GB743613A - Process for making boron steel - Google Patents
Process for making boron steelInfo
- Publication number
- GB743613A GB743613A GB27883/53A GB2788353A GB743613A GB 743613 A GB743613 A GB 743613A GB 27883/53 A GB27883/53 A GB 27883/53A GB 2788353 A GB2788353 A GB 2788353A GB 743613 A GB743613 A GB 743613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- steel
- slag
- boron
- content
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Molten steel containing a normal nitrogen content is separated from its furnacing slag and is treated in a separate vessel with a slag comprising a borating agent such as borate from the group alkali metal borates, alkaline earth metal borates and boric oxide to which is added a reducing agent such as aluminium and at the same time the steel is flushed with a non-oxidising, nitrogen-free inert gas to eliminate nitrogen, thereby causing boron to enter the steel without interference by boron nitride. The borate containing slag may have the composition: .CaO.-.50-60 per cent .Al2O3.-.10-20 per cent .CaF2.-.10-15 per cent .borax.-.5-10 per cent .TiO2 and ZrO2.-.10-20 per cent The amount of this slag added is preferably 1-6 per cent by weight of the metal. The inert gas may be supplied, continuously or intermittently, till the boron content of the steel is 0,001-0,005 per cent and the nitrogen content is reduced to less than 0,005 per cent by weight. Aluminium is used to deoxidise the steel before treatment and, to protect the boron against oxidation the treated steel should contain a residual aluminium content not less than 0,02 per cent. Specifications 671,678 and 697,915 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US743613XA | 1952-10-09 | 1952-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB743613A true GB743613A (en) | 1956-01-18 |
Family
ID=22119143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27883/53A Expired GB743613A (en) | 1952-10-09 | 1953-10-09 | Process for making boron steel |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB743613A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3169058A (en) * | 1960-11-18 | 1965-02-09 | Union Carbide Corp | Decarburization, deoxidation, and alloy addition |
-
1953
- 1953-10-09 GB GB27883/53A patent/GB743613A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3169058A (en) * | 1960-11-18 | 1965-02-09 | Union Carbide Corp | Decarburization, deoxidation, and alloy addition |
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