GB601975A - Improvements in the production of high strength malleable iron alloy castings - Google Patents
Improvements in the production of high strength malleable iron alloy castingsInfo
- Publication number
- GB601975A GB601975A GB5053/45A GB505345A GB601975A GB 601975 A GB601975 A GB 601975A GB 5053/45 A GB5053/45 A GB 5053/45A GB 505345 A GB505345 A GB 505345A GB 601975 A GB601975 A GB 601975A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- low alloy
- treatment
- carbon content
- normalising
- 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
- 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
- C21D5/00—Heat treatments of cast-iron
- C21D5/04—Heat treatments of cast-iron of white cast-iron
- C21D5/06—Malleabilising
- C21D5/08—Malleabilising with oxidation of carbon
- C21D5/10—Malleabilising with oxidation of carbon in gaseous agents
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)
- Heat Treatment Of Steel (AREA)
Abstract
In a process for producing malleable iron alloy castings from low alloy white cast iron containing one or more metals capable of inhibiting carbide decomposition viz:- chromium, manganese, molybdenum, nickel, vanadium, tungsten, the total carbon content is reduced by a decarburizing heat-treatment to an amount which if uniformly distributed would give a carbon content in any part of the casting equal to that required in a low alloy wrought steel, the casting then being submitted to a deep diffusion annealing under non-oxidising conditions within the temperature limits for solid solution i.e., between Ac3 and the solidus line-until a homogeneous structure with uniform carbide distribution is attained. The temperature for the diffusion annealing is preferably higher than that for decarburizing, and a normalising treatment may follow. The products of the treatment may be hardened, tempered or austempered. In an example, a low alloy cast iron containing 2.7 per cent C, 0.6 per cent Si, 1.5 per cent Mn, 0.06 per cent P, 0.03 per cent S, 0.9 per cent Cr, 0.4 per cent Mo was decarburized at 1,000 DEG C in an oxidising atmosphere until the carbon content was reduced to 0.4 per cent, followed by annealing in a neutral atmosphere at 1,150 DEG C. After normalising, hardening at 850 DEG C, and tempering at 650 DEG C, for 3 hours mechanical properties comparable to those of a low alloy steel of the same composition were attained.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH601975X | 1944-03-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB601975A true GB601975A (en) | 1948-05-18 |
Family
ID=4522803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5053/45A Expired GB601975A (en) | 1944-03-23 | 1945-02-28 | Improvements in the production of high strength malleable iron alloy castings |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB601975A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111549287A (en) * | 2020-06-28 | 2020-08-18 | 宝钢特钢韶关有限公司 | Medium carbon steel and production process thereof |
-
1945
- 1945-02-28 GB GB5053/45A patent/GB601975A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111549287A (en) * | 2020-06-28 | 2020-08-18 | 宝钢特钢韶关有限公司 | Medium carbon steel and production process thereof |
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