GB742399A - Improved method of treating tough cast iron and castings obtained thereby - Google Patents
Improved method of treating tough cast iron and castings obtained therebyInfo
- Publication number
- GB742399A GB742399A GB1541/53A GB154153A GB742399A GB 742399 A GB742399 A GB 742399A GB 1541/53 A GB1541/53 A GB 1541/53A GB 154153 A GB154153 A GB 154153A GB 742399 A GB742399 A GB 742399A
- Authority
- GB
- United Kingdom
- Prior art keywords
- still air
- cooled
- hours
- cast iron
- quenching
- 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
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
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 Articles (AREA)
Abstract
A process for the treatment of white cast iron comprises austenisation at a temperature slightly above that at the end of the eutectoid transformation, step-quenching to produce martensite without shrinkage cracks, reheating to a temperature in the range 430-530 DEG C., depending on the composition of the metal to produce nuclei of graphite, and graphitisation at a temperature above that of the eutectoid transformation followed by cooling in still air. The step-quenching may comprise quenching in a salt bath at a temperature above that of martensite formation for a time less than that which produces transformation to bainite followed by cooling in still air. A sand casting may be heated at 810 DEG C., quenched in a salt bath at 180 DEG C. for 1 minute and cooled in still air, reheated at 450 DEG C. for 48 hours, cooled, and finally reheated to 895 DEG C. for 14 hours and cooled in still air. For chill castings the graphitising may be at 875 DEG C. for three hours.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR742399X | 1952-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB742399A true GB742399A (en) | 1955-12-30 |
Family
ID=9141108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1541/53A Expired GB742399A (en) | 1952-02-18 | 1953-01-19 | Improved method of treating tough cast iron and castings obtained thereby |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB742399A (en) |
-
1953
- 1953-01-19 GB GB1541/53A patent/GB742399A/en not_active Expired
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