JPS5651520A - Production of low-temperature-service steel casting - Google Patents
Production of low-temperature-service steel castingInfo
- Publication number
- JPS5651520A JPS5651520A JP12831679A JP12831679A JPS5651520A JP S5651520 A JPS5651520 A JP S5651520A JP 12831679 A JP12831679 A JP 12831679A JP 12831679 A JP12831679 A JP 12831679A JP S5651520 A JPS5651520 A JP S5651520A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- casting
- temperature
- cracking
- castings
- 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.)
- Pending
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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
Abstract
PURPOSE:To prevent intergranular cracking defects from occuring in castings by decreasing the S of impurities in 9% Ni steel for cryogenic materials and adding the specific heat treatment to the steel castings thereof. CONSTITUTION:The S content in so-called 9% Ni steel cntg. 0.01-0.10% C, < 0.15% Si, <0.90% Mn, 8.5-12.0% Ni, and 0.15-0.50% in total of one or two kinds of Mo and W is decreased to <=0.005%. Or if S is <=0.010%, Mg is added at 0.005-0.020% or Ca is added at <=1/2 the S content. Cryogenic materials are cast by this steel and if freezing is completed, knock-out is immediately performed and the casting is quenched down to the temperature just above the bainite transformation point. The diffusion of the contained S to the grain boundaries is suppressed by this treatment, and mechanical properties are improved by cracking prevention and crystal fining. Next, the slow cooling from the bainite transformation initiation temperature down to 250 deg.C is performed under the conditions of satisfying tV<1/2 894 [(t) is the maximum wall thickness mm. of casting, and V is the rate of cooling deg.C/hr]. The cracking of the casting may be prevented perfectly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12831679A JPS5651520A (en) | 1979-10-03 | 1979-10-03 | Production of low-temperature-service steel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12831679A JPS5651520A (en) | 1979-10-03 | 1979-10-03 | Production of low-temperature-service steel casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5651520A true JPS5651520A (en) | 1981-05-09 |
Family
ID=14981750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12831679A Pending JPS5651520A (en) | 1979-10-03 | 1979-10-03 | Production of low-temperature-service steel casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5651520A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653864A (en) * | 1979-10-04 | 1981-05-13 | Sumitomo Metal Ind Ltd | Production of low-temperature steel casting |
| JPH02226799A (en) * | 1989-02-28 | 1990-09-10 | Sony Corp | Magnetic mold body |
-
1979
- 1979-10-03 JP JP12831679A patent/JPS5651520A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653864A (en) * | 1979-10-04 | 1981-05-13 | Sumitomo Metal Ind Ltd | Production of low-temperature steel casting |
| JPH02226799A (en) * | 1989-02-28 | 1990-09-10 | Sony Corp | Magnetic mold body |
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