JPS5675555A - Heat resistant cast steel hard to carburizing-rupture - Google Patents
Heat resistant cast steel hard to carburizing-ruptureInfo
- Publication number
- JPS5675555A JPS5675555A JP15268179A JP15268179A JPS5675555A JP S5675555 A JPS5675555 A JP S5675555A JP 15268179 A JP15268179 A JP 15268179A JP 15268179 A JP15268179 A JP 15268179A JP S5675555 A JPS5675555 A JP S5675555A
- Authority
- JP
- Japan
- Prior art keywords
- heat resistant
- carburizing
- cast steel
- hydrocarbon
- steel
- 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
Abstract
PURPOSE: To obtain a heat resistant cast steel hard to carburize by hydrocarbon and free from a lowering in the creep strength and ductility due to carburizing by increasing the C and Cr contents of a 25Cr-35Ni heat resistant cast steel within specified ranges.
CONSTITUTION: This cast steel contains 0.7W0.9% C, 0.5W2.5% Si, 0.5W2.0% Mn, 32W37% Ni and 28W34% Cr. By increasing the C and Cr contents of a 25Cr- 35Ni heat resistant steel, the amount of Cr carbide deposited is increased to prevent carburizing by hydrocarbon, etc. from the outside. When this steel is carburized, a change in the physical property values and strength between the carburized and noncarburized parts is reduced, and internal stress due to a difference in the thermal expansion coefficient between the parts is not produced to prevent carburizing rupture. This steel is very useful as a material for parts for equipment for manufacturing ammonia, methanol, ethylene, etc., e.g., a tube for heating hydrocarbon to high temp. and a reaction tube for catalytically or thermally decomposing hydrocarbon.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15268179A JPS5675555A (en) | 1979-11-26 | 1979-11-26 | Heat resistant cast steel hard to carburizing-rupture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15268179A JPS5675555A (en) | 1979-11-26 | 1979-11-26 | Heat resistant cast steel hard to carburizing-rupture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5675555A true JPS5675555A (en) | 1981-06-22 |
Family
ID=15545781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15268179A Pending JPS5675555A (en) | 1979-11-26 | 1979-11-26 | Heat resistant cast steel hard to carburizing-rupture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5675555A (en) |
-
1979
- 1979-11-26 JP JP15268179A patent/JPS5675555A/en active Pending
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