|
|
|
| AN INVESTIGATION OF 15Mn26Al4 LOW-TEMPERATURE STEEL |
| Yeh Chi-shih |
|
Cite this article:
Yeh Chi-shih. AN INVESTIGATION OF 15Mn26Al4 LOW-TEMPERATURE STEEL. Acta Metall Sin, 1977, 13(3): 149-235.
|
|
|
Abstract On the basis of our past research on Fe-Mn-Al system, a new Ni-Cr-free cryogenicnon-magnetic steel-15Mn26Al4 has been developed. The steel shows stable austen-ite structure and satisfactory mechanical properties. It may be used for temperaturesas low as that of liquid hydrogen without incurring embrittlement. From our own work on Fe-Mn-Al phase diagram, since aluminum can suppressmartensite type transformation of high manganse austenite steels at low temperaturesand considering that both carbon and manganese promote the stabilization of the austen-ite structure, it is deduced that the chemical composition of the above steel should bein the narrow range of C 0.13-0.19％, Mn 24.5-27.0％ and Al 3.8-4.7％. Such a steelpossesses excellent ductility and impact properties together with higher strength ascompared with that of the conventional 18-8 austenitic stainless steels, although itsrustresisting property is relatively poor. The production of such steel calls for special attention, it is advised to stick to theso-called "3-high and 1-fast" practice, i. e. high smelting temperatures, high slag temper-atures and high mould temperatures with fast teeming. In hot working practice, it hasbeen found that there appeared two regions with high plasticity, 750-850℃ and 1150-1250℃. The 15Mn26Al4 steel has been successfuly fabricated into the sheets, plates, bars,wires, tubes and forgings. At the same time, suitable welding rods coated with properfluxes of different specifications have been developed. Explosion tests to failure at liquid nitrogen temperature of vessels made of 15Mn26Al4 steel were carried out, the broken vessel showed complete plastic dimple fracture,testifying that such a steel is suitable for low temperature uses.
|
|
Received: 18 March 1977
|
[1] 张彦生、师昌绪,金属学报,7(196们),285．
[2] 张彦生、师昌绪、李有柯,金属学报,8 (1965) ,346．
[3] Holden, H. et al., J. Iron Steel Inst., London, 209 (1971) , 721．0 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
