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Austenitically solidifying steels are prone to cracking during continuous casting and can possess poor hot workability. It has been suggested the problem is due to residual elements, particularly phosphorus. To investigate the effect of this element on hot ductility at strain rates typical of hot working and straightening on a curved mould continuous casting machine, a series of steels containing various levels of phosphorus have been produced as 50 kg sand castings. The steels chosen for the investigation were 2% SiMn, 9% Ni and Type 310 stainless, being typical of low and medium alloy and stainless steels which solidify austenitically. A marked deleterious effect of phosphorus was detected in SiMn steels at 0.046% P during fast strain rate testing but the ductility was also impaired to a lesser extent at 0.024% P. The effect was related to the presence of Fe(3)P (Fe(3) P/austenite eutectic) on grain boundaries. The ductility of the Type 310 stainless steels was also impaired by the addition of 0.043% P with the peak ductility being reduced to 1100 C, close to the melting point of the phosphide eutectic. This phase was not however detected in the Type 310 stainless steels. At lower temperatures, the Type 310 stainless steels exhibited a ductility trough centred on 1000 C.

Additional information

Authors: ALLAN G K, British Steel Corporation, London (GB)
Bibliographic Reference: EUR 12009 EN (1988) MF, 83 pp., ECU 4, blow-up copy ECU 11.25
Availability: (2)
ISBN: CD-NA-12009-EN-C
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