A regression equation for the Ar3 temperature for as cast ferrite/pearlite steels has been obtained. At these coarse grain sizes, very little influence of grain size on the Ar3 is observed. Out of all the elements examined, C, Mn and Nb had the major influence in decreasing the Ar3. A change in cooling rate from 10 to 200 K min−1 results in only a small decrease of around 20°C. Of particular interest is the very marked effect of Nb in reducing the Ar3, an addition of 0·03%Nb causing a decrease in the Ar3 of 50°C.
BannenbergerNBergmannBJungblutH‐AMullerNReichK: ‘Procedures for successful continuous casting of steel microalloyed with Nb, Ti, and N’, Proc. Conf. Microalloying ’95, Pittsburgh, PA, USA, June 1995, Iron and Steel Society, 83–94.
3.
ShigaCKamadaAHatomuraTHiroseKJunichiJSekineT: ‘Development of large diameter high service strength line – pipes for low temperature services’, Kawasaki Steel Technical Report 4, Kawasaki Steel, Tokyo, Japan, 1981, 97–109.
BlasJG.: ‘Influencia da composicao Quimica e da Velocidade de Resfriamento sobre o Ponto Ar3, em Acos de Baixo C Microligrados Ao Nb’, Proc. Cong. Annual da Associacao Brasiliera de Metals, Vol. 1, 11–29; 1989, Sao Paulo, ABM.
6.
TamuraISekineHTanakaTOuchiC: ‘Thermomechanical processing of high strength low alloy steels’, 245; 1988, London, Butterworths.
7.
ChoquetPLeBonAPerdixC: ‘Mathematical model for predictions of austenite and ferrite microstructures in hot rolling processes’, IRSID Report, IRSID, St Germain‐en‐Laye, France, 1985, 7.
8.
PickeringFB: ‘Steels metallurgical principles: encyclopaedia of materials science and engineering’, Vol. 6; 1986, Cambridge, MIT Press.
MintzBAbushoshaRComineliOGLoyala OlieveraM: ‘The influence of sulphides on the hot ductility of steels’, Proc. Conf. Thermec ’97, (ed. ChandraTSakaiT, ed), Vol. 1, 867–873; 1997, Warrendale, PA, The Minerals, Metals and Materials Society.
