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The phase transformation points of a medium carbon V -Ti -N microalloyed steel were determined, as were the continuous cooling transformation curves of austenite heated at 1100°C without deformation and heated at 1200°C with two pass deformation. The data have been further used to analyse the real production scheme of N80 grade hot rolled non-quenched/tempered seamless tubes. The results have showed clearly that the commonly used 'in line normalisation' is not always necessary in the non-quenched/tempered production process of N80 grade hot rolled seamless oil well tubes. The above viewpoint has been further demonstrated by the microstructural examination of specimens sampled from industrial production.MST/5688

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