The effect of the characteristics of plate mills for production of plate and U-O-E pipe, and of continuous mills for production of strip and spiral pipe, is discussed in relation to ferrite-pearlite and two-phase steels. The influence of the cold work applied during pipemaking and expansion on the behaviour of each type of steel is considered, and the role of microalloying elements, individually and in combination, is discussed. The structure and properties achievable in normalized steel for pipe fittings are reviewed, and the effect of microalloys on weld properties is summarized.
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