In the last decade, the evolution and control of steelmaking practice have enabled drastic reductions to be made in the impurity content of low alloy steels (mainly S, P, 0, N and H) and the resulting superclean steel products have seen their in-service behaviour greatly improved. The following examples concerning CLI products are presented : 1 -The reduction of S content by a factor of more than ten and the control of 0 content have considerably reduced the Hydrogen Induced Cracking (HIC) sensitivity of the C-Mn steel grades for the storage of oil and gas in sour environments. 2 -Superclean Ni Cr Mo V steel grades for turbine rotors shafts have a very low sensitivity to lower nose temper embrittlement. 3 -Thick ( z 100 mm) plates or forgings in Mn Ni Mo steel m e used for nuclear pressure vessels welded by the electron beam process offer high toughness in fused areas when S + P are reduced to less than 30 ppm. 4 -Steel grades very close to pure iron have been developed to improve the performance of magnetic circuits in large accelerators.
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