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Page count: 18

The construction of large petrochemical reactors working at elevated temperature in a hydrogen environment necessitates the use of 21⁄4Cr-1Mo (ASTM A 387, Grade 22, Class 2) steel with increasingly thicker plates. With this in mind, the aim of this paper is to present information on plates from 150 to 500 mm (6 to 20 in.) thick. After describing the production process, the following points are discussed: (1) reproducibility of analysis on different heats, (2) homogeneity of the composition and material properties in a heavy plate, (3) analysis of the development of the metallurgical properties in relation to the thickness and heat treatment, (4) examples of industrial production plates up to 500 mm (20 in.) thick, and (5) influence of low residual element contents with regard to resistance to temper embrittlement associated with long-duration service at elevated temperature.