Elements of choice

In addition to paragraph 4 of the file on creep-resistant steels, figure 1 shows an abacus outlining the limits of the fields of use of various classes of standardized steels whose characteristics are given in and :

• the upper limits correspond to creep failure in 10,000 hours ;

• lower limits correspond to creep elongation of 1% in 100,000 hours (or, in some cases, creep failure in 200,000 hours).

Some curves correspond to standardized grades with performances...