Steels_ Metallurgy and Applications, Third Edition

Table 3.20 UK turbine bolting steels

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SES" CEGB BS 1506: 1986 Nominal composition (9%) Typical heat RT tensile Strength

Trade name Code Type no. treatment strength

C Cr Mo V Others (N/rnmz) Rupt. Reha?

cdcd

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DUREHETE900 GP 1 (Cr-Mo) 631-850 0.4^1 0.5 - - 870°C OQ+WC 850-1000 234 97 81 -

DUREHETE 950 GP 2 671-850 0.4 1 0.5 0.25 - 950°C OQ+7WC 850-1000 324 151 83 -

• (Cr-Mo-V)
  GP 3 - 0.3 3 0.5 0.75 - - - - -
  (3Cr-Mo-V)


• GP 4 (Mo-V) - 0.2 - 0.5 0.25 - - - - -
  DUREHETE 1050 GP 5 - 0.2 1 1 0.75 - Superseded by Durehete 1055
  (1Cr-Mo-V)

(1Cr-Mo-V)

%ES, Stocksbridge Engineering Steels.
bStress relaxation for 0.15% strain.
h values (N/mz) at 500'C.
dlo4 h values (N/mz) at 550'C.
After Everson et a[.@

DWHETE 1050 GP 6 681-820 0.2 1 1 0.75 Ti, B 980°C OQ+7Oo"C 820-1000 418 280 141 70