Elimination of reheat cracking

Reheat crack in 2.25CrMo repair weld


  • ½CrMoV main steam pipework and related components, welded with 2¼CrMo


  • Minimisation of the risk of reheat cracking, by identification of the controlling factors


  • Review of service experience
  • Inter-laboratory investigation of weld geometry, weld procedure and materials composition, including modelling and mechanical testing

Reheat crack in a 0.5CrMoV pipe welded with 2.25CrMo


  • Revised specification of residual element levels, especially for critical components
  • Redesign of weld geometries, especially terminal welds
  • Modifications to welding procedures, including revised specification of consumables


Brear, J.M.
“Weld life prediction – building on experience”
International VDI Conference ‘Alloys in Power Plant Technology’, Berlin 11-12 November 2014

Brear, J.M.
“Stress relief embrittlement - revisited”
ECCC Int Conf ‘Creep and Fracture in High Temperature Components – design and life assessment’ EMPA, Zurich, 21-23 April 2009

Batte, D.A., Brear, J.M., Holdsworth, S.R., Myers, J. and Reynolds, P.E.
“The effects of residual elements and deoxidation practice on the mechanical properties and stress relief cracking susceptibility of ½%CrMoV turbine castings”
Conf ‘Residuals, Additives and Materials Properties’, Royal Society, May 1978
Phil Trans R Soc, London, A295, 1980, pp.253-264

Plant Integrity