DNV DNV-CP-0351 PDF

Scope and application

This programme is applicable for approval of manufacturers for:

— heat treated products

— surface hardened products

as referred in the Society’s rules and standards. For a description of general requirements, conditions and procedures related to the approval, please refer to DNV-CP-0346 which shall be applied in combination with this programme. The corresponding class programmes for the specific products shall also apply. The approval will typically cover:

— an independent heat treatment company

— a manufacturer (e.g. foundry) in-house heat treatment facility

— a heat treatment sub-contractor

The corresponding requirements are given in App.B.

The programme is applicable for the approval of manufacturers for one or more of the heat treatments:

— normalizing or normalizing + tempering

— quenching1 and tempering

— solution heat treatment without quenching

— solution heat treatment with quenching1)

— tempering (e.g. malleable cast iron)

— stress relieving heat treatment

— soft annealing (spheroidize annealing)

— recrystallization annealing

— diffusion annealing/homogenizing annealing

— coarse grain annealing

— precipitation hardening

— case hardening

— nitriding

— induction hardening.

Some heat treatment processes may qualify other processes as indicated in App.A. Note that for any other process to be qualified in addition to the tested one, the heat treatment documentation and specifications, see Sec.2, shall be submitted and accepted by the Society.

Guidance note:

Other processes than those listed may be approved subject to case-by-case consideration. Adjusted scope of documentation and testing may be required as relevant.

Surface hardening by mechanical process such as shot peening is not covered by this approval programme.

1 Approval is limited to quenching media and quenching method.