DNV DNV-CP-0242 PDF

Scope and application

This programme is applicable for the approval of material manufacturers of:

— steel making and semi-finished products

as referred in the Society's rules and standards. For a description of general requirements, conditions and procedures related to the approval, see DNV-CP-0346 which shall be applied in combination with this programme.

This programme is applicable for the approval of manufacturers of steelmaking and semifinished products intended for further processing to products as indicated in Table 1 as given in DNV-RU-SHIP Pt.2, and relevant parts of other applicable DNV rules and standards.

The programme covers the process of manufacturing liquid steel, cast semi-finished products (i.e. concast slab, ingot) and partially hot-worked semi-finished products (i.e. blooms, bars etc.).

Approval is required for:

— each steel group (normal strength, higher strength, extra high strength etc.) or steel type (C and C-Mn, alloy, stainless etc.)

— each product type (ingots, slabs, blooms, billets etc.

— dimension/weight of semi-finished products (weight for ingots and dimensions for continuously cast products).

The product(s) used for approval testing (see Sec.3) will place limitations on the range of approval.

Approval will be limited to each steel grade, product type and processing route (steel making process, casting method etc.) used to produce approval test samples.

Approval for one grade of steel may also cover approval of lower strength or toughness grades without approval testing but based on approval principles as described in App.A. The following parameters are typical manufacturing variables in processing route:

— steelmaking process (BOC, EAF etc.) and secondary refining (LF, VD, VAD or VOD etc.)

— deoxidation

— casting method (CC or IC).

When relevant approval may be given for steel grades according to relevant international standards for which test scope shall be agreed with the Society on a case by case basis.