Rolled austenitic and ferritic-austenitic stainless steel products
|Publication Date:||1 May 2016|
Scope and application
This programme is applicable for the approval of material manufacturers of:
Rolled austenitic and ferritic-austenitic steel 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 DNVGL CP 0346 which shall be applied in combination with this programme.
This AoM programme is applicable for the approval of manufacturers of products indicated in Table 1 as given in RU SHIP Pt.2 Ch.2 and relevant parts of other applicable DNV GL rules and standards.
The product(s) used for approval testing (see Sec.3) will place limitations on the range of approval. The approval will be limited to:
each steel grade listed below
each product category, see Table 1
each kind of product form (plates, strips/coil, sections, bars etc.)
particular processing route and manufacturing variables
maximum tested thickness or diameter.
Approval of one product form will not cover other product forms (example: round/flat bars will not cover sections). However, approval for one grade of steel may also cover approval other grades, i.e. without additional approval testing. This is based on certain approval principles as given in App.A.
Approval is given to the following typical product categories, steel types and processing routes:
rolled stainless steels for structural and low temperature service
stainless steel strips/coil
rolled round bars
steelmaking process and secondary refining
casting method (CC, IC etc.)
dimensions of starting material
condition of supply (solution heat treated condition).
When applicable, approval will be given for the following additional conditions:
austenitic and duplex stainless steel grades for low temperature applications
rolled round bars not intended for structural application, e.g. intended for machinery components (as a substitute for forged bars). For these products the requirements for reduction ratio, sampling, acceptance criteria for mechanical properties and visual inspection and NDT shall comply with RU SHIP Pt.2 Ch.2 Sec.6 Steel forgings, as relevant. Approval test scope is given in this approval programme
where approval is applied for steel grades specified according to other relevant international standards, approval and test scope shall be agreed with the Society on case-by-case basis Starting material /semi-finished steel products shall be produced at works approved by the Society:
when steel rolling mill operates their own steel making and produce their semi-finished steel products (slabs/ingots/etc.),
when raw materials for steel rolling mill (slabs/ingots/etc.) are not produced at the rolling mill, semifinished steel products shall be procured from DNVGL approved steelmakers.
The manufacturer's own heat treatment facilities shall be evaluated and approved by the Society, either under this approval programme, or as an approved "heat-treatment workshop" based on the approval programme DNVGL CP 0351.
Where heat treatment is performed by a sub supplier, the sub supplier shall be approved by the Society as "heat-treatment workshop" in accordance with DNVGL CP 0351.
Manufacturers and works carrying out decoiling of strip and coiled products are not covered by this programme, but need separate approval according to DNVGL CP 0349 Decoiling workshop.