A fabrication and erection specification for stainless steel - DD ENV 1090 Part 6

Why does stainless steel need a fabrication and erection standard?

Stainless steel has different material and mechanical properties to carbon steel. For example:

  • it work hardens very rapidly,
  • the residual stresses arising from fabrication are higher,
  • special procedures are required to prevent contamination from carbon steel pick-up.

Furthermore, stainless steel is often used because of its attractive appearance, in which case an overriding objective is to protect the surface of a stainless steel component during fabrication and erection.
Because of these different properties and requirements, special fabrication practices are required.

 

DD ENV 1090, Part 1

In 1998, the European Standard Execution of steel structures, ENV 1090, Part 1 General rules and rules for buildings, was published by BSI as a DD (Draft for Development). It is a lengthy document dealing with all aspects of fabrication and erection of structural carbon steels.

DD ENV 1090, Part 6

In 2001, Part 6 of ENV 1090, which covers the fabrication and erection of structural stainless steel, was published by BSI.
The topics covered are:

  • materials
  • fabrication (including handling, storage, cutting, shaping, holing)
  • welding
  • mechanical fastening
  • erection
  • protective treatment
  • geometrical tolerances
  • inspection, testing and corrections

The standard covers austenitic and duplex stainless steels. It is applicable to structural components in buildings and other similar steel structures but excludes those that are susceptible to fatigue.
It should be noted that this specification is made up of concise, mandatory clauses; the inclusion of explanatory guidance and additional information was not permitted in this context. In addition. ENV 1090-6 is a supplement to ENV 1090-1, so it is necessary to refer back to ENV 1090-1 continuously.
Frequent references are made to BS EN 1011-3, the new European Standard for welding stainless steel. The standard covers weld consumables, weld details, weld backing, distortion, post-weld cleaning and quality requirements of welds.
All parts of ENV 1090 are now undergoing amendment and should be converted into a full European standard (EN) in a few years.

 

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