ÖNORM EN ISO 3506-2

This part of ISO 3506 specifies the mechanical properties of nuts made of austenitic, martensitic and ferritic grades of corrosion-resistant stainless steels when tested over an ambient temperature range of 15 C to 25 C. Proper-Ges will vary at higher or lower temperatures. It applies to nuts with nominal thread diameters (d) up to and including 39 mm; of triangular ISO metric threads with diameters (d) and pitches in accordance with ISO 68-1, ISO 261 and ISO 262; of any shape; with width across flats as specified in ISO 272; with nominal heights greater than or equal to 0,5 d. It does not apply to nuts requiring properties such as locking abilities; weldability. This patt of ISO 3506 does not define corrosion or Oxidation resistance in particular environments. The aim of this part of ISO 3506 is a classification into property classes of corrosion resistant stainless steel fasteners. Some materials tan be used at temperatures down to -200 C, some tan be used at temperatures up to +800 C in air. Information on the influence of temperature on mechanical proper-Ges is found in annex D. Corrosion and Oxidation performances and mechanical properties for use at elevated or sub-zero temperatures must be the subject of agreement between user and manufacturer in each particular case. Annex E Shows how the risk of intergranular corrosion at elevated temperatures depends on the carbon content. All austenitic stainless steel fasteners are normally non-magnetic in the annealed condition; after cold working, some magnetic properties may be evident (see annex F).