BS EN ISO 3506-1:2009 Mechanical properties of corrosion-resistant stainless steel fasteners. Bolts, screws and studs
BS EN ISO 3506-1 specifies the mechanical properties of bolts, screws and studs made of austenitic, martensitic and ferritic steel grades of corrosion-resistant stainless steels, when tested over an ambient temperature range of 10 °C to 35 °C. Properties vary at higher or lower temperatures.
BS EN ISO 3506-1 applies to bolts, screws and studs
• With nominal thread diameter d u 39 mm,
• Of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and ISO 262, and
• Of any shape.
It does not apply to screws with special properties, such as weldability.
The designation system of this part of ISO 3506 can be used for sizes outside the limits given in this clause (e.g. d > 39 mm), provided that all applicable mechanical and physical requirements of the property classes are met.
This part of ISO 3506 does not define corrosion or oxidation resistance in particular environments. However, some information on materials for particular environments is given in Annex E. Regarding definitions of corrosion and corrosion resistance, see ISO 8044.
The aim of this part of ISO 3506 is the classification of corrosion-resistant stainless steel fasteners1) into property classes. Some materials can be used at temperatures down to − 200 °C, while some can be used at temperatures up to + 800 °C in air. Information on the influence of temperature on mechanical properties is found in Annex F.
Corrosion and oxidation performances and mechanical properties for use at elevated or sub-zero temperatures can be agreed on between the user and the manufacturer in each particular case. Annex G 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 can be evident (see Annex H).
Contents:
Foreword
Introduction
1 Scope
2 Normative references
3 Symbols
4 Designation, marking and finish
4.1 Designation
4.2 Marking
4.3 Finish
5 Chemical composition
6 Mechanical properties
7 Testing
7.1 Test programme
7.2 Test methods
Annex A (normative) External thread – Calculation of stress area
Annex B (informative) Description of the groups and grades of stainless steels
Annex C (informative) Stainless steel composition specifications
Annex D (informative) Stainless steels for cold heading and extruding
Annex E (informative) Austenitic stainless steels with particular resistance to chloride induced stress corrosion
Annex F (informative) Mechanical properties at elevated temperatures; application at low temperatures
Annex G (informative) Time-temperature diagram of intergranular corrosion in austenitic stainless steels, grade A2 (18/8 steels
Annex H (informative) Magnetic properties for austenitic stainless steels
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