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BS EN ISO 3506-1
Mechanical properties of corrosion-resistant stainless…
BS EN ISO 3506-1
Mechanical properties of corrosion-resistant stainless steel fasteners
Part 1: Bolts, screws and studs
Steel grade
A
for austenitic steel
A5
- Similar to A4, but stabilised.
Can thus be used in high temp. applications
A1
- Designed for machining
- Has higher sulphur content and therefore lower corrosion resistance
A4 or A4L
- "Acid proof steel"
- Molybdenum alloyed
- Has better corrosion resistance. Is to a certain extent suitable in an environment with chloride content.
A3
- Similar to A2, but stabilised.
Can thus be used in high temp. applications
A2 or A2L
- Most commonly used.
Not suitable for use in non-oxidizing acid and agents with chloride content
-L for low carbon steel
C
for martensitic steel
- can be hardened to an excellent strength
C1
- Have limited corrosion resistance
- Are used in turbines, pumps and knives
C3
- Have slightly better corrosion resistance than C1
- Used in pumps and valves
-
F
for ferritic steel
- Cannot normally be hardened and should not be even if possible in certain cases.
- Are magnetic
F1
- Are normally used for simpler equipment.
- F1 can, if need be, replace steels of grade A2 and A3 and be used in an environment with a higher chloride content
FA
May be included later
Are duplex steels. Have better properties than A4 and A5, especially concerning strength. Exhibit superior resistance to pitting and crack corrosion
-
Marking
- Manufacturer's identification mark
- Steel grade
- Property class
Fasteners that do not fulfill the tensile or torsional requirements because of the geometry may
be marked with the steel grade, but shall not be marked with the property class
Passivation
See ISO 16048
For maximum corrosion resistance, passivation is recommended. Fasteners may be marked with the symbol "P" after the symbols for steel grade and property class