904L Fasteners with World Wide Shipping
Lightning Bolt is world renown in the exotic alloy fastener market.
One such alloy, 904L, is a non-stabilised low carbon high alloy
austenitic stainless steel. The addition of copper to this grade
gives it greatly improved resistance to strong reducing acids,
particularly sulphuric acid. It is also highly resistant to chloride
attack - both pitting / crevice corrosion and stress corrosion
This grade is non-magnetic in all conditions and has excellent
weldability and formability. The austenitic structure also gives
this grade excellent toughness, even down to cryogenic temperatures.
Due to its intrinsic anti-corrosive properties, 904L can be made
into bolts, nuts, washers, studs, socket head cap screws, as well as
a wide variety of other fasteners.
904L does have very substantial contents of the high cost
ingredients nickel and molybdenum. Many of the applications in which
this grade has previously performed well can now be fulfilled at
lower cost by duplex stainless steel 2205 (S31803 or S32205), so it
is used less commonly than in the past.
Although originally developed for its resistance to sulphuric acid
it also has a very high resistance to a wide range of environments.
A PRE of 35 indicates that the material has good resistance to warm
sea water and other high chloride environments. High nickel content
results in a much better resistance to stress corrosion cracking
than the standard austenitic grades. Copper adds resistance to
sulphuric and other reducing acids, particularly in the very
aggressive "mid concentration" range.
In most environments 904L has a corrosion performance intermediate
between the standard austenitic grade 316L and the very highly
alloyed 6% molybdenum and similar "super austenitic" grades. In
aggressive nitric acid 904L has less resistance than molybdenum-free
grades such as 304L and 310L. For maximum stress corrosion cracking
resistance in critical environments the steel should be solution
treated after cold work
Typical applications include:
Processing plant for sulphuric,
phosphoric and acetic acids
Pulp and paper processing
Components in gas scrubbing plants
Seawater cooling equipment
Oil refinery components
For More Information or to Place Orders
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place an order, please call (225) 272-6200 or send an email to
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