Seamless Tubes 904L ASTM A312/ASME SA 312 , Length 5.0~5.8 meter
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
particularly sulphuric acid. It is also highly resistant to
chloride attack - both pitting /
crevice corrosion and stress corrosion cracking. 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. 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
904L Stainless Steel Pipes and Tubes Product Range
904L Stainless Steel Pipes and Tubes Specifications: ASTM A/ASME SA
269/677 904L Stainless Steel Pipes and Tubes Sizes
(Seamless): 1/2" NB - 8" NB
904L Stainless Steel Pipes and Tubes Sizes (ERW): 1/2" NB - 24" NB
904L Stainless Steel Pipes and Tubes Sizes (EFW): 6" NB - 100" NB
904L Stainless Steel Pipes and Tubes Wall Thickness available:
Schedule 5S - Schedule XXS (heavier on request)
904L Stainless Steel Pipes and Tubes Other Materials Testing:
NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc
These properties are specified for flat rolled product (plate,
sheet and coil) in ASTM B625. Similar but not necessarily identical
properties are specified for other products such as pipe, tube and
bar in their respective specifications
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 904LL and 310L.
For maximum stress corrosion cracking resistance in critical
environments the steel should be solution treated after cold work.
Good resistance to oxidation, but like other highly alloyed grades
suffers from structural instability (precipitation of brittle
phases such as sigma) at elevated temperatures. 904L should not be
used above about 400C.
Solution Treatment (Annealing) - heat to 1090-1175C and cool
rapidly. This grade cannot be hardened by thermal treatment. Welding
904L can be successfully welded by all standard methods. Care needs
to be taken as this grade solidifies fully austenitic, so is
susceptible to hot cracking, particularly in constrained weldments.
No pre-heat should be used and in most cases post weld heat
treatment is also not required. AS 1554.6 pre-qualifies Grade 904L
rods and electrodes for welding of 904L.
904L is a high purity, low sulphur grade, and as such will not
machine well. Despite this the grade can be machined using
Bending to a small radius is readily carried out. In most cases
this is performed cold. Subsequent annealing is generally not
required, although it should be considered if the fabrication is to
be used in an environment where severe stress corrosion
cracking conditions are anticipated.
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EXHIBITION AND CUSTORMER SATISFACTORY
APPLICATIONS FIELD :
Evaporators, Condensers, Driers
Muffler Tubes Hydraulic Tubing
Pharmaceuticals, Dairy, Food & Beverages
Machineries Process Piping
Paper & Pulp
Pump Casing Applications
Machineries Instrumentation Tubing