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

Corrosion Resistance

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.
Heat Resistance
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.
Heat Treatment
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.
Fabrication
904L is a high purity, low sulphur grade, and as such will not machine well. Despite this the grade can be machined using
standard techniques.
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.

Typical compositional ranges for grade 904L stainless steels are given below:

904L Stainless Steel Pipe and Tubes Composition
Typical compositional ranges for grade 904l stainless steels are given below:


904L Stainless Steel Pipe and Tubes  Physical Properties
Typical Physical properties for grade 904L stainless steels  in the Annealing condition are given below:


904L Stainless Steel Pipe and Tubes Grade Specification
Approximate grade comparisons for 904L stainless steels are given

PACKING:

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Tag: ss seamless pipe, ss seamless tube, ss seamless tubing