904L Stainless Steel Pipe ASTM A213 ASME SA 213 UNS N08094 904L

904L Stainless Steel Pipe ASTM A213 ASME SA 213 UNS N08094 904L

ASTM A213 ASTM B677 N08904 904L Stainless Steel Tubing is a non-stabilised low carbon(0.02% max) high alloy austenitic stainless steel pipe, there is no carbon deposition in the case of general heat treatment and welding. Eliminates the risk of the corrosion of the crystals that occur after heat treatment and welding.. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid,Phosphoric Acid, Organic Acid, Inorganic Acid.. It is also highly resistant to chloride attack both pitting / crevice corrosion and stress corrosion cracking.

ASME SA213 904L N08904 Stainless steel tubing is designed for harsh environments of the corrosion conditions. Initially stainless steel is developed for corrosion resistance in sulfuric acid. This feature has been verified that is very successful after many years of practical application. Now, 904L in many countries have been standardized.

As the high chromium, nickel, molybdenum and copper content, 904L has excellent corrosion resistance. Such as the uniform corrosion, especially in dilute sulfuric acid.
904L Stainless Steel Other properties included:
- Good resistance to pitting and crevice corrosion ability
- High resistance to stress corrosion cracking capacity
- Good resistance to intergranular corrosion ability
- Good machinability and weldability

904L Tubing 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 temperature.

904L Stainless Steel Tubing 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.

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.

904L Pipe 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 Stainless Steel Tubing 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.

904L Stainless Steel Pipe 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 400°C.

904L Stainless Steel Tubing Heat Treatment

Solution Treatment (Annealing) - heat to 1090-1175°C and cool rapidly. This grade cannot be hardened by thermal treatment.

904L Stainless Steel Tubing 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 Stainless Steel Pipe 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.

904L Stainless Steel Tubing Applications

Typical application include:

· 904L Pipe in Processing plant for sulphuric, phosphoric and acetic acids

· 904L Pipe in Pulp and paper making processing

· 904L Stainless Steel Pipe in Components in gas scrubbing plants

· TP904L Stainless Steel Pipe in Seawater cooling equipment

· 904LTubing in Oil refinery components

· Wires in electrostatic precipitators

ASTM A213 904L N08904 1.4539 Stainless Steel Chemical Composition

ASTM A213 904L N08904 1.4539 Stainless Steel mechanical properties

ASTM A213 904L N08904 1.4539 Stainless Steel physical properties

ASTM A213 904L N08904 1.4539 Stainless Steel standard

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