904L Stainless Steel Pipe

Austenitic stainless steel grade 904L is designed to achieve moderate to high corrosion resistance. This is due to the high amount of molybdenum, chromium and nickel content. The resistance properties of grade 904L stainless steel pipes include good resistance to stress corrosion cracking, and pitting and crevice corrosion, as well as inter granular corrosion. The “L” in 904L stands for low carbon, i.e., only 0.03 percent or less. Grade 904L is also non-magnetic in all conditions, and has excellent machinability and weldability. Moreover, the austenitic structure gives it excellent toughness, even at cryogenic temperatures.

904L Stainless Steel Pipe Properties

The following sections describe the properties of 904L stainless grade pipes supplied by Arch City Steel & Alloy:

Corrosion Resistance:

  • Excellent resistance to warm seawater and chloride attack. The high resistance against stress corrosion cracking is due to the presence of high amounts of nickel in its composition.

  • The addition of copper to grade 904L develops resistance to reducing agents including sulfuric acid in both aggressive and mild conditions.

  • Less resistant to nitric acid than grades 304L and 310L, which are free of molybdenum.
  • Should to be solution treated after cold working, for achieving maximum resistance to stress corrosion cracking in adverse environments.

Heat Resistance:

  • Grade 904L stainless steel pipes offer good oxidation resistance.

  • Its structural stability diminishes at high temperatures, especially above 400°C.

Heat Treatment:

  • Grade 904L stainless steel pipes can be heat-treated at 1090 to 1175°C, following by rapid cooling.

  • Thermal treatment is suitable for hardening these grades.

Weldability:

  • Welding can be performed using all conventional methods.

  • Grade 904L pipes do not require pre-heating and post-weld heat treatments.

  • These pipes can be subjected to hot cracking in constrained weldments.

  • Electrodes and rods of 904L stainless steel grade are used for welding steel pipes and other products of grade 904L.

Machinability:

  • Grade 904L steel pipes can be machined using any standard method.

  • This grade can be bent to a small radius in cold environments.

  • Subsequent annealing is not required mostly. However, annealing is recommended when the fabrication is executed under severe stress corrosion cracking environments.

Applications:

Due to the different kinds of elements, 904L is designed for harsh industrial environments. Typical applications are shown as below:

  • Wiring in electrostatic precipitators

  • Oil refinery components

  • Gas scrubbing plants

  • Pulp and paper processing industry

  • Seawater cooling equipment

  • Chemical processing industry

  • Acetic, phosphoric, and sulfuric acid processing plants

 

CHEMICAL PROPERTIES:

Typical Chemical Composition % (max values, unless noted)
Grade Cr Ni C Si Mn P S Mo Cu Fe
904L min: 19
max: 23
min: 23
max: 28
0.02 Max 1.0 max 2.0 max 0.045 max 0.035 max min: 4
max: 5
min: 1
max: 2
balance

 

MECHANICAL PROPERTIES:

Typical Room Temperature Mechanical Properties
Grade

Tensile Strength

KSI (min.)

Yield Strength 0.2% Offset KSI (min.) Elongation % in 2ʺ(50.8 mm) Hardness
(Brinell) MAX
Hardness
(Rockwell B) MAX
904L 71 31 35 70-90 150

Arch City Steel & Alloy is a prominent distributor of stainless steel pipes and tubes in the USA. We can provide stainless steel pipes for your project as per required specifications, sizes and dimensions. You can inquiry for the 904L Stainless Steel Pipe product.