904L / UNS N08904 Stainless Steel Seamless Pipe / Welded Stainless
Steel Tube Alloy 904L
904L Stainless Steel Pipe & Tube Specifications
| Specification | ASTM A312, A213, A249, A677 |
|---|
| Grade | 904L Stainless Steel |
|---|
| Finishes | Annealing Pickling, Bright Annealing |
|---|
| NPS | 1/8″ – 24″ |
|---|
| Sch | Sch5 – Sch160 |
|---|
| Shapes | Round, U Bend, Coil Shape |
|---|
| Application | Heat Exchanger, Boiler, Condenser, Cooler, Heater |
|---|
904L Stainless Steel Pipe | UNS N08904 Tube
904L stainless steel pipe is manufactured in a large range of sizes
including small diameter and large diameter dimensions, 904L
stainless steel tube can be both welded and seamless tube complying
with ASTM standards and ISO standards, ASTM A269 and A213 standard
specifications for seamless tubes, and ASTM A249 standard for
welded tubes.
904L stainless steel consists of chromium, nickel, molybdenum and
copper contents, these elements give type 904L stainless steel
excellent properties to resist corrosion in dilute sulfuric acid
because of the addition of copper, 904L commonly is used in
high-pressure and corrosion environments where 316L and 317L
perform poorly. UNS N08904 pipes are manufactured to resist
pitting, stress corrosion cracking, high strength, erosion
corrosion and corrosion fatigue, and crevice corrosion, DIN 1.4539
tube is EN standard steel tube grade.
904L Stainless Steel
904L has a high nickel composition with low carbon content, with
copper alloy added to improve its corrosion resistance, the “L” in
904L stands for low carbon, it is typical Super Austenitic
stainless steel, and equivalent grades are DIN 1.4539 and UNS
N08904, 904L has better properties than other austenitic stainless
steels.
904L Stainless Steel Chemical Composition (Max %):
| Grade | Ni | Cr | Mo | Cu | C | Mn | Si | P | S | Fe |
|---|
| 904L | 23 – 28 | 19 – 23 | 4 -5 | 1 – 2 | 0.02 | 2 | 1 | 0.045 | 0.035 | Balance |
904L Stainless Steel Mechanical Properties
| Grade | Tensile Strength, Min | Yield Strength, Min | Elognation | Hardness |
|---|
| 904L | 490 Mpa | 215 Mpa | 35% | 90 HRB Max |
904L Stainless Steel Physical Properties
| Grade | Density
(Kg/M3) | Elastic Modulus
(GPa) | Mean Co-Eff Of
Thermal Expansion
(Μm/M/°C) | Thermal Conductivity
(W/M.K) | Specific Heat 0-100°C
(J/Kg.K) | Elec Resistivity
(NΩ.M) |
|---|
| 0-100°C | 0-315°C | 0-538°C | At 20°C | At 500°C |
|---|
| 904L | 7900 | 190 | 15 | – | – | 11.5 | – | 500 | 952 |
904L Stainless Steel Pipe Sizes
| Nominal Pipe Size | Outside Diameter | Nominal Wall Thickness |
|---|
| SCH5S | SCH10S | SCH40S/STD | SCH80S |
|---|
| 1/8 | 10.3 | — | 1.24 | 1.73 | 2.41 |
| 1/4 | 13.7 | — | 1.65 | 2.24 | 3.02 |
| 3/8 | 17.1 | — | 1.65 | 2.31 | 3.20 |
| 1/2 | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 |
| 3/4 | 26.7 | 1.65 | 2.11 | 2.87 | 3.91 |
| 1 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 |
| 1 1/4 | 42.2 | 1.65 | 2.77 | 3.56 | 4.85 |
| 1 1/2 | 48.3 | 1.65 | 2.77 | 3.68 | 5.08 |
| 2 | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 |
| 2 1/2 | 73.0 | 2.11 | 3.05 | 5.16 | 7.01 |
| 3 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 |
| 3 1/2 | 101.6 | 2.11 | 3.05 | 5.74 | 8.08 |
| 4 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 |
| 5 | 141.3 | 2.77 | 3.40 | 6.55 | 9.53 |
| 6 | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 |
| 8 | 219.1 | 2.77 | 3.76 | 8.18 | 12.70 |
| 10 | 273.1 | 3.4 | 4.19 | 9.27 | 12.70 |
| 12 | 323.9 | 3.96 | 4.57 | 9.53 | 12.70 |
| 14 | 355.6 | 3.96 | 4.78 | 9.53 | — |
| 16 | 406.4 | 4.19 | 4.78 | 9.53 | — |
| 18 | 457.2 | 4.19 | 4.78 | 9.53 | — |
| 20 | 508.0 | 4.78 | 5.54 | 9.53 | — |
| 22 | 558.8 | 4.78 | 5.54 | 9.53 | — |
| 24 | 609.6 | 5.54 | 6.35 | 9.53 | — |
904L Stainless Steel Properties
- Excellent resistance to stress corrosion cracking due to the
presence of high amounts of nickel content.
- Pitting and crevice corrosion, intergranular corrosion resistance.
- Grade 904L is less resistant to nitric acid.
- Excellent formability, toughness and weldability, due to low carbon
composition, it can be welded using any standard method, 904L
cannot be hardened by heat treatment.
- Non-magnetic, 904L is Austenitic stainless steel, and 904L
possesses Austenitic structure properties.
- Heat Resistance, Grade 904L stainless steels offer good oxidation
resistance. However, the structural stability of this grade
collapses at high temperatures, particularly above 400°C.
- Heat Treatment, Grade 904L stainless steels can be solution
heat-treated at 1090 to 1175°C, followed by rapid cooling. Thermal
treatment is suitable for hardening these grades.
904L Stainless Steel Pipe Standards
- ASTM A 312 – seamless, welded, and heavily cold-worked austenitic
stainless steel pipes
- ASTM B 673 – uns n08904, uns n08925, and uns n08926 welded pipe
- ASTM B 677 – uns n08904, uns n08925, and uns n08926 seamless pipe
and tube
904L Stainless Steel Tube Standards
- ASTM A 213 – seamless ferritic and austenitic alloy-steel boiler,
super-heater, and heat-exchanger tubes
- ASTM A 249 – welded austenitic steel boiler, super-heater,
heat-exchanger, and condenser tubes
- ASTM A 269 – seamless and welded austenitic stainless steel tubing
for general service
- ASTM B 674 – uns n08904, uns n08925, and uns n08926 welded tube
- ASTM B 677 – uns n08904, uns n08925, and uns n08926 seamless pipe
and tube
904L Stainless Steel Applications
Because of the above properties, 904L stainless steel pipe can be
used in many applications, ranging from utility scrubber assemblies
to acid and fertilizer production equipment, pulp and paper
processing, and seawater cooling facilities. Used in processes
containing sulfuric or phosphoric acids, 904L displays its
excellent resistance to corrosion from those acids. The paper, gas,
pharmaceutical and chemical industries also use 904L for its
resistance and use to 400-450 degrees C. Alloy 904L tubing can be
welded, machined, heat-treated, annealed, hardened, and cold-worked
for many purposes.
- Petroleum and petrochemical equipment, for example: Reactor
- Storage and transportation equipment of sulphuric acid, for
example, heat exchanger
- Sea water treatment equipment, seawater heat exchanger
- Paper industry equipment, sulfuric acid, nitric acid equipment,
making acid, pharmaceutical industry
- Pressure vessel
- Food Equipment
