USA Piping Solution is a leading manufacturer and supplier of Stainless Steel 904L Tubes for industry applications that require a product to endure extremely corrosive environments, purities and performance. SS 904L (UNS N08904, W.Nr. 1.4539, EN X1NiCrMoCu25-20-5) is a high-alloy super-austenitic stainless steel distinguished by its elevated chromium (19-23%), nickel (23-28%), molybdenum (4-5%), and copper (1-2%) content. This exceptional chemistry results in outstanding resistance to pitting, crevice corrosion, stress corrosion cracking, and to reducing acid environment, especially in dilute sulfuric acid. The low carbon level (max 0.02%) eliminates sensitization risk during welding. We offer all ASTM B673, ASTM B677, ASME SB673 and ASME SB677 Stainless Steel 904L Seamless Tubes, Stainless Steel 904L Welded Tubes, ERW, EFW and fabricated, all with full mill certifications.
SS 904L Tube Specifications
Parameter | Details |
|---|---|
Grade | SS 904L, UNS N08904, W.Nr. 1.4539, EN X1NiCrMoCu25-20-5, JIS SUS 904L, BS 904S13 |
Standards (Tubes) | ASTM B677 / ASME SB677 (Seamless and Welded Tubing) |
Standards (Pipes) | ASTM B673 / ASME SB673 (Welded Pipes); A312, A213, A249, A269 also applicable |
OD Range (Seamless) | 1/2 NB to 16 NB |
OD Range (Welded / ERW) | 1/2 NB to 24 NB |
OD Range (EFW) | 6 NB to 100 NB |
Schedule | SCH5, SCH10, SCH20, SCH40, STD, SCH80, XS, SCH120, SCH160, XXS |
Wall Thickness | 0.010 in (0.25 mm) to 0.375 in (9.5 mm) for tubing; heavier for pipes |
Form | Round, Square, Rectangular, Hydraulic |
Length | Single Random, Double Random, Cut to Length |
End | Plain End, Beveled End, Threaded |
Certification | EN 10204 3.1 / 3.2; SGS, TUV, DNV, ABS, LLOYDS |
Types of Stainless Steel 904L Tubes
904L Stainless Steel Tube sizes
904L Stainless Steel Seamless Tubing | |
|---|---|
Size | 1/2” OD - 12” OD |
OD | 3.00 - 219.10 mm |
Thickness | 0.40 - 12.70 mm |
Length | Single, Double Random & Cut Length |
TP 904L Erw / Welded Tubing | |
|---|---|
Size | 1/2” - 12” OD, Guage: 25 SWG - 10 SWG |
OD | 6.35 to 114.3 mm O.D |
Thickness | 0.8 - 12.7 mm |
Length | up to 26 Meters |
SS 904L Chemical Composition
Element | Symbol | Content (% by weight) |
|---|---|---|
Carbon | C | max 0.02 |
Chromium | Cr | 19.0 to 23.0 |
Nickel | Ni | 23.0 to 28.0 |
Molybdenum | Mo | 4.0 to 5.0 |
Copper | Cu | 1.0 to 2.0 |
Manganese | Mn | max 2.0 |
Silicon | Si | max 1.0 |
Phosphorus | P | max 0.045 |
Sulfur | S | max 0.035 |
Iron | Fe | Balance |
SS 904L Mechanical Properties
Property | Value |
|---|---|
Tensile Strength (min) | 490 MPa (71 ksi) |
Yield Strength 0.2% offset (min) | 220 MPa (32 ksi) |
Elongation in 50 mm (min) | 36% |
Hardness (Rockwell B) | 70 to 90 typical |
Hardness (Brinell) | 150 HB typical |
Modulus of Elasticity | 200 GPa (29,000 ksi) |
SS 904L Physical Properties
Property | Value |
|---|---|
Density | 8000 kg/m3 |
Thermal Expansion (0-100 C) | 15.0 mm/m/C |
Thermal Conductivity at 100 C | 13.0 W/m.K |
Specific Heat (0-100 C) | 500 J/kg.K |
Electrical Resistivity | 850 nOhm.m |
Magnetic Permeability | Non-magnetic |
International Equivalent Grades for SS 904L
Standard | UNS | W.Nr. | AFNOR | EN | JIS | BS | KS |
|---|---|---|---|---|---|---|---|
SS 904L | N08904 | 1.4539 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 | SUS 904L | 904S13 | STS 317J5L |
Source SS 904L Tubes from USA Piping Solution | Complete Certifications | Enquire Now
Enquire NowManufacturing Standards for SS 904L Tubes
ASTM / ASME Standard | Description |
|---|---|
ASTM B677 / ASME SB677 | Seamless and Welded 904L Tubes (primary tubing standard) |
ASTM A213 TP904L / SA213 | Seamless and Welded Austenitic Stainless Steel Tubing |
ASTM A249 TP904L / SA249 | Welded Austenitic Steel Boiler, Superheater, Condenser and Heat Exchanger Tubes |
ASTM A269 TP904L / SA269 | Seamless and Welded Austenitic Stainless Steel 904L Tubing |
ASTM A511 TP904L / SA511 | Stainless Steel 904L Seamless Mechanical Tubing |
ASTM A554 TP904L / SA554 | Welded Stainless Steel Mechanical Tubing |
ASTM A632 TP904L / SA632 | Small-Diameter Seamless and Welded Austenitic 904L Tubing |
ASTM A688 TP904L / SA688 | Welded Austenitic 904L Feedwater Heater Tubes |
Applications of SS 904L Tubes
- Chemical process industry: sulfuric acid and phosphoric acid plants
- Seawater desalination and offshore marine applications
- Oil and gas production: sour service pipelines
- Pharmaceutical and food processing plants
- Pulp and paper bleaching equipment
- Power generation heat exchangers and condensers
- Pollution control scrubber systems
- Fertilizer manufacturing plants
- Petrochemical refineries and ethylene plants
Related Products
- SS 904L Seamless Tubes
- SS 904L Welded Tubes
- SS 904L Pipes & Tubes
- SS 904L Plates
- SS 904L Flanges
- SS 430 Tubes
- SS 431 Tubes
- SMO 254 Pipes & Tubes
- Alloy 28 Pipes & Tubes
- S32750 Pipes & Tubes
Frequently Asked Questions
How does SS 904L tubing compare to SS 316L in a sulfuric acid plant absorber operating at 70 degrees C with 10% H2SO4 concentration?
At 10% H2SO4 at 70 C, SS 904L significantly outperforms SS 316L. The molybdenum and copper content in 904L provide active resistance in this concentration and temperature range, where 316L corrodes rapidly. SS 904L is the standard industry choice for this service.
We are specifying SS 904L tubes for a heat exchanger in a mixed acid environment. What is the PREN value of SS 904L and does it satisfy the minimum 40 threshold for our specification?
The PREN (Pitting Resistance Equivalent Number) of SS 904L is typically around 34 to 36 (PREN = %Cr + 3.3x%Mo + 16x%N). It approaches but does not always exceed the 40 threshold. For stricter pitting resistance above PREN 40, SMO 254 or 6Mo grades should be considered.
Our project QC plan requires NACE MR0175 / ISO 15156 compliant SS 904L tubing for a sour gas gathering system. Can you supply with the necessary compliance documentation?
Yes. SS 904L tubing with NACE MR0175 compliance certification is available. The alloy meets NACE MR0175 requirements for sour service in austenitic grades. We provide material certification and NACE conformance statements with each shipment.
Does SS 904L tubing require post-weld heat treatment after site welding? Our construction team needs a clear answer before finalizing the welding procedure specification.
SS 904L with its max 0.02% carbon content does not typically require post-weld heat treatment to avoid sensitization. However, for critical process duty, a solution anneal after welding is advisable. We can provide a recommended WPS and sample PWHT procedure on request.
We are buying SS 904L tubes for a pharmaceutical plant clean-in-place circuit. Can you supply electropolished
inner bore tubes with Ra less than 0.5 micrometres and PED compliance?
Yes. Electropolished SS 904L tubes with inner Ra below 0.5 micrometres for pharmaceutical CIP circuits are available. PED (Pressure Equipment Directive) compliance with CE-marked material and EN 10204 3.1 MTR can be supplied. Please provide your system design pressure.
SS 904L Tubes for Acid, Marine, and Pharmaceutical Service
Seamless and welded forms in stock. NACE MR0175, ASTM B677, PED-compliant options available. Electropolish, IGC test, and EN 10204 3.1 or 3.2 certification on request. Enquire now.
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