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904L Stainless Steel Seamless Pipes - China Suppliers, Factory Stock for Fast Delivery
Introduction
ASTM A240/A240M 904L/N08904 Stainless steel seamless pipes are the pinnacle of corrosion-resistant alloys, engineered to thrive in highly aggressive media such as sulfuric acid, chlorides, and seawater. With 19%-23% chromium, 23%-28% nickel, 4%-5% molybdenum, and 1%-2% copper, this super-austenitic stainless steel delivers unmatched resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), outperforming conventional 316/316L alloys.
Key Features
Extreme Corrosion Resistance
Exceptionally high PREN (≥37) ensures reliability in sulfuric acid, phosphoric acid, and chloride-rich environments (e.g., marine, desalination).
Acid Compatibility
Copper addition enhances resistance to reducing acids like sulfuric at all concentrations.
Robust Mechanical Properties
Tensile strength ≥490 MPa, yield strength ≥220 MPa, maintaining integrity under high-pressure flows.
Material Specification
Standard: ASTM A240/A240M
O.D: 1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)
W.T: SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Application:
- Chemical & Petrochemical Processing Equipment
- Sulfuric & Phosphoric Acid Plants
- Seawater & Desalination Systems
- Pharmaceutical & Food Processing
- Oil & Gas (Sour Service Applications)
- Pollution Control & Scrubber Systems
- Heat Exchangers & Condensers
End: Plain End, Beveled End, Threaded
Processing: Cut-to-length; Polishing.
Inspection:
- 100% PMI (Positive Material Identification) Tested
- EN 10204 3.1/3.2 Mill Test Certificate
- Third-Party Inspection Accepted (SGS, BV, TUV, etc.)
- Hydrostatic Testing & Ultrasonic Testing Available
- Intergranular Corrosion Test per ASTM A262
Delivery Condition: Cold Drawn, Annealed and Pickled/ Polished /Bright Annealed/ Sand blasting/ Shot Blasting.
Marking: All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per the customer’s request)
Packing: Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests
Specials: Sizes and Specifications other than above can be customized on request.
Specification Parameters
904L/N08904 Chemical Composition
| HEAT NO. | CHEMICAL COMPOSITION (%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | ||
| STAND. | MIN. | - | - | - | - | - | 23.00 | 19.00 | 4.00 | - | 1.00 |
| MAX. | 0.02 | 2.00 | 0.045 | 0.035 | 1.00 | 28.00 | 23.00 | 5.00 | 0.1 | 2.00 | |
904L/N08904 Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
|---|---|---|---|---|---|
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 90 | 187 |
Equivalent Grades - (ASTM B677 UNS N08904 (904L) Equivalent Grades)
| ISO | EN (Europe) | DIN (Germany) | JIS (Japan) | GB (China) | UNS (USA) | AISI/SAE |
|---|---|---|---|---|---|---|
| X1NiCrMoCu25-20-5 (ISO 15510) | 1.4539 (EN 10088-2) | X1NiCrMoCu25-20-5 (DIN 17440) | SUS 890L (JIS G3463) | 015Cr21Ni26Mo5Cu2 (GB/T 14976) | N08904 | 904L |
ASTM A312/A312M Standard Cold Machining Size Deviation Permitted
| Nominal Outside Diameter & Allowable Deviation | Nominal Wall Thickness & Allowable Deviation | ||||
|---|---|---|---|---|---|
| Inches | MM | Allowable Deviation | Inches | MM / Condition | Allowable Deviation (%) |
| 1/8" - 1 1/2" | (10.29 - 48.26) | +0.4 -0.8 | 1/8" - 1 1/2" | (10.29-73.03) all of t | +20 -12.5 |
| >1 1/2" - 4" | (48.26 - 114.3) | ±0.8 | 3" - 18" | (88.9-457.2) t/D=5% | +22.5 -12.5 |
| >4" - 8" | (114.3 - 219.08) | +1.6 -0.8 | 3" - 18" | (88.9-457.2) t/D>5% | +15 -12.5 |
| >8" - 18" | (219.08 - 457.2) | +2.4 -0.8 | ≥20" | =508 t of wld pipe | +17.5 -12.5 |
| >18" - 26" | (457.2 - 660.4) | +3.2 -0.8 | ≥20" | =508 t/D=5% | +22.5 -12.5 |
| >26" - 34" | (660.4 - 863.6) | +4.0 -0.8 | ≥20" | =508 t/D>5% | +15 -12.5 |
| >34" - 48" | (863.6 - 1219.2) | +4.8 -0.8 | - | - | - |
| Thin wall pipe (t/D=3%) ovality condition: Any cross section in a steel pipe Dmax Dmin=1.5% nominal, and (Dmax Dmin)/ 2 conforms to the stipulated diameter tolerance range. | |||||
Comparison Table Of American Standard Dimensions - (ANSI B36.19 & ANSI B36.10 refers to ASTM A312)
| OD DN | IN | OD MM | ANSI B36.19 | ANSI B36.10 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal diameter in inches | ||||||||||||||||||||
| 5s | 10s | Sched.40s | Sched.40 | Sched.80s | Sched.80 | 10 | 20 | 30 | Standard | |||||||||||
| mm | Kg/m | mm | Kg/m | mm | Kg/m | mm | mm | Kg/m | mm | mm | Kg/m | mm | Kg/m | mm | Kg/m | mm | Kg/m | |||
| 6 | 1/8" | 10.29 | - | - | 1.24 | 0.281 | 1.73 | 371 | 1.73 | 2.41 | 0.467 | 2.41 | - | - | - | - | - | - | 1.73 | 0.371 |
| 8 | 1/4" | 13.72 | - | - | 1.65 | 0.499 | 2.24 | 0.644 | 2 | 3.02 | 0.809 | 3.02 | - | - | - | - | - | - | 2.24 | 0.644 |
| 10 | 3/8" | 17.14 | - | - | 1.65 | 0.64 | 2.31 | 0.858 | 2.31 | 3.2 | 1.118 | 3.2 | - | - | - | - | - | - | 2.31 | 0.858 |
| 15 | 1/2" | 21.34 | 1.65 | 0.814 | 2.11 | 1.016 | 2.77 | 1.26 | 2.77 | 3.73 | 1.62 | 3.73 | - | - | - | - | - | - | 2.77 | 1.26 |
| 20 | 3/4" | 26.67 | 1.65 | 1.034 | 2.11 | 1.298 | 2.87 | 1.68 | 2.87 | 3.91 | 2.19 | 3.91 | - | - | - | - | - | - | 2.87 | 1.68 |
| 25 | 1" | 33.4 | 1.65 | 1.312 | 2.77 | 2.125 | 3.38 | 2.5 | 3.38 | 4.55 | 3.23 | 4.55 | - | - | - | - | - | - | 3.36 | 2.5 |
| 32 | 1 1/4" | 42.16 | 1.65 | 1.674 | 2.77 | 2.732 | 3.56 | 3.38 | 3.56 | 4.85 | 4.46 | 4.85 | - | - | - | - | - | - | 3.56 | 3.38 |
| 40 | 1 1/2" | 48.26 | 1.65 | 1.926 | 2.77 | 3.155 | 3.68 | 4.05 | 3.68 | 5.08 | 5.4 | 5.08 | - | - | - | - | - | - | 3.68 | 4.05 |
| 50 | 2" | 60.32 | 1.65 | 2.424 | 2.77 | 3.992 | 3.91 | 5.43 | 3.91 | 5.54 | 7.47 | 5.54 | - | - | - | - | - | - | 3.91 | 5.43 |
| 65 | 2 1/2" | 73.02 | 2.11 | 3.747 | 3.05 | 5.345 | 5.16 | 8.62 | 5.16 | 7.01 | 11.4 | 7.01 | - | - | - | - | - | - | 5.16 | 8.62 |
| 80 | 3" | 88.9 | 2.11 | 4.585 | 3.05 | 6.557 | 5.49 | 11.28 | 5.49 | 7.62 | 15.25 | 7.62 | - | - | - | - | - | - | 5.49 | 11.28 |
| 90 | 3 1/2" | 101.6 | 2.11 | 5.272 | 3.05 | 7.526 | 5.74 | 13.56 | 5.74 | 8.08 | 18.62 | 8.08 | - | - | - | - | - | - | 5.74 | 13.56 |
| 100 | 4" | 114.3 | 2.11 | 5.945 | 3.05 | 8.496 | 6.02 | 16.06 | 6.02 | 8.56 | 22.29 | 8.56 | - | - | - | - | - | - | 6.02 | 16.06 |
| 125 | 5" | 141.3 | 2.77 | 9.639 | 3.4 | 11.74 | 6.55 | 21.76 | 6.55 | 9.52 | 30.92 | 9.52 | - | - | - | - | - | - | 6.55 | 21.76 |
| 150 | 6" | 168.28 | 2.77 | 11.514 | 3.4 | 14.037 | 7.11 | 28.23 | 7.11 | 10.97 | 42.52 | 10.97 | - | - | - | - | - | - | 7.11 | 28.23 |
| 200 | 8" | 219.08 | 2.77 | 15.049 | 3.76 | 20.334 | 8.18 | 42.49 | 8.18 | 12.7 | 64.57 | 12.7 | - | - | 6.35 | 33.28 | 7.04 | 36.8 | 8.18 | 42.4 |
| 250 | 10" | 273.05 | 3.4 | 23.028 | 4.19 | 28.29 | 9.27 | 60.24 | 9.27 | 12.7 | 81.46 | 15.09 | - | - | 6.35 | 41.7 | 7.8 | 51 | 9.27 | 60.24 |
| 300 | 12" | 323.85 | 3.96 | 31.806 | 4.57 | 36.633 | 9.52 | 73.76 | 10.31 | 12.7 | 97.36 | 17.48 | - | - | 6.35 | 49.68 | 8.38 | 65.14 | 9.52 | 73.76 |
| 350 | 14" | 355.6 | 3.98 | 34.99 | 4.78 | 42.102 | 9.52 | - | 11.13 | - | - | 19.05 | 6.35 | 54.63 | 7.92 | 67.98 | 9.52 | 81.21 | 9.52 | 81.21 |
| 400 | 16" | 406.4 | 4.19 | 42.35 | 4.78 | 48.22 | 9.52 | - | 12.7 | - | - | 21.44 | 6.35 | 62.58 | 7.92 | 77.9 | 9.52 | 93.13 | 9.52 | 93.18 |
| 450 | 18" | 457.2 | 4.19 | 47.7 | 4.78 | 54.3 | 9.52 | - | 14.27 | - | - | 23.82 | 6.35 | 70.5 | 7.92 | 87.8 | 11.13 | 122.12 | 9.52 | 105.05 |
| 500 | 20" | 508 | 4.77 | 60.32 | 5.54 | 69.766 | 9.52 | - | 15.09 | - | - | 26.19 | 6.35 | 78.47 | 9.52 | 116.97 | 12.7 | 155 | 9.52 | 116.97 |
| 550 | 22" | 558.8 | 4.77 | - | 5.54 | - | 9.52 | - | - | - | - | 28.58 | 6.35 | 86.42 | 9.52 | 128.89 | 12.7 | 170.86 | 9.52 | 128.89 |
| 600 | 24" | 609.6 | 5.54 | 84.1 | 6.35 | 96.215 | 9.52 | - | 17.48 | - | - | 30.96 | 6.35 | 96.215 | 9.52 | 140.8 | 14.7 | 209.54 | 9.52 | 140.81 |
| 650 | 26" | 660.4 | - | - | - | - | 9.52 | - | - | - | - | - | 7.92 | 127.58 | 12.7 | 202.65 | - | - | 9.52 | 152.73 |
| 700 | 28" | 711.2 | - | - | - | - | 9.52 | - | - | - | - | - | 7.92 | 137.52 | 12.7 | 218.54 | 15.88 | 271.94 | 9.52 | 164.65 |
| 750 | 30" | 762 | 6.35 | 120.59 | 7.92 | 147.45 | 9.52 | - | - | - | - | - | 7.92 | 147.45 | 12.7 | 234.44 | 15.88 | 291.81 | 9.52 | 176.57 |
| 800 | 32" | 812 | - | - | - | - | 9.52 | - | 17.48 | - | - | - | 7.92 | 157.39 | 12.7 | 250.33 | 15.88 | 311.67 | 9.52 | 188.5 |
| 850 | 34" | 863.6 | - | - | - | - | 9.52 | - | 17.48 | - | - | - | 7.92 | 167.32 | 12.7 | 266.22 | 15.88 | 331.54 | 9.52 | 200.42 |
| 900 | 36" | 914.4 | - | - | - | - | 9.52 | - | 19.05 | - | - | - | 7.92 | 177.26 | 12.7 | 282.18 | 15.88 | 351.41 | 9.52 | 212.34 |
Frequently Asked Questions
What is the chemical composition standard for 904L/N08904 stainless steel?
According to ASTM standards, 904L (UNS N08904) contains 19.00%-23.00% Chromium, 23.00%-28.00% Nickel, 4.00%-5.00% Molybdenum, and 1.00%-2.00% Copper, with low carbon content (max 0.02%).
Why does 904L stainless steel have superior acid resistance?
The addition of 1% to 2% copper in its chemical composition significantly enhances 904L's resistance to strong reducing acids, especially sulfuric acid at various concentrations.
What are the mechanical properties of ASTM A240 904L pipes?
ASTM A240 904L seamless pipes exhibit a minimum tensile strength of 490 MPa, a minimum 0.2% yield strength of 220 MPa, minimum elongation of 35%, and a maximum hardness of 90 HRB (187 HB).
What equivalent global grades correspond to UNS N08904?
Equivalent grades include X1NiCrMoCu25-20-5 (ISO 15510 and DIN 17440), 1.4539 (EN 10088-2), SUS 890L (JIS G3463), and 015Cr21Ni26Mo5Cu2 (GB/T 14976).
What quality inspections are performed on these seamless pipes?
Standard inspections include 100% PMI testing, EN 10204 3.1/3.2 mill certification, hydrostatic testing, ultrasonic testing, and intergranular corrosion testing per ASTM A262. Third-party inspections (SGS, BV, TUV) are also accepted.
What are the primary applications of 904L stainless steel seamless pipes?
They are primarily used in chemical/petrochemical processing, sulfuric/phosphoric acid plants, seawater/desalination systems, pharmaceutical/food processing, oil and gas sour service, pollution control scrubbers, and heat exchangers.