Womic Stainless Steel Co., Ltd
Womic Steel Group is a premier manufacturer and global exporter with over 20 years of expertise in producing carbon, alloy, and stainless steel tubular products. Our state-of-the-art seamless pipe production facility specializes in high alloy super austenitic stainless steel pipes, including 904L, 254 SMO, and other high performance alloys.
Production Size Range for ASTM B677 904L Seamless Pipe: Outside diameter from 10.3mm to 610mm (1/8 inch to 24 inch) with wall thickness from 1.0mm to 30.0mm. Single random lengths of 6m, double random lengths of 12m, or custom lengths up to 18m as required.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified: Quality management system ensuring consistent product quality across all operations.
ASTM B677 / EN 10216‑5 Compliance: Full compliance with ASTM B677 (Standard Specification for Seamless Austenitic Stainless Steel Pipe for High‑Temperature Service) and EN 10216‑5 for European market.
PED 2014/68/EU (CE Marking): Compliance with European Pressure Equipment Directive. CE marking and Declaration of Performance (DoP) available upon request.
NACE MR0175 / ISO 15156: 904L is approved for sour service only under strict limitations (low H₂S, low chlorides, <60°C) – please consult for your specific conditions.
EN 10204 3.2 Certification: Inspection Certificate 3.2 validated by TÜV, LR, BV, or SGS for critical applications requiring full material traceability.
Third-Party Inspection (TPI) Approvals: Products and processes approved by SGS, BV, ABS, LR, DNV, GL, and TÜV.
Global Recognition: Womic Steel is a trusted supplier to chemical plants, fertilizer producers, acid handling facilities, and offshore platforms, serving over 80 countries worldwide.
ASTM B677 904L is a super austenitic stainless steel specifically designed for applications where conventional austenitic steels (304/316L) fail due to insufficient corrosion resistance in aggressive acid environments or high chloride conditions. The “904L” designation indicates high nickel (23-28%), high chromium (19-23%), molybdenum (4-5%) and the addition of copper (1-2%). The copper content is critical for resistance to sulfuric acid.
Compared to 316L (PREN 24-26), 904L has a PREN (Pitting Resistance Equivalent Number) of approximately 34, meaning it has significantly better resistance to pitting and crevice corrosion. It also offers superior resistance to reducing acids such as sulfuric, phosphoric, formic, and acetic acid. The high nickel content provides excellent resistance to chloride stress corrosion cracking (SCC) and good stability at elevated temperatures.
ASTM B677 904L Stainless Steel Chemical Composition (Ladle Analysis, % by mass):
|
Element |
UNS N08904 (904L) Requirement |
|
Carbon (C) |
≤ 0.020 |
|
Manganese (Mn) |
≤ 2.00 |
|
Phosphorus (P) |
≤ 0.040 |
|
Sulfur (S) |
≤ 0.030 |
|
Silicon (Si) |
≤ 1.00 |
|
Chromium (Cr) |
19.0 – 23.0 |
|
Nickel (Ni) |
23.0 – 28.0 |
|
Molybdenum (Mo) |
4.0 – 5.0 |
|
Copper (Cu) |
1.0 – 2.0 |
|
Iron (Fe) |
Balance |
*Note: The combination of high molybdenum (4-5%) and copper (1-2%) gives 904L its unique resistance to sulfuric and phosphoric acids. The low carbon content (≤0.02%) prevents intergranular corrosion after welding.*
ASTM B677 904L Stainless Steel Mechanical Properties (Room Temperature):
|
Property |
904L Requirement |
|
Yield Strength (min, 0.2% offset) |
220 MPa (31,900 psi) |
|
Tensile Strength (min) |
490 MPa (71,000 psi) |
|
Elongation (min, 2″ gauge) |
35% |
|
Hardness (max) |
90 HRB / 200 HV |
ASTM B677 904L Stainless Steel Physical Properties:
|
Property |
Value |
|
Density |
8.0 g/cm³ (0.289 lb/in³) |
|
Melting Point |
1350-1400°C (2460-2550°F) |
|
Modulus of Elasticity |
195 GPa (28.3 × 10⁶ psi) |
|
Thermal Conductivity (100°C) |
12.0 – 14.0 W/m·K |
|
Specific Heat (20°C) |
450 J/kg·K |
|
Electrical Resistivity |
80 μΩ·cm |
|
Coefficient of Thermal Expansion (20-200°C) |
15.0 μm/m·K |
Corrosion Resistance – Key Properties:
|
Environment |
Resistance Level |
|
Sulfuric acid (H₂SO₄) 0-80% concentration, ≤60°C |
Excellent – copper addition critical |
|
Phosphoric acid (H₃PO₄) all concentrations |
Excellent |
|
Acetic acid (CH₃COOH) any concentration |
Excellent |
|
Formic acid (HCOOH) any concentration |
Excellent |
|
Seawater (high chlorides) |
Good – PREN 34, CPT ~60-70°C |
|
Hydrochloric acid (HCl, dilute) |
Moderate – limited to low concentrations (<5%) |
Limitations: 904L is not recommended for hot (>80°C) concentrated sulfuric acid (>90%) or high temperature hydrochloric acid service. For those, consider nickel alloys such as Alloy C‑276.
Comparison with Other Grades:
|
Grade |
PREN |
Yield Strength (MPa) |
Relative Cost |
Best Service |
|
316L |
24-26 |
170 |
1.0 |
General, mild acids |
|
904L |
34 |
220 |
2.5-3.0 |
Sulfuric/phosphoric acid, high chlorides |
|
254 SMO (S31254) |
43 |
300 |
3.5 |
Seawater, high chlorides |
|
Alloy 825 |
30-35 |
240 |
4.0 |
Sour service, reducing acids |
|
Alloy 625 |
45+ |
380 |
5.0+ |
Extreme corrosion & high temp |
Womic Steel supplies ASTM B677 904L seamless pipes across a wide dimensional spectrum, fully compliant with ASTM B677 / B677M and EN 10216‑5 standards.
|
Item |
Specification |
|
Standard |
ASTM B677 / B677M, EN 10216‑5, ASME SB‑677 |
|
Grade |
UNS N08904 (904L), Werkstoff 1.4539, SUS 904L |
|
Manufacturing Process |
Seamless – Cold Drawn / Cold Rolled / Extrusion |
|
Outside Diameter Range |
10.3mm – 610mm (1/8″ – 24″) |
|
Wall Thickness Range |
1.0mm – 30.0mm (0.039″ – 1.181″) |
|
Length |
6m (SR), 12m (DR), or custom lengths up to 18m |
|
Delivery Condition |
Solution Annealed (1040-1100°C) + Water Quenched / Pickled |
|
End Finish |
Plain End (PE) / Beveled End (BE) / Threaded & Coupled |
|
Surface Finish |
Annealed & Pickled / Bright Annealed (BA) / Polished |
|
Special Tests |
PMI (XRF), Intergranular Corrosion (ASTM A262 Practice E), Ferrite measurement |
Dimensional Tolerances per ASTM B677:
|
Characteristic |
Tolerance |
|
Outside Diameter (OD) for D < 25mm |
±0.13mm (±0.005″) |
|
Outside Diameter (OD) for D 25-50mm |
±0.25mm (±0.010″) |
|
Outside Diameter (OD) for D 50-100mm |
±0.38mm (±0.015″) |
|
Outside Diameter (OD) for D > 100mm |
±1.0% |
|
Wall Thickness (WT) |
±12.5% for WT > 1.65mm |
|
Length (mill length) |
+50mm, -0mm |
Standard Sizes (inches to mm conversion):
|
NPS (in) |
OD (mm) |
Schedule 10S (mm) |
Schedule 40S (mm) |
Schedule 80S (mm) |
|
1/2″ |
21.34 |
2.11 |
2.77 |
3.73 |
|
3/4″ |
26.67 |
2.11 |
2.87 |
3.91 |
|
1″ |
33.40 |
2.77 |
3.38 |
4.55 |
|
1-1/2″ |
48.26 |
2.77 |
3.68 |
5.08 |
|
2″ |
60.33 |
2.77 |
3.91 |
5.54 |
|
3″ |
88.90 |
3.05 |
5.49 |
7.62 |
|
4″ |
114.30 |
3.05 |
6.02 |
8.56 |
|
6″ |
168.28 |
3.40 |
7.11 |
10.97 |
|
8″ |
219.08 |
3.76 |
8.18 |
12.70 |
|
10″ |
273.05 |
4.19 |
9.27 |
15.09 |
|
12″ |
323.85 |
4.57 |
10.31 |
17.48 |
Outside Diameter:6mm – 1219mm (1/4" – 48")
Wall Thickness:0.5mm – 50mm (SCH 5S – SCH XXS)
Length:Up to 12m(fixed or random)
Tolerances:According to ASTM A999 / EN ISO 1127
|
ANSI B 36.19/ANSI B36.10 DIMENSIONS OF SEAMLESS &WELDED STAINLESS STEEL PIPE |
|||||||||||||||||||
|
公称尺寸 |
外径 |
ANSIB36.19 |
ANSIB36.10ANSIB36.10 |
||||||||||||||||
|
DN |
NPS |
mm |
5S |
10S |
40S |
80S |
10 |
20 |
30 |
STD |
40 |
60 |
XS |
80 |
100 |
120 |
140 |
160XXS |
|
|
6 |
1/8" |
10.29 |
|
1.24 |
1.73 |
2.41 |
|
|
|
1.73 |
1.73 |
|
2.41 |
2.41 |
|
|
|
|
|
|
8 |
1/4" |
13.72 |
|
1.65 |
2.24 |
3.02 |
|
|
|
2.24 |
2.24 |
|
3.02 |
3.02 |
|
|
|
|
|
|
10 |
3/8" |
17.15 |
|
1.65 |
2.31 |
3.20 |
|
|
|
2.31 |
2.31 |
|
3.20 |
3.20 |
|
|
|
|
|
|
15 |
1/2" |
21.34 |
1.65 |
2.11 |
2.77 |
3.73 |
|
|
|
2.77 |
2.77 |
|
3.73 |
3.73 |
|
|
|
4.78 |
7.47 |
|
20 |
3/4" |
26.67 |
1.65 |
2.11 |
2.87 |
3.91 |
|
|
|
2.87 |
2.87 |
|
3.91 |
3.91 |
|
|
|
5.56 |
7.82 |
|
25 |
1" |
33.4 |
1.65 |
2.77 |
3.38 |
4.55 |
|
|
|
3.38 |
3.38 |
|
4.55 |
4.55 |
|
|
|
6.35 |
9.09 |
|
32 |
1 1/4" |
42.16 |
1.65 |
2.77 |
3.56 |
4.85 |
|
|
|
3.56 |
3.56 |
|
4.85 |
4.85 |
|
|
|
6.35 |
9.70 |
|
40 |
1 1/2" |
48.26 |
1.65 |
2.77 |
3.68 |
5.08 |
|
|
|
3.68 |
3.68 |
|
5.08 |
5.08 |
|
|
|
7.14 |
10.16 |
|
50 |
2" |
60.33 |
1.65 |
2.77 |
3.91 |
5.54 |
|
|
|
3.91 |
3.91 |
|
5.54 |
5.54 |
|
|
|
8.74 |
11.07 |
|
65 |
2 1/2" |
73.03 |
2.11 |
3.05 |
5.16 |
7.01 |
|
|
|
5.16 |
5.16 |
|
7.01 |
7.01 |
|
|
|
9.52 |
14.02 |
|
80 |
3" |
88.9 |
2.11 |
3.05 |
5.49 |
7.62 |
|
|
|
5.49 |
5.49 |
|
7.62 |
7.62 |
|
|
|
11.13 |
15.24 |
|
90 |
3 1/2" |
101.6 |
2.11 |
3.05 |
5.74 |
8.08 |
|
|
|
5.74 |
5.74 |
|
8.08 |
8.08 |
|
|
|
|
|
|
100 |
4" |
114.3 |
2.11 |
3.05 |
6.02 |
8.56 |
|
|
|
6.02 |
6.02 |
|
8.56 |
8.56 |
|
11.13 |
|
13.50 |
17.12 |
|
125 |
5” |
141.3 |
2.77 |
3.40 |
6.55 |
9.52 |
|
|
|
6.55 |
6.55 |
|
9.52 |
9.52 |
|
12.70 |
|
15.90 |
19.05 |
|
150 |
6" |
168.28 |
2.77 |
3.40 |
7.11 |
10.97 |
|
|
|
7.11 |
7.11 |
|
10.97 |
10.97 |
|
14.30 |
|
18.20 |
21.95 |
|
200 |
8" |
219.08 |
2.77 |
3.76 |
8.18 |
12.70 |
|
6.35 |
7.04 |
8.18 |
8.18 |
10.30 |
12.70 |
12.70 |
15.10 |
18.20 |
20.60 |
23.00 |
22.22 |
|
250 |
10" |
273.05 |
3.40 |
4.19 |
9.27 |
12.70 |
|
6.35 |
7.80 |
9.27 |
9.27 |
12.70 |
12.70 |
15.09 |
18.26 |
21.44 |
25.40 |
28.58 |
|
|
300 |
12" |
323.85 |
3.96 |
4.57 |
9.52 |
12.70 |
|
6.35 |
8.38 |
9.52 |
10.31 |
14.27 |
12.70 |
17.48 |
21.44 |
25.40 |
28.58 |
33.32 |
|
|
350 |
14" |
355.6 |
3.98 |
4.78 |
|
|
6.35 |
7.92 |
9.52 |
9.52 |
11.13 |
15.09 |
12.70 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
|
400 |
16" |
406.4 |
4.19 |
4.78 |
|
|
6.35 |
7.92 |
9.52 |
9.52 |
12.70 |
16.66 |
12.70 |
21.44 |
26.19 |
30.96 |
36.53 |
40.49 |
|
|
450 |
18" |
459.2 |
4.19 |
4.78 |
|
|
6.35 |
7.92 |
11.13 |
9.52 |
14.27 |
19.05 |
12.70 |
23.83 |
29.36 |
34.92 |
39.67 |
45.24 |
|
|
500 |
20" |
508 |
4.77 |
5.53 |
|
|
6.35 |
9.52 |
12.70 |
9.52 |
15.09 |
20.62 |
12.70 |
26.19 |
32.54 |
38.10 |
44.45 |
50.01 |
|
|
550 |
22" |
558.8 |
4.77 |
5.53 |
|
|
6.35 |
9.52 |
12.70 |
9.52 |
15.87 |
22.22 |
12.70 |
28.57 |
34.92 |
41.27 |
47.62 |
53.97 |
|
|
600 |
24" |
609.6 |
5.54 |
6.35 |
|
|
6.35 |
9.52 |
14.70 |
9.52 |
17.48 |
24.61 |
12.70 |
30.96 |
38.89 |
46.02 |
52.37 |
59.94 |
|
|
650 |
26" |
660.4 |
|
|
|
|
7.92 |
12.70 |
|
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
700 |
28" |
711.2 |
|
|
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
750 |
30" |
762 |
6.35 |
7.92 |
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
800 |
32" |
812.8 |
|
|
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
Womic Steel adopts advanced production technology to ensure each904L Seamless Stainless Steel Pipemeets exact specifications and flawless surface quality.
1. Raw Material Selection:High-quality904LStainless Steel Pipe billets from certified mills (Baosteel, TISCO, POSCO).
2. Heating and Piercing:Billets heated to a controlled temperature and pierced using a rotary piercing mill to form hollow shells.
3. Hot Rolling:Shells elongated and rolled to desired size.
4. Cold Drawing / Cold Pilgering:Pipes refined to precise dimensions and improved surface finish.
5. Solution Annealing:Heat treatment to restore corrosion resistance and ductility.
6. Pickling & Passivation:Removal of oxides and creation of passive film for enhanced corrosion protection.
7. Straightening and Dimensional Calibration:Ensures consistent roundness and wall uniformity.
8. Final Inspection & Marking:Each pipe tested, marked with grade, heat number, and standard before packing.
This process guarantees a smooth internal bore, high structural integrity, and exceptional corrosion resistance across all batches of Womic Steel’s904LSeamless Steel Pipe.
Womic Steel utilizes state-of-the-art manufacturing technology to ensure every904LWelded Stainless Steel Pipe meets precise specifications and delivers excellent surface quality and performance.
1. Raw Material Selection:High-quality904Lstainless steel strips/coils from certified suppliers (e.g., Baosteel, TISCO, POSCO).
2. Slitting & Uncoiling:The steel coil is slit to the required width and uncoiled for feeding into the forming mill.
3. Forming & Welding:The strip is progressively formed into a cylindrical shape and the edges are welded together using advanced TIG or Plasma welding techniques to create a solid weld seam.
4. Weld Seam Treatment:The external weld bead is removed to achieve a smooth surface, and the internal bead may be controlled or treated for bore cleanliness.
5. Solution Annealing:A full heat treatment process is applied to dissolve carbides, restore corrosion resistance, and relieve stresses from welding and forming.
6. Sizing & Calibration:The pipe is passed through a sizing mill to achieve the final precise outer diameter and roundness.
7. Straightening:The pipe is straightened to ensure optimal linearity.
8. Pickling & Passivation:Chemical treatment removes scale and impurities, while promoting the formation of a protective passive oxide layer on the surface, including the weld zone.
9. Non-Destructive Testing (NDT):The weld seam is inspected using methods like Eddy Current or Ultrasonic Testing to ensure integrity and quality.
10. Final Inspection & Marking:Each pipe undergoes dimensional checks, visual inspection, and is marked with grade, heat number, and relevant standards before packaging.
This controlled process guarantees a consistent weld seam, excellent dimensional accuracy, and superior corrosion resistance for every batch of Womic Steel's904LWelded Steel Pipes.
Womic Steel offers a wide range of surface finishes to meet various industrial, sanitary, and decorative applications.
|
904LStainless Steel Pipe Surface Type |
904LStainless Steel Pipe Description |
|
Annealed & Pickled (AP Finish) |
Bright silver appearance after acid treatment, suitable for industrial piping. |
|
Bright Annealed (BA Finish) |
Mirror-like surface obtained through controlled atmosphere annealing. |
|
Polished Finish (180#, 240#, 320#, 400#, 600#) |
Smooth mechanical finish suitable for decorative and architectural use. |
|
Mirror Polished (8K) |
Ultra-reflective surface ideal for sanitary and high-end design. |
|
Brushed / Hairline Finish |
Satin linear texture for furniture and interior design. |
|
Passivated Finish |
Surface chemically treated to enhance corrosion protection. |
|
Electropolished Finish |
Extremely clean, smooth, and hygienic finish ideal for food and pharmaceutical equipment. |
Each 904L Stainless Steel Pipe surface is inspected for uniform gloss, absence of pits, and consistent finish quality.
Every904L Stainless Steel Pipeundergoes comprehensive inspection in accordance with ASTM, EN, and GB standards to guarantee reliability and performance:
l Visual & Dimensional Inspection:Surface, roundness, and thickness checked.
l Hydrostatic Pressure Test:100% tested for leakage and pressure resistance.
l Eddy Current Test:Detects surface and sub-surface imperfections.
l Ultrasonic Test (UT):Ensures internal integrity of the seamless structure.
l Positive Material Identification (PMI):Confirms correct chemical grade of the 904L Stainless Steel Pipe.
l Intergranular Corrosion Test (IGC):Validates resistance to sensitization.
l Flattening & Flaring Tests:Evaluate ductility and deformation capability.
l Hardness & Tensile Testing:Confirms mechanical compliance with ASTM standards.
l Surface Roughness and Cleanliness Check:For sanitary or polished tubes.
l Third-Party Inspection (SGS / BV / TUV):Available upon customer request.
These extensive tests ensure that every 904L Stainless Steel Pipe from Womic Steel meets the highest international standards for reliability and longevity.
904L stainless steel pipes are widely used in:
l Sulfuric acid plants (storage, piping, coolers)
l Phosphoric acid fertilizer production
l Acetic and formic acid service
l Seawater cooling systems and marine equipment
l Flue gas desulfurization (FGD) in power plants
l Chemical tank storage and transport
l Heat exchangers and condensers
l Pulp & paper bleach plants
l Pharmaceutical and food processing equipment
l High chloride and offshore environments
Womic Steel is a trusted manufacturer and exporter specializing in 904L Stainless Steel Pipe, committed to delivering premium quality and professional service.
Strict quality control under ISO 9001:2015 and PED certification.
Modern production lines and experienced technicians specializing in high alloy super austenitic stainless steels.
Complete testing, inspection, and documentation support including PMI, IGC, UT, ET, and hydrostatic testing.
Flexible customization and surface finishing options – AP, BA, polished, mirror, brushed, electropolished.
Fast production cycle and reliable global shipping with direct cooperation with global shipowners.
Both seamless and welded options covering OD from 10.3mm to 1219mm.
Professional loading and securing teams guaranteeing damage-free shipment.
Rapid delivery time – standard sizes kept in ready stock.
Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.
904L vs 316L / 254 SMO / Alloy 825 – Selection Guide
|
Grade |
PREN |
Yield Strength (MPa) |
Relative Cost |
Best Service |
|
316L |
24-26 |
170 |
1.0x |
General, mild acids, low chlorides |
|
904L |
34 |
220 |
2.5-3.0x |
Sulfuric/phosphoric acid, moderate chlorides |
|
254 SMO (S31254) |
43 |
300 |
3.5x |
Seawater, high chlorides, high temperatures |
|
Alloy 825 (N08825) |
30-35 |
240 |
4.0x |
Sour service, reducing acids |
Each 904L stainless steel pipe is securely packed and clearly labeled to ensure safe and efficient transport worldwide.
Packaging Methods:
Small diameter pipes: Bundle packing with woven fabric, iron strip bundle, plastic caps on both ends.
Hexagonal packaging: Bundle packing with woven fabric, iron strip bundle, plastic caps on both ends.
Medium and large size welded pipes: Wrapped with woven fabric by automatic packaging for export sea-worthy transport.
Export packaging: Wooden or steel crates for export sea-worthy transport.
Womic Steel’s Shipping and Delivery Strengths:
Direct cooperation with global shipowners ensures the most competitive freight rates.
Professional loading and securing teams guarantee damage-free shipment.
Efficient document preparation, minimizing customs delays.
Rapid delivery time — standard sizes kept in ready stock over 10,000 tons.
Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.
Each904LStainless Steel Pipe is securely packed and clearly labeled to ensure safe and efficient transport worldwide.
General packaging: Bundle packing with woven fabric, iron strip bundle, plastic cap on two ends for local truck transport.
Hexagonal packaging: Bundle packing with woven fabric, iron strip bundle, plastic cap on two ends for local truck transport.
Packaging of welded pipe in medium and large sizes: Wrapped with woven fabric by automatic packaging for export sea-worthy transport.
Packaging for medium and large size welded pipes to be exported: Wooden or steel crate packaging for export sea-worthy transport.
General packaging for products to be exported: Wooden box for export sea-worthy transport.
Packaging of condensation pipe and low-pressure heater tube: Wooden box for local truck and export sea-worthy transport.
1. Direct cooperation with global shipowners ensures the most competitive freight rates.
2. Professional loading and securing teams guarantee damage-free shipment.
3. Efficient document preparation, minimizing customs delays.
4. Rapid delivery time — standard sizes kept in ready stock more than 10,000tons.
5. Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.
Womic Steel is a trusted manufacturer and exporter specializing in904L Stainless Steel Pipe,committed to delivering premium quality and professional service.
l Strict quality control under ISO and PED certification.
l Modern production lines and experienced technicians.
l Complete testing, inspection, and documentation support.
l Flexible customization and surface finishing options.
l Fast production cycle and reliable global shipping.
For inquiries, technical support, or to request a quotation for your specific clad pipe requirements, please contact us:
Website: www.womicstainless.com
E‑mail: info@womicstainless.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for high‑quality stainless steel seamless pipes, metallurgically bonded clad tubes, and custom solutions for corrosion‑resistant applications.
