Womic Stainless Steel Co., Ltd
1. Enhanced Mechanical Strength
Nitrogen alloying increases yield strength compared with conventional 304
stainless steel, making 304N pipes suitable for structural and high-pressure
applications.
2. Excellent Corrosion Resistance
304N stainless steel pipe maintains excellent resistance to oxidation,
atmospheric corrosion, and many industrial chemicals.
3. Improved Structural Stability
Nitrogen strengthens the austenitic matrix, improving resistance to deformation
under load.
4. Good Weldability and Fabrication Performance
304N stainless steel pipe can be welded using conventional welding techniques
without special procedures.
5. Reliable Certification and Compliance
Products can be certified by major international inspection bodies includingABS,
BV, DNV, LR, GL, RINA, CCS, KR, and NK, and can also meetNORSOK
requirements for offshore engineering projects.
The304N Stainless Steel Pipeproduced by Womic Steel complies with multiple international standards used in pressure equipment, structural systems, and general industrial pipelines.
|
Standard |
Description |
Equivalent Grade |
|
ASTM A312 / A213 / A269 |
Stainless steel pipes for pressure and industrial service |
TP304N |
|
EN 10216-5 |
Seamless stainless steel tubes for pressure purposes |
1.4315 (X5CrNiN18-10) |
|
DIN 17456 / DIN 17458 |
Austenitic stainless seamless tubes |
X5CrNiN18-10 |
|
JIS G3459 |
Stainless steel pipes for general service |
SUS304N |
|
GB/T 14976 |
Stainless steel seamless pipes for fluid transport |
0Cr18Ni9N |
These standards ensure that304N Stainless Steel Pipemeets strict requirements forchemical composition, mechanical properties, dimensional tolerance, and inspection procedures.
Different specifications can be customized according to special requirements.
|
Execution Standard |
Main Standard |
Standard Grade |
|
GB (China) |
GB13296, GB/T14976, GB5310, GB/T21833 |
06Cr19Ni10, 022Cr19Ni10, 06Cr25Ni20, 07Cr17Ni12Mo2, 022Cr17Ni12Mo2, 07Cr19Ni11Nb, 022Cr22Ni5Mo3N |
|
NB (China Petrochemical Standard) |
NB/T 47019.1, NB/T 47019.5, NB/T 47019.6, NB/T 47019.7, NB/T 47019.9 |
06Cr19Ni10, 022Cr19Ni10, 06Cr25Ni20, 07Cr17Ni12Mo2, 06Cr19Ni13Mo3, 07Cr18Ni11Ti, 07Cr18Ni11Nb |
|
ASTM (USA) |
ASTM / ASME SA213,ASTM A249-24, ASTM A269,ASTM A312-24, ASTM A358-24, ASTM A376,ASTM A450,ASTM A511, ASTM B677, ASTM B622, ASTM B626, ASTM B464, ASTM B466,ASTM B677,ASTM A778-24, ASTM A813-24, ASTM A1016-23, ASTM A999-23, ASTM A789-24, ASTM A790-24 |
304 / 304L,304N,TP304H,TP309,TP310S,S 316 / 316L,TP316H,TP316N,TP316LN,TP316Ti, TP317L / 317,321 / 321H, 347 / 347H, S31254 (904L equivalent), S31803 (Duplex), S32205, S32750, S32760, S32404, S32550, S32520, S32900, S39274,UNS N08825, UNS N06625, UNS N10276,Alloy 20, Incoloy 800, Inconel 600, Inconel 690, Hastelloy B2, Alloy 200/201, Hastelloy C22 |
|
ASME (USA) |
SA/SB213, SA268, SA312, SA376, SA789, SA790, SB407, SB423, SB444, SB677 |
TP304/L/H, TP316/L/H/Ti, TP321/H, TP347/H, TP904L, S31254, S31803, S32205, S32750, S32760, N08810, N08825, N08020 |
|
EN / DIN (Europe) |
EN 10216-5, EN 10297-2, EN 10217-7 (2021),EN 10312 |
X2CrNi18-9 (1.4307), X5CrNi18-10 (1.4301), X2CrNiMo17-12-2 (1.4404), X5CrNiMo17-12-2 (1.4401), X6CrNiMoTi17-12-2 (1.4571), X2CrNiMoN22-5-3 (1.4462) |
|
JIS (Japan) |
JIS G3459, JIS G3463 |
SUS304/TP, SUS304LTP, SUS304HTB, SUS316/TP, SUS316LTP, SUS321TP, SUS347TP, SUS310STP |
|
GOST (Russia) |
GOST 9941, GOST 5632 |
08Х18Н10, 12Х18Н10Т, 10Х17Н13М2Т, 03Х17Н14М3, 08Х22Н6Т, 10Х17Н13М2Т, 03Х21Н21М4ГБ |
|
ISO (International) |
ISO 1127, ISO 9329-4 |
X2CrNi18-9, X2CrNiMo17-12-2, X2CrNiMoN22-5-3, X2CrNiMo17-13-3 |
|
Element |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
N |
|
304N Stainless Steel |
≤0.08 |
≤2.00 |
≤0.045 |
≤0.03 |
≤1.00 |
18.0–20.0 |
8.0–10.5 |
0.10–0.16 |
The addition ofnitrogen (N)enhances theyield strength and structural performanceof 304N stainless steel pipe compared with conventional 304 stainless steel.
304N stainless steel pipe offers improved mechanical strength while maintaining excellent ductility.
|
Property |
Unit |
304N |
|
Tensile Strength |
MPa |
≥515 |
|
Yield Strength |
MPa |
≥275 |
|
Elongation |
% |
≥40 |
|
Hardness |
HBW |
≤201 |
|
Density |
g/cm³ |
7.93 |
|
Melting Range |
°C |
1400–1450 |
The higher yield strength makes 304N Stainless Steel Pipe particularly suitable for structural piping and pressure-bearing applications.
304N stainless steel pipe is typicallysolution annealed at 1040–1080°C followed by rapid cooling.
This heat treatment:
1. Restores full corrosion resistance
2. Eliminates internal stress after forming or welding
3. Improves ductility and mechanical stability
Delivery Condition
304N Stainless Steel Pipes are normally supplied in the following conditions:
• Annealed and Pickled (AP)
• Bright Annealed (BA)
• Polished Surface(for decorative or sanitary applications)
Womic Steel uses advanced manufacturing technologies to ensure high-quality304N seamless stainless steel pipes.
1. Raw Material Selection – certified stainless billets from Baosteel, TISCO, POSCO.
2. Heating and Rotary Piercing – billets pierced into hollow shells.
3. Hot Rolling – elongation and diameter reduction.
4. Cold Drawing / Pilger Rolling – improved dimensional accuracy.
5. Solution Annealing – restoring corrosion resistance.
6. Pickling and Passivation – removal of oxide scale.
7. Straightening and Sizing – dimensional calibration.
8. Final Inspection and Marking.
This ensuresexcellent dimensional tolerance, smooth inner surface, and strong structural integrity.
Womic Steel produces high-quality304N welded stainless steel pipesthrough precision forming and welding technology.
1. Stainless steel coil preparation
2. Slitting and uncoiling
3. Roll forming
4. TIG or Plasma welding
5. Weld seam grinding
6. Solution annealing
7. Sizing and calibration
8. Pickling and passivation
9. Non-destructive testing
10. Final inspection and marking
• Outside Diameter:6mm – 1219mm
(1/4" – 48")
• Wall Thickness:0.5mm – 50mm (SCH 5S – SCH XXS)
• Pipe Length:Up to 12 meters
• Tolerance Standard:ASTM A999 / ISO 1127
Standard pipe dimensions can comply withANSI B36.19 and ANSI B36.10.
|
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 offers a wide range of surface finishes to meet various industrial, sanitary, and decorative applications.
|
304NStainless Steel Pipe Surface Type |
304NStainless 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 304NStainless Steel Pipe surface is inspected for uniform gloss, absence of pits, and consistent finish quality.
Every304N 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 304N 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 every304NStainless Steel Pipe from Womic Steel meets the highest international standards for reliability and longevity.
304N Stainless Steel Pipe is suitable for a wide range of industries, providing high strength, excellent corrosion resistance, and reliable performance in various service environments:
304N Stainless Steel Pipe for Chemical and Petrochemical Industry:Process piping, chemical transportation lines, and industrial fluid handling systems.
304N Stainless Steel Pipe for Food and Beverage Industry:Hygienic processing systems, liquid transfer pipelines, and food production equipment.
304N Stainless Steel Pipe for Pharmaceutical Equipment:Clean piping systems, sterile fluid transfer, and sanitary processing environments.
304N Stainless Steel Pipe for Heat Exchanger Tubes:Heat transfer systems such as boilers, condensers, and evaporators.
304N Stainless Steel Pipe for Marine Engineering:Marine pipelines, offshore structural piping systems, and seawater service applications (ship classification certifications available from ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK).
304N Stainless Steel Pipe for Construction and Structural Applications:Handrails, load-bearing structures, and architectural piping systems where higher strength is required.
304N Stainless Steel Pipe for Water Treatment and Gas Systems:Water supply pipelines, purification systems, and industrial gas transmission lines.
Each304NStainless 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 in304NStainless 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.
