Womic Stainless Steel Co., Ltd
347 stainless steel pipes contain niobium stabilizing elements, which prevent chromium carbide precipitation during welding and high-temperature exposure, ensuring excellent performance in temperatures up to 870°C.
The niobium stabilization improves resistance to grain boundary corrosion, especially in welded structures and high-temperature service environments.
347H stainless steel pipes feature higher carbon content, providing improved creep strength and high-temperature mechanical performance compared with standard 347 grade.
Both 347 and 347H stainless steel pipes offer excellent weldability, formability, and machinability, making them suitable for complex piping systems and pressure equipment.
Womic Steel can supply 347 / 347H Stainless Steel Pipes certified by major international inspection bodies including:
The347 / 347H Stainless Steel Pipeproduced by Womic Steel conforms to various international standards used for industrial pressure systems and high-temperature equipment.
|
Standard |
Description |
Equivalent Grade / Material Number |
|
ASTM A312 / A213 / A269 |
Stainless steel pipes for general and pressure service |
TP347 / TP347H |
|
EN 10216-5 |
Seamless stainless steel tubes for pressure purposes |
1.4550 (X6CrNiNb18-10) |
|
DIN 17456 / DIN 17458 |
Austenitic stainless seamless tubes |
X6CrNiNb18-10 |
|
JIS G3459 / G3463 |
Stainless steel pipes for heat-resisting applications |
SUS347 / SUS347HTB |
|
GB/T 14976 / GB/T 13296 |
Stainless steel pipes for fluid transport and boiler use |
0Cr18Ni11Nb |
These standards ensure the347 stainless steel pipes meet global requirements for chemical composition, mechanical properties, dimensional tolerances, and inspection standards.
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 |
Nb |
|
347 Stainless Steel Pipe |
≤0.08 |
≤2.00 |
≤0.045 |
≤0.03 |
≤1.00 |
17.0–19.0 |
9.0–13.0 |
≥10×C – 1.00 |
|
347H Stainless Steel Pipe |
0.04–0.10 |
≤2.00 |
≤0.045 |
≤0.03 |
≤1.00 |
17.0–19.0 |
9.0–13.0 |
≥10×C – 1.00 |
The addition ofniobium (Nb)stabilizes the structure and prevents chromium carbide precipitation during welding and prolonged heating.
|
Property |
Unit |
347 |
347H |
|
Tensile Strength |
MPa |
≥515 |
≥515 |
|
Yield Strength |
MPa |
≥205 |
≥205 |
|
Elongation |
% |
≥40 |
≥40 |
|
Hardness |
HBW |
≤201 |
≤201 |
|
Density |
g/cm³ |
7.93 |
7.93 |
|
Melting Range |
°C |
1390–1440 |
1390–1440 |
Both347 and 347H stainless steel pipesare normally supplied in thesolution annealed condition.
Typical heat treatment:
Solution Annealing Temperature:
1040–1100°C followed by rapid cooling.
This process:
l Restores corrosion resistance
l Relieves internal stresses
l Improves ductility
l Maintains niobium stabilization
Dimensions and Size Range of 347 / 347H Stainless Steel Pipe
Womic Steel supplies347 / 347H stainless steel pipesin a wide range of dimensions.
Outside Diameter:6 mm – 1219 mm (1/4" – 48")
Wall Thickness:0.5 mm – 50 mm (SCH5S – SCHXXS)
Length:up to 12 meters
Tolerance:ASTM A999 / EN ISO 1127
Pipes are available in bothseamless and welded formsdepending on application requirements.
Womic Steel adopts advanced production technology to ensure each347 / 347H Seamless Stainless Steel Pipemeets exact specifications and flawless surface quality.
1. Raw Material Selection:High-quality347 / 347HStainless 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’s347 / 347HSeamless Steel Pipe.
Womic Steel utilizes state-of-the-art manufacturing technology to ensure every347 / 347HWelded Stainless Steel Pipe meets precise specifications and delivers excellent surface quality and performance.
1. Raw Material Selection:High-quality347 / 347Hstainless 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's347 / 347HWelded Steel Pipes.
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 offers a wide range of surface finishes to meet various industrial, sanitary, and decorative applications.
|
347 / 347H Stainless Steel Pipe Surface Type |
347 / 347H Stainless 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 347 / 347H Stainless Steel Pipe surface is inspected for uniform gloss, absence of pits, and consistent finish quality.
Every347 / 347H 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 the347 / 347HStainless 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 347 / 347H Stainless Steel Pipe from Womic Steel meets the highest international standards for reliability and longevity.
When selecting stainless steel materials forhigh-temperature
industrial piping systems, engineers often compare316, 321,
and 347 stainless steel pipes.
All three grades belong to theaustenitic stainless steel family,
but they provide different performance advantages depending on the operating
conditions.
Among these materials,347 stainless steel pipeis specially designed forhigh-temperature service environments, thanks to itsniobium (Nb) stabilized composition, which enhances resistance to carbide precipitation and intergranular corrosion during prolonged heating.
Understanding the differences between321 stainless steel pipe, 316 stainless steel pipe, and 347 stainless steel pipehelps engineers choose the most suitable material for critical industrial applications.
Both321 stainless steel pipeand347 stainless steel pipeare stabilized grades developed to improve resistance tointergranular corrosion during welding and high-temperature service.
However, the stabilization mechanisms differ:
l 321 stainless steelusestitanium (Ti)as the stabilizing element
l 347 stainless steelusesniobium (Nb)
Niobium stabilization in347 stainless steel pipegenerally provides better resistance tocarbide precipitation during long-term exposure to elevated temperatures.
Advantages of 347 Stainless Steel Pipe Over 321
l Improvedhigh-temperature creep resistance
l Better stability duringlong-term thermal exposure
l Enhanced resistance tointergranular corrosion after prolonged heating
l More suitable forboilers, pressure vessels, and refinery heater systems
For systems operating continuously athigh temperatures,347 stainless steel pipe is often preferred over 321 stainless steel pipe.
316 stainless steel pipeis widely known for its excellentcorrosion resistance in chloride-containing environments, particularly inmarine, offshore, and chemical industries.
This corrosion resistance is due to the addition ofmolybdenum (Mo).
However, when systems operate underhigh temperature and long-term thermal stress,347 stainless steel pipe provides superior structural stability.
|
Property |
347 Stainless Steel Pipe |
316 Stainless Steel Pipe |
|
Stabilizing Element |
Niobium (Nb) |
Molybdenum (Mo) |
|
High Temperature Strength |
Excellent |
Moderate |
|
Intergranular Corrosion Resistance |
Excellent |
Good |
|
Chloride Corrosion Resistance |
Moderate |
Excellent |
|
Typical Applications |
Boilers, heat exchangers, refinery heaters |
Marine pipelines, chemical plants |
Forhigh-temperature process systems, furnace pipelines, and thermal equipment,347 stainless steel pipe is usually a better choicethan 316 stainless steel pipe.
347 and 347H stainless steel pipes are recommended for applications requiring long-term performance at elevated temperatures.
These materials are particularly suitable when:
l Operating temperatures exceed500°C
l Equipment is exposed tolong-term high-temperature service
l Systems require strong resistance tointergranular corrosion
l Applications involvepressure vessels, boilers, or refinery heaters
l Heat exchanger systems
l Petrochemical processing pipelines
l Oil refinery furnace piping
l Power plant steam systems
l Industrial furnace components
These applications benefit from theexcellent thermal stability and corrosion resistance of 347 stainless steel pipe.
Each347 / 347HStainless 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 in347 / 347H 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.
