JIS G3447 304TBS Stainless Steel Welded Pipe
Product Name: JIS G3447 304TBS Stainless Steel Welded Pipe
Standard:JIS G3447
Grade:304TBS
Material: Austenitic Stainless Steel
Pipe Type: Welded Stainless Steel Pipe
Manufacturing Process: Cold Rolled / Cold Drawn / Welded
Outer Diameter (OD): 15.9–508 mm
Wall Thickness: 0.8–12.0 mm
Length: 3000–12000 mm; Custom Length Available
Surface Finish: 2B, BA, No.4, Polished
Testing: Tensile Test, Flattening Test, Hydrostatic / Nondestructive Test
Surface Inspection: 100% Visual and Dimensional Inspection
Pipe Ends: Plain End / Beveled End
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of jis g3447 304tbs stainless steel welded pipe in China. With abundant experience, we warmly welcome you to wholesale customized jis g3447 304tbs stainless steel welded pipe from our factory. For price consultation, contact us.
If you are looking for high-cleanliness tubing designed specifically for high-hygiene sectors such as food processing, dairy products, beer brewing, and biopharmaceuticals, JIS G3447 304TBS stainless steel welded sanitary pipe is the ideal choice to meet strict hygiene standards and automated CIP/SIP cleaning requirements.
As a grade designated by the Japanese Industrial Standards (JIS) specifically for sanitary stainless steel pipes, 304TBS stainless steel pipe features excellent resistance to pitting corrosion and intergranular corrosion in common acid/alkali media, organic acids, and sanitizing cleaning solutions. Delivering a minimum tensile strength of 520 MPa, a yield strength of 205 MPa, an elongation of ≥ 35%, and a hardness of ≤ 90 HRB (≤ 200 HV), it not only provides outstanding pressure-bearing safety but also ensures no deformation or cracking during flaring, bending, and ferrule/clamp welding.
GNEE can supply JIS G3447 304TBS sanitary welded pipes. Their greatest advantage lies in extremely high internal wall cleanliness control and weld seam bead flattening technology. By combining automated TIG welding or high-frequency welding with internal weld seam flattening and mechanical or electropolishing (EP), the internal surface roughness can reach Ra ≤ 0.4 μm – 0.8 μm, fundamentally eliminating risks of media residue, scaling, and bacterial growth. Outer diameter tolerances are strictly controlled within ±0.10 mm, with custom cut lengths up to 6 meters per pipe. We also offer bright annealing (BA), 400#–600# mirror polishing, pickling, and plain end or bevel end processing. Every batch passes 100% pneumatic testing, hydrostatic testing, and eddy current testing (ET), accompanied by EN 10204 3.1 Mill Test Certificates.
JIS G3447 Stainless Steel Pipes specification
Chemical Composition (wt%)
The chemical requirements for 304TBS follow the standard SUS304 profile but focus on purity for sanitary applications.
| Grade | Symbol | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Nickel (Ni) | Chromium (Cr) |
| SUS304TBS | 304TBS | ≤ 0.08 | ≤ 1.00 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | 8.00 – 10.50 | 18.00 – 20.00 |
Mechanical Properties
Sanitary pipes require high ductility and moderate strength to facilitate tube bending and expanded joints.
| Property | Value (Metric) | Value (Imperial) |
| Tensile Strength, min. | 520 N/mm² (MPa) | 75,400 psi |
| Elongation, min. | 35 % | 35 % |
| Hardness (Brinell), max. | 192 HBW | 192 HBW |
| Hardness (Rockwell B), max. | 90 HRB | 90 HRB |
| Hardness (Vickers), max. | 200 HV | 200 HV |
Dimensional Standards (Common Sanitary Sizes)
JIS G3447 uses the "S" size designation system, which is standard for Japanese sanitary fittings.
| Nominal Size | Outside Diameter (OD) [mm] | Wall Thickness (T) [mm] | Tolerance (OD) [mm] | Tolerance (WT) |
| 1.0 S | 25.4 | 1.2 | ± 0.20 | ± 0.12 |
| 1.25 S | 31.8 | 1.2 | ± 0.20 | ± 0.12 |
| 1.5 S | 38.1 | 1.2 | ± 0.20 | ± 0.12 |
| 2.0 S | 50.8 | 1.5 | ± 0.20 | ± 0.15 |
| 2.5 S | 63.5 | 2.0 | ± 0.25 | ± 0.20 |
| 3.0 S | 76.3 | 2.0 | ± 0.30 | ± 0.20 |
| 4.0 S | 101.6 | 2.1 | ± 0.50 | ± 0.21 |
Surface Finish (Sanitary Requirements)
Surface roughness is the most critical aspect of JIS G3447 to prevent bacterial growth.
| Surface Type | Processing Method | Roughness (Ra) | Grit Finish (Ref) |
| Internal Surface | Mechanical Polish / Buffing | ≤ 1.0 μm | #320 – #400 |
| External Surface | Mechanical Polish / Buffing | ≤ 1.0 μm | #200 – #400 |
| Electro-Polished (EP) | Optional chemical process | ≤ 0.25 μm | High Purity |
JIS G3447 304TBS Stainless Steel Pipe applications:
Food and beverage production lines,
Dairy processing,
Pharmaceutical and biotechnology plants,
Cosmetic manufacturing equipment.
For further assistance, please provide:
The required size or outer diameter, the required length, and whether it is for new equipment installation or maintenance.
Quality Control
Flaring Test: Checks weld strength.
Flattening Test: Checks the toughness of the tubing.
Roughness Measurement: Uses a roughness tester to inspect the inner and outer walls.
Eddy Current Test: Checks for internal weld defects such as porosity or lack of fusion.
Hydrostatic Test: Verifies pressure resistance (typically 2.5 MPa).
Standard packaging
JIS G3447 304TBS Stainless Steel Welded Pipes are prepared with export-grade protection to maintain surface quality and dimensional integrity during handling and ocean transportation. Each pipe is fitted with plastic end caps, bundled with steel straps, and wrapped in waterproof material. Each bundle is marked with 304TBS grade, pipe size, wall thickness, length, heat number, and quantity for traceability. Standard bundles can be secured on steel frames or pallets, while reinforced wooden cases are available for smaller sizes and high-value orders.
FAQ
Q1: What is the primary application of the JIS G3447 standard?
A: JIS G3447 is a Japanese standard specifically established for sanitary-grade stainless steel pipes. It is primarily used in piping systems requiring high levels of hygiene, such as processing lines for milk, beer, fruit juice, and beverages, as well as material transfer pipelines in pharmaceutical plants. Its core objective is to prevent bacterial growth and material residue accumulation.
Q2: What does the designation "TBS" stand for?
A: TBS stands for "Tube for Beverage Sanitary."
"304TBS" indicates piping based on the SUS304 chemical composition that is specifically intended for sanitary applications in the food and beverage industries.
Q3: What is the difference between JIS G3447 and JIS G3459?
A: Surface requirements: G3447 mandates polishing of both internal and external surfaces (with specific Ra value limits), whereas G3459 (stainless steel pipes for general piping) typically features a pickled finish without strict roughness requirements.
Weld seam treatment: G3447 requires the removal of weld beads to ensure the inner wall is completely smooth; G3459 allows the weld seam to remain.
Q4: What is the difference between JIS G3447 and ASTM A270?
A: Both are standards for sanitary-grade piping, but they differ slightly in their dimensional systems:
ASTM A270: Uses fractional inch sizes (e.g., 1", 1-1/2", 2") with wall thicknesses typically at 0.065" or 0.083".
JIS G3447: Uses the unique Japanese "S" series (e.g., 1S = 25.4mm, 2S = 50.8mm), and wall thicknesses (1.2mm, 1.5mm, 2.0mm) differ slightly from those of A270.
Interchangeability: The outer diameters of 1S, 1.5S, and 2S pipes generally match those of imperial-sized pipes; however, thread types and sealing methods for fittings (e.g., IDF/ISO vs. Tri-Clamp) may require adaptation.
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