Stainless Steel 347 / 347h Sanitary Tubes, 347/347h Stainless Steel Sanitary Tube Manufacturer, SS 347/347h Sanitary Tube Supplier, SS 347/347h Sanitary Tube Exporter, Stainless Steel 347/347h Precision Tubing, SS 347/347h Small Diameter Tube ,SS 347/347h Sanitary Tubes
Stainless Steel 347 and 347H Sanitary Tubes are premium-grade austenitic stainless steel products engineered for use in sanitary and high-temperature applications. These grades are stabilized with columbium (niobium), which significantly enhances their resistance to intergranular corrosion — a critical feature in processes involving repeated thermal cycling or welding. Type 347 is ideal for most sanitary piping systems, while Type 347H offers improved high-temperature strength due to its higher carbon content.
These sanitary tubes are specifically designed to meet the stringent hygiene and cleanliness requirements of industries such as food and beverage processing, pharmaceuticals, dairy, biotechnology, and cosmetics. The internal surface of the tubes is mechanically polished or electropolished to achieve a smooth, mirror-like finish, minimizing the risk of bacterial contamination and ensuring easy cleaning. With surface roughness typically below 15 Ra µin, they support strict clean-in-place (CIP) and sterilize-in-place (SIP) procedures.
From a mechanical perspective, Stainless Steel 347/347H offers excellent strength, durability, and resistance to high-temperature scaling — up to approximately 870°C (1600°F). These properties make them ideal for processes involving heat exchangers, chemical piping, and steam lines, where both structural integrity and hygiene are crucial. Their superior weldability and formability also allow for precise fabrication and installation in complex piping systems.
Available in a wide range of sizes, wall thicknesses, and surface finishes, these sanitary tubes conform to international standards such as ASTM A269, ASTM A270, ASME SA270, and 3A sanitary requirements (when specified). They can be supplied with plain ends, beveled ends, or custom sanitary fittings such as tri-clamp, butt-weld, or threaded connections. Custom lengths and electropolished variants are also available to meet project-specific needs.
Specification of Stainless Steel 347 / 347h Sanitary Tubes
| Property | Specification |
|---|---|
| Material Grades | Stainless Steel 347 / 347H |
| Standards | ASTM A269, ASTM A270, ASME SA269, ASME SA270, DIN 11850, EN 10357 |
| Outer Diameter (OD) | 1/2" to 12" (12.7 mm to 304.8 mm) or as per customer requirement |
| Wall Thickness | 0.035” to 0.120” (0.89 mm to 3.05 mm) or as specified (Sch 5S, 10S, 40S, etc.) |
| Surface Finish | 180 grit, 240 grit, 320 grit, Mechanical Polish (MP), Electropolished (EP) |
| Surface Roughness (Ra) | ≤ 15 Ra µin (≤ 0.38 µm), customizable based on sanitary requirements |
| End Types | Plain End (PE), Beveled End (BE), Tri-Clamp / Sanitary Fittings |
| Temperature Resistance | Up to 870°C (1600°F) |
| Tensile Strength (min) | 75 ksi (515 MPa) |
| Yield Strength (min) | 30 ksi (205 MPa) |
| Elongation (%) | 35% minimum |
| Hardness (Max) | 217 Brinell (BHN) |
| Weldability | Excellent – Suitable for TIG, MIG, and orbital welding |
| Corrosion Resistance | Excellent – Especially against intergranular corrosion and high-temp oxidation |
| Applications | Food & Beverage, Pharmaceutical, Dairy, Biotech, Chemical Processing |
| Certification | 3.1 Material Test Certificate (MTC), FDA, 3A (on request) |
Chemical Composition of Stainless Steel 347 / 347h Sanitary Tubes
| Element | 347 (%) | 347H (%) | Function / Purpose |
|---|---|---|---|
| Carbon (C) | ≤ 0.08 | 0.04 – 0.10 | Improves high-temperature strength (higher in 347H) |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | Enhances hot-working properties |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | Kept low to avoid embrittlement |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | Kept low for better weldability and corrosion resistance |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | Improves oxidation resistance |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 | Primary corrosion-resistant element |
| Nickel (Ni) | 9.0 – 13.0 | 9.0 – 13.0 | Provides ductility, toughness, and corrosion resistance |
| Columbium + Tantalum (Cb + Ta) | ≥ 10xC (typ. 0.3 – 1.10) | ≥ 10xC (typ. 0.3 – 1.10) | Stabilizing elements to prevent intergranular corrosion |
| Iron (Fe) | Balance | Balance | Base metal |
In summary, Stainless Steel 347 / 347H Sanitary Tubes offer a reliable, corrosion-resistant, and hygienic solution for demanding industrial applications. Whether used in sterile environments, high-temperature processing, or corrosive chemical handling, these tubes deliver long-term performance, reduced maintenance, and full compliance with industry hygiene standards.
Specification of Stainless Steel 347 / 347h Sanitary Tubes
| Property | Specification |
|---|---|
| Material Grades | Stainless Steel 347 / 347H |
| Standards | ASTM A269, ASTM A270, ASME SA269, ASME SA270, DIN 11850, EN 10357 |
| Outer Diameter (OD) | 1/2" to 12" (12.7 mm to 304.8 mm) or as per customer requirement |
| Wall Thickness | 0.035” to 0.120” (0.89 mm to 3.05 mm) or as specified (Sch 5S, 10S, 40S, etc.) |
| Surface Finish | 180 grit, 240 grit, 320 grit, Mechanical Polish (MP), Electropolished (EP) |
| Surface Roughness (Ra) | ≤ 15 Ra µin (≤ 0.38 µm), customizable based on sanitary requirements |
| End Types | Plain End (PE), Beveled End (BE), Tri-Clamp / Sanitary Fittings |
| Temperature Resistance | Up to 870°C (1600°F) |
| Tensile Strength (min) | 75 ksi (515 MPa) |
| Yield Strength (min) | 30 ksi (205 MPa) |
| Elongation (%) | 35% minimum |
| Hardness (Max) | 217 Brinell (BHN) |
| Weldability | Excellent – Suitable for TIG, MIG, and orbital welding |
| Corrosion Resistance | Excellent – Especially against intergranular corrosion and high-temp oxidation |
| Applications | Food & Beverage, Pharmaceutical, Dairy, Biotech, Chemical Processing |
| Certification | 3.1 Material Test Certificate (MTC), FDA, 3A (on request) |
🏭 Industry & Application
- ✅ SS 347/347h Sanitary Tubes for Medical Industry
- ✅ SS 347/347h Sanitary Tubes for Chemical Processing
- ✅ SS 347/347h Tubes for Sanitary Lines
- ✅ Stainless Steel 347 / 347h Sanitary Tubes for Gas & Liquid Flow
- ✅ SS 347/347h Tubes for Heat Exchangers
❓ Frequently Asked Questions (FAQs)
Q1:What is the difference between Stainless Steel 347 and 347H?
The main difference is the carbon content. 347H has a higher carbon content (0.04–0.10%) than 347 (max 0.08%), which provides improved high-temperature strength and creep resistance. 347 is generally used in sanitary and standard pressure applications, while 347H is preferred in elevated temperature environments.
Q2:Are 347/347H sanitary tubes suitable for food and pharmaceutical applications?
Yes. When manufactured and finished to sanitary standards (e.g., electropolished or mechanically polished with Ra ≤ 15 µin), 347/347H tubes are ideal for food processing, pharmaceutical, dairy, and biotech applications due to their excellent corrosion resistance and cleanability.
Q3:Can 347/347H sanitary tubes be welded?
Yes. These grades offer excellent weldability using common methods like TIG, MIG, or orbital welding. Since 347/347H is stabilized with columbium (niobium), they resist intergranular corrosion during and after welding, making them superior to unstabilized stainless steels in welded applications.
Stainless Steel 347 / 347h Sanitary Tubes exporter
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At Sumer Metal Industries Pvt. Ltd., we follow a zero-defect policy by implementing stringent quality checks, using certified raw materials, and continuously improving our processes to deliver reliable and consistent tubing solutions
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