Stainless Steel 347 / 347h Instrumentation Tubes, SS 347/347h Instrumentation Tubes, 347/347h Stainless Steel Instrumentation Tube Manufacturer, SS 347/347h Instrumentation Tube Supplier, SS 347/347h Instrumentation Tube Exporter, Stainless Steel 347/347h Precision Tubing, SS 347/347h Small Diameter Tube ,SS 347/347h Instrumentation Tubes
Stainless Steel 347 and 347H Instrumentation Tubes are high-performance austenitic stainless steel tubes engineered for use in precision instrumentation, process control systems, and high-temperature environments. These grades are particularly known for their excellent resistance to intergranular corrosion, stress rupture, and oxidation, making them ideal for demanding applications across various industrial sectors. Their stabilized composition, especially with the addition of columbium (niobium), enhances structural stability during welding and high-temperature exposure.
Grade 347 is a columbium-stabilized stainless steel that provides excellent resistance to corrosion and oxidation, especially in strongly oxidizing environments. Grade 347H, on the other hand, is a high-carbon version of 347, designed for better performance at elevated temperatures. The increased carbon content in 347H enhances its creep strength and makes it suitable for pressure-containing systems operating above 1000°F (538°C). Both grades maintain good mechanical properties and toughness even at sub-zero temperatures, allowing for a wide range of applications.
347 and 347H stainless steel instrumentation tubes are widely used in industries such as oil and gas, chemical processing, power generation, refineries, and aerospace. They are commonly utilized in hydraulic and pneumatic instrumentation lines, heat exchangers, boiler tubes, condensers, and control systems where durability, corrosion resistance, and high-temperature strength are essential. Their ability to withstand extreme environments ensures long-term reliability and minimal maintenance.
These instrumentation tubes are available in both seamless and welded forms, ensuring versatility for various design and system requirements. They are manufactured according to international standards such as ASTM A213, A269, and A312, ensuring high quality and consistent performance. Tubes are typically supplied in sizes ranging from 1/8” to 1” OD, with wall thickness and lengths customizable based on project requirements. Surface finishes may include bright annealed, pickled, or polished, depending on application needs.
Specification of Stainless Steel 347 / 347h Instrumentation Tubes
| Property | Specification |
|---|---|
| Material Grades | Stainless Steel 347 / 347H |
| UNS Designation | 347: S34700 / 347H: S34709 |
| Standard Specifications | ASTM A213, ASTM A269, ASTM A312 |
| Type | Seamless / Welded |
| Outer Diameter (OD) | 1/8” to 1” (3.18 mm to 25.4 mm) (Custom sizes available) |
| Wall Thickness | 0.035” to 0.120” (0.89 mm to 3.05 mm) (or as specified) |
| Length | 6 m (standard) / Cut-to-length available |
| Surface Finish | Bright Annealed, Polished, Pickled, Descaled |
| Form | Straight Tubes / Coiled Tubes (on request) |
| Temperature Range | Up to 1500°F (816°C) for 347H (depending on pressure & application) |
| Corrosion Resistance | Excellent in oxidizing and intergranular corrosion environments |
| Tensile Strength (min) | 75,000 psi (515 MPa) |
| Yield Strength (min) | 30,000 psi (205 MPa) |
| Elongation (min) | 35% |
| Hardness (max) | 217 HB (Brinell Hardness) |
| Weldability | Good (resistant to weld decay; no post-weld annealing usually required) |
| Applications | Instrumentation Lines, Heat Exchangers, Chemical Plants, Refineries, Power Plants |
Chemical Composition of Stainless Steel 347 / 347h Instrumentation Tubes
Stainless Steel 347/347H instrumentation tubes offer numerous advantages, including excellent resistance to corrosive environments, high-temperature strength, good weldability, and dimensional precision. Their stabilized structure prevents carbide precipitation during welding, reducing the risk of intergranular corrosion. The high carbon content in 347H further enhances durability under thermal and mechanical stress, making these tubes a reliable choice for critical instrumentation and control systems.
Specification of Stainless Steel 347 / 347h Instrumentation Tubes
| Property | Specification |
|---|---|
| Material Grades | Stainless Steel 347 / 347H |
| UNS Designation | 347: S34700 / 347H: S34709 |
| Standard Specifications | ASTM A213, ASTM A269, ASTM A312 |
| Type | Seamless / Welded |
| Outer Diameter (OD) | 1/8” to 1” (3.18 mm to 25.4 mm) (Custom sizes available) |
| Wall Thickness | 0.035” to 0.120” (0.89 mm to 3.05 mm) (or as specified) |
| Length | 6 m (standard) / Cut-to-length available |
| Surface Finish | Bright Annealed, Polished, Pickled, Descaled |
| Form | Straight Tubes / Coiled Tubes (on request) |
| Temperature Range | Up to 1500°F (816°C) for 347H (depending on pressure & application) |
| Corrosion Resistance | Excellent in oxidizing and intergranular corrosion environments |
| Tensile Strength (min) | 75,000 psi (515 MPa) |
| Yield Strength (min) | 30,000 psi (205 MPa) |
| Elongation (min) | 35% |
| Hardness (max) | 217 HB (Brinell Hardness) |
| Weldability | Good (resistant to weld decay; no post-weld annealing usually required) |
| Applications | Instrumentation Lines, Heat Exchangers, Chemical Plants, Refineries, Power Plants |
🏭 Industry & Application
- ✅ SS 347/347h Instrumentation Tubes for Medical Industry
- ✅ SS 347/347h Instrumentation Tubes for Chemical Processing
- ✅ SS 347/347h Tubes for Instrumentation Lines
- ✅ Stainless Steel 347 / 347h Instrumentation 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 primary difference is the carbon content. SS 347H has a higher carbon content (0.04–0.10%) compared to SS 347 (max 0.08%), which provides better creep resistance and mechanical strength at elevated temperatures. SS 347 is preferred for general corrosion resistance, while 347H is used in high-temperature pressure systems.
Q2: What are the typical applications of 347/347H instrumentation tubes?
These tubes are commonly used in chemical processing plants, refineries, power generation facilities, aerospace systems, heat exchangers, boiler instrumentation, and control lines in oil & gas operations.
Q3: Are 347/347H tubes resistant to corrosion?
Yes. Both grades offer excellent resistance to intergranular corrosion, oxidation, and general corrosion, especially in high-temperature and oxidizing environments. The addition of columbium (niobium) stabilizes the structure and prevents carbide precipitation during welding.
Stainless Steel 347 / 347h Instrumentation Tubes exporter
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