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Stainless Steel 347/347H Pipe & Fittings are premium-grade austenitic stainless steel products specially designed for high-temperature applications. Known for their excellent resistance to intergranular corrosion, these pipes and fittings are stabilized with niobium, making them ideal for welded components exposed to elevated temperatures. Industries such as chemical processing, power generation, and oil & gas rely on SS 347/347H for their durability and reliability.
The corrosion resistance of Stainless Steel 347/347H ensures long-term performance even in harsh environments. These fittings withstand oxidizing atmospheres and high-pressure steam, maintaining mechanical integrity over prolonged service. Their ability to resist pitting and crevice corrosion makes them suitable for chemical plants, refineries, and marine applications where stainless steel 304 or 316 may fail.
Stainless Steel 347 and 347H pipe and fittings are austenitic stainless steels designed for excellent high-temperature strength and corrosion resistance. They are widely used in chemical processing, petrochemical, power generation, and industrial furnace applications, where thermal stability and resistance to intergranular corrosion are critical.
SS 347 contains approximately 17–19% chromium, 9–13% nickel, and small amounts of niobium and tantalum, which stabilize the alloy against carbide precipitation. The 347H variant has higher carbon content (0.04–0.10%) to provide enhanced strength at elevated temperatures while maintaining excellent corrosion resistance.
Mechanical properties of SS 347/347H include high tensile and yield strength, along with excellent creep and stress-to-rupture characteristics at elevated temperatures. This makes them suitable for piping systems in boilers, heat exchangers, and other high-temperature equipment. The H-grade (347H) is specifically enhanced with higher carbon content to retain strength at temperatures exceeding 800°F (427°C).
Stainless Steel 347/347H Pipe & Fittings are available in a wide range of shapes and sizes, including elbows, tees, reducers, and flanges. They comply with ASTM A312, A403, and other international standards, ensuring consistent quality and compatibility with global piping systems. Their versatility allows engineers to design complex systems without compromising on performance.
347/347H pipe and fittings exhibit tensile strength ranging from 515–700 MPa and yield strength between 205–310 MPa. Elongation typically ranges from 35–45%, providing the ductility and toughness required for high-pressure and high-temperature applications.
These stainless steel fittings can withstand temperatures up to 870°C (1598°F) while maintaining mechanical integrity. The addition of niobium and tantalum prevents carbide precipitation during welding, ensuring resistance to intergranular corrosion in thermal service.
Specification Table
| Property | Specification |
|---|---|
| Material Type | Austenitic Stainless Steel |
| Grades | SS 347, SS 347H |
| Standards | ASTM A312 / A403 / ASME B16.9 / ASME B16.28 / ASME B16.11 |
| Size Range | 1/2" to 48" (DN15 to DN1200) or as per customer requirement |
| Schedule / Thickness | Sch 5S to Sch XXS / Custom Thickness Available |
| Surface Finish | Mill Finish, Polished, or Customized |
| Applications | Chemical & Petrochemical Plants, Power Plants, Boilers, High-Temperature Piping Systems |
| Key Features | High corrosion resistance, Excellent high-temperature strength, Durable and reliable |
Chemical Composition (Typical ranges for SS347/347h)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | SS 347 | SS 347H |
|---|---|---|
| Carbon (C) | 0.08 max | 0.04 – 0.10 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 | 9.0 – 13.0 |
| Manganese (Mn) | 2.0 max | 2.0 max |
| Silicon (Si) | 1.0 max | 1.0 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Niobium + Tantalum (Nb+Ta) | Min 10×C | Min 10×C |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | SS 347 | SS 347H |
|---|---|---|
| Tensile Strength (MPa) | 515 min | 515 min |
| Yield Strength (0.2% Offset, MPa) | 205 min | 205 min |
| Elongation (%) | 40 min | 40 min |
| Hardness (HRB) | 90 max | 90 max |
| Temperature Resistance | Up to 870°C (1600°F) | Up to 870°C (1600°F) |
| Creep & Stress Rupture | Excellent at high temperatures | Enhanced for higher carbon content |
Equivalent Grades
| Standard | SS 347 | SS 347H |
|---|---|---|
| ASTM / ASME | 347 | 347H |
| EN / European | X6CrNiNb17-12 | X6CrNiNb17-12 |
| JIS / Japanese | SUS347 | SUS347H |
| GB / Chinese | 06Cr19Ni10 | 06Cr19Ni10H |
| UNS | S34700 | S34709 |
| EN Equivalent | 1.4550 | 1.4550 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Pipe Size (NPS) | Outside Diameter (OD, mm) | Wall Thickness (Schedule) | Approx. Weight (kg/m) |
|---|---|---|---|
| 1/2" | 21.3 | Sch 10S | 1.27 |
| 3/4" | 26.7 | Sch 10S | 1.68 |
| 1" | 33.4 | Sch 10S | 2.27 |
| 1 1/2" | 48.3 | Sch 10S | 4.11 |
| 2" | 60.3 | Sch 10S | 5.48 |
| 3" | 88.9 | Sch 10S | 9.14 |
| 4" | 114.3 | Sch 10S | 13.5 |
| 6" | 168.3 | Sch 10S | 24.3 |
| 8" | 219.1 | Sch 10S | 34.0 |
| 10" | 273.0 | Sch 10S | 47.3 |
| 12" | 323.9 | Sch 10S | 61.0 |
Types Of Stainless Steel 347/347h Pipe & Fittingss and Fittingss
SS 347/347h Seamless Pipe
SS 347/347h Welded Pipe
SS 347/347h ERW Pipe
SS 347/347hS EFW Pipe
Stainless Steel 347/347hS Seamless Fittings
347/347hH Stainless Steel Welded Fittings
347/347h Stainless Steel Capillary Fittings
347/347hH Stainless Steel Heat Exchanger Fittingss
Frequently Asked Questions (FAQ)
1. What is Stainless Steel 347/347H?
Stainless Steel 347 is a stabilized austenitic stainless steel containing niobium for improved resistance to intergranular corrosion. 347H is a high-carbon version designed to retain strength at elevated temperatures.
2. What are the common applications of SS 347/347H Pipe & Fittings?
They are used in chemical and petrochemical industries, power plants, boilers, heat exchangers, and high-temperature piping systems due to their excellent corrosion resistance and high-temperature strength.
3. What standards do SS 347/347H Pipes and Fittings conform to?
They typically conform to ASTM A312, ASTM A403, ASME B16.9, ASME B16.11, and ASME B16.28 standards.
4. What is the difference between SS 347 and SS 347H?
The main difference is carbon content. 347H has higher carbon (0.04–0.10%) compared to 347 (max 0.08%), which gives it better strength retention at high temperatures.
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