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Stainless Steel 347/347H Pipes and Tubes are premium-grade austenitic stainless steels known for their excellent corrosion resistance and high strength at elevated temperatures. These pipes and tubes are widely used in industries where durability, resistance to oxidation, and reliability are critical. Sumer Metal Industries manufactures these products to meet international standards, ensuring consistent quality and performance.
SS 347/347H contains niobium (columbium) which stabilizes the material against chromium carbide precipitation, making it ideal for applications involving high-temperature service. This feature significantly enhances the longevity of piping systems in chemical processing plants, petrochemical industries, and power generation units. The material also exhibits superior resistance to intergranular corrosion, which is crucial for long-term industrial usage.
Stainless Steel 347 and 347H pipes and tubes are austenitic stainless steels engineered for superior high-temperature performance and corrosion resistance. They are widely used in chemical processing, petrochemical, power generation, and industrial furnace systems where thermal stability, strength, and long-term reliability are essential.
SS 347 contains approximately 17–19% chromium, 9–13% nickel, and small amounts of niobium and tantalum, which act as stabilizers to prevent carbide precipitation during welding. The 347H variant has a higher carbon content (0.04–0.10%) to maintain strength at elevated temperatures while retaining excellent corrosion resistance.
These pipes and tubes are available in a wide range of sizes, thicknesses, and finishes to meet diverse industrial requirements. Sumer Metal Industries ensures precision in manufacturing, offering seamless and welded variants of SS 347/347H pipes and tubes. The products are carefully tested for mechanical properties, dimensional accuracy, and surface finish before dispatch.
The versatility of Stainless Steel 347/347H makes it suitable for applications such as heat exchangers, boilers, exhaust systems, and chemical tanks. Its excellent resistance to stress corrosion cracking and high-temperature oxidation ensures reliable performance even under extreme operating conditions. Industries in UAE, Saudi Arabia, Kuwait, Qatar, Bahrain, and Oman trust Sumer Metal Industries for timely delivery and high-quality products.
347/347H pipes and tubes exhibit tensile strength ranging from 515–700 MPa and yield strength between 205–310 MPa. Elongation typically ranges from 35–45%, offering excellent toughness and ductility for high-pressure and high-temperature industrial applications.
The key advantage of 347/347H pipes and tubes is their ability to maintain mechanical integrity and corrosion resistance at temperatures up to 870°C (1598°F). Niobium and tantalum stabilization prevents carbide precipitation, ensuring durability and performance in thermal service and welded structures.
Specification Table
| Specification | Standard | Type | Size Range | Schedule/Thickness |
|---|---|---|---|---|
| Pipe | ASTM A312 / ASME SA312 | Seamless & Welded | 1/2" to 24" | Sch 5S to Sch 160 |
| Tube | ASTM A213 / ASME SA213 | Seamless & Welded | 6 mm OD to 219 mm OD | 1 mm to 20 mm Wall Thickness |
| Flats & Custom Sizes | ASTM A312 / ASTM A213 | Custom Fabrication | As per client requirement | As per client requirement |
Chemical Composition (Typical ranges for SS347/347h)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | 347 (wt%) | 347H (wt%) |
|---|---|---|
| Carbon (C) | Max 0.08 | 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) | Max 2.0 | Max 2.0 |
| Silicon (Si) | Max 1.0 | Max 1.0 |
| Phosphorus (P) | Max 0.045 | Max 0.045 |
| Sulfur (S) | Max 0.03 | Max 0.03 |
| Niobium (Nb + Ta) | Min 10 × C | Min 10 × C |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | 347 | 347H | Unit |
|---|---|---|---|
| Tensile Strength (Ultimate) | 515 – 750 | 515 – 750 | MPa |
| Yield Strength (0.2% Offset) | 205 – 310 | 205 – 310 | MPa |
| Elongation (in 50 mm) | 40 – 50 | 40 – 50 | % |
| Hardness (Brinell) | 150 – 220 | 150 – 220 | HB |
| Modulus of Elasticity | 193 | 193 | GPa |
| Density | 8.0 | 8.0 | g/cm³ |
Equivalent Grades
| Standard | Designation / Grade |
|---|---|
| ASTM / ASME | 347 / 347H |
| EN (European Standard) | 1.4550 / 1.4550H |
| JIS (Japanese Standard) | SUS 347 / SUS 347H |
| DIN (German Standard) | 1.4550 / 1.4550H |
| GB (Chinese Standard) | 0Cr18Ni12Nb / 0Cr18Ni12NbH |
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) | Wall Thickness | Weight per Meter (Approx.) | Schedule |
|---|---|---|---|---|
| 1/2" | 21.3 mm | 2.77 mm | 1.68 kg/m | Sch 40 |
| 3/4" | 26.7 mm | 2.87 mm | 2.11 kg/m | Sch 40 |
| 1" | 33.4 mm | 3.38 mm | 2.84 kg/m | Sch 40 |
| 2" | 60.3 mm | 3.91 mm | 5.31 kg/m | Sch 40 |
| 4" | 114.3 mm | 6.02 mm | 13.6 kg/m | Sch 40 |
| 6" | 168.3 mm | 7.11 mm | 22.9 kg/m | Sch 40 |
| 8" | 219.1 mm | 8.18 mm | 33.9 kg/m | Sch 40 |
| 10" | 273.0 mm | 9.27 mm | 48.0 kg/m | Sch 40 |
| 12" | 323.9 mm | 10.97 mm | 64.9 kg/m | Sch 40 |
Types Of Stainless Steel 347/347h Pipe & Tubes
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 Tube
347/347hH Stainless Steel Welded Tube
347/347h Stainless Steel Capillary Tube
347/347hH Stainless Steel Heat Exchanger Tubes
Frequently Asked Questions (FAQ)
Q1: What is Stainless Steel 347/347H?
A1: Stainless Steel 347 is an austenitic stainless steel stabilized with niobium (columbium) to resist intergranular corrosion. 347H has a higher carbon content, providing improved strength at elevated temperatures.
Q2: What are the key applications of SS 347/347H Pipes & Tubes?
A2: They are used in chemical and petrochemical industries, heat exchangers, boilers, exhaust systems, power plants, and high-temperature processing equipment.
Q3: What sizes and schedules are available?
A3: SS 347/347H pipes and tubes are available in a wide range of sizes from 1/2" to 24" NPS, wall thicknesses from 1 mm to 20 mm, and schedules from Sch 5S to Sch 160. Custom sizes are also available.
Pipes & Tubes Supplier
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