Stainless Steel 347 Pipe & Tube Manufacturer
When it comes to high-temperature, high-pressure applications that demand exceptional corrosion resistance and structural integrity, Stainless Steel 347 Pipe and 347H Pipe & Tube stand in a class of their own. At Aashish Metal & Alloys, we manufacture and supply premium-grade SS 347/347H pipes and tubes that meet the most rigorous international standards — including ASTM A312, ASME SA312, A213, A269, and A358. Stabilized with columbium (niobium), Grade 347 offers outstanding resistance to intergranular corrosion and carbide precipitation, making it the preferred choice for welded assemblies in aggressive environments. The high-carbon 347H variant delivers superior creep strength at elevated temperatures, making it indispensable for power generation boilers, heat exchangers, and petrochemical reactors. From 1/8″ NB to 48″ OD in seamless, welded, ERW, and EFW forms, we stock an extensive inventory and deliver precision-engineered custom sizes with full MTCs and third-party inspection. Get your quote today and experience the Aashish Metal & Alloys commitment to quality and reliability
- Stainless Steel 347 / 347H Pipes & Tubes Specifications
- Stainless Steel 347 / 347H Pipes & Tubes Equivalent Grades
- Stainless Steel 347 / 347H Pipes & Tubes Quality and Test reports
- Related Types Of Stainless Steel 347 / 347H Pipes & Tubes
- 347 / 347H Stainless Steel Pipes, Tube Stock and Supply Range
- 347 / 347H Stainless Steel Pipe & Tube Dimensions
- 347 / 347H Stainless Steel Pipe & Tubes Sizes
- Stainless Steel 347 / 347H Pipes & Tubes Pressure Ratings
- Chemical Composition
- Mechanical Properties
- Stainless Steel 347 / 347H Pipes & Tubes price list
- We supply of variety SS 347 / 347H Pipe & Tubing
- Application Of SS 347 / 347H Pipes & Tubes
What is Stainless Steel 347 Pipe & Tube?
Stainless Steel 347 is a columbium (niobium) and tantalum stabilized austenitic chromium-nickel stainless steel alloy. The addition of columbium prevents the sensitization (carbide precipitation at grain boundaries) that typically occurs in unstabilized austenitic grades like 304 and 316 when exposed to the 425–900°C temperature range. This makes SS 347 exceptionally suitable for welded components and structures that cannot undergo post-weld annealing.
SS 347H is the high-carbon variant of grade 347, designed specifically for elevated temperature service where enhanced creep and stress-rupture strength are required. It is widely specified for power plant boiler components, superheater tubes, and heat exchanger applications operating above 600°C.
SS 347 / 347H Pipe & Tube Specifications
| Parameter | Details |
|---|---|
| Standard | ASTM A312, ASME SA312, ASTM A213, A269, A249, A358, A376, A409, A813, A814 |
| Size (Seamless) | 1/8″ NB to 24″ NB / OD 6mm to 914.4mm |
| Size (Welded / EFW) | 1/2″ to 24″ NB / 6″ NB to 100″ NB |
| Thickness Range | 0.3mm – 50mm; SCH 5S, 10S, 10, 20, 40, STD, 40S, 60, 80S, 80, 100, 120, 140, 160, XXS, XS |
| Outside Diameter | 6mm OD up to 914.4mm; Ex-stock up to 24″ NB |
| Type | Seamless, Welded, ERW, EFW, LSAW, Fabricated, CDW |
| Form | Round, Square, Rectangular, Oval, U-Shape, Hydraulic, Coiled |
| End Condition | Plain End (PE), Beveled End (BE), Threaded Both Ends (TBE) |
| Surface Finish | 2B, No.1, No.4, No.8 Mirror Finish, Electropolished, Pickled |
| Delivery Condition | Annealed & Pickled, Bright Annealed, Polished, Cold Drawn |
| Length | Single Random, Double Random, Cut-to-Length |
| Heat Treatment | Solution Annealed, Normalized & Tempered |
| Packing | Wooden Boxes, Wooden Pallets, Plastic Bags, Steel Strip Bundled, Shrink Wrapped |
Chemical Composition of SS 347 Pipe
| Grade | C | Cr | Ni | Mn | Si | P (max) | S (max) | Cb/Ta |
|---|---|---|---|---|---|---|---|---|
| SS 347 | 0.08 max | 17.0–20.0 | 9.0–13.0 | 2.0 max | 1.0 max | 0.045 | 0.030 | 10xC min, 1.10 max |
| SS 347H | 0.04–0.10 | 17.0–20.0 | 9.0–13.0 | 2.0 max | 1.0 max | 0.045 | 0.030 | 8xC min, 1.10 max |
Mechanical Properties of SS 347 / 347H Pipe & Tube
| Property | SS 347 | SS 347H |
|---|---|---|
| Tensile Strength (MPa min) | 515 | 515 |
| Yield Strength 0.2% (MPa min) | 205 | 205 |
| Elongation (% in 50mm) min | 35% | 40% |
| Hardness Brinell (HB) max | 201 | 201 |
| Hardness Rockwell B max | 92 | 95 |
| Density (g/cm³) | 8.0 | 8.0 |
| Melting Point | 1454°C (2650°F) | 1454°C (2650°F) |
Physical Properties of SS 347 Pipe
| Property | Value |
|---|---|
| Density (lb/in³ / kg/m³) | 0.288 / 8000 |
| Elastic Modulus (GPa) | 193 |
| Thermal Conductivity (W/m·K at 100°C) | 16.2 |
| Coefficient of Thermal Expansion (m/m/°C, 0–100°C) | 17.2 |
| Specific Heat (J/kg·K at 0–1000°C) | 500 |
Equivalent Grades — SS 347 / 347H
| Standard | Werkstoff Nr. | UNS | JIS | GOST | EN |
|---|---|---|---|---|---|
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
| SS 347H | 1.4961 | S34709 | SUS 347H | — | X6CrNiNb18-12 |
SS 347 Pipe Dimensions — Wall Thickness Schedule
| NPS (in) | OD (mm) | SCH 5S | SCH 10S | SCH 40 / STD | SCH 80 / XS | SCH 160 | XXS |
|---|---|---|---|---|---|---|---|
| 1/8 | 10.3 | — | 1.24 | 1.73 | 2.41 | — | — |
| 1/4 | 13.7 | — | 1.65 | 2.24 | 3.02 | — | — |
| 1/2 | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 | — | 4.78 / 7.47 |
| 3/4 | 26.7 | 1.65 | 2.11 | 2.87 | 3.91 | — | 5.56 / 7.82 |
| 1 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 | 9.09 |
| 1-1/2 | 48.3 | 1.65 | 2.77 | 3.68 | 5.08 | 7.14 | 10.15 |
| 2 | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 | 11.07 |
| 3 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 | 15.24 |
| 4 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 11.13 | 17.12 |
| 6 | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 | 14.27 | 21.95 |
| 8 | 219.1 | 2.77 | 3.76 | 8.18 | 12.70 | 15.09 | 22.23 |
| 10 | 273.0 | 3.40 | 4.19 | 9.27 | 12.70 | 15.09 | 25.40 |
| 12 | 323.9 | 3.96 | 4.57 | 9.53 | 12.70 | 17.48 | 25.40 |
We Supplied a Comprehensive Range Of 347 / 347H Stainless Steel Pipes & Tubes
Types of Stainless Steel 347 Pipe & Tube We Supply
SS 347 / 347H Seamless Pipe
SS 347 / 347H Welded Pipe
SS 347 / 347H ERW Pipe
SS 347 / 347H EFW Pipe
SS 347 / 347H Seamless Tubes
SS 347 / 347H Welded Tubes
SS 347 / 347H ERW Tubes
SS 347 / 347H Square Tubes
SS 347 / 347H Rectangle Tubes
SS 347 / 347H Round Tubes
SS 347 / 347H Square Pipe
SS 347 / 347H Rectangular Pipe
SS 347 / 347H Round Pipe
SS 347 / 347H Heat Exchanger Tube
SS 347 / 347H Capillary Tubing
SS 347 / 347H Electropolished Pipes
Applications & Industries Served
| Industry | Typical Application |
|---|---|
| Power Generation | Superheater tubes, boiler headers, steam lines, economiser tubes |
| Petrochemicals | High-temperature reactor vessels, distillation columns, transfer piping |
| Oil & Gas | Refinery furnace tubes, offshore platform piping, wellhead components |
| Chemical Processing | Acid service piping, heat exchangers, condenser tubes, reactors |
| Pharmaceuticals | Sterile process lines, CIP/SIP systems, clean-room tubing |
| Food & Beverage | Sanitary piping, storage tanks, heat exchangers, evaporators |
| Aerospace | Exhaust manifolds, collector rings, aircraft structural components |
| Sugar & Fertilizer | Evaporator tubes, condenser tubes, high-pressure process lines |
| Paper & Pulp | Kraft digesters, bleach plant piping, recovery boilers |
| Marine | Seawater service systems, marine heat exchangers, deck piping |
Why SS 347/347H is Superior — Key Advantages
- Columbium stabilization prevents sensitization and intergranular corrosion after welding — no post-weld annealing required
- Excellent performance in the critical 425–900°C temperature range where unstabilized grades fail
- SS 347H offers significantly higher creep and stress-rupture strength compared to standard 347 at temperatures above 600°C
- Outstanding resistance to chloride stress corrosion cracking and crevice corrosion
- Superior weldability and formability — suitable for complex fabrications without loss of corrosion resistance
- Cryogenic performance: retains toughness and ductility at sub-zero temperatures
- Compatible with a wide range of inorganic and organic chemicals
- Long service life and low maintenance costs in aggressive environments
Quality Assurance, Standards & Certifications
| Standard Body | Standard | Scope |
|---|---|---|
| ASTM / ASME | A312 / SA312 | Seamless, straight-seam welded austenitic pipe |
| ASTM / ASME | A213 / SA213 | Seamless ferritic/austenitic alloy steel boiler tubes |
| ASTM / ASME | A269 / SA269 | Seamless & welded austenitic stainless steel tubing |
| ASTM / ASME | A249 / SA249 | Welded austenitic boiler, superheater, heat exchanger tubes |
| ASTM | A358 | EFW austenitic stainless steel pipe — corrosive/high-temp service |
| ASTM | A376 | Seamless austenitic pipe for high-temperature central station service |
| ASTM | A409 | LSAW large-diameter thin-wall austenitic pipe |
| DIN | 1.4550 / 1.4961 | European Werkstoff equivalents for SS 347 / 347H |
| IBR | IBR Approved | Indian Boiler Regulations approval for boiler-grade pipes |
- Positive Material Identification (PMI) — confirms alloy composition
- Hydrostatic Pressure Test — verifies leak-free performance under pressure
- Ultrasonic Testing (UT) — detects internal defects and discontinuities
- Intergranular Corrosion (IGC) Test — confirms weld-area corrosion resistance
- Mechanical & Tensile Testing — tensile strength, yield, elongation, hardness
- Spectro Analysis for Chemical Composition verification
- Eddy Current Examination — detects surface and sub-surface flaws
- Dimensional & Visual Inspection — tolerances, straightness, surface finish
- Flaring & Flattening Tests — evaluates mechanical deformation limits
- Radiography Test (RT) for weld integrity
- EN 10204 3.1 Mill Test Certificate (MTC)
- Third-Party Inspection Reports (TPI) from approved agencies
- Raw Material Traceability Reports
- Heat Treatment Records
- IBR Test Certificate (Form III-D)
- NABL-Approved Laboratory Reports
SS 347/347H Pipe Pressure Ratings (psi)
| Pipe Size | Schedule | 100°F | 300°F | 500°F | 650°F | 750°F |
|---|---|---|---|---|---|---|
| 1″ | 40 | 3048 | 2362 | 2019 | 1867 | 1810 |
| 1″ | 80 | 4213 | 3265 | 2791 | 2580 | 2501 |
| 1″ | 160 | 6140 | 4759 | 4068 | 3761 | 3646 |
| 2″ | 40 | 1902 | 1474 | 1260 | 1165 | 1129 |
| 2″ | 80 | 2747 | 2129 | 1820 | 1682 | 1631 |
| 4″ | 40 | 1531 | 1187 | 1014 | 938 | 909 |
| 4″ | 80 | 2213 | 1715 | 1466 | 1355 | 1314 |
| 6″ | 40 | 1219 | 945 | 808 | 747 | 724 |
| 8″ | 80 | 1692 | 1311 | 1121 | 1036 | 1005 |
| 10″ | 40 | 974 | 755 | 694 | 596 | 578 |
Price of SS 347 / 347H Pipe & Tube
| Product | Indicative FOB Price Range (USD) |
|---|---|
| SS 347 Seamless Pipe | USD 2.0 – 10.09 / kg (on request) |
| SS 347H Welded Pipe | USD 2.0 – 10.09 / kg (on request) |
| SS 347 ERW Pipe | USD 2.0 – 10.09 / kg (on request) |
| SS 347 Hollow / Structural Tube | USD 2.0 – 10.09 / kg (on request) |
| SS 347 Capillary / Precision Tube | USD 2.8 – 3.7 / kg (on request) |
| SS 347 Mirror Polish Seamless Pipe | USD 1400 – 4000 / Ton (on request) |
Our Manufacturing & Supply Process
Step 1 — Raw Material Sourcing
We source prime-quality stainless steel billets and coils from SAIL, JSW, Jindal, and internationally approved mills in Japan, Korea, Europe, and the USA. Every heat is verified by spectro analysis before processing.
Step 2 — Manufacturing
Depending on the product specification, pipes are produced by hot extrusion, cold drawing, electric resistance welding, or electric fusion welding. All processes are executed under ISO 9001:2015 certified quality management systems.
Step 3 — Heat Treatment & Finishing
All pipes and tubes undergo solution annealing at 1040–1120°C, followed by rapid quenching, to achieve optimum corrosion resistance and mechanical properties. Finishing options include pickling, bright annealing, polishing, and electropolishing.
Step 4 — Inspection & Testing
Each lot undergoes comprehensive testing including chemical analysis, mechanical testing, dimensional inspection, hydrostatic pressure testing, and NDT (UT/ET/RT) as per the applicable ASTM/ASME standard.
Step 5 — Packaging & Dispatch
Products are packed in export-quality wooden crates, plastic bags, or shrink-wrapped bundles with end caps to prevent moisture and mechanical damage. Full marking includes grade, size, heat number, schedule, and manufacturer logo for complete traceability.
For More Information About Stainless Steel 347 / 347H Pipes & Tubes please call +91-22-66362223 / 66394926 or send an email to export@aashishmetal.com
FAQs - Stainless Steel 347 Pipe
SS 347 and SS 347H are both columbium-stabilized austenitic stainless steels. The key difference is carbon content: SS 347 has a maximum of 0.08% carbon, while SS 347H has a controlled carbon range of 0.04–0.10%. This higher carbon in 347H significantly improves creep and stress-rupture strength at temperatures above 600°C, making 347H the preferred grade for high-temperature service in boilers, superheaters, and furnace components. For corrosion-resistant welded structures at moderate temperatures, standard 347 is typically sufficient.
At Aashish Metal & Alloys, SS 347 seamless pipes are available from 1/8″ NB to 24″ NB (6mm OD to 914.4mm OD) with wall thicknesses ranging from SCH 5S to SCH XXS (approximately 0.3mm to 50mm wall). OD-sized seamless tubes are available from 6mm to 914.4mm. For sizes outside standard stock, we accept custom orders with typical lead times of 4–8 weeks depending on complexity.
Yes. We supply IBR (Indian Boiler Regulations) approved SS 347H boiler tubes compliant with the requirements of the Indian Boiler Act. IBR Test Certificates in Form III-D are provided with every consignment of IBR-approved material. Third-party inspection by IBR-approved inspection agencies can also be arranged on request.
Absolutely. We specialize in custom-size manufacturing for project-specific requirements. Whether you need a specific OD, wall thickness, length, end condition, or surface finish not listed in our standard stock, our manufacturing facility can accommodate your requirements. Please share your complete technical specification, and our engineering team will provide a detailed quotation within 24 hours.
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