ASTM A403 WP 347 Stainless Steel Buttweld Fittings are high temperature resistant chromium-nickel stainless steel fittings stabilized with columbium (niobium) to prevent carbide precipitation during welding. These fittings are used extensively in petrochemical, power generating, refinery, heat exchanger and chemical processing sectors. Common items are SS 347 Elbow, tee, reducer, stub end, cap and pipe bend in accordance with ASME B16.9, MSS SP-43 and ASTM A403 WP347 class 1.
347 Stainless Steel Pipe Fittings
We are one of the best Stainless Steel 347 Pipe Fittings Manufacturer who supplies buttweld fittings of high quality for critical industrial applications that require good resistance to intergranular corrosion and high-temperature oxidation. The ASTM A403 WP 347 Stainless Steel Buttweld Fittings offered by us are made utilizing the best quality raw materials. They are available in seamless, welded and fabricated forms.
SS 347 is an austenitic stainless steel stabilized with Niobium. It is excellent for high temperature duty where resistance to carbide precipitation is necessary. These fittings provide solid mechanical strength, excellent weldability and long service life in corrosive situations.
We are a leading SS 347 buttweld fittings manufacturer in Mumbai and supply in various schedules, wall thickness and bespoke dimensions as per the international standards.
Table of Contents
- ➤ What are ASTM A403 WP347 Stainless Steel Buttweld Fittings?
- ➤ Features of SS 347 Buttweld Fittings
- ➤ Types of Stainless Steel 347 Buttweld Fittings
- ➤ UNS S34700 Buttweld Pipe Fittings Material Specification
- ➤ Chemical Composition of ASTM A403 WP347 Class 1
- ➤ Mechanical Properties of SS 347 Pipe Fittings
- ➤ Dimensions of ASTM A403 WP347 Stainless Steel Buttweld Fittings
- ➤ Weight Chart of Stainless Steel 347 Pipe Fittings
- ➤ Applications of ASTM A403 WP347 Buttweld Fittings
- ➤ Manufacturing Process of Stainless Steel 347 Pipe Fittings
- ➤ Why Choose Us for Stainless Steel 347 Pipe Fittings?
What are ASTM A403 WP347 Stainless Steel Buttweld Fittings?
ASTM A403 WP347 Class 1 Fittings are wrought stainless steel buttweld fittings for pressure piping and high temperature use. The grade contains chromium, nickel and niobium that improve the creep resistance and oxidation resistance.
These fittings are extensively used in:
- Petrochemical plants
- Oil & gas processing units
- Refineries
- Fertilizer industries
- Heat exchangers
- Power plants
- Offshore pipelines
- Food processing systems
The addition of niobium helps stabilize the alloy against chromium carbide precipitation during welding operations, making it ideal for welded structures operating at high temperatures.
Features of SS 347 Buttweld Fittings
- Excellent resistance to intergranular corrosion
- Superior oxidation resistance at elevated temperatures
- Good mechanical strength and creep resistance
- Excellent weldability without post-weld annealing
- Suitable for high-pressure applications
- Reliable performance in corrosive environments
- Available in seamless and welded construction
- Long operational life with minimal maintenance
Types of Stainless Steel 347 Buttweld Fittings
➤ SS 347 Elbow
SS 347 elbow fittings are used to alter pipeline direction at angles of 45°, 90°, and 180°. These fittings ensure smooth flow while maintaining pressure integrity in high-temperature systems.
➤ SS 347 Reducer
We offer concentric and eccentric SS 347 Reducer fittings that are used to join pipes of varying sizes while maintaining optimal flow control.
➤ SS 347 Pipe Bend
As a reputable SS 347 Reducer/Pipe Bend manufacturer, we offer custom pipe bends for long-radius flow applications in industrial piping systems.
➤ Other Available Products
- Equal Tee
- Reducing Tee
- Stub End
- Pipe Cap
- Cross Tee
- Return Bend
- Long Radius Bend
- Short Radius Elbow
NACE MR0175 Compliant SS 347 Buttweld Fittings
Our NACE MR0175 compliant ss 347 buttweld fittings are manufactured for sour gas and hydrogen sulfide environments commonly found in oil & gas industries. These fittings undergo strict quality testing to ensure corrosion resistance, hardness control, and material integrity for critical applications.
Available testing includes:
- Positive Material Identification (PMI)
- Intergranular Corrosion Test (IGC)
- Radiography Test
- Ultrasonic Test
- Hydrostatic Test
- Hardness Test
- Third Party Inspection
UNS S34700 Buttweld Pipe Fittings Material Specification
| Specification | Details |
|---|---|
| Material Grade | Stainless Steel 347 |
| UNS Number | UNS S34700 |
| Werkstoff Number | DIN 1.4550 |
| ASTM Standard | ASTM A403 WP347 |
| ASME Standard | ASME SA403 WP347 |
| Type | Seamless / Welded / Fabricated |
| Pressure Rating | SCH 10 to SCH XXS |
| Size Range | ½” NB to 48” NB |
| Standard | ASME B16.9, B16.28, MSS SP-43 |
| Form | Elbow, Tee, Reducer, Cap, Bend |
| Testing | PMI, IGC, Hydro, UT, RT |
| Compliance | NACE MR0175 compliant ss 347 buttweld fittings |
Chemical Composition of ASTM A403 WP347 Class 1
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 13.00 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Columbium + Tantalum | 10xC min – 1.00 max |
| Iron (Fe) | Balance |
Mechanical Properties of SS 347 Pipe Fittings
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 35% min |
| Hardness | 201 HB max |
| Melting Point | 1400°C – 1450°C |
Weight Chart of Stainless Steel 347 Pipe Fittings
90 Degree Long Radius Elbow Weight Chart
| Size | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|
| 1/2" | 0.05 kg | 0.08 kg | 0.12 kg |
| 1" | 0.12 kg | 0.18 kg | 0.28 kg |
| 2" | 0.45 kg | 0.68 kg | 1.05 kg |
| 4" | 1.85 kg | 2.75 kg | 4.10 kg |
| 6" | 4.50 kg | 6.30 kg | 9.80 kg |
Dimensions of ASTM A403 WP347 Stainless Steel Buttweld Fittings
90 Degree Elbow Dimensions
| NPS | Outside Diameter | Center to End |
|---|---|---|
| 1/2" | 21.3 mm | 38 mm |
| 1" | 33.4 mm | 38 mm |
| 2" | 60.3 mm | 76 mm |
| 4" | 114.3 mm | 152 mm |
| 6" | 168.3 mm | 229 mm |
DIN 1.4550 Stainless Steel Heavy Wall Fittings
DIN 1.4550 stainless steel heavy wall fittings are specifically intended for high-pressure, high-temperature industrial pipe systems. These fittings are designed with thicker wall sections for use in demanding applications that require strength and durability.
Heavy wall SS 347 fittings are commonly used in:
- Steam pipelines
- Boiler systems
- High-pressure process lines
- Thermal plants
- Chemical reactors
Their excellent creep strength and oxidation resistance make them suitable for continuous service at elevated temperatures.
Applications of ASTM A403 WP347 Buttweld Fittings
These fittings are widely used in industries where high temperature and corrosion resistance are essential.
- Oil & Gas Industry
- Petrochemical Plants
- Power Generation
- Fertilizer Industry
- Pharmaceutical Plants
- Heat Exchangers
- Offshore Platforms
- Chemical Processing Plants
- Pulp & Paper Industry
- Food Processing Units
Manufacturing Process of Stainless Steel 347 Pipe Fittings
The manufacturing process involves multiple stages to ensure dimensional accuracy and product reliability:
- Raw material inspection
- Cutting and forming
- Hot forging or cold forming
- Welding and shaping
- Heat treatment
- Machining and beveling
- Surface finishing
- Dimensional inspection
- Pressure and quality testing
- Packing and dispatch
Every fitting is produced according to international standards and customer specifications.
Why Choose Us for Stainless Steel 347 Pipe Fittings?
As an experienced Stainless Steel 347 Pipe Fittings Manufacturer, we focus on quality, reliability, and technical precision. Our products are manufactured under strict quality control procedures and supplied worldwide.
- Wide stock availability
- Competitive pricing
- Fast delivery schedules
- International quality standards
- Custom sizes available
- Export packaging solutions
- Third-party inspection support
- Technical assistance for material selection
Related Stainless Steel Fittings
- Stainless Steel 310 Buttweld Fittings
- Stainless Steel 310S Pipe Fittings
- Stainless Steel 316ti Buttweld Fittings
- Stainless Steel 410 Pipe Fittings
- Stainless Steel 446 Buttweld Fittings
- Stainless Steel 347 Pipe Fittings
- Stainless Steel 347H Pipe Fittings
Frequently Asked Questions
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