Description
SS 347 Seamless Pipe / 1.4550 / UNS S34700 Pipes
SS 347 Seamless Pipe is an austenitic stainless steel grade containing chromium, nickel, and niobium. The addition of niobium helps stabilize the material and reduce chromium carbide precipitation under certain elevated-temperature conditions.
The chemical composition of Stainless Steel 347 is controlled by the applicable material standard.
Textron Steel and Alloys is a supplier of SS 347 Seamless Pipes for industrial applications requiring good corrosion resistance, high-temperature strength, and resistance to intergranular corrosion. Stainless Steel 347 is a niobium-stabilized austenitic stainless steel grade designed for applications involving elevated temperatures and exposure to corrosive environments.
Our SS 347 seamless pipes are suitable for industries such as oil and gas, petrochemical processing, chemical plants, power generation, refineries, and heat exchangers. These pipes are manufactured without a welded seam, making them suitable for applications where consistent pipe integrity and reliable performance are important.
We supply Stainless Steel 347 Seamless Pipes in different sizes, schedules, and specifications as per customer requirements, subject to availability.
SS 347 Chemical Composition :
| Elements | Min. | Max. |
| C | – | 0.08 |
| Si | – | 1.00 |
| Mn | – | 2.00 |
| P | – | 0.040 |
| S | – | 0.015 |
| Cr | 17.00 | 19.00 |
| Nb | 10xC | 1.00 |
| Ni | 9.00 | 12.00 |
Applications of SS 347 Seamless Pipes :
SS 347 seamless pipes are commonly used in:
- • Oil and gas processing plants
- • Petrochemical and chemical industries
- • Refineries and process piping systems
- • Power generation facilities
- • Heat exchangers and selected boiler applications
- • High-temperature industrial equipment
- • Aerospace and specialized engineering applications
- • Pressure piping systems designed for suitable service conditions
The final material selection should be based on design temperature, pressure, corrosion exposure, and the relevant engineering code.
Difference Between SS 347 and SS 347H Seamless Pipes :
SS 347 and SS 347H are related niobium-stabilized austenitic stainless steel grades, but they are not interchangeable in every application.
SS 347 is commonly selected for corrosion resistance and service involving elevated temperatures. SS 347H is a higher-carbon variant intended for applications where the specified high-temperature strength requirements make that grade appropriate.
The choice between these grades depends on design temperature, pressure, creep considerations, applicable piping codes, and project specifications. Always confirm whether the requirement is ASTM A312 TP347 or TP347H before placing an order.
SS 347 Seamless Pipes for Oil and Gas Industries :
Oil and gas facilities use stainless steel piping in applications where material reliability, corrosion performance, and operating temperature must be carefully controlled.
SS 347 seamless pipes may be selected for appropriate process lines, high-temperature systems, and equipment connections when the engineering specification identifies this grade as suitable.
Material selection should consider pressure, temperature, fluid composition, corrosion mechanisms, and the applicable industry codes. The grade and product specification should be verified before procurement.
SS 347 Seamless Pipes for Chemical and Petrochemical Plants :
Chemical and petrochemical plants often require piping materials that can withstand demanding operating conditions. SS 347 offers a combination of austenitic stainless steel properties and niobium stabilization, making it useful in selected process applications.
These pipes may be considered for suitable chemical processing lines, refinery systems, heat-transfer equipment, and related industrial installations. Actual corrosion resistance depends on the chemicals handled, concentration, temperature, and exposure conditions.
Before selecting SS 347, the material should be checked against the plant’s corrosion data and piping specification.
SS 347 Seamless Pipes for Power Plants and Heat Exchangers :
Power generation facilities and heat-transfer systems may operate at elevated temperatures and pressures. SS 347 is used in selected applications where its high-temperature properties and stabilization characteristics meet the design requirements.
Depending on the engineering specification, these applications may include process piping, heat-transfer equipment connections, and certain elevated-temperature service systems.
The correct pipe standard, dimensions, mechanical properties, inspection requirements, and heat treatment condition should be established before procurement.
