347H Stainless Steel Pipe–High Temperature Stainless Steel Pipe Specifications, Properties and Industrial Applications

347H stainless steel pipe is a high carbon niobium-stabilized austenitic stainless steel pipe designed for elevated temperature service. Compared with standard 347 stainless steel, the “H” grade contains a higher carbon content, which improves creep strength and high temperature mechanical performance. Because of these characteristics, 347H stainless steel pipes are widely used in high temperature pressure systems and thermal processing equipment.

347H stainless steel pipe is especially suitable for long-term service in environments where temperatures remain above 500°C. The addition of niobium stabilizes the material structure and prevents chromium carbide precipitation, reducing the risk of intergranular corrosion during welding and prolonged heat exposure.

Important characteristics of 347H stainless steel pipe include:

1 excellent creep strength at elevated temperatures
2 strong resistance to intergranular corrosion
3 stable structure in long term high temperature environments
4 good weldability for pressure piping systems
5 reliable performance in petrochemical and refinery equipment

As a global manufacturer, Womic Steel supplies high quality 347H stainless steel pipes for demanding industrial projects.

347H stainless steel pipes are produced according to international specifications that define chemical composition, heat treatment requirements, mechanical properties, and inspection procedures. These standards ensure that the pipes can be safely used in pressure equipment and high temperature pipelines.

Common manufacturing standards include:

1 ASTM A312 for pressure piping systems
2 ASTM A213
3 ASTM A269
4 EN 10216-5
5 EN 10217-7

These international standards guarantee consistent quality for industrial piping systems.

347H stainless steel pipe has several equivalent material designations used in different regions and standards.

These equivalent grades allow global engineering projects to specify compatible materials according to regional codes.

347H stainless steel contains niobium as a stabilizing element to prevent carbide precipitation and improve high temperature performance.

Important metallurgical functions include:

1 chromium providing corrosion resistance
2 nickel improving toughness and ductility
3 niobium stabilizing the steel structure
4 higher carbon improving creep resistance

This composition provides excellent stability during high temperature service.

347H stainless steel pipes provide enhanced strength at elevated temperatures compared with standard austenitic stainless steels.

Key mechanical advantages include:

1 strong creep resistance at high temperatures
2 stable mechanical performance under pressure
3 excellent structural strength for industrial piping systems
4 reliable weld performance for fabrication

347H stainless steel pipe provides strong corrosion resistance combined with excellent heat resistance. The niobium stabilization prevents chromium carbide precipitation during welding and high temperature exposure.

Key resistance characteristics include:

1 strong resistance to intergranular corrosion
2 good resistance to oxidation up to 900°C
3 improved resistance to thermal fatigue
4 stable performance in high temperature refinery equipment
5 durability in petrochemical processing systems

These properties make 347H stainless steel suitable for long term high temperature service.

347H stainless steel pipes can be produced using seamless pipe manufacturing or welded pipe fabrication methods depending on project requirements.

Seamless Pipe Production

Typical seamless pipe manufacturing procedures include:

1 stainless steel billet inspection
2 billet heating in high temperature furnaces
3 rotary piercing to produce hollow tube shells
4 hot rolling or extrusion
5 cold drawing or cold rolling
6 solution annealing heat treatment
7 straightening and cutting
8 final dimensional inspection

Welded Pipe Production

Welded stainless steel pipes are manufactured through:

1 stainless steel coil preparation
2 roll forming into pipe shapes
3 automatic TIG or laser welding
4 weld seam heat treatment
5 pickling and passivation
6 dimensional calibration
7 nondestructive testing

Womic Steel uses advanced stainless steel pipe production technology and strict quality control systems.

347H stainless steel pipes are available in a wide range of sizes to meet different engineering requirements.

Typical production capability includes:

Additional manufacturing services include:

1 customized pipe length production
2 project specific pipe dimensions
3 large diameter stainless steel pipe fabrication

347H stainless steel pipes are manufactured according to ASME pipe schedule classifications that determine the wall thickness and pressure capacity.

Common pipe schedules include:

1 SCH 5
2 SCH 10
3 SCH 20
4 SCH 40
5 SCH 80
6 SCH 160

Engineers select appropriate pipe schedules based on pressure ratings and piping system design requirements.

Surface finishing improves corrosion resistance and surface cleanliness of stainless steel pipes.

Common finishing options include:

1 pickled and passivated surface
2 bright annealed surface
3 mechanically polished finish
4 sand blasted industrial surface

These finishing treatments ensure high quality surface condition and long term corrosion protection.

Strict inspection and testing procedures are performed during production to guarantee product reliability.

Typical inspection procedures include:

1 chemical composition analysis
2 mechanical property testing
3 hydrostatic pressure testing
4 ultrasonic testing
5 eddy current inspection
6 PMI positive material identification
7 dimensional tolerance inspection

Womic Steel provides complete quality documentation including mill test certificates and third party inspection reports.

347H stainless steel pipes are widely used in high temperature industries where materials must maintain strength and corrosion resistance under extreme conditions.

Typical industrial applications include:

1 refinery furnace piping systems
2 petrochemical processing equipment
3 thermal power plant piping systems
4 high temperature heat exchanger systems
5 industrial boiler and superheater piping
6 chemical processing plants
7 aerospace and energy industry equipment

These applications require materials that maintain structural stability during long term exposure to high temperatures.

As a global supplier of stainless steel piping products, Womic Steel offers comprehensive manufacturing and supply capabilities.

Key advantages include:

1 Advanced stainless steel pipe production equipment
2 Strict quality inspection and testing systems
3 Wide range of pipe sizes and grades
4 Competitive pricing for international projects
5 Reliable delivery schedules and logistics support

With extensive experience supplying stainless steel pipes to international engineering projects, Womic Steel provides reliable piping solutions for customers worldwide.

Customized services. Rapid production. Global reach. We ensure your specific needs are fulfilled with precision and top-tier quality.

Website: www.womicstainless.com

Email:info@womicstainless.com

Tel/WhatsApp/WeChat:Victor: +86-15575100681 or Jack: +86-18390957568