Forged Pipe Fittings
F91 High Pressure Forged Tee is a forged piping component manufactured from ASTM A182 F91 alloy steel and used to form a 90-degree branch connection in high-temperature and high-pressure piping systems. Hongcheng manufactures and supplies F91 high pressure forged tees for supercritical and ultra-supercritical power plant main steam piping, reheated steam piping, refinery high-pressure process piping and hydrogen processing service.
Product Overview
F91 High Pressure Forged Tee is a forged piping component manufactured from ASTM A182 F91 alloy steel and used to form a 90-degree branch connection in high-temperature and high-pressure piping systems. Hongcheng manufactures and supplies F91 high pressure forged tees for supercritical and ultra-supercritical power plant main steam piping, reheated steam piping, refinery high-pressure process piping and hydrogen processing service.
ASTM A182 F91 is the forged alloy steel grade corresponding to the 9Cr-1Mo-V-Nb alloy system, typically used in conjunction with ASTM A335 P91 seamless pipe and ASTM A234 WP91 butt-welding fittings. Each product form is controlled by its respective ASTM / ASME material specification.
Hongcheng supplies F91 high pressure forged tees with heat treatment performed in accordance with applicable material specifications and purchaser requirements. Full material traceability, inspection documentation and project-specific technical support are available. Custom wall thickness transitions and end preparations can be supplied according to project drawings and specifications.
Material & Heat Treatment
F91 alloy steel contains Chromium (Cr), Molybdenum (Mo), Vanadium (V), Niobium (Nb), Manganese (Mn), Silicon (Si) and Carbon (C) within the limits specified by ASTM A182.
Chromium, molybdenum and vanadium contribute to the material's elevated-temperature mechanical properties and creep strength. Material suitability for specific service conditions, including hydrogen service, depends on operating conditions, design requirements and applicable project specifications.
Heat treatment is performed according to the applicable ASTM A182 requirements, qualified manufacturing procedures and purchaser specifications. Typical processing includes normalizing, tempering and other treatments specified by the material grade and applicable standard. Actual heat-treatment conditions depend on the applicable material specification, product size, forging process and project requirements.
Manufacturing Process
Raw Material Inspection → Cutting → Forging → Heat Treatment → Machining → Inspection & Testing → Marking → Packing
Forged construction is supplied according to product size, pressure class, manufacturing route and applicable specifications. Hongcheng controls forging accuracy, heat treatment, dimensional tolerances and inspection throughout the manufacturing process to meet applicable standards and purchaser specifications.
Technical Parameters
|
Parameter |
Specification |
|
Product |
F91 High Pressure Forged Tee |
|
Material Standard |
ASTM A182 / ASME SA182 |
|
Material Grade |
F91 (9Cr-1Mo-V-Nb) |
|
Pressure Class |
2000#, 3000#, 6000# and Custom |
|
Size Range |
NPS 1/2–4 (DN15–DN100), subject to size, applicable standard and manufacturing capability |
|
End Types |
Threaded (NPT), Socket Weld |
|
Dimensional Standard |
ASME B16.11 where applicable |
|
Heat Treatment |
According to applicable ASTM A182 requirements |
|
Surface |
Black Painted / Anti-Rust Oil / Natural Finish |
|
MTC |
EN 10204 3.1 available |
|
Customization |
Custom Wall Thickness, End Preparation and Marking Available |
Inspection & Testing
Inspection and testing are performed according to ASTM A182, applicable dimensional standards and purchaser requirements.
Available inspection and testing services may include:
EN 10204 Type 3.1 Material Test Certificates (MTC) can be provided according to purchase requirements. Third-party inspection and additional NDT are available upon request.
Applications
F91 high pressure forged tees are commonly used in:
• Supercritical and Ultra-Supercritical Power Plant Main Steam Piping
• Reheated Steam Piping
• Refinery High-Pressure Process Piping
• Hydrogen Processing and High-Temperature Process Service
• Petrochemical High-Temperature Reactors
• High-Pressure Utility Boiler Systems
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Projects of Forged Pipe Fittings
Power Plant Projects
Products: P91 Pipes · P92 Pipes · Pipe Fittings · Pipe Spools
FAQs
What is the difference between F91 forged tees and WP91 butt-welding tees?
F91 and WP91 refer to related grades within the same 9Cr-1Mo-V-Nb alloy system, but they are specified under different ASTM product standards. ASTM A182 F91 is used for forged fittings, while ASTM A234 WP91 is used for wrought butt-welding fittings. They are commonly specified together in high-temperature and high-pressure piping systems.
Are F91 forged tees suitable for hydrogen service?
Material suitability for hydrogen service depends on operating conditions, design requirements, material compatibility and applicable project specifications. The selected grade should be confirmed against the applicable design code and project specifications.
What post-weld heat treatment is required for F91 forged tees?
PWHT may be required depending on the applicable construction code, wall thickness, welding procedure and project requirements. Where welding is required, F91 forged tees should be welded using qualified procedures with preheating and PWHT applied as required by the applicable code and project specifications.
What pressure classes are available?
F91 high pressure forged tees are typically supplied in pressure classes 2000#, 3000# and 6000# for socket-weld and threaded configurations according to ASME B16.11, subject to size and project requirements.
What standards are supported?
F91 high pressure forged tees are manufactured from ASTM A182 / ASME SA182 F91 alloy steel. Dimensional requirements may follow ASME B16.11 where applicable, while material, forging, heat treatment and inspection requirements are controlled according to the applicable product specification and project requirements.
Wuliyao Industrial Zone, Yanshan County, Cangzhou City, Hebei Province, China.
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