ASTM A182 F91 Flange,A182 F91 Weld neck Flange,slip on Flange,A 182 F91 Blind Flange
We are a professional manufacturer of steel forged CHROME MOLY ALLOY STEEL A182 F91 flange in China, A182 F91 Blind flange,A182 F91 weld neck flange,ANSI B16.5 A182 F91 Slip on Flange
ASTM A182 F91 Flange Manufacturer in China | A182 F91 Weld Neck, Slip On & Blind Flanges
We are a professional manufacturer and exporter of ASTM A182 F91 Chrome Moly Alloy Steel Flanges in China, supplying high-quality A182 F91 Weld Neck Flanges, A182 F91 Slip On Flanges, and A182 F91 Blind Flanges for high-temperature and high-pressure piping systems worldwide.
Our forged ASTM A182 F91 flanges are widely used together with A335 P91 Seamless pipesand A234 WP91 Pipe fittings in power plants, petrochemical plants, refineries, boilers, and pressure piping systems.
What Is ASTM A182 F91 Flange?
ASTM A182 F91 flange is a forged chromium-molybdenum alloy steel flange designed for high-temperature service applications. ASTM A182 covers forged or rolled alloy steel pipe flanges, forged fittings, valves, and related components intended for elevated temperature environments.
A182 F91 is a specification for forged or rolled alloy-steel pipe flanges, forged fittings, and valves and parts intended for high-temperature service. F91 specifically refers to a grade of chromium-molybdenum alloy steel.
A182 F91 is a high-strength, high-temperature resistant pipe fitting made from 9% Chromium-1% Molybdenum alloy steel
- High temperature strength
- Creep resistance
- Oxidation resistance
- Corrosion resistance
- Long-term thermal stability
ASTM A182 F91 flanges are commonly used in critical piping systems where high pressure and elevated temperatures are present.
Equivalent Grades:
- ASTM A335 P91
- ASTM A234 WP91
- ASTM A213 T91
- UNS K90901
- X10CrMoVNb9-1
- EN 1.4903
ASTM A182 F91 Flange Product Range
We manufacture and supply:
- ASTM A182 F91 Weld Neck Flanges
- ASTM A182 F91 Slip On Flanges
- ASTM A182 F91 Blind Flanges
- ASTM A182 F91 Threaded / Screwed Flanges
- ASTM A182 F91 Socket Weld Flanges
- ASTM A182 F91 Lap Joint Flanges
- ASTM A182 F91 Spectacle Blind Flanges
- Custom Forged F91 Flanges
ASTM A182 F91 Flange Specifications
Material Standard
- ASTM A182 / ASME SA182 F91
Flange Standards
- ANSI B16.5
- ANSI B16.47 Series A & B
- MSS SP-44
- API 605
- AWWA
- DIN
- EN
- BS
- Custom Drawings
Size Range
- 1/4″ NB to 60″ NB
Pressure Ratings
- Class 150
- Class 300
- Class 600
- Class 900
- Class 1500
- Class 2500
- PN6 / PN10 / PN16 / PN25 / PN40
Flange Face Types
- Raised Face (RF)
- Flat Face (FF)
- Ring Type Joint (RTJ)
Manufacturing Type
- Forged
- Heat Treated
- CNC Machined
ASTM A182 F91 Chemical Composition (%)
| Element | A182 F91 |
|---|---|
| Carbon | 0.08-0.12 |
| Manganese | 0.30-0.60 |
| Phosphorus | ≤0.020 |
| Sulfur | ≤0.010 |
| Silicon | 0.20-0.50 |
| Chromium | 8.0-9.5 |
| Molybdenum | 0.85-1.05 |
| Columbium (Nb) | 0.06-0.10 |
| Vanadium | 0.18-0.25 |
| Nitrogen | 0.03-0.07 |
| Nickel | ≤0.40 |
| Aluminum | ≤0.02 |
| Titanium | ≤0.01 |
| Zirconium | ≤0.01 |
ASTM A182 F91 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥90 ksi [620 MPa] |
| Yield Strength | ≥60 ksi [415 MPa] |
| Elongation | ≥20% |
| Reduction of Area | ≥40% |
| Brinell Hardness | 190-248 HBW |
ASTM A182 F91 Heat Treatment
ASTM A182 F91 forged flanges shall undergo normalize and temper heat treatment to achieve the required mechanical properties.
Heat Treatment Process
- Normalizing Temperature: 1900-1975°F (1040-1080°C)
- Cooling Method: Air Cooling
- Tempering Temperature: 1350-1470°F (730-800°C)
This heat treatment process ensures superior creep resistance and high-temperature performance.
ASTM A182 F91 Hardness Requirement
- Brinell Hardness Number (HBW): 190-248
According to NACE MR0175 requirements, maximum hardness shall not exceed 237 HBW when specified.
Applications of ASTM A182 F91 Flanges
ASTM A182 F91 flanges are extensively used in:
- Thermal Power Plants
- Supercritical & Ultra-supercritical Boilers
- Petrochemical Plants
- Oil & Gas Industry
- Steam Pipelines
- Pressure Vessels
- Heat Exchangers
- Refineries
- High Temperature Piping Systems
Why Choose Our ASTM A182 F91 Flanges?
- Professional forged flange manufacturer in China
- Factory direct competitive prices
- Strict quality inspection system
- Advanced forging and CNC machining equipment
- Full EN 10204 3.1 / 3.2 certification
- PMI, UT, RT, hardness testing available
- Fast delivery for standard sizes
- OEM & custom dimensions accepted
- Export experience to Europe, Middle East, Southeast Asia, and South America
Inspection & Testing
All ASTM A182 F91 flanges can be supplied with:
- Positive Material Identification (PMI)
- Ultrasonic Testing (UT)
- Radiographic Testing (RT)
- Hardness Testing
- Dimensional Inspection
- Magnetic Particle Examination (MT)
- Liquid Penetrant Testing (PT)
Third-party inspection is available upon request.
Packing & Documentation
Packing
- Fumigation-free wooden cases
- Export seaworthy packing
- Customized packing available
Documents
- EN 10204 3.1 MTC
- EN 10204 3.2 Certification
- Heat Treatment Reports
- PMI Reports
- NDT Reports
How to Order ASTM A182 F91 Flanges?
Example:
6″ ASTM A182 F91 Weld Neck Flange, Class 600, RF, ANSI B16.5, SCH160 Bore
When sending inquiries, please specify:
- Flange Type
- Size
- Pressure Class
- Face Type
- Material Grade
- Quantity
- Standard
- Inspection Requirements
Contact us today for the latest price and technical support for ASTM A182 F91 alloy steel flanges.
