ASTM A336 Grade F1,F11,F12,F5,F9,F22,F91 Forged Flanges specification
ASTM A336
Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature Parts
ASTM A336 / A336M covers alloy steel forgings intended for use in pressure-containing and high-temperature service.
The specification applies to forged components such as:
-
Valves and valve parts
-
Flanges:Weld neck flange.Blind flange,slip on flange,Long weld neck flanges,
- Forged Elbow,Tee.Weldolet,threadolet
-
Pressure vessel components
-
High-temperature and high-pressure piping parts
This specification covers ferritic steel forgings for boilers, pressure vessels, high-temperature parts, and associated equipment. 1.2 Forgings made of steel grades listed in Specification A 335/A 335M, may also be ordered under this specification. The chemical, tensile, heat treatment, and marking requirements of Specification A 335/A 335M shall apply, except the forging shall conform to the chemical requirements of Tables 1 and 2 of Specification A 335/A 335M only with respect to heat analysis. On check analysis they may deviate from these limits to the extent permitted in Table 1 of this specification.
| (Current） | （Formerly） |
|---|---|
| Grade F1 | Class F1 |
| Grade F11, Class 2 | Class F11 |
| Grade F11, Class 3 | Class F11A |
| Grade F11, Class 1 | Class F11B |
| Grade F12 | Class F12 |
| Grade F5 | Class F5 |
| Grade F5A | Class F5A |
| Grade F9 | Class F9 |
| Grade F6 | Class F6 |
| Grade F21, Class 1 | Class F21A |
| Grade F21, Class 3 | Class F21 |
| Grade F22, Class 1 | Class F22A |
| Grade F22, Class 3 | Class F22 |
| Grade F91 | Class F91 |
| Grade F3V | Class F3V |
| Grade F22V | Class F22V |
Referenced Documents
ASTM Standards:
A 275/A 275M Test Method for Magnetic Particle Examination of Steel Forgings
A 335/A 335M Specification for Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
A 788 Specification for Steel Forgings, General Requirements
A 965 Specification for Steel Forgings, Austenitic, for Pressure and High Temperature Parts
E 165 Test Method for Liquid Penetrant Examination
Other Standard: ASME Boiler and Pressure Vessel Code, Section IX, Welding Qualifications4 3. Ordering Informati
Tensile strength
| Class | Tensile strength（psi） | Tensile strength（MPa） |
|---|---|---|
| F1 | 70,000 – 95,000 psi | 485 – 660 MPa |
| F11 | 70,000 – 95,000 psi (Class 2)75,000 – 100,000 psi (Class 3)60,000 – 85,000 psi (Class 1) | 485 – 660 MPa515 – 690 MPa415 – 585 MPa |
| F12 | 70,000 – 95,000 psi | 485 – 660 MPa |
| F5 | 60,000 – 85,000 psi | 415 – 585 MPa |
| F9 | 85,000 – 110,000 psi | 585 – 760 MPa |
| F22 | 75,000 – 100,000 psi (Class 3)60,000 – 85,000 psi (Class 1) | 515 – 690 MPa415 – 585 MPa |
| F91 | 85,000 – 110,000 psi | 585 – 760 MPa |
Heat Treatment
The steel forgings shall be annealed or normalized and tempered but alternatively may be liquid quenched and tempered when mutually agreed upon between the manufacturer and the purchaser. Grade F22V forgings shall be normalized and tempered or liquid quenched and tempered. For Grade F22V forgings the minimum austenizing temperature shall be 1650°F [900°C]. For Grade F91 and F911 forgings the austenitizing temperature shall be in the range of 1900 to 2000°F [1040 to 1095°C]. Normalizing or liquid quenching shall be followed by tempering at a subcritical temperature. The minimum tempering temperature shall be 1100°F [595°C],
| Grade | Minimum Tempering Temperature |
|---|---|
| F6 | 1150 °F (620 °C) |
| F11, Class 2 | 1150 °F (620 °C) |
| F11, Class 3 | 1150 °F (620 °C) |
| F11, Class 1 | 1150 °F (620 °C) |
| F5 | 1250 °F (675 °C) |
| F9 | 1250 °F (675 °C) |
| F21, Class 1 | 1250 °F (675 °C) |
| F3V / F3VCb | 1250 °F (675 °C) |
| F22, Class 1 | 1250 °F (675 °C) |
| F22V | 1250 °F (675 °C) |
| F91 | 1350 °F (730 °C) |
| F911 | 1350 °F (730 °C) |
Chemical composition
| Element | F1 | F11 | F12 | F5 | F9 | F22 | F91 |
|---|---|---|---|---|---|---|---|
| Carbon (C) | 0.20–0.30 | 0.10–0.20 | 0.10–0.20 | 0.15 max | 0.15 max | 0.05–0.15 | 0.08–0.12 |
| Manganese (Mn) | 0.60–0.80 | 0.30–0.80 | 0.30–0.80 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 |
| Phosphorus (P), max | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 |
| Sulfur (S), max | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 |
| Silicon (Si) | 0.20–0.35 | 0.50–1.00 | 0.10–0.60 | 0.50 max | 0.50–1.00 | 0.50 max | 0.20–0.50 |
| Nickel (Ni) | — | — | — | 0.50 max | — | — | 0.40 max |
| Chromium (Cr) | — | 1.00–1.50 | 0.80–1.10 | 4.0–6.0 | 8.0–10.0 | 2.00–2.50 | 8.0–9.5 |
| Molybdenum (Mo) | 0.40–0.60 | 0.45–0.65 | 0.45–0.65 | 0.45–0.65 | 0.90–1.10 | 0.90–1.10 | 0.85–1.05 |
| Vanadium (V) | — | — | — | — | — | — | 0.18–0.25 |
| Niobium (Cb/Nb) | — | — | — | — | — | — | 0.06–0.10 |
| Nitrogen (N) | — | — | — | — | — | — | 0.03–0.07 |
| Aluminum (Al) | — | — | — | — | — | — | 0.04 max |
Testing & Inspection Requirements
ASTM A336 requires extensive quality testing, including:
-
Chemical composition analysis
-
Tensile test
-
Impact test (when specified)
-
Hardness test
-
Ultrasonic testing (UT)
-
Visual and dimensional inspection
-
Heat treatment verification
Supplementary Requirements (Optional)
When specified by the purchaser:
-
Charpy V-notch impact testing
-
Magnetic particle or liquid penetrant testing
-
Additional UT acceptance criteria
-
Special marking
-
Grain size control
Marking & Certification
Each forging must be marked with:
-
ASTM A336 / A336M
-
Grade designation (F1, F22, F91, etc.)
-
Heat number
-
Manufacturer identification
Certification:
-
EN 10204 3.1 (standard)
-
EN 10204 3.2 (if third-party inspection is required)
