ASTM A694 F65 Weld Neck Flanges Manufacturer
ASTM A694 F65 Weld Neck Flanges – High-Strength Carbon Steel Flanges
Our F65-grade flanges are engineered for high-pressure transmission systems in the oil and gas, petrochemical, and power generation industries. Manufactured from high-strength carbon steel, these flanges provide superior toughness and durability under extreme service conditions.
ASTM A694 Standard Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings,Valves, and Parts for High-Pressure Transmission Service
Download ASTM A694 pdf
F65 refers to the Forging material with 65 KSI yield strength.
Also there are F42 F48,F50F52.F56,F60,F70 grade in this specification of ASTM A694
Mechinical properties of ASTM A694 F65
The mechanical properties of grade A694 F65 Flange are displayed in the following table.
| ASTM A694 Grade | Yield Strength min. | Tensile Strength min. | Elongation min. | ||
| MPa | ksi | MPa | ksi | % | |
| A694 F65 FLANGES | 450 | 65 | 530 | 77 | 20 |
Chemical Composition of ASTM A694 F65
TABLE 2 Chemical Requirements of ASTM A694 F65
| elements | Composition, % |
|---|---|
| Heat Analysis | |
| Carbon, max | 0.30 |
| Manganese, max | 1.60 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon | 0.15–0.35 |
| CopperA | |
| NickelA | |
| ChromiumA | |
| MolybdenumA | |
| VanadiumA | |
| Columbium (Niobium)A | |
| BoronA |
All elements listed in Table 2 shall be reported. Where no composition limit is listed, values are to be reported but no limits apply except as covered in 6.3.
ASTM A694 F65 Weld Neck Flange specification
Material Grade: ASTM A694 F65 High Yield steel with Min 65 KSI yield strength
Flange Type: Weld Neck Flange
Pressure Ratings: Available in ANSI/ASME B16.5 Class 150 to 2500
Sizes: 1/2″ to 60″ (custom sizes available on request)
Standards: ANSI/ASME B16.5, MSS-SP-44, API 6A (as applicable)
Other Flange type available:Slip on,Blind Flange
Hardness Requirement of ASTM A694 F65 Flanges
- Maximum Hardness:
The specification does not prescribe a specific hardness number, but typically for Grade F65 Accoridng to NACE MR0175- Hardness should not exceed 235 HBW (Brinell Hardness)This corresponds approximately to:
- ~22 HRC (Rockwell C)
- Hardness should not exceed 235 HBW (Brinell Hardness)This corresponds approximately to:
Heat Treatment Requirement of ASTM A694 F65 Flanges
ASTM A694 F65 flanges must be heat treated to achieve the required mechanical properties:
- Normalizing, Quenching, and Tempering:
- Forging Temperature: The forging temperature range is 900 ~ 1200℃. Soak time should be minimized to avoid heavy scaling but sufficient for the center to reach the furnace temperature.
- Normalizing: Heat to 890 ~ 960℃ for a time commensurate with the ruling section, then air – cool.
- Hardening (Quenching): Heat to 890 ~ 960℃ for a time appropriate for the ruling section and quench in water.
- Tempering: Re – heat to 540 ~ 650℃, hold for a time corresponding to the ruling section, and cool in still air. All grades of ASTM A694 must be heat – treated. For carbon steel and high – strength low – alloy steel (including F65), heat treatment may include normalizing, normalizing – and – tempering, or quenching – and – tempering. The tempering temperature is at least 540℃ (1000°F).
Charpy V-Notch Impact Test (CVN) of ASTM A694 F65
- Required if specified by the purchase order or requirements of MSS SP-44,
- chemical requirements, carbon equivalency, and impact testing limitations are required by MSS SP-44
- Usually conducted at a specified temperature (e.g., -46°C for low-temperature service).
- Minimum energy values must be met (commonly 27 J average, 20 J minimum single value per specimen).
ASTM A694 F65 Flange Manufacturer & Supplier in China
We are a leading manufacturer of ASTM A694 F65 high-yield carbon steel flanges, engineered for high-pressure piping applications in oil, gas, and petrochemical systems. Our product range includes weld neck, blind, and slip-on flanges with full compliance to ASME, ANSI, and API standards.
All flanges are:
- Heat treated (normalizing or quenching + tempering)
- Supplied with EN 10204 3.1 / 3.2 certificates
- 100% inspected via ultrasonic or magnetic particle testing
- Suitable for sour service (NACE MR0175) upon request
Looking for a reliable and high – performance ASTM A694 F65 Flange?Pls contact us freely.
Learn more about ASTM A694 / A694M F52,F60,F65,F70 Flanges Specification
Download ASTM A694 F65 Flange specification
