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ASTM A694 Flanges(F42,F46,F48,F50,F52,F56,F60,F65,F70)
ASTM A694 / A694M Weld neck flange,slip on flange,blind flange,socket weld flange
| Name | ASTM A694 Flanges(F42,F46,F48,F50,F52,F56,F60,F65,F70) | ||||
| Type | WN(welding neck);SO(slip on);PL(Plate);BL(Blind);Th(Threaded);SW(scket welding);LF/SE(lapped flange/stub end);LWN(long welding neck);Orifice flange;Reducing flange;API flange;Integral/Compact flange;Spectacle blind,spade and spacer,Paddle blind,Paddle spacer; | ||||
| Production Size | 1/2''~120'' | ||||
| Face | RF(raised face);FF(flat face);RTJ(ring type joint);TG(tongue and groove face);MFF(male and female face) | ||||
| Standard | ANSI: ANSI B16.5, ANSI B16.47, ANSI B16.48, ANSI B16.36, ASME B16.5, API 6B, 6BX, BS4504 - 3.1, API608 - 81, ASMEB16.36; JIS B2220; DIN: DIN2630, 2631, 2632, 2633, 2634, 2635, 2636, 2637, 2638, 2501 (WN); DN2573, 2576, 2527, 2655, 2656 (PL); DIN2566 (TH) | ||||
ASTM A694 is the standard specification for carbon steel and alloy steel forgings including pipe flanges, fittings, valves and other piping components for high-pressure transmission service. The material can be categorized into several grades: ASTM A 694 Grade F42, F46, F48, F50, F52, F56, F60, F65 and F70. They are widely used in high-pressure oil and gas transmission pipelines as well as wellhead and manifold devices.
ASTM A694 forged flanges can be furnished in accordance with MSS SP 44, ASME B16.47(both Series A and Series B) and ASME B16.5. Although ASTM A694 is not endorsed by ASME B16.5 and ASME B16.47(which inherits the pressure-temperature ratings chart from B16.5), it is a common practice that most of world's prominent oil & gas companies such as BP, Shell, Saudi Aramco, PDO may specify a ASME B16.5 flange in ASTM A694 material in their rfq specification. ASTM A694 can be used in ASME B16.5 flanges as an unlisted material provided it conforms to a published specification covering chemistry, physical and mechanical properties, method and process of manufacture, heat treatment and quality control, and otherwise meet the requirements of ASME B31.3 where strict qualification calculation shall be conducted. API 6A flanges can also be made from ASTM A694 materials provided ASTM A694 material meets the requirements of API 6A(as specified in section 5.4).
2. Chemical composition requirements of ASTM A694 forged flanges
| Element | Product Analysis, % | Heat Analysis, % |
| Carbon (C) | 0.265 max. | 0.26 max. |
| Manganese (Mn) | 1.64 max. | 1.60 max. |
| Silicon (Si) | 0.10 ~ 0.40 | 0.15 ~ 0.35 |
| Phosphorus (P) | 0.030 max. | 0.025 max. |
| Sulfur (S) | 0.030 max. | 0.025 max. |
3. Mechanical requirements of ASTM A694 forged flanges
| Mechanical Properties (ASTM A694 Flanges) | |||
| ASTM A694 Grade | Tensile Strength min. | Yield Strength min. | Elongation min. |
| ksi (MPa) | ksi (MPa) | % | |
| F42 | 60 (415) | 42 (290) | 20 |
| F46 | 60 (415) | 46 (315) | 20 |
| F48 | 62 (425) | 48 (330) | 20 |
| F50 | 64 (440) | 50 (345) | 20 |
| F52 | 66 (455) | 52 (360) | 20 |
| F56 | 68 (470) | 56 (385) | 20 |
| F60 | 75 (515) | 60 (415) | 20 |
| F65 | 77 (539) | 65 (450) | 20 |
| F70 | 82 (565) | 70 (485) | 18 |