Carbon Steel ASTM A694 Flanges
High Yield Carbon Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service
SSM Provides ASTM A694 Carbon Steel Flanges
SSM supplies high-quality carbon steel ASTM A694 flanges, designed for high-pressure pipeline transmission systems in oil & gas, petrochemical, offshore, and onshore projects.
ASTM A694 flanges are high-yield forged carbon steel flanges engineered for demanding service conditions where standard carbon steel (such as ASTM A105) is not sufficient.
What Are ASTM A694 Flanges?
ASTM A694 flanges are forged carbon steel flanges designed for:
- High-pressure transmission pipelines
- Long-distance oil & gas pipelines
- Offshore platforms
- Compressor and pump stations
- Pipeline valve assemblies
They are widely used in combination with API pipeline steels such as API 5L X52–X70.
ASTM A694 Chemical Composition & Mechanical Properties
ASTM A694 is a strength-grade-based specification (F42–F70) rather than a fixed chemical composition grade. The chemical composition is controlled to ensure strength, toughness, and weldability.
Typical Chemical Composition
| Element | Content (%) |
| Carbon (C) | ≤ 0.30 |
| Manganese (Mn) | 0.60 – 1.60 |
| Silicon (Si) | ≤ 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Nickel (Ni) | ≤ 0.40 (when specified) |
| Chromium (Cr) | ≤ 0.30 (when specified) |
| Molybdenum (Mo) | ≤ 0.15 (when specified) |
Key Notes
- ASTM A694 is designed for high yield strength, not corrosion resistance
- It is a low-carbon, micro-alloyed steel system
- Optimized for:
- High strength
- Good toughness
- Weldability
- Pipeline service performance
The key feature of ASTM A694 is its yield strength classification (F42–F70).
Mechanical Properties by Grade
| Grade | Minimum Yield Strength | Minimum Tensile Strength | Typical Pipeline Grade |
| F42 | 290 MPa (42 ksi) | 415 MPa (60 ksi) | API 5L X42 |
| F46 | 315 MPa (46 ksi) | 435 MPa (63 ksi) | API 5L X46 |
| F52 | 360 MPa (52 ksi) | 455 MPa (66 ksi) | API 5L X52 |
| F56 | 385 MPa (56 ksi) | 490 MPa (71 ksi) | API 5L X56 |
| F60 | 415 MPa (60 ksi) | 520 MPa (75 ksi) | API 5L X60 |
| F65 | 450 MPa (65 ksi) | 535 MPa (78 ksi) | API 5L X65 |
| F70 | 485 MPa (70 ksi) | 570 MPa (83 ksi) | API 5L X70 |
Key Mechanical Characteristics
High Strength Steel
- Much higher yield strength than ASTM A105
- Designed for high-pressure pipeline systems
Excellent Toughness
- Suitable for low-temperature service
- Good impact resistance
Pipeline Compatibility
Typically used with:
- API 5L X42–X70 pipes
- MSS SP-75 WPHY fittings
- ASME B16.5 / B16.47 flanges
Heat Treatment Condition
ASTM A694 forgings are typically:
- Normalized
- Quenched & tempered (for higher grades like F65/F70)
One-Stop ASTM A694 Flanges Provider for All Your Needs
SSM has significant product advantages in manufacturing ASTM A694 Flanges. Whether it’s quality or price, we will meet your needs.
Comparison with A105 (Important for customers)
| Property | A105 | A694 |
| Strength | Standard | High yield |
| Application | Process piping | Transmission pipelines |
| Pipe system | A106 / A53 | API 5L |
| Pressure class | ASME B16.5 | API / pipeline flanges |
| Cost | Lower | Higher |
Why Choose SSMALLOYS?
SSM provides:
- Full range of ASTM A694 F42–F70 flanges
- EN 10204 3.1 / 3.2 certification
- NACE MR0175 / sour service options
- PMI, UT, PT, hardness testing
- Export-ready packaging for global projects
FAQs About ASTM A694 Flanges
Yes, depending on grade and heat treatment, ASTM A694 flanges can be used in low-temperature environments, especially when impact testing requirements are met.
However, for extreme low-temperature service, ASTM A350 LF2 is often preferred.
No. ASTM A694 is a carbon steel material, not stainless steel.
It requires protection such as:
- Painting
- Anti-corrosion coating
- Hot-dip galvanizing (in some cases)
- Proper storage and preservation
ASTM A694 is used for forged components (flanges, fittings), while API 5L is used for line pipe.
They are often used together in pipeline systems.
Request a Quote
Whether you need standard carbon steel flanges, butt-weld fittings, or a complete piping package for your oil, gas, or chemical project, SSMALLOYS is your reliable manufacturing partner. Contact us today for competitive pricing, technical support, and fast global delivery.
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