ASTM A694 Flange
ASTM A694 Flange is a high-yield carbon steel flange built for high-pressure transmission in oil, gas, and petrochemical applications. In order to provide reliable performance under high temperatures and pressures these flanges are controlled heat treated, and forged for additional strength. Midland Alloys Inc. is a reputable manufacturer and global supplier of ASTM A694 Flanges, offering a wide range of types like weld neck, slip-on, blind, and orifice flanges. We produce these flanges in grades such as F42, F46, F52, F60, F65, and F70, all conforming to ASTM A694 / ASME SA694 specifications. Surface finishes include rough machined, smooth turned, and mirror polished. With high-grade carbon steel, ASTM A694 F65 flanges offer outstanding durability, corrosion resistance, and mechanical strength, making them essential for demanding industries.
Benefits of ASTM A694 Flange
ASTM A694 flanges offer a blend of mechanical strength and toughness that’s essential for high-pressure systems. These flanges offer a long service life and low maintenance, since they are made to be resilient in crucial pipelines and valve assemblies.
- Made from fine-grain carbon steel with chromium and molybdenum for added hardness and resistance to wear.
- Offers high yield strength with excellent impact resistance, ideal for stress-loaded connections.
- To improve structural uniformity and toughness, flanges are normalized or quenched and tempered.
- Manufactured as per ANSI B16.5, MSS SP-44, and API 6A standards to ensure global compatibility and fit accuracy.
- Grades like F60 and F70 support heavy-duty applications, by maintaining integrity at elevated pressure ratings.
ASTM A694 Flange Specifications
Seamless Tube OD : 1/2″ to 48″
Welded Tube OD : 6.00 mm OD up to 914.4 mm OD
EFW Tube Size : 3.35 mm OD To 101.6 mm OD
ASTM A694 / ASME SA694
Seamless / Welded / ERW / Fabricated / CDW / 100% X Ray Welded
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random, Standard & Cut length Tube
Plain End, Beveled End, Treaded Tube
SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Tubes, Finish as per customer Requirements
Contact us today to discuss how ASTM A694 Flange can benefit your application. Whether you need guidance in selecting the right Tubes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
| Grade | C | Mn | P | S | Si |
| ASTM A694 F65 Flanges | 0.26-0.265 | 1.60-1.64 | 0.025-0.030 | 0.025-0.030 | 0.15-0.35 |
| Grade | Yield Strength (0.2% Offset), ksi [MPa] | Tensile Strength, ksi [MPa] | Elongation in 2 in. or 50 mm, % |
| ASTM A694 F65 | 45 [310] | 65 [450] | 20 |
| Gr. | Yield Strength (0.2 % Offset), minimum, ksi [MPa] | Tensile Strength, minimum, ksi [MPa] | Elongation in 2 in. or 50 mm, minimum % | ||
| ASTM A694 F65 Flanges | 450 | 65 | 530 | 77 | 20 |
Carbon Steel Flanges Grades We Offer
ASTM A694 Flange vs ASTM A350 LF2 Flange
Although they are both made of carbon steel, ASTM A694 and ASTM A350 LF2 flanges have slightly different purposes. A694 is used in high-pressure transmission systems especially in gas and oil pipelines and is made to have a high yield strength. It has a greater tensile strength, and superior durability under extreme pressures. ASTM A350 LF2 is more appropriate for low-temperature applications. It is perfect for a cryogenic environment, because it has exceptional impact toughness at below-freezing temperatures. A694 generally surpasses LF2 in strength, whereas LF2 excels in ductility and shock resistance in cold environments.
Round Bar
Analytic
Cut to Length
Centering
Heating
Perforation
Inspection of Size
Pickling
Inspection of Surface
Lubricating
Cold Drawing (Cold Rolling)
Degreasing
Annealing
Straightening
Cut
Pickling / Passivating
Inspection
Analytic
Marking
Packing & Shipping
Applications of ASTM A694 Flange
ASTM A694 Flanges play a vital role in industries that demand strong, high-pressure connections. In the oil and gas sector, they are used in transmission lines, offshore platforms, and refinery systems. They are used in power plants’ heat exchangers and high-temperature steam lines because of their durability and tolerance to heat. In the petrochemical industry, they handle aggressive chemicals and heavy fluids, while maintaining mechanical integrity. Water treatment plants use it to transport treated and untreated water safely, as they resist corrosion and stop leaks.
Why Choose Midland Alloys Inc. for ASTM A694 Flange
We follow ASTM A694 / ASME SA694 standards and operate under ISO-certified systems to ensure product quality and reliability. Depending on the requirements of the project, our flanges have unique end finishes, dimensions, surface treatments, and non-standard schedules. We export across the Gulf, Europe, Africa, and Southeast Asia, maintaining a strong reputation as a reliable supplier. Every product undergoes in-house testing, includes mill certificates, and can be inspected by third-party agencies on request. Whether for small batches or bulk exports we guarantee timely delivery, expert project coordination, and long-term support.
FAQs
ASTM A694 flanges are typically available in pressure classes ranging from 150 to 2500, depending on the flange type and size.
Yes, If ASTM A694 flanges meet NACE MR0175/ISO 15156 specifications, they can be utilized in sour service.
Yes, ASTM A694 flanges are weldable, especially when using compatible filler materials and following preheat and post-weld heat treatment (PWHT) protocols appropriate for the carbon steel grade involved.
