» Technical » Supply ASTM A694 F65 flanges for Chevron Bibiyana Gas Plant project

Supply ASTM A694 F65 flanges for Chevron Bibiyana Gas Plant project

May 11, 2024

We are excited to introduce our top-quality ASTM A694 F65 flanges, supplied specifically for the Chevron Bibiyana Gas Plant project, Bangladesh. Our flanges are manufactured to meet the stringent requirements of the oil and gas industry, ensuring durability, reliability, and performance in challenging environments.

Features and Advantages

High Strength

ASTM A694 F65 flanges exhibit exceptional tensile strength and yield strength, making them suitable for applications that involve high pressure and heavy loads. The material’s robustness ensures that piping systems can operate safely and efficiently even under demanding conditions.

Superior Toughness

One of the key benefits of F65 flanges is their ability to maintain high impact toughness, even at low temperatures. This feature significantly reduces the risk of brittle fracture, ensuring the integrity of the system in cold environments where many materials may become more susceptible to failure.

Corrosion Resistance

The chemical composition and manufacturing process of F65 flanges contribute to their excellent corrosion resistance. This makes them an ideal choice for pipelines that transport corrosive fluids, extending the service life of the equipment and reducing maintenance costs.


While the initial cost of F65 flanges may be higher than some standard carbon steel flanges, their superior performance and longer service life often result in lower lifecycle costs. The reduced need for maintenance and replacement can lead to significant cost savings over time.


ASTM A694 F65 flanges are high-quality, high-strength steel flanges that undergo a quenching and tempering process, endowing them with exceptional properties. These flanges are indispensable in the oil and gas industry, particularly in pipelines that need to withstand the high pressures involved in the transportation of hydrocarbons over long distances.

In addition to their extensive use in oil and gas applications, ASTM A694 F65 flanges are also utilized in chemical plants that handle a variety of corrosive and hazardous materials. The superior corrosion resistance of these flanges is crucial in environments that are frequently exposed to corrosive media. The robustness of these flanges ensures that processing equipment remains safe and functional even when exposed to aggressive chemicals and extreme conditions.

Apart from their corrosion-resistant properties, ASTM A694 F65 flanges are meticulously designed to withstand high temperatures without compromising their structural integrity. This is especially important in refining processes where temperatures can reach high levels, leading to failure in less durable materials. The ability of ASTM A694 F65 flanges to maintain strength and dimensional stability at these temperatures makes them an ideal choice for refineries.

In the power generation sector, ASTM A694 F65 flanges can be used in facilities that operate under high-temperature and high-pressure conditions, such as boilers and turbines. This contributes to the overall reliability and efficiency of power generation systems.

The combination of high strength, corrosion resistance, and the ability to withstand high temperatures and extreme pressures makes ASTM A694 F65 flanges invaluable components in the oil and gas industry, as well as in chemical plants and power generation facilities. Their versatility and robust performance ensure that they are the preferred choice of engineers and operators who demand the highest performance and safety from their equipment.

WNRF flanges, ASME B16.5 20" Class 600 SCH 40 ASTM A694 F65

Welding neck flange, dimensions to ASME B16.5 20″ Class 600, raised face, material grade: ASTM A694 F65, supplied to Chevron Bibiyana Gas Plant project, Bangladesh.

Chemical Composition Requirements

ElementComposition, %
(Heat Analysis)
*1. Alloying elements including Cu, Ni, Cr, Mo, V, Nb and B shall be reported if any.
*2. No limits apply to above-mentioned elements of A694 forgings furnished in carbon or low alloy steel.
*3. ASTM A694 forgings furnished in alloy steel should be in conformance to ASTM A707 Grade L5.
*4. The carbon equivalent (CE) of ASTM A694 grades shall be calculated by the formula: CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15, and shall not exceed 0.42%.

Mechanical Properties

ASTM A694Yield Strength
min. MPa [ksi]
Tensile Strength
MPa [ksi]
Elongation in
2", min. %
F65450 [65]530 [77]≤20
*Tensile requirements for ASTM A694 F65 flanges.

Impact Test

During the impact test, a standard-sized specimen is subjected to a swinging pendulum that applies an abrupt load. The energy absorbed by the specimen on the fracture surface is measured, and this value is known as the impact value or impact toughness. A higher impact toughness indicates a greater ability of the material to resist fracturing under low temperatures or dynamic loading conditions.

Charpy V-notch impact test is a critical process for evaluating the toughness and resistance to fracture of ASTM A694 F65 flanges, especially in applications where high strength and durability are essential, such as in the oil and gas industry. The Charpy V-notch impact test for ASTM A694 F65 flanges are conducted in accordance with the ASTM A370 standard, which provides guidelines for the testing of metallic materials. These tests are typically performed at a specified temperature, often -46°C (-51°F), as this temperature represents a point at which the toughness of many materials significantly decreases, making them more prone to brittle fracturing.

For ASTM A694 F65 flanges, the impact test results must meet certain minimum requirements to ensure that the material maintains adequate toughness in real-world applications, preventing catastrophic failures due to brittle fracturing. These requirements are crucial for the reliability and safety of the flanges when they are used in environments subject to low temperatures and high pressures.

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