ASTM A691 is a specification that encompasses a range of electric-fusion-welded (EFW) pipes made from various grades of low-alloy and high-strength steel. These pipes are engineered to meet specific requirements in industries such as petrochemical, power generation, oil and gas, and more. The A691 specification covers a wide array of grades, each designed to address unique application needs, from corrosion resistance to high-temperature performance. These EFW pipes are known for their durability and reliability in demanding environments.
One of the key advantages of ASTM A691 alloy steel EFW pipes is their versatility in meeting a wide range of industrial demands. These pipes come in various grades and sizes, catering to different application requirements. Some grades are specially formulated for high-temperature applications, offering remarkable creep strength and resistance to thermal fatigue, while others are designed to withstand corrosive environments. The EFW manufacturing process ensures a strong and consistent bond throughout the pipe length, enhancing the overall structural integrity of the pipes.
Manufactured to stringent ASTM standards, A691 alloy steel EFW pipes are well-regarded for their quality and performance. They are used in critical infrastructure such as pipelines, boilers, heat exchangers, and more. Engineers and industries often choose ASTM A691 alloy steel EFW pipes for their durability, reliability, and adaptability to a variety of challenging operating conditions. It's essential to consult the specific grade's documentation and the ASTM A691 specification to ensure proper selection for the intended application.
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Specification:
Sizes (Seamless): Not applicable (A691 is specifically for Electric-Fusion-Welded pipes)
Sizes (ERW) : Not applicable (A691 is specifically for Electric-Fusion-Welded pipes)
Sizes (SAW/EFW) : Typically available from 16" NB (Nominal Bore) to 84" NB
Wall Thickness : Available in various schedules such as SCH 5S, 10S, 20S, 30, 40S, STD, 40, XS, 60, 80S, 80, 100, 120, 140, 160, XXS
Length : Normally supplied as Single Random Length (SRL) and Double Random Length (DRL) - Typically 16 to 22 feet, Custom lengths are also available based on specific requirements.
Chemical Properties of ASTM A691 Alloy Steel efw Pipes
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Copper (Cu) | Other Alloys |
| Typical Composition Range (% by weight) | 0.10 - 0.98 | 0.10 - 1.60 | ≤ 0.025 | ≤ 0.025 | 0.10 - 0.50 | ≤ 0.50 | Varies based on specific grade | Varies based on specific grade | Varies based on specific grade | Varies based on specific grade |
Mechanical Properties of ASTM A691 Alloy Steel efw Pipes
| Property | Tensile Strength | Yield Strength (0.2% offset) | Elongation in 2" | Hardness (Brinell) | Impact Properties |
| Typical Value | Varies based on grade | Varies based on grade | Varies based on grade | Varies based on grade | Refer to specific requirements in ASTM A691 specification |
Advantages of ASTM A691 Alloy Steel efw Pipes:
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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